A DC high voltage power supply short circuit protection device and method

Abstract

The DC high-voltage power supply short-circuit protection device provided in the present application includes a processor, a protection module, a sampling module and a comparison module, wherein the protection module, the sampling module and the comparison module are connected in series in sequence; the protection module is used to disconnect the DC high-voltage power supply short-circuit protection device when a short circuit occurs to protect the entire circuit, and the protection module includes at least a protection enable terminal, which is used to receive an enable signal output by the comparison module and control the disconnection or connection of the protection module; the sampling module includes at least a sampling circuit and a load, wherein the sampling circuit and the load are connected in parallel, the sampling circuit is used to collect the voltage of the load and input it into the comparison module, and the input terminal of the sampling module is connected to the power supply signal; the comparison module is used to compare a threshold value with the voltage output by the collection module and output the enable signal to control the on and off of the DC high-voltage power supply short-circuit protection device.

Description

Technical Field

[0001] The present application relates to the technical field of high-voltage power supply manufacturing, and in particular to a device and method for short-circuit protection of a DC high-voltage power supply. Background Art

[0002] Breakthroughs in power electronics, microprocessor technology, and new materials technology, coupled with the practical needs of power systems, are driving the rapid development of DC high-voltage power supplies. During operation, a DC high-voltage power supply can experience a transient short-circuit discharge (also known as a spark) from the load circuit to ground potential due to a vacuum environment or the instantaneous breakdown of high-voltage insulation. This phenomenon, known as a flashover, occurs within the load circuit. This can cause a transient overcurrent surge in the components of the DC high-voltage power supply's high-voltage output circuit, potentially damaging them or even degrading or damaging the power supply's insulation. Therefore, short-circuit protection is essential.

[0003] Existing short-circuit protection measures utilize a current sampling feedback signal from the output circuit of a DC high-voltage power supply, using closed-loop control to limit the output current or initiate a protective shutdown. This approach requires a long signal loop and a certain response time. Furthermore, for extremely brief short-circuit surges, current limiting cannot be guaranteed before the peak current reaches its peak, ensuring that even the shortest current peak is not missed. This approach cannot completely prevent failure and damage to the high-voltage power supply caused by short-circuit discharge surges. Therefore, a method is urgently needed to quickly limit the short-circuit surge currents that occur in the circuit to protect the components of the DC high-voltage power supply. Summary of the Invention

[0004] In view of this, the present application provides a DC high-voltage power supply short-circuit protection device and method for quickly limiting the extremely short-term short-circuit impact current occurring in the loop to protect the components of the DC high-voltage power supply.

[0005] Specifically, this application is implemented through the following technical solutions:

[0006] In a first aspect, the present application provides a DC high-voltage power supply short-circuit protection device, which includes at least a processor, a protection module, a sampling module, and a comparison module, wherein the protection module, the sampling module, and the comparison module are connected in series in sequence; wherein:

[0007] The protection module is configured to disconnect the DC high-voltage power supply short-circuit protection device when a short circuit occurs, so as to protect the entire circuit. The protection module includes at least a protection enable terminal, which is configured to receive an enable signal output by the comparison module and control the disconnection or connection of the protection module;

[0008] The sampling module at least includes a sampling circuit and a load, the sampling circuit and the load are connected in parallel, the sampling circuit is used to collect the voltage of the load and input it into the comparison module, the input end of the sampling module is connected to the power signal, and the output end of the sampling module is connected to the comparison module;

[0009] The comparison module is configured to compare the threshold value with the voltage output by the acquisition module and output the enable signal to control the on / off of the DC high-voltage power supply short-circuit protection device. The comparison module includes at least a first comparison input terminal and a second comparison input terminal, wherein the first comparison input terminal is connected to the output terminal of the sampling module and the second comparison input terminal is used to input the threshold value. The processor calculates the threshold value based on the size of the DC high-voltage power supply.

[0010] When the load is short-circuited, the acquisition module acquires the voltage change of the short circuit, compares it with the threshold value calculated and output by the processor, and outputs a disconnection enable signal to the protection circuit to control the protection circuit to disconnect, so that the DC high-voltage power supply is disconnected from the connected circuit.

