Over-current protection circuit and over-current protection method

Abstract

The invention discloses an overcurrent protection circuit and an overcurrent protection method, the overcurrent protection circuit comprises an on-off module, a sampling module and a control module, a first end of the on-off module is connected with a power supply, a second end of the on-off module is connected with a first end of the sampling module, and a second end of the sampling module is connected with a second end of the control module. The control end of the on-off module is connected with the output end of the control module; the second end of the sampling module is connected with electric equipment, the third end of the sampling module is connected with the first input end of the control module, and the sampling module is used for converting the output current of the power supply into voltage; a second input end of the control module is connected with the power supply; and the control module is used for receiving the voltage value of the sampling module, and controlling the on-off module to be switched off under the condition that the voltage value is greater than or equal to a preset overcurrent threshold value and the duration is greater than or equal to a switching-off threshold value.

Description

Technical Field

[0001] The present application relates to the field of overcurrent protection, and in particular to an overcurrent protection circuit and an overcurrent protection method. Background Art

[0002] At present, in the field of electronic circuit technology, the stability of circuit design has attracted more and more attention. Overcurrent is a common power supply abnormality phenomenon, which will cause circuit abnormality. In serious cases, safety accidents such as device and equipment burning may occur. Therefore, the design of overcurrent protection is very necessary.

[0003] In the related art, the overcurrent protection method is to use an electronic switch to cut off the high current loop. Since the electronic switch has the characteristics of fast response, high sensitivity, and the ability to disconnect the circuit in the order of us, the use of electronic switches for overcurrent protection often misjudges normal pulses and surges on the circuit as overcurrent, disconnects the circuit and causes unnecessary power failure of electrical equipment. Summary of the invention

[0004] The present application discloses an overcurrent protection circuit and an overcurrent protection method, which can solve the problem of unnecessary power failure of electrical equipment due to misjudgment in the related art.

[0005] In order to solve the above problems, this application adopts the following technical solutions:

[0006] In a first aspect, an embodiment of the present application discloses an overcurrent protection circuit, comprising: an on-off module, a sampling module and a control module, wherein: a first end of the on-off module is connected to a power supply, a second end of the on-off module is connected to a first end of the sampling module, and a control end of the on-off module is connected to an output end of the control module; a second end of the sampling module is connected to an electrical device, a third end of the sampling module is connected to a first input end of the control module, and the sampling module is used to convert the output current of the power supply into a voltage; a second input end of the control module is connected to the power supply; and the control module is used to receive a voltage value of the sampling module, and control the on-off module to disconnect when the voltage value is greater than or equal to a preset overcurrent threshold and lasts for a duration greater than or equal to a shutdown threshold.

[0007] In a second aspect, an embodiment of the present application discloses an overcurrent protection method, which is applied to the overcurrent protection circuit described in the first aspect above, including: receiving a voltage value of a sampling module; when the voltage value is greater than or equal to a preset overcurrent threshold and lasts for a duration greater than or equal to a shutdown threshold, controlling the on-off module to disconnect.

[0008] In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the second aspect are implemented.

[0009] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the method described in the second aspect are implemented.

[0010] In a fifth aspect, an embodiment of the present application provides a chip, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the method described in the second aspect.

[0011] In a sixth aspect, an embodiment of the present application provides a computer program product, which is stored in a storage medium and is executed by at least one processor to implement the method described in the second aspect.

[0012] An embodiment of the present application provides an overcurrent protection circuit, which includes an on-off module, a sampling module and a control module. The first end of the on-off module is connected to a power supply, the second end of the on-off module is connected to a first end of the sampling module, the control end of the on-off module is connected to an output end of the control module, the second end of the sampling module is connected to an electrical device, and the third end of the sampling module is connected to a first input end of the control module. The sampling module is used to convert an output current of the power supply into a voltage, the second input end of the control module is connected to the power supply, and the control module is used to receive a voltage value of the sampling module. When the voltage value is greater than or equal to a preset overcurrent threshold and the duration is greater than or equal to a shutdown threshold, it is considered that an overcurrent that has a substantial impact on the electrical device occurs. At this time, the control module sends a control signal to the control end of the on-off module to control the on-off module to disconnect, cut off the power supply circuit of the electrical device, and perform overcurrent protection, which can avoid unnecessary power failure of the electrical device due to misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of an overcurrent protection circuit disclosed in an embodiment of the present application;

