POWER SUPPLY SYSTEM, POWER TRANSMITTER, AND POWER RECEIVER
Technical Field
[0001] The present application relates to a power supply
system, and in particular, it relates to the power supply system
capable of wirelessly supplying power from a power transmitter
to a power receiver.
Background Art
[0002] Well-known wireless power supply technologies
include power supplies based on electromagnetic induction and
power supplies based on radio waves. On the other hand,
recently, power supplies based on magnetic resonance have been
proposed.
[0003] In a wireless power supply system based on magnetic
resonance, for example, resonant coils having certain resonant
frequencies are arranged in a power transmitting device, and
resonant coils having the same resonant frequencies as those
of the power transmitting device are arranged in a power
receiving device. A coupling of a magnetic field which realizes
an electromagnetic energy transfer by the magnetic resonance
is formed between the power transmitting device and the power
receiving device, and the power is efficiently transmitted
wirelessly from the resonant coils of the power transmitting
device to the resonant coils of the power receiving device by
the coupling of a magnetic field.
[0004] It is considered that, compared with a power supply
system based on radio waves, a power supply system based on
magnetic resonance is capable of supplying a larger amount of
power, elongating a power transmission distance, and reducing
a size of the coil for power transmission.
[0005] A certain well-known non-contact power supply
device embodies a power supply stand which includes a first coil,
a power supply, power supply controlling equipment, and a supply
commanding unit, and which is installed on the ground. A second

coil, a charge controlling circuit, and a battery are loaded
on a vehicle. In charging the battery, the vehicle is made to
stop in such a way that the second coil is located immediately
above the first coil, a controlling signal is output to the power
supply from the power supply controlling equipment by an
operation of the supply commanding unit, and an alternating
excitation current is supplied to the first coil from the power
supply, which generates an induced magnetic flux. An
alternating induced electromotive force induced in the second
coil by this induced magnetic flux is converted into a direct
current by the charge controlling circuit, the obtained direct
current is supplied to the battery, and the battery is thereby
charged. A control displaying unit calculates and displays the
supplied power amounts and charges or wirelessly transmits
them.
[0006] In a certain well-known power supply system, an ECU
(electronic control unit) of the vehicle which transmits power
executes a program which includes a step of wirelessly
transmitting power to the vehicle which receives power. The
ECU of the vehicle which receives power, when it receives power
transmitted from°the vehicle which transmits power, supplies
the received power to a driving motor, and executes a program
which includes a step of driving a driving motor. With this,
when the vehicle is traveling, power transmission and reception
are available. The power supply system calculates fees on the
basis of the transmitted power and/or received power.
[0007] A certain well-known power transmitting device
senses an approach of a portable electronic apparatus having
a high-speed large-capacity storage module which functions as
a rechargeable power supply, and transmits power to charge the
high-speed large-capacity storage module in response to the
sensed approach. With this, the power source is rechargeable
at a time of, for example, a noncontact authentication
processing operation, by approximation to the authentication
device. A charging system performs a charging fee process in

accordance with an amount of charge.
[0008] Patent Document 1: Japanese Laid-open Patent
Publication 8-237890
Patent Document 2: Japanese Laid-open Patent Publication
2005-168085
Patent Document 3: Japanese Laid-open Patent Publication
2006-353042
Disclosure of Invention
[0009] The inventors have recognized a need for wirelessly
transmitting power from the power transmitter to the power
receiver on the basis of a predetermined power transmitting
condition and a predetermined power receiving condition, for
collecting information such as information of a power
transmission amount in the power transmitter, a power reception
amount in the power receiver, and the like, and for
appropriately charging fees with respect to the power reception
amount in the power receiver on the basis of the information.
[0010] An object of the embodiments of the present
invention is to realize a wireless power transmission from the
power transmitter to the power receiver on the basis of the power
transmitting condition and the power receiving condition.
Another object of the embodiments is to be able to
determine the fees charged on the basis of the power
transmission amount and/or the power reception amount when a
wireless power transmission is performed from the power
transmitter to the power receiver.
Still another object of the embodiments is to be able to
determine the fee to the power reception amount of each power
receiver on the basis of the power transmission amount and/or
the power reception amount when the wireless power transmission
is performed from the power transmitter to a plurality of power
receivers.
[0011] According to one aspect of the embodiment of the
present invention, the power supply system includes at least

one power transmitter, at least one power receiver, and an
information processing device. The at least one power
transmitter transmits first identification information and a
power transmitting condition to a power receiver, receives
second identification information and a power receiving
condition from the power receiver, wirelessly transmits power
to the power receiver on the basis of the power transmitting
condition and the power receiving condition, and generates
power transmission amount information which indicates a power
amount wirelessly transmitted to the power receiver. The at
least one power receiver receives the first identification
information and the power transmitting condition from the
corresponding power transmitter, transmits the second
identification information and the power receiving condition
to the corresponding power transmitter, wirelessly receives
power from the corresponding power transmitter on the basis of
the power transmitting condition and the power receiving
condition, generates the power reception amount information
which indicates the power amount wirelessly received, and
transmits the first identification information, the second
identification information, and the power reception amount
information via a network. The information processing device
manages the power transmission amount information and the power
reception amount information via a wireless power feeding of
a contractor, receives the first identification information,
the second identification information, and the power
transmission amount information via a network, and receives the
second identification information and the power reception
amount information via a network.
[0012] According to one aspect of the embodiments of the
present invention, the wireless power transmission from the
power transmitter to the power receiver on the basis of the power
transmission and power receiving conditions may be realized,
the fees may be determined on the basis of the power transmission
amount and/or the power reception amount when the wireless power

transmission is performed from the power transmitter to the
power receiver, and the fees to the power reception amount of
each power receiver on the basis of the power transmission
amount and/or the power reception amount may be determined when
the wireless power transmission is performed from a power
transmitter to a plurality of power receivers.
Brief Description of Drawings
[0013] Fig. 1 illustrates one example of a schematic
configuration of the power supply system for wireless power
supply and charging fees according to one embodiment.
Fig. 2 illustrates another example of a schematic
configuration of the power supply system for wireless power
supply and charging fees according to another embodiment.
Fig. 3 illustrates one example of a schematic
configuration of each power transmitter of Figs. 1 and 2.
Fig. 4 illustrates one example of a schematic
configuration of each power receiver of Figs. 1 and 2.
Figs. 5A and 5B respectively illustrate one example of
a contractor information management server in Figs. 1 and 2,
and a processing and a communication procedure for a power
supply between a plural set of communication devices as well
as the power transmitter and the power receivers.
Figs. 6A and 6B respectively illustrate one example of
a processing and communication procedure for a power supply
between the power transmitter and the power receiver after the
procedure of Fig. 5A and before the procedure of Fig. 5B.
Figs. 7A and 7B respectively illustrate another example
of a processing and communication procedure for the power supply
between the power transmitter and the power receiver after the
procedure of Fig. 5A and before the procedure of Fig. 5B.
Fig. 8 illustrates one example of a change in a power
transmission efficiency with respect to a power transmission
distance from the power transmitter to the power receiver, and
a calculation method of power fees for the power reception

amount on the basis of the power transmission efficiency,
performed by the contractor information management server.
Figs. 9A and 9B respectively illustrate one example of
a change in the power transmission efficiency of different power
transmitting resonant frequencies and of different power
receiving resonant frequencies to the power transmission
distance D
Fig. 10 illustrates one example of a power transmission
procedure when transmitting power to any of the power receivers
which simultaneously receives power from one power transmitter,
in accordance with the procedures of Figs. 6A and 6B or Figs.
7A and 7B, in Fig. 1 or 2.
Fig. 11 illustrates another example of a power
transmission procedure when transmitting power to two power
receivers which simultaneously receives power from one power
transmitter, in accordance with the procedures of Figs. 7A and
7B, in Fig. 1 or 2.
Figs. 12A to 12C respectively illustrate another example
of a power transmission procedure when transmitting
simultaneously power to any of the power receivers from one or
two out of the plurality of power transmitters, in accordance
with the procedures of Figs. 6A and 6B, in Fig. 2.
Best Mode for Carrying Out the Invention
[0014] The object and the advantages of the invention will
be realized and attained by means of the elements and
combinations particularly pointed out in the claims.
It is to be understood that both the foregoing general
description and the following detailed description are
exemplary and explanatory and are not restrictive of the
invention.
[0015] The nonrestrictive embodiments of the present
invention are explained referring to drawings. In the drawings,
the same components and elements are allotted the same reference
numerals.

[0016] Fig. 1 illustrates one example of a schematic
configuration of a power supply system 20 for a wireless power
supply and charging fees according to one embodiment.
Fig. 2 illustrates an example of a schematic
configuration of another power supply system 22 for a wireless
power supply and charging fees according to another embodiment.
[0017] In Fig. 1, the power supply system 20 includes a
contractor information management server 100 of power suppliers,
e.g., electric power companies, power meters 202 and 302
provided in the power supplying facilities or homes of each of
the contractors a and b with respect to power use, communication
devices 204, 304 and power transmitters 210 and 310. In Fig.
1, the letters a and b represent each of the contractors with
respect to power use related to the power meters 202 and 302,
power transmitters 210 and 310, or power receivers 230 and 330.
Power contractors or power consumers a and b are capable of
transmitting power from the power transmitters 210 and 310 to
the power receivers 230 and 330 in the power supplying
facilities or homes by a wireless power supply system. The
power receivers 230 and 330 are capable of receiving power from
the power transmitter 310 by a wireless power supply system at
different time periods or in parallel simultaneously. The
power transmitters 210 and 310 are capable of transmitting power
to the power receivers 230 and 330 by a wireless power supply
system at different time periods or in parallel simultaneously
[0018] The contractor information management server 100
is an information processing device and includes a processor
102, a storage device 104 which stores a database (DB) 106, and
a network interface (NW/IF). The processor 102 executes
processing for realizing a function of a charging fee processing
system in accordance with a program stored in the storage device
104.
[0019] The power receivers 230 and 330 are capable of
supplying power to devices 260 and 360, which are coupled
thereto, respectively. The devices 260 and 360 may include a

charging circuit and a rechargeable battery. The devices 260
and 360 may be home electrical appliances such as, for example,
a television device, an audio device, a radio, a refrigerator,
an air-conditioner, a washing machine, an iron, a facsimile
machine, or a telephone set. In addition, the devices 260 and
360 may be information equipment such as, for example, a PHS
telephone, a cordless handset, a portable wireless transceiver,
a portable personal computer, a hand-held personal computer,
a palm size personal computer, a portable information terminal,
a PDA, a hand-held gaming device, and the like. Further, the
devices 260 and 360 may be an electric automobile or an electric
motorcycle.
[0020] In Fig. 1, a power supplier of the contractor
information management server 100 transmits power from an
electric generation plant by a transmission line 40, and
supplies power to the line of the power supply facilities in
the home of each of the contractors a and b via the power meters
202 and 302 connected to the transmission line 40 (1) . The power
meters 202 and 302 periodically or regularly supply the measured
total power supply amount or meter values to the communication
devices 204 and 304 (2) . On the other hand, power is supplied
from the power meters 202 and 302 to the power transmitters 210
and 310, or other electric appliances, via the line of the power
supplying facility of the contractors a and b (3).
[0021] The power transmitters 210 and 310 exchange
information concerning the identification information (ID) of
each of the contractors a and b, and of the power receivers 230
and 330, the power transmitting condition, the power receiving
condition, and the like by a wireless communication between the
power receivers 230 and 330 (4 to 8) . Subsequently, the power
transmitters 210 and 310 transmit power by a wireless power
supply system to the power receivers 230 and 330 on the basis
of the power transmitting condition and the power receiving
condition between the power receivers 230 and 330, while
transmitting, receiving, and monitoring the power transmitting

state and the power receiving state wirelessly (4 to 15) . The
wireless communication between the power transmitters 210 and
310, and the power receivers 230 and 330, may comply with a near
field wireless communication standard such as a blue tooth
standard (IEEE208.11a/b/c) or a wireless LAN standard
(IEEE802.15).
[0022] Further, the power receiver 230 of the contractor
a may exchange identification information (ID) and information
of the power transmitting condition and the power receiving
condition wirelessly between the power transmitter 310 of other
contractor b, and may receive power from the power transmitter
310 by a wireless power supply system, while transmitting,
receiving, and monitoring the power transmission and reception
states wirelessly {4' to 15'). The power transmission by the
power transmitters 210 and 310 to the power receiver 230 may
be performed in parallel simultaneously during a certain time
period. Further, the power reception from the power
transmitter 310 by the power receivers 230 and 330 may be
performed in parallel simultaneously during a certain time
period.
[0023] The power transmitters 210 and 310, when the power
transmission is completed, supply the power transmission
information to the communication devices 204 and 304 (16) . The
power transmission information includes, for example,
identification information of the contractors a and b of the
power transmitters 210 and 310, the identification information
of the contractors a and b of the power receivers 230 and 330,
a start-up time and a completion time of the power transmission,
a start-up time and a completion time of the simultaneous power
transmission, the applied power transmitting condition and the
applied power receiving condition in each time period, the power
transmission state and the power reception state, and
information of the power transmission amount (data) . The power
transmission information may include information of the power
reception amount (data) in the power receivers 230 and 330. The

communication devices 204 and 304 store the identification
information of the contractors a and b of the power meters 202
and 302, a total power supply amount or a meter value, the power
transmission information of the power transmitters 210 and 310,
and the like in the memory (not illustrated) . The communication
devices 204 and 304 transmit the identification information of
the contractors a and b, a total power supply amount, the power
transmission information, and the like, to the contractor
information management server 100 of the power supplier via a
network 50 (17).
[0024] On the other hand, the power receivers 230 and 330,
when the power reception is completed, transmit the power
reception information to the contractor information management
server 100 of the power supplier via a wireless base station
(AP) 52 on, for example, a wireless communication channel of
a mobile communication network (18). The power reception
information includes, for example, the identification
information of the contractors a and b of the power receivers
230 and 330, the identification information of the contractors
a and b of the power transmitters 210 and 310, the start-up time
and completion time of the power reception, the start-up time
and completion time of the simultaneous power reception, the
applied power transmitting condition and power receiving
condition in each time period, the power transmission and power
reception states, the power reception amount, and the like. The
mobile communication network may comply with standards such as,
for example, a PHS (Personal Handy-phone System), a PDC
{Personal Digital Cellular) for the 2nd-generation mobile phone
communication, an IS-95B (CdmaOne) for the 2. 5th-generation
mobile phone communication, an IMT2000(HSDPA (High Speed
Downlink Packet Access)) for the 3rd-generation mobile phone
communication, and the like. The wireless base station 52
transmits the power reception information to the contractor
information management server 100 via a network 50 which
includes, for example, a public switched telephone network

