Power protection circuit and power protection system

文档序号：860761 发布日期：2021-03-16 浏览：4次中文

阅读说明：本技术 电源防护电路及电源防护系统 (Power protection circuit and power protection system ) 是由潘琪于 2020-12-14 设计创作，主要内容包括：本发明涉及一种电源防护电路及电源防护系统。该电源防护电路包括：过流保护模块,与所述电源防护电路的输入端相连接,用于防止浪涌及短路；电压监测模块,与所述过流保护模块相连接,用于监测电源电压,以及当所述电源电压低于预设低压值时,控制所述电源断开；滤波模块,与所述电压监测模块相连接,用于吸收浪涌和静电的部分频段的电压尖峰；浪涌防护模块,与所述滤波模块相连接,用于当输入所述浪涌防护模块的电压高于预设高压值时,控制所述电源断开；CE防护模块,用于防止所述电源内的开关频率串扰到外部电路。该电源防护电路及电源防护系统损坏比率低、设计成本低,并且能够通过ISO7637测试标准和欧美的CE认证。(The invention relates to a power supply protection circuit and a power supply protection system. The power protection circuit includes: the overcurrent protection module is connected with the input end of the power supply protection circuit and used for preventing surge and short circuit; the voltage monitoring module is connected with the overcurrent protection module and used for monitoring the power supply voltage and controlling the power supply to be disconnected when the power supply voltage is lower than a preset low-voltage value; the filtering module is connected with the voltage monitoring module and is used for absorbing voltage spikes of partial frequency bands of surge and static electricity; the surge protection module is connected with the filtering module and used for controlling the power supply to be disconnected when the voltage input into the surge protection module is higher than a preset high voltage value; and the CE protection module is used for preventing the switching frequency in the power supply from crosstalk to an external circuit. The power protection circuit and the power protection system have low damage ratio and low design cost, and can pass ISO7637 test standard and CE certification of Europe and America.)

1. A power protection circuit, comprising:

the overcurrent protection module is connected with the input end of the power supply protection circuit and used for preventing surge and short circuit;

the voltage monitoring module is connected with the overcurrent protection module and used for monitoring the power supply voltage and controlling the power supply to be disconnected when the power supply voltage is lower than a preset low-voltage value;

the filtering module is connected with the voltage monitoring module and is used for absorbing voltage spikes of partial frequency bands of surge and static electricity;

the surge protection module is connected with the filtering module and used for controlling the power supply to be disconnected when the voltage input into the surge protection module is higher than a preset high voltage value;

and the first end of the CE protection module is connected with the surge protection module, and the second end of the CE protection module is connected with the output end of the power supply protection circuit and used for preventing switching frequency in the power supply from crosstalk to an external circuit.

2. The power protection circuit of claim 1, wherein the over-current protection module comprises a fuse.

3. The power protection circuit of claim 1, wherein the voltage monitoring module comprises:

one end of the first voltage monitoring resistor, which is close to the overcurrent protection module, is connected with the first end of the filtering module;

one end of the second voltage monitoring resistor, which is close to the first voltage monitoring resistor, is connected with one end of the first voltage monitoring resistor, which is far away from the overcurrent protection module, and one end of the second voltage monitoring resistor, which is far away from the first voltage monitoring resistor, is connected with the second end of the filtering module;

the first voltage monitoring capacitor is connected with the second voltage monitoring resistor in parallel, one end of the first voltage monitoring capacitor is connected with one end, far away from the first voltage monitoring resistor, of the second voltage monitoring resistor and the second end of the filtering module, and the other end of the first voltage monitoring capacitor is connected with one end, connected with the first voltage monitoring resistor, of the second voltage monitoring resistor.

4. The power protection circuit of claim 3, wherein the voltage monitoring module further comprises a first transient voltage suppression diode, an anode of the first transient voltage suppression diode is connected to a terminal of the second voltage monitoring resistor away from the first voltage monitoring resistor, and a cathode of the first transient voltage suppression diode is connected to a terminal of the second voltage monitoring resistor close to the first voltage monitoring resistor.

