Protection circuit, power supply device and vehicle

Abstract

The utility model provides a protection circuit, a power supply device and a vehicle. The protection circuit comprises a first input end, a second input end, a first output end, a second output end, a switch module, a voltage division module, a voltage stabilization module and an energy storage module. The first input end is connected with the first end of the switch module, the second end of the switch module is connected with the first end of the voltage stabilizing module, the first end of the voltage dividing module and the first output end, and the third end of the switch module is connected with the second end of the voltage stabilizing module, the second end of the voltage dividing module and the first end of the energy storage module. The second end of the energy storage module is connected with the third end of the voltage dividing module, the second output end and the second input end. And when the power supply is reversely connected with the protection circuit, namely the positive electrode of the power supply is connected with the second input end and the negative electrode of the power supply is connected with the first input end, the switch module is switched off, so that the connection between the first input end and the first output end is cut off, and reverse connection prevention protection is realized.

Description

Technical Field

[0001] This application relates to the field of circuit technology, specifically to a protection circuit, a power supply device, and a vehicle. Background Technology

[0002] With the development of automotive electronics, the level of intelligence and entertainment in vehicle equipment is getting higher and higher, and there are more and more electronic devices in vehicles (such as smart cockpits, electronic rearview mirrors, head-up displays, etc.), which puts higher and higher demands on power supply capabilities.

[0003] However, currently, the power supply devices for in-vehicle electronic devices do not have reverse connection protection. When the power is reversed, the circuit will still work, which may damage the equipment or even cause a fire. Utility Model Content

[0004] This application provides a protection circuit, power supply device, and vehicle that can provide protection when the power supply is reversed.

[0005] In a first aspect, embodiments of this application provide a protection circuit applied to a power supply device, the power supply device including a power supply, and the protection circuit including: a first input terminal, a second input terminal, a first output terminal, a second output terminal, a switching module, a voltage divider module, a voltage regulator module, and an energy storage module. The first input terminal is connected to a first terminal of the switching module; the second terminal of the switching module is connected to the first terminal of the voltage regulator module, the first terminal of the voltage divider module, and the first output terminal, respectively; the third terminal of the switching module is connected to the second terminal of the voltage regulator module, the second terminal of the voltage divider module, and the first terminal of the energy storage module, respectively; the second terminal of the energy storage module is connected to the third terminal of the voltage divider module, the second output terminal, and the second input terminal, respectively; wherein, the switching module is configured to conduct when the first input terminal is connected to the positive terminal of the power supply and the second input terminal is connected to the negative terminal of the power supply, thereby establishing a connection between the first input terminal and the second output terminal, and for connecting the positive terminal of the power supply to the second input terminal. The switching module is configured to divide the power supply voltage when the switching module is connected to the power supply and the switching module is turned on; the energy storage module is configured to charge based on the power supply when the switching module is connected to the power supply and the switching module is turned on, and to discharge when the connection between the power supply and the switching module is disconnected or when the power supply is de-energized, so as to control the switching speed of the switching module; the voltage regulator module is configured to keep the voltage between the first terminal and the second terminal of the voltage regulator module at a preset voltage value when the switching module is turned on.

[0006] In one or more embodiments, the switching module includes a PMOS transistor; the drain of the PMOS transistor is connected to the first input terminal, the source of the PMOS transistor is connected to the first terminal of the voltage regulator module, the first terminal of the voltage divider module and the first output terminal respectively, and the gate of the PMOS transistor is connected to the second terminal of the voltage regulator module, the second terminal of the voltage divider module and the first terminal of the energy storage module respectively.

[0007] In one or more embodiments, the voltage divider module includes a first resistor and a second resistor; a first end of the first resistor is connected to a second end of the switching module, a first end of the voltage regulator module, and a first output end, respectively; a second end of the first resistor is connected to a third end of the switching module, a second end of the voltage regulator module, a first end of the energy storage module, and a first end of the second resistor, respectively; and a second end of the second resistor is connected to a second end of the energy storage module, a second input end, and a second output end, respectively.

[0008] In one or more embodiments, the voltage regulator module includes a Zener diode; the cathode of the Zener diode is connected to the second terminal of the switching module, the first terminal of the voltage divider module, and the first output terminal, respectively, and the anode of the Zener diode is connected to the third terminal of the switching module, the second terminal of the voltage divider module, and the first terminal of the energy storage module, respectively.

