Short circuit testing device for high voltage equipment

Abstract

The application discloses a short-circuit testing device of high-voltage equipment, which comprises an edge detection module, an action monitoring module, a signal conversion module, a counter and a contactor. The input end of the edge detection module is electrically connected with the detection end of the high-voltage equipment, and the output end of the edge detection module is electrically connected with the input end of the action monitoring module, the first input end of the signal conversion module and the input end of the counter. The edge detection module is used for outputting an edge detection signal according to the output voltage of the high-voltage equipment. The output end of the action monitoring module is electrically connected with the second input end of the signal conversion module, and the action monitoring module is used for outputting an action monitoring signal according to the edge detection signal. The output end of the signal conversion module is electrically connected with the contactor. The signal conversion module is used for outputting a short-circuit control signal to the contactor according to the edge detection signal and the action monitoring signal. The counter is used for counting the pulse number of the edge detection signal, which can effectively improve the testing effect and reduce the testing cost.

Description

Technical Field

[0001] This invention relates to the field of novel electronics, and more particularly to a short-circuit testing device for high-voltage equipment. Background Technology

[0002] With the rapid development of power electronics technology, power electronic devices such as switching power supplies are widely used in many core fields such as industrial control, new energy, and power transmission. The operational stability of these devices directly determines the reliability and safety of the entire power system. Short-circuit faults are one of the most common types of faults in the operation of power electronic equipment. The equipment's tolerance and recovery performance under short-circuit conditions are key indicators for measuring equipment quality and service life. Therefore, short-circuit testing of power electronic equipment is an essential part of product development, factory testing, and operation and maintenance.

[0003] High-voltage circuits, as a core component of power electronic equipment, require short-circuit testing that simulates actual short-circuit scenarios during equipment operation. This involves repeatedly short-circuiting and restarting the circuit to verify the equipment's stability under extreme conditions. Traditional short-circuit testing often relies on manual operation or semi-automatic testing modes, requiring the use of various instruments such as AC / DC power supplies, electronic loads, and oscilloscopes. This cumbersome process demands a high level of expertise from operators, significantly impacting testing efficiency and costs, and also carries substantial operational risks. Summary of the Invention

[0004] This invention provides a short-circuit testing device for high-voltage equipment to improve the efficiency of short-circuit testing of high-voltage equipment.

[0005] According to one aspect of the present invention, a short-circuit testing device for a voltage device is provided, comprising: an edge detection module, an action monitoring module, a signal conversion module, a counter, and a contactor; The input terminal of the edge detection module is electrically connected to the detection terminal of the high-voltage equipment, and the output terminal of the edge detection module is electrically connected to the input terminal of the action monitoring module, the first input terminal of the signal conversion module, and the input terminal of the counter; the edge detection module is used to output an edge detection signal according to the output voltage of the high-voltage equipment. The output terminal of the motion monitoring module is electrically connected to the second input terminal of the signal conversion module, and the motion monitoring module is used to output a motion monitoring signal according to the edge detection signal; The output terminal of the signal conversion module is electrically connected to the contactor; the signal conversion module is used to output a short-circuit control signal to the contactor according to the edge detection signal and the action monitoring signal. The counter is used to count the number of pulses of the edge detection signal.

[0006] Optionally, the detection terminals of the high-voltage equipment include a positive detection terminal and a negative detection terminal; the edge detection module includes: an edge detection circuit, an isolation output circuit, and a discharge bypass circuit; The first terminal of the edge detection circuit is electrically connected to the positive detection terminal, and the second terminal of the edge detection circuit is electrically connected to the first input terminal of the isolation output circuit and the output terminal of the discharge bypass circuit at the first node. The second input terminal of the isolation output circuit and the input terminal of the discharge bypass circuit are electrically connected to the negative detection terminal at the second node; the output terminal of the isolation output circuit is electrically connected to the input terminal of the action monitoring module, the first input terminal of the signal conversion circuit, and the input terminal of the counter. The edge detection circuit is used to output a first pulse signal through the second terminal when the voltage rise rate at the positive detection terminal exceeds a preset rate, and to output a first voltage signal through the second terminal when the voltage rise rate at the positive detection terminal is lower than or equal to the preset rate; the first voltage signal is lower than a first preset voltage. The isolated output circuit is used to output the edge detection signal at a first level when the potential of the first node is higher than the potential of the second node, and to output the edge detection signal at a second level when the potential of the first node is lower than or equal to the potential of the second node. The bypass discharge circuit is used to provide a discharge path when the potential of the first node is lower than the potential of the second node, and to remain off when the potential of the first node is lower than or equal to the potential of the second node.

