CN217789298U - Power protection circuit, device and vehicle - Google Patents

Abstract

The application provides a power protection circuit, device and vehicle, the circuit includes: the overcurrent and overvoltage protection circuit comprises an overcurrent and overvoltage protection module and a differential mode filtering module, wherein the first end of the overcurrent and overvoltage protection module is connected with the output end of a power supply, the second end of the overcurrent and overvoltage protection circuit is connected with the input end of the power supply, the first end of the differential mode filtering module is connected with the third end of the overcurrent and overvoltage protection module, the second end of the differential mode filtering module is connected with the fourth end of the overcurrent and overvoltage protection module, the third end of the differential mode filtering module is connected with the input end of a load, and the fourth end of the differential mode filtering module is connected with the output end of the load. When overcurrent and overvoltage occurs, the overcurrent and overvoltage protection module automatically breaks and automatically restores a path to avoid the influence of overcurrent and overvoltage on a rear-stage load, and the differential mode filtering module filters signals in a circuit to improve the electromagnetic compatibility of a power supply network where the power supply protection circuit is located, and has protection and filtering functions and high reliability.

Description

Power protection circuit, device and vehicle

technical field

The present application relates to the field of electronic technology, in particular to a power supply protection circuit, device and vehicle.

Background technique

As the power supply device of the terminal, the power supply provides the load with the voltage and current required for normal operation. In order to improve the safety and reliability of power supply, a protection circuit is usually added between the power supply and the load. However, in related technologies, the function of the protection circuit is single and the reliability is low. not tall.

Utility model content

This application aims to solve one of the technical problems in the related art at least to a certain extent.

Therefore, the first purpose of the present application is to propose a power protection circuit to enhance the diversity of power protection functions and improve the reliability of the circuit.

The second purpose of the present application is to propose a power protection device.

A third object of the present application is to propose a vehicle.

In order to achieve the above purpose, the first aspect of the present application proposes a power supply protection circuit, including: an overcurrent and overvoltage protection module, the first end of the overcurrent and overvoltage protection module is connected to the output end of the power supply, the overcurrent The second end of the overvoltage protection circuit is connected to the input end of the power supply, and the overcurrent and overvoltage protection module is used to adjust the path state according to the input DC signal, and control the DC signal in the power supply protection circuit to be within a preset voltage range ; Differential mode filter module, the first end of the differential mode filter module is connected to the third end of the overcurrent and overvoltage protection module, and the second end of the differential mode filter module is connected to the overcurrent and overvoltage protection module connected to the fourth terminal of the differential mode filter module, the third terminal of the differential mode filter module is connected to the input terminal of the load, the fourth terminal of the differential mode filter module is connected to the output terminal of the load, and the differential mode filter module is used for Filter out the differential mode signal in the DC signal input to the differential mode filtering module.

The power supply protection circuit proposed in this application includes: an overcurrent and overvoltage protection module, the first terminal of the overcurrent and overvoltage protection module is connected to the output terminal of the power supply, and the second terminal of the overcurrent and overvoltage protection circuit is connected to the power supply The input terminal of the overcurrent and overvoltage protection module is used to adjust the path state according to the input DC signal, and control the DC signal in the power supply protection circuit to be within the preset voltage range; the differential mode filter module, the differential mode The first end of the filter module is connected to the third end of the overcurrent and overvoltage protection module, the second end of the differential mode filter module is connected to the fourth end of the overcurrent and overvoltage protection module, and the differential mode The third terminal of the filter module is connected to the input terminal of the load, the fourth terminal of the differential mode filter module is connected to the output terminal of the load, and the differential mode filter module is used to filter the input to the differential mode filter module The differential mode signal in the DC signal. This application uses the overcurrent and overvoltage protection module to automatically disconnect and automatically restore the path during overcurrent and overvoltage to avoid the impact of overcurrent and overvoltage on the subsequent load, and to filter the signal in the circuit through the differential mode filter module to Improve the electromagnetic compatibility performance of the power supply network where the power supply protection circuit is located, taking into account protection and filtering functions, and high reliability.