[0009] In one or more embodiments, the energy storage module includes a first capacitor; a first terminal of the first capacitor is connected to a third terminal of the switching module, a second terminal of the voltage regulator module, and a second terminal of the voltage divider module, respectively; and a second terminal of the first capacitor is connected to a third terminal of the voltage divider module, a second output terminal, and a second input terminal, respectively.

[0010] Secondly, embodiments of this application also provide a power supply device, which includes: a power supply and a protection circuit as described in any embodiment of the first aspect; the power supply is connected to the protection circuit.

[0011] Thirdly, embodiments of this application also provide a vehicle, the vehicle including: an on-board electronic device, and a power supply device as described in the second aspect; the on-board electronic device is connected to the protection circuit in the power supply device.

[0012] In one or more embodiments, the vehicle-mounted electronic device includes a capacitive module; a first end of the capacitive module is connected to a first output end in the protection circuit, and a second end of the capacitive module is connected to a second output end in the protection circuit.

[0013] In one or more embodiments, the capacitive module includes a second capacitor; a first terminal of the second capacitor is connected to the first output terminal, and a second terminal of the second capacitor is connected to the second output terminal.

[0014] The beneficial effects of this application embodiment are as follows: This application embodiment provides a protection circuit, a power supply device, and a vehicle. The protection circuit includes: a first input terminal, a second input terminal, a first output terminal, a second output terminal, a switching module, a voltage divider module, a voltage regulator module, and an energy storage module. The first input terminal is connected to the first terminal of the switching module. The second terminal of the switching module is connected to the first terminal of the voltage regulator module, the first terminal of the voltage divider module, and the first output terminal, respectively. The third terminal of the switching module is connected to the second terminal of the voltage regulator module, the second terminal of the voltage divider module, and the first terminal of the energy storage module, respectively. The second terminal of the energy storage module is connected to the third terminal of the voltage divider module, the second output terminal, and the second input terminal, respectively. When the power supply and the protection circuit are reverse-connected, that is, when the positive terminal of the power supply is connected to the second input terminal and the negative terminal of the power supply is connected to the first input terminal, the switching module is turned off, thereby disconnecting the connection between the first input terminal and the first output terminal, realizing reverse connection protection. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 A structural block diagram of a protection circuit provided in an embodiment of this application;

[0017] Figure 2 A structural diagram of a protection circuit provided in an embodiment of this application;

[0018] Figure 3 A structural diagram of another protection circuit provided in an embodiment of this application;

[0019] Figure 4 This is a waveform diagram provided for an embodiment of this application. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "electrically connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items. Furthermore, technical features involved in the different embodiments of this invention described below may be combined with each other as long as they do not conflict with each other.

[0022] In a first aspect, embodiments of this application provide a protection circuit applied to a power supply device, the power supply device including a power supply, see reference. Figure 1 The protection circuit 100 includes: a first input terminal IN+, a second input terminal IN-, a first output terminal OUT+, a second output terminal OUT-, a switching module 10, a voltage divider module 20, a voltage regulator module 30, and an energy storage module 40.

[0023] The first input terminal IN+ is connected to the first terminal of the switching module 10. The second terminal of the switching module 10 is connected to the first terminal of the voltage regulator module 30, the first terminal of the voltage divider module 20, and the first output terminal OUT+. The third terminal of the switching module 10 is connected to the second terminal of the voltage regulator module 30, the second terminal of the voltage divider module 20, and the first terminal of the energy storage module 40. The second terminal of the energy storage module 40 is connected to the third terminal of the voltage divider module 20, the second output terminal OUT-, and the second input terminal IN-. It should be noted that the absence of a black dot between the two intersecting lines in the accompanying drawings indicates that the two lines are not actually connected.

