DESC:TECHNICAL FIELD
[0001] The present disclosure relates to power transmission and motor speed control. In particular, embodiments of present disclosure relate to transmission of high power of up to several hundred watts as well as speed control data/signal for running a distant motor over a single, common transmission line, the return path being the ‘Neutral’ wire running independently to the device in use.

BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] A single-wire transmission line (or single wire method) is a method of transmitting electrical power or signals using only a single electrical conductor. This is in contrast to a pair of wires providing a complete circuit that is normally used for the purpose, or a cable likewise containing (at least) two conductors for that purpose. Existing transmission interfaces such as I2C, SPI, SMBUS require at least two wires, of which one is for data transmission and other for clock transmission. If a single wire is capable of achieving both data and clock transmission, pin number can be reduced besides reduction in cost of cabling.
[0004] Variable speed DC motors are used for various applications such as but not limited to a blower motor for heat and ventilation systems in motor vehicles. The motor speed control can be performed in a variety of different ways. Common methods include: voltage dropping resistors, high current rheostats, linear voltage amplifiers and pulse width modulation (PWM). Conventional power converters provide an adjustable voltage and frequency to an output through a Pulse Width Modulated (PWM) voltage source inverter drive. Voltage dropping resistors, high current rheostats and linear voltage amplifiers are becoming less desirable due to lower power efficiency and concerns regarding conservation of electrical power. Thus, PWM speed control is preferred over other methods due to its high power efficiency. PWM speed control switches provide motor with voltage at a fixed frequency while varying applied duty cycle. Motor typically achieves speed that is directly proportional to percent duty cycle. For example, 50% duty cycle may correlate to 50% of maximum motor speed. However, it may also be set to achieve some other speed value for the same 50% duty cycle. Generally, PWM control frequency must be greater than 20 kHz to eliminate audible resonance that may be produced by the motor.
[0005] A typical power converter for generation of PWM signal is a switching apparatus having two or more power semiconductor devices such as power semiconductor switches, which can be abbreviated as power switches. A power switch can, for example, be implemented by an insulated-gate bipolar transistor (IGBT) or a metal-oxide-semiconductor field-effect transistor (MOSFET). Power switch irrespective of type used has to be fed with control signal to get desired result.
[0006] In addition to motors, portable consumer electronic devices typically include specialized integrated circuits to control power generally referred to as power control devices. Different power control circuits are available to function as voltage regulators, current sources and switches and are used to operate a wide range of subsystems such as LCDs, LEDs, speakers, and motors. In many cases, power control circuits are implemented as discrete standalone devices such that a single electronic device (e.g., cellphone) may include a large number of different power control devices. In such cases, controlling different devices becomes a significant problem.
[0007] Also, two wire electrical circuits can be commonly found, wherein the process of current flowing from the generator to the load uses one wire, and then back to the generator is done by the other wire. However, it is known that free access electrons move relatively slowly, and that electrical energy is transmitted at the speed of light. In reality, today’s wired electrical systems use two or more channels (wires) for transmitting energy. It is known that active (real) power does not return from the load to the generator. From this point of view, perhaps a second channel in electrical systems is, therefore, not needed. In other words, line of an electrical system can be a single wire (or One-Way System).
Under above scenario, it would be advantageous if single wire used to transmit power/electrical energy to a device such as motors, power control circuits etc. can also carry the corresponding control signal as it will lead to reduced number of wires, pins with associated cost savings.
[0008] Therefore, there is a need of a system that allows power along with control signal to be transmitted to a remote end by a single wire with return wire being 'neutral' of AC power supply.

OBJECTS OF THE INVENTION
[0009] It is an object of the present disclosure to simplify and reduce costs of installing devices by providing an apparatus for transmission of power and single wire transmission of signals to and from remotely located devices.
[00010] It is an object of the present disclosure to provide method for transmission of high power.
[00011] It is yet another object of the present disclosure to transmit high power of several watts for running a high power device using AC input power while carrying digital speed control signal over same power transmission line.