[0011] Optionally, the sampling circuit includes a plurality of sampling resistors and current blockers connected in series; wherein,

[0012] The plurality of sampling resistors connected in series are used to collect the voltage of the load, and some of the sampling resistors in the plurality of sampling resistors connected in series are connected in parallel with the current blocker;

[0013] The current blocker is used to block the DC power supply. The input end of the current blocker is connected to the output end of the sampling resistors except for some of the sampling resistors. The output end of the current blocker is connected to the input end of the comparison module.

[0014] Optionally, the protection module includes a switch circuit and a power tube; wherein,

[0015] The switch circuit is used to control the on / off of the DC high-voltage power supply short-circuit protection device according to the enable signal output by the comparison module, and the output end of the switch circuit is connected to the input end of the power tube;

[0016] The power tube is used to amplify the signal power of the DC power supply so that it can drive a larger load. The input end of the power tube is connected to the output end of the switching circuit, and the output end of the power tube is connected to the input end of the load module.

[0017] Optionally, the DC high voltage power supply short circuit protection device further includes a reverse module; wherein,

[0018] The inversion module is used to change the polarity of the threshold signal calculated by the processor to obtain the threshold. The input end of the inversion module is connected to the processor, and the output end of the inversion module is connected to the comparison module.

[0019] Optionally, the reverse module includes an analog-to-digital converter, a digital-to-analog converter and a comparator; wherein,

[0020] The analog-to-digital converter is used to monitor the voltage output by the sampling module and the digital-to-analog converter, and the output end of the analog-to-digital converter is connected to the output end of the sampling module and the output end of the digital-to-analog converter;

[0021] The digital-to-analog converter is used to convert a continuous digital signal into a threshold signal, and the output end of the digital-to-analog converter is connected to the input end of the comparator;

[0022] The comparator is used to change the polarity of the threshold signal calculated by the processor to obtain the threshold, and the output end of the comparator is connected to the input end of the comparison module.

[0023] Optionally, the DC high voltage power supply short circuit protection device further includes a conversion module; wherein,

[0024] The conversion module is used to convert an AC signal into a DC signal. The conversion module at least includes a conversion circuit. The input end of the conversion module is connected to the power supply signal, and the output end of the conversion module is connected to the protection module.

[0025] Optionally, the conversion module includes a transformer, a first diode, a second diode and a first capacitor, and the conversion module is connected in parallel with the load; wherein,

[0026] The transformer is used to change the voltage of the AC power supply, and the first output terminal and the second output terminal of the transformer are connected in parallel with the first capacitor via a first diode and a second diode respectively;

[0027] The first diode and the second diode are used to convert AC power into DC power;

[0028] The first capacitor is used to maintain voltage stability and output the stabilized voltage to the load.

[0029] Optionally, when the load is working normally, the sampling module collects a first voltage value, the first voltage value is a positive value, and the first voltage value is greater than the threshold; after passing through the comparison module, a connection enable signal is output, the connection enable signal is a high-level signal, and the DC high-voltage power supply short-circuit protection device is working normally.

[0030] Optionally, when the load is short-circuited, the sampling module collects a second voltage value, the second voltage value is a negative value, and the second voltage value is less than the threshold value; after passing through the comparison module, a disconnection enable signal is output, the disconnection enable signal is a low-level signal, and the DC high-voltage power supply short-circuit protection device is disconnected to protect the entire circuit.

[0031] A second aspect of the present application provides a method for protecting a DC high-voltage power supply from short circuit. The method is applied to a DC high-voltage power supply short-circuit protection device. The DC high-voltage power supply short-circuit protection device includes at least a processor, a protection module, a sampling module, and a comparison module. The protection module, the sampling module, and the comparison module are sequentially connected in series. The method includes:

[0032] Calculating a threshold value according to the size of the DC high-voltage power supply; wherein the threshold value is the second comparison input terminal of the comparison module in the DC high-voltage power supply short-circuit protection device;

[0033] Detecting the voltage at the load after the DC high-voltage power supply short-circuit protection device supplies power;

[0034] Inputting the threshold value and the voltage at the load of the DC high-voltage power supply short-circuit protection device after power supply into a comparison module of the DC high-voltage power supply short-circuit protection device;

[0035] The on / off of the DC high-voltage power supply short-circuit protection device is controlled according to the enable signal output by the comparison module.