(PSTN) and/or a packet switched data network (PSDN), an ISDN
(Integrated Services Digital Network) or an Internet, and the
like (19). The network 50 which transmits the power reception
information, however, may be a network which is different from
the network 50 which transmits the power transmission
information.
[0025] The contractor information management server 100
calculates the fees of the power for the power amount received
by the power receivers 230 and 330 on the basis of the received
identification information of the contractors a and b, the power
transmission and reception information, the contract
information of the contractors a and b of the data base 106,
and charges the fees to the contractors a and b (20).
[0026] In Fig. 2, the power supply system 22 includes the
contractor information management server 100 of power suppliers,
power meters 202, 302, and 4 02, communication devices 204, 304,
and 404, and power transmitters 210, 310, and 410, provided in
power supplying facilities or homes of each contractor. In Fig.
2, letters xl represent contractors with respect to power use
related to the power meters 202, 302, and 402, or power
transmitters 210,"310, and 410, and the letters a, b, and c
represent each contractor with respect to power use related to
the power receivers 230, 330, and 430. The power contractors
or power consumers a, b, and c related to the power reception,
in the power supply facility which may be shared for the
contractor* l related to the power transmission, are capable
of receiving power from the power transmitters, respectively
by the power receivers 230, 330, and 430 by a wireless power
supply system in the respective different time periods or in
parallel simultaneously. In addition, the power transmitters
210, 310, and 410 may transmit power to any of the power receivers
230, 330, and 430 by a wireless power supply system in the
respective different time periods or in parallel
simultaneously.
[0027] The power transmitter 210, for example, exchanges

between the power receivers 230, 330, and 430 the identification
information (ID) of the contractors x1, a, b, and c, and the
information of the power transmitting condition and the power
receiving condition, and the like, by a wireless communication
(4 to 8). Subsequently, the power transmitter 210 transmits
power by a wireless power supply system to the power receivers
230, 330, and 430 on the basis of the power transmitting
condition and the power receiving condition, while transmitting
and receiving, and monitoring, the power transmission and power
reception states between the power receivers 230, 330, and 430
(9 to 15).
[0028] The power transmitter 210, after the power
transmission is completed, supplies the power transmission
information to the communication device 204 (16). The power
transmission information includes, for example, the
identification information of the contractor xl of the power
transmitter 210, the identification information of the
contractors a, b, and c of the power receivers 230, 330, and
430, information of a start-up time and completion time for the
power transmission, information of a start-up time and a
completion time of the simultaneous power reception ' by a
plurality of power receivers in response to the power
transmission, information of the applied power transmitting
condition and applied power receiving condition in each time
period, information of the power transmission and power
reception states, and information of the power reception amount.
The power transmission information may include information of
the power reception amount in the power receivers 230, 330, and
430, and information of a start-up time and a completion time
of the simultaneous power transmission by a plurality of power
transmitters. The communication device 204 stores the
identification information of the contractor xl, the total
amount of the power supply or the meter values, the power
transmission information, and the like in the memory (not
illustrated). The communication device 204 transmits the

identification information of the contractor x1, the total
amount of the power supplied, the power transmission
information, and the like to the contractor information
management server 100 of the power suppliers via a network 50
(17) .
[0029] On the other hand, the power receivers 230, 330,
and 430, after the power reception is completed, transmit the
power reception information to the contractor information
management server 100 via the wireless base station (AP) 52,
for example, on a wireless communication line of the mobile
communication network or on a channel (18) . The power reception
information includes, for example, the identification
information of the contractor x1 of the power transmitter 210,
the identification information of the contractors a, b, and c
of the power receivers 230, 330, and 430, a start-up time and
a completion time for the power reception, a start-up time and
a completion time of the simultaneous power transmission by a
plurality of the power transmitters, the power transmitting
condition and the power receiving condition in each time period,
the power transmission and the power reception states, and the
power reception amount, and the like. The wireless base station
52 transmits the power reception information to the contractor
information management server 100 via a network 50 (19) . The
network 50 which transmits the received power information,
however, may be a different network from the network 50 which
transmits the power transmission information. The other
operations and procedures of the system 22 in Fig. 2 are the
same as those of the system 20 in Fig. 1.
[0030] Fig. 3 illustrates an example of the schematic
configuration of the respective power transmitters 210, 310,
and 410 in Figs. 1 and 2.
[0031] Each of the power transmitters 210, 310, and 410
includes a controlling unit 212, a memory or a storage unit 213,
a modulating unit or oscillating unit (MOD) 214, an amplifier
215, a power transmitting unit 220, and a temperature sensor

228. Each of the power transmitters 210, 310, and 410 further
includes an operation key 216, a displaying unit 217, a
transceiver (TX/RX) 218 for a near field wireless communication,
and an interface (I/F) 219. The controlling unit 212 is
connected to the elements 213 to 220, and 228, supplies control
signals to the elements 213 to 220, and 228, and transmits and
receives information and data between the elements 213 to 220,
and 228. The controlling unit 212 may be a processor for
exclusive use, or a processor such as a microprocessor or a
microcomputer which operates with the program stored in the
memory 213.
[0032] A power transmitting unit 220 includes a power
supplying unit or a circuit 222 for power transmission, and a
power transmitting resonant coil 226. The power supplying unit
222 in the power transmitting unit 220 is connected to a
modulating unit 214 via an amplifier 215, and preferably
includes a power supplying coil or an electromagnetic induction
coil 224. The modulating unit 214 is connected to a DC power
source or an AC power source coupled to an electrical
interconnection of the power supplying facilities of
contractors a, b, and x1.
[0033] The transceiver 218 is a transceiver which complies
Kith a near field wireless communication standard such as a blue
tooth standard or a wireless LAN standard, and wirelessly
communicates with the power receivers 230, 330, and 430. The
interface 219 forms an interface between the communication
devices 204 and 304.
[0034] The memory 213 stores the power transmission
information of the identification information of the
contractors a, b, and x1 of the power transmitters 210, 310,
and 410, the identification information of the power
transmitters 210, 310, and 410, the identification information
of the contractors a, b, and c of the power receivers 230, 330,
and 430, and the identification information of the power
receivers 230, 330, and 430. In addition, the memory 213 is

capable of storing such power transmission information as a
start-up time and a completion time of the power transmission,
a start-up time and a completion time of the simultaneous power
reception by a plurality of the power receivers in response to
the power transmission, the power transmitting condition and
the power receiving condition in each time period, the power
transmission and power reception states, the power transmission
amount, the power reception amount, and the like, and other
information. The communication devices 204, 304, and 404 are
Capable of acquiring the identification information of the
contractors a, b, and x1, and the identification information
of the power transmitters 210, 310, and 410 from the power meters
202 and 302, the power transmitters 210, 310, and 410 (a memory
213), and /or their own memory.
[0035] The controlling unit 212 detects a presence and an
absence of the power receivers 230, 330, or 430, and
authenticates them by regularly transmitting inquiry signals
and by receiving the responses via the transceiver 218. The
controlling unit 212 further transmits and receives the power
transmitting condition and the power receiving condition
between the power receivers 230, 330, and 430 via the
transceiver 218, and on the basis of the power transmitting
condition and the power receiving condition, controls the
modulating unit 214, the amplifier 215, and the power
transmitting unit 220 in such a way as to transmit power by a
wireless power transmission system to the power receivers 230,
330, and 430.
The controlling unit 212 periodically acquires a
temperature of the temperature sensor 228 which detects the
temperature of the power transmitting resonant coil 22 6 and
judges whether or not the temperature exceeds a threshold value,
or in other words, the controlling unit 212 judges whether the
temperature is normal or abnormal. When the temperature
indicates an abnormality via an exceeded threshold value, the
controlling unit 212 may judge that it needs to stop power

transmission; it may raise an alert by the displaying unit 217
and stopping the operations of the modulating unit 214, the
amplifier 215, and the power transmitting unit 220. The
temperature sensor 228 may be, for example, a temperature
detector which uses thermocouple and voltage measurement.
The displaying unit 217 includes a display and/or a
speaker. The controlling unit 22 displays a power supply state
of the power transmitting resonant coil 226 visibly or audibly
to the displaying unit 217. The power supply state may be, for
example, during the authentication in the controlling unit 22,
during the establishment of communication of the transceiver
218, the establishment of communication, the preparation
completed state of the power transmission by the power
transmitting unit 220, non-power transmitting state, power
transmitting state, abnormality, alert, normality, or the
completion of power transmission.
[0036] The controlling unit 212 detects the power voltage
and current supplied to the power transmitting unit 220 using
a voltmeter (V) and an ammeter (I) connected to the power
transmitting unit 220 and measures the power, obtains the power
amount by integrating the power with respect to time, and stores
it in the memory 213. The controlling unit 212 supplies the
power transmission information to the communication devices 204
and 304 via the interface 219.
[0037] Fig. 4 illustrates an example of the schematic
configuration of the respective power receivers 230, 330, and
430 in Figs. 1 and 2.
[0038] Each of the power receivers 230, 330, and 430
includes a controlling unit 232, a memory or a storage unit 233,
a rectification unit 235, a power receiving unit 240, and a
temperature sensor 248. Each of the power receivers 230, 330,
and 430 further includes an operation key 236, a displaying unit
237, a transceiver (TX/RX) 238 for a near field wireless
communication, a transceiver (TX/RX) 239 for a mobile
communication, and a power receiving unit 240. The controlling

unit 232 is connected to the elements 233 to 240, supplies
signals to the elements 233 to 240, and transmits and receives
information and data between the elements 233 to 240. The
controlling unit 232 may be a processor for exclusive use, or
a processor such as a microprocessor or a microcomputer which
operates with the program stored in the memory 233.
[0039] A power receiving unit 240 includes a power
receiving resonant coil 246 and a power fetching unit or a
circuit 242 for fetching power. In the power receiving unit
240, the power fetching unit 242 preferably includes a power
fetching coil or an electromagnetic induction coil for fetching
power from the power receiving resonant coil 246, and supplies
the power fetched from the power receiving resonant coil 246
to the rectification unit 235 as an alternating current. The
rectification unit 235 may include a rectifier and a smoother.
The rectification unit 235 is connected to the devices 260, 360,
or 460 which use or consume power.
[0040] The devices 260, 360, or 460 include an electric
circuit for realizing each function, and further, the devices
260, 360, or 460 may include a charging circuit 262 and a charging
battery 264. The rectification unit 235 is connected to the
charging circuit 262 and/or the electric circuit of the devices
260, 360, or 460. The charging circuit 262 supplies a DC voltage
to the charging battery 264. The charging battery 264 supplies
the DC voltage to the electric circuit.
[0041] The transceiver 218 is a transceiver which complies
with a near field wireless communication standard such as a blue
tooth standard or a wireless LAN standard, and wirelessly
communicates with the power transmitters 210, 310, and 410 . The
transceiver 239 wirelessly communicates with the wireless base
station 52.
[0042] The memory 313 stores the power transmission
information of the identification information of the
contractors a, b, and c of the power receivers 230, 330, and
430, the identification information of the power receivers 230,

330, and 430, the identification information of the contractors
a, b, and x1 of the power transmitters 210, 310, and 410, and
the identification information of the power transmitters 210,
310, and 410. In addition, the memory 313 is capable of storing
such power transmission information as a start-up time and a
completion time of the power transmission, a start-up time and
a completion time of the simultaneous power reception by a
plurality of the power receivers, the power transmitting
condition and the power receiving condition in each time period,
the power transmission and power reception states, the power
transmission amount, the power reception amount, and the like,
and other information.
[0043] The controlling unit 232 receives inquiry signals
which include identification information from the power
transmitters 210, 310, or 410 via the transceiver, 238, and
transmits a response which includes the identification
information of the power receivers 230, 330, and 430 to the power
transmitters 210, 310, and 410, and authenticates them. The
controlling unit 232 transmits and receives the power
transmitting condition and the power receiving condition with
the power transmitters 210, 310, and 410 via the transceiver
238, and on the basis of the power transmitting condition and
the power receiving condition, controls the power receiving
unit 240 and the rectification unit 235 in such a way as to
receive power from the power transmitters 210 and 310 in a
wireless power transmission system.
The controlling unit 232 periodically acquires a
temperature of the temperature sensor 248 which detects the
temperature of the power receiving resonant coil 246 and judges
whether or not the temperature exceeds a threshold value, or
in other words, the controlling unit 232 judges whether the
temperature is normal or abnormal. When the temperature
indicates an abnormality via an exceeded threshold value, the
controlling unit 232 may judge that it needs to stop power
transmission, and it may raise an alert with the displaying unit