[0024] The switching module 10 is configured to be turned on when the first input terminal IN+ is connected to the positive terminal of the power supply 200 and the second input terminal IN- is connected to the negative terminal of the power supply 200, thereby establishing a connection between the first input terminal IN+ and the second output terminal OUT-; and to be turned off when the second input terminal IN- is connected to the positive terminal of the power supply 200 and the first input terminal IN+ is connected to the negative terminal of the power supply 200, thereby disconnecting the connection between the first input terminal IN+ and the second output terminal OUT-. The voltage divider module 20 is configured to divide the voltage of the power supply 200 when the switching module 10 is connected to the power supply 200 and the switching module 10 is turned on. The energy storage module 40 is configured to charge the power supply 200 when the switching module 10 is connected to the power supply 200 and the switching module 10 is turned on, and to discharge the power supply 200 when the connection between the power supply 200 and the switching module 10 is disconnected or when the power supply 200 is de-energized, thereby controlling the switching speed of the switching module 10. The voltage regulator module 30 is configured to maintain a preset voltage value between the first terminal and the second terminal of the voltage regulator module 30 when the switching module 10 is turned on.

[0025] See Figure 2 The power supply 200 is a DC power supply, such as a pluggable battery. The voltage of the power supply 200 can be set according to the power supply requirements of the actual vehicle electronic equipment 300, such as 12V. The battery may include multiple cells connected in parallel, series, or mixed connection for storing and providing electrical energy; mixed connection includes series and parallel connection. To simulate the reverse connection of the power supply 200 and the protection circuit 100, in... Figure 2 and Figure 3 In the embodiment shown, a double-pole double-throw switch SW1 can be configured to control the power supply and protection circuit 100 to be connected in either the positive or negative direction. The specific structure and control method can refer to the prior art and are not limited here.

[0026] The first output terminal OUT+ can be connected to the positive terminal of the vehicle-mounted electronic device 300 or other loads, and the second output terminal OUT- can be connected to the negative terminal of the vehicle-mounted electronic device 300 or other loads. The vehicle-mounted electronic device 300 refers to a device used to receive and consume electrical energy. In this protection circuit 100, see [reference needed]. Figure 3 When the power supply 200 and the protection circuit 100 are reverse-connected, i.e., when the positive terminal of the power supply 200 is connected to the second input terminal IN- and the negative terminal of the power supply 200 is connected to the first input terminal IN+, the switch module 10 is turned off, thereby disconnecting the connection between the power supply 200 and the vehicle electronic device 300, thus achieving reverse connection protection. When the power supply 200 and the protection circuit 100 are connected in the correct direction, refer to... Figure 2When the positive terminal of the power supply 200 is connected to the first input terminal IN+ and the negative terminal of the power supply 200 is connected to the second input terminal IN-, the switching module 10 is turned on, thereby establishing a connection between the power supply 200 and the vehicle electronic device 300, and the energy storage module 40 begins to charge. The voltage divider module 20 can divide the power supply voltage through voltage distribution between resistors (or other voltage divider components). The voltage regulator module 30 maintains the voltage between the third terminal and the second terminal of the switching module 10 at a stable voltage. Under the action of the voltage divider module 20 and the voltage regulator module 30, the switching module 10 can remain on. Then, when the connection between the power supply 200 and the switching module 10 is disconnected (such as a power failure or switching of the power supply 200) or when the power supply 200 is de-energized, the energy storage module 40 will release its stored electrical energy to discharge. At this time, the electrical energy released by the energy storage module 40 can keep the switching module 10 on for a period of time, thereby controlling the turn-off speed of the switching module 10.

[0027] As can be seen, the protection circuit 100 provided in this application embodiment can achieve reverse connection protection, improving the safety and reliability of the circuit during operation.

[0028] In some of these embodiments, see Figure 2 The switching module 10 includes a PMOS transistor Q1. The drain of the PMOS transistor Q1 is connected to the first input terminal IN+, the source of the PMOS transistor Q1 is connected to the first terminal of the voltage regulator module 30, the first terminal of the voltage divider module 20 and the first output terminal OUT+, respectively, and the gate of the PMOS transistor Q1 is connected to the second terminal of the voltage regulator module 30, the second terminal of the voltage divider module 20 and the first terminal of the energy storage module 40, respectively.