[0014] Figure 2 A schematic diagram of a flow chart of an overcurrent protection method disclosed in an embodiment of the present application;

[0015] Figure 3 A schematic diagram of the structure of an electronic device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0017] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0018] The present application discloses an overcurrent protection circuit and an overcurrent protection method. Figure 1 A schematic diagram of the structure of an overcurrent protection circuit disclosed in an embodiment of the present application.

[0019] like Figure 1 As shown, the overcurrent protection circuit disclosed in the embodiment of the present application includes a switch module, a sampling module 110 and a control module 120, wherein: the first end of the switch module is connected to the power supply, the second end of the switch module is connected to the first end of the sampling module 110, and the control end of the switch module is connected to the output end of the control module 120; the second end of the sampling module 110 is connected to the electrical equipment, the third end of the sampling module 110 is connected to the first input end of the control module 120, and the sampling module 110 is used to convert the output current of the power supply into voltage; the second input end of the control module 120 is connected to the power supply; the control module 120 is used to receive the voltage value of the sampling module 110, and control the switch module to disconnect when the voltage value is greater than or equal to the preset overcurrent threshold and the duration is greater than or equal to the shutdown threshold.

[0020] In the present application, the control module 120 is powered by a power supply, and the on-off module is used to turn on or off the power of the electrical device.

[0021] When the power supply is started and the on-off module is turned on, the sampling module 110 converts the output current of the power supply into voltage, and transmits the corresponding voltage value to the control module 120 via the first input terminal of the control module 120. After receiving the voltage value of the sampling module 110, the control module 120 compares the voltage value with the preset overcurrent threshold. When the voltage value is greater than or equal to the preset overcurrent threshold and the duration is greater than or equal to the shutdown threshold, it is considered that an overcurrent has occurred that has a substantial impact on the electrical equipment. The control module 120 sends a control signal to the control end of the on-off module to control the on-off module to disconnect, cut off the power supply circuit of the electrical equipment, and perform overcurrent protection. At this time, the control module 120 can also set the power-on protection register in the control module 120 to be valid (i.e., 1). If the voltage value is greater than or equal to the preset overcurrent threshold, but the duration is less than the shutdown threshold, the control module 120 believes that the overcurrent at this time may be a transient overcurrent or a pulse current, which is caused by the circuit being affected by surges or grid instability, and is not a constant current, and will not damage the circuit or have a substantial impact on the electrical equipment. In this case, the on-off module is kept turned on to avoid unnecessary power failure of the electrical equipment. If the voltage value is less than the preset overcurrent threshold, it is considered to be in normal working condition.

[0022] The embodiment of the present application provides an overcurrent protection circuit, which includes an on-off module, a sampling module 110 and a control module 120. The first end of the on-off module is connected to the power supply, the second end of the on-off module is connected to the first end of the sampling module 110, the control end of the on-off module is connected to the output end of the control module 120, the second end of the sampling module 110 is connected to the electrical equipment, and the third end of the sampling module 110 is connected to the first input end of the control module 120. The sampling module 110 is used to convert the output current of the power supply into a voltage. The second input end of the control module 120 is connected to the power supply. The control module 120 is used to receive the voltage value of the sampling module 110. When the voltage value is greater than or equal to a preset overcurrent threshold and the duration is greater than or equal to the shutdown threshold, it is considered that an overcurrent that has a substantial impact on the electrical equipment occurs. At this time, the control module 120 sends a control signal to the control end of the on-off module to control the on-off module to disconnect, cut off the power supply circuit of the electrical equipment, and perform overcurrent protection, which can avoid unnecessary power failure of the electrical equipment due to misjudgment.

