Surge suppression circuit, surge suppression device, and power supply equipment

Abstract

The utility model relates to the technical field of power supplies, and discloses a surge suppression circuit, a surge suppression device and power supply equipment, the surge suppression circuit is connected to an external power supply, the surge suppression circuit comprises a driving module, the driving module is connected with a switching signal end, the driving module is used for obtaining a switching voltage signal of the switching signal end, and the switching voltage signal is output to the external power supply; outputting a driving signal based on the switching voltage signal; the control module is connected to an external power supply, and the control module is connected with the driving module and the power supply output end and used for receiving the driving signal and outputting the input voltage of the external power supply to the power supply output end; and the voltage detection module is connected with the external power supply and the control module and is used for sending a turn-off signal to the control module when detecting that the voltage of the external power supply is greater than a preset voltage value, and the control module receives the turn-off signal to turn off the voltage input to the power supply output end. Therefore, the cost of circuit break protection is reduced.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a surge suppression circuit, a surge suppression device, and a power supply device. Background Art

[0002] During the use of a car, due to cable corrosion, poor contact, etc., the engine may be disconnected from the battery while it is running, causing abnormal output voltage. If some protective measures are not added to address this phenomenon, it will cause damage to the product.

[0003] In traditional technology, a common measure is to add a TVS tube at the power input end, but high-power TVS tubes are expensive.

[0004] Application Contents

[0005] The main purpose of the present application is to propose a surge suppression circuit, a surge suppression device and a power supply device, aiming to solve the problem of high cost of power failure protection solutions for power supplies in traditional technologies.

[0006] To achieve the above object, the present application provides a surge suppression circuit, the surge suppression circuit is connected to an external power supply, and the surge suppression circuit includes:

[0007] A driving module, the driving module is connected to the switch signal terminal, the driving module is used to obtain the switch voltage of the switch signal terminal, and output a driving signal based on the switch voltage;

[0008] A control module, the control module is connected to the external power supply, the control module is connected to the driving module and the power supply output terminal respectively, and is used to receive the driving signal and output the input voltage of the external power supply to the power supply output terminal;

[0009] A voltage detection module, wherein the voltage detection module is connected to the external power supply and the control module respectively, and is used to send a shutdown signal to the control module when it is detected that the voltage of the external power supply is greater than a preset voltage value, and the control module receives the shutdown signal to disconnect the voltage input to the power supply output terminal.

[0010] Optionally, the driving module includes:

[0011] A boost driving unit, the boost driving unit is connected to the switch signal end, and is used to receive the switch voltage of the switch signal end, and boost the switch voltage and then output it;

[0012] A voltage stabilizing unit, the voltage stabilizing unit is connected to the control module and the boost driving unit respectively, and is used to receive the boosted switching voltage and output it to the control module after stabilizing the voltage.

[0013] Optionally, the boost driving unit includes:

[0014] A first capacitor, a first end of the first capacitor is connected to the switch signal end;

[0015] a first diode, wherein a first end of the first diode is connected to a second end of the first capacitor, and a second end of the first diode is connected to the voltage stabilizing unit;

[0016] a second diode, wherein a first end of the second diode is connected to a second end of the first capacitor, and a second end of the second diode is connected to the voltage stabilizing unit;

[0017] A fourth diode, wherein a first end of the fourth diode is connected to the control module, and a second end of the fourth diode is connected to the second end of the second resistor.

[0018] Optionally, the voltage stabilizing unit includes:

[0019] a first resistor, wherein a first end of the first resistor is connected to the first capacitor;

[0020] a third diode, a first end of the third diode being connected to the second end of the first resistor, and a second end of the third diode being grounded;

[0021] a second resistor, a first end of the second resistor being connected to a second end of the first resistor;

[0022] A second capacitor, wherein a first end of the second capacitor is connected to a second end of the second resistor, and a second end of the second capacitor is grounded.

[0023] Optionally, the control module includes:

[0024] A field effect tube, wherein the first end of the field effect tube is connected to the external power supply, the second end of the field effect tube is connected to the power supply output end, and the control end of the field effect tube is connected to the second end of the second diode.