[0029] The PMOS transistor Q1 has a parasitic diode. When the power supply 200 and the protection circuit 100 are reversed, that is, when the positive terminal of the power supply 200 is connected to the second input terminal IN- and the negative terminal of the power supply 200 is connected to the first input terminal IN+, refer to [reference needed]. Figure 3 When the parasitic diode of PMOS transistor Q1 is in reverse voltage mode, the drain and source of PMOS transistor Q1 are in a high-resistance state, and PMOS transistor Q1 is in the off state, thereby disconnecting the power supply 200 from the vehicle electronic equipment 300 and achieving reverse connection protection. When the power supply 200 and the protection circuit 100 are connected in the correct direction, refer to... Figure 2When the positive terminal of the power supply 200 is connected to the first input terminal IN+ and the negative terminal of the power supply 200 is connected to the second input terminal IN-, the power supply 200 first forms a path with the subsequent circuit through the parasitic diode of the PMOS transistor Q1, that is, the connection between the power supply 200 and the vehicle electronic device 300 is established. At this time, the energy storage module 40 starts charging, the voltage divider module 20 divides the voltage of the power supply 200, and the voltage regulator module 30 maintains the voltage between the gate and source of the PMOS transistor Q1 at a stable voltage. Under the action of the voltage divider module 20 and the voltage regulator module 30, the PMOS transistor Q1 is forward-biased.

[0030] Because PMOS transistor Q1 has excellent forward voltage drop characteristics, through device selection, when the voltage between the gate and source of PMOS transistor Q1 is -5V, the resistance between the drain and source of PMOS transistor Q1 is as low as about 20mΩ when PMOS transistor Q1 is turned on, and the voltage of the first output terminal OUT+ is about equal to the voltage of the power supply 200, which can improve energy transfer efficiency. Moreover, if the connection between the power supply 200 and the switching module 10 is disconnected or the power supply 200 is turned off after PMOS transistor Q1 is turned on, the energy storage module 40 will start to discharge, so that the gate voltage of PMOS transistor Q1 will not drop rapidly, that is, PMOS transistor Q1 will turn off after a certain delay.

[0031] In some of these embodiments, see Figure 2 The voltage divider module 20 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected to the second end of the switch module 10, the first end of the voltage regulator module 30, and the first output terminal OUT+, respectively. The second end of the first resistor R1 is connected to the third end of the switch module 10, the second end of the voltage regulator module 30, the first end of the energy storage module 40, and the first end of the second resistor R2, respectively. The second end of the second resistor R2 is connected to the second end of the energy storage module 40, the second input terminal IN-, and the second output terminal OUT-, respectively.

[0032] In this embodiment, the voltage of the power supply 200 can be divided by setting two resistors. The number and value of the resistors included in the voltage divider module 20 can be determined according to actual needs and are not limited here.

[0033] In some of these embodiments, see Figure 2 The voltage regulator module 30 includes a Zener diode D1. The cathode of the Zener diode D1 is connected to the second terminal of the switch module 10, the first terminal of the voltage divider module 20, and the first output terminal OUT+, respectively. The anode of the Zener diode D1 is connected to the third terminal of the switch module 10, the second terminal of the voltage divider module 20, and the first terminal of the energy storage module 40, respectively.

[0034] Specifically, the cathode of Zener diode D1 is connected to the source of PMOS transistor Q1, the first terminal of the first resistor R1, and the first output terminal OUT+, respectively. The anode of Zener diode D1 is connected to the gate of PMOS transistor Q1, the second terminal of the first resistor R1, the first terminal of the second resistor R2, and the first terminal of energy storage module 40, respectively.

[0035] After the switching module 10 is turned on, the Zener diode D1 can maintain the voltage between the cathode and anode of the Zener diode D1 at a preset voltage, such as 5.1V, thereby protecting the gate of the PMOS transistor Q1 from damage and improving the reliability of the circuit operation.

[0036] In some of these embodiments, see Figure 2 The energy storage module 40 includes a first capacitor C1. The first terminal of the first capacitor C1 is connected to the third terminal of the switching module 10, the second terminal of the voltage regulator module 30, and the second terminal of the voltage divider module 20. The second terminal of the first capacitor C1 is connected to the third terminal of the voltage divider module 20, the second output terminal OUT-, and the second input terminal IN-. In this embodiment, by setting the first capacitor C1, electrical energy can be stored and released.

[0037] Secondly, embodiments of this application also provide a power supply device, which includes: a power supply 200, and a protection circuit 100 as described in any embodiment of the first aspect; the power supply 200 is connected to the protection circuit.

[0038] In this embodiment, the protection circuit has the same structure and function as the protection circuit described in any embodiment of the first aspect, and will not be repeated here.

[0039] Thirdly, embodiments of this application also provide a vehicle, which includes: an on-board electronic device 300, and a power supply device as described in the second aspect. The on-board electronic device 300 is connected to a protection circuit in the power supply device.