In addition, the power supply protection circuit proposed in the first aspect of the present application may also have the following additional technical features:

Further, the power supply protection circuit further includes: an anti-reverse connection protection module, the first end of the anti-reverse connection protection module is connected to the third end of the overcurrent and overvoltage protection module, and the anti-reverse connection protection module The second end of the overcurrent and overvoltage protection module is connected to the fourth end of the overcurrent and overvoltage protection module, the third end of the anti-reverse connection protection module is connected to the first end of the differential mode filter module, and the anti-reverse connection protection module The fourth terminal of the differential mode filter module is connected to the second terminal of the differential mode filter module, and the anti-reverse connection protection module is used to cut off when the power supply protection circuit is reversely connected to the input terminal of the power supply and the output terminal of the power supply open the way.

Further, the power supply protection circuit further includes: a common mode filter, the first terminal of the common mode filter is connected to the third terminal of the overcurrent and overvoltage protection module, and the second terminal of the common mode filter terminal is connected to the fourth terminal of the overcurrent high voltage protection circuit, the third terminal of the common mode filter is connected to the first terminal of the anti-reverse connection protection module, and the fourth terminal of the common mode filter is connected to the The second end of the anti-reverse connection protection module is connected, and the common-mode filter is used to filter out common-mode signals generated by the anti-reverse connection protection module and the differential-mode filter module.

Further, the overcurrent and overvoltage protection module includes: a resettable fuse, the first end of the resettable fuse is used as the first end of the overcurrent and overvoltage protection module; a first diode, the first The first end of a diode is connected to the second end of the resettable fuse, and the second end of the first diode is used as the second end of the overcurrent and overvoltage protection module; the first capacitor, the The first end of the first capacitor is connected to the second end of the resettable fuse, the second end of the first capacitor is connected to the second end of the first diode, and the second end of the first capacitor One end serves as the third end of the overcurrent and high voltage protection module, and the second end of the first capacitor serves as the fourth end of the overcurrent and overvoltage protection module.

Further, the anti-reverse connection protection module includes: a first resistor, the first end of the first resistor serves as the first end of the anti-reverse connection protection module and the third end of the anti-reverse connection protection module ; A second resistor, the first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is used as the fourth end of the anti-reverse connection protection module; the second A capacitor, the first end of the second capacitor is connected to the second end of the first resistor, the second end of the second capacitor is connected to the second end of the second resistor; the second diode, The first end of the second diode is connected to the second end of the first resistor, and the second end of the second diode is connected to the second end of the second resistor; the triode, the The gate of the triode is connected to the second end of the first resistor, the drain of the triode is used as the second end of the anti-reverse connection protection module, the source of the triode is connected to the second end of the second resistor end connection.

Further, the differential mode filter module includes: a magnetic bead, the first end of the magnetic bead is used as the first end of the differential mode filter module, and the second end of the magnetic bead is used as the first end of the differential mode filter module. The third end; the third capacitor, the first end of the third capacitor is connected to the first end of the magnetic bead, and the second end of the third capacitor is used as the second end of the differential mode filter module and the second end of the differential mode filter module. The fourth end of the differential mode filter circuit; the fourth capacitor, the first end of the fourth capacitor is connected to the second end of the magnetic bead, the second end of the fourth capacitor is connected to the third capacitor The second end is connected.

Further, the second diode is a Zener diode.

Further, the triode is an N-type metal oxide field effect transistor.

To achieve the above purpose, the second aspect of the present application provides a power protection device, including: the power protection circuit described in the embodiment of the first aspect of the present application.

The power supply protection device of this application automatically disconnects and automatically restores the path through the overcurrent and overvoltage protection module during overcurrent and overvoltage, avoiding the impact of overcurrent and overvoltage on the subsequent load, and through the differential mode filter module. The signal is filtered to improve the electromagnetic compatibility performance of the power supply network where the power supply protection circuit is located, taking into account the protection and filtering functions, and has high reliability.

To achieve the above purpose, the third aspect of the present application provides a vehicle, including the power protection device as described in the embodiment of the second aspect of the present application.

In the vehicle of this application, the overcurrent and overvoltage protection module automatically disconnects and automatically restores the path when the overcurrent and overvoltage occur, avoiding the impact of overcurrent and overvoltage on the subsequent load, and the signal in the circuit is processed by the differential mode filter module. Filtering to improve the electromagnetic compatibility performance of the power supply network where the power supply protection circuit is located, taking into account both protection and filtering functions, and high reliability.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of a power supply protection circuit according to an embodiment of the present application;

2 is a schematic diagram of a power protection circuit according to another embodiment of the present application;

3 is a schematic diagram of a power protection circuit according to another embodiment of the present application;

4 is a schematic diagram of the overall structure of a power supply protection circuit according to another embodiment of the present application;

5 is a block diagram of a power protection device according to an embodiment of the present application;

FIG. 6 is a block diagram of a vehicle according to one embodiment of the application.