[0025] Optionally, the control module further includes:

[0026] A third resistor, wherein a first end of the third resistor is connected to the control end of the field effect transistor, and a second end of the third resistor is connected to the second end of the second diode.

[0027] Optionally, the voltage detection module includes:

[0028] a fourth resistor, a first end of the fourth resistor being connected to the first end of the field effect transistor;

[0029] a fifth resistor, a first end of the fifth resistor being connected to the second end of the fourth resistor, and a second end of the fifth resistor being grounded;

[0030] A transistor, wherein the first end of the transistor is connected to the second end of the fourth resistor, the second end of the transistor is connected to the first end of the field effect transistor, and the third end of the transistor is grounded.

[0031] Optionally, the voltage detection module further includes:

[0032] A third capacitor, a first end of the third capacitor is connected to the first end of the field effect transistor, and a second end of the third capacitor is grounded;

[0033] A sixth resistor, wherein a first end of the sixth resistor is connected to the first end of the field effect tube.

[0034] In addition, to achieve the above-mentioned purpose, the present application provides a surge suppression device, which includes the surge suppression circuit as described above.

[0035] In addition, to achieve the above-mentioned purpose, the present application provides a power supply device, which includes the surge suppression device as described above.

[0036] The present application provides a surge suppression circuit, which is connected to an external power supply, and the surge suppression circuit includes: a driving module, which is connected to a switch signal terminal, and is used to obtain a switch voltage signal of the switch signal terminal, and output a driving signal based on the switch voltage signal; a control module, which is connected to the external power supply, and is respectively connected to the driving module and the power supply output terminal, and is used to receive the driving signal and output the input voltage of the external power supply to the power supply output terminal; a voltage detection module, which is respectively connected to the external power supply and the control module, and is used to send a shutdown signal to the control module when it is detected that the voltage of the external power supply is greater than a preset voltage value, and the control module receives the shutdown signal to disconnect the voltage input to the power supply output terminal. The present application sends a driving signal to the control module through the driving module, so that when the input voltage is normal, the input voltage is normally supplied by the control module, and when the input voltage is abnormal, a shutdown signal is sent to the control module through the voltage detection module, and the control module is turned off to disconnect the power supply, so that the power supply is stopped when a surge voltage occurs, thereby protecting the power supply equipment. Compared with the traditional protection method through TVS tube, the cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the structure of a surge suppression circuit provided in one embodiment of the present application;

[0038] Figure 2 A schematic diagram of the structure of a driving module in a surge suppression circuit provided in an embodiment of the present application;

[0039] Figure 3 A schematic diagram of the structure of a boost driving unit in a surge suppression circuit provided in an embodiment of the present application;

[0040] Figure 4 A schematic diagram of the structure of a boost driving unit in a surge suppression circuit provided in an embodiment of the present application;

[0041] Figure 5 A schematic diagram of the circuit structure of a surge suppression circuit provided in one embodiment of the present application.

[0042] Description of Figure Numbers:

[0043] Label name Label name 10 Driver module 20 Switching Circuit 30 Voltage detection module DC_DC_SW Switch signal terminal 11 Boost drive unit 12 Voltage stabilizing unit D1-D4 The first to fourth diodes C1-C4 First to fourth capacitor Q1 Field Effect Transistor Q2 triode R1-R6 The first to sixth resistors

[0044] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0050] During the use of the car, due to cable corrosion, poor contact and other reasons, the engine may be disconnected from the battery while it is running, resulting in abnormal output voltage. If some protection measures are not added to address this phenomenon, it will cause product damage. In traditional technology, a common measure is to add a TVS tube to the power input short circuit, but high-power TVS tubes are expensive. In addition, the traditional method of protecting high voltage through TVS tubes is ineffective.