[0040] In this embodiment, the power supply device has the same structure and function as the power supply device described in any embodiment of the first aspect, and will not be repeated here.

[0041] The in-vehicle electronic equipment 300 can be a smart cockpit, electronic rearview mirror, head-up display, or other in-vehicle devices that consume electrical energy.

[0042] In some of these embodiments, see Figure 2 The vehicle-mounted electronic device 300 includes a capacitive module 310. The first terminal of the capacitive module 310 is connected to the first output terminal OUT+ in the protection circuit, and the second terminal of the capacitive module 310 is connected to the second output terminal OUT- in the protection circuit.

[0043] A capacitive module 310 typically refers to an electronic component or assembly with capacitive properties, which may contain one or more capacitors. A capacitor is a component that can store electrical charge. When a voltage is applied across a capacitor, charge accumulates on its plates, thereby storing electrical energy. When the voltage across the capacitor changes, the capacitor releases or absorbs charge to maintain a stable voltage across its terminals.

[0044] Specifically, in some embodiments, see [reference] Figure 2 The capacitive module includes a second capacitor C2. The first terminal of the second capacitor C2 is connected to the first output terminal OUT+, and the second terminal of the second capacitor C2 is connected to the second output terminal OUT-.

[0045] In some embodiments, the in-vehicle electronic device 300 includes a resistive module, such as... Figure 2 As shown, the resistive module includes a resistor Rf, with the first end of the resistor Rf connected to the first output terminal OUT+ and the second end of the resistor Rf connected to the second output terminal OUT-.

[0046] The following is based on Figure 2 The illustrated embodiment details the operation of the protection circuit provided in this application. In this circuit, when the power supply 200 and the protection circuit 100 are reverse-connected, i.e., when the positive terminal of the power supply 200 is connected to the second input terminal IN- and the negative terminal of the power supply 200 is connected to the first input terminal IN+, refer to... Figure 3 When the parasitic diode of PMOS transistor Q1 is in reverse voltage state, the drain and source of PMOS transistor Q1 are in high resistance state, and PMOS transistor Q1 is in the off state, thereby disconnecting the connection between the power supply 200 and the vehicle electronic equipment 300 and realizing reverse connection protection.

[0047] When the power supply 200 and the protection circuit 100 are connected in the correct direction, refer to Figure 2 When the positive terminal of power supply 200 is connected to the first input terminal IN+ and the negative terminal of power supply 200 is connected to the second input terminal IN-, firstly, power supply 200 forms a path with the subsequent circuit through the parasitic diode of PMOS transistor Q1, that is, the connection between power supply 200 and vehicle electronic device 300 is established. At this time, the first capacitor C1 begins to charge, the first resistor R1 and the second resistor R2 divide the voltage of power supply 200, and the Zener diode D1 maintains the voltage between the gate and source of PMOS transistor Q1 at a stable voltage, so PMOS transistor Q1 is forward-biased. After PMOS transistor Q1 is turned on, the connection between power supply 200 and switching module 10 is disconnected or power supply 200 is de-energized. (See reference...) Figure 4 At time t1, the double-pole double-throw switch SW1 is activated by... Figure 2 The status shown has switched to Figure 3As shown, at the instant of switching, the voltage between the gate and source of PMOS transistor Q1 is still less than the turn-on threshold, so PMOS transistor Q1 remains in the on state and discharges in reverse to ground. Due to the presence of the second capacitor C2, the gate voltage of PMOS transistor Q1 will not drop rapidly. As the voltage at the first output terminal OUT+ gradually decreases, the voltage between the gate and source of PMOS transistor Q1 will exceed the turn-on threshold, and PMOS transistor Q1 will turn off. That is, PMOS transistor Q1 will turn off after a certain delay. The second capacitor C2 discharges through the vehicle electronic device 300. If the discharge is through the resistive module (resistor Rf) in the vehicle electronic device 300, the operation of the vehicle electronic device 300 can be guaranteed. Figure 4 During the time intervals t1 to t2, the voltage at the first output terminal VOUT+ is greater than 9V. If, subsequently at time t2, the positive terminal of power supply 200 is reconnected to the first input terminal IN+ and the negative terminal of power supply 200 is reconnected to the second input terminal IN-, then at time t2, the double-pole double-throw switch SW1 will... Figure 3 The status shown has switched to Figure 2 As shown, the circuit can return to normal operation. Specifically, in... Figure 4 In the diagram, line S1 represents the voltage change curve of the first input terminal IN+ over time, and line S2 represents the voltage change curve of the first output terminal OUT+ over time.