[0036] The present application provides a DC high-voltage power supply short-circuit protection device and method, wherein the DC high-voltage power supply short-circuit protection device comprises at least a processor, a protection module, a sampling module, and a comparison module; the protection module, the sampling module, and the comparison module are connected in series in sequence; wherein the protection module is used to disconnect when a short circuit occurs in the DC high-voltage power supply short-circuit protection device to protect the entire circuit, the protection module at least comprises a protection enable terminal, the protection enable terminal is used to receive an enable signal output by the comparison module, and control the disconnection or connection of the protection module; the sampling module at least comprises a sampling circuit and a load, the sampling circuit and the load The sampling circuit is connected in parallel, and is used to collect the voltage of the load and input it into the comparison module. The input end of the sampling module is connected to the power supply signal, and the output end of the sampling module is connected to the comparison module. The comparison module is used to compare the threshold value with the voltage output by the acquisition module and output the enable signal to control the on and off of the DC high-voltage power supply short-circuit protection device. The comparison module includes at least a first comparison input end and a second comparison input end, the first comparison input end is connected to the output end of the sampling module, and the second comparison input end is used to input the threshold value. The processor calculates the threshold value based on the size of the DC high-voltage power supply. The device provided in the present application, when detecting that the comparison module outputs a disconnect enable signal, limits the extremely short-term short-circuit impact current in the loop by disconnecting the protection circuit, thereby protecting the components of the DC high-voltage power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a circuit diagram of the first embodiment of the DC high-voltage power supply short-circuit protection device provided in this application;

[0038] Figure 2 This is a flow chart of Example 1 of the DC high-voltage power supply short-circuit protection method provided in this application. DETAILED DESCRIPTION

[0039] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0040] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0041] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0042] The present application provides a DC high-voltage power supply short-circuit protection device and method for quickly limiting the extremely short-term short-circuit impact current occurring in a loop to protect the components of the DC high-voltage power supply.

[0043] The present application provides a DC high-voltage power supply short-circuit protection device and method, wherein the DC high-voltage power supply short-circuit protection device comprises at least a processor, a protection module, a sampling module and a comparison module; the protection module, the sampling module and the comparison module are connected in series in sequence; wherein the protection module is used to disconnect when a short circuit occurs in the DC high-voltage power supply short-circuit protection device to protect the entire circuit, the protection module comprises at least a protection enable terminal, the protection enable terminal is used to receive an enable signal output by the comparison module, and control the disconnection or connection of the protection module; the sampling module comprises at least a sampling circuit and a load, the sampling circuit and the load are connected in parallel, the sampling circuit is used to collect the voltage of the load and input it into the comparison module, the sampling The input end of the module is connected to the power supply signal, and the output end of the sampling module is connected to the comparison module; the comparison module is used to compare the threshold with the voltage output by the acquisition module, and output the enable signal to control the on and off of the DC high-voltage power supply short-circuit protection device. The comparison module includes at least a first comparison input end and a second comparison input end, the first comparison input end is connected to the output end of the sampling module, and the second comparison input end is used to input the threshold; wherein, the processor calculates the threshold according to the size of the DC high-voltage power supply; the device provided in the present application, when it is detected that the comparison module outputs a disconnect enable signal, limits the extremely short-circuit impact current that appears in the loop by disconnecting the protection circuit, thereby protecting the components of the DC high-voltage power supply.

[0044] Specific embodiments are given below to introduce the technical solutions of the present application in detail.