[0051] Based on this, the present application provides a surge suppression circuit, a surge suppression device and a power supply device, wherein the surge suppression circuit includes: a driving module, a control module and a voltage detection module; the present application sends a driving signal to the control module through the driving module, so that when the input voltage is normal, the input voltage is normally supplied through the control module, and when the input voltage is greater than a preset voltage value, a shutdown signal is sent to the control module through the voltage detection module, and the control module is turned off to disconnect the power supply, so that the power supply is stopped when a surge voltage occurs, thereby protecting the power supply device. Compared with the traditional protection method through TVS tubes, the cost is greatly reduced.

[0052] The present application provides a surge suppression circuit.

[0053] In one embodiment of the present application, refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a surge suppression circuit provided in an embodiment of the present application. The surge suppression circuit is connected to an external power supply, and the surge suppression circuit includes:

[0054] A driving module 10, wherein the driving module is connected to the switch signal terminal, and the driving module 10 is used to obtain a switch voltage signal from the switch signal terminal and output a driving signal based on the switch voltage signal;

[0055] A control module 20, the control module 20 is connected to the external power supply, the control module 20 is respectively connected to the driving module 10 and the power supply output terminal, and is used to receive the driving signal and output the input voltage of the external power supply to the power supply output terminal;

[0056] A voltage detection module 30 is connected to the external power supply and the control module 20 respectively, and is used to send a shutdown signal to the control module 20 when it is detected that the voltage of the external power supply is greater than a preset voltage value or a surge voltage occurs. The control module 20 receives the shutdown signal and disconnects the voltage input to the power supply output terminal.

[0057] It should be noted that the switch signal terminal is DC_DC_SW, and the switch signal terminal DC_DC_SW is connected to the SW terminal of the power switch, that is, the voltage of the switch signal terminal DC_DC_SW is obtained from the SW terminal, that is, the SW terminal is based on the on and off trigger signal of the switch, and the voltage signal of the switch signal terminal DC_DC_SW is specifically in the form of a square wave. In other words, when the switch is turned on, the switch signal terminal DC_DC_SW receives the trigger signal, which is a switch voltage signal, and the drive module 10 outputs a drive signal to the control module 20 based on the switch voltage signal.

[0058] In this embodiment, if Figure 1 As shown, the voltage of the external power supply is input to the power supply input terminal. When the input voltage of the external power supply is normal, the driving module 10 drives the control module 20 to turn on, thereby outputting the voltage of the external power supply to the power supply output terminal. When the input voltage of the external power supply is abnormal, the abnormality is detected by the voltage detection module 30, and a shutdown signal is sent to the control module 20. The control module 20 shuts down after receiving the shutdown signal, thereby disconnecting the voltage of the external power supply from being input to the power supply output terminal.

[0059] It should be noted that the input voltage is normal when it is within a preset range or lower than a preset voltage value, the surge voltage is a voltage higher than the normal voltage, and the input voltage is abnormal when it is higher than the preset voltage value. Thus, when the voltage detection module 30 detects the presence of a surge voltage, it sends a shutdown signal to the control module 20, and the control module 20 is shut down when it receives the shutdown signal, thereby disconnecting the voltage of the external power supply from being input to the power supply output terminal. Furthermore, the power supply is stopped when a surge voltage occurs, protecting the power supply equipment. Compared with the traditional protection method through TVS tubes, the cost is greatly reduced, and the effect of high-voltage power-off is improved, thereby improving the reliability of the power supply equipment.

[0060] Optionally, in some feasible embodiments, reference Figure 2 , Figure 2 This is a schematic diagram of the structure of a driving module in a surge suppression circuit provided in an embodiment of the present application. The driving module 10 includes:

[0061] A boost driving unit 11, the boost driving unit 11 is connected to the switch signal terminal DC_DC_SW, and is used to receive the switch voltage signal and boost the switch voltage signal before outputting it;

[0062] The voltage stabilizing unit 12 is connected to the control module 20 and the boost driving unit 11 respectively, and is used for receiving the boosted switching voltage and outputting it to the control module 20 after stabilizing the voltage.

