[1]This application claims the benefit of priority based on the date of Korea Patent Application No. 10-2016-0090251 15 years 07 January 2016, and all information disclosed in the literature of the Korea patent application are included as part of the specification.
[2]The present invention relates to a battery between the circuit protection system and protection method using the pre-healing path, from than in detail, the vehicle lead-acid batteries and lithium polymer batteries according to the interconnecting circuit MOSFET (MOSFET) power off through the switch lead acid battery between the counter-electromotive force generated and prevents the MOSFET switch from being applied to the MOSFET switch from over-current, and a battery that can block conduction in charging lead acid other path is the leakage current from the battery than the predetermined path of the lead acid battery in advance circuit It relates to the protection system and protection.
BACKGROUND
[3]
In general, the lithium-polymer battery in a lithium polymer battery is associated with the vehicle lead-acid batteries to support there is an output of the vehicle lead acid batteries, to be cut off the current that is generated from a lithium-polymer battery when the external short circuit power.
[4]
To this end, conventionally, a metal oxide field effect transistor, i.e., MOSFETs were using a switching device, called (MOSFET) performs this breaking operation, this time using a MOSFET when suddenly cut off the electric power between the vehicle lead-acid battery and a lithium polymer battery vehicle motor in the conventional current-flow direction is the counter electromotive force (counter eletromotive force) is generated in the opposite direction (reverse direction), thus generating the counter electromotive force has had a problem in that power is supplied to the circuit through a lead acid automotive battery.
[5]
In general, the vehicle motor is also proportional to the amount of change in magnetic flux passing through the motor inside the coil increases rapidly due to the rotational speed is very fast, the counter electromotive force is accordingly exhibit a very high amount of power.
[6]
That is, the counter-electromotive force on the energizing circuit is because the excess current has a very high amount of power, if such a counter-electromotive force on the conductive circuit, there is a possibility of the various elements mounted on the circuit to be broken by an overcurrent.
[7]
In order to prevent this, in the prior art, were used to implement a reflux path (free wheeling path) that may be refluxed to the counter-electromotive force using the large number of MOSFETs, it is the characteristics of the MOSFET on one MOSFET is unified with the direction of the parasitic diode one since the direction control only in a direction that was not forced to limit in order to control the current direction applied to a number of MOSFETs, which was caused by various electrical problems according to the complexity and increase the circuit density of the circuit within the device.
[8]
Thus, the present inventors to solve the problems with the reflux path circuit of the above-mentioned prior art, a plurality of MOSFETs various controllable silicon controlled rectifiers in a direction a, the direction of the current, rather than implementing the reflux path through (also known as thyristors, SCR ) by using, the MOSFET (MOSFET) to prevent the counter electromotive force generated from the power-off lead-acid battery through the switch is applied to the MOSFET switch prevents the MOSFET switch from over-current, and also the leakage current from the lead acid battery during charging of the lead acid battery being conductive to a different path instead of the fixed path between the circuit can block the pre battery leading to the invention the protection system and a protection method.
Detailed Description of the Invention
SUMMARY
[9]
The present invention using the such, the invention is not to implement a reflux path through a plurality of MOSFETs, can the direction of the current in different directions control the silicon controlled rectifier (also known as thyristors, SCR) derived to solve the aforementioned problems by, the MOSFET (MOSFET) to prevent the counter electromotive force generated from the power-off lead-acid battery through the switch is applied to the MOSFET switch prevents the MOSFET switch from over-current, and also the path is the leakage current from the lead acid battery during charging of the lead acid battery defined is not intended to provide a circuit between the battery protection system and a protection method that can be blocked in advance that the conductive path to another.
Problem solving means
[10]
Among the embodiments of the present invention, the circuit between the battery protection system of claim 1 and a circuit formed by a second battery, a switching unit and the second to control the conductive state (Continuity) between the first and second battery by blocking the leakage current of a battery, or a reflux to the counter electromotive force of the first battery in the first battery direction (free wheeling), it may include a reflux for protecting parts of the switching from the counter electromotive force.
[11]
In one embodiment, the reflux unit silicon controlled rectifier (SCR), and detects a voltage value of the first battery and outputs an operation signal for changing the operating state of the silicon controlled rectifier to the ON state in accordance with the detected voltage value which may include a voltage detector.