[00012] It is yet another object of the present disclosure to transmit power to remote end by single wire with return wire being ‘neutral’ of AC power supply.
[00013] It is yet another object of the present disclosure to carry AC power high voltage input to power up device at receiver end using same transmission wire.
[00014] Additional objects and features of the disclosure will be set forth in part in the description which follows and in part will become apparent to those skilled in the art upon examination of the following or may be learned from practice of the invention.

SUMMARY
[00015] Embodiments of the present disclosure relate to an apparatus, system, and method of single wire transmission of power to run a high power device using input from AC voltage wherein the single wire also carries command and data signal. In an aspect the disclosed method can work on all low and mid-range frequencies of AC power supply and DC power systems. In another aspect the method of the present disclosure results in reduction of cost of electrical lines and reduces number of pins in transmission system.
[00016] In pursuit to forgoing objective, one aspect of the present disclosure provides apparatus and method for interface between power signal and control signal so that both can be transmitted by a single wire. Wherein the apparatus comprises a transmitter configured to receive AC low frequency power supply, and taps the AC low frequency input supply to get DC low power signal. DC low power signal can be further processed at the transmitter to generate control signal in response to user selected parameter to control a target device such as speed of a DC motor. The generated control signal can be merged with high/ low voltage AC input and transmitted to remote device using single wire, leading to a mixed signal having control signal generated by transmitter in response to user input and AC input power supply, being available on power bus..
[00017] In another aspect, the apparatus of the present disclosure can further comprise of a receiver configured to receive mixed signal having control signal and AC input from the transmitter and converting the mixed signal to generate DC voltage corresponding to motor operating DC voltage. Also mixed signal can be buffered, filtered, amplified, and/or inverted, if required, based on transmission parameters, including but not limited to signal strength, length of transmission wire, and signal to noise ratio (SNR) to get control signal. Control signal can then be converted to a pulse width modulated (PWM) signal to generate a desired percent duty cycle that is required for specific speed requirement, which can enable driving of motor electronics at desired speed based on motor characteristics and/or drive electronics properties.
[00018] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.
[00019] The preceding paragraphs present a simplified summary of the invention in order to provide a basic understanding of some of its aspects. This summary is not an extensive overview of the invention and is intended neither to identify key or critical elements of the invention nor to delineate its scope. The primary purpose of this summary is to present some concepts of the invention in a simplified form as a prelude to the more detailed description that is presented later.

BRIEF DESCRIPTION OF THE DRAWINGS
[00020] Figure 1 illustrates an exemplary block diagram depicting principle of single wire transmission of power and control signal in accordance with embodiments of the present disclosure.
[00021] Figure 2 illustrates an exemplary power control system for controlling speed of motor with single wire transmission of power and control signal in accordance with embodiments of the present disclosure.
[00022] Figure 3 illustrates an alternate receiver configuration of single wire transmission of power and control signal in accordance with embodiments of the present disclosure.
[00023] Figure 4(a) illustrates an exemplary flow chart of transmitter side method for controlling speed of a motor in accordance with embodiments of the present disclosure.
[00024] Figure 4(b) illustrates an exemplary flow chart of receiver side method for controlling speed of a motor in accordance with embodiments of the present disclosure.

DETAILED DESCRIPTION
[00025] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those of ordinary skill in the art. Moreover, all statements herein reciting embodiments of the invention, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e., any elements developed that perform the same function, regardless of structure).
[00026] The following description refers to elements or features being “connected” or “coupled” together. As used herein, “connected” may refer to one element/feature being mechanically joined to (or directly communicating with) another element/feature, and not necessarily directly. Likewise, “coupled” may refer to one element/feature being directly or indirectly joined to (or directly or indirectly communicating with) another element/feature, and not necessarily mechanically. However, it should be understood that although two elements may be described below, in one embodiment, as being “connected,” in alternative embodiments similar elements may be “coupled,” and vice versa. Thus, although the schematic diagrams shown herein depict example arrangements of elements, additional intervening elements, devices, features, or components may be present in an actual embodiment.