Detailed ways

Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are intended to explain the present application, and should not be construed as limiting the present application.

The power supply protection circuit, device and vehicle of the embodiments of the present application will be described below in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of a power supply protection circuit according to an embodiment of the present application.

As shown in FIG. 1 , the power supply protection circuit 1 of the embodiment of the present application may include: an overcurrent and overvoltage protection module 10 and a differential mode filter module 20 .

Wherein, the first end of the overcurrent and overvoltage protection module 10 is connected to the output end of the power supply through the DC bus, and the second end of the overcurrent and overvoltage protection circuit 10 is connected to the input end of the power supply through the DC bus; The first end is connected to the third end of the overcurrent and overvoltage protection module 10 through a DC bus, and the second end of the differential mode filter module 20 is connected to the fourth end of the overcurrent and overvoltage protection module 10 through a DC bus. The third terminal of 20 is connected to the input terminal of the load through the DC bus, and the fourth terminal of the differential mode filter module 20 is connected to the output terminal of the load through the DC bus.

The overcurrent and overvoltage protection module 10 adjusts the path state of the overcurrent and overvoltage protection module 10 according to the DC signal input from the output terminal of the power supply to the power supply protection circuit. When the power supply protection circuit has overcurrent or overheating, the overcurrent and overvoltage The protection module 10 disconnects the path, and automatically restores the state of the path when the current and temperature return to normal. When the power supply protection circuit has an overvoltage condition, the overcurrent and overvoltage protection module 10 adjusts the voltage of the path to control the DC signal in the power supply protection circuit. Within the preset voltage range, so as to avoid the impact of overcurrent and overvoltage on the subsequent load.

The differential mode filter module 20 is configured to filter out the differential mode signal in the DC signal input to the differential mode filter module 20 , so as to provide a low-noise DC signal for an external load.

The power supply protection circuit proposed in this application includes: an overcurrent and overvoltage protection module, the first end of the overcurrent and overvoltage protection module is connected to the output end of the power supply, and the second end of the overcurrent and overvoltage protection circuit is connected to the input end of the power supply , the overcurrent and overvoltage protection module is used to adjust the channel state according to the input DC signal, and control the DC signal in the power supply protection circuit to be within the preset voltage range; the differential mode filter module, the first terminal of the differential mode filter module and the overcurrent pass The third terminal of the differential mode filter module is connected to the fourth terminal of the overcurrent and overvoltage protection module, the third terminal of the differential mode filter module is connected to the input terminal of the load, and the differential mode filter module's The fourth terminal is connected to the output terminal of the load, and the differential mode filter module is used to filter the differential mode signal in the DC signal input to the differential mode filter module. This application uses the overcurrent and overvoltage protection module to automatically disconnect and automatically restore the path during overcurrent and overvoltage to avoid the impact of overcurrent and overvoltage on the subsequent load, and to filter the signal in the circuit through the differential mode filter module to Improve the electromagnetic compatibility performance of the power supply network where the power supply protection circuit is located, taking into account protection and filtering functions, and high reliability.

On the basis of the above embodiments, as shown in FIG. 2 , the output control circuit 1 of the embodiment of the present application may further include: an anti-reverse connection protection module 30 .

The overcurrent and overvoltage protection module 10 is connected to the differential mode filter module 20 through the anti-reverse connection protection module 30, wherein the first end of the anti-reverse connection protection module 30 is connected to the third end of the overcurrent and overvoltage protection module 10 through a DC bus, The second end of the anti-reverse connection protection module 30 is connected to the fourth end of the overcurrent and overvoltage protection module 10 through the DC bus, and the third end of the anti-reverse connection protection module 30 is connected to the first end of the differential mode filter module 20 through the DC bus. The fourth end of the anti-reverse connection protection module 30 is connected to the second end of the differential mode filter module 20 through a DC bus.