[12]
In one embodiment, the voltage detector when it is determined to be the reverse direction rather than the first, and determining the direction the battery is connected, the connection direction of the first battery positive direction through the detected voltage value and outputting the operation signal that can not be characterized.
[13]
In one embodiment, when the first battery through the external charging source charge leakage current leaks to the reflux negative direction from the first battery can be cut off by the silicon controlled rectifier.
[14]
In one embodiment, the case is, the switching part opening (OPEN) of operating in the state in which the silicon controlled rectifier-one in a conduction state between the first and second battery change in a short-circuited state, output from the first battery through the back electromotive force of the silicon controlled rectifier so as to reflux the battery in a first direction, the voltage detector may output a signal to reflux for changing from one state to the operation state of the silicon controlled rectifier as reflux.
[15]
In one embodiment, as the counter electromotive force output from the first battery wherein the battery 1 flows back direction through said silicon controlled rectifier, the switching unit can be protected from the counter electromotive force.
[16]
In one embodiment, the switching unit may be a metal oxide field effect transistor (MOSFET).
[17]
Battery between the circuit protection method according to another embodiment of the present invention the first and the step of controlling the conductive state (Continuity) between the first and second batteries through the, switching a circuit to be formed, including two batteries and a reflux thereby, the isolation leakage current of the first battery or to reflux the counter electromotive force of the first battery in the first battery direction (free wheeling) through an may include a step for protecting parts of the switching from the counter electromotive force.
[18]
In one embodiment, the operating signal for changing steps to protect parts of the switch is the operating state of the silicon controlled rectifier according to the step and the detected voltage value for detecting a voltage value of the first battery via a voltage detector in an on state a may comprise the output of a silicon controlled rectifier.
[19]
In one embodiment, the operating signal when the step of protecting parts of the switching is determined to be the reverse direction rather than the first, and determining the direction the battery is connected, the connection direction of the first battery positive direction through the detected voltage value does not output to the stage may further include.
[20]
In one embodiment, the method comprising steps of protecting parts of the switching blocks the leakage current that leaks to the reflux negative direction from the first battery through the first hour of the first battery charge, the silicon controlled rectifier through an external charging source there can be further included.
[21]
If in one embodiment, the method for protecting parts of the switching is, the switching part opening (OPEN) of operating in the state in which the silicon controlled rectifier-one in a conduction state between the first and second battery change in short-circuit conditions, the via of claim wherein the silicon controlled rectifier to the counter electromotive force output from the first battery so as to reflux the a first battery direction, reflux for changing from through the voltage detector on the operating state of the silicon controlled rectifier to the reflux a step of outputting a signal may be further included.
[22]
In one embodiment, the step of protecting parts of the switching is the first as the counter electromotive force output from the first battery of the first battery direction refluxed through the silicon controlled rectifier, add the switching further comprises the step is protected from the counter electromotive force can.
[23]
In one embodiment, the step of controlling a conduction state between the first and the second battery may include the step of implementing said switching portion based on a metal oxide field effect transistor (MOSFET).
Effects of the Invention
[24]
According to an aspect of the invention, by implementing a reflux path (pre-healing path) by using a silicon controlled rectifier (SCR), it has the advantage of being able to control both the current orientation of the direction of the counter electromotive force current and leakage current.
[25]
According to an aspect of the invention, through a voltage value detector only if the vehicle lead-acid batteries connected normally an operating state of the silicon controlled rectifier, because it changes from the ON state to the OFF state, if the battery connection direction changes due to carelessness of a worker even has the advantage that can prevent malfunction by controlling the operating state of the silicon controlled rectifier.
[26]
According to an aspect of the invention, by excluding the plurality of MOSFETs applied and eliminating the complexity of the connection circuit between the batteries, whereby according to and element density can be remarkably reduced, and the cost of the large number of MOSFETs application problem can be solved It has the advantage.
[27]
According to an aspect of the invention, using a silicon that when lead-acid rechargeable batteries through an external charging source leakage current that may leak from the lead acid battery is to be conductive to a different path instead of the fixed path controlled rectifier (SCR) block in advance It can have the advantage.
Brief Description of the Drawings
[28]
1 is a view schematically showing the configuration of the battery between the circuit protection system 100 according to one embodiment of the present invention.
[29]
2 is a diagram illustrating the configuration and the operation state of the silicon controlled rectifier (120a) shown in Figure 1 in more detail.