5. The power protection circuit of claim 1, wherein the filtering module comprises a filtering capacitor.

6. The power protection circuit of claim 1, wherein the surge protection module comprises:

the first end of the absorption resistor is connected with the first end of the filtering module;

the cathode of the voltage-stabilizing tube is connected with the second end of the absorption resistor, and the anode of the voltage-stabilizing tube is connected with the second end of the filtering module;

the first end of the current-limiting resistor is connected with the second end of the absorption resistor and the negative electrode of the voltage-stabilizing tube;

the base electrode of the switching triode is connected with the second end of the current-limiting resistor;

the first voltage dividing resistor is connected with the switching triode in parallel, a first end of the first voltage dividing resistor is connected with an emitting electrode of the switching triode, a first end of the absorption resistor and a first end of the filtering module, and a second end of the first voltage dividing resistor is connected with a collecting electrode of the switching triode;

the MOS tube is used for being turned off when the input voltage is higher than a preset high-voltage value, the source electrode of the MOS tube is connected with the emitting electrode of the switching triode, the first end of the absorption resistor, the first end of the filtering module and the first end of the first divider resistor, the grid electrode of the MOS tube is connected with the collector electrode of the switching triode and the second end of the first divider resistor, and the drain electrode of the MOS tube is connected with the CE protection module;

and a first end of the second voltage-dividing resistor is connected with the grid electrode of the MOS tube, a second end of the first voltage-dividing resistor and the emitter electrode of the switching triode, and a second end of the second voltage-dividing resistor is grounded.

7. The power protection circuit of claim 1, wherein the surge protection module comprises:

a second transient voltage suppressor diode, a first end of the second transient voltage suppressor diode being connected to the first end of the filter module, a second end of the second transient voltage suppressor diode being connected to the second end of the filter module;

and the first end of the jumper inductor is connected with the first end of the second transient voltage suppression diode and the first end of the filtering module, and the second end of the jumper inductor is connected with the CE protection module.

8. The power protection circuit of claim 1, wherein the CE protection module comprises:

a first CE protection capacitor, wherein a first end of the first CE protection capacitor is connected with the surge protection module;

a first end of the second CE protection capacitor is connected with a second end of the first CE protection capacitor, and a second end of the second CE protection capacitor is grounded;

a third CE protection capacitor, a first end of the third CE protection capacitor being connected to a first end of the first CE protection capacitor and a first end of the surge protection module;

a first end of the fourth CE protection capacitor is connected with a second end of the third CE protection capacitor, and the second end of the fourth CE protection capacitor is grounded;

a first end of the CE protection inductor is connected with a first end of the first CE protection capacitor, a first end of the third CE protection capacitor and a first end of the surge protection module;

and a first end of the fifth CE protection capacitor is connected with the second end of the CE protection inductor, and a second end of the fifth CE protection capacitor is grounded.

9. The power protection circuit according to any one of claims 1-7, further comprising an anti-reverse module, wherein a first end of the anti-reverse module is connected to a current input end of the power supply, and a second end of the anti-reverse module is connected to the overcurrent protection module, for preventing a positive electrode and a negative electrode of the power supply from being reversely connected.

10. A power protection system comprising a power protection circuit as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of vehicle electronics, in particular to a power supply protection circuit and a power supply protection system.

Background

With the development of vehicle electronic technology, a large number of vehicle-mounted electronic devices are widely applied to automobiles, such as a vehicle-mounted navigation wireless communication system, a vehicle-mounted infrared high-definition camera system, a vehicle-mounted lighting system, a vehicle-mounted anti-theft system, a vehicle-mounted air conditioning system, a vehicle door control system and the like. Various vehicle-mounted electronic devices operate stably and cooperate with each other, and a stable power supply system is required. Therefore, the design of the high-performance vehicle-mounted power supply guarantees reliable operation of the vehicle-mounted electronic equipment. International standard ISO7637 specifies the surge test standard for vehicle-mounted electronic equipment, and only if the test strictly passes the standard, it is possible to ensure that the power supply circuit is reliable and durable in actual operation.