[0063] In this embodiment, when the switch is turned on, the switching voltage at the SW end is transmitted to the switching signal end DC_DC_SW, and is transmitted to the voltage stabilizing unit 12 after being boosted by the boost driving unit 11. The voltage stabilizing unit 12 stabilizes the boosted switching voltage signal and transmits it to the control module 20, thereby turning on the control module 20.

[0064] For example, if the voltage of the driving control module 20 needs to be 40V, when the boost driving unit 11 increases the voltage to 50V, the voltage stabilizing unit 12 stabilizes the increased voltage and then outputs it to the control module 20, thereby turning on the driving control module 20. When the voltage detection module 30 detects the occurrence of a surge voltage, it sends a shutdown signal to the control module 20. The control module 20 is closed when it receives the shutdown signal, thereby disconnecting the voltage of the external power supply from being input to the power supply output terminal. In addition, the power supply is stopped when a surge voltage occurs, thereby protecting the power supply equipment. Compared with the traditional protection method through TVS tubes, the cost is greatly reduced.

[0065] Optionally, in some feasible embodiments, reference Figure 3 , Figure 3 This is a schematic diagram of the structure of a boost drive unit in a surge suppression circuit provided in an embodiment of the present application. The boost drive unit 11 includes:

[0066] A first capacitor C1, wherein a first end of the first capacitor C1 is connected to the switch signal end DC_DC_SW;

[0067] A first diode D1, wherein a first end of the first diode D1 is connected to a second end of the first capacitor C1, and a second end of the first diode D1 is connected to the control module 20;

[0068] A second diode D2 , wherein a first end of the second diode D2 is connected to a second end of the first capacitor C1 , and a second end of the second diode C2 is connected to the control module 20 .

[0069] In this embodiment, the first capacitor C1, the first diode D1 and the second diode D2 form a boost circuit, i.e., a voltage doubling circuit, so that the switch voltage signal of the switch signal terminal DC_DC_SW is boosted and transmitted to the control module 20, so that the control module 20 is driven by the boosted voltage. It should be noted that the boost drive unit 11 can also be composed of other devices required for boosting, such as inductors and capacitors.

[0070] Optionally, in some feasible embodiments, reference Figure 4 , Figure 4 This is a schematic diagram of the structure of a boost driving unit in a surge suppression circuit provided in an embodiment of the present application, wherein the voltage stabilizing unit 12 further includes:

[0071] A first resistor R1, wherein a first end of the first resistor R1 is connected to the first capacitor C1;

[0072] a third diode D3, wherein a first end of the third diode D3 is connected to the second end of the first resistor R1, and a second end of the third diode D3 is grounded;

[0073] a second resistor R2, wherein a first end of the second resistor R2 is connected to a second end of the first resistor R1;

[0074] A second capacitor C2, wherein a first end of the second capacitor C2 is connected to a second end of the second resistor R2, and a second end of the second capacitor C2 is grounded;

[0075] A fourth diode C4, a first end of the fourth diode is connected to the control module 20, and a second end of the fourth diode is connected to the second end of the second resistor.

[0076] In this embodiment, the third diode D3 is a voltage stabilizing diode. If the voltage boosted by the boost circuit is higher than the voltage of the drive control module 20, the voltage is stabilized by the third diode D3 and then transmitted to the control module 20. The first resistor R1 serves to limit the current of the third diode D3. The second resistor R2 and the second capacitor C2 constitute a filter circuit, which serves to filter and rectify the boost drive unit 11. The fourth diode C4 serves to reverse the boosted switch voltage into the input circuit, which is a circuit from the external power supply through the control module 20 to the power supply output end.

[0077] Optionally, in some feasible embodiments, reference Figure 5 , Figure 5 This is a schematic diagram of the circuit structure of a surge suppression circuit provided in an embodiment of the present application. The control module 10 includes:

[0078] Field effect transistor Q1, the first end of the field effect transistor Q1 is connected to the external power supply, the second end of the field effect transistor Q1 is connected to the power supply output end, and the control end of the field effect transistor Q1 is connected to the second end of the second diode C2.