237 and stop the operations of the rectification unit 235 and
the power receiving unit 240. The temperature sensor 248 may
be, for example, a temperature detector which uses thermocouple
and voltage measurement.
The displaying unit 237 includes a display and/or a
speaker. The controlling unit 232 displays a power supply state
of the power receiving resonant coil 246 visibly or audibly to
the displaying unit 237. The power supply state may be, for
example, the preparation completed state of the reception by
the transceiver 238, in the middle of establishment of the
communication, after the establishment of the communication,
the preparation completed stated of the power reception by the
power receiving unit 240, a non-power receiving state, a power
receiving state, or a state of abnormality, alert, normality,
or the completion of power reception.
[0044] The controlling unit 232 detects the power voltage
(V) and current (I) supplied from the power receiving unit 240
using a voltmeter (V) and an ammeter (I) connected to the power
receiving unit 240 and measures the power, obtains the power
amount by integrating the power with respect to time, and stores
it in the memory 233. The controlling unit 232 supplies the
power reception information to the transceiver 239. The
transceiver 239 transmits the power reception information to
the contractor information management server 100 via a wireless
base station (AP) 52 on a wireless communication line or a
channel.
[0045] In Figs. 3 and 4, a magnetic field coupling via a
magnetic resonance or a coupled magnetic field 30 is formed
between the power transmitting resonant coil 226 and the power
receiving resonant coil 246 in a predetermined distance range.
The resonant frequency ft of the power transmitting resonant
coil 226 and the resonant frequency fr of the power receiving
resonant coil 246 are the same or substantially the same. The
power transmitting resonant coil 226 is capable of transmitting
electromagnetic energy or power to the power receiving resonant

coil 246 by a coupling of the magnetic resonance. The coupling
of the magnetic resonance is more effective even when the
distance between the power transmitting resonant coil 226 and
the power receiving resonant coil 246 is longer than the
distance which generates electromagnetic induction.
[0046] The range in which the resonant frequencies ft and
fr are substantially the same may be within a frequency range
to achieve a higher transmission efficiency than
electromagnetic induction, and for example, it may be within
a frequency range in which a Q value of a resonance point becomes
half the value of the maximum value.
[0047] The power transmitting resonant coil 226 may be,
for example, a helical type coil with a diameter of 5 to 20cm
formed of copper. The power receiving resonant coil 246 may
be, for example, a helical type coil in which a wound shape with
a maximum diameter of 1 to 4cm formed of copper is circular,
oblong, or quadrangular (rectangular). The distance between
the power transmitting resonant coil 226 and the power receiving
resonant coil 246 may be, for example, 2 to 40cm. The resonant
frequencies ft and fr may be, for example, 5 to 20MHz.
[0048] The power transmitting resonant coil 226 and the
power receiving resonant coil 246 are each formed, for example,
of one coil and have an inductance L and a capacitance C which
satisfies a resonance condition. The capacitance C may be
formed of a floating capacitance of the power transmitting
resonant coil 226 or the power receiving resonant coil 246. The
capacitance C may be adjusted by the capacitance of a capacitor
which is coupled to the power transmitting resonant coil 226
or the power receiving resonant coil 24 6. The resonant
frequency ft of the power transmitting resonant coil 226 and
the resonant frequency fr of the power receiving resonant coil
246 may be selected or changed by adjusting the inductance L
and the capacitance C.
[0049] A respective impedance Z of the power transmitting
resonant coil 226 and the power receiving resonant coil 246 is

represented by the following formula.
Z=R+i (ωL-1/ωC)
Here, R represents a combined resistance of an internal
resistance of the power transmitting resonant coil 226 or the
power receiving resonant coil 246 and/or an internal resistance
of the capacitor, and ω represents an angular frequency or an
angular speed.
[0050] A respective LC resonant frequency f (Hz)= ω/2n of
the power transmitting resonant coil 226 and the power receiving
resonant coil 246 is represented by the following formula.
f=l/(2π(LC)1/2)
[0051] In order to increase the Q value (=1/Rx ( (L/C)1/2) , .
the power supplying unit 222 may be configured not to be directly
connected to the power transmitting resonant coil 226. The Q
value, which represents sharpness of the resonance, is
determined by the resistance of the coil and of the capacitor
and the radiation resistance, and the smaller combined
resistance value R of these resistances has a larger Q value.
[0052] When the power transmitting resonant coil 226 and
the power receiving resonant coil 246 which satisfy the
resonance condition (ft=fr) are approximated, the power
receiving resonant coil 246 resonates in the magnetic field 30
formed by the power transmitting resonant coil 226 and generates
an alternating current.
[0053] In the power transmitting unit 220, the modulating
unit 214 and the amplifier 215 supply power to the power
supplying coil 224. The modulating unit 214 and the amplifier
215 supply power either directly or indirectly to the power
supplying coil 224 with, for example, a resonant frequency ft
for magnetic resonance. The frequency of the modulating unit
214 may be different from the resonant frequency ft of the power
transmitting resonant coil 226.
[0054] The power supplying coil 224 may supply power
supplied from the modulating unit 214 and the amplifier 215 to
the power transmitting resonant coil 226 by the electromagnetic

induction. In this case, the power transmitting resonant coil
22 6 and the power supplying coil 224 are located at a
sufficiently short distance as to be capable of supplying power
via the electromagnetic induction, and the resonant frequency
of the power supplying coil 224 need not be considered.
[0055] In this way, power is efficiently supplied to the
power receiving resonant coil 24 6 by the electromagnetic
resonance via the power transmitting resonant coil 226.
[0056] In the power receivers 230, 330, and 430, the power
receiving resonant coil 246 receives power from the power
transmitting resonant coil 226 via the magnetic field coupling
by the magnetic resonance. The power receiving resonant coil
24 6 supplies received power or current to the power fetching
unit 242. The power fetching unit 242 may receive power from
the power receiving resonant coil 246 via the power fetching
coil 244 by the electromagnetic induction. In this case, the
power receiving resonant coil 246 and the power fetching coil
244 are located at a sufficiently short distance that power can
be supplied by the electromagnetic induction, and the resonant
frequency of the power fetching coil 244 need not be considered.
[0057] * The power fetching unit 242 supplies the
alternating current to the rectification unit 235 as a load.
The charging circuit 262 of the devices 260, 360, and 460 is
adapted so as to supply a DC voltage to a battery 264. The
battery 264 supplies a required DC voltage in the devices 260,
360, and 460.
[0058] Figs . 5A and 5B illustrate one example of processing
and a communication procedure for supplying power between a
contractor information management server 100, a set of a
plurality of communication devices 204, 304, and 404, a
plurality of power transmitters 210, 310, and 410, and a
plurality of power receivers 230, 330, and 430.
[0059] In reference to Fig. 5A, in step 502, the power
suppliers of the contractor information management server 100
transmit power from an electric generation plant via a

transmission line 40, and supply power to the power supply
facilities of each contractor a, b, and x1 via the power meters
202, 302, and 402 (1).
[0060] In step 512, the power meters 202, 302, and 402
regularly or periodically supply the measured total power
supply amount to the communication devices 204 and 304 (2) . In
step 514, a key 216 is operated by contractors a, b, c, and x1,
power transmitters 230, 330, and 430 are activated, and using
power supplied from the power meters 202, 302 and 402, power
is supplied to the power transmitters 210, 310, and 410 (3) .
In step 516, the transceiver 218 of the power transmitters 210,
310, and 410 repeatedly transmits inquiry signals which include
the identification information of the contractors a, b, and xl
and the identification information of the power transmitters
210, 310, and 410 with a cycle of, for example, 1 to 4 seconds,
and waits for the reception of the response from the power
receivers 230, 330, and 430 (4). The identification
information is stored in the memory 213. After that, the
procedure moves on to step 602 in Fig. 6A or 7A.
[0061] In step 536, the transceiver 238 of the power
receivers 230, 330, and 4°30 receive the inquiry signals which
include the identification information of the contractors a,
b, and xl and the identification information of the power
transmitters 210, 310, and 410 from the power transmitters 210,
310, and 410 (5) . The power receivers 230, 330, and 430 may
always be in a state of reception or a preparation completed
state of power reception under the control of the controlling
unit 232, or the power receivers 230, 330, and 430 may be set
as a state of reception or as a preparation completed state of
power reception in accordance with the operation by the key 236
of the power receivers 230, 330, and 430 of contractors a, b,
and c.
[0062] In step 538, the controlling unit 232, in response
to the inquiry signals, decides whether or not to receive power
from the power transmitters 210, 310, and 410. The controlling

unit 232 decides to receive power when the power receivers 230,
330, and 430 are in a preparation completed state of power
reception. When a decision is made to receive power, the
procedure moves into a step 702 of Fig. 6A or 7A. When a decision
is made not to receive power, or when a decision is made that
it is not in a preparation completed state of power reception
in step 538, the controlling unit 232 does not respond to the
inquiry signals and does not receive power in step 540.
[0063] Figs. 6A and 6B illustrate an example of processing
and of a communication procedure for a power supply between
power transmitters 210, 310, and 410, and power receivers 230,
330, and 430, after the processing procedure of Fig. 5A and
before the processing procedure of Fig. 5B. For purposes of
explanation, it is assumed that the power transmission and the
power reception are performed between the power transmitter 210
and the power receiver 230. The processing and the
communication procedure of Figs. 6A and 6B are also applied to
the other power transmitters 310 and 410, and the other power
receivers 330 and 430.
[0064] In reference to Fig. 6A, in step 702, the power
receiver 230 is in a state of completed preparation for power
reception and its controlling unit 232 transmits a response
which includes the identification information of the contractor
a of the power receiver 230 and the identification information
of the power receiver 230 to the power transmitter 210 via the
transceiver 238, thereby establishing the communication with
the power transmitter 210 (6).
[0065] In step 602, the controlling unit 212 of the power
transmitter 210 receives the identification information of the
contractor a and of the power receiver 230 via the transceiver
218, thereby establishing the communication with the power
receiver 230 (6) . In step 604, the controlling unit 212 judges
whether or not it received the response from the power receiver
or whether or not the power receiver is present. When it is
judged that it did not receive the response or that there is

no power receiver present, the procedure goes back to step 516
of Fig. 5A. When it is judged that it received the response
or that there is a power receiver present, the procedure moves
on to step 606.
[0066] In step 606, the controlling unit 212 of the power
transmitter 210 judges whether or not the communication was
established with the power receiver 230. When it is judged that
the communication was not established, the procedure goes back
to step 516 of Fig. 5A. When it is judged that the communication
was established, the procedure moves on to step 608.
[0067] In step 608, the controlling unit 212 of the power
transmitter 210 authenticates the power receiver 230 on the
basis of the identification information of the contractors a,
b, c of the power receivers 230, 330, and 430 and/or the
identification information of the power receivers 230, 330, and
430 stored in the memory 213 beforehand (7). When it has
received a response which includes identification information
not in the memory 213, the controlling unit 212 may access the
data base 106 of the contractor information management server
100 via a communication device 204, acquire contractor
information which includes the identification information
which corresponds to the received identification information
(a) and the information of transmission condition or reception
condition, and the like, and authenticate the power receiver
230. When it is judged that the authentication has failed, the
procedure goes back to step 516 of Fig. 5A. When it is judged
that the authentication has succeeded, the procedure moves on
to step 620.
[0068] In step 620, the controlling unit 212 of the power
transmitter 210 transmits the power transmitting condition
stored in the memory 213 to the power receiver 230 via the
transceiver 218, and receives the power receiving condition of
the power receiver 230 from the power receiver 230 (8) . In step
720, the controlling unit 212 of the power receiver 230
transmits the power receiving condition stored in the memory

233 to the power transmitter 210 via the transceiver 238, and
receives the power transmitting condition of the power
transmitter 210 from the power transmitter 210 (8).
[0069] The power transmitting condition in the power
transmitter 210 may include, for example, the identification
information of contractors a, and x1, and the identification
information of the power transmitter 210. These pieces of
identification information may be transmitted or received
together with the power transmitting condition as the one
separated from the power transmitting condition.
The power transmitting condition may include information
of, for example, at least one selectable power transmitting
resonant frequency ft, an outer diameter of the power
transmitting resonant coil, a range of the power transmission
efficiency kt (lower threshold value kth) whether or not a
simultaneous power transmission by a plurality of power
transmitters is allowed, or whether or not a simultaneous power
reception by a plurality of power receivers is allowed. The
threshold value kth may be a certain value within the range of,
for example, 60 to 80%. The power transmitting condition may
further include information of the range of the power
transmission voltage (V), the range of the transmitted power
(W) , the maximum power transmission amount or power reception
amount (Wh), a time length for permissible power transmission
and power reception (second), and the like. The power
transmitting condition may further include information of
whether or not power is being transmitted to the other power
receiver at present, whether or not power has started to be
transmitted to the other power receiver, or whether or not the
power receiver which is the current power transmission
destination allows simultaneous power transmission.
The power transmission efficiency kt indicates the ratio
of the power portion Pr received by the transmitted power
portion Pt to the transmitted power portion Pt contributing to
the received power of the power receiver at a specific power