[0023] In an embodiment of the present application, the control module 120 can also be used to control the on-off module to be turned on when the duration of the on-off module being turned off is greater than or equal to a preset duration. That is to say, in the event of an overcurrent that has a substantial impact on the electrical equipment, the control module 120 controls the on-off module to be turned off and delays power-on. When the duration of the on-off module being turned off is greater than or equal to a preset duration, the control module 120 sends a control signal to the control end of the on-off module to control the on-off module to be turned on and automatically restore the power function without manual operation. By delaying power-on, it is possible to effectively prevent the adverse effects caused by turning on the on-off module again to restore the power function when the overcurrent phenomenon that has a substantial impact on the electrical equipment is not eliminated in time. In addition, when controlling the on-off module to be turned on and automatically restoring the power function, the control module 120 can also set the power-on protection register in the control module 120 to be invalid (i.e., 0).

[0024] In the embodiment of the present application, the shutdown threshold value may be a value determined according to the degree of influence of the duration of the preset overcurrent threshold value on the electrical device, and the shutdown threshold value is negatively correlated with the preset overcurrent threshold value. Since the shutdown threshold value is a value determined according to the degree of influence of the duration of the preset overcurrent threshold value on the electrical device, the overcurrent protection circuit disclosed in the present application can perform overcurrent protection more accurately.

[0025] In the present application, there may be multiple preset overcurrent thresholds. For example, a basic overcurrent threshold may be set, and N in the N-fold basic overcurrent threshold may be selected. Each value corresponds to a preset overcurrent threshold. For example, according to the overcurrent situation, the value of N may include 2, 3, 5, 8, and 10, and the corresponding preset overcurrent thresholds may include 2 times the basic overcurrent threshold, 3 times the basic overcurrent threshold, 5 times the basic overcurrent threshold, 8 times the basic overcurrent threshold, and 10 times the basic overcurrent threshold. According to the degree of influence of the duration of different preset overcurrent thresholds on the electrical equipment, the shutdown thresholds corresponding to each preset overcurrent threshold are determined respectively to perform more accurate overcurrent protection.

[0026] It should be noted that the shutdown threshold corresponds to the preset overcurrent threshold one-to-one. The larger the preset overcurrent threshold, the smaller the corresponding shutdown threshold is, and the smaller the preset overcurrent threshold, the larger the corresponding shutdown threshold is.

[0027] In one implementation, the control module 120 may store a correspondence table of preset overcurrent thresholds and shutdown thresholds, and the correspondence table includes a plurality of correspondences between preset overcurrent thresholds and shutdown thresholds. Exemplarily, the correspondence table includes a first preset overcurrent threshold and its corresponding first shutdown threshold, a second overcurrent threshold and its corresponding second shutdown threshold, a third overcurrent threshold and its corresponding third shutdown threshold, the first preset overcurrent threshold < the second preset overcurrent threshold < the third preset overcurrent threshold, and correspondingly, the first shutdown threshold > the second shutdown threshold > the third shutdown threshold. On this basis, when the control module 120 receives the voltage value from the sampling module 110, it first compares the voltage value with each preset overcurrent threshold. When the voltage value is less than the first preset overcurrent threshold, it is considered to be in a normal working state; when the voltage value is greater than or equal to the first preset overcurrent threshold and less than the second preset overcurrent threshold, its duration is further determined. If its duration is When the voltage value is greater than or equal to the second preset overcurrent threshold and less than the third preset overcurrent threshold, the duration is further determined. If the duration is also greater than or equal to the second shutdown threshold, the control module 120 controls the on-off module to disconnect. If the duration is less than the second shutdown threshold, the on-off module is kept on. When the voltage value is greater than or equal to the third preset overcurrent threshold, the duration is further determined. If the duration is also greater than or equal to the second shutdown threshold, the control module 120 controls the on-off module to disconnect. If the duration is less than the second shutdown threshold, the on-off module is kept on. When the voltage value is greater than or equal to the third preset overcurrent threshold, the duration is further determined. If the duration is also greater than or equal to the third shutdown threshold, the control module 120 controls the on-off module to disconnect. If the duration is less than the third shutdown threshold, the on-off module is kept on.