[0079] In this embodiment, if a surge voltage lower than the preset voltage value occurs, it is borne by the D pole and S pole of the field effect tube Q1, thereby protecting the powered equipment. When the voltage detection module 30 detects a surge voltage higher than the preset voltage value, it sends a shutdown signal to the field effect tube Q1. When the field effect tube Q1 receives the shutdown signal, it is turned off, thereby disconnecting the voltage of the external power supply from being input to the power supply output terminal. In addition, the power supply is stopped when the surge voltage occurs, thereby protecting the powered equipment. Compared with the traditional protection method through the TVS tube, the cost is greatly reduced.

[0080] Optionally, in some feasible embodiments, reference Figure 5 , the control module further includes:

[0081] A third resistor R3, wherein a first end of the third resistor R3 is connected to the control end of the field effect transistor Q1, and a second end of the third resistor R3 is connected to the second end of the second diode C2.

[0082] In this embodiment, the third resistor R3 is used to prevent the gate (G electrode) of the field effect transistor Q1 from being damaged.

[0083] Optionally, in some feasible embodiments, reference Figure 5 , the voltage detection module 30 includes:

[0084] A fourth resistor R4, a first end of the fourth resistor R4 is connected to the first end of the field effect transistor Q1;

[0085] a fifth resistor R5, wherein a first end of the fifth resistor R5 is connected to a second end of the fourth resistor R4, and a second end of the fifth resistor R5 is grounded;

[0086] A transistor Q2, wherein a first end of the transistor Q2 is connected to a second end of the fourth resistor R4, a second end of the transistor Q2 is connected to a first end of the field effect transistor Q1, and a third end of the transistor Q2 is grounded.

[0087] In this embodiment, if the voltage at the power input terminal is higher than the preset voltage value, the transistor Q2 is provided with a start condition, that is, when the voltage at the power input terminal is higher than the preset voltage value, the transistor Q2 is turned on, and the voltage input to the transistor Q2 is adjusted by the fourth resistor R4 and the fifth resistor R5, so that when the input voltage of the external power supply is normal, the voltage input to the transistor Q2 cannot turn on the transistor Q2, so that the field effect transistor Q2 works normally and outputs the voltage at the power input terminal to the power output terminal. When the input voltage of the external power supply is abnormal, that is, when the input voltage of the external power supply is higher than the preset voltage value, the transistor Q2 is turned on, and the voltage of the gate (G pole) of the field effect transistor Q1 is pulled down by the collector of the transistor Q2, that is, the pulled down voltage is a shutdown signal, so that the field effect transistor Q1 is turned off, thereby disconnecting the voltage of the external power supply from being input to the power output terminal. Furthermore, the power supply is stopped when the surge voltage occurs, protecting the power supply equipment. Compared with the traditional method of protection by TVS tube, the cost is greatly reduced.

[0088] Optionally, in some feasible embodiments, reference Figure 5 , the voltage detection module also includes:

[0089] A third capacitor C3, a first end of the third capacitor C3 is connected to the first end of the field effect transistor Q1, and a second end of the third capacitor C3 is grounded;

[0090] A sixth resistor R6, wherein a first end of the sixth resistor R6 is connected to a first end of the field effect transistor Q1.

[0091] In this embodiment, the third capacitor C3 filters the signal input to the transistor Q2, that is, the input voltage of the external power supply is filtered and transmitted to the transistor Q2, thereby improving the accuracy of controlling the transistor Q2, and further improving the accuracy of stopping the power supply when the surge voltage occurs. The sixth resistor R6 provides the necessary conditions for the conduction of the transistor, so that when the transistor Q2 detects that the voltage at the power input terminal is higher than the preset voltage value, it sends a shutdown signal to the field effect transistor Q1, thereby turning off the field effect transistor Q1.

