Protection circuit of BMS power supply circuit

Abstract

The utility model provides a protection circuit of a BMS power supply circuit. The protection circuit comprises a power supply module, a control module, a driving module and a switch module. The current output end of the power module is connected with the power supply end of an external BMS power supply circuit through the switch module. The acquisition end of the control module is connected with the current output end of the power module, the control output end of the control module is connected with the control input end of the driving module, and the driving output end of the driving module is connected with the switch module. According to the protection circuit of the BMS power supply circuit, based on the protection circuit formed by the power supply module, the control module, the driving module and the switch module, when abnormal power consumption and short circuit occur in the BMS power supply circuit, the switch module is driven to be closed to disconnect power supply to the BMS power supply circuit, protection of the BMS power supply circuit is achieved, and the BMS power supply circuit is protected. And the problem of deep over-discharge after the battery consumes power is avoided, so that the service life of the battery is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a protection circuit for a BMS power supply circuit. Background Art

[0002] With the rapid development of the battery field, it is often necessary to manage the battery status during battery use in order to protect the battery.

[0003] Currently, batteries are mainly managed through a battery management system (BMS). The power supply for the BMS power supply circuit comes from the battery itself. Specifically, the BMS monitors the battery status to prevent over-charging and over-discharging of the battery and extend the battery life.

[0004] However, in the existing methods, when the BMS power supply circuit has abnormal power consumption and short circuit problems, it will cause problems such as deep over-discharge of the battery after power consumption, thereby reducing the service life of the battery. Utility Model Content

[0005] In view of this, the purpose of the present application is to provide a protection circuit for a BMS power supply circuit, which can be based on a protection circuit composed of a power module, a control module, a drive module and a switch module. When abnormal power consumption and short circuit occur in the BMS power supply circuit, the switch module is driven to close to disconnect the power supply to the BMS power supply circuit, thereby protecting the BMS power supply circuit and avoiding the problem of deep over-discharge of the battery after power consumption, which is beneficial to prolonging the battery life.

[0006] An embodiment of the present application provides a protection circuit for a BMS power supply circuit, the protection circuit comprising a power supply module, a control module, a drive module and a switch module;

[0007] The current output end of the power module is connected to the power supply end of the external BMS power supply circuit through the switch module; the acquisition end of the control module is connected to the current output end of the power module, the control output end of the control module is connected to the control input end of the drive module, and the drive output end of the drive module is connected to the switch module.

[0008] In some embodiments, the power module is used to supply power to the protection circuit and the external BMS power supply circuit respectively;

[0009] The control module is used to collect the current output by the power module and send a control signal to the driving module;

[0010] The driving module is used to receive the control signal to drive the switch module to close, thereby disconnecting the power supply from the power supply module to the external BMS power supply circuit.

[0011] In some embodiments, the power module includes a battery module and a low-power standby power module; the current output end of the battery module is connected to the switch module, and is connected to the power supply end of the external BMS power supply circuit through the switch module, and the current output end of the low-power standby power module is respectively connected to the control module, the drive module and the switch module;

[0012] In some embodiments, the battery module is used to supply power to the external BMS power supply circuit, so as to disconnect the power supply to the external BMS power supply circuit when the switch module is turned off;

[0013] The low-power standby power module is used to supply power to the protection circuit.

[0014] In some embodiments, the protection circuit further includes an isolation module; an input end of the isolation module is connected to a control output end of the control module, and an output end of the isolation module is connected to a control input end of the driving module;

[0015] The isolation module is used to isolate the control module from the drive module.

[0016] In some embodiments, the isolation module is an optocoupler module.

[0017] In some embodiments, the driving module includes a holding module and a signal flipping module; the control input end of the holding module is connected to the control output end of the control module, the signal output end of the holding module is connected to the input end of the signal flipping module, and the driving output end of the signal flipping module is connected to the switch module;

[0018] In some embodiments, the holding module is used to hold the state of the control signal output by the control module;

[0019] The signal flipping module is used to flip the signal output by the holding module.

[0020] In some embodiments, the control module further includes a voltage regulating circuit; the voltage regulating circuit is connected to the control module;

[0021] The voltage regulating circuit is used to regulate the voltage of the control module.