[0007] Optionally, the edge detection circuit includes a first capacitor and a first resistor; The first capacitor and the first resistor are connected in series between the positive detection terminal and the first node.

[0008] Optionally, the isolated output circuit includes a first optocoupler and a second resistor; The first optocoupler includes a light-emitting diode (LED) and a phototransistor; the anode of the LED is electrically connected to the first node, and the cathode of the LED is electrically connected to the second node; the first terminal of the phototransistor is electrically connected to the first power supply terminal, the second terminal of the phototransistor is electrically connected to the first terminal of the second resistor at the third node, and the second terminal of the second resistor is electrically connected to the ground terminal. The third node is also electrically connected to the input terminal of the motion monitoring module, the first input terminal of the signal conversion module, and the input terminal of the counter.

[0009] Optionally, the bypass discharge circuit includes: a first diode; The anode of the first diode is electrically connected to the second node, and the cathode of the first diode is electrically connected to the first node.

[0010] Optionally, the motion monitoring module includes: a unidirectional transmission circuit, a pulse holding circuit, and a motion monitoring circuit; The input terminal of the unidirectional transmission circuit is electrically connected to the output terminal of the edge detection module, and the output terminal of the unidirectional transmission circuit is electrically connected to the input terminal of the motion monitoring circuit at the fourth node; the unidirectional transmission circuit is used to unidirectionally transmit the edge detection signal to the motion monitoring circuit. The first terminal of the pulse hold circuit is electrically connected to the fourth node, and the second terminal of the pulse hold circuit is electrically connected to the ground terminal; the pulse hold circuit is used to control the fourth node to maintain the first level when the edge detection signal periodically outputs the first level, and to control the fourth node to switch to the second level when the time for the edge detection signal to stop outputting the first level exceeds a first preset time. The output terminal of the motion monitoring circuit is electrically connected to the second input terminal of the signal conversion circuit; the motion monitoring circuit is used to output the motion monitoring signal according to the signal of the fourth node.

[0011] Optionally, the unidirectional transmission circuit includes: a second diode; The anode of the second diode is electrically connected to the output terminal of the edge detection module, and the cathode of the second diode is electrically connected to the fourth node.

[0012] Optionally, the pulse holding circuit includes: a second capacitor and a third resistor; The second capacitor and the third resistor are connected in parallel between the fourth node and the ground terminal.

[0013] Optionally, the motion monitoring circuit includes: a comparator, a fourth resistor, and a fifth resistor; The non-inverting input of the comparator is electrically connected to the fourth node, the inverting input of the comparator is electrically connected to the first voltage source through the fourth resistor, and the inverting input of the comparator is electrically connected to the ground terminal through the fifth resistor.

[0014] Optionally, the signal conversion module includes: a charge / discharge control circuit, a pull-down control circuit, an energy storage circuit, and a hysteresis output circuit; The first terminal of the charge / discharge control circuit is electrically connected to the output terminal of the edge detection module, the second terminal of the charge / discharge control circuit is electrically connected to the input terminal of the hysteresis output circuit at the fifth node, and the energy storage circuit is electrically connected between the fifth node and the ground terminal; the charge / discharge control circuit is used to charge the energy storage circuit when the edge detection signal is at the first level, and to discharge the energy storage circuit when the edge detection signal is at the second level. The input terminal of the pull-down control circuit is electrically connected to the output terminal of the motion monitoring module, and the output terminal of the pull-down control circuit is electrically connected to the fifth node; the pull-down control circuit is used to control the input terminal of the pull-down control circuit and the fifth node to be in an open circuit state when the motion monitoring signal is at the first level, and to pull the potential of the fifth node down to a preset potential when the motion monitoring signal is at the second level. The output terminal of the hysteresis output circuit is electrically connected to the contactor; the hysteresis output circuit is used to output the short-circuit control signal according to the signal of the fifth node.