transmission destination in power transmitters 210, 310, and
410. The transmitted power portion contributing to the
received power of the power receiver of the other power
transmission destination is excluded. The received power
portion to which the transmitted power of the power transmitter
of the other transmission source contributes is excluded.
[0070] The power receiving condition in the power receiver
230 may include, for example, the identification information
of contractors a and the identification information of the power
receiver 230. These pieces of identification information may
be transmitted or received together with the power receiving
condition as the one separated from the power receiving
condition.
The power receiving condition may include information of,
for example, at least one selectable power receiving resonant
frequency fr, an outer diameter of the power receiving resonant
coil, a permissible range of a power reception efficiency kr
(lower threshold value kth) , whether or not a simultaneous power
transmission by a plurality of power transmitters is allowed,
or whether or not a simultaneous power reception by a plurality
of power receivers is allowed. The power receiving condition
may further include information of the range of the power
reception voltage (V) , the range of the received power (W) , the
maximum power reception amount (Wh), a time length for
permissible power reception (second) , and the like. The power
receiving condition may further include information of whether
or not power is being received from the other power transmitter
at present, whether or not power has begun to be received from
the other power receiver, or whether or not the power
transmitter which is the current power transmission source
allows simultaneous power reception. When the power receiver
230 is being received power from the other power transmitter
(for example, 310) currently, the transmitted power from the
power transmitter (310) and the currently received power and
power reception efficiency (kr) may be included as power

receiving conditions.
The power reception efficiency kr indicates the ratio of
the power portion Pr received by the transmitted power portion
Pt to the transmitted power portion Pt of the specific power
transmission source contributing to the received power in power
receivers 230, 330, or 430. The received power portion to which
the transmitted power of the power transmitter of the other
transmission source contributes is excluded. The transmitted
power portion contributing to the received power of the power
receiver of the other power transmission destination is
excluded.
[0071] In step 621, the controlling unit 212 of the power
transmitter 210 judges whether or not the power transmitting
condition and the power receiving condition fit together, or
conform. When it is judged that they fit together, the
procedure moves on to step 622. When it is judged that they
do not, the procedure moves on to step 640 of Fig. 6B. In step
721, the controlling unit 232 judges whether or not the power
transmitting condition and the power receiving condition fit
together, or conform. When it is judged that they fit together,
the procedure moves on to step 722. When it is judged that they
do not, the procedure moves on to step 741 of Fig. 6B.
[0072] If it is judged that any of the power transmitting
resonant frequencies ft and any of the power receiving resonant
frequencies fr might substantially fit together, it is judged
that the power transmitting condition and the power receiving
condition fit together with respect to the resonant frequencies.
Otherwise, for example, it is judged that the power transmitting
condition and the power receiving condition do not fit together.
When, for example, a combination of the contractor a of the power
transmitter 210 and the contractor c of the power receiver 430
is allowed, it is judged that the power transmitting condition
and the power receiving condition fit together with respect to
the combination of the contractors of the power transmitter and
the power receiver. Otherwise, for example, it is judged that

the power transmitting condition and the power receiving
condition do not fit together.
[0073] For example, when both the power transmitter 210
and the power receiver 230 allow a simultaneous power reception
by a plurality of power receivers, it is judged that the power
transmitting condition and the power receiving condition fit
together with respect to a simultaneous power reception.
Alternately, when the power transmitter 210 allows a
simultaneous power reception by a plurality of power receivers
while the power receiver 230 does not, then it is judged that
the power transmitting condition and the power receiving
condition do not fit together when the power transmitter 210
is transmitting power to the other power receiver or tries to
transmit power. In another case in which the power transmitter
210 allows a simultaneous power reception by a plurality of
power receivers while the power receiver 230 does not, then it
may be judged that the power transmitting condition and the
power receiving condition fit together when the power
transmitter 210 is not transmitting power to the other power
receiver and does not try to transmit power. In this case, the
power transmitting condition and the power receiving condition
do not fit together between the power transmitter 210 and the
other power receiver (330) even if the other power receiver
(330) tries to receive power simultaneously from the power
transmitter 210 later.
[0074] As another example, when both the power transmitter
210 and the power receiver 230 allow a simultaneous power
transmission by a plurality of power transmitters, it is judged
that the power transmitting condition and the power receiving
condition fit together with respect to a simultaneous power
reception. Alternately, when the power receiver 230 allows a
simultaneous power transmission by a plurality of power
transmitters while the power transmitter 210 does not, it is
judged that the power transmitting condition and the power
receiving condition do not fit together when the power receiver

230 is receiving power from the other power transmitter or tries
to receive power. In another case in which the power receiver
230 allows a simultaneous power transmission by a plurality of
power transmitters while the power transmitter 210 does not,
it may be judged that the power transmitting condition and the
power receiving condition fit together when the power receiver
230 is not receiving power from the other power transmitter and
does not try to receive power. In this case, the power
transmitting condition and the power receiving condition do not
fit together between the power receiver 230 and the other power
transmitter (310) even if the other power transmitter (310)
tries to transmit power simultaneously to the power receiver
230 later.
[0075] In step 622, the controlling unit 212 of the power
transmitter 210 transmits information which indicates that a
temporary power transmission to the power receiver 230 via the
transceiver 218 needs to be performed. Subsequently, the
controlling unit 212 activates the modulating unit 214, the
amplifier 216, and the power transmitting resonant coil 226,
adjusts the frequency and level, supplies power to the power
supplying unit 222, and transmits power temporarily or
transiently via the power transmitting resonant coil 226 (9) .
The controlling unit 212 measures the voltage and the current
supplied to the power supplying unit 222, and obtains the
transmitted power. In step 722, the controlling unit 232 of
the power receiver 230 receives information which indicates
that a temporary power transmission from the power transmitter
210 via the transceiver 238 needs to be performed. The
controlling unit 232, in response to the reception, activates
the rectification unit 236 and the power receiving resonant coil
246, adjusts the frequency, fetches power from the power
fetching unit 242 via the power receiving resonant coil 246,
and receives power temporarily or transiently (9). The
controlling unit 232 measures the voltage and the current
supplied from the power fetching unit 242, and obtains the

received power.
[0076] In reference to Fig. 6B, in step 624, the
controlling unit 212 of the power transmitter 210 transmits the
information of the power transmission state to the power
receiver 230 via the transceiver 218, and receives the
information of the power reception state from the power receiver
230 (10) . In step 724, the controlling unit 232 of the power
receiver 230 transmits the information of the power reception
state to the power transmitter 210 via the transceiver 238, and
receives the information of the power transmission state from
the power transmitter 210 (10).
[0077] The power transmission state of the power
transmitter 210 includes the current transmitted power (total) ,
the transmitted power to the power receiver of a transmission
address (correspondent) before the simultaneous power
transmission, the transmitted power to the other power receiver
which is not a transmission address before the simultaneous
power transmission, and the received power. In addition, the
power transmission state may include the current (estimated)
transmitted power to the power receiver of the transmission
address, the current (estimated) transmitted power to the other
power receiver, which is not the transmission address, and the
current (estimated) power transmission efficiency kt of the
transmitted power portion Pt to the power receiver of the
transmission address. Further, the power transmission state
may include (estimated) power transmission efficiency kt to the
total (estimated) received power portion of the power
transmission destination to which the transmitted power
contributes with respect to the total transmitted power Pt of
the power transmitter 210, and the current (estimated) power
transmission efficiency kt of the transmitted power portion Pt
to the power receiver which is not the transmission address.
The power transmission state may further include information
of, for example, completion of the power transmission, stopping
of the power transmission, and a normality (whether normal or

abnormal) of the power transmission state.
[0078] The power reception state of the power receiver 230
includes the currently received power (total), the received
power from the power transmitter of a transmission address
before the simultaneous power reception, the transmitted power
from the other power transmitter which is not a transmission
address before the simultaneous power reception, and the
received power. In addition, the power reception state may
include the current (estimated) received power from the power
transmitter of the transmission address, the current
(estimated ) transmitted power and received power from the other
power transmitter which is not the transmission address, and
the current (estimated) power transmission efficiency kr of the
received power portion Pr from the power transmitter of the
transmission address. The power reception state may further
include information which indicates that the power is being
received from the other power transmitter which is not the
transmission address before the simultaneous power reception.
Further, the power reception state may include the power
reception efficiency kr of the total received power with respect
to the total (estimated) transmitted power portion from all the
power transmitters of the power transmission source which
contribute to the received power of the power receiver 230. The
power reception state may further include information of, for
example, completion of the power reception, stopping of the
power reception, and the normality (whether normal or abnormal)
of the power reception state.
[0079] In step 626, the controlling unit 212 of the power
transmitter 210 judges whether or not the power transmission
state of the power transmitter 210 and the power reception state
of the power receiver 230 are normal. When it is judged that
the power transmission state and the power reception state are
normal, the procedure moves on to step 628. When it is judged
that the power transmission state and the power reception state
are abnormal, the procedure moves on to step 640.

[0080] In step 726, the controlling unit 232 of the power
receiver 230 judges whether or not the power transmission state
of the power transmitter 210 and the power reception state of
the power receiver 230 are normal. When it is judged that the
power transmission state and the power reception state are
normal, the procedure moves on to step 728. When it is judged
that the power transmission state and the power reception state
are abnormal, the procedure moves on to step 741.
[0081] In step 626 and step 726, whether or not the power
transmission state and the power reception state are normal may
be judged, for example, as follows.
When the power transmission efficiency kt is not greater
than the threshold value kth, it may be judged that the power
transmission state is abnormal.
When the power reception efficiency kr is not greater than
the threshold value kth/ it may be judged that the power reception
state is abnormal.
When the entirety or later of the power transmission
efficiency kt or of the power reception efficiency kr in the
simultaneous temporary power reception by a plurality of power
receivers become not greater than the threshold value kth with
respect to all the selectable resonant frequencies fr=ft, it
may be judged that only the power reception state of the later
power receiver (e.g., 330) having a low priority is abnormal.
In this case, it is possible that the power reception
environment of the later power receiver is inappropriate.
When the entirety or later of the power transmission
efficiency kt of the power transmission in the simultaneous
temporary power transmission by a plurality of power
transmitters become not greater than the threshold value kth
with respect to all the selectable resonant frequencies fr=ft,
it may be judged that only the power transmission state of the
later power transmitter (e.g., 310) having a low priority is
abnormal. For example, when the phase of the power transmission
magnetic field of the two power transmitters 210 and 310 are

in reverse phase with each other, it is possible that the
entirety or each of the respective power transmission
efficiencies kt greatly lowers in the temporary power
transmission.
In a case in which the temperature of a temperature sensor
228 or 248 rises over the threshold value, it may be judged that
the power transmission state or the power reception state is
abnormal.
[0082] In step 628, the controlling unit 212 of the power
transmitter 210 transmits information which indicates the
start-up or continuation of the power transmission, and further,
it may transmit information which indicates the selected power
receiving resonant frequencies fr. As required, the
controlling unit 212 may control the modulating unit 214, the
amplifier 215, and the power transmitting unit 220, adjust the
power transmitting resonant frequency ft of the power
transmitting resonant coil 226, and start or continue power
transmission to the power receiver 230 (11) . In step 728, the
controlling unit 232 of the power receiving unit 230 receives
information which indicates the start-up or continuation of the
power transmission and indicates a power receiving resonant
frequency fr, and as required it controls the power receiving
unit 240 and the rectification unit 235 so as to receive the
transmitted power and start or continue the power reception (11) .
The controlling unit 232 may adjust the power receiving resonant
frequency fr of the power receiving resonant coil 246 following
information which indicates the received power receiving
resonant frequency fr.
[0083] In step 630, the controlling unit 212 of the power
transmitter 210 transmits information of the power transmission
state to the power receiver 230 via the transceiver 218, and
receives information of the above mentioned power reception
state from the power receiver 230 (12). In step 730, the
controlling unit 232 of the power receiver 230 transmits
information of the power reception state to the power

transmitter 210 via the transceiver 238, and receives
information of the above mentioned power transmission state
from the power transmitter 210 (12).
[0084] In step 628 or 630, the controlling unit 212 of the
power transmitter 210 may further transmit the identification
information of the contractor a of the power transmitter 210
and the identification information of the power transmitter 210
in order to authenticate the power receiver 230 via a
transceiver 218, receive the identification information for
authentication from the power receiver 230, and authenticate
the power receiver 230. The controlling unit 232 of the power
receiver 230, in step 728 or 730, may further transmit the
identification information of the contractor a of the power
receiver 230 and the identification information of the power
receiver 230 for authentication to the power transmitter 210
via the transceiver 238, and receive identification information
for authentication from the power transmitter 210 and
authenticate power transmitter 210.
[0085] In step 636, the controlling unit 212 of the power
transmitter 210 judges whether or not the power transmission
from the power transmitter 210 to the power receiver 230 is
possible or whether or not the power reception by the power
receiver 230 is possible, on the basis of the power transmission
state information, the power reception state, and the
authentication result. When it is judged that it is not
possible, the procedure moves on to step 640. When it is judged
that it is possible, it is judged whether or not the controlling
unit 212 completes the power transmission in step 638 *
[0086] When the controlling unit 212 decides not to
complete the power transmission in step 638, the procedure goes
back to step 628. When it decides to complete the power
transmission in step 638, the procedure moves on to step 640.
In step 640, the controlling unit 212 performs control to stop
the modulating unit 214 and the amplifier 215 and stops the power
transmission (14).