[0028] In one implementation, Figure 1 As shown, the sampling module 110 may include a sampling resistor and an operational amplifier, wherein the first end of the sampling resistor is connected to the second end of the on-off module, the second end of the sampling resistor is connected to the electrical device, and the sampling resistor is used to convert the output current of the power supply into a voltage; the first input end of the operational amplifier is connected to the first end of the sampling resistor, the second input end of the operational amplifier is connected to the second end of the sampling resistor, and the output end of the operational amplifier is connected to the first input end of the control module 120. That is, after the output current of the power supply is converted into a voltage through the sampling resistor, the operational amplifier amplifies the voltage on the sampling resistor, and transmits the amplified voltage value to the control module 120 via the first input end of the control module 120, so that the control module 120 can make an accurate judgment.

[0029] Exemplarily, the resistance of the sampling resistor can be a high-precision resistor of 0.050Ω. If the current output by the power supply is 5A, the voltage on the sampling resistor is 0.25V. If the operational amplifier can amplify the voltage on the sampling resistor by 20 times, the voltage value received by the control module 120 is 5V.

[0030] In one implementation, Figure 1 As shown, the control module 120 may include an analog-to-digital conversion module and a data processing module, wherein a first input terminal of the analog-to-digital conversion module is connected to a third terminal of the sampling module 110, a second input terminal of the analog-to-digital conversion module is connected to the power supply, an output terminal of the analog-to-digital conversion module is connected to an input terminal of the data processing module, and an output terminal of the data processing module is connected to a control terminal of the on-off module; the data processing module is used to receive target data output by the analog-to-digital conversion module, and control the on-off module to disconnect when the target data indicates that the voltage value of the sampling module 110 is greater than or equal to a preset overcurrent threshold and the duration is greater than or equal to a shutdown threshold.

[0031] In the present application, the analog-to-digital conversion module is powered by a power supply. After receiving the voltage value of the sampling module 110, the analog-to-digital conversion module converts the voltage value from an analog signal to a digital signal, obtains target data corresponding to the voltage value, and sends the target data to the data processing module. When the data processing module receives the target data, and the target data indicates that the voltage value of the sampling module 110 is greater than or equal to a preset overcurrent threshold and lasts for a period greater than or equal to the shutdown threshold, it is considered that an overcurrent has occurred that has a substantial impact on the electrical equipment. The data processing module sends a control signal to the control end of the on-off module to control the on-off module to disconnect, cut off the power supply circuit of the electrical equipment, and perform overcurrent protection.

[0032] In one implementation, the control module 120 may be a Field-Programmable Gate Array (FPGA) with a built-in analog-to-digital converter (ADC).

[0033] In one implementation, the on-off module may be a control switch.

[0034] In one possible implementation, Figure 1As shown, the overcurrent protection circuit may further include a first level conversion circuit, a second level conversion circuit and a third level conversion circuit, wherein the input end of the first level conversion circuit is connected to the output end of the control module 120, and the output end of the first level conversion circuit is connected to the control end of the on-off module; the input end of the second level conversion circuit is connected to the power supply, and the output end of the second level conversion circuit is connected to the second input end of the control module 120; the input end of the third level conversion circuit is connected to the third end of the sampling module 110, and the output end of the third level conversion circuit is connected to the first input end of the control module 120. The first level conversion circuit is used to convert the voltage output by the control module 120 into the driving voltage of the on-off module, the second level conversion circuit is used to convert the power supply voltage into a voltage within the input range of the control module 120, and the third level conversion circuit is used to convert the voltage of the sampling module 110 into a voltage within the input range of the control module 120.