[00027] One should appreciate that the disclosed techniques provide many advantageous technical effects including configuring devices to present one or more user interfaces allowing users to manipulate or manage a remote experience.
[00028] Further, various components and features described herein may be referred to using particular numerical descriptors, such as first, second, third, etc., as well as positional and/or angular descriptors, such as horizontal and vertical. However, such descriptors may be used solely for descriptive purposes relating to drawings and should not be construed as limiting, as the various components may be rearranged in other embodiments. It should also be understood that Figures 1-6 are merely illustrative and may not be drawn to scale.
[00029] Although the discussion below refers to power converter assembly as a direct current-to-alternating current (DC/AC) inverter (i.e., a DC-to-AC inverter), it should be understood that in other embodiments, aspects of the present invention may be used in conjunction with direct current-to-direct current (DC/DC) converters, as will be appreciated by one skilled in the art.
[00030] Embodiments of the present invention generally involve a single wire power/data transmission mechanism configured to transmit high power for running a device using AC input power while carrying speed control and data signals/pulses over the same single wire, also interchangeably referred to as power transmission line. The proposed circuit architecture therefore enables transmission of a mixed signal having both power (from AC power supply) and speed control signals (from pulse generator) from a transmittor to a receiver circuit.
[00031] Embodiments of the present invention involve single wire transmission interface including a transmitter and a receiver. Although not shown, transmitter and/or receiver may include various passive electronic components such as inductors, resistors, capacitors, and diodes, as is commonly understood.
[00032] Figure 1 generally illustrates the principle of invention showing a single wire transmission interface 100 of the present invention, which can include a source for power supply 102, a transmitter 104, a receiver 106and a motor 108. Input power signal from the source 102 can be low AC/DC power signal or high AC/DC power signal. According to one embodiment, one aspect of the present disclosureprovides a single wire transmission interface 100 comprising a source 102 configured to produce AC low frequency power supply, and a transmitter 104 that can tap AC low frequency input power signal to convert to DC low power signal, which can be further processed for generating command signal for speed selection for motor based on user selected speed requirement.
[00033] According to one embodiment, in order to enable speed selection, transmitter of the present disclosurecan include a speed selector switch that generates ‘n’ steps of DC voltage from DC power supply, wherein each step can be configured to provide a DC voltage potential corresponding to different possible speeds of the motor. Transmitter 104 of the present disclosurecan further include a pulse generator configured to generate a defined number of pulses(referred to as pulse based speed control signal or speed control pulse data or simply as pulse data or speed control signal and all these terms used interchangeably hereinafter) based on input DC voltage potential, wherein the generated pulse signals can be transmitted by transmitter 104 in conjunction with high voltage AC power signal, leading to a mixed signal having pulses from pulse generator and AC input power supply, being available on power bus.
[00034] In another embodiment of the present disclosure, single wire transmission interface 100can further include a receiver 106 configured to receive mixed signals having speed control pulses and AC power input supply from transmitter 104,and further configured to convert the received mixed signal to generate DC voltage based on motor operating DC voltage and low DC voltage for operating the electronics on the receiver end. Further, pulsed signal from the transmitter is separated from the transmitted AC power voltage. Pulsed signal can then be filtered, amplified, or inverted, if required based on transmission parameters including but not limited to signal strength, length of transmission wire, and signal to noise ratio (SNR). Pulsed signal can also be converted to a pulse width modulated (PWM) signal to generate a desired percent duty cycle that is required for specific speed requirement, which can enable driving of motor electronics at desired speed based on motor characteristics and/or drive electronics properties.