[0087] In step 740, the controlling unit 232 of the power
receiver 230 judges whether or not to stop the power reception.
When it decides to stop the power reception, the procedure moves
on to step 741. When it decides not to stop the power reception,
the procedure goes back to step 728. In step 741, the
controlling unit 232 performs control to stop the power
receiving unit 240 and the rectification unit 236, and completes
the power reception (14).
[0088] The following are examples of cases that are judged
as incapable of receiving power in step 636. The exemplary
cases include when the power transmission state and the power
reception state in step 628 are not normal as mentioned above,
when the power receiver 230 fails to be authenticated, and when
the information of the power reception state is not received
over the time of the threshold value (e.g., 2 seconds).
When, for example, the power transmission efficiency kt
is not greater than the threshold value kthf it may be judged
that the power transmission state is abnormal and that it is
incapable of receiving power.
When, for example, the power transmission efficiency kt
of the entirety or the latter of the power transmission in the
simultaneous power reception by a plurality of power receivers
becomes not greater than the threshold value kth, it may be judged
that only the power reception state of the latter power receiver
(e.g., 330), having a low priority, is abnormal and that it is
incapable of receiving power.
[0089] The following are examples of cases in which it is
judged that the power transmission is completed in step 638.
The exemplary cases include when the user of the power
transmitter 210 operates a key 216 of the power transmitter 210
to stop the power transmission, and when the power transmitter
210 receives information which indicates the stopping of the
power reception from the power receiver 230.
[0090] The following are examples of cases in which it is
judged that the power reception is completed in step 740. The

exemplary cases include when the power transmission state and
the power reception state in step 728 are not normal as mentioned
above, when authentication of the power transmitter 210 fails,
when the information of the power transmission state is not
received over the time of the threshold value (e.g., 2 seconds) ,
and when the power reception or the battery charging of the
device 260 is completed. In addition, when the user of the power
receiver 230 operates a key of the power receiver 230 to stop
the power reception, and when the power receiver 230 receives
information which indicates the stopping of the power
transmission from the power transmitter 210, it is judged that
the power reception is completed.
When, for example, the power reception efficiency kr is
not greater than the threshold value kth, it may be judged that
the power reception state is abnormal and that it may stop power
reception.
When, for example, the entirety or the latter of the power
transmission efficiency kt or the power reception efficiency
kr during the simultaneous power transmission by a plurality
of power transmitters becomes not greater than the threshold
value kthf it may be judged that only the reception state from
the latter power transmitter (e.g., 310), having a low priority,
is abnormal and may stop power reception from the power
transmitter. In this case, only the power transmission from
the power transmitter (310) may be stopped.
When, for example, the power transmitting condition and
the power receiving condition do not fit together after the
start-up of the power transmission and the power reception, it
may be judged that the power transmission state or the power
reception state is abnormal and may stop the power transmission.
[0091] The power receiver 230 continues the power
reception when the power reception from the other power
transmitters (310) is continued, even when it receives
information which indicates the stopping of the power
transmission from the power transmitter 210 of the power

transmission address. The power transmitter 210 continues the
power transmission when the power transmission to the other
power receiver (330) is continued, even when it receives a
signal which indicates the stopping of the power reception from
the power receiver 230 of the communication address.
[0092] In step 644, the controlling unit 212 of the power
transmitter 210 completes the communication via the transceiver
218. The transceiver 218 may report the completion of the
communication to the power receiver 230. In step 744, the
controlling unit 232 of the power receiver 230 completes the
communication via the transceiver 238 . The transceiver 238 may
report the completion of the communication to the power
transmitter 210.
[0093] Subsequently, in the power transmitter 210, the
procedure goes back to step 516 of Fig. 5A, and at the same time,
moves on to step 522 of Fig. 5B. In the power receiver 230,
the procedure moves on to step 546 of Fig. 5B.
[0094] In reference to Fig. 5B, in step 522, the
controlling unit 212 of the power transmitter 210 supplies power
transmission information which includes the identification
information of the contractors a and xl of the power transmitter
210, the identification information of the contractor a of the
power receiver 230, the power transmission amount in each time
period, and the like, to the communication device 204 via the
interface 219 (16). The power transmission information is
stored in the memory 213. The communication device 204 stores
the power transmission information in the memory.
In step 524, the communication device 204 transmits the
identification information of the contractor a or xl with
respect to the power meter 202, the total power supply amount
of the power meter 202 at a measured time, and the power
transmission information, stored in the memory, to the
contractor information management server 100 via the network
50 (17) . The power transmitter 210 may further transmit the
power reception information of the power receiver 230 received

in step 630 to the contractor information management server 100
via the communication device 204 and the network 50. By the
power transmitter 210's transmitting the power reception
information of the power receiver 230 to the contractor
information management server 100, the accuracy of the power
reception information transmitted by the power receiver 230 may
be verified in the contractor information management server
100.
After that, the procedure goes back to step 512 or 516
of Fig. 5A.
[0095] In step 514, the processor 102 of the contractor
information management server 100 receives the identification
information of the contractor a or xl with respect to the power
meter 202 from the communication device 204, the total power
supply amount of the power meter 202, and the power transmission
information, and stores it in the storage device 104.
[0096] In step 546, the controlling unit 232 of the power
receiver 230 transmits the power reception information which
includes the identification information of the contractor a or
xl of the power transmitter 210, the identification information
of the contractor a of the power receiver 230, the power
reception amount, and the like, to the
contractor information management server 100 via the
transceiver 239, the wireless base station 52, and the network
50 (18) .
By the power receiver 230's transmitting the power
reception information to the contractor information management
server 100, accurate power reception information of the power
receiver 230 may be transmitted, and the user of the power
receiver 230 may confirm the transmission of the power reception
information. In addition, with this, when the power reception
information is transmitted only by the power transmitter 210,
errors in the power reception information which are liable to
occur when, for example, the wireless communication between the
power receiver 230 and the power transmitter 210 stops or when

the wireless communication between the power receiver 230 and
the power transmitter 210 is not completed normally, may be
prevented.
The power receiver 230 may further transmit the power
transmission information of the power transmitter 210 received
in step 730 to the contractor information management server 100
via the wireless base station 52 and the network 50. By the
power receiver 230's transmitting the power transmission
information to the contractor information management server 100,
the accuracy of the power transmission information transmitted
by the power transmitter 210 may be verified in the contractor
information management server 100.
After that, the procedure may go back to step 536 of Fig.
5A.
[0097] In step 516, the processor 102 of the contractor
information management server 100 receives the power reception
information from the power receiver 330 via the network 50, and
stores it in the storage device 104 (19) .
[0098] In step 518, the processor 102 of the contractor
information management server 100 fetches the identification
information of the contractors a and xl of the power transmitter
210, the identification information of the contractor a of the
power receiver 230, the power transmission information which
includes the power transmission amount, and the power reception
information which includes the power reception amount from the
storage device. The processor 102 calculates the power fees
for the power reception amount applied to the power receiver
230 on the basis of the power transmission amount and the power
reception amount between the power transmitter 210 and the power
receiver 230 and charges the fees to the contractor of the power
receiver 230 (20).
[0099] The processing and the communication procedure of
Figs. 6A and 6B may be applied to the power transmission of the
optional combinations between a plurality of the power
transmitters 210, 310, and 410, and a plurality of the power

receivers 230, 330, and 430. The plurality of the power
transmitters 210, 310, and 410, when available, may transmit
to one or more power receivers 230, 330, or 430 simultaneously.
In addition, the plurality of the power receivers 230, 330, and
430, when available, may receive from one or more power
transmitters 210, 310, or 410 simultaneously.
[0100] For example, it is presupposed that the power
transmitter 210 has succeeded in authenticating the other power
receiver 330 at a second thread in step 608 of Fig. 6A while
transmitting power to the power receiver 230 at a first thread.
In this case, the controlling unit 212 of the power transmitter
210 judges whether or not the conditions of the power
transmission and the power reception between the power
transmitter 210 and the power receiver 230 fit together with
respect to the simultaneous power reception, and further judges
whether or not the conditions with respect to the power
transmission and the power reception between the power
transmitter 210 and the power receiver 330 fit together. When
it is judged that these conditions fit together, the procedure
moves on to step 622. When it is judged that these conditions
do not fit together, the procedure moves on to step 640. In
step 64 0 of Fig. 6B, the controlling unit 212 transmits
information which indicates the stopping of the power
transmission to the other power receiver 330 via the transceiver
218. The controlling unit 232 of the power receiver 330, when
it receives information which indicates the stopping of the
power transmission via the transceiver 238, decides to stop the
power reception in step 740.
[0101] As another example, it is presupposed that the power
receiver 230 has succeeded in the authentication by the other
power transmitter 310 at a second thread in step 608 of Fig.
6A while receiving power from the power transmitter 210 at a
first thread. In this case, the controlling unit 232 of the
power receiver 230 judges whether or not the conditions of the
power transmission and the power reception between the power

transmitter 210 and the power receiver 230 fit together with
respect to the simultaneous power transmission, and further
judges whether or not the conditions of the power transmission
and the power reception between the power transmitter 310 and
the power receiver 230 fit together in step 721. When it is
judged that these conditions fit together, the procedure moves
on to step 722. When it is judged that these conditions do not
fit together, the procedure moves on to step 741. In step 741
of Fig. 6B, the controlling unit 232 transmits information which
indicates the completion of the power reception to the other
power transmitter 310 via the transceiver 238 . The controlling
unit 212 of the power transmitter 310, when it receives
information which indicates the completion of the power
reception via the transceiver 218, judges to complete the power
transmission in step 638.
[0102] Figs. 7A and 7B respectively illustrate another
example of a processing procedure for supplying power between
the power transmitters 210, 310, and 410 and the power receivers
230, 330, and 430 after the processing procedure of Fig. 5A and
before the processing procedure of Fig. 5B. For purposes of
explanation, it is assumed that the power transmission and the
power reception are performed between the power transmitter 210
and the power receiver 230. The processing procedure of Figs.
7A and 7B are also applied to the other power transmitters 310
and 410 and the other power receivers 330 and 430.
[0103] In reference to Fig. 7A, steps 602 to 608 and step
702 are the same as those of Fig. 6A.
[0104] In step 610, the controlling unit 212 of the power
transmitter 210 judges whether or not the power transmitter 210
is transmitting power or is trying to transmit power to the other
power receiver (e.g., 330) . When it is judged that the power
transmitter 210 is not transmitting power or is not trying to
transmit power to the other power receiver, the procedure moves
on to step 620. When it is judged that the power transmitter
210 is transmitting power or is trying to transmit power to the

other power receiver, in step 612, the controlling unit 212
transmits information which indicates that simultaneous power
reception needs to be performed to the power receiver 230 via
the transceiver 218 (8t) . After that, the procedure moves on
to step 620. When the information which indicates that
simultaneous power reception needs to be performed is
transmitted, in step 712, the controlling unit 232 of the power
receiver 230 receives the information which indicates that
simultaneous power reception needs to be performed by the power
transmitter 210 via the transceiver 238 (8t) . After that, the
procedure moves on to step 720.
[0105] Steps 620 to 622 and 720 to 722 are the same as those
of Fig. 6A. In steps 621 and 721, when the conditions do not
fit together with respect to whether or not the power
transmitting condition and the power receiving condition allow
simultaneous power reception, the procedure moves on to steps
640 and 741 of Fig. 6B. In this case, the power reception is
completed without performing power reception by the power
receiver 230. When the conditions as to whether or not the power
transmitting condition and the power receiving condition
between the power transmitter 210 and the power receiver 230
and between the power transmitter 210 and the power receiver
330 allow simultaneous power reception are matched, the
procedure moves on to steps 622 and 722. In regard to whether
or not the power transmitting condition and the power receiving
condition allow simultaneous power reception, even when the
power receiving condition of the power receiver 230 allows the
simultaneous power reception, when the power reception by the
former other power receiver (330) has higher priority and the
power receiving condition of the other power receiver (330) does
not allow the simultaneous power reception, the conditions do
not fit together and the power reception by the latter power
receiver 230 is denied or stopped.
[0106] In reference to Fig. 7B, steps 624 to 630 and 724
to 730 are the same as those of Fig. 6B.

[0107] In step 632, the controlling unit 212 of the power
transmitter 210 judges whether or not the other power reception
by the other power receiver (e.g., 330) has been started or
completed while the power is transmitted to the power receiver
210 by the power transmitter 210. The judgment as to whether
or not the power reception by the other power receiver (330)
has been started is made by judging whether or not the power
transmitting condition and the power receiving condition
between the power transmitter 210 and the power receiver 230
and between the power transmitter 210 and the power receiver
330 fit together, after the power transmitter 210 has succeeded
in authenticating the other power receiver (330). Also, when
the power reception by the other power receiver 330 has been
completed {step 740) , while the power receivers 230 and 330 are
simultaneously receiving the power from the power transmitter
210, it is judged that the other power reception by the other
power receiver is completed. When it is judged that the power
reception by the other power receiver 330 has been started or
completed, the procedure goes back to step 622.
[0108] In regard to whether or not the power transmitting
condition and the power receiving condition allow the
simultaneous power reception, the procedure goes back to step
622 of Fig. 7A even when the power transmitting condition and
the power receiving condition between the power transmitter 210
and the power receivers 230 and 330 fit together and the
simultaneous power reception is possible. With this, in step
622 and 722, the temporary power transmission and the temporary
power reception between the power transmitter 210 and the power
receivers 230 and 330 are started.
[0109] As an alternative embodiment, after a branching of
YES (affirmation) in step 632, the procedure may go back to step
612. In this case, in step 612, the power transmitter 210
reports the starting-up or the completion of the simultaneous
power reception to the power transmitter 230 as well, and
between the power transmitter 210 and the power transmitter 230,

steps 620 and 720 are executed again.
[0110] Concerning the judgment of whether or not the power
reception by the other power receiver 330 has been started, when
the power transmitting condition and the power receiving
condition between the power transmitter 210 and the power
receivers 230 and 330 do not fit together, the power reception
by the other power receiver 330 is denied or stopped. In
addition, when the power reception by the former power receiver
230 has priority and the simultaneous power reception is not
allowed by the former power receiver 230, the power transmitting
condition and the power receiving condition do not fit together,
and the power reception by the latter other power receiver 330
is denied or stopped. When it is judged that the power
transmitting condition and the power receiving condition do not
fit together, the procedure moves on to step 636.
[0111] Steps 636 to 644 and 740 to 744 are the same as those
of Fig. 6B.
[0112] Fig. 8 illustrates an example of changes in the
power transmission efficiency k with respect to the power
transmission distance D from the power transmitters 210, 310,
and 410 to the power receivers 230, 330, and 430, and a method
of calculating the power fees for the power reception amount
Pr on the basis of the power transmission efficiency k is
performed by the contractor information management server 100.
[0113] The power transmission efficiency k is represented
by a percentage of the power reception amount Pr with respect
to the power transmission amount Pt. In Fig. 8, generally, as
the power transmission distance D between the power transmitter
210 and the power receiver 230 increases, the power transmission
efficiency k gradually decreases as illustrated by a solid
curved line. A difference Pt-Pr (i.e., 100-k%) between the
power transmission amount Pt (i.e., 100%) and the power
reception amount Pr (i.e., k%) becomes a loss.
This loss portion may be covered between the electric
power company and the contractor a of the power receiver 230