The anti-reverse connection protection module 30 is used to provide anti-reverse connection protection for the power supply network where the power supply protection circuit is located, so as to prevent damage to subsequent loads caused by reverse connection of power supply polarity. In some embodiments, when the power supply protection circuit is reversely connected to the input terminal of the power supply and the output terminal of the power supply, the path is disconnected, for example, when the first terminal of the overcurrent and overvoltage protection module 10 is connected to the input terminal of the power supply (the negative pole of the power supply) When the second terminal of the overcurrent and overvoltage protection module 10 is connected to the output terminal of the power supply (the positive pole of the power supply), the path is disconnected.

On the basis of the above embodiments, as shown in FIG. 3 , the output control circuit 1 of the embodiment of the present application may further include: a common mode filter FL1.

The first end of the common mode filter FL1 is connected to the third end of the overcurrent and overvoltage protection module 10 through the DC bus, and the second end of the common mode filter FL1 is connected to the fourth end of the overcurrent and overvoltage protection circuit through the DC bus. , the third end of the common-mode filter FL1 is connected to the first end of the anti-reverse connection protection module 30 through a DC bus, and the fourth end of the common-mode filter FL1 is connected to the second end of the anti-reverse connection protection module 30 through a DC bus .

The common-mode filter FL1 is used to filter out the common-mode signal in the post-stage load, for example, to filter out the common-mode signal generated by the anti-reverse connection protection module 30 and the differential mode filter module 20, so as to reduce the electromagnetic interference (ElectromagneticInterference , referred to as EMI).

As a feasible implementation, as shown in FIG. 4, the overcurrent and overvoltage protection module 10 includes: a resettable fuse F1, a first diode D1, and a first capacitor C1, wherein the first end of the resettable fuse F1 The first end of the overcurrent and overvoltage protection module is connected to the output end of the power supply; the first end of the first diode D1 is connected to the second end of the resettable fuse F1, and the second end of the first diode D1 serves as The second end of the overcurrent and overvoltage protection module 10 is connected to the input end of the power supply; the first end of the first capacitor C1 is connected to the second end of the resettable fuse F1, and the second end of the first capacitor C1 is connected to the first two-pole The second end of the tube D1 is connected, the first end of the first capacitor C1 is connected to the first end of the common mode filter FL1 as the third end of the overcurrent high voltage protection module 10, and the second end of the first capacitor C1 is used as the overcurrent The fourth terminal of the voltage protection module 10 is connected to the second terminal of the common mode filter FL1.

In some embodiments, the self-recovery fuse F1 will automatically disconnect when the entire circuit is over-current and overheated to protect it, and it will automatically restore the circuit state when the current and temperature are normal, so as to ensure that the power supply can normally supply power to the subsequent load, and can be reused , high reliability.

In some embodiments, the first diode D1 is a transient voltage suppression diode (TVS for short), and when the entire circuit is overvoltage, the first diode D1 is turned on to clamp the voltage to the required voltage range , so that the overvoltage will not affect the subsequent load, the first diode D1 is combined with the resettable fuse F1 and the first capacitor C1 to perform overcurrent and overvoltage protection for the entire power supply network where the power supply protection circuit is located.

As shown in Figure 4, the anti-reverse connection protection module includes: a first resistor R1, a second resistor R2, a second capacitor C1, a second diode D2 and a transistor Q1, wherein the first end of the first resistor R1 serves as The first end of the anti-reverse connection protection module 30 is connected to the third end of the common-mode filter FL1, and the first end of the first resistor R1 is also used as the third end of the anti-reverse connection protection module 30 and the third end of the differential-mode filter 20. One end is connected; the first end of the second resistor R2 is connected to the second end of the first resistor, and the second end of the second resistor R2 is used as the fourth end of the anti-reverse connection protection module 30 and the first end of the differential mode filter 20 The two ends are connected; the first end of the second capacitor C2 is connected to the second end of the first resistor R1, the second end of the second capacitor C2 is connected to the second end of the second resistor R2; the second end of the second diode D2 One end is connected to the second end of the first resistor R1, the second end of the second diode D2 is connected to the second end of the second resistor R2; the gate of the triode Q1 is connected to the second end of the first resistor R1, The drain of the transistor Q1 serves as the second end of the anti-reverse connection protection module 30 and is connected to the fourth end of the common mode filter, and the source of the transistor Q1 is connected to the second end of the second resistor R2.