[00035] Figure 2 illustrates an exemplary power control system 200 incorporating embodiments of the present disclosure. The power control system 200 generally includes a transmitter 210 and a receiver 220. Transmitter 210 can be operatively coupled with receiver 220 by means of single wire, which is configured to carry both power as well as speed control signals in the form of pulses. In one aspect, to meet the requirement of signal for speed control, input AC power supply can be tapped and converted into a low voltage DC by low voltage DC power supply unit 212, wherein the DC supply can then be transferred from low voltage DC power supply unit 212 to a speed selection switch 214. In an instance, low voltage DC power supply unit 212 can get input from AC low frequency supply with live (L) and neutral (N) ranging from 85V to 265VAC and from 45 to 65Hz frequency.
[00036] In another aspect, speed selection switch/unit 214can be configured to provide 'n' steps of DC voltage each corresponding to a desired selectable speed of DC motors such as 236a and 236b, collectively referred to as motor 236 hereinafter. Such 'n' steps of DC voltage can be determined as function of motor speeds required for operating the motor and machine coupled thereto. Each of the ‘n’ steps can incorporate a suitable delta in voltage values and can be implemented by means of a simple low power potential divider or other known means. In implementation, each of the desired motor speed can be configured to correspond to unique DC voltage potential, such as voltage V1 for lowest speed, V2 for next to lowest, and Vn for the highest speed desired. Once the required DC voltage potential is determined based on desired motor speed, appropriate step can be generated by the potential divider and the speed selection unit 214 using input DC voltage. Any number of speeds can be incorporated and supported by the speed selection unit 214.
[00037] In an aspect, DC voltage potential generated by speed selection unit 214 can be received at a pulse generation unit 216 configured to generate a plurality of pulses that are representative of applied input voltage, V1, V2....Vn. In an exemplary embodiment, one pulse can be generated for voltage potential V1, two pulses can be generated for voltage potential V2, and “n” pulses can be generated for voltage potential Vn. It should be appreciated that above mode of pulse generation is completely exemplary and any other number of pulses i.e. pulse based speed control signal can be generated or any other scheme of pulses and its generation for a given voltage potential received from speed selection unit 214 can be followed and all such variations are within the scope of the present disclosure.
[00038] In another aspect, transmitter 210 includes an OR functional unit 218 configured to receive pulse based speed control signal from the pulse generation unit 216 and AC power supply from AC power source and mix pulse based speed control signal from unit 216 with input AC power supply to achieve a mixed signal. OR functional unit 218 may further be configured to perform an OR logical function between the AC power supply and the pulses such that both pulse based speed control signal and AC power supply are transmitted together. In another alternate embodiment, in an absence of pulse based speed control signal from pulse generation unit 216, normal high voltage AC input can pass through the OR functional unit 218. In a further embodiment, when a pulse or a stream of pulses are entered into the 'OR' functional unit 218 from the pulse generation unit 216, unit 218 can momentarily block transmission of high voltage AC power supply to the receiver 220 and during that period can pass through the pulse data sent by the unit 216. OR functional unit 218 can alternatively be configured to pass puls data sent by unit 216 to the receiver 220, with or without high voltage AC power supply.
[00039] According to one embodiment, mixed signal including high voltage AC and speed control pulse data can be received by receiver 220 over a single wire, say live wire, wherein the neutral wire (N) of the high voltage AC may or may not be running along with the live wire (L). Any other configuration can also be incorporated and would be within the scope of the present disclosure. In an alternate embodiment for instance, a common neutral can also take an alternate path while running upto the motor to be speed controlled as it is not directly involved in speed data (pulse) transmission.
[00040] According to one embodiment, received mixed signal can be processed and converted into DC voltage of desired value, wherein the output DC voltage can be based on motor operating DC voltage. Converted DC voltage may then be fed directly as motor supply. In an implementation, conversion of mixed signal into desired DC voltage can be performed using a low/high voltage DC unit 222 having one or a combination of SMPS, an analogue power supply, and a power factor corrected electronics. In another embodiment, voltage generated by unit 222 can be tapped to generate low voltage power supply, if required, by feeding DC voltage from unit 222 to low voltage DC unit 224 and using a DC to DC voltage converter. Such low voltage DC can be used to meet requirement of entire electronics in the receiver section 220.