[0045] Figure 1 This is a circuit diagram of the first embodiment of the DC high voltage power supply short circuit protection device provided by this application. Figure 1 ,exist Figure 1 In the example shown, the DC high-voltage power supply short-circuit protection device includes at least a processor 1, a protection module 2, a sampling module 3, and a comparison module 4, wherein the protection module 2, the sampling module 3, and the comparison module 4 are connected in series in sequence; wherein,

[0046] The protection module 2 is used to disconnect the DC high-voltage power supply short-circuit protection device when a short circuit occurs to protect the entire circuit. The protection module 2 at least includes a protection enable terminal P1, which is used to receive the enable signal output by the comparison module 4 and control the disconnection or connection of the protection module 2;

[0047] The sampling module 3 at least includes a sampling circuit G1 and a load G2, the sampling circuit G1 and the load G2 are connected in parallel, the sampling circuit G1 is used to collect the voltage of the load G2 and input it into the comparison module 4, the input end 31 of the sampling module 3 is connected to the power supply signal, and the output end 32 of the sampling module 3 is connected to the comparison module 4;

[0048] The comparison module 4 is used to compare the threshold value with the voltage output by the acquisition module 3 and output the enable signal to control the on / off of the DC high-voltage power supply short-circuit protection device. The comparison module 4 includes at least a first comparison input terminal 41 and a second comparison input terminal 42. The first comparison input terminal 41 is connected to the output terminal 32 of the sampling module 3, and the second comparison input terminal 42 is used to input the threshold value. The processor 1 calculates the threshold value according to the size of the DC high-voltage power supply.

[0049] When the load G2 is short-circuited, the acquisition module 3 collects the voltage change of the short circuit, compares it with the threshold value calculated and output by the processor 1, and outputs a disconnection enable signal to the protection module 2 to control the protection module 2 to disconnect, so that the DC high-voltage power supply is disconnected from the connected circuit.

[0050] Optionally, the sampling circuit G1 includes a plurality of sampling resistors S1 and current blockers S2 connected in series; wherein,

[0051] The plurality of sampling resistors S1 connected in series are used to collect the voltage of the load G2, and some of the sampling resistors S1 in the plurality of sampling resistors S1 connected in series are connected in parallel with the current blocker S2;

[0052] The current blocker S2 is used to block the DC power supply. The input end of the current blocker S2 is connected to the output ends of the sampling resistors S1 except for some of the sampling resistors S1. The output end of the current blocker S2 is connected to the first comparison input end 41 of the comparison module 4.

[0053] Optionally, the protection module 2 includes a switch circuit P2 and a power tube P3; wherein,

[0054] The switch circuit P2 is used to control the on / off of the DC high-voltage power supply short-circuit protection device according to the enable signal output by the comparison module 4, and the output end of the switch circuit P2 is connected to the input end of the power tube P3;

[0055] The power tube P3 is used to amplify the signal power of the DC power supply so that it can drive a larger load. The input end of the power tube P3 is connected to the output end of the switch circuit P2, and the output end of the power tube P3 is connected to the input end of the load module G2.

[0056] Optionally, the DC high voltage power supply short circuit protection device further includes a reverse module 5; wherein,

[0057] The inverting module 5 is used to change the polarity of the threshold signal calculated by the processor 1 to obtain the threshold. The input end 51 of the inverting module 5 is connected to the processor 1 , and the output end 52 of the inverting module 5 is connected to the comparison module 4 .

[0058] Optionally, the reverse module 5 includes an analog-to-digital converter O1, a digital-to-analog converter O2 and a comparator O3; wherein,

[0059] The analog-to-digital converter O1 is used to monitor the voltage output by the sampling module 3 and the digital-to-analog converter O2. The output end of the analog-to-digital converter O1 is connected to the output end 32 of the sampling module 3 and the output end of the digital-to-analog converter O2.

[0060] The digital-to-analog converter O2 is used to convert a continuous digital signal into a threshold signal, and the output end of the digital-to-analog converter O2 is connected to the input end of the comparator O3;

[0061] The comparator O3 is used to change the polarity of the threshold signal calculated by the processor 1 to obtain the threshold. The output end of the comparator O3 is connected to the second comparison input end 42 of the comparison module 4.

[0062] Optionally, the DC high voltage power supply short circuit protection device further includes a conversion module 6; wherein,

[0063] The conversion module 6 is used to convert the AC signal into a DC signal. The conversion module 6 at least includes a conversion circuit T1 . The input end 61 of the conversion module 6 is connected to the power signal, and the output end 62 of the conversion module 6 is connected to the protection module 2 .