with a predetermined ratio. For example, the loss portion may
be covered between the electric power company and the contractor
a of the power receiver 230 with a ratio of p: s=50%: 50%.
Alternatively, in order that the electric power company may
cover more, for example, the ratio may be p/s > 1. Alternatively,
in order that the contractor a may cover more, for example, the
ratio may be p/s < 1.
The processor 102 of the contractor information
management server 100 may calculate the fee C for the power
reception amount Pr of the power receiver 230 by the following
formula.
C = Pt x (k+s) % x Y=(Pr x 100/k) x (k+s) % x y
The processor 102 may charge the fee to the contractor
a. Here, Y represents the fee or fee ratio for the power amount
per unit Pu. Therefore, the power transmission amount Pt * p %
becomes the loss portion or coverage of the electric suppliers.
The ratio (k+s) % represents the coverage ratio of the
contractor a.
[0114] When the power is fed simultaneously to a plurality
of power receivers (230, 330, and 430) from one power
transmitter 210, the fee may be prorated in accordance with the
respective power reception amount (Prl, Pr2, and Pr3) on the
basis of the total power reception amount Pr. In this case,
the fee CI for the power reception amount Prl of the power
receiver 230 may be calculated, for example, by the following
formula.
Cl=(Pr x 100/k) x (k+s) % x y x (Prl/Pr)
[0115] As an alternative embodiment, to the power receiver
230 which starts the power reception earlier, the fee for an
actual power reception amount Prla during the simultaneous
power reception on the basis of the power transmission
efficiency kl with respect to the power reception amount Prl
before the start-up of the simultaneous power reception may be
applied, and to the power receiver 330 which starts the power
reception later by the simultaneous power reception, the fee

may be applied on the basis of the estimated power transmission
efficiency k2 for a remaining power reception amount Pr2 for
the power reception amount Pr2 during the simultaneous power .
reception.
[0116] Concerning, for example, the power transmission
efficiency k 1 with respect to the former power receiver 230,
and the power transmission efficiency k 12 with respect to the
two power receivers 230 and 330, since the power transmission
amount Ptl before the start of the simultaneous power reception
is represented as Ptl = Prl * 100/kl, the fee CI for the power
reception amount Prla of the power receiver 230 with the
simultaneous power reception being performed is represented by
the following formula.
CI = Ptla x (kl+s) % x Y
=(Prla x 100/kl) x (kl+s) % x y
Here, Ptla represents an estimated power transmission
amount contributing to the power reception amount Prla.
[0117] In this case, the fee C2 for the power reception
amount Pr2 of the power receiver 330 during the simultaneous
power reception is represented, for example, by the following
formula as a difference amount of the fee C with respect to the
total power reception amount Pr and the fee CI with respect to
the power reception amount Prla.
C2 = Pt2 x (k2+s2) % x y
= Pt x (kl2+s) % x Y - {Prla x 100/kl) x (kl+s) % x y
= ((Prla + Pr2) x 100/kl2) x (kl2+s) % x Y - (Prla x 100/kl) x
(kl+s)% x y
Here, s2 represents an estimated coverage rate for the
power reception amount Pr2 of the loss portion of the power
transmission.
[0118] As an alternative embodiment, it may be configured
that the power suppliers may charge the fee at the same rate
on the basis of the power transmission efficiency kl of the power
transmission amount with respect to the power receiver 230
before the start of the simultaneous reception. In this case,

the fee C2 for the power reception amount Pr2 of the power
receiver 330 during the simultaneous power reception on the
basis of the total power transmission amount Pt is represented,
for example, by the following formula.
C2 = Pt2 x (k2+s2) % x Y
= (Pt - Ptl) x (kl+s) % x y
= ((Prla + Pr2) x 100/kl2 - Prl x 100/kl) x (kl+s) % x Y
[0119] When the power is simultaneously fed to one power
receiver 230 from a plurality of power transmitters (210, 310,
and 410) , the fee may be prorated in accordance with the
respective power transmission amounts (Ptl, Pt2, and Pt3) on
the basis of the total power transmission amount Pt and the total
power reception amount Pr, and the respective fees for the power
reception may be calculated separately. In this case, the fee
CI for the power reception amount Prl may be calculated, for
example, by the following formula.
CI = Pt x (k+s) % x Y x (Ptl/Pt)
= (Pr x 100/k) x (k+s) % x Y x (Ptl/Pt)
In this case, the estimated power reception amount Prl
from the power transmitter 210 is represented, for example, by
the following formula.
Prl = Pr x (Ptl/Pt)
[0120] As an alternative embodiment, to the power
transmitter 210 which starts the power transmission earlier,
the fee for an actual power transmission amount Ptla may be
applied during the simultaneous power transmission on the basis
of the power transmission efficiency k with respect to the power
transmission amount Ptl at the start-up of the simultaneous
power transmission, and to the power transmitter 310 which
starts the power transmission later by the simultaneous power
transmission, the fee may be applied on the basis of the
estimated power transmission efficiency k2 for a remaining
power transmission amount Pt2.
[0121] Concerning, for example, the power transmission
efficiency k 1 with respect to the former power transmitter 210,

and the power transmission efficiency k 12 with respect to the
two power transmitters 210 and 310, since Ptl before the
start-up of the simultaneous power transmission is represented
as Ptl = Prl x 100/kl, the fee CI for the estimated power
reception amount Prl which corresponds to the power
transmission amount Ptla of the power transmitter 210 during
the simultaneous power transmission is represented by the
following formula.
CI = Ptla x (kl+s) % x y
[0122] In this case, the fee C2 for the estimated power
reception amount Pr2 which corresponds to the power
transmission amount Pt2 of the power transmitter 310 during the
simultaneous power transmission is represented, for example,
by the following formula as a difference amount of the fee C
with respect to the total power transmission amount Pt and the
fee CI with respect to the power transmission amount Ptla.
C2 - Pt2 x (k2+s2) % x y
= Pt x (kl2+s) % x Y - Ptla x (kl+s) % x Y
= Pt x (kl2+s) % x y - (Prla x 100/kl) x (kl+s) % x Y
Here, s2 represents an estimated coverage rate for the
power transmission amount Pt2 of the loss portion of the power
transmission.
[0123] As an alternative embodiment, it may be configured
that the power suppliers may charge the fee at the same rate
on the basis of the power transmission efficiency kl of the power
transmission amount of the power transmitter 210 before the
start-up of the simultaneous power transmission. In this case,
the fee C2 for the power transmission amount Pt2 of the power
transmitter 310 during the simultaneous power transmission on
the basis of the total power transmission amount Pt is
represented, for example,"by the following formula.
C2 = Pt2 x (k2+s2) % x Y
= (Pt - Ptl) x (kl+s) % x Y
[0124 ] When each of the plurality of the power transmitters
simultaneously transmits power to the plurality of the power

receivers, and each of the plurality of the power receivers
simultaneously receives power from the plurality of the power
transmitters, each power transmission amount (Ptl, Pt2, ...) and
each power reception amount (Prl, Pr2, ...) may be estimated by
a proration on the basis of the total power transmission amount
of the plurality of the power transmitters (Pt=Ptl + Pt2+...) and
the total power reception amount of the plurality of the power
receivers (Pr=Prl+Pr2+...) . As an alternative embodiment, by
analyzing the sequential order of the start-up and the
completion of the simultaneous power transmission and the
simultaneous power reception between one power transmitter and
one power receiver, the fees before the start-up of the
simultaneous power transmission or the simultaneous power
reception may be applied to the former power receiver, and the
difference amount of the fees during the simultaneous power
transmission and the fees before the simultaneous power
transmission or the simultaneous power reception may be charged
to the latter power receiver.
[0125] Figs. 9A and 9B respectively illustrate an example
of changes in the power transmission efficiency k for the power
transmission distance D with respect to the different
transmitting resonant frequencies and power receiving resonant
frequencies f = Fl, F2.
[0126] In the power transmission distance D = dl, the power
transmission efficiency k with respect to the resonant
frequency Fl in Fig. 9A is higher than the power transmission
efficiency k with respect to the resonant frequency F2 in Fig.
9B. In the distance D = d2, the power transmission efficiency
k with respect to the resonant frequency Fl in Fig. 9A is lower,
to some extent, than the power transmission efficiency k with
respect to the resonant frequency F2 in Fig. 9B. In the distance
D = d3, and the power transmission efficiency k with respect
to the resonant frequency Fl in Fig. 9A is substantially lower
than the power transmission efficiency k with respect to the
resonant frequency F2 in Fig. 9B.

[0127] Therefore, in step 622 of Figs. 6A and 7A, the
controlling unit 212 of the power transmitter 210 sequentially
transmits the values of the different plurality of resonant
frequencies ft = fr = Fl, F2, and F3 at different time periods
to the power receiver 230. The time period may be provided by
the number of selectable different resonant frequencies ft=fr,
or the time period may be provided by the number of
representative resonant frequencies ft=fr, so that the power
transmission efficiency k may be interpolated for the
frequencies between the adjacent frequencies. In step 722 of
Figs. 6A and 7A, the controlling unit 232 of the power receiver
230 sequentially receives the values of the different plurality
of resonant frequencies ft = fr = Fl, F2, and F3 at a first time
period and a second time period respectively from the power
transmitter 210.
In the first time period, the power transmitter 210
adjusts the power transmitting resonant coil 226 to be the power
transmitting resonant frequency ft - Fl, and temporarily
transmits power via the power transmitting unit 220. In the
first time period, the power receiver 230 adjusts the power
receiving resonant coil 246 to be the power receiving resonant
frequency fr = Fl, and temporarily receives power via the power
receiving unit 240.
In the second time period, the power transmitter 210
adjusts the power transmitting resonant coil 226 to be the power
transmitting resonant frequency ft = F2, and temporarily
transmits power via the power transmitting unit 220. In the
second time period, the power receiver 230 adjusts the power
receiving resonant coil 246 to be the power receiving resonant
frequency fr = F2, and temporarily receives power via the power
receiving unit 240.
In the third time period, the power transmitter 210
adjusts the power transmitting resonant coil 226 to be the power
transmitting resonant frequency ft = F3, and temporarily
transmits power via the power transmitting unit 220. In the

third time period, the power receiver 230 adjusts the power
receiving resonant coil 246 to be the power receiving resonant
frequency fr = F3, and temporarily receives power via the power
receiving unit 240.
When some of the plurality of the power receivers have
a high priority when the power receiver {e.g., 230) which starts
power reception earlier has a higher priority, the power
transmitter 210, in step 622, may transmit only the resonant
frequency in the power transmission to the former power receiver
(230) to the latter power receiver (330) in step 622 and may
temporarily transmit power with only the resonant frequency.
In step 724, the power receiver 230 transmits each power
reception amount in the first and second time periods to the
power transmitter 210. In step 624, the power transmitter 210
receives each power reception amount in each time period from
the power receiver 230 . The power transmitter 210 (controlling
unit 212) calculates the power transmission efficiency k on the
basis of each power transmission amount and power reception
amount for the power transmitting resonant frequency ft=fr=Fl,
F2, and F3, excludes the power transmitting resonant frequency
ft which has generated a power transmission efficiency k of not
greater than the threshold value, and selects the power
transmitting resonant frequency ft = fr which has generated the
higher power transmission efficiency k.
In step 622, when the power transmitter 210 temporarily
transmits power to a plurality of power receivers 230, 330, and
4 30 simultaneously, it may select the power transmitting
resonant frequency ft and the power receiving resonant
frequency fr which generate the highest power transmission
efficiency k of the total power reception amounts of the power
receivers 230, 330, and 430 with respect to the total power
transmission amounts of the power transmitter 210.
[0128] In step 628, the power transmitter 210 transmits
information which indicates the start-up of the power
transmission, for example information which indicates the power

receiving resonant frequency fr = Fl, and starts the power
transmission. In step 728, the power receiver 230 receives
information which indicates the start-up of the power
transmission, for example information which indicates the power
receiving resonant frequency fr = Fl, and starts the power
reception.
[0129] Fig. 10 illustrates an example of the power
transmission procedure when power is transmitted to any of the
power receivers 230, 330, and 430 which perform simultaneous
power reception from one power transmitter 210 or 310 according
to the processing procedure of Figs. 6A and 6B or Figs. 7A or
7B in Fig. 1 or 2. For purposes of explanation, it is assumed
that the power transmission and power reception are performed
between the power transmitter 210 and the power receivers 230,
330, and 430.
[0130] The power transmitter 210 executes step 516 of Fig.
5A at a first thread, and transmits the inquiry signals. The
power receiver 230, in step 536 {Fig. 5A) , receives the inquiry
signals from the power transmitter 210. After that, the power
transmitter 210 executes step 802, that is, the processing of
steps 602 to 638 (Figs. 6A and 6B or Figs. 7A and 7B) at a first
thread, and during that period, the power receiver 230 executes
step 902, that is, the processing of steps 702 to 740 (Figs.
6A and 6B or Figs. 7A and 7B).
[0131] The power transmitter 210 executes step 516 (Fig.
5A) at a second thread during the period when it transmits power
to the power receiver 230 at a first thread, and transmits the
inquiry signals. The power receiver 330, in step 536 (Fig. 5A) ,
receives the inquiry signals from the power transmitter 310.
After that, the power transmitter 210 executes step 812, that
is, the processing of steps 602 to 638 (Figs. 6A and 6B or Figs.
7A and 7B) at a second thread, and during that period, the power
receiver 330 executes step 912, that is, the processing of steps
702 to 740 (Figs. 6A and 6B or Figs. 7A and 7B) . Therefore,
the power transmitter 210 transmits power to the power receiver