[0048] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above, which are not provided in detail for the sake of brevity; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A protection circuit applied to a power supply device, the power supply device comprising a power supply, characterized in that, The protection circuit comprises a first input end, a second input end, a first output end, a second output end, a switching module, a voltage dividing module, a voltage stabilizing module and an energy storage module; The first input end is connected with a first end of the switching module, a second end of the switching module is connected with a first end of the voltage stabilizing module, a first end of the voltage dividing module and the first output end respectively, a third end of the switching module is connected with a second end of the voltage stabilizing module, a second end of the voltage dividing module and a first end of the energy storage module respectively, a second end of the energy storage module is connected with a third end of the voltage dividing module, the second output end and the second input end respectively; The switching module is configured to be turned on when the first input end is connected with a positive pole of a power supply and the second input end is connected with a negative pole of the power supply, so as to establish a connection between the first input end and the second output end, and the switching module is configured to be turned off when the second input end is connected with the positive pole of the power supply and the first input end is connected with the negative pole of the power supply, so as to disconnect the connection between the first input end and the second output end; The voltage dividing module is configured to divide the voltage of the power supply when the switching module is connected with the power supply and the switching module is turned on; The energy storage module is configured to be charged based on the power supply when the switching module is connected with the power supply and the switching module is turned on, and to be discharged when the connection between the power supply and the switching module is disconnected or the power supply is powered off, so as to control the switching speed of the switching module; The voltage stabilizing module is configured to make the voltage between the first end of the voltage stabilizing module and the second end of the voltage stabilizing module be a preset voltage value when the switching module is turned on.

2. The protection circuit of claim 1, wherein, The switching module comprises a PMOS tube; The drain of the PMOS tube is connected with the first input end, the source of the PMOS tube is connected with the first end of the voltage stabilizing module, the first end of the voltage dividing module and the first output end respectively, and the gate of the PMOS tube is connected with the second end of the voltage stabilizing module, the second end of the voltage dividing module and the first end of the energy storage module respectively.

3. The protection circuit of claim 1, wherein, The voltage dividing module comprises a first resistor and a second resistor; The first end of the first resistor is connected with the second end of the switching module, the first end of the voltage stabilizing module and the first output end respectively, the second end of the first resistor is connected with the third end of the switching module, the second end of the voltage stabilizing module, the first end of the energy storage module and the first end of the second resistor respectively, and the second end of the second resistor is connected with the second end of the energy storage module, the second input end and the second output end respectively.

4. The protection circuit of claim 1, wherein The voltage stabilizing module comprises a voltage stabilizing diode; The cathode of the voltage stabilizing diode is connected with the second end of the switching module, the first end of the voltage dividing module and the first output end respectively, and the anode of the voltage stabilizing diode is connected with the third end of the switching module, the second end of the voltage dividing module and the first end of the energy storage module respectively.

5. The protection circuit according to any one of claims 1 to 4, characterized in that, The energy storage module comprises a first capacitor; The first end of the first capacitor is connected with the third end of the switch module, the second end of the voltage stabilizing module and the second end of the voltage dividing module respectively, and the second end of the first capacitor is connected with the third end of the voltage dividing module, the second output end and the second input end respectively.

6. A power supply device, characterized by comprising: The application relates to a power supply device and a vehicle-mounted electronic device. The application relates to a power supply device and a vehicle-mounted electronic device. The application relates to a power supply device and a vehicle-mounted electronic device.

7. A vehicle characterized by comprising: The application relates to a power supply device and a vehicle-mounted electronic device. The application relates to a power supply device and a vehicle-mounted electronic device. The application relates to a power supply device and a vehicle-mounted electronic device.

8. The vehicle of claim 7, wherein, The application relates to a power supply device and a vehicle-mounted electronic device. The application relates to a power supply device and a vehicle-mounted electronic device.

9. The vehicle of claim 8, wherein, The application relates to a power supply device and a vehicle-mounted electronic device. The application relates to a power supply device and a vehicle-mounted electronic device.

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