Power supply circuit and electronic equipment

Abstract

The utility model belongs to the technical field of power supply circuits, and particularly relates to a power circuit and electronic equipment. The power supply circuit comprises a power supply port, a high-voltage protection module, an output switch module and a voltage detection module, and the power supply port is used for accessing power supply voltage; the input end of the output switch module is connected with the power supply port through the high-voltage protection module; the voltage detection module is connected with the input end of the output switch module. Through the output switch module and the voltage detection module, the output switch module can be disconnected when the power supply voltage provided by the power supply is greater than the preset voltage threshold value, and the connection between the power supply port and the input end of the output switch module can be disconnected through the high-voltage protection module. And damage to the output switch module and the voltage detection module caused by continuous application of high voltage to the output switch module and the voltage detection module is avoided.

Description

Technical Field

[0001] This application belongs to the field of power supply circuit technology, and particularly relates to power supply circuits and electronic equipment. Background Technology

[0002] Currently, there are many types of adapters that can be connected to DC power sockets on the market. While the interfaces of various power adapters are standardized, the voltage specifications vary greatly, ranging from low voltage ranges such as 5V, 9V, and 12V to high voltage ranges such as 24V, 48V, and 53.5V. This means that if a device that only supports low voltage power supply is accidentally plugged into a high voltage power supply, it will be damaged. Utility Model Content

[0003] The purpose of this application is to provide a power supply circuit and electronic device that aims to solve the problem of traditional low-voltage power supplies being damaged by high-voltage power supplies.

[0004] A first aspect of this application provides a power supply circuit, including: a power port, a high-voltage protection module, an output switch module, and a voltage detection module. The power port is used to connect to a power supply voltage. The input terminal of the output switch module is connected to the power port through the high-voltage protection module. The voltage detection module is connected to the input terminal of the output switch module and is used to control the output switch module to conduct to output a supply voltage at the output terminal based on the power supply voltage when the power supply voltage is less than a preset voltage threshold, and to control the output switch module to turn off when the power supply voltage is greater than the preset voltage threshold. The high-voltage protection module is also connected to the output terminal of the output switch module and is used to disconnect the connection between the input terminal of the output switch module and the power port when the power is on and there is no output at the output terminal of the output switch module.

[0005] In one embodiment, the voltage detection module includes a first resistor, a second resistor, a first Zener diode, and a first switching device. A first terminal of the first resistor is connected to the input terminal of the output switching module. A second terminal of the first resistor is connected to both the first terminal of the second resistor and the negative terminal of the first Zener diode. The positive terminal of the first Zener diode is grounded. A second terminal of the second resistor is connected to the control terminal of the first switching device. A first terminal of the first switching device is connected to the input terminal of the output switching module. A second terminal of the first switching device is connected to the control terminal of the output switching module. The first switching device is configured to conduct when the Zener diode is broken down, thereby controlling the output switching module to turn off.

[0006] In one embodiment, the output switch module includes a third resistor, a fourth resistor, a first capacitor, a second capacitor, and a second switch device; the first terminal of the second switch device is connected to the high-voltage protection module, the second terminal of the second switch device is used to output the power supply voltage, and the control terminal of the second switch device is connected to the voltage detection module; the third resistor is connected between the first terminal of the second switch device and the control terminal of the second switch device, the first capacitor is connected between the first terminal of the second switch device and the control terminal of the second switch device, the first terminal of the fourth resistor is connected to the control terminal of the second switch device, the second terminal of the fourth resistor is grounded, the first terminal of the second capacitor is connected to the second terminal of the second switch device, and the second terminal of the second capacitor is grounded.

[0007] In one embodiment, the power supply circuit further includes a first conversion circuit for generating and outputting a rated voltage based on a first power supply voltage, wherein the first power supply voltage is less than a preset voltage threshold; and a second conversion circuit for generating and outputting a rated voltage based on a second power supply voltage, wherein the second power supply voltage is greater than a preset voltage threshold; the high-voltage protection module is also connected to the output terminal of the second conversion circuit to power on based on the rated voltage, and the high-voltage protection module is configured to disconnect the connection between the input terminal of the output switch module and the power port when the second conversion circuit outputs the rated voltage and the output terminal of the output switch module has no output.