[0015] Optionally, the charge / discharge control circuit includes a third diode, a sixth resistor, and a seventh resistor; The anode of the third diode is electrically connected to the output terminal of the edge detection module, and the cathode of the third diode is electrically connected to the fifth node through the sixth resistor; The seventh resistor is electrically connected between the output terminal of the edge detection module and the fifth node.

[0016] Optionally, the pull-down control circuit includes: a fourth diode; The cathode of the fourth diode is electrically connected to the output terminal of the motion monitoring module, and the anode of the fourth diode is electrically connected to the fifth node.

[0017] Optionally, the energy storage circuit includes a third capacitor.

[0018] Optionally, the hysteresis output circuit includes: a second comparator, an eighth resistor, a ninth resistor, and a tenth resistor; The non-inverting input terminal of the second comparator is electrically connected to the first voltage source through the eighth resistor, the non-inverting input terminal of the second comparator is electrically connected to the ground terminal through the ninth resistor, and the non-inverting input terminal of the second comparator is also electrically connected to the output terminal of the second comparator through the tenth resistor; The inverting input of the second comparator is electrically connected to the fifth node, and the output of the second comparator is electrically connected to the contactor.

[0019] Optionally, the signal conversion module further includes: an amplifier circuit; The input terminal of the amplifier circuit is electrically connected to the output terminal of the hysteresis output circuit, and the output terminal of the amplifier circuit is electrically connected to the contactor; the amplifier circuit is used to amplify the short-circuit control signal and output it to the contactor.

[0020] Optionally, the amplifier circuit includes a first transistor, a second transistor, and an eleventh resistor; One end of the eleventh resistor is electrically connected to the output terminal of the hysteresis output circuit, and the other end of the eleventh resistor is electrically connected to the gates of the first transistor and the second transistor. The first terminal of the first transistor is electrically connected to the first power supply terminal, the second terminal of the first transistor and the first terminal of the second transistor are electrically connected to the sixth node, and the second terminal of the second transistor is electrically connected to the ground terminal; the sixth node is also electrically connected to the contactor. The first transistor and the second transistor have different channel types.

[0021] Optionally, the short-circuit testing device for the high-voltage equipment further includes: a status indication module; The status indication module is electrically connected to the output terminal of the action monitoring unit; the status indication unit is used to output the working status of the high-voltage equipment according to the action monitoring signal.

[0022] Optionally, the short-circuit testing device for the high-voltage equipment further includes: a display module; The display module is electrically connected to the counter; the display module is used to display the count value of the counter.

[0023] The short-circuit testing device for high-voltage equipment provided by this invention monitors the output voltage fluctuations through an edge detection module and outputs a corresponding level signal based on the periodic changes of the edge detection signal through an action monitoring module. This detects whether the high-voltage equipment is in a normal periodic restart state, thus enabling automatic sensing of the high-voltage equipment's restart state through the coordinated work of the edge detection module and the action monitoring module. A signal conversion module logically synthesizes the edge detection signal and the action monitoring signal, outputting an enable level to drive the contactor to short-circuit only when both simultaneously meet preset conditions, ensuring the accuracy and safety of the short-circuit action timing. Simultaneously, a counter accumulates the edge detection pulses, achieving automatic accumulation of test counts. The entire short-circuit testing device for high-voltage equipment has a simple structure, requiring no complex multi-instrument coordination, and can automatically complete the "short circuit-restart-re-short circuit" cyclic testing process. The testing process is simple, effectively improving testing results and reducing testing costs, and providing real-time feedback on testing progress, significantly improving the automation level and reliability of high-voltage equipment short-circuit testing.