[0022] In some embodiments, the power module further includes a current-sensing resistor; the current-sensing resistor is connected to the collection end of the control module, and the current output end of the power module is connected to the switch module through the current-sensing resistor;

[0023] The current-sensing resistor is used to detect the current output by the power module and output the current to the control module.

[0024] In some embodiments, the protection circuit further includes an adjustment capacitor; two ends of the adjustment capacitor are respectively connected to the output end of the isolation module and the control input end of the driving module;

[0025] The regulating capacitor is used to adjust the time when the driving module drives the switch module to close.

[0026] In some embodiments, the protection circuit further includes an anti-reverse diode; one end of the anti-reverse diode is connected to the isolation module, and the other end is connected to the driving module;

[0027] The anti-reverse diode is used to prevent reverse current or reverse voltage.

[0028] The embodiment of the present application provides a protection circuit for a BMS power supply circuit, including a power module, a control module, a drive module and a switch module; the current output end of the power module is connected to the power supply end of an external BMS power supply circuit through the switch module; the acquisition end of the control module is connected to the current output end of the power module, the control output end of the control module is connected to the control input end of the drive module, and the drive output end of the drive module is connected to the switch module. The protection circuit of the BMS power supply circuit of the present application is based on a protection circuit composed of a power module, a control module, a drive module and a switch module. When the BMS power supply circuit has abnormal power consumption and a short circuit, the drive switch module is turned off to disconnect the power supply to the BMS power supply circuit, thereby protecting the BMS power supply circuit and avoiding the problem of deep over-discharge after the battery is exhausted, which is beneficial to prolonging the life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of the protection circuit of the BMS power supply circuit according to the embodiment of the present application is shown;

[0031] Figure 2 An example diagram of a protection circuit for a BMS power supply circuit according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0033] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0034] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0035] Considering the rapid development of the battery field, it is often necessary to manage the battery status during the use of the battery to protect the battery. At present, the battery is mainly managed by the battery management system (BMS). The power supply of the BMS power supply circuit comes from the battery itself. Specifically, the BMS monitors the battery status to prevent the battery from overcharging and discharging and extend the battery life. However, when the BMS power supply circuit has abnormal power consumption and short circuit problems, it will cause problems such as deep over-discharge after the battery is consumed, thereby reducing the battery life.

[0036] Based on this, the embodiment of the present application provides a protection circuit for a BMS power supply circuit, including a power module, a control module, a drive module and a switch module; the current output end of the power module is connected to the power supply end of an external BMS power supply circuit through the switch module; the acquisition end of the control module is connected to the current output end of the power module, the control output end of the control module is connected to the control input end of the drive module, and the drive output end of the drive module is connected to the switch module. The protection circuit of the BMS power supply circuit of the present application, based on the protection circuit composed of the power module, the control module, the drive module and the switch module, can realize that when the BMS power supply circuit has abnormal power consumption and short circuit, the drive switch module is turned off to disconnect the power supply to the BMS power supply circuit, thereby realizing the protection of the BMS power supply circuit and avoiding the problem of deep over-discharge after the battery is exhausted, which is beneficial to prolonging the life of the battery.

[0037] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of the protection circuit of the BMS power supply circuit according to the embodiment of the present application is shown; specifically, Figure 1 As shown, the protection circuit 100 of the BMS power supply circuit includes: a power module 1, a control module 2, a drive module 3 and a switch module 4.

[0038] The current output end of the power module 1 is connected to the power supply end of the external BMS power supply circuit through the switch module 4; the acquisition end of the control module 2 is connected to the current output end of the power module 1, the control output end of the control module 2 is connected to the control input end of the drive module 3, and the drive output end of the drive module 3 is connected to the switch module 4.

[0039] The power module 1 is used to supply power to the protection circuit and the external BMS power supply circuit respectively.

[0040] The control module 2 is used to collect the current output by the power module 1 and send a control signal to the drive module 3.

[0041] The driving module 3 is used to receive a control signal to drive the switch module 4 to close, thereby disconnecting the power supply from the power module 1 to the external BMS power supply circuit.

