Overvoltage self-locking module power supply circuit and power supply device

Abstract

The utility model discloses an overvoltage self-locking module power supply circuit and a power supply device, comprising an input module, a power supply modulation module, a voltage detection module and a self-locking module, the modulation end of the power supply modulation module is connected with the output end of the input module to adjust the output voltage; the output end of the voltage detection module is connected with the feedback end of the power supply modulation module, the input end of the self-locking module is connected with the modulation end of the power supply modulation module to obtain the magnitude of input voltage, and the first output end of the self-locking module is connected with the power supply end of the power supply modulation module. The second output end of the self-locking module is connected with the feedback end of the power supply modulation module, and when the output voltage exceeds a voltage threshold value, the first output end of the self-locking module can lower the voltage of the power supply end of the power supply modulation module, and the second output end of the self-locking module can lower the voltage of the feedback end of the power supply modulation module. The design does not need a special IC, and is reasonable in cost and safe and reliable in power supply.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, and particularly relates to an overvoltage self-locking module power supply circuit and a power supply device. Background Art

[0002] In the existing power supply circuit, the input voltage is modulated by a power supply modulation module to form an output voltage for output. In order to stabilize the output voltage, a voltage detection module is usually configured to detect the output voltage and feedback the detection result to the feedback terminal of the power supply modulation module. When the output voltage is overvoltage, the power supply modulation module can stop the output of the output voltage. Even if the power supply modulation module uses a dedicated IC chip, it can also pull down the voltages of the feedback terminal and the power supply terminal during overvoltage, thereby shielding the feedback signal and making the IC chip enter the standby state, restricting the power supply circuit from continuing to supply power, and ensuring power supply safety. However, the dedicated IC chip is expensive, resulting in a high cost for constructing the power supply circuit, while the control accuracy of ordinary IC chips is low, which does not meet the needs of users. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides an overvoltage self-locking module power supply circuit and a power supply device with reasonable cost and reliable power supply safety.

[0004] An overvoltage self-locking module power supply circuit according to an embodiment of the first aspect of the utility model includes: an input module, the input end of the input module is used to connect with a power supply; a power supply modulation module, the output end of the input module is connected to the power supply end of the power supply modulation module to supply power to the power supply modulation module, and the modulation end of the power supply modulation module is connected to the output end of the input module to adjust the output voltage; a voltage detection module, the sampling end of the voltage detection module is connected to the modulation end of the power supply modulation module to detect the magnitude of the output voltage to form a feedback signal, the output end of the voltage detection module is connected to the feedback end of the power supply modulation module, and the voltage detection module modulates the output voltage according to the feedback signal; a self-locking module, the input end of the self-locking module is connected to the modulation end of the power supply modulation module to obtain the magnitude of the input voltage, the first output end of the self-locking module is connected to the power supply end of the power supply modulation module, the second output end of the self-locking module is connected to the feedback end of the power supply modulation module, and when the output voltage exceeds the voltage threshold, the first output end of the self-locking module can pull down the voltage of the power supply end of the power supply modulation module and the second output end of the self-locking module can pull down the voltage of the feedback end of the power supply modulation module.

[0005] An overvoltage self-locking module power supply circuit according to an embodiment of the utility model has at least the following beneficial effects:

[0006] The overvoltage self-locking module power supply circuit of the present utility model. The input module is connected to the power supply. The output end of the input module provides a startup voltage for the power supply modulation module. The power supply modulation module operates to modulate according to the voltage provided by the output end of the input module. The voltage detection module detects the magnitude of the output voltage, so as to form an output voltage at the modulation end of the power supply modulation module to supply power to the load. The input end of the self-locking module also obtains the output voltage at the same time. When the output voltage exceeds the voltage threshold, the self-locking module pulls down the voltage of the power supply end of the power supply modulation module, so that the power supply modulation module goes into standby, and at the same time pulls down the voltage of the feedback end of the power supply modulation module, shielding the input of the feedback signal of the input voltage, thus achieving multi-directional self-locking and restricting the power supply modulation module from modulating an output voltage to continue power supply. And this design does not need to use a dedicated IC, and realizes overvoltage self-locking through the combination of the power supply modulation module and the self-locking module, with reasonable cost and safe and reliable power supply.