[0024] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of another short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of another short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of another short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of another short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of another short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] Figure 1 This is a schematic diagram of the structure of a short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the short-circuit testing device 01 for high-voltage equipment includes: an edge detection module 10, an action monitoring module 20, a signal conversion module 30, a counter 40, and a contactor 50. The input terminal of the edge detection module 10 is electrically connected to the detection terminal of the high-voltage equipment 02, and the output terminal of the edge detection module 10 is electrically connected to the input terminal of the action monitoring module 20, the first input terminal IN1 of the signal conversion module 30, and the input terminal of the counter 40. The edge detection module 10 is used to output an edge detection signal based on the output voltage of the high-voltage equipment 02. The output terminal of the action monitoring module 20 is electrically connected to the second input terminal IN2 of the signal conversion module 30, and the action monitoring module 20 is used to output an action monitoring signal based on the edge detection signal. The output terminal of the signal conversion module 30 is electrically connected to the contactor 50. The signal conversion module 30 is used to output a short-circuit control signal to the contactor 50 based on the edge detection signal and the action monitoring signal. The counter 40 is used to count the number of pulses of the edge detection signal.

[0030] Specifically, the input terminal of the edge detection module 10 is electrically connected to the detection terminal of the high-voltage device 02 to acquire the output voltage of the high-voltage device 02 in real time and detect changes in the output voltage. It can generate an edge detection signal reflecting the level transition when the output voltage changes at an edge (e.g., a rising edge transitioning from low to high, or a falling edge transitioning from high to low). The output terminal of the edge detection module 10 is electrically connected to the input terminal of the action monitoring module 20, the first input terminal IN1 of the signal conversion module 30, and the input terminal of the counter 40. This allows the edge detection signal to be transmitted to the action monitoring module 20 and the signal conversion module 30, providing a basis for subsequent triggering of action monitoring and short-circuit control. Furthermore, the edge detection signal can be transmitted to the counter 40 so that the counter 40 can perform corresponding counting actions.

[0031] The output terminal of the action monitoring module 20 is electrically connected to the second input terminal IN2 of the signal conversion module 30. The action monitoring module 20 is configured to receive the edge detection signal from the edge detection module 10 and further output an action monitoring signal based on the signal. In specific operation, the action monitoring module 20 can be understood as a confirmation module for key actions of the high-voltage equipment 02 (such as output establishment, voltage stabilization, restart completion, or continuous restart at a preset cycle, etc.), and its output action monitoring signal represents whether the high-voltage equipment 02 is currently in a steady-state condition suitable for short-circuit testing. In an exemplary embodiment, when the high-voltage equipment 02 can continuously restart at a preset cycle, the edge detection signal output by the edge detection module 10 changes periodically. The action monitoring module 20 outputs a first level (e.g., high level) when the edge detection signal changes periodically, indicating that the high-voltage equipment 02 is in a normal periodic restart state. When the high-voltage equipment 02 cannot restart for a long time due to a fault or protection, the edge detection signal output by the edge detection module 10 stops changing (e.g., remains continuously at a low or high level), and the action monitoring module 20 outputs a first level (e.g., low level) when the edge detection signal stops changing, indicating that the high-voltage equipment 02 has entered an abnormal state. By simultaneously sending the edge detection signal and the action monitoring signal to the signal conversion module 30, it can be ensured that the short-circuit test action is synchronized with the moment the high-voltage equipment 02 completes its restart, thereby improving the repeatability and safety of the test.

[0032] The output terminal of the signal conversion module 30 is electrically connected to the control terminal of the contactor 50. The signal conversion module 30 has a first input terminal IN1 and a second input terminal IN2, used to receive the edge detection signal from the edge detection module 10 and the action monitoring signal from the action monitoring module 20, respectively. The signal conversion module 30 integrates a logic judgment circuit for logically synthesizing the edge detection signal and the action monitoring signal. In an exemplary embodiment, the short-circuit control signal output by the signal conversion module 30 to the contactor 50 is at an enable level only when the edge detection signal and the action monitoring signal simultaneously meet preset conditions (e.g., the edge detection signal indicates the arrival of a voltage rising edge, and the action monitoring signal indicates that the high-voltage equipment 02 is in a periodic restart working state). This enables the main contacts of the contactor 50 to close, thereby short-circuiting the output terminal of the high-voltage equipment 02 through the contactor 50, thus simulating a real short-circuit fault condition. Conversely, when any of the preset conditions are not met, the short-circuit control signal output by the signal conversion module 30 is at an inactive level, the main contacts of the contactor 50 remain open, and the high-voltage equipment 02 operates normally.