330 at a second thread during the period when it transmits power
to the power receiver 230 at a first thread.
[0132] After that, the power transmitter 210 executes step
640 (Fig. 6B or 7B) at a first thread, and transmits information
which indicates the stopping of the power transmission to the
power receiver 230. In step 741 (Fig. 6B or 7B) , the power
receiver 230 completes the power reception in response to the
reception of the information which indicates the stopping of
the power transmission. In step 644 (Fig. 6B or 7B) , the power
transmitter 210 completes the wireless communication with the
power receiver 230 at a first thread. In step 744 (Fig. 6B or
7B) , the power receiver 230 completes the wireless
communication with the power transmitter 210.
[0133] The power transmitter 210 executes step 516 of Fig.
5A at a third thread during the period when it transmits power
to the power receiver 330 at a second thread, and transmits the
inquiry signals. The power receiver 430, in step 536, receives
the inquiry signals from the power transmitter 310 . After that,
the power transmitter 210 executes step 822, that is, the
processing of steps 602 to 638 (Figs. 6A and 6B or Figs. 7A and
7B) at a third thread, and during that period, the power receiver
430 executes step 922, that is, the processing of steps 702 to
740 (Figs. 6A and 6B or Figs. 7A and 7B) . Therefore, the power
transmitter 210 transmits power to the power receiver 330 at
a third thread during the period when it transmits power to the
power receiver 230 at a second thread.
[0134] After that, the power transmitter 210 executes step
640 of Fig. 6B or 7B at a second thread, and transmits information
which indicates the stopping of the power transmission to the
power receiver 330. In step 741 (Fig. 6B or 7B) , the power
receiver 330 completes the power reception in response to
reception of the information which indicates the stopping of
the power transmission. In step 644 (Fig. 6B or 7B) , the power
transmitter 210 completes the wireless communication with the
power receiver 330 at a second thread. In step 744 (Fig. 6B

or 7B) , the power receiver 330 completes the wireless
communication with the power transmitter 210.
[0135] After that, the power transmitter 210 executes step
640 (Fig. 6B or 7B) at a third thread, and transmits information
which indicates the stopping of the power transmission to the
power receiver 430. In step 741 (Fig. 6B or IB), the power
receiver 430 completes the power reception in response to the
reception of the information which indicates the stopping of
the power transmission. In step 644 (Fig. 6B or 7B) , the power
transmitter 210 completes the wireless communication with the
power receiver 430 at a third thread. In step 744 (Fig. 6B or
7B) , the power receiver 430 completes the wireless
communication with the power transmitter 210.
[0136] Fig. 11 illustrates, in Fig. lor 2, another example
of a power transmission procedure when transmitting power to
the two power receivers 230 and 330 which receive power
simultaneously from one- power transmitter 210 or 310 in
accordance with the processing procedure of Figs. 7A and 7B.
For purposes of explanation, it is assumed that the power
transmission and power reception are performed between the
power transmitter 210 and the power receivers 230 and 330.
[0137] The power transmitter 210 executes step 516 of Fig.
5A at a first thread and transmits the inquiry signals. The
power receiver 230, in step 536, receives the inquiry signals
from the power transmitter 210. After that, the power
transmitter 210 executes step 802, that is, the processing of
steps 602 to 638 (Figs. 7A and 7B) at a first thread, and during
that period, the power receiver 230 executes step 902, that is,
the processing of steps 702 to 740 (Figs. 7A and 7B).
[0138] After that, the power transmitter 210 executes step
516 (Fig. 5A) at a second thread during the period when it
transmits power to the power receiver 230 at a first thread,
and transmits the inquiry signals. The power receiver 330, in
step 536, receives the inquiry signals from the power
transmitter 310. After that, the power transmitter 210

executes step 862, that is, the processing of authentication
and the wireless communication establishment of steps 602 to
610 (Fig. 7A) at a second thread, and during that period, the
power receiver 330 executes step 962, that is, the processing
of the wireless communication establishment of step 702 (Fig.
7A) .
[0139] The power transmitter 210 executes step 612 (Fig.
7A) at a second thread during the period when it transmits power
to the power receiver 230 at a first thread, and transmits
information which indicates that the simultaneous power
reception has been started, to the power receiver 230. In step
712 (Fig. 7A) , the power receiver 330 receives the information
which indicates the starting-up of the simultaneous power
reception by the power transmitter 210.
[0140] After that, the power transmitter 210 executes step
620 (Fig. 7A) at a second thread, transmits the power
transmitting condition to the power receiver 330, and receives
the power receiving condition from the power receiver 330. The
power receiver 330 executes step 720, transmits the power
receiving condition to the power transmitter 210, and receives
the power transmitting condition from the power transmitter
210.
[0141] The power transmitter 210 executes step 622 (Fig.
7A) of step 872 at first and second threads, transmits
information which indicates to temporarily transmit power to
the power receiver 230, and transmits power temporarily or
transiently via the power transmitting resonant coil 226. In
step 722 of steps 972 and 982 (Fig. 7B), each of the power
receivers 230 and 330 receives information which indicates that
the temporary power transmission is performed from the power
transmitter 210, fetches the power via the power receiving
resonant coil 246, and temporarily or transiently receives
power.
[0142] The power transmitter 210 executes step 624 (Fig.
7B) of step 872 at first and second threads, transmits

information of the power transmission state to the power
receivers 230 and 330, and receives information of the power
reception state from the power receivers 230 and 330. In step
724 (Fig. 7B) of steps 972 and 982, each of the power receivers
230 and 330 transmits information of the power reception state
to the power transmitter 210 and receives information of the
power transmission state from the power transmitter 210.
[0143] After that, the power transmitter 210 repeatedly
executes step 872, that is, the processing of power transmission
and authentication of steps 622 to 638 (Fig. 7B) at first and
second threads, and during that period, the power receivers 230
and 330 repeatedly execute steps 972 and 982, that is, the
processing of the power reception of steps 722 to 740 (Fig. 7B) .
[0144] Accordingly, the power transmitter 210 transmits
power to the power receiver 330 at a second thread during the
time when it transmits power to the power receiver 230 at a first
thread.
[0145] After that, the power transmitter 210 executes step
640 (Fig. 7B) at a second thread, and transmits information
which indicates the stopping of the power transmission to the
power receiver 330. In step 741 (Fig. 7B) , the power receiver
330 completes the power reception in response to the reception
of the information which indicates the stopping of the power
transmission. In step 644 (Fig. 7B) , the power transmitter 210
completes the wireless communication with the power receiver
330 at a second thread. In step 744 (Fig. 7B), the power
receiver 330 completes the wireless communication with the
power transmitter 210.
[0146] After that, the power transmitter 210 executes step
804, that is, the processing of power transmission and
authentication of steps 622 to 638 (Fig. 7B) at a first thread,
and during that period, the power receiver 230 executes step
904, that is, the processing of the power reception of steps
722 to 740 (Fig. 7B) . In steps 622 and 722 (Fig. 7B) , the power
transmitter 210 and the power receiver 230 perform temporary

power transmission and temporary power reception again.
[0147] After that, the power transmitter 210 executes step
640 (Fig. 7B) at a first thread, and transmits information which
indicates the stopping of power transmission to the power
receiver 230. In step 741 (Fig. 7B), the power receiver 230
completes the power reception in response to the reception of
the information which indicates the stopping of the power
transmission. In step 644 (Fig. 7B) , the power transmitter 210
completes the communication with the power receiver 230 at a
first thread. In step 744 (Fig. 7B), the power receiver 230
completes the communication with the power transmitter 210.
[0148] Figs. 12A to 12C respectively illustrate another
example of a power transmission procedure when transmitting
power to any of the power receivers 230, 330, and 430 from the
one or two power transmitters out of the plurality of the power
transmitters 210, 310, and 410 according to the processing
procedure of Fig. 6A or 6B in Fig. 2. In Fig. 12A, the two power
transmitters 210 and 310 transmit power simultaneously to one
power receiver 230.
[0149] In reference to Fig. 12A, the power transmitter 210
executes step 516 of Fig. 5A and transmits the inquiry signals.
The power receiver 230 executes step 536 at a first thread, and
receives the inquiry signals from the power transmitter 210.
After that, the power transmitter 210 executes step 806, that
is, the processing of steps 602 to 638 (Figs. 6A and 6B) , and
during that period, the power receiver 230 executes step 906,
that is, the processing of steps 702 to 740 (Figs. 6A and 6B) .
[0150] When the power receiver 230 receives power from the
power transmitter 210 at a first thread, the other power
transmitter 310 executes step 516 of Fig. 5A and transmits the
inquiry signals. The power receiver 230 executes step 536 at
a second thread, and receives the inquiry signals from the power
transmitter 310. After that, the power transmitter 310
executes step 816, that is, the processing of steps 602 to 638
(Figs. 6A and 6B), and during that period, the power receiver

330 executes step 916, that is, the processing of steps 702 to
740 (Figs. 6A and 6B) at a second thread. With this,
simultaneous power transmission from the two power transmitters
210 and 310 to the power receiver 230 is performed.
[0151] At a second thread, in step 720 of step 916 (Fig.
6A) , the power receiver 230 transmits a power receiving
condition which includes information indicating that the power
reception is currently being performed from the other power
transmitter 210 and the current power receiving resonant
frequency fr to the power transmitter 310. The power
transmitter 310, in step 621 of step 816, judges whether or not
the power transmitting condition and the current power
receiving condition fit together or conform. The power
receiver 210, at a second thread, executes step 721 (Fig. 6A)
and judges whether or not the power transmitting condition and
the current power receiving condition fit together or conform.
[0152] The power transmitter 310, in step 626 of step 816
(Fig. 6B) , judges whether or not the power transmission state
of the power transmitter 310 and the power reception state of
the power receiver 230 are normal. The power receiver 230, at
a second thread, in step 726 of step 916 (Fig. 6B) , judges whether
or not the power transmission state of the power transmitter
310 and the power reception state of the power receiver 230 are
normal. For example, when the power transmission efficiency
k is lower than the threshold value kth due to inconsistent phases
of the coupling magnetic field of the two power transmitters
210 and 310, it is judged as abnormal, and the power transmission
(simultaneous power transmission) from the power transmitter
310 to the power receiver 210 is stopped (Fig. 6B, steps 640
and 741) .
[0153] In Fig. 12A, in the power transmitters 210 and 310
as well as the power receiver 230, it is assumed that the power
transmitting condition and the power receiving condition are
judged to fit together in steps 621 and 721 (Fig. 6A) , and that
the temporary power transmission and the temporary power

reception are judged to be normal in steps 626 and 726 (Fig.
6A) . In this case, the simultaneous power transmission in step
628 (Fig. 6B) and the power reception in step 728 (Fig. 6B) are
started and continued.
[0154] After that, when the power transmission efficiency
kt or the power reception efficiency kr falls, due to the change
in the power transmission and power reception environment, due
to the change in the power transmission and power reception
environment caused, for example, by the operation of the power
receiver 230, or due to, for example, the power receiver 430
entering into the power transmissible range of the power
transmitter 310, it is judged that the power reception is
impossible or that the power reception is stopped (steps 636,
638, and 740).
[0155] Therefore, the power transmitter 310, in step 640
(Fig. 6B), transmits information which indicates the stopping
of the power transmission to the power receiver 230. The power
receiver 230, in step 741 (Fig. 6B) , at a second thread, responds
to the reception of information which indicates the stopping
of the power transmission and completes the power reception.
In step°644 (Fig. 6B) , the power transmitter 310 completes the
communication with the power receiver 230. In step 744 (Fig.
6B), the power receiver 230 completes the communication with
the power transmitter 310. After that, the power transmission
from the power transmitter 210 to the power receiver 230 is
continued.
[0156] In reference to Fig. 12B, subsequently, the power
transmitter 310 executes step 516 (Fig. 5A) and transmits the
inquiry signals. The power receiver 330, in step 536 (Fig. 5A) ,
receives the inquiry signals from the power transmitter 310.
Subsequently, the power transmitter 310 executes step 826, that
is, the processing of steps 602 to 638 (Figs. 6A and 6B), and
during that time, the power receiver 330 executes step 926, that
is, the processing of steps 702 to 740 (Figs. 6A and 6B).
[0157] Subsequently, the power transmitter 310, in step