[0035] In the embodiments of the present application, Figure 1 As shown, the control module 120 can also be connected to the host computer. The host computer configures the relevant register parameters in the control module 120 so that the control module 120 realizes the control function described above. The registers in the control module 120 may include a power-on protection register, an N-fold overcurrent threshold register, a shutdown threshold register, a sampling period register, a normal power supply threshold register, a delayed power-on time threshold register, a power-on status register, etc. In addition, the register status in the control module 120 can be queried by the host computer to know the circuit working state and the historical occurrence time, so as to timely judge the stability of the circuit and the reliability of the electric equipment, and prevent and avoid the occurrence of accidents and sudden problems. Exemplarily, if the on-off module is always in the off state and the power-on protection register is invalid, the control module 120 believes that the power is not turned on and no overcurrent that has a substantial impact on the electric equipment occurs; if the on-off module is in the off state and the power-on protection register is valid, it is determined that an overcurrent that has a substantial impact on the electric equipment occurs, the on-off module is disconnected, the power supply circuit of the electric equipment is cut off, and overcurrent protection is performed.

[0036] The overcurrent protection circuit disclosed in the present application can be applied to equipment and devices such as communications, robots, the Internet of Things, industrial control, and power automation, as well as to areas prone to lightning and unstable power supply where electrical equipment may be easily impacted frequently and cause device short circuits.

[0037] The embodiment of the present application also discloses an overcurrent protection method, which is applied to the above-mentioned overcurrent protection circuit. Figure 2 Schematic diagram of a flow chart of an overcurrent protection method disclosed in an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0038] S220 , receiving a voltage value from the sampling module 110 .

[0039] S240: When the voltage value is greater than or equal to a preset overcurrent threshold and the duration is greater than or equal to a shutdown threshold, control the on-off module to disconnect.

[0040] The overcurrent protection method provided in the embodiment of the present application receives the voltage value of the sampling module 110. When the voltage value is greater than or equal to the preset overcurrent threshold and lasts for a period greater than or equal to the shutdown threshold, an overcurrent that substantially affects the electrical equipment occurs, and the on-off module is controlled to disconnect, thereby avoiding unnecessary power failure of the electrical equipment due to misjudgment.

[0041] If the voltage value is greater than or equal to the preset overcurrent threshold, but the duration is less than the shutdown threshold, it is considered that the overcurrent at this time may be a transient overcurrent or pulse current, which is caused by the circuit being affected by surges or grid instability, not a constant current, and will not damage the circuit or have a substantial impact on the electrical equipment, so the on-off module is kept turned on. If the voltage value is less than the preset overcurrent threshold, it is considered to be in normal working condition.

[0042] In the embodiment of the present application, after the control on-off module is disconnected, it may also include: when the duration of the control on-off module being disconnected is greater than or equal to the preset duration, the control on-off module is turned on. That is to say, when the duration of the on-off module being disconnected is greater than or equal to the preset duration, the control on-off module is turned on, and the power supply function is automatically restored without manual operation. By delaying power-on, it is possible to effectively prevent the adverse effects caused by turning on the on-off module again to restore the power supply function when the overcurrent phenomenon that has a substantial impact on the electrical equipment is not eliminated in time.

[0043] In one implementation, the shutdown threshold is a value determined according to the degree of influence of the duration of the preset overcurrent threshold on the electrical device, and the shutdown threshold is negatively correlated with the preset overcurrent threshold. Since the shutdown threshold is a value determined according to the degree of influence of the duration of the preset overcurrent threshold on the electrical device, the overcurrent protection circuit disclosed in the present application can perform overcurrent protection more accurately.

[0044] Alternatively, if Figure 3 As shown, an embodiment of the present application also provides an electronic device 300, including a processor 301 and a memory 302, wherein the memory 302 stores programs or instructions that can be executed on the processor 301, and when the program or instructions are executed by the processor 301, the various steps of the above-mentioned overcurrent protection method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, they are not repeated here.

[0045] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0046] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned overcurrent protection method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0047] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0048] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned overcurrent protection method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0049] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0050] An embodiment of the present application provides a computer program product, which is stored in a storage medium. The program product is executed by at least one processor to implement the various processes of the overcurrent protection method embodiment described above, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0051] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0052] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An overcurrent protection circuit, characterized in that: include: On-off module, sampling module and control module, wherein: The first end of the on-off module is connected to the power supply, the second end of the on-off module is connected to the first end of the sampling module, and the control end of the on-off module is connected to the output end of the control module; The second end of the sampling module is connected to the power-consuming device, the third end of the sampling module is connected to the first input end of the control module, and the sampling module is used to convert the output current of the power supply into a voltage; The second input terminal of the control module is connected to the power supply; The control module is used to receive the voltage value of the sampling module, and control the on-off module to disconnect when the voltage value is greater than or equal to a preset overcurrent threshold and the duration is greater than or equal to a shutdown threshold.