[0008] In one embodiment, the high-voltage protection module includes a detection unit and a switching unit; the switching unit is connected between the input terminal of the output switching module and the power supply, and the detection unit is connected to the output terminal of the output switching module, the output terminal of the second conversion circuit, and the control terminal of the switching unit respectively. The detection unit is used to control the switching unit to turn off the connection between the input terminal of the output switching module and the power supply port when the second conversion circuit outputs the rated voltage and the output terminal of the output switching module has no output.

[0009] In one embodiment, the detection unit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third switching device, and a fourth switching device. The control terminal of the third switching device is connected to the output terminal of the output switching module through the fifth resistor and grounded through the sixth resistor. The first terminal of the third switching device is connected to the control terminal of the fourth switching device, and the third switching device is grounded. The control terminal of the fourth switching device is connected to the output terminal of the second conversion circuit through the seventh resistor and grounded through the eighth resistor. The first terminal of the fourth switching device is connected to the control terminal of the switching unit, and the second terminal of the fourth switching device is grounded. The third switching device is configured to turn off when the output switching module does not output the supply voltage, and the fourth switching device is configured to turn on when the second conversion circuit outputs the rated voltage and the third switching device is turned off.

[0010] In one embodiment, the switching unit includes a third capacitor, a ninth resistor, a second Zener diode, and a relay; the third capacitor is connected between the output terminal of the second conversion circuit and the detection unit; the cathode of the second Zener diode is connected to the output terminal of the second conversion circuit, the anode of the second Zener diode is connected to the detection unit; the coil of the relay is connected between the output terminal of the second conversion circuit and the detection unit; the common terminal of the relay is used to connect to the power supply; the normally closed contact of the relay is connected to the input terminal of the output switching module; and the normally open contact of the relay is grounded through the ninth resistor.

[0011] In one embodiment, the power supply circuit further includes an input filter module, the first terminal of which is connected to the input terminal of the high voltage protection module, and the second terminal of which is grounded.

[0012] In one embodiment, the power supply circuit further includes a transient voltage suppression diode, the positive terminal of which is grounded, and the negative terminal of which is connected to the input terminal of the high voltage protection module.

[0013] A second aspect of this application provides an electronic device including the power supply circuit described above.

[0014] The beneficial effects of this application embodiment compared with the prior art are: the output switch module and the voltage detection module can disconnect the output switch module when the power supply voltage provided by the power supply is greater than the preset voltage threshold, and the high voltage protection module can disconnect the connection between the power supply port and the input terminal of the output switch module, so as to avoid the continuous application of high voltage to the output switch module and the voltage detection module, which would cause damage to the output switch module and the voltage detection module. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the power supply circuit provided in an embodiment of this application;

[0016] Figure 2 A circuit diagram of an output switch module and a voltage detection module provided in an embodiment of this application;

[0017] Figure 3 This is another schematic diagram of the power supply circuit provided in one embodiment of this application;

[0018] Figure 4 A circuit diagram of a high-voltage protection module provided in an embodiment of this application;

[0019] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] Figure 1A schematic diagram of a power supply circuit according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0025] A power supply circuit 10 includes: a power port VIN, a high-voltage protection module 100, an output switch module 200, and a voltage detection module 300. The power port VIN can be connected to an external power source for receiving power voltage.

[0026] The input terminal of the output switch module 200 is connected to the power port VIN via the high-voltage protection module 100; the voltage detection module 300 is connected to the input terminal of the output switch module 200 and is used to control the output switch module 200 to conduct and output the supply voltage VOUT at the output terminal based on the power supply voltage when the power supply voltage is less than a preset voltage threshold, and to control the output switch module 200 to turn off when the power supply voltage is greater than the preset voltage threshold; the high-voltage protection module 100 is also connected to the output terminal of the output switch module 200 and is used to disconnect the connection between the input terminal of the output switch module 200 and the power port VIN when the high-voltage protection module 100 is powered on and the output terminal of the output switch module 200 has no output.