[0033] It is understood that contactor 50 can also be electrically connected to the output terminal of high-voltage equipment 02, used to short-circuit the output terminal of high-voltage equipment 02 under the control of a short-circuit control signal. The output terminal and the detection terminal of high-voltage equipment 02 can be the same port, so as to continue monitoring the output voltage of high-voltage equipment 02 after the short circuit is released, thereby ensuring the normal closed-loop control logic of the testing device.

[0034] For example, refer to Figure 1 The detection terminals of high-voltage equipment 02 include a positive detection terminal C+ and a negative detection terminal C-. Taking contactor 50 as a relay as an example, the coil 51 of contactor 50 is electrically connected to the output terminal of the signal conversion module to receive the short-circuit control signal. The first contact m1 and the second contact m2 of contactor 50 are electrically connected to the positive detection terminal C+ and the negative detection terminal C-, respectively. When the short-circuit control signal is at an enable level, the coil 51 is energized, and the first contact m1 and the second contact m2 close, short-circuiting the positive detection terminal C+ and the negative detection terminal C- of high-voltage equipment 02. When the short-circuit control signal is at a non-enable level, the coil 51 is de-energized, and the first contact m2 and the second contact m2 open, releasing the short circuit.

[0035] Furthermore, the input terminal of counter 40 is electrically connected to the output terminal of edge detection module 10. Counter 40 is used to accumulate the number of pulses in the edge detection signal output by edge detection module 10. Since the edge detection signal corresponds one-to-one with the voltage change event of high-voltage device 02, and each time high-voltage device 02 completes a restart (i.e., the output voltage jumps from low level to high level), the edge detection signal generates a valid pulse. Therefore, this count value actually represents the number of restarts that high-voltage device 02 has completed, that is, the number of valid short-circuit test cycles that have been completed. During automated repeated short-circuit testing, the reading of counter 40 can serve as a quantitative indicator of test progress, allowing operators to accurately know the number of short-circuit test cycles that have been completed without relying on an external oscilloscope or manual recording.

[0036] The short-circuit testing device for high-voltage equipment provided in this invention monitors the output voltage fluctuations through an edge detection module and outputs a corresponding level signal based on the periodic changes of the edge detection signal through an action monitoring module. This detects whether the high-voltage equipment is in a normal periodic restart state, thus enabling automatic sensing of the high-voltage equipment's restart state through the coordinated work of the edge detection module and the action monitoring module. A signal conversion module logically synthesizes the edge detection signal and the action monitoring signal, outputting an enable level to drive the contactor to short-circuit only when both simultaneously meet preset conditions, ensuring the accuracy and safety of the short-circuit action timing. Simultaneously, a counter accumulates the edge detection pulses, achieving automatic accumulation of test counts. The entire short-circuit testing device for high-voltage equipment has a simple structure, requiring no complex multi-instrument coordination, and can automatically complete the "short circuit-restart-re-short circuit" cyclic testing process. The testing process is simple, effectively improving testing results and reducing testing costs, and providing real-time feedback on testing progress, significantly improving the automation level and reliability of high-voltage equipment short-circuit testing.

[0037] Optional, Figure 2 This is a schematic diagram of another short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the detection terminals of the high-voltage equipment 02 include a positive detection terminal C+ and a negative detection terminal C-; the edge detection module 10 includes: an edge detection circuit 11, an isolation output circuit 12, and a discharge bypass circuit 13; the first terminal of the edge detection circuit 11 is electrically connected to the positive detection terminal C+, and the second terminal of the edge detection circuit 11 is electrically connected to the first input terminal of the isolation output circuit 12 and the output terminal of the discharge bypass circuit 13 at the first node a1; the second input terminal of the isolation output circuit 12 and the input terminal of the discharge bypass circuit 13 are electrically connected to the negative detection terminal C- at the second node a2; the output terminal of the isolation output circuit 12 is electrically connected to the input terminal of the action monitoring module 20, the first input terminal IN1 of the signal conversion circuit 30, and the input terminal of the counter 40; the edge detection circuit 11... 1 is used to output a first pulse signal through a second terminal when the voltage rise rate of the positive detection terminal C+ exceeds a preset rate, and to output a first voltage signal through a second terminal when the voltage rise rate of the positive detection terminal C+ is lower than or equal to the preset rate; the first voltage signal is lower than a first preset voltage; the isolation output circuit 12 is used to output a first-level edge detection signal when the potential of the first node a1 is higher than the potential of the second node a2, and to output a second-level edge detection signal when the potential of the first node a1 is lower than or equal to the potential of the second node a2; the bypass discharge circuit 13 is used to provide a discharge path when the potential of the first node a1 is lower than the potential of the second node a2, and to remain off when the potential of the first node a1 is higher than or equal to the potential of the second node a2.