[00041] Switched-mode power supply (SMPS), also commonly referred to as a switcher can be used for DC voltage conversion and processing, wherein SMPS is basically an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a source, such as mains power, to a load, such as a personal computer, while converting voltage and current characteristics. Unlike a linear power supply, pass transistor of a switching-mode supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. Ideally, a switched-mode power supply dissipates no power. Voltage regulation is achieved by varying the ratio of on time-to-off time. In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.
[00042] Mixed signal received from transmitter 210 can also be received at buffering unit 226, which can be configured to buffer received mixed signal and send it to filter unit 228 to isolate pulse data. Isolated pulse data may or may not be amplified by an amplification unit 230 depending on one or more factors such as signal strength, length of transmission wire, and requirement of signal to noise ratio improvement. Signal from the filter unit 228 can also be inverted if needed so as to improve signal to noise ratio (SNR) and other parameters of the DC signal such as polarity compatibility with the subsequent electronics. Filtered pulse data signal after amplification and/or inversion will have the same number of pulses as transmitted from the pulse generation unit 216 based on input voltage potential V1, V2....Vn.
[00043] According to one embodiment, pulse data signal retrieved after processing at receiver220 can be processed by many alternate techniques to deliver DC output voltage, which can be proportional to number of speed control pulses received. Pulse data signal can be converted to pulse width modulation signal (PWM) by a PWM conversion unit 232.In general, Pulse-width modulation (PWM) or pulse-duration modulation (PDM) is a modulation technique that conforms to width of a pulse, formally pulse duration, based on modulator signal information. Although this modulation technique can be used to encode information for transmission, its main use is to allow control of power supplied to electrical devices, especially to inertial loads such as motors. The main advantage of PWM relates to significant reduction in power loss in the switching devices. When a switch is off, there is practically no current, and when it is on, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero.
[00044] Output PWM signals can proportionally represent pulses received from pulse generation unit 216 and pulse count can therefore be converted to PWM signal based on motor drive electronics that PWM conversion unit 232 is operatively coupled with through motor drive 236a so as to enable motor drive 236a and motor 238a coupled thereto to be run at desired speed. For instance, in an implementation, input voltage potential V1 can be processed by generation unit 216 at the transmitter end to result in one pulse, which can be transmitted to receiver 220 to generate a desired percent duty cycle that is required for specific speed requirement, say low speed for the motor. Similarly, two pulses can be generated for V2 voltage potential, which can accordingly be processed at unit 232 to generate a proportional PWM signal having increased pulse duty cycle and thus lower medium speed of the motor. Likewise, Vn can be used to generate 'n' pulses and corresponding highest duty cycle for highest speed desired from the motor. It would be appreciated that instead of PWM modulation signal, any other modulation technique such as any other voltage level modulation mechanism can also be incorporated to modulate a controllable DC load circuit.
[00045] In an embodiment, in certain motor controllers, there is a requirement of linear increase in DC input voltage on speed control pin of the controller for proportional increase in speed, which can be achieved by, say conversion of PWM signal to a final ready to use DC signal by means of a PWM to DC conversion unit 234,output from which can be fed to corresponding motor drive 236b, for speed control power supply and finally to motor 238a. Any other known method for linearly increasing DC input voltage on speed control pin of the controller for proportionally increasing speed can be incorporated, any such technique/mechanism is within the scope of the present disclosure.