In some embodiments, the triode Q1 is an N-type metal oxide field effect transistor, which provides anti-reverse connection protection for the entire power supply network where the power supply protection circuit is located, and prevents the reverse polarity of the power supply from causing damage to the subsequent load; the first resistor The main function of R1, the second resistor R2, the second capacitor C2, and the second diode D2 is to protect the voltage VGS between the gate (G pin) and the source (S pin) of the triode Q, so that VGS will not change suddenly, Overvoltage, so that the N channel of the triode Q1 can be normally opened or closed to prevent reverse connection. In addition, the clamping characteristics of the second diode D2 are used to protect the G and S pins of the triode Q1. At the same time, the G pin and S pin of the transistor Q1 have extremely low impedance when they are turned on, which will not consume too much energy and improve the efficiency of the power supply network.

As shown in FIG. 4, the differential mode filter module 20 includes: a magnetic bead L1, a third capacitor C3, and a fourth capacitor C4, wherein the first end of the magnetic bead L1 is used as the first end of the differential mode filter module 20 to prevent reverse connection The third end of the protection module 30 is connected, the second end of the magnetic bead L1 is connected to the input end of the load as the third end of the differential mode filter module 20; the first end of the third capacitor C3 is connected to the first end of the magnetic bead L1 , the second terminal of the third capacitor C3 is connected to the fourth terminal of the anti-reverse connection protection module 30 as the second terminal of the differential mode filter module 20, and the second terminal of the third capacitor C3 is also used as the fourth terminal of the differential mode filter circuit 20 terminal is connected to the output terminal of the load; the first terminal of the fourth capacitor C4 is connected to the second terminal of the bead L1, and the second terminal of the fourth capacitor C4 is connected to the second terminal of the third capacitor C3.

In summary, the power supply protection circuit proposed in this application includes: an overcurrent and overvoltage protection module, the first terminal of the overcurrent and overvoltage protection module is connected to the output terminal of the power supply, and the second terminal of the overcurrent and overvoltage protection circuit is connected to the output terminal of the power supply. The input terminal is connected, the overcurrent and overvoltage protection module is used to adjust the channel state according to the input DC signal, and the DC signal in the control power supply protection circuit is within the preset voltage range; the differential mode filter module, the first terminal of the differential mode filter module is connected to the The third terminal of the overcurrent and overvoltage protection module is connected, the second terminal of the differential mode filter module is connected to the fourth terminal of the overcurrent and overvoltage protection module, the third terminal of the differential mode filter module is connected to the input terminal of the load, and the differential mode filter module is connected to the fourth terminal of the overcurrent and overvoltage protection module. The fourth terminal of the filter module is connected to the output terminal of the load, and the differential mode filter module is used to filter out the differential mode signal in the DC signal input to the differential mode filter module. This application uses the overcurrent and overvoltage protection module to automatically disconnect and automatically restore the path during overcurrent and overvoltage to avoid the impact of overcurrent and overvoltage on the subsequent load, and to filter out common-mode signals through a common-mode filter to reduce the impact on The electromagnetic interference at the input end of the power supply, through the anti-reverse connection protection module, prevents the damage to the subsequent load due to the reverse connection of the power supply polarity, and performs differential-mode filtering on the signal in the circuit through the differential-mode filter module, so as to improve the power supply protection circuit where the power supply protection circuit is located. For the electromagnetic compatibility performance of the network, this application takes into account the protection and filtering functions, which can be compared with high reliability.

In order to realize the foregoing embodiments, the embodiments of the present application further provide a power protection device.

As shown in FIG. 5 , the controller 50 proposed in the embodiment of the present application may specifically include: the power supply protection circuit 1 shown in any of the above-mentioned embodiments.

The power supply protection device of the embodiment of the present application automatically disconnects and automatically restores the path through the overcurrent and overvoltage protection module to avoid the influence of overcurrent and overvoltage on the subsequent load. The signal in the circuit is filtered to improve the electromagnetic compatibility performance of the power supply network where the power supply protection circuit is located, taking into account the protection and filtering functions, and has high reliability.

In order to realize the foregoing embodiments, the embodiments of the present application further provide a vehicle.

As shown in FIG. 6 , the vehicle 60 proposed in the embodiment of the present application may specifically include: a power protection device 50 as shown in FIG. 5 .