2. The overcurrent protection circuit according to claim 1, characterized in that: The control module is further configured to control the on-off module to be turned on when the time duration for controlling the on-off module to be turned off is greater than or equal to a preset time duration.

3. The overcurrent protection circuit according to claim 1, characterized in that: The shutdown threshold is a value determined according to the degree of influence of the duration of the preset overcurrent threshold on the electrical device, and the shutdown threshold is negatively correlated with the preset overcurrent threshold.

4. The overcurrent protection circuit according to claim 1, characterized in that: The sampling module includes a sampling resistor and an operational amplifier, the first end of the sampling resistor is connected to the second end of the on-off module, the second end of the sampling resistor is connected to the electrical device, and the sampling resistor is used to convert the output current of the power supply into a voltage; The first input end of the operational amplifier is connected to the first end of the sampling resistor, the second input end of the operational amplifier is connected to the second end of the sampling resistor, and the output end of the operational amplifier is connected to the first input end of the control module.

5. The overcurrent protection circuit according to claim 1, characterized in that: The control module includes an analog-to-digital conversion module and a data processing module, wherein a first input terminal of the analog-to-digital conversion module is connected to a third terminal of the sampling module, a second input terminal of the analog-to-digital conversion module is connected to the power supply, an output terminal of the analog-to-digital conversion module is connected to an input terminal of the data processing module, and an output terminal of the data processing module is connected to a control terminal of the on-off module; The data processing module is used to receive the target data output by the analog-to-digital conversion module, and control the on-off module to disconnect when the target data indicates that the voltage value of the sampling module is greater than or equal to a preset overcurrent threshold and the duration is greater than or equal to a shutdown threshold.

6. The overcurrent protection circuit according to claim 1, characterized in that: It also includes a first level conversion circuit, a second level conversion circuit and a third level conversion circuit, wherein the input end of the first level conversion circuit is connected to the output end of the control module, and the output end of the first level conversion circuit is connected to the control end of the on-off module; The input end of the second level conversion circuit is connected to the power supply, and the output end of the second level conversion circuit is connected to the second input end of the control module; The input end of the third level conversion circuit is connected to the third end of the sampling module, and the output end of the third level conversion circuit is connected to the first input end of the control module.

7. The overcurrent protection circuit according to claim 1, characterized in that: The control module is also connected to the host computer.

8. An overcurrent protection method, characterized in that: The overcurrent protection circuit as claimed in any one of claims 1 to 7 comprises: Receive the voltage value of the sampling module; When the voltage value is greater than or equal to the preset overcurrent threshold and the duration is greater than or equal to the shutdown threshold, the on-off module is controlled to be disconnected.

9. The overcurrent protection method according to claim 8, characterized in that: After the control on-off module is disconnected, the method further comprises: When the duration of controlling the on-off module to be turned off is greater than or equal to the preset duration, the on-off module is controlled to be turned on.

10. The overcurrent protection method according to claim 8, characterized in that: The shutdown threshold is a value determined according to the degree of influence of the duration of the preset overcurrent threshold on the electrical equipment, and the shutdown threshold is negatively correlated with the preset overcurrent threshold.

11. An electronic device, characterized in that: It comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the overcurrent protection method as described in any one of claims 8 to 10 are implemented.

12. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the overcurrent protection method as described in any one of claims 8 to 10 are implemented.

13. A chip, characterized in that: The chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the overcurrent protection method as described in any one of claims 8-10.

14. A computer program product, characterized in that The program product is stored in a storage medium, and the program product is executed by at least one processor to implement the overcurrent protection method according to any one of claims 8 to 10.

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