[0092] The present application also proposes a surge suppression device, which includes a surge suppression circuit. The specific structure of the surge suppression circuit refers to the above-mentioned embodiment. Since the optimized surge suppression device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0093] The present application also proposes a power supply device, which includes a surge suppression device. The specific structure of the surge suppression circuit in the surge suppression device refers to the above-mentioned embodiment. Since the present optimized power supply device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0094] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the application concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A surge suppression circuit, It is characterized in that The surge suppression circuit is connected to an external power supply, and the surge suppression circuit includes: A driving module, the driving module is connected to the switch signal end, the driving module is used to obtain a switch voltage signal of the switch signal end, and output a driving signal based on the switch voltage signal; A control module, the control module is connected to the external power supply, the control module is connected to the driving module and the power supply output terminal respectively, and is used to receive the driving signal and output the input voltage of the external power supply to the power supply output terminal; A voltage detection module, wherein the voltage detection module is connected to the external power supply and the control module respectively, and is used to send a shutdown signal to the control module when it is detected that the voltage of the external power supply is greater than a preset voltage value, and the control module receives the shutdown signal to disconnect the voltage input to the power supply output terminal.

2. The surge suppression circuit according to claim 1, It is characterized in that The driving module comprises: A boost driving unit, the boost driving unit is connected to the switch signal terminal, and is used to receive the switch voltage signal, and boost the switch voltage signal and then output it; A voltage stabilizing unit, the voltage stabilizing unit is connected to the control module and the boost driving unit respectively, and is used to receive the boosted switching voltage signal and output it to the control module after stabilizing the voltage.

3. The surge suppression circuit according to claim 2, It is characterized in that The boost drive unit comprises: A first capacitor, a first end of the first capacitor is connected to the switch signal end; a first diode, wherein a first end of the first diode is connected to a second end of the first capacitor, and a second end of the first diode is connected to the voltage stabilizing unit; A second diode, wherein a first end of the second diode is connected to a second end of the first capacitor, and a second end of the second diode is connected to the voltage stabilizing unit.

4. The surge suppression circuit according to claim 3, It is characterized in that The voltage stabilizing unit comprises: a first resistor, wherein a first end of the first resistor is connected to the first capacitor; a third diode, a first end of the third diode being connected to the second end of the first resistor, and a second end of the third diode being grounded; a second resistor, a first end of the second resistor being connected to a second end of the first resistor; a second capacitor, wherein a first end of the second capacitor is connected to a second end of the second resistor, and a second end of the second capacitor is grounded; A fourth diode, wherein a first end of the fourth diode is connected to the control module, and a second end of the fourth diode is connected to the second end of the second resistor.

5. The surge suppression circuit according to claim 4, It is characterized in that The control module comprises: A field effect tube, wherein the first end of the field effect tube is connected to the external power supply, the second end of the field effect tube is connected to the power supply output end, and the control end of the field effect tube is connected to the second end of the second diode.

6. The surge suppression circuit according to claim 5, It is characterized in that The control module also includes: A third resistor, wherein a first end of the third resistor is connected to the control end of the field effect transistor, and a second end of the third resistor is connected to the second end of the second diode.

7. The surge suppression circuit according to claim 6, It is characterized in that The voltage detection module comprises: a fourth resistor, a first end of the fourth resistor being connected to the first end of the field effect transistor; a fifth resistor, a first end of the fifth resistor being connected to the second end of the fourth resistor, and a second end of the fifth resistor being grounded; A transistor, wherein the first end of the transistor is connected to the second end of the fourth resistor, the second end of the transistor is connected to the first end of the field effect transistor, and the third end of the transistor is grounded.

8. The surge suppression circuit according to claim 7, It is characterized in that The voltage detection module also includes: A third capacitor, a first end of the third capacitor is connected to the first end of the field effect transistor, and a second end of the third capacitor is grounded; A sixth resistor, wherein a first end of the sixth resistor is connected to the first end of the field effect tube.

9. A surge suppression device, It is characterized in that The surge suppression device comprises a surge suppression circuit as described in any one of claims 1-8.

10. A power supply device, It is characterized in that The power supply equipment comprises the surge suppression device according to claim 9.

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