[00046] Figure 3 illustrates an alternate receiver design 300 in accordance with an embodiment of the present disclosure. As can be seen, transmitter 302 can be configured to send a mixed signal of high voltage AC power supply along with pulse based speed control signal generated by a pulse generation unit to a receiver circuit. In implementation, the mixed signal can be received and converted into DC voltage of desired value by unit 304, wherein the output DC voltage can be based on motor operating DC voltage. Converted DC voltage may then be fed directly as motor supply. the converted voltage can be tapped and processed by a low voltage DC unit 306 for converting DC voltage into low voltage DC to meet the requirement of electronics of various units of receiver 300. Mixed signal received from transmitter 302 can also be received at buffering unit 308 and thereafter sent to a filter unit 310 for isolating pulse data, and then, if desired, to an amplification unit 312. Amplified signal from the amplification unit can be sent to a pulse count unit 314 configured to count the number of pulses received from pulse generation unit, based on which voltage potential V can be generated for onward transmission to motor drive for controlling speed of motor. Pulse count received from the unit 314 can be used to create an address for an analogue multiplexer 316 that is configured to multiplex speed inputs with pulse counts to determine final output desired DC voltage from block MUX 316. The final output desired DC voltage can be used as input to the motor drive unit 318 and motor 320.
[00047] In an embodiment, pulse count received from pulse count unit 314 can be used and processed to create an address for the analogue MUX 316, which can further be configured to generate desired DC voltage potential for motor drive 318 based on selected speed such as “speed 1”, “speed 2” ….. “speed n” for motor 320, wherein the selected speed is dictated and deduced from pulses received from the transmitter 302. One would appreciate that an analog multiplexer 316 is a switching device that can route DC pulse signals of any level within specified range based on sent speed control pulses using a transmission gate. Multiplexing address commands from pulse count unit 314 can command for at least a subset of the switches into a series of multi-bit command frames (speed 1, speed 2,….. speed n) and can transmit the command frames on a serial communication channel.
[00048] Figure 4(a) illustrates an exemplary transmitter side method 400 for controlling speed of a motor in accordance with embodiments of the present disclosure. At step 402, transmitter converts input AC input power supply to DC low voltage power supply to operate electronics in the transmitter section. At step 404, DC low voltage power supply can be processed to provide 'n' steps of DC voltage based on desired speed control. Such desired speed control of motor drive can be determined as a function of motor speed required for operating the motor and machine coupled thereto. Each step of the ‘n’ steps can incorporate a suitable delta in voltage values and can be implemented by means of a simple low power potential divider or other known means. In implementation, desired motor speed can be configured to correspond to unique DC voltage potential, such as voltage V1 for lowest speed, V2 for next to lowest, and Vn for the highest speed desired. Once the required DC voltage potential is determined based on desired motor speed, appropriate number of steps can be generated. Any number of speeds can be incorporated and supported by the discrete selector switch.
[00049] At step 406, a plurality of pulses that are representative of applied input voltage, V1, V2....Vn can be generated based on ‘n’ steps of DC voltage potential. In an exemplary embodiment, one pulse can be generated for voltage potential V1, two pulses can be generated for voltage potential V2, and “n” pulses can be generated for voltage potential Vn. It should be appreciated that the above mode of generation of pulses is completely exemplary and any other scheme of pulses or number of pulses can be generated for a given voltage potential.
[00050] At step 408, a mixed signal is generated based on the plurality of pulses and high voltage AC power supply. The step 408 includes mixing the pulse based speed control signal from step 406 with input AC power supply and implementation of an OR logical function between the AC power supply and the pulses. In an embodiment, both pulse based speed control signal and AC power supply are transmitted together, whereas, in another alternate embodiment, in an absence of pulse based speed control signal, normal high voltage AC input passes through. In a further embodiment, when a pulse or a stream of pulses is entered, transmission of high voltage input AC power supply to the receiver can be blocked. At step 410, mixed signal of pulses and AC power supply can be transmitted to the receiver.