[0064] Optionally, the conversion module 6 includes a transformer T2, a first diode T3, a second diode T4 and a first capacitor T5, and the conversion module 6 is connected in parallel with the load G2; wherein,

[0065] The transformer T2 is used to change the voltage of the AC power supply. The first output terminal and the second output terminal of the transformer T2 are connected in parallel with the first capacitor T5 via the first diode T3 and the second diode T4 respectively.

[0066] The first diode T3 and the second diode T4 are used to convert AC power into DC power;

[0067] The first capacitor T5 is used to maintain voltage stability and output the stabilized voltage to the load G2.

[0068] Optionally, when the load G2 is working normally, the sampling module 3 collects a first voltage value, the first voltage value is a positive value, and the first voltage value is greater than the threshold value; after passing through the comparison module 4, a connection enable signal is output, the connection enable signal is a high-level signal, and the DC high-voltage power supply short-circuit protection device is working normally.

[0069] Optionally, when the load G2 is short-circuited, the sampling module 3 collects a second voltage value, the second voltage value is a negative value, and the second voltage value is less than the threshold value; after passing through the comparison module 4, a disconnection enable signal is output, the disconnection enable signal is a low-level signal, and the DC high-voltage power supply short-circuit protection device is disconnected to protect the entire circuit.

[0070] The DC high-voltage power supply short-circuit protection device provided in this embodiment includes at least a processor, a protection module, a sampling module, and a comparison module; the protection module, the sampling module, and the comparison module are connected in series in sequence; wherein the protection module is used to disconnect when a short circuit occurs in the DC high-voltage power supply short-circuit protection device to protect the entire circuit, the protection module at least includes a protection enable terminal, the protection enable terminal is used to receive an enable signal output by the comparison module, and control the protection module to disconnect or connect; the sampling module at least includes a sampling circuit and a load, the sampling circuit and the load are connected in parallel, the sampling circuit is used to collect the voltage of the load and input it into the comparison module, the sampling module The input end of the block is connected to the power supply signal, and the output end of the sampling module is connected to the comparison module; the comparison module is used to compare the threshold value with the voltage output by the acquisition module, and output the enable signal to control the on and off of the DC high-voltage power supply short-circuit protection device, and the comparison module includes at least a first comparison input end and a second comparison input end, the first comparison input end is connected to the output end of the sampling module, and the second comparison input end is used to input the threshold value; wherein, the processor calculates the threshold value according to the size of the DC high-voltage power supply; the device provided in the present application, when it is detected that the comparison module outputs a disconnect enable signal, limits the extremely short-term short-circuit impact current that appears in the loop by disconnecting the protection circuit, thereby protecting the components of the DC high-voltage power supply.

[0071] Figure 2 This is a flow chart of the first embodiment of the DC high voltage power supply short circuit protection method provided by this application. Please refer to Figure 2 The method provided in this embodiment is applied to a DC high-voltage power supply short-circuit protection device. The DC high-voltage power supply short-circuit protection device includes at least a processor, a protection module, a sampling module, and a comparison module. The protection module, the sampling module, and the comparison module are connected in series in sequence. The method includes:

[0072] S201. Calculate a threshold value according to the size of the DC high-voltage power supply; wherein the threshold value is the second comparison input terminal of the comparison module in the DC high-voltage power supply short-circuit protection device.

[0073] Specifically, the threshold is positively correlated with the size of the DC high-voltage power supply. That is, the larger the DC high-voltage power supply, the larger the threshold. In other words, the smaller the DC high-voltage power supply, the smaller the threshold. In practical implementation, the threshold can be calculated using a relevant formula.

[0074] S202: Detect the voltage at the load after the DC high-voltage power supply short-circuit protection device supplies power.

[0075] Specifically, the reading of the sampling resistor in series with the current blocker in the sampling circuit of the sampling module is read, and the reading of the sampling resistor is the voltage at the load of the DC high-voltage power supply short-circuit protection device after power supply.