[0042] Specifically, Figure 2 As shown, Figure 2 The boxed portion where the number "①" is located represents the power module 1 of the present application, the boxed portion where the number "②" is located represents the control module 2 of the present application, the boxed portion where the number "③" is located represents the drive module 3 of the present application, and the boxed portion where the number "④" is located represents the switch module 4 of the present application. It should be noted that Figure 2 As shown, U1 in the frame ② is an operational amplifier comparator, which constitutes the control module 2 of the present application.

[0043] The protection circuit 100 of the BMS power supply circuit of the embodiment of the present application includes a power module 1, a control module 2, a drive module 3 and a switch module 4; the current output end of the power module 1 is connected to the power supply end of the external BMS power supply circuit through the switch module 4; the acquisition end of the control module 2 is connected to the current output end of the power module 1, the control output end of the control module 2 is connected to the control input end of the drive module 3, and the drive output end of the drive module 3 is connected to the switch module 4. The protection circuit of the BMS power supply circuit of the present application is based on the protection circuit composed of the power module, the control module, the drive module and the switch module. When the BMS power supply circuit has abnormal power consumption and short circuit, the switch module is driven to close to disconnect the power supply to the BMS power supply circuit, thereby protecting the BMS power supply circuit and avoiding the problem of deep over-discharge after the battery is consumed, which is beneficial to prolonging the life of the battery.

[0044] Furthermore, the power module 1 includes a battery module and a low-power standby power module.

[0045] Among them, the current output end of the battery module is connected to the switch module 4, and is connected to the power supply end of the external BMS power supply circuit through the switch module 4. The current output end of the low-power standby power module is respectively connected to the control module 2, the drive module 3 and the switch module 4.

[0046] To continue, the battery module is used to supply power to the external BMS power supply circuit, so as to disconnect the power supply to the external BMS power supply circuit when the switch module 4 is turned off.

[0047] The low-power standby power module is used to supply power to the protection circuit 100 .

[0048] Specifically, Figure 2 As shown, in box ①, "VBAT" is the positive power supply terminal, indicating the current output terminal of the battery module, that is, it is connected to an external battery module, "LDO" indicates a low-power standby power module, "3V3_STBY" is a low-power standby power supply signal, and "POWER_IN" is the input terminal of the external BMS power supply circuit.

[0049] Furthermore, the protection circuit 100 of the BMS power supply circuit of the embodiment of the present application also includes an isolation module.

[0050] The input end of the isolation module is connected to the control output end of the control module 2 , and the output end of the isolation module is connected to the control input end of the driving module 3 .

[0051] The isolation module is used to isolate the control module 2 and the drive module 3.

[0052] Optionally, the isolation module is an optocoupler module.

[0053] Specifically, Figure 2As shown, “U2” represents an optocoupler module, i.e., an isolation module.

[0054] Furthermore, the driving module 3 includes a holding module and a signal flipping module.

[0055] The control input end of the holding module is connected to the control output end of the control module 2 , the signal output end of the holding module is connected to the input end of the signal flip module, and the drive output end of the signal flip module is connected to the switch module 4 .

[0056] A holding module, used to hold the state of the control signal output by the control module 2;

[0057] The signal flip module is used to flip the signal output by the holding module.

[0058] Specifically, Figure 2 As shown, in box ③, the holding circuit composed of R4 / R10 / R11 / R13 / Q2 / Q4, etc. represents a holding module, which is used to maintain the state of the previous front-end circuit enable signal, that is, to maintain the state of the control signal output by the control module 2. For example, if the previous front-end circuit enable signal is at a high level, the holding module maintains the signal at a high level; if the previous front-end circuit enable signal is at a low level, the holding module maintains the signal at a low level; the signal flipping circuit composed of R12 / C2 / Q3 / R3 / R2 / C1 / Q1, etc. represents a signal flipping module.

[0059] Furthermore, the control module 2 also includes a voltage regulation circuit;

[0060] Wherein, the voltage regulation circuit is connected to the control module 2 .

[0061] The voltage regulating circuit is used to regulate the voltage of the control module 2. Optionally, the voltage regulating circuit may be a voltage dividing resistor.