[00051] Figure 4(b) illustrates an exemplary receiver side method 450 for controlling speed of a motor in accordance with embodiments of the present disclosure. At step 452, receiver receives mixed signal comprising high voltage AC supply and pulse based speed control signal. At step 454, the mixed signal can be processed and converted into a suitable DC voltage for motor operating voltage. At step 456, converted DC voltage may be converted into low DC voltage for operating transmitter electronics. At step 458, the mixed voltage signal can be processed to isolate pulse data by first sending to a buffer, wherein the buffered signal can then be sent from the buffer to a filter such as an active filter or a RC network filter. Step 458 can further include amplifying the speed control signal and/or inverting the signal to obtain a modified filtered signal having improved performance and SNR. At step 460, filtered speed control signal can, based on count of pulses received through mixed signal, be converted into a PWM signal, which can proportionally or figuratively represent received pulses and pulse count. At step 462, the motor can either be run using PWM signal based motor drives, or at 464, the PWM signal can be converted into appropriate DC voltage signal and at 466, the motor can be run using motor drive based on PWM signal based DC voltage signal. It should be understood that various steps described above are not necessarily executed in sequential manner.
[00052] According to one embodiment, transmitter can be coupled to receiver and many other secondary devices not shown in Figures 1-3.According to another embodiment, there is provided a controller for use in a power converter having a set of power switches. The controller may be configured to generate a set of switch commands such as speed control, pulse generation, wherein each switch command can be configured to indicate desired state of a power switch of the power converter at a moment in time. The pulse count unit 314can send desired pulses that act as ‘Address’ input for the Multiplexer 316, and select desired preset DC voltage to be sent to output of the Multiplexer 316. This DC output, when applied to the driver circuit 318, which demands DC voltage input for speed selection, can result in desired speed of the motor.
[00053] While the embodiments of the present disclosure have been described with reference to DC electric motor, single wire transmission interface of the present disclosure described above may be used in various types of systems other than converters used for motor drive to control their operating parameters, as it may be used in any application with a power switching transistor. For example, circuit may be used in direct current-to-direct current (DC/DC) converters such as boost converters, and it may be used to drive a single switch chopper that controls a heating element. The proposed single wire architecture can also be used in controllable DC load circuits such as a controllable DC heater, a controllable DC motor or a controllable DC lamp etc for respectively controlling the temperature, speed or brightness etc.
[00054] Single wire transmission interface may also have an error control system and an error correction code. Such a code may be able to automatically correct transmission error and improve transmission system performance as it avoids the time lost to transmit a corrupted frame again.
[00055] According to another embodiment, speed control based communication between transmitter and receiver can be implemented through one or a combination of opto-coupling, magneto-coupling or electro-coupling and so on. For better understanding, communication of opto-coupling can be assumed. It is emphatically noted that the components, transmitter, receiver and control/modulation signal converter of an AC/DC modulation conversion system of the present invention can be constructed by discrete components, an integrated circuit, or a system on chip (SOC).
[00056] While at least one exemplary embodiment has been presented in the foregoing detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. Rather, the foregoing detailed description will provide those skilled in the art with a convenient road map for implementing the exemplary embodiment or exemplary embodiments. It should be understood that various changes can be made in the function and arrangement of elements without departing from the scope of the invention as set forth in the appended claims and the legal equivalents thereof.
[00057] As used herein, and unless the context dictates otherwise, the term "coupled to" is intended to include both direct coupling (in which two elements that are coupled to each other contact each other) and indirect coupling (in which at least one additional element is located between the two elements). Therefore, the terms "coupled to" and "coupled with" are used synonymously. Within the context of this document terms "coupled to" and "coupled with" are also used euphemistically to mean “communicatively coupled with” over a network, where two or more devices are able to exchange data with each other over the network, possibly via one or more intermediary device.
[00058] In some embodiments, the numbers expressing quantities of ingredients, properties such as concentration, reaction conditions, and so forth, used to describe and claim certain embodiments of the invention are to be understood as being modified in some instances by the term “about.” Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that can vary depending upon the desired properties sought by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. The numerical values presented in some embodiments of the invention may contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
[00059] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[00060] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value with a range is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[00061] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all Markush groups used in the appended claims.
[00062] It should be apparent to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refers to at least one of something selected from the group consisting of A, B, C …. and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.
[00063] While embodiments of the present invention have been illustrated and described, it will be clear that the invention is not limited to these embodiments only. Numerous modifications, changes, variations, substitutions, and equivalents will be apparent to those skilled in the art, without departing from the spirit and scope of the invention, as described in the claim.