[0027] The output switch module 200 and voltage detection module 300 can disconnect the connection between the power port VIN and the first conversion circuit 400 when the first power supply voltage provided by the power port VIN is greater than a preset voltage threshold. Furthermore, the high voltage protection module 100 can disconnect the connection between the power port VIN and the input terminal of the output switch module 200, thereby preventing high voltage from being continuously applied to the output switch module 200 and voltage detection module 300, which could damage them.

[0028] The preset voltage threshold can be set according to actual needs.

[0029] In one embodiment, such as Figure 2 As shown, the voltage detection module 300 includes a first resistor R1, a second resistor R2, a first Zener diode D1, and a first switching device Q1.

[0030] The first end of the first resistor R1 is connected to the input terminal of the output switch module 200. The second end of the first resistor R1 is connected to the first end of the second resistor R2 and the negative terminal of the first Zener diode D1. The positive terminal of the first Zener diode D1 is grounded. The second end of the second resistor R2 is connected to the control terminal of the first switching device Q1. The first end of the first switching device Q1 is connected to the input terminal of the output switch module 200. The second end of the first switching device Q1 is connected to the control terminal of the output switch module 200. The first switching device Q1 is configured to conduct when the Zener diode is broken down, so as to control the output switch module 200 to turn off.

[0031] It is understood that the preset voltage threshold corresponds to the breakdown voltage of the first Zener diode D1. When the power supply voltage provided by the power port VIN is less than the preset voltage threshold, the control terminal of the first switching device Q1 is at a high level. When the power supply voltage is greater than the preset voltage threshold, the first Zener diode D1 breaks down, and the control terminal of the first switching device Q1 is at a low level. The first switching device Q1 can be configured to be turned off when the control terminal is at a high level and turned on when it is at a low level. By controlling the on and off states of the first switching device Q1, the output switching module 200 can be controlled.

[0032] Specifically, the first switching device Q1 may include a PNP transistor.

[0033] In one embodiment, such as Figure 2 As shown, the output switch module 200 includes a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, and a second switch device Q2.

[0034] The first terminal of the second switching device Q2 is connected to the high-voltage protection module 100, the second terminal of the second switching device Q2 is used to output the power supply voltage VOUT, the second terminal of the second switching device Q2 is connected to the input terminal of the first conversion circuit 400, and the control terminal of the second switching device Q2 is connected to the voltage detection module 300; the third resistor R3 is connected between the first terminal of the second switching device Q2 and the control terminal of the second switching device Q2, the first capacitor C1 is connected between the first terminal of the second switching device Q2 and the control terminal of the second switching device Q2, the first terminal of the fourth resistor R4 is connected to the control terminal of the second switching device Q2, the second terminal of the fourth resistor R4 is grounded, the first terminal of the second capacitor C2 is connected to the second terminal of the second switching device Q2, and the second terminal of the second capacitor C2 is grounded.

[0035] It is understandable that when the first switching device Q1 is off, there is a voltage difference between the first terminal of the second switching device Q2 and the control terminal, which can cause the second switching device Q2 to conduct. When the first switching device Q1 is on, the voltage between the first terminal of the second switching device Q2 and the control terminal is equal, which can cause the second switching device Q2 to turn off. This enables the voltage detection module 300 to control the output switching module 200.

[0036] Specifically, the second switching device Q2 may include a PMOS transistor.

[0037] In one embodiment, the power supply voltage includes a first power supply voltage and a second power supply voltage. For example... Figure 3 As shown, the power supply circuit 10 also includes a first conversion circuit 400 and a second conversion circuit 500. The first conversion circuit is used to generate and output a rated voltage VDD based on a first power supply voltage, where the first power supply voltage is less than a preset voltage threshold.