[0062] It should be noted that the voltage regulating circuit can adjust the trigger value of the signal flip module 32, that is, the signal flip module 32 triggers the flipping of the signal through the voltage regulating circuit.

[0063] Specifically, Figure 2 As shown, on the left side of box ②, R7 / R9 are voltage-dividing resistors, representing a voltage regulation circuit, which can divide the voltage output by the OUT pin of U1.

[0064] Furthermore, the power module 1 also includes a current-sensing resistor.

[0065] The current-sensing resistor is connected to the collection end of the control module 2 , and the current output end of the power module 1 is connected to the switch module 4 via the current-sensing resistor.

[0066] The current-sense resistor is used to detect the current output by the power module 1 and output the current to the control module 2.

[0067] Specifically, Figure 2 As shown, in box ①, R1 represents the current sensing resistor of the present application.

[0068] Furthermore, the protection circuit 100 also includes an adjustment capacitor.

[0069] The two ends of the regulating capacitor are respectively connected to the output end of the isolation module and the control input end of the driving module 3 .

[0070] The regulating capacitor is used to adjust the time when the driving module 3 drives the switch module 4 to close.

[0071] Specifically, Figure 2 As shown, on the right side of box ②, C4 represents the regulating capacitor of the present application, which is used to adjust the time of closing Q3, wherein the charging process of C4 is equivalent to being in the on state, Q3 is pulled down, and the pulling down of Q3 means that Q3 is closed.

[0072] It can be understood that under normal conditions, Q3 is in the open state, and when abnormal power consumption and short circuit occur in the BMS power supply circuit, Q3 is pulled down.

[0073] Furthermore, the protection circuit 100 also includes an anti-reverse diode.

[0074] One end of the anti-reverse diode is connected to the isolation module, and the other end is connected to the driving module 3 .

[0075] Anti-reverse diode, used to prevent reverse current or reverse voltage.

[0076] Specifically, Figure 2 As shown, D2 represents the anti-reverse diode of the present application.

[0077] It should also be noted that the power module 1 may be connected in series with a fuse to protect the battery. Optionally, the fuse may be a positive temperature coefficient resettable fuse (PPTC). Figure 2 As shown, F1 is a positive temperature coefficient resettable fuse.

[0078] In addition, if Figure 2 As shown, the circuit may further include R5 / R6 as pull-up resistors.

[0079] It should be noted that the circuit may also include an optocoupler adjustment circuit to adjust the operating current of the optocoupler module U2. Optionally, the optocoupler adjustment circuit may be a resistor. For example, Figure 2 R8 shown is the optocoupler adjustment circuit.