[0007] According to some embodiments of the present utility model, the self-locking module includes a voltage stabilizing unit and a self-locking unit. The input end of the voltage stabilizing unit is connected to the modulation end of the power supply modulation module to obtain the magnitude of the input voltage. The output end of the voltage stabilizing unit is connected to the input end of the self-locking unit. The first output end of the self-locking unit is connected to the power supply end of the power supply modulation module. The second output end of the self-locking unit is connected to the feedback end of the power supply modulation module. The first output end of the self-locking unit can pull down the voltage of the power supply end of the power supply modulation module and the second output end of the self-locking unit can pull down the voltage of the feedback end of the power supply modulation module.

[0008] According to some embodiments of the present utility model, the voltage stabilizing unit includes a voltage stabilizing diode ZD1. The negative electrode of the voltage stabilizing diode ZD1 is connected to the modulation end of the power supply modulation module, and the positive electrode of the voltage stabilizing diode ZD1 is connected to the input end of the self-locking unit.

[0009] According to some embodiments of the present utility model, the self-locking unit includes a semiconductor switching tube Q1, a semiconductor switching tube Q3, a semiconductor switching tube Q4, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, and a capacitor C3. One end of the resistor R2 is respectively connected to one end of the resistor R3, one end of the capacitor C1, and the power supply terminal of the power modulation module. The other end of the resistor R2 is connected to the input terminal of the switching tube Q3. The controlled terminal of the switching tube Q3 is respectively connected to the other end of the resistor R3, the other end of the capacitor C1, and one end of the resistor R4. The output terminal of the switching tube Q3 is respectively connected to the controlled terminal of the switching tube Q4, one end of the resistor R5, one end of the resistor R7, and one end of the capacitor C3. The output terminal of the voltage stabilization unit is connected to the other end of the resistor R7. The other end of the resistor R4 is connected to the input terminal of the switching tube Q4. The output terminal of the switching tube Q4 is respectively connected to the other end of the resistor R5, one end of the capacitor C2, one end of the resistor R6, and the controlled terminal of the switching tube Q1. The input terminal of the switching tube Q1 is connected to the feedback terminal of the power modulation module. The other end of the capacitor C3, the other end of the capacitor C2, the other end of the resistor R6, and the output terminal of the switching tube Q1 are all grounded.

[0010] According to some embodiments of the present utility model, the switching tube Q1 and the switching tube Q4 are N-type switching tubes, and the switching tube Q3 is a P-type switching tube.

[0011] According to some embodiments of the present utility model, the self-locking module further includes an isolation unit, and the output terminal of the voltage stabilization unit is connected to the input terminal of the self-locking unit through the isolation unit.

[0012] According to some embodiments of the present utility model, the isolation unit includes an optocoupler. The emitter of the optocoupler is connected to the voltage stabilization unit, and the receiver of the optocoupler is connected to the other end of the resistor R7.

[0013] According to some embodiments of the present utility model, the isolation unit further includes a resistor R14, a capacitor C6, and a resistor R15. One end of the resistor R15 is connected to the positive electrode of the voltage stabilizing diode ZD1. The other end of the resistor R15 is respectively connected to one end of the capacitor C6, one end of the resistor R14, and the positive electrode of the emitter of the optocoupler. The other end of the capacitor C6, the other end of the resistor R14, and the negative electrode of the emitter of the optocoupler are all grounded.

[0014] According to some embodiments of the present utility model, the power modulation module includes a switching power supply module, the switching power supply module includes a control unit and a switching unit, a power supply terminal of the control unit is respectively connected to an output terminal of the input module and a first output terminal of the self-locking module, a feedback terminal of the control unit is respectively connected to an output terminal of the voltage detection module and a second output terminal of the self-locking module, a switching control terminal of the control unit is connected to a controlled terminal of the switching unit, a first end of the switching unit is respectively connected to an output terminal of the input module and a sampling terminal of the voltage detection module, and a second end of the switching unit is grounded.