[0076] S203 , input the threshold and the voltage at the load of the DC high-voltage power supply short-circuit protection device after power supply into a comparison module of the DC high-voltage power supply short-circuit protection device, and output an enable signal.

[0077] Specifically, in a possible implementation, if the voltage at the load of the DC high-voltage power supply short-circuit protection device after power supply is positive and greater than the threshold, the output enable signal is a connection enable signal.

[0078] In another possible implementation, if the voltage at the load of the DC high-voltage power supply short-circuit protection device after power supply is negative and less than the threshold, the output enable signal is a disconnect enable signal.

[0079] S204 : Controlling the on / off of the DC high-voltage power supply short-circuit protection device according to the enable signal output by the comparison module.

[0080] Specifically, in a possible implementation, if the output enable signal is a disconnect enable signal, the disconnect enable signal is a low-level signal, and the DC high-voltage power supply short-circuit protection device is controlled to disconnect to protect the entire circuit.

[0081] In another possible implementation, if the output enable signal is a connection enable signal, the connection enable signal is a high-level signal, and the DC high-voltage power supply short-circuit protection device is controlled to operate normally.

[0082] The present application provides a DC high-voltage power supply short-circuit protection method, which is applied to the DC high-voltage power supply short-circuit protection device, wherein the DC high-voltage power supply short-circuit protection device includes at least a processor, a protection module, a sampling module, and a comparison module; the protection module, the sampling module, and the comparison module are connected in series in sequence; wherein the protection module is used to disconnect the DC high-voltage power supply short-circuit protection device when a short circuit occurs to protect the entire circuit, the protection module at least includes a protection enable terminal, the protection enable terminal is used to receive the enable signal output by the comparison module, and control the protection module to disconnect or connect; the sampling module at least includes a sampling circuit and a load, the sampling circuit and the load are connected in parallel, and the sampling circuit is used to collect the current of the load. voltage and input it into the comparison module, the input end of the sampling module is connected to the power supply signal, and the output end of the sampling module is connected to the comparison module; the comparison module is used to compare the threshold value with the voltage output by the acquisition module, and output the enable signal to control the on and off of the DC high-voltage power supply short-circuit protection device, the comparison module includes at least a first comparison input end and a second comparison input end, the first comparison input end is connected to the output end of the sampling module, and the second comparison input end is used to input the threshold value; wherein, the processor calculates the threshold value according to the size of the DC high-voltage power supply; the device provided by the present application, when it is detected that the comparison module outputs the disconnection enable signal, limits the extremely short-circuit impact current that appears in the loop by disconnecting the protection circuit, thereby protecting the components of the DC high-voltage power supply.

[0083] The implementation process of the functions and effects of each unit in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, and will not be repeated here.

[0084] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to the partial description of the method embodiments. The device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0085] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A DC high voltage power supply short circuit protection device, characterized in that: The DC high-voltage power supply short-circuit protection device comprises at least a processor, a protection module, a sampling module and a comparison module, wherein the protection module, the sampling module and the comparison module are connected in series in sequence; wherein, The protection module is configured to disconnect the DC high-voltage power supply short-circuit protection device when a short circuit occurs, so as to protect the entire circuit. The protection module includes at least a protection enable terminal, which is configured to receive an enable signal output by the comparison module and control the disconnection or connection of the protection module; The sampling module at least includes a sampling circuit and a load, the sampling circuit and the load are connected in parallel, the sampling circuit is used to collect the voltage of the load and input it into the comparison module, the input end of the sampling module is connected to the power signal, and the output end of the sampling module is connected to the comparison module; The comparison module is configured to compare the threshold value with the voltage output by the acquisition module and output the enable signal to control the on / off of the DC high-voltage power supply short-circuit protection device. The comparison module includes at least a first comparison input terminal and a second comparison input terminal, wherein the first comparison input terminal is connected to the output terminal of the sampling module and the second comparison input terminal is used to input the threshold value. The processor calculates the threshold value based on the size of the DC high-voltage power supply. When the load is operating normally, the sampling module collects a first voltage value, the first voltage value is a positive value, and the first voltage value is greater than the threshold value; after passing through the comparison module, a connection enable signal is output, the connection enable signal is a high-level signal, and the DC high-voltage power supply short-circuit protection device is operating normally; When the load is short-circuited, the sampling module collects a second voltage value, which is a negative value and is less than the threshold value; after passing through the comparison module, a disconnection enable signal is output, and the disconnection enable signal is a low-level signal. The DC high-voltage power supply short-circuit protection device is disconnected to protect the entire circuit.