In the vehicle of the embodiment of the present application, the overcurrent and overvoltage protection module automatically disconnects and automatically restores the path when the overcurrent and overvoltage occur, avoiding the impact of overcurrent and overvoltage on the subsequent load, and the differential mode filter module controls the The signal is filtered to improve the electromagnetic compatibility performance of the power supply network where the power supply protection circuit is located, taking into account the protection and filtering functions, and has high reliability.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present application, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. A power protection circuit, comprising:

the overcurrent and overvoltage protection module is used for adjusting the state of a channel according to an input direct current signal and controlling the direct current signal in the power supply protection circuit to be within a preset voltage range;

the first end of the differential mode filtering module is connected with the third end of the over-current and over-voltage protection module, the second end of the differential mode filtering module is connected with the fourth end of the over-current and over-voltage protection module, the third end of the differential mode filtering module is connected with the input end of a load, the fourth end of the differential mode filtering module is connected with the output end of the load, and the differential mode filtering module is used for filtering differential mode signals in direct current signals input to the differential mode filtering module.

2. The power protection circuit according to claim 1, further comprising:

the protection circuit comprises an anti-reverse-connection protection module, wherein a first end of the anti-reverse-connection protection module is connected with a third end of the overcurrent and overvoltage protection module, a second end of the anti-reverse-connection protection module is connected with a fourth end of the overcurrent and overvoltage protection module, a third end of the anti-reverse-connection protection module is connected with a first end of the differential mode filtering module, a fourth end of the anti-reverse-connection protection module is connected with a second end of the differential mode filtering module, and the anti-reverse-connection protection module is used for disconnecting a circuit when the power supply protection circuit is reversely connected with an input end of the power supply and an output end of the power supply.

3. The power protection circuit according to claim 2, further comprising:

the first end of the common mode filter is connected with the third end of the overcurrent and overvoltage protection module, the second end of the common mode filter is connected with the fourth end of the overcurrent and high-voltage protection circuit, the third end of the common mode filter is connected with the first end of the reverse connection prevention protection module, the fourth end of the common mode filter is connected with the second end of the reverse connection prevention protection module, and the common mode filter is used for filtering common mode signals generated by the reverse connection prevention protection module and the differential mode filtering module.

4. The power protection circuit of claim 1, wherein the over-current and over-voltage protection module comprises:

a first end of the self-recovery fuse is used as a first end of the overcurrent and overvoltage protection module;

a first end of the first diode is connected with a second end of the self-recovery fuse, and a second end of the first diode is used as a second end of the overcurrent and overvoltage protection module;

the first end of the first capacitor is connected with the second end of the self-recovery fuse, the second end of the first capacitor is connected with the second end of the first diode, the first end of the first capacitor is used as the third end of the overcurrent and overvoltage protection module, and the second end of the first capacitor is used as the fourth end of the overcurrent and overvoltage protection module.

5. The power protection circuit according to claim 2, wherein the reverse-connection prevention protection module comprises:

the first end of the first resistor is used as the first end of the reverse connection prevention protection module and the third end of the reverse connection prevention protection module;

a first end of the second resistor is connected with a second end of the first resistor, and the second end of the second resistor is used as a fourth end of the reverse connection prevention protection module;

a first end of the second capacitor is connected with a second end of the first resistor, and a second end of the second capacitor is connected with a second end of the second resistor;

a first end of the second diode is connected with the second end of the first resistor, and a second end of the second diode is connected with the second end of the second resistor;

the grid electrode of the triode is connected with the second end of the first resistor, the drain electrode of the triode is used as the second end of the reverse connection prevention protection module, and the source electrode of the triode is connected with the second end of the second resistor.

6. The power protection circuit of claim 1, wherein the differential mode filtering module comprises:

a first end of the magnetic bead is used as a first end of the differential-mode filtering module, and a second end of the magnetic bead is used as a third end of the differential-mode filtering module;

a first end of the third capacitor is connected with the first end of the magnetic bead, and a second end of the third capacitor is used as a second end of the differential-mode filtering module and a fourth end of the differential-mode filtering circuit;

and a first end of the fourth capacitor is connected with the second end of the magnetic bead, and a second end of the fourth capacitor is connected with the second end of the third capacitor.

7. The power protection circuit of claim 4, wherein the first diode is a transient voltage suppression diode.

8. The power protection circuit of claim 5, wherein the second diode is a zener diode and the transistor is an N-type mosfet.

9. A power supply protection device, comprising: the power protection circuit of any one of claims 1-8.

10. A vehicle characterized by comprising the power supply protection device according to claim 9.

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