[0038] The second conversion circuit 500 is used to generate and output a rated voltage VDD based on a second power supply voltage, wherein the second power supply voltage is greater than a preset voltage threshold.

[0039] The high voltage protection module 100 is also connected to the output terminal of the second conversion circuit 500 to power on the high voltage protection module 100 based on the rated voltage. The high voltage protection module 100 is configured to disconnect the connection between the input terminal of the output switch module 200 and the power supply port VIN when the second conversion circuit 500 outputs the rated voltage VDD and the output terminal of the output switch module 200 has no output.

[0040] It is understandable that the first conversion circuit 400 and the second conversion circuit 500 are applied to low-voltage input and high-voltage input respectively, thereby realizing the wide voltage input of the power supply circuit 10.

[0041] In one embodiment, such as Figure 4 As shown, the high-voltage protection module 100 includes a detection unit 110 and a switching unit 120.

[0042] The switching unit 120 is connected between the input terminal of the output switching module 200 and the power port VIN. The detection unit 110 is connected to the output terminal of the output switching module 200, the output terminal of the second conversion circuit 500, and the control terminal of the switching unit 120. The detection unit 110 is used to control the switching unit 120 to turn off when the output switching module 200 is turned off and the second conversion circuit 500 outputs the rated voltage VDD.

[0043] Switching unit 120 can be configured as a normally open unit. It is understood that when output switching module 200 is off, its output is at a low level, and when output switching module 200 is off, its output is at a high level.

[0044] Correspondingly, when the output switch module 200 is turned on or the second conversion circuit 500 does not output the rated voltage VDD, the detection unit 110 controls the switch unit 120 to turn on.

[0045] In one embodiment, the detection unit 110 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third switching device Q3, and a fourth switching device Q4.

[0046] The control terminal of the third switching device Q3 is connected to the output terminal of the output switching module 200 through the fifth resistor R5 and grounded through the sixth resistor R6. The first terminal of the third switching device Q3 is connected to the control terminal of the fourth switching device Q4 and grounded. The control terminal of the fourth switching device Q4 is connected to the output terminal of the second conversion circuit 500 through the seventh resistor R7 and grounded through the eighth resistor R8. The first terminal of the fourth switching device Q4 is connected to the control terminal of the switching unit 120 and grounded through the second terminal of the fourth switching device Q4. The third switching device Q3 is configured to be turned off when the output switching module 200 does not output the supply voltage VOUT, and the fourth switching device Q4 is configured to be turned on when the second conversion circuit 500 outputs the rated voltage VDD and the third switching device Q3 is turned off.

[0047] It is understandable that by controlling the voltage at the control terminal of the third switching device Q3, the on / off state of Q3 can be controlled; similarly, by controlling the voltage at the control terminal of the fourth switching device Q4, the on / off state of Q4 can be controlled. The third switching device Q3 is used to detect the supply voltage VOUT, and the fourth switching device Q4 is used to detect the rated voltage VDD.

[0048] Correspondingly, the third switching device Q3 is also configured to be turned on when the output switching module 200 outputs the supply voltage VOUT.

[0049] In one embodiment, the switching unit 120 includes a third capacitor C3, a ninth resistor R9, a second Zener diode D2, and a relay S1.

[0050] The third capacitor C3 is connected between the output terminal of the second conversion circuit 500 and the detection unit 110. The negative terminal of the second Zener diode D2 is connected to the output terminal of the second conversion circuit 500, and the positive terminal of the second Zener diode D2 is connected to the detection unit 110. The coil of the relay S1 is connected between the output terminal of the second conversion circuit 500 and the detection unit 110. The common terminal of the relay S1 is used to connect to the power supply port VIN. The normally closed contact of the relay S1 is connected to the input terminal of the output switch module 200. The normally open contact of the relay S1 is grounded through the ninth resistor R9.