[30]
Figure 3 is a diagram illustrating an operation procedure of a battery between the circuit protection system 100 according to one embodiment of the present invention.
Mode for the Invention
[31]
Or less, it presents a preferred embodiment for better understanding of the present invention. However, the following examples are not limited to the context of the present invention by the intended addition, the examples provided in order to more readily understand the invention.
[32]
[33]
1 is a view schematically showing the configuration of the battery between the circuit protection system 100 according to one embodiment of the present invention.
[34]
1, the circuit between the battery protection system 100 according to one embodiment of the present invention may be configured to include a switching unit 110, and a reflux unit 120.
[35]
First, the switching unit 110 serves to control a conduction state (Continuity) between the first and second batteries (1, 2) first and second batteries (1, 2) on the circuit 3 is formed, including the can be performed.
[36]
Here, the first battery (1) means any and cathode sulfuric acid as the electrolyte (-) may be the sense lead, an anode (+) is a vehicle lead-acid batteries can be charged and discharged the lead dioxide is applied as possible, the second battery ( 2) it may be generally referred to means that can be charged and discharged lithium battery such as a lithium polymer battery.
[37]
In addition, the first battery (2) may serve to assist the output of the first battery (1), the first and on the available battery 2 can be applied to the vehicle battery (1, 2) or the charge and discharge that a kind, capacity, and yield the corresponding should note sHALL be limited.
[38]
On the other hand, the switching unit 110 may perform switching functions to the first and second batteries (1, 2) are electrically connected to the connection state being a conductive state in (close) or open (open) to each other, one example example may include a metal oxide field effect transistor (MOSFET, MOSFET).
[39]
If the conductive state of this switching unit 110 is changed from the connected state to the open state, the electrical connection between the first and second batteries (1, 2) to be short-circuited.
[40]
On the other hand, when the conductive state of the switching unit 110 is changed from the connected state to the open state, the first counter-electromotive force generated from the battery (1) and connected to an external motor (not shown) (counter eletromotive force) the first battery (1 ) it may be applied to the circuit 3 via.
[41]
An external motor (not shown) is also proportional to the amount of change in magnetic flux passing through the motor inside the coil increases rapidly due to the rotational speed is very high, the counter electromotive force also exhibit a very high amount of power accordingly.
[42]
That is, the counter electromotive force which is energized on the circuit (3) is so because it corresponds to the over-current with a high power, the MOSFET by this counter-electromotive force in this case that the conduction on the circuit (3), with the various elements mounted on a circuit, in particular above ( since the switching unit 110, such as a MOSFET) it is damaged by the back-EMF, the various elements on the circuits 3 through the reflux section 120 which will be described later According to the invention, in particular to protect the switching unit (110) have.
[43]
On the other hand, to perform the role of the switching unit 110 in the present specification and are electrically connected to the first and second batteries (1, 2) to change the conductive state between the first and second batteries (1, 2) one, note the type of the switching unit 110 sHALL be limited.
[44]
[45]
In one embodiment, the battery between the circuit protection according to the invention system 100 is to control the state of, by applying a switching signal to the switching unit 110, the above-described switching unit 110 to the ON state or the OFF state controller (110a ) may further include a.
[46]
On the other hand, the above-mentioned controller (110a) generally may refer to a vehicle MCU (Micro Controller Unit) that controls the on or off operation of the MOSFET provided in the electric vehicle battery, which is detailed because the use of conventional techniques known Description will be omitted.
[47]
[48]
And then from, the reflux section 120 is connected in parallel between the aforementioned first and second batteries (1, 2) and the first battery (1) to block the leakage current, or the first battery (1) of by refluxing the above counter electromotive force is output to the first battery (1) direction than the second battery (2) (free wheeling) may perform the role of protecting the switching unit (110).
[49]
Here, also the leakage current la of the first battery (1), the first battery 1 is charging through an external charging source (not shown), the first switching unit 110 from the battery 1 or claim 2 not a path toward the battery 2, it may represent the current which leaks to the path toward a reflux portion 120. the
[50]
At this time, in order to prevent such leakage current from leaking to the reflux section 120, a reflux unit 120 may include a silicon controlled rectifier (SCR, 120a).
[51]
A silicon controlled rectifier (120a) may be referred to as the 'thyristor ", it may refer to a device which serves to control the current direction of the high-current or high voltage is not a typical transistor can be energized.