At present, most vehicle-mounted power supply systems control a switching power supply through a power supply front-end TVS (transient voltage suppression diode) and a single chip microcomputer system, and the chips have a wide voltage input range, but practice shows that if the power supply input part is not properly processed, the damage rate is high, and the design cost is high.

Disclosure of Invention

Based on this, it is necessary to provide a power protection circuit and a power protection system which have a low damage ratio and a low design cost, and can pass the ISO7637 test standard and CE certification in europe and america.

The application provides a power protection circuit, includes:

the overcurrent protection module is connected with the input end of the power supply protection circuit and used for preventing surge and short circuit;

the filtering module is connected with the voltage monitoring module and is used for absorbing voltage spikes of partial frequency bands of surge and static electricity;

In the power protection circuit provided in the above embodiment, the overcurrent protection module is used for protecting large current situations such as surge and possible short circuit; the voltage monitoring module is used for monitoring the power supply voltage in real time, controlling the on-off of a main power supply according to the read value of the power supply voltage, and actively cutting off the power supply under the condition of low voltage, so that the electric quantity of the power supply cannot be consumed by a terminal machine; the filtering module is used for absorbing voltage spikes of partial frequency bands of surge and static electricity; the surge protection module is used for realizing overvoltage protection; the CE protection module is used for preventing the switching frequency of the DC-DC from crosstalk to an external power supply, so that the CE test fails. The power protection circuit provided by the application has the advantages of low damage ratio and low design cost, and can output safe and reliable stable voltage by finishing the overcurrent, voltage monitoring, filtering, overvoltage and CE electromagnetic protection, so that the reliable operation of a system is ensured, and all standards of ISO7637 test and European and American CE authentication can be realized.

In one embodiment, the overcurrent protection module comprises a fuse.

In one embodiment, the voltage monitoring module comprises:

one end of the first voltage monitoring resistor, which is close to the overcurrent protection module, is connected with the first end of the filtering module;

In one embodiment, the voltage monitoring module further includes a first transient voltage suppression diode, an anode of the first transient voltage suppression diode is connected to one end of the second voltage monitoring resistor, which is far away from the first voltage monitoring resistor, and a cathode of the first transient voltage suppression diode is connected to one end of the second voltage monitoring resistor, which is near to the first voltage monitoring resistor.

In one embodiment, the filter module comprises a filter capacitor.

In one embodiment, the surge protection module comprises:

the first end of the absorption resistor is connected with the first end of the filtering module;

the first end of the current-limiting resistor is connected with the second end of the absorption resistor and the negative electrode of the voltage-stabilizing tube;

the base electrode of the switching triode is connected with the second end of the current-limiting resistor;

In one embodiment, the surge protection module comprises:

In one embodiment, the CE protection module includes:

a first CE protection capacitor, wherein a first end of the first CE protection capacitor is connected with the surge protection module;

a first end of the second CE protection capacitor is connected with a second end of the first CE protection capacitor, and a second end of the second CE protection capacitor is grounded;

a third CE protection capacitor, a first end of the third CE protection capacitor being connected to a first end of the first CE protection capacitor and a first end of the surge protection module;

a first end of the fourth CE protection capacitor is connected with a second end of the third CE protection capacitor, and the second end of the fourth CE protection capacitor is grounded;

and a first end of the fifth CE protection capacitor is connected with the second end of the CE protection inductor, and a second end of the fifth CE protection capacitor is grounded.

In one embodiment, the power supply further comprises an anti-reverse connection module, wherein a first end of the anti-reverse connection module is connected with the current input end of the power supply, and a second end of the anti-reverse connection module is connected with the overcurrent protection module and used for preventing the positive electrode and the negative electrode of the power supply from being reversely connected.

The present application further provides a power protection system, including the power protection circuit described in any of the above embodiments.