[0051] Understandably, before the coil of relay S1 is energized, the common terminal is connected to the normally closed contact. When the fourth switching device Q4 is turned on, the coil of relay S1 is energized, causing the common terminal to connect to the normally open contact. This achieves the effect of disconnecting the power supply port VIN from the output switch module 200 and the voltage detection module 300 when the power supply voltage exceeds a preset voltage threshold. This prevents high voltage from being continuously applied to the output switch module 200 and the voltage detection module 300, thus avoiding damage to them.

[0052] It's important to note that common power adapter protection circuits typically employ digital chips and other logic circuits to constantly monitor and assess the power supply voltage. This introduces additional power consumption and can lead to circuit overheating. If the monitoring and assessment of the power supply voltage ceases, the protection circuit may malfunction, potentially causing the power adapter itself to fail. Furthermore, when dealing with significant power supply voltage variations, common power adapter protection circuits are limited by the specifications and parameters of the components, making it difficult to balance cost and efficiency. For example, protection circuits using digital chips are constrained by the chip's performance. Improving the protection circuit's performance requires using digital chips with faster processing speeds, larger sampling ranges, and higher sampling accuracy, or more complex circuitry to assist lower-performance digital chips. This increases the design complexity of the protection circuit and negatively impacts its efficiency.

[0053] The relay S1 can effectively isolate voltage. Through the high voltage protection module 100, the output switch module 200 and the voltage detection module 300, logic self-locking can be achieved with high efficiency through hardware circuitry without the need for a control chip, that is, without introducing additional power consumption.

[0054] In one embodiment, the power supply circuit 10 further includes an input filter module 600, the first terminal of which is connected to the input terminal of the high voltage protection module 100, and the second terminal of which is grounded.

[0055] Specifically, the input filtering module 600 may include several capacitors. The input filtering module 600 can filter the power supply voltage and reduce power supply voltage fluctuations.

[0056] In one embodiment, the power supply circuit 10 further includes a transient voltage suppression diode VTS, with the positive terminal of the transient voltage suppression diode VTS grounded and the negative terminal of the transient voltage suppression diode VTS connected to the input terminal of the high voltage protection module 100.

[0057] The transient voltage suppressor diode VTS is used to prevent surge current from affecting the normal operation of the power supply circuit 10.

[0058] Figure 5 A schematic diagram of the structure of an electronic device according to an embodiment of this application is shown. For ease of explanation, only the parts related to this embodiment are shown, and are described in detail below:

[0059] An electronic device 20 includes a power supply circuit 10 as described in any of the above embodiments.

[0060] Since the electronic device 20 has all the technical features of the power supply circuit 10, the electronic device 20 also has the beneficial effects of the power supply circuit 10, which will not be described in detail in this embodiment.

[0061] Specifically, electronic device 20 may be a power adapter for connecting to power supply 30 and performing voltage conversion based on the power supply voltage provided by power supply 30.

[0062] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A power supply circuit, characterized by comprising: include: Power port, high voltage protection module, output switch module, and voltage detection module. The power port is used to connect to the power supply voltage; The input terminal of the output switch module is connected to the power port through the high voltage protection module; The voltage detection module is connected to the input terminal of the output switch module and is used to control the output switch module to turn on to output a supply voltage at the output terminal based on the power supply voltage when the power supply voltage is less than a preset voltage threshold, and to control the output switch module to turn off when the power supply voltage is greater than the preset voltage threshold. The high-voltage protection module is also connected to the output terminal of the output switch module. The high-voltage protection module is used to disconnect the connection between the input terminal of the output switch module and the power port when the power is on and the output terminal of the output switch module has no output.

2. The power supply circuit as described in claim 1, characterized in that, The voltage detection module includes a first resistor, a second resistor, a first Zener diode, and a first switching device; The first end of the first resistor is connected to the input terminal of the output switch module. The second end of the first resistor is connected to the first end of the second resistor and the negative terminal of the first Zener diode. The positive terminal of the first Zener diode is grounded. The second end of the second resistor is connected to the control terminal of the first switching device. The first end of the first switching device is connected to the input terminal of the output switch module. The second end of the first switching device is connected to the control terminal of the output switch module. The first switching device is configured to conduct when the Zener diode is broken down, so as to control the output switch module to turn off.