[52]
Here, the silicon controlled rectifier (120a) has internally a device that are collectively referred to as a four-layer structure semiconductor device of the PNPN junction, the transistor for performing the NPN transistor and serves to perform a PNP role may have a structure combined with each other.
[53]
At this time, the transistors that perform the transistor and the NPN role played by the PNP role included in the silicon controlled rectifiers (120a) is because it has a different diode (diode) having a unidirectional current direction internally respectively, the first battery (1 ) is the leakage current when the current direction of the leak current that leaks to the current direction and a direction opposite to the above, each of the diodes can be blocked from the input to the silicon controlled rectifier (120a).
[54]
Accordingly, the leakage current block by a silicon controlled rectifier (120a) comprises a can be supplied to the second battery (2), which by the As a result, the first battery (1) leakage current of a silicon controlled rectifier (120a) leaking from It may mean that it is prevented from being unnecessarily consumed.
[55]
Further, where the means sikindaneun reflux the counter electromotive force output from the first battery (1) in a first battery (1) direction is changed from the connected operating state (close) state of the switching unit 110 to the open (open) state a first battery (1), a counter electromotive force of the second battery (2), silicon controlled rectifiers (120a) from being applied in a direction in accordance with the output from that can be interpreted to mean that such conductive intercepting in between.
[56]
On the other hand, the reflux in this specification is meant refer to a pre-healing (free wheeling), a reflux unit 120 may serve to provide a reflux path (free wheeling path) in the counter-electromotive force can be conductive.
[57]
If, if not the counter electromotive force is not reflux through reflux unit 120, the counter electromotive force via the second battery (2) may be applied to the switching unit (110), wherein the switching unit 110 is opened (open) state because it corresponds to the case is applied to the switching unit 110, the counter electromotive force is opened there is a possibility the switching section 110 is destroyed by the counter electromotive force corresponding to the over-current.
[58]
Thus, the reflux section 120 to advance the counter electromotive force reflux to prevent this, it is possible to serve such that re-enter into the first battery (1).
[59]
[60]
On the other hand, a reflux unit 120 according to an embodiment of the present invention detects a voltage value of the above-described first battery (1) in real time, in accordance with the detected voltage value of the off an operating state of the silicon controlled rectifier (120a) a voltage detector (voltage detector, 120b) for outputting an operation signal for changing to the on state to state may be further included.
[61]
Voltage detector (120b) is the case where two directions of the first battery (1) measuring the voltage value of the current, or the first battery (1) to be conductive to from the battery (2) connected in the forward direction the first battery ( 1) a first battery (1) to serve for determining the direction connected by measuring the voltage value of the electric current.
[62]
For example, when the first battery (1) is connected in the reverse direction rather than the forward direction voltage detector (120b) is currently the first battery (1) since it is not a detected voltage value from the first battery (1) is forward is determined to be reverse coupled to a non-operation state of the silicon controlled rectifier as a result (120a) due to such a case not outputting an operation signal to the silicon controlled rectifier (120a) direction is in the oFF state can be maintained.
[63]
Thus, the battery 1 is not 1 is the case which is connected in the reverse direction is not an inadvertent operation error by maintaining a state in which the silicon controlled rectifiers (120a) off occurs.
[64]
[65]
In one embodiment, the first battery (1) that the case is connected in a forward direction, a voltage value detector (120b) is currently the first battery (1) Since the voltage value is detected from the first battery (1) is connected in the forward direction and to determine, in this case is output an operation signal to the silicon controlled rectifier (120a) direction is presented as a result to change in the operation state of the PNP transistor off state of the silicon controlled rectifier (120a) in the on state.
[66]
On the other hand, of operating as an internal silicon controlled rectifiers (120a) PNP transistor the ON state, the switching unit 110 is opened (open) in a conductive state between the first and second batteries (1, 2) changes in short-circuit state the voltage value of the threshold voltage value detected by the voltage detector (120b) according to if it exceeds (e.g., more than 0.6v), the internal voltage level detector (120b) is a silicon controlled rectifier (120a) NPN transistor in the operating state is output to reflux signal to change to the oN state from the oFF state is consequently changed in the operating state of the NPN transistor of the silicon controlled rectifier (120a), the oFF state to the oN state of the final reflux 120 the reflux path (free wheeling path) is to be formed.