2. The device according to claim 1, characterized in that The sampling circuit includes a plurality of sampling resistors and current blockers connected in series; wherein, The plurality of sampling resistors connected in series are used to collect the voltage of the load, and some of the sampling resistors in the plurality of sampling resistors connected in series are connected in parallel with the current blocker; The current blocker is used to block the DC power supply. The input end of the current blocker is connected to the output ends of the sampling resistors except for some of the sampling resistors. The output end of the current blocker is connected to the first comparison input end of the comparison module.

3. The device according to claim 1, characterized in that The protection module includes a switch circuit and a power tube; wherein, The switch circuit is used to control the on / off of the DC high-voltage power supply short-circuit protection device according to the enable signal output by the comparison module, and the output end of the switch circuit is connected to the input end of the power tube; The power tube is used to amplify the signal power of the DC power supply so that it can drive a larger load. The input end of the power tube is connected to the output end of the switching circuit, and the output end of the power tube is connected to the input end of the load module.

4. The device according to claim 1, characterized in that The DC high voltage power supply short circuit protection device further includes a reverse module; wherein, The inversion module is used to change the polarity of the threshold signal calculated by the processor to obtain the threshold. The input end of the inversion module is connected to the processor, and the output end of the inversion module is connected to the comparison module.

5. The device according to claim 4, characterized in that The reverse module includes an analog-to-digital converter, a digital-to-analog converter and a comparator; wherein, The analog-to-digital converter is used to monitor the voltage output by the sampling module and the digital-to-analog converter, and the output end of the analog-to-digital converter is connected to the output end of the sampling module and the output end of the digital-to-analog converter; The digital-to-analog converter is used to convert a continuous digital signal into a threshold signal, and the output end of the digital-to-analog converter is connected to the input end of the comparator; The comparator is used to change the polarity of the threshold signal calculated by the processor to obtain the threshold, and the output end of the comparator is connected to the second comparison input end of the comparison module.

6. The device according to claim 1, characterized in that The DC high voltage power supply short circuit protection device further includes a conversion module; wherein, The conversion module is used to convert an AC signal into a DC signal. The conversion module at least includes a conversion circuit. The input end of the conversion module is connected to the power supply signal, and the output end of the conversion module is connected to the protection module.

7. The device according to claim 6, characterized in that The conversion module includes a transformer, a first diode, a second diode and a first capacitor, and the conversion module is connected in parallel with the load; wherein, The transformer is used to change the voltage of the AC power supply, and the first output terminal and the second output terminal of the transformer are connected in parallel with the first capacitor via a first diode and a second diode respectively; The first diode and the second diode are used to convert AC power into DC power; The first capacitor is used to maintain voltage stability and output the stabilized voltage to the load.

8. A method for short-circuit protection of a DC high-voltage power supply, characterized in that: The DC high-voltage power supply short-circuit protection method is applied to the DC high-voltage power supply short-circuit protection device according to any one of claims 1 to 7, wherein the DC high-voltage power supply short-circuit protection device comprises at least a processor, a protection module, a sampling module, and a comparison module, wherein the protection module, the sampling module, and the comparison module are connected in series in sequence; the method comprises: Calculating a threshold value according to the size of the DC high-voltage power supply; wherein the threshold value is the second comparison input terminal of the comparison module in the DC high-voltage power supply short-circuit protection device; Detecting the voltage at the load after the DC high-voltage power supply short-circuit protection device supplies power; Inputting the threshold value and the voltage at the load of the DC high-voltage power supply short-circuit protection device after power supply into a comparison module of the DC high-voltage power supply short-circuit protection device, and outputting an enable signal; The on / off of the DC high-voltage power supply short-circuit protection device is controlled according to the enable signal output by the comparison module.

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