[0015] The power supply device according to the second aspect embodiment of the present utility model includes an overvoltage self-locking module power supply circuit disclosed in any one of the above embodiments.

[0016] The power supply device according to the embodiment of the present utility model has at least the following beneficial effects:

[0017] The power supply device of the present utility model applies an overvoltage self-locking module power supply circuit disclosed in any one of the above embodiments, does not need to use a dedicated IC, and realizes overvoltage self-locking through the combination of a power modulation module and a self-locking module, with reasonable cost and safe and reliable power supply.

[0018] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0020] Figure 1 is a schematic block diagram of the principle structure of one embodiment of the overvoltage self-locking module power supply circuit of the present utility model;

[0021] Figure 2 is a schematic circuit diagram of one embodiment of the overvoltage self-locking module power supply circuit of the present utility model.

[0022] Reference numerals:

[0023] Input module 100; Power modulation module 200; Voltage detection module 300; Self-locking module 400; Voltage stabilization unit 410; Self-locking unit 420; Isolation unit 430. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation of the present utility model.

[0025] In the description of the present utility model, it should be understood that for the orientation description, terms such as "upper", "lower", "front", "rear", "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. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0026] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the number itself, and "above", "below", "within", etc. are understood as including the number itself. If the first and second are described, it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] Such as Figure 1 、 2As shown in the figure, an overvoltage self-locking module 400 power supply circuit according to an embodiment of the first aspect of the present invention includes an input module 100, a power modulation module 200, a voltage detection module 300, and a self-locking module 400. The input end of the input module 100 is used to connect to a power supply. The output end of the input module 100 is connected to the power supply end of the power modulation module 200 to supply power to the power modulation module 200. The modulation end of the power modulation module 200 is connected to the output end of the input module 100 to adjust the output voltage. The sampling end of the voltage detection module 300 is connected to the modulation end of the power modulation module 200 to detect the magnitude of the output voltage to form a feedback signal. The output end of the voltage detection module 300 is connected to the feedback end of the power modulation module 200. The voltage detection module 300 modulates the output voltage according to the feedback signal. The input end of the self-locking module 400 is connected to the modulation end of the power modulation module 200 to obtain the magnitude of the input voltage. The first output end of the self-locking module 400 is connected to the power supply end of the power modulation module 200. The second output end of the self-locking module 400 is connected to the feedback end of the power modulation module 200. When the output voltage exceeds the voltage threshold, the first output end of the self-locking module 400 can pull down the voltage of the power supply end of the power modulation module 200 and the second output end of the self-locking module 400 can pull down the voltage of the feedback end of the power modulation module 200.

[0029] Among them, the input module 100 may include a rectification unit and a filtering unit. The rectification unit may be a full-wave rectifier bridge or a half-wave rectifier bridge composed of multiple diodes. The power supply provides alternating current. The rectification unit rectifies the alternating current to form direct current, and after being filtered by the filtering unit, it is provided to the power modulation module 200.

[0030] The output end of the input module 100 can form a supply voltage for supplying power to the power modulation module 200 through a capacitive voltage reduction unit or other voltage reduction chips and their accessory circuits. The output end of the input module 100 is connected to the modulation end of the power modulation module 200, so that the output voltage is formed after being modulated by the modulation end of the power modulation module 200 and supplied to the load.

[0031] Among them, it can be understood that the self-locking module 400 may be composed of discrete components, or may be composed of an integrated chip independent of the power modulation module 200 and its accessory circuits.

[0032] In some embodiments of the present utility model, the power modulation module 200 includes a switching power supply module, and the switching power supply module includes a control unit and a switching unit. The power supply terminal of the control unit is respectively connected to the output terminal of the input module 100 and the first output terminal of the self-locking module 400. The feedback terminal of the control unit is respectively connected to the output terminal of the voltage detection module 300 and the second output terminal of the self-locking module 400. The switching control terminal of the control unit is connected to the controlled terminal of the switching unit. The head end of the switching unit is respectively connected to the output terminal of the input module 100 and the sampling terminal of the voltage detection module 300, and the tail end of the switching unit is grounded.