[67]
Accordingly, the counter electromotive force output from the first battery (1) according to opening of the switching section 110 is inputted to the back first battery 1 in accordance with a reflux path of the aforementioned reflux 120, whereby the switching unit in accordance with 110 can be prevented from the damage the counter electromotive force.
[68]
[69]
Next, to take a look at the process of a schematic configuration, process, and the counter electromotive force of leakage current is interrupted for a silicon controlled rectifier (120a) described above with reference to FIG 2, reflux.
[70]
2 is a diagram illustrating the configuration and the operation state of the silicon controlled rectifier (120a) shown in Figure 1 in more detail.
[71]
First, the voltage value detector, because even not look at the 2 (a), 2 (a) is as shown a case in which the first battery (1) is connected in the reverse direction rather than the forward direction, the current flow of the reverse connection is detected ( 120b) is not outputting an operation signal for operating a silicon controlled rectifier (120a).
[72]
Figure 2 (b) a look, and Fig. 2 (b) is first as illustrating a case where the battery 1 is connected in a forward direction, a voltage value detector (120b), since the current flow according to the forward link detection silicon controlled rectifier and outputs an operation signal for operating the (120a), whereby is to be changed to the operational state of the PNP transistor in a silicon controlled rectifier (120a) on state. In this case, NPN transistor is a current connection (close) state.
[73]
Figure 2 Referring to 2 (c), Figure (c) is the conduction of the first battery (1) is that the opening (open) switch section 110, when connected in the forward direction first and second batteries (1, 2) as a state that shows a case where a short-circuited state, the switching unit 110, the counter electromotive force according to the opening (more than 0.6v) because the detected voltage value detector (120b) is refluxed for driving the NPN transistors of the silicon controlled rectifier (120a) and it outputs the signal, and thus is to be changed to the operating state of the NPN transistor in the silicon controlled rectifiers (120a) on state. At this time, since the PNP transistor and the NPN transistor connected to both (close) state, counter electromotive force is also 2 (c) are energized in accordance with the path of the 'K' direction from the city 'A' to be refluxed to the first battery (1) can.
[74]
[75]
Next, to take a look at the operation procedure of the battery between the circuit protection system 100 according to the present invention over the FIG.
[76]
Figure 3 is a diagram illustrating an operation procedure of a battery between the circuit protection system 100 according to one embodiment of the present invention.
[77]
Referring to Figure 3, first, detects a voltage value of a first case where the battery 1 is connected to voltage detector (120b) to the first battery (1) through (S301).
[78]
At this time, the voltage detector (120b), which can be determined by the direction that the current first battery 1 is connected, if connected in the reverse state in the normal direction based on the voltage value detected, if the first battery (1) is in the forward direction when connected, and to the PNP transistor of the inner silicon controlled rectifiers (120a) operates by outputting an operation signal to the silicon controlled rectifier (120a) (S302a), if the first case where the battery 1 is connected in the reverse direction, the outputs operation signals no claim 1, thereby the battery 1 maintains the operating state of the silicon controlled rectifier (120a) until it is connected in the forward direction in the off state (S302b).
[79]
After step S302a, the first and second batteries (1, 2) circuit 3, a current is conduction formed on the circuit operation that includes, depending on changes to the conductive state is connected (close) state of the switching unit 110 It may be performed (S303).
[80]
Then, thereby vehicle operation is terminated, or is opened when the external power short circuit, the switching unit 110 and causes a short circuit (S304), voltage detector (120b) is the voltage change in the switching unit 110, opening It is detected (S305).
[81]
Then, the voltage detector (120b) is such that the NPN transistor in the silicon controlled rectifiers (120a) operates by outputting a signal to the reflux silicon controlled rectifiers (120a) (S306).
[82]
Thus, the first counter electromotive force outputted from the battery 1 can be the reflux to the first battery (1) direction via the reflux path (free wheeling path) formed through the S306 step and (S307), the second battery accordingly ( 2) the switching unit (110 is connected) may be protected from the counter electromotive force.
[83]
[84]
Wherein in a preferred embodiment it has been with reference to describe, to vary the invention within the scope not departing from the spirit and scope of the invention as set forth in the claims below are those skilled in the art modifications and variations of the present invention it will be appreciated that it can be.