3. The power supply circuit as described in claim 1, characterized in that, The output switch module includes a third resistor, a fourth resistor, a first capacitor, a second capacitor, and a second switch device; The first terminal of the second switching device is connected to the high voltage protection module, the second terminal of the second switching device is used to output the power supply voltage, and the control terminal of the second switching device is connected to the voltage detection module. The third resistor is connected between the first terminal of the second switching device and the control terminal of the second switching device. The first capacitor is connected between the first terminal of the second switching device and the control terminal of the second switching device. The first terminal of the fourth resistor is connected to the control terminal of the second switching device, and the second terminal of the fourth resistor is grounded. The first terminal of the second capacitor is connected to the second terminal of the second switching device, and the second terminal of the second capacitor is grounded.

4. The power supply circuit according to any one of claims 1 to 3, characterized in that, The power supply circuit further includes a first conversion circuit, which is used to generate and output a rated voltage based on a first power supply voltage, wherein the first power supply voltage is less than a preset voltage threshold. A second conversion circuit is used to generate and output a rated voltage based on a second power supply voltage, wherein the second power supply voltage is greater than a preset voltage threshold. The high-voltage protection module is also connected to the output terminal of the second conversion circuit to power on based on the rated voltage. The high-voltage protection module is configured to disconnect the connection between the input terminal of the output switch module and the power port when the second conversion circuit outputs the rated voltage and the output terminal of the output switch module has no output.

5. The power supply circuit as described in claim 4, characterized in that, The high-voltage protection module includes a detection unit and a switching unit; The switching unit is connected between the input terminal of the output switching module and the power supply. The detection unit is connected to the output terminal of the output switching module, the output terminal of the second conversion circuit, and the control terminal of the switching unit. The detection unit is used to control the switching unit to turn off the connection between the input terminal of the output switching module and the power supply port when the second conversion circuit outputs the rated voltage and the output terminal of the output switching module has no output.

6. The power supply circuit as described in claim 5, characterized in that, The detection unit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third switching device, and a fourth switching device; The control terminal of the third switching device is connected to the output terminal of the output switching module through the fifth resistor and grounded through the sixth resistor; the first terminal of the third switching device is connected to the control terminal of the fourth switching device; and the third switching device is grounded. The control terminal of the fourth switching device is connected to the output terminal of the second conversion circuit through the seventh resistor and grounded through the eighth resistor; the first terminal of the fourth switching device is connected to the control terminal of the switching unit; and the second terminal of the fourth switching device is grounded. The third switching device is configured to turn off when the output switching module does not output the supply voltage, and the fourth switching device is configured to turn on when the second conversion circuit outputs the rated voltage and the third switching device is turned off.

7. The power supply circuit as described in claim 5, characterized in that, The switching unit includes a third capacitor, a ninth resistor, a second Zener diode, and a relay; The third capacitor is connected between the output terminal of the second conversion circuit and the detection unit. The negative terminal of the second Zener diode is connected to the output terminal of the second conversion circuit, and the positive terminal of the second Zener diode is connected to the detection unit. The coil of the relay is connected between the output terminal of the second conversion circuit and the detection unit. The common terminal of the relay is used to connect to the power supply. The normally closed contact of the relay is connected to the input terminal of the output switch module. The normally open contact of the relay is grounded through the ninth resistor.

8. The power supply circuit according to any one of claims 1 to 3, characterized in that, The power supply circuit also includes an input filter module, the first terminal of which is connected to the input terminal of the high voltage protection module, and the second terminal of which is grounded.

9. The power supply circuit according to any one of claims 1 to 3, characterized in that, The power supply circuit also includes a transient voltage suppression diode, the positive terminal of which is grounded and the negative terminal of which is connected to the input terminal of the high voltage protection module.

10. An electronic device, characterized in that, Includes the power supply circuit as described in any one of claims 1 to 9.

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