[0033] The control unit can be selected from the control ICs of a conventional switching power supply module, and the switching unit can be selected from semiconductor switching tubes. The control unit outputs a PWM control signal according to the sampling signal fed back by the voltage detection module 300 to control the operation of the switching unit, so as to modulate the voltage output by the output module to form an output voltage, and then the output voltage is provided to the primary coil of the transformer, and after voltage transformation, it supplies power to the load.

[0034] For the overvoltage self-locking module 400 power supply circuit of the present utility model, the input module 100 is connected to the power supply. The output terminal of the input module 100 provides a startup voltage for the power supply terminal of the power modulation module 200. The power modulation module 200 operates to modulate according to the voltage provided by the output terminal of the input module 100. The voltage detection module 300 detects the magnitude of the output voltage, so as to form an output voltage at the modulation terminal of the power modulation module 200 to supply power to the load. The input terminal of the self-locking module 400 also obtains the output voltage at the same time. When the output voltage exceeds the voltage threshold, the self-locking module 400 pulls down the voltage of the power supply terminal of the power modulation module 200, so that the power modulation module 200 stands by, and pulls down the voltage of the feedback terminal of the power modulation module 200 to shield the input of the feedback signal of the input voltage, so as to perform multi-directional self-locking, restricting the power modulation module 200 from modulating the output voltage to continue power supply. And this design does not need to use a dedicated IC, and realizes overvoltage self-locking through the combination of the power modulation module 200 and the self-locking module 400, with reasonable cost and safe and reliable power supply.

[0035] In some embodiments of the present utility model, such as Figure 2As shown, the self-locking module 400 includes a voltage stabilization unit 410 and a self-locking unit 420. The input end of the voltage stabilization unit 410 is connected to the modulation end of the power supply modulation module 200 to obtain the magnitude of the input voltage. The output end of the voltage stabilization unit 410 is connected to the input end of the self-locking unit 420. The first output end of the self-locking unit 420 is connected to the power supply end of the power supply modulation module 200, and the second output end of the self-locking unit 420 is connected to the feedback end of the power supply modulation module 200. The first output end of the self-locking unit 420 can pull down the voltage of the power supply end of the power supply modulation module 200 and the second output end of the self-locking unit 420 can pull down the voltage of the feedback end of the power supply modulation module 200.

[0036] Among them, the voltage stabilization unit 410 is used to detect the output voltage. When the output voltage is higher than the voltage threshold, the voltage stabilization unit 410 forms a stable trigger signal and provides it to the input end of the self-locking unit 420, thereby triggering the self-locking unit 420 to pull down the voltage of the power supply end of the power supply modulation module 200 and pull down the voltage of the feedback end of the power supply modulation module 200.

[0037] In some embodiments of the present invention, as Figure 2 shown, the voltage stabilization unit 410 includes a voltage stabilizing diode ZD1. The negative electrode of the voltage stabilizing diode ZD1 is connected to the modulation end of the power supply modulation module 200, and the positive electrode of the voltage stabilizing diode ZD1 is connected to the input end of the self-locking unit 420.

[0038] Specifically, as Figure 2 shown, when the output voltage is greater than 18V, the voltage stabilizing diode ZD1 conducts, and the positive electrode of the voltage stabilizing diode ZD1 outputs a trigger signal to the input end of the self-locking unit 420.

[0039] In some embodiments of the present utility model, the self-locking unit 420 includes a semiconductor switching tube Q1, a semiconductor switching tube Q3, a semiconductor switching tube Q4, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, and a capacitor C3. One end of the resistor R2 is respectively connected to one end of the resistor R3, one end of the capacitor C1, and the power supply terminal of the power supply modulation module 200. The other end of the resistor R2 is connected to the input terminal of the switching tube Q3. The controlled terminal of the switching tube Q3 is respectively connected to the other end of the resistor R3, the other end of the capacitor C1, and one end of the resistor R4. The output terminal of the switching tube Q3 is respectively connected to the controlled terminal of the switching tube Q4, one end of the resistor R5, one end of the resistor R7, and one end of the capacitor C3. The output terminal of the voltage stabilizing unit 410 is connected to the other end of the resistor R7. The other end of the resistor R4 is connected to the input terminal of the switching tube Q4. The output terminal of the switching tube Q4 is respectively connected to the other end of the resistor R5, one end of the capacitor C2, one end of the resistor R6, and the controlled terminal of the switching tube Q1. The input terminal of the switching tube Q1 is connected to the feedback terminal of the power supply modulation module 200. The other end of the capacitor C3, the other end of the capacitor C2, the other end of the resistor R6, and the output terminal of the switching tube Q1 are all grounded.