[0080] Specifically, for example, Figure 2As shown, the current output end of the battery module in the power module 1, that is, the positive power supply end VBAT, is connected to the positive temperature coefficient resettable fuse F1, the current sensing resistor R1, and the signal flip circuit R3 / R2 / C1 / Q1 in the switch module 4, and is connected to the power supply end POWER_IN of the external BMS power supply circuit through the signal flip circuit R3 / R2 / C1 / Q1. The current output end of the low-power standby power module LDO in the power module 1, that is, the low-power standby power supply signal 3V3_STBY, is connected to VBAT through the positive temperature coefficient resettable fuse F1. The collection end of the operational amplifier comparator U1 in the control module 2, that is, the pin 8 is connected to the power supply end POWER_IN of the external BMS power supply circuit. The positive electrode VIN+ of the corresponding voltage acquisition terminal is connected to the positive power supply terminal VBAT through one end of the positive temperature coefficient self-recovery fuse F1. The negative electrode VIN- of the voltage acquisition terminal corresponding to pin 7 is connected to VBAT through the current detection resistors R1 and F1, that is, VIN+ and VIN- are connected to the two ends of the current detection resistor R1. The current output end of the low-power standby power module LDO in the power module 1, that is, the low-power standby power supply signal 3V3_STBY, is input into the low-power standby power supply signal U1 through the VS end corresponding to the pin 1 of the operational amplifier comparator U1. The voltage regulation circuit, that is, the voltage dividing resistors R7 and R9, are respectively connected to the pins of the operational amplifier comparator U1. The OUT terminal corresponding to pin 2 and the ground terminal GND corresponding to pin 4 are connected between R7 and R9, and the input terminal CMPIN corresponding to pin 3 of the operational amplifier comparator U1 is connected between R7 and R9. The control output terminal of the operational amplifier comparator U1, that is, the output terminal CMPOUT of pin 6, is connected to the input terminal 1 of the isolation module, that is, the optocoupler module U2 through R8. The output terminal 4 of the optocoupler module U2 is connected to the regulating capacitor C4 through the anti-reverse diode D2, and is connected to the control input terminal Q4 of the holding module, that is, the holding circuit R4 / R10 / R11 / R13 / Q2 / Q4 in the driving module 3 through the regulating capacitor C4. The signal output terminal Q2 of 4 is connected to the input terminal of the signal flipping circuit R12 / C2 / Q3, which is the signal flipping module in the driving module 3, and is connected to the input terminal of the signal flipping circuit R3 / R2 / C1 / Q1 through the driving output terminal of the signal flipping circuit R12 / C2 / Q3. In addition, the current output terminal 3V3_STBY of the low-power standby power module LDO is connected to the control output terminal of the operational amplifier comparator U1, which is the pin 6 output terminal CMPOUT terminal, and the output terminal 4 of the optical coupling module U2 through the pull-up resistors R5 and R6. Furthermore, the pin 6 output terminal CMPOUT terminal is connected to the input terminal 1 of the optical coupling module U2 through the resistor R8. Figure 2 , the protection process of the protection circuit 100 of the BMS power supply circuit is described:

[0081] 1. When the BMS power supply circuit consumes abnormal power:

[0082] When the power consumption of the power supply end POWER_IN of the BMS power supply circuit exceeds a certain value, that is, abnormal power consumption, the current passing through the two ends of the current sensing resistor R1 increases, and the voltage signal corresponding to the current is input to the positive and negative poles of the operational amplifier comparator U1 in the control module 2, namely VIN+ and VIN-, for amplification. After amplification, the control output end of the operational amplifier comparator U1, namely the pin 6 output end CMPOUT outputs the amplified signal, and the signal is isolated by the optocoupler module U2, protected by the anti-reverse diode D2, and pulled up by the pull-up resistor R5 / R6, and then output to the control input end Q4 of the holding module in the drive module 3, namely the holding circuit R4 / R10 / R11 / R13 / Q2 / Q4, to maintain the The signal is input to the signal flip module in the driving module 3, namely the signal flip circuit R12 / C2 / Q3, to realize the flip of the signal, and finally the signal flip circuit R3 / R2 / C1 / Q1 in the switch module is connected through the signal flip circuit R12 / C2 / Q3, wherein the signal passes through the signal flip circuit R12 / C2 / Q3 to reduce the driving signal of Q3, so that Q3 is turned off. At this time, the Vgs voltage of Q1 in the signal flip circuit R3 / R2 / C1 / Q1 becomes 0, and Vgs is used to control the switch state, which turns off Q1, thereby disconnecting the connection of the power supply terminal POWER_IN of the external BMS power supply circuit, thereby achieving the protection purpose under abnormal power consumption.

[0083] 2. When the BMS power supply circuit is short-circuited (back-end power failure):

[0084] 1. After the current collected by VIN+ and VIN of the operational amplifier comparator U1 in the control module 2 is amplified by the operational amplifier comparator U1, the control output terminal of the operational amplifier comparator U1, that is, the pin 6 output terminal CMPOUT outputs the amplified signal. The subsequent signal is output to the control input terminal Q4 after passing through the optical coupling module U2, the anti-reverse diode D2, and the pull-up resistor R5 / R6, and continues to be input to the signal flip circuit R12 / C2 / Q3, and finally connected to the signal flip circuit R3 / R2 / C1 / Q1, wherein the signal turns off Q3, and then the Vgs voltage of Q1 becomes 0, so that Q1 is turned off, thereby disconnecting the connection of POWER_IN, and realizing the protection when the BMS power supply circuit is short-circuited. The details will not be repeated here, and the process after the signal amplification when the BMS power supply circuit is short-circuited can be referred to.