640 (Fig. 6B) , transmits information which indicates the
stopping of the power transmission to the power receiver 330.
In step 741 (Fig. 6B), the power receiver 330 responds to the
reception of information which indicates the stopping of the
power transmission, and completes the power reception.
In step 644 (Fig. 6B) , the power transmitter 310 completes
the communication with the power receiver 330. In step 744 (Fig.
6B), the power receiver 330 completes the communication with
the power transmitter 310.
[0158] Subsequently, the power transmitter 210, in step
640 (Fig. 6B) , transmits information which indicates the
stopping of the power transmission to the power receiver 230.
The power receiver 230, in step 741 (Fig. 6B) , responds to the
reception of information which indicates the stopping of the
power transmission, and completes the power reception. In step
644 (Fig. 6B) , the power transmitter 210 completes the
communication with the power receiver 230. In step 744 (Fig.
6B), the power receiver 230 completes the communication with
the power transmitter 210.
[0159] In reference to Fig. 12C, the power transmitter 310
executes step 516 (Fig. 5A) and transmits the inquiry signals.
The power receiver 430, in step 536 (Fig. 5A), receives the
inquiry signals from the power transmitter 310. Subsequently,
the power transmitter 310 executes step 836, that is, the
processing of steps 602 to 638 (Figs. 6A and 6B), and during
that time, the power receiver 430 executes step 936, that is,
the processing of steps 702 to 740 (Figs. 6A and 6B).
[0160] After that, when the power transmission efficiency
k falls due to, for example, a change in the power transmission
and power reception environment, the power transmitter 310, in
step 640 (Fig. 6B) , transmits information which indicates the
stopping of the power transmission to the power receiver 430.
The power receiver 430, in step 741 (Fig. 6B) , responds to the
reception of information which indicates the stopping of the
power transmission and completes the power reception. In step

64 4 (Fig. 6B) , the power transmitter 310 completes the
communication with the power receiver 430. In step 744 (Fig.
6B), the power receiver 430 completes the communication with
the power transmitter 310.
[0161] Subsequently, the power transmitter 410 executes
step 516 (Fig. 5A) and transmits the inquiry signals. The power
receiver 430, in step 536 (Fig. 5A) , receives the inquiry
signals from the power transmitter 410. Subsequently, the
power transmitter 410 executes step 838, that is, the processing
of steps 602 to 638 (Figs. 6A and 6B), and during that time,
the power receiver 4 30 executes step 938, that is, the
processing of steps 702 to 740 (Figs. 6A and 6B).
[0162] Subsequently, the power transmitter 410, in step
640 (Fig. 6B) , transmits information which indicates the
stopping of the power transmission to the power receiver 430.
In step 741 (Fig. 6B), the power receiver 430 responds to the
reception of the information which indicates the stopping of
the power transmission, and completes the power reception.
In step 644 (Fig. 6B) , the power transmitter 410 completes
the communication with the power receiver 430 . In step 744 (Fig.
*6B), the power receiver 430 completes the communication with
the power transmitter 410.
[.0163] In Figs. 12A to 12C, in combinations of Figs. 10A
and 10B, or Figs. 11A and 11B, each of the plurality of the power
transmitters 210, 310, and 410 may simultaneously transmit
power to a plurality of the power receivers 230, 330, and 430
and each of the plurality of the power receivers 230, 330, and
430 may simultaneously receive power from the plurality of the
transmitters 210, 310, and 410.
[0164] As mentioned above, according to the embodiments,
on the basis of the respective power transmitting conditions
and power receiving conditions, the power may be transmitted
from any one or more of the power transmitters to any one or
more of the power receivers, and for the power reception amount
in respective power receivers, the power fees may be calculated.

[0165] All examples and conditional language recited
herein are intended for pedagogical purposes to aid the reader
in understanding the invention and the concepts contributed by
the inventor to furthering the art, and are to be construed as
being without limitation to such specifically recited examples
and conditions, nor does the organization of such examples in
the specification relate to a depicting of the superiority and
inferiority of the invention. Although the embodiments of the
present invention have been described in detail, it is to be
understood that the various changes, substitutions, and
alterations could be made hereto without departing from the
spirit and scope of the invention.
Explanation of letters or numerals
[0166] 20, 22 Power supply system
40 Power transmission line
50 Network
202, 302 Power meter
304, 404 Communication device
210, 310 power transmitter
230, 330 Power receiver
260, 360 Device using power
100 Contractor information management server

We Claim:
1. A power supply system comprising:
at least one power transmitter that transmits first
identification information and a power transmitting
condition to a power receiver, receives second
identification information and a power receiving condition
from the power receiver, wirelessly transmits power to the
power receiver on the basis of the power transmitting
condition and the power receiving condition, and generates
power transmission amount information indicating a power
amount wirelessly transmitted to the power receiver;
at least one power receiver that receives the first
identification information and the power transmitting
condition from a corresponding power transmitter, transmits
the second identification information and the power
receiving condition to the corresponding power transmitter,
wirelessly receives power from the corresponding power
transmitter on the basis of the power transmitting condition
and the power receiving condition, generates power reception
amount information indicating a power amount wirelessly
received, and transmits the first identification information,
the second identification information, and the power
reception amount information via a network; and
an information processing device that manages the
power transmission amount information and the power
reception amount information by a wireless power feed of a
contractor, the information processing device receiving the
first identification information, the second identification
information, and the power transmission amount information
via a network, and receiving the second identification
information and the power reception amount information via
a network.
2. The power supply system according to claim 1, wherein:
the at least one power transmitter temporarily transmits

power sequentially and wirelessly to the at least one power
receiver with different resonant frequencies when the power
transmitting condition and the power receiving condition of
the at least one power receiver fit together;
the at least one power transmitter receives information
indicating a power reception state which includes a received
power in the different resonant frequencies from the at least
one power receiver, generates a transmitted power in the
different resonant frequencies in the at least one power
transmitter, determines power transmission efficiency in the
different resonant frequencies on the basis of the
transmitted power and the received power in the different
resonant frequencies, determines one resonant frequency of
the different resonant frequencies on the basis of the power
transmission efficiency, transmits information indicating
the determined one resonant frequency to the at least one
power receiver, wirelessly transmits power to the at least
one power receiver with the determined one resonant
frequency; and
the at least one power receiver receives information
indicating the determined one resonant frequency, and
receives power with the determined one resonant frequency
from the at least one power transmitter.
3. The power supply system according to claim 1, wherein:
the at least one power receiver is a plurality of power
receivers;
the at least one power transmitter temporarily transmits
power sequentially and wirelessly to the plurality of the
power receivers which simultaneously receive power with
different resonant frequencies when the power transmitting
condition and the respective power receiving conditions of
the plurality of the power receivers fit together;
the at least one power transmitter receives information
indicating the power receiving condition which includes the

received power in the different resonant frequencies from
the plurality of the power receivers in the temporary power
transmission, generates the transmitted power in the
different resonant frequencies in the at least one power
transmitter, determines the power transmission efficiency
in the different resonant frequencies on the basis of the
transmitted power and the received power in the different
resonant frequencies, determines one resonant frequency of
the different resonant frequencies on the basis of the power
transmission efficiency, transmits information indicating
the determined one resonant frequency to the plurality of
the power receivers, transmits power to the plurality of the
power receivers with the determined one resonant frequency;
and
the plurality of the power receivers receives information
indicating the determined one resonant frequency, and
simultaneously receives power with the determined one
resonant frequency from the at least one power transmitter.
4. The power supply system according to claim 1, wherein:
the at least one power receiver is a' plurality of power
receivers;
the at least one power transmitter temporarily transmits
power with different resonant frequencies sequentially and
wirelessly to the plurality of the receivers which
simultaneously receive power when the power transmitting
condition and the respective power receiving conditions of
the plurality of the power receivers fit together;
the at least one power transmitter receives information
indicating a power reception state which includes a received
power in the different resonant frequencies from the
plurality of power receivers in the temporary power
transmission, generates a transmitted power in the different
resonant frequencies in the at least one power transmitter,
determines a set of power transmission efficiencies in the

different resonant frequencies on the basis of the
transmitted power and the received power in the different
resonant frequencies, and completes the power reception by
some of the plurality of power receivers with a low priority
when the set of power transmission efficiencies is not
greater than a threshold value, temporarily transmits power
again with different resonant frequencies sequentially and
wirelessly to the other power receiver of the plurality of
power receivers which simultaneously receive power,
determines one resonant frequency of the different resonant
frequencies by which a power transmission efficiency higher
than the threshold value is obtained, determines one resonant
frequency of the different resonant frequencies on the basis
of the high power transmission efficiency, transmits
information indicating the determined one resonant frequency
to the other power receiver, transmits power to the other
power receiver with the determined one resonant frequency;
and
the other power receiver receives information indicating
the determined one resonant frequency, and simultaneously
receives power with the determined one resonant frequency
from the at least one power transmitter.
5. The power supply system according to any one of claims
1 to 4, wherein the information processing device, on the
basis of both the power transmission amount information and
the power reception amount information, calculates a fee with
respect to a value of a ratio covered by a contractor between
a power amount of the power transmission amount information
and a power amount of the power reception amount information
as a fee with respect to the power reception amount
information of the second identification information.
6. The power supply system according to any one of claims
1 to 4, wherein:

the at least one power transmitter is a plurality of power
transmitters;
the plurality of power transmitters wirelessly and
temporarily transmits power to the at least one power
receiver when the power transmitting condition of the
plurality of power transmitters and the power receiving
condition of the at least one power receiver fit together;
the at least one power receiver receives information
indicating the power transmitting condition which includes
the transmitted power from the plurality of the power
transmitters in the temporary power transmission, generates
the received power in the at least one power receiver,
determines the power reception efficiency on the basis of
the transmitted power and the received power, transmits
information indicating a continuation or start of the power
reception to the plurality of the power transmitters when
the power reception efficiency is higher than a threshold
value, and simultaneously receives power from the plurality
of power receivers.
7. The power supply system according to claim 6, wherein
the information processing device, on the basis of the power
transmission amount information of the at least one power
transmitter and the power reception amount information of
the plurality of power receivers, calculates a fee with
respect to a value of a ratio covered by each contractor
between a power amount of the power transmission amount
information and a power amount of the plurality of pieces
of power reception amount information as each of fees with
respect to each piece of the power reception amount
information of the plurality of power receivers.
8. The power supply system according to any one of claims
1 to 7, wherein the power transmitter comprises:
a transmission and reception unit that transmits the

first identification information and the power transmitting
condition to the first and second power receivers as the at
least one power receiver, and receives the second
identification information and the third identification
information, the first and the second power receiving
conditions as the power receiving condition, and the first
and the second received power information, respectively,
from the first and second power receivers;
a power transmitting unit that includes a power
transmitting resonant coil and a power supplying unit
supplying power of an induced current to the power
transmitting resonant coil; and
a controlling unit that controls the power transmitting
unit in such a way as to wirelessly transmit power to the
first and the second power receivers on the basis of the power
transmitting condition and the first and the second power
receiving conditions when the power transmitting condition
and the first and the second power receiving conditions fit
together, generates the transmitted power information of the
power transmitting unit and the power transmission amount
information, controls power transmission to the second power
receiver on the basis of the transmitted power information
and the first and the second power reception amount
information, and supplies the first identification
information, the second identification information, the
third identification information, and the power transmission
amount information to the communication device.
9. The power supply system according to any one of claims
1 to 8, wherein
the power receiver comprises:
a first transmitting and receiving unit that receives the
first identification information and the third identification
information, the first and the second power transmitting
:onditions, and the first and the second received power

information respectively from the first and the second power
transmitters as the at least one power transmitter, and
transmits the second identification information and the power
receiving condition to the first and the second power
transmitters;
a power receiving unit that has a power receiving resonant
coil and a power fetching unit fetching power of an induced
current of the power receiving resonant coil and wirelessly
receives power from the first and the second power transmitters
via the power receiving resonant coil;
a controlling unit that controls the power receiving unit
in such a way as to wirelessly receive power from the first and
the second power transmitters on the basis of the first and the
second power transmitting conditions and the power receiving
condition when the first and the second power transmitting
conditions and the power receiving condition fit together,
generates the received power information of the power receiving
unit and the power reception amount information, and controls
power reception from the second power transmitter on the basis
of the first and the second transmitted power information and
the received power information; and
a second transmitting and receiving unit that transmits
the second identification information and the power reception
amount information via a network.
10. The power supply system according to any one of claims 1
to 9, further comprising at least one communication device that
transmits second identification information and power
transmission amount information via a network.
11. A power transmitter comprising:
a transmitting and receiving unit that transmits first
identification information and a power transmitting
condition to first and second power receivers, and receives
second and a third identification information, first and a

second power receiving conditions, and first and a second
received power information respectively from the first and
the second power receivers;
a power transmitting unit that includes a power
transmitting resonant coil and a power supplying unit
supplying power of an induced current to the power
transmitting resonant coil; and
a controlling unit that controls the power transmitting
unit in such a way as to wirelessly transmit power to the first
and the second power receivers on the basis of the power
transmitting condition and the first and the second power
receiving conditions, when the power transmitting condition and
the first and the second power receiving conditions fit together,
generates the transmitted power information of the power
transmitting unit and a power transmission amount information
indicating the wirelessly transmitted power amount, controls
power transmission to the second power receiver on the basis
of the transmitted power information and the first and the
second received power information, and supplies the first
identification information, the second identification
information, the third identification information, and the
power transmission amount information to a communication
device.
12. A power receiver comprising:
a first transmitting and receiving unit that receives
first and second identification information, first and second
power transmitting conditions, and first and second received
power information respectively from first and second power
transmitters, and transmits third identification information
and a power receiving condition to the first and second power
transmitters;
a power receiving unit that has a power receiving resonant
coil and a power fetching unit fetching power of an induced
current of the power receiving resonant coil and wirelessly

receives power from the first and second power transmitters via
the power receiving resonant coil;
a controlling unit that controls the power receiving unit
in such a way as to wirelessly receive power from the first and
second power transmitters on the basis of the first and second
power transmitting conditions and the power receiving condition
when the first and second power transmitting conditions and the
power receiving condition fit together, generates received
power information of the power receiving unit and power
reception amount information indicating the wirelessly
received power amount, and controls power reception from the
second power transmitter on the basis of the first and second
transmitted power information and the received power
information; and
a second transmitting and receiving unit that transmits
the third identification information and the power reception
amount information via a network.