[0040] When the voltage stabilizing unit 410 outputs a trigger signal to the self-locking unit 420, the switching tube Q4 conducts, causing the switching tube Q3 to conduct, thereby pulling down the voltage of the power supply terminal of the power supply modulation module 200. At the same time, the switching tube Q1 also conducts, thereby pulling down the voltage of the feedback terminal of the power supply modulation module 200 and shielding the feedback signal from entering the feedback terminal of the power supply modulation module 200.

[0041] In some embodiments of the present utility model, the switching tube Q1 and the switching tube Q4 are N-type switching tubes, and the switching tube Q3 is a P-type switching tube. Specifically, the switching tube Q1 can be selected as a MOS tube, so the switching tube Q1 is an N-channel MOS tube, and the switching tubes Q3 and Q4 are selected as triodes, so the switching tube Q3 is a PNP-type triode, and the switching tube Q4 is an NPN-type triode.

[0042] In some embodiments of the present utility model, as Figure 2 shown, the self-locking module 400 further includes an isolation unit 430. The output terminal of the voltage stabilizing unit 410 is connected to the input terminal of the self-locking unit 420 through the isolation unit 430.

[0043] Specifically, the isolation unit 430 includes an optocoupler. The light emitter of the optocoupler is connected to the voltage stabilizing unit 410, and the light receiver of the optocoupler is connected to the other end of the resistor R7.

[0044] In some embodiments of the present utility model, the isolation unit 430 further includes a resistor R14, a capacitor C6, and a resistor R15. One end of the resistor R15 is connected to the positive electrode of the voltage stabilizing diode ZD1. The other end of the resistor R15 is respectively connected to one end of the capacitor C6, one end of the resistor R14, and the positive electrode of the light emitting device of the optocoupler. The other end of the capacitor C6, the other end of the resistor R14, and the negative electrode of the light emitting device of the optocoupler are all grounded.

[0045] The power supply device according to the second aspect embodiment of the present utility model includes an overvoltage self-locking module 400 power supply circuit disclosed in any of the above embodiments.

[0046] The power supply device of the present utility model applies an overvoltage self-locking module 400 power supply circuit disclosed in any of the above embodiments. Without using a dedicated IC, overvoltage self-locking is achieved through the combination of the power modulation module 200 and the self-locking module 400. The cost is reasonable, and the power supply is safe and reliable.

[0047] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0048] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. An overvoltage self-locking module power supply circuit, characterized in that: include: An input module, wherein an input terminal of the input module is used to be connected to a power supply; A power modulation module, wherein the output end of the input module is connected to the power supply end of the power modulation module to supply power to the power modulation module, and the modulation end of the power modulation module is connected to the output end of the input module to adjust the output voltage; A voltage detection module, wherein a sampling end of the voltage detection module is connected to a modulation end of the power modulation module to detect the magnitude of the output voltage to form a feedback signal, an output end of the voltage detection module is connected to a feedback end of the power modulation module, and the voltage detection module modulates the output voltage according to the feedback signal; A self-locking module, wherein the input end of the self-locking module is connected to the modulation end of the power modulation module to obtain the size of the input voltage, the first output end of the self-locking module is connected to the power supply end of the power modulation module, and the second output end of the self-locking module is connected to the feedback end of the power modulation module. When the output voltage exceeds a voltage threshold, the first output end of the self-locking module can pull down the voltage of the power supply end of the power modulation module and the second output end of the self-locking module can pull down the voltage of the feedback end of the power modulation module.