Claims

[Claim 1]A first and a switching part for controlling the first and second conductive states between the battery (Continuity) in a circuit to be formed including the second battery; And by the first reflux a counter-electromotive force of the cut-off leak current, or the first battery of the battery in the first battery direction (free wheeling), a reflux unit for protecting parts of the switching from the counter electromotive force; comprises a, circuit between the battery protection system.
[Claim 2]
The method of claim 1, wherein the reflux comprises: a silicon controlled rectifier (SCR); And it detects a voltage value of the first battery, in accordance with the detected voltage value, a voltage value detector for outputting an operation signal for changing the operating state of the silicon controlled rectifier to the ON state; characterized by comprising a battery between circuit protection system.
[Claim 3]
The method of claim 2, wherein the voltage detector, for determining the direction of the first battery is connected through the detected voltage value, and the connection direction of the first battery is determined to be the reverse direction than the normal direction the operation signal , circuit protection system between the battery, characterized in that it does not output.
[Claim 4]
The method of claim 2, wherein, when the first battery through the external charging source charge, leakage current that leaks to the reflux negative direction from the first battery, a circuit between the battery characterized in that the blocked by the silicon-controlled rectifier protection system.
[Claim 5]
The method of claim 2, wherein if is, the switching part opening (OPEN) of operating in the state in which the silicon controlled rectifier-one in a conduction state between the first and second battery change in short-circuit state, the first output from the first battery to which a counter electromotive force through the silicon controlled rectifier so as to reflux the a first battery direction, and the voltage detector is characterized in that it outputs the reflux signal to change from the oN state to the operation state of the silicon controlled rectifier to the reflux , circuit protection system between batteries.
[Claim 6]
The method of claim 5, wherein the switching unit comprises a circuit protection system between the battery characterized in that the protection from the counter electromotive force as the counter electromotive force output from the first battery wherein the reflux to the first battery direction through the silicon controlled rectifier.
[Claim 7]
The method of claim 1, wherein the switching unit comprises: a metal oxide field effect transistor (MOSFET); the, circuit protection system, characterized in that between the battery.
[Claim 8]
The step of controlling the conductive state (Continuity) between the first and second batteries through the, switching a circuit to be formed including the first and second batteries; And refluxed by the first reflux for blocking the leakage current, or counter-electromotive force of the first battery of the battery in the first battery direction (free wheeling) through the, steps to protect parts of the switching from the counter electromotive force; characterized in that it comprises a circuit protection method liver, according to the battery.
[Claim 9]
10. The method of claim 8, further comprising: detecting a voltage value of the first battery comprising: protecting the switching unit is, via the voltage detector; A circuit protection method between the battery comprises a; and in accordance with the detected voltage value and outputting an operation signal for changing an operating state of the silicon controlled rectifier to the ON state to the silicon controlled rectifier.
[Claim 10]
10. The method of claim 9, wherein the protection unit of the switching, when determining the direction of the first battery is connected through the detected voltage value, and the connection direction of the first battery is determined to be the reverse direction, not forward the circuit protection method liver which is characterized in that it further comprise a battery; step does not output an operation signal.
[Claim 11]
10. The method of claim 9, wherein the protection unit of the switching is, when the first battery through the external charging source charged and to block the leakage current that leaks to the reflux negative direction from the first battery through the silicon controlled rectifier step; the, circuit protection method between battery according to claim 1, further comprising.
[Claim 12]
10. The method of claim 9, wherein the protection unit of the switching is, is the switching portion opening (OPEN) of operating in the state in which the silicon controlled rectifier-one in a conduction state between the first and second battery change in short-circuit state If, changing the counter electromotive force output from the first battery through the silicon controlled rectifier the first so as to reflux the first battery direction, the operating state of the silicon controlled rectifier through the voltage detector to reflux in an on state circuit between the protection method according to claim 1, further comprising, a battery; outputting a signal for reflux.
[Claim 13]
Of claim 12, further comprising a protector of the switching is, as the counter electromotive force output from the first battery wherein the reflux to the first battery direction through the silicon controlled rectifier, comprising: the switching portion is protected from the counter electromotive force; the a circuit protection method between battery according to claim 1, further comprising.
[Claim 14]
The method of claim 8, wherein the first and second step of controlling a conduction state between the battery, based on the metal oxide film field effect transistor (MOSFET) for implementing parts of the switch; liver comprising the, battery circuit how to protect.