ADVANTAGES OF THE INVENTION
[00064] The present disclosure provides a simplified and reduced cost based architecture for installing devices by providing an apparatus for transmission of power and single wire transmission of signals to and from remotely located devices.
[00065] The present disclosure provides a method for transmission of high power.
[00066] The present disclosure provides a method for transmitting high power of several watts for running a high power device using AC input power while carrying digital speed control signal over same power transmission line.
[00067] The present disclosure provides a method for transmitting power to remote end by single wire with return wire being ‘neutral’ of AC power supply.
[00068] The present disclosure provides method for carrying AC power high voltage input to power up device at receiver end using same transmission wire.
,CLAIMS:1. A method for transmission of AC power and single wire transmission of control signal for a DC electric load, said method comprising the steps of:
a) generating, at a transmission end, one or more pulse signals based on corresponding one or more operating parameter values of said DC electric load, wherein each said pulse signal comprises one or more pulses depending on operating parameter value that corresponds to said pulse signal;
b) transmitting, at the transmission end, one of said one or more pulse signals in conjunction with said AC power signal to said DC electric load, wherein said one of said one or more pulse signals is selected based on current operating parameter value of said DC electric load;
c) receiving, at a receiving end, said one of said one or more pulse signals and said AC power signal as a mixed signal, wherein said mixed signal is separated at said receiving end to generate said one of said one or more pulse signals and said AC power signal;
d) processing, at the receiving end, said one of said one or more pulse signals to convert to a Pulsed Width Modulated(PWM) signal corresponding to said operating parameter value; and
e) driving, at the receiving end, said DC electric based load on said PWM signal.
2. The method of claim 1, wherein each of said one or more pulse signals is generated at said transmission end based on a corresponding DC voltage, wherein ‘n’ steps of DC voltage are generated corresponding to ‘n’ operating parameter values of said DC electric load.
3. The method of claim 1, wherein, at the receiving end, said AC power signal is separated and converted to DC voltage based on operating voltage of said DC electric load.
4. The method of claim 1, wherein return path from said receiving end to said transmission end is a neutral wire running independent to said DC electric load.
5. The method of claim 1, wherein said DC electric load is a DC motor, and wherein said operating parameter is motor speed.
6. The method of claim 1, wherein said PWM signal has a desired duty cycle corresponding to said operating parameter value.
7. An apparatus for single wire transmission of AC power signal and control signal for a DC electric load, said system comprising:
a) a transmitter configured to generate one or more pulse signals based on corresponding one or more operating parameter values of said DC electric load, wherein each said pulse signal comprises one or more pulses depending on operating parameter value that corresponds to said pulse signal, and wherein said transmitter is further configured to transmit one of said one or more pulse signals in conjunction with said AC power signal to said DC electric load, wherein said one of said one or more pulse signals is selected based on desired operating parameter value of said DC electric load; and
b) a receiver configured to receive said one of said one or more pulse signals and said AC power signal as a mixed signal, wherein said mixed signal is separated at said receiving end to generate said one of said one or more pulse signals and said AC power signal, and wherein said receiver is further configured to process said one of said one or more pulse signals to convert to a Pulsed Width Modulated (PWM) signal having duty cycle corresponding to said operating parameter value so as to drive said DC electric based on said PWM signal.
8. The apparatus of claim 7, wherein each of said one or more pulse signals is generated at said transmitter based on a corresponding DC voltage, wherein ‘n’ steps of DC voltage are generated corresponding to ‘n’ operating parameter values of said DC electric load.
9. The apparatus of claim 7, wherein, at the receiver, said separated said AC power signal is converted to DC voltage based on operating voltage of said DC electric load.
10. The apparatus of claim 7, wherein return path from said receiving end to said transmission end is a neutral wire running independent to said DC electric load.
11. The apparatus of claim 7, wherein said DC electric load is a DC motor, and wherein said operating parameter is motor speed.