[0085] 2. When the positive temperature coefficient resettable fuse F1 (PPTC) heats up, the resistance of F1 will increase, thereby presenting an open circuit state, and the low-power standby power module LDO in the power module 1 will be turned off, that is, the LDO cannot provide the low-power standby power supply signal 3V3_STBY to the protection circuit, causing Q3 to be turned off, and then Q1 to be turned off, thereby realizing protection when the BMS power supply circuit is short-circuited.

[0086] Therefore, the protection circuit of the BMS power supply circuit of the present application realizes protection of the BMS power supply circuit by turning off the switch module 4 when abnormal power consumption and short circuit occur in the BMS power supply circuit.

[0087] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the above-described device can be implemented in other ways. The above-described device embodiments are only illustrative, for example, the division of the mechanism is only a logical function division, and there may be other division methods in actual implementation.

[0088] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A protection circuit for a BMS power supply circuit, characterized in that: The protection circuit includes a power module, a control module, a drive module and a switch module; The current output end of the power module is connected to the power supply end of the external BMS power supply circuit through the switch module; the acquisition end of the control module is connected to the current output end of the power module, the control output end of the control module is connected to the control input end of the drive module, and the drive output end of the drive module is connected to the switch module.

2. The protection circuit according to claim 1, characterized in that: The power supply module is used to supply power to the protection circuit and the external BMS power supply circuit respectively; The control module is used to collect the current output by the power module and send a control signal to the driving module; The driving module is used to receive the control signal to drive the switch module to close, thereby disconnecting the power supply from the power supply module to the external BMS power supply circuit.

3. The protection circuit according to claim 1, characterized in that: The power supply module includes a battery module and a low-power standby power module; the current output end of the battery module is connected to the switch module, and is connected to the power supply end of the external BMS power supply circuit through the switch module, and the current output end of the low-power standby power module is respectively connected to the control module, the drive module and the switch module.

4. The protection circuit according to claim 3, characterized in that: The battery module is used to supply power to the external BMS power supply circuit, so as to disconnect the power supply to the external BMS power supply circuit when the switch module is turned off; The low-power standby power module is used to supply power to the protection circuit.

5. The protection circuit according to claim 1, characterized in that: The protection circuit further comprises an isolation module; the input end of the isolation module is connected to the control output end of the control module, and the output end of the isolation module is connected to the control input end of the driving module; The isolation module is used to isolate the control module from the drive module.

6. The protection circuit according to claim 5, characterized in that: The isolation module is an optical coupling module.

7. The protection circuit according to claim 1, characterized in that: The driving module includes a holding module and a signal flipping module; the control input end of the holding module is connected to the control output end of the control module, the signal output end of the holding module is connected to the input end of the signal flipping module, and the driving output end of the signal flipping module is connected to the switch module.

8. The protection circuit according to claim 7, characterized in that: The holding module is used to hold the state of the control signal output by the control module; The signal flipping module is used to flip the signal output by the holding module.

9. The protection circuit according to claim 1, characterized in that: The control module also includes a voltage regulating circuit; the voltage regulating circuit is connected to the control module; The voltage regulating circuit is used to regulate the voltage of the control module.

10. The protection circuit according to claim 1, characterized in that: The power module further includes a current-sensing resistor; the current-sensing resistor is connected to the collection end of the control module, and the current output end of the power module is connected to the switch module through the current-sensing resistor; The current-sensing resistor is used to detect the current output by the power module and output the current to the control module.

11. The protection circuit according to claim 5, characterized in that: The protection circuit further includes an adjustment capacitor; two ends of the adjustment capacitor are respectively connected to the output end of the isolation module and the control input end of the driving module; The regulating capacitor is used to adjust the time when the driving module drives the switch module to close.

12. The protection circuit according to claim 5, characterized in that: The protection circuit further includes an anti-reverse diode; one end of the anti-reverse diode is connected to the isolation module, and the other end is connected to the driving module; The anti-reverse diode is used to prevent reverse current or reverse voltage.

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