2. The overvoltage self-locking module power supply circuit according to claim 1, characterized in that: The self-locking module includes a voltage stabilizing unit and a self-locking unit. The input end of the voltage stabilizing unit is connected to the modulation end of the power modulation module to obtain the size of the input voltage. The output end of the voltage stabilizing unit is connected to the input end of the self-locking unit. The first output end of the self-locking unit is connected to the power supply end of the power modulation module. The second output end of the self-locking unit is connected to the feedback end of the power modulation module. The first output end of the self-locking unit can pull down the voltage of the power supply end of the power modulation module and the second output end of the self-locking unit can pull down the voltage of the feedback end of the power modulation module.

3. The overvoltage self-locking module power supply circuit according to claim 2, characterized in that: The voltage stabilizing unit includes a voltage stabilizing tube ZD1, a cathode of the voltage stabilizing tube ZD1 is connected to a modulation end of the power modulation module, and a cathode of the voltage stabilizing tube ZD1 is connected to an input end of the self-locking unit.

4. The overvoltage self-locking module power supply circuit according to claim 3, characterized in that: The self-locking unit includes a semiconductor switch tube Q1, a semiconductor switch tube Q3, a semiconductor switch tube Q4, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2 and a capacitor C3, one end of the resistor R2 is respectively connected to one end of the resistor R3, one end of the capacitor C1 and the power supply end of the power modulation module, the other end of the resistor R2 is connected to the input end of the switch tube Q3, the controlled end of the switch tube Q3 is respectively connected to the other end of the resistor R3, the other end of the capacitor C1 and one end of the resistor R4, the output end of the switch tube Q3 is respectively connected to the output end of the switch tube Q4 The controlled end, one end of the resistor R5, one end of the resistor R7 and one end of the capacitor C3 are connected, the output end of the voltage stabilizing unit is connected to the other end of the resistor R7, the other end of the resistor R4 is connected to the input end of the switch tube Q4, the output end of the switch tube Q4 is respectively connected to the other end of the resistor R5, one end of the capacitor C2, one end of the resistor R6 and the controlled end of the switch tube Q1, the input end of the switch tube Q1 is connected to the feedback end of the power modulation module, and the other end of the capacitor C3, the other end of the capacitor C2, the other end of the resistor R6 and the output end of the switch tube Q1 are all grounded.

5. The overvoltage self-locking module power supply circuit according to claim 4, characterized in that: The switch tube Q1 and the switch tube Q4 are N-type switch tubes, and the switch tube Q3 is a P-type switch tube.

6. The overvoltage self-locking module power supply circuit according to claim 4, characterized in that: The self-locking module further includes an isolation unit, and the output end of the voltage stabilizing unit is connected to the input end of the self-locking unit through the isolation unit.

7. An overvoltage self-locking module power supply circuit according to claim 6, characterized in that: The isolation unit includes a photoelectric coupler, the light emitter of the photoelectric coupler is connected to the voltage stabilizing unit, and the light receiver of the photoelectric coupler is connected to the other end of the resistor R7.

8. The overvoltage self-locking module power supply circuit according to claim 7, characterized in that: The isolation unit also includes a resistor R14, a capacitor C6 and a resistor R15, one end of the resistor R15 is connected to the positive electrode of the voltage regulator tube ZD1, and the other end of the resistor R15 is respectively connected to one end of the capacitor C6, one end of the resistor R14 and the positive electrode of the light emitter of the photoelectric coupler, and the other end of the capacitor C6, the other end of the resistor R14 and the negative electrode of the light emitter of the photoelectric coupler are all grounded.

9. The overvoltage self-locking module power supply circuit according to claim 1, characterized in that: The power modulation module includes a switching power module, and the switching power module includes a control unit and a switch unit. The power supply end of the control unit is respectively connected to the output end of the input module and the first output end of the self-locking module, the feedback end of the control unit is respectively connected to the output end of the voltage detection module and the second output end of the self-locking module, the switch regulation end of the control unit is connected to the controlled end of the switch unit, the head end of the switch unit is respectively connected to the output end of the input module and the sampling end of the voltage detection module, and the tail end of the switch unit is grounded.

10. A power supply device, characterized in that: It comprises an overvoltage self-locking module power supply circuit as described in any one of claims 1 to 9.

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