In the power protection circuit and the power protection system provided in the above embodiments, the overcurrent protection module is used to protect large current situations such as surge and possible short circuit; the voltage monitoring module is used for monitoring the power supply voltage in real time, controlling the on-off of a main power supply according to the read value of the power supply voltage, and actively cutting off the power supply under the condition of low voltage, so that the electric quantity of the power supply cannot be consumed by a terminal machine; the filtering module is used for absorbing voltage spikes of partial frequency bands of surge and static electricity; the surge protection module is used for realizing overvoltage protection; the CE protection module is used for preventing the switching frequency of the DC-DC from crosstalk to an external power supply, so that the CE test fails. The power protection circuit provided by the application has the advantages of low damage ratio and low design cost, and can output safe and reliable stable voltage by finishing the overcurrent, voltage monitoring, filtering, overvoltage and CE electromagnetic protection, so that the reliable operation of a system is ensured, and all standards of ISO7637 test and European and American CE authentication can be realized.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a circuit diagram of a power protection circuit provided in an embodiment of the present application.

Description of reference numerals:

the device comprises a 1-overcurrent protection module, a 2-voltage monitoring module, a 3-filtering module, a 4-surge protection module, a 5-CE protection module and a 6-reverse connection prevention module.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, the first voltage-monitoring resistance may be referred to as a second voltage-monitoring resistance, and similarly, the second voltage-monitoring resistance may be referred to as a first voltage-monitoring resistance, without departing from the scope of the present application. The first voltage-monitoring resistance and the second voltage-monitoring resistance are both voltage-monitoring resistances, but are not the same voltage-monitoring resistance.

It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

As shown in fig. 1, the present application provides a power protection circuit, comprising:

the overcurrent protection module 1 is connected with the input end of the power supply protection circuit and used for preventing surge and short circuit;

the voltage monitoring module 2 is connected with the overcurrent protection module 1 and used for monitoring the power supply voltage and controlling the power supply to be disconnected when the power supply voltage is lower than a preset low-voltage value;

the filtering module 3 is connected with the voltage monitoring module 2 and is used for absorbing voltage spikes of partial frequency bands of surge and static electricity;

the surge protection module 4 is connected with the filtering module 3 and used for controlling the power supply to be disconnected when the voltage input into the surge protection module 4 is higher than a preset high voltage value;

and a first end of the CE protection module 5 is connected with the surge protection module 4, and a second end of the CE protection module 5 is connected with an output end of the power supply protection circuit, so as to prevent switching frequency in the power supply from crosstalk to an external circuit.

In the power protection circuit provided in the above embodiment, the overcurrent protection module 1 is used to protect large current situations such as surge and possible short circuit; the voltage monitoring module 2 is used for monitoring the power supply voltage in real time, controlling the on-off of a main power supply according to the read value of the power supply voltage, and actively cutting off the power supply under the condition of low voltage, so that the electric quantity of the power supply cannot be consumed by a terminal machine; the filtering module 3 is used for absorbing voltage spikes of partial frequency bands of surge and static electricity; the surge protection module 4 is used for realizing overvoltage protection; the CE protection module 5 is used to prevent the switching frequency of the DC-DC from crosstalk to the external power source, resulting in failure of the CE test. The power protection circuit provided by the application has the advantages of low damage ratio and low design cost, and can output safe and reliable stable voltage by finishing the overcurrent, voltage monitoring, filtering, overvoltage and CE electromagnetic protection, so that the reliable operation of a system is ensured, and all standards of ISO7637 test and European and American CE authentication can be realized.

In one embodiment, the overcurrent protection module 1 includes a fuse F1.

Specifically, in the embodiment, the fuse F1 is used at the input terminal of the power protection circuit for protecting against high current conditions such as surge and possible short circuit. Preferably, the fuse F1 may be a self-recovery fuse (PTC fuse), so that the fuse can automatically recover after the overcurrent is removed, thereby avoiding difficulty in assembly and disassembly. The type of fuse F1 is selected to take into account the temperature rise effect, its maximum operating current (I)_h) The maximum operating current of the fuse F1 may be 0.6A-1A, specifically 0.6A, 0.7A, 0.8A, or 0.9A, and the maximum operating current of the fuse F1 is not limited in this embodiment, because a certain margin is required to be kept, generally, the maximum operating current of the vehicle-mounted power supply is about 0.55A or less.