[0038] Specifically, the edge detection circuit 11 is used to monitor the voltage change rate at the positive detection terminal C+. When the voltage rise rate at the positive detection terminal C+ exceeds a preset rate (i.e., when a fast rising edge is detected), the edge detection circuit 11 outputs a first pulse signal through its second terminal; when the voltage rise rate at the positive detection terminal C+ is lower than or equal to the preset rate (i.e., the voltage changes slowly or remains stable), the edge detection circuit 11 outputs a first voltage signal through its second terminal. This first voltage signal is lower than a first preset voltage, which can be a voltage close to 0V.

[0039] The isolation output circuit 12 is used to output corresponding edge detection signals based on the potentials of the first node a1 and the second node a2. When the potential of the first node a1 is higher than that of the second node a2, the isolation output circuit 12 outputs a first-level (e.g., high-level) edge detection signal; when the potential of the first node a1 is lower than or equal to that of the second node a2, the isolation output circuit 12 outputs a second-level (e.g., low-level) edge detection signal. Thus, the isolation output circuit 12 can convert the first pulse signal and the first voltage signal output by the edge detection circuit 11 into level signals with clearly defined high and low levels, respectively, facilitating the use of the subsequent action monitoring module 20, signal conversion circuit 30, and counter 40.

[0040] The discharge bypass circuit 13 provides a discharge path when the potential of the first node a1 is lower than that of the second node a2, so as to discharge the charge accumulated inside the edge detection circuit 11, reset the edge detection circuit 11, and enable it to respond again when the next voltage jump occurs; when the potential of the first node a1 is higher than or equal to the potential of the second node a2, the discharge bypass circuit 13 remains in the off state and does not affect the normal operation of the circuit.

[0041] Optional, Figure 3 This is a schematic diagram of the structure of another short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the edge detection circuit 11 includes a first capacitor C1 and a first resistor R1; the first capacitor C1 and the first resistor R1 are connected in series between the positive detection terminal C+ and the first node a1.

[0042] Specifically, the first capacitor C1 and the first resistor R1 constitute a first-order RC differentiating circuit. When the voltage at the positive detection terminal C+ experiences a rapid rising edge change (i.e., the voltage rise rate exceeds a preset rate), since the voltage across the capacitor cannot change abruptly, the first capacitor C1 couples the voltage change to the first resistor R1, generating a positive spike pulse at the first node a1. The amplitude of this pulse is proportional to the voltage change rate; this is the first pulse signal. When the voltage at the positive detection terminal C+ changes slowly or remains constant, the differentiating circuit outputs a first voltage signal close to zero (i.e., the potential of the first node a1 is close to the potential of the negative detection terminal C-, typically ground potential). By appropriately selecting the capacitance value of the first capacitor C1 and the resistance value of the first resistor R1, a preset rate threshold can be set, ensuring that an effective first pulse signal is generated only when the steepness of the voltage rise edge is sufficient to simulate the output voltage build-up speed during the actual restart of high-voltage equipment, thereby filtering out slow voltage drift or noise interference.

[0043] Optional, see reference Figure 3 The isolated output circuit 12 includes a first optocoupler 121 and a second resistor R2; the first optocoupler 121 includes a light-emitting diode D0 and a phototransistor T0; the anode of the light-emitting diode D0 is electrically connected to the first node a1, and the cathode of the light-emitting diode D0 is electrically connected to the second node a2; the first terminal of the phototransistor T0 