In one embodiment, the voltage monitoring module 2 includes:

one end of the first voltage monitoring resistor R12 close to the overcurrent protection module 1 is connected with the first end of the filtering module 3;

one end of the second voltage monitoring resistor R11 close to the first voltage monitoring resistor R12 is connected to one end of the first voltage monitoring resistor R12 far from the overcurrent protection module 1, and one end of the second voltage monitoring resistor R11 far from the first voltage monitoring resistor R12 is connected to a second end of the filtering module 3;

the first voltage monitoring capacitor C10 is connected in parallel with the second voltage monitoring resistor R11, one end of the first voltage monitoring capacitor C10 is connected to one end of the second voltage monitoring resistor R11, which is far away from the first voltage monitoring resistor R12, and the second end of the filter module 3, and the other end of the first voltage monitoring capacitor C10 is connected to one end of the second voltage monitoring resistor R11, which is connected to the first voltage monitoring resistor R12.

In the power protection circuit provided by the embodiment, the voltage monitoring module 2 is used for monitoring the power voltage in real time, controlling the on-off of the main power supply according to the read value of the power voltage, and actively cutting off the power supply under the condition of low voltage, so that the electric quantity of the power supply cannot be consumed by a terminal machine.

Optionally, in one embodiment, the voltage monitoring module 2 further includes a first transient voltage suppression diode D4, an anode of the first transient voltage suppression diode D4 is connected to an end of the second voltage monitoring resistor R11 away from the first voltage monitoring resistor R12, and a cathode of the first transient voltage suppression diode D4 is connected to an end of the second voltage monitoring resistor R11 close to the first voltage monitoring resistor R12.

It should be noted that the first transient voltage suppression diode D4 in the above embodiment is a reserved device, and may be actually attached in a null manner.

In one embodiment, the filter module 3 includes a filter capacitor C10.

In the power protection circuit provided in the above embodiment, the filtering module 3 is configured to absorb voltage spikes of a partial frequency band of surge and static electricity. The filter capacitor C10 may have different capacitance values selected according to the actual application to make the power supply conform to electromagnetic interference (EMI) standards. Preferably, the filter capacitor C10 may be a high-voltage capacitor of 250V-0.1uF-1206, or may also be a high-voltage tantalum capacitor, a high-voltage aluminum electrolytic capacitor, or other capacitors meeting the standard, and the type and capacitance value of the filter capacitor C10 are not limited in this embodiment.

In the power protection circuit provided in the above embodiment, the surge protection module 4 may be compatible with two surge protection schemes, and the two surge protection schemes are specifically described below:

optionally, in one embodiment, the surge protection module 4 includes:

the first end of the absorption resistor R42 is connected with the first end of the filtering module 3;

a cathode of the voltage regulator tube D12 is connected with a second end of the absorption resistor R42, and an anode of the voltage regulator tube D12 is connected with a second end of the filter module 3;

the first end of the current-limiting resistor R107 is connected with the second end of the absorbing resistor R42 and the negative electrode of the voltage regulator tube D12;

a switch transistor Q17, wherein the base of the switch transistor Q17 is connected with the second end of the current-limiting resistor R107;

the first voltage-dividing resistor R108 is connected in parallel with the switching transistor Q17, a first end of the first voltage-dividing resistor R108 is connected with an emitter of the switching transistor Q17, a first end of the absorbing resistor R42 and a first end of the filtering module 3, and a second end of the first voltage-dividing resistor R108 is connected with a collector of the switching transistor Q17;

the MOS tube Q8 is used for being turned off when the input voltage is higher than a preset high voltage value, the source electrode of the MOS tube Q8 is connected with the emitting electrode of the switching triode Q17, the first end of the absorption resistor R42, the first end of the filtering module 3 and the first end of the first divider resistor R108, the grid electrode of the MOS tube Q8 is connected with the collecting electrode of the switching triode Q17 and the second end of the first divider resistor R108, and the drain electrode of the MOS tube Q8 is connected with the CE protection module 5;

a second voltage-dividing resistor R109, a first end of the second voltage-dividing resistor R109 is connected to the gate of the MOS transistor Q8, a second end of the first voltage-dividing resistor R108, and the emitter of the switching transistor Q17, and a second end of the second voltage-dividing resistor R109 is grounded.

The power protection circuit provided by the above embodiment can pass all surge test standards (the most strict parameters, such as 24V 5a, Us 202V, Ri 1 Ω, Td 350ms, and Tr 10-5ms) for 12V/24V pairs of ISO 7637-2// ISO16750-2, and can realize overvoltage protection. The highest direct-current input voltage of a general vehicle-mounted power supply complete machine is 36V, and optionally, when the input voltage of the power supply protection circuit provided by the embodiment is higher than 36V, the surge protection module 4 acts, the MOS transistor Q8 is turned off, and at the moment, a rear-stage circuit is cut off, so that overvoltage protection is realized.

In another embodiment, the surge protection module 4 includes:

a second tvs D9, a first terminal of the second tvs D9 is connected to the first terminal of the filter module 3, and a second terminal of the second tvs D9 is connected to the second terminal of the filter module 3;

a jumper inductor L7, a first terminal of the jumper inductor L7 is connected to the first terminal of the second tvs D9 and the first terminal of the filter module 3, and a second terminal of the jumper inductor L7 is connected to the CE protection module 5.

The power protection circuit provided by the embodiment can pass 12V/24V pulse1-4 and 12V 5a in ISO 7637-2// ISO16750-2, and has the advantages of fewer used devices and low design cost.

EN301489 is a relevant electromagnetic compatibility standard for radio equipment and services, which is required to be tested by electronic equipment exported to Europe and America, CE is an important index in overall electromagnetic compatibility (EMC) performance, and corresponding protection design is required. The CE interference source on most products is mainly the switching frequency of DC-DC, so the input of the main power supply needs to be designed with relevant protection. The CE protection module 5 is explained in detail below.

In one embodiment, the CE protection module 5 includes:

a first CE protection capacitor C71, wherein a first end of the first CE protection capacitor C71 is connected with the surge protection module 4;

a second CE protection capacitor C72, a first terminal of the second CE protection capacitor C72 being connected to a second terminal of the first CE protection capacitor C71, a second terminal of the second CE protection capacitor C72 being grounded;

a third CE protection capacitor C73, wherein a first end of the third CE protection capacitor C73 is connected to a first end of the first CE protection capacitor C71 and a first end of the surge protection module 4;

a fourth CE protection capacitor C74, a first end of the fourth CE protection capacitor C74 being connected to a second end of the third CE protection capacitor C73, a second end of the fourth CE protection capacitor C74 being grounded;

a first end of the CE protection inductor L8, a first end of the CE protection inductor L8 is connected to a first end of the first CE protection capacitor C71, a first end of the third CE protection capacitor C73, and a first end of the surge protection module 4;

a first terminal of a fifth CE protection capacitor C75, C75 is connected to the second terminal of the CE protection inductor L8, and a second terminal of the fifth CE protection capacitor C75 is grounded.

The CE protection scheme adopted in the power protection circuit provided in the above embodiment is a pi filter circuit, that is, a pi filter circuit composed of C71+ C72, C73+ C74, C75, and L8, to optimize the board area design. Optionally, C71, C72, C73, C74 and C75 are all 36V to 60V withstand voltages, 50V withstand voltage is preferred in the above embodiment, and the withstand voltage value and the capacitance value of the CE protection capacitor are not limited in this embodiment; similarly, the size of the CE protection inductor L8 is not limited in this embodiment.

In one embodiment, the power protection circuit further includes an anti-reverse module 6, a first end of the anti-reverse module 6 is connected to the filtering module 3, and a second end of the anti-reverse module 6 is connected to the surge protection module 4, so as to prevent the positive electrode and the negative electrode of the power supply from being reversely connected.

The present application further provides a power protection system, including the power protection circuit described in any of the above embodiments.

In the description herein, references to the description of "one embodiment," "some embodiments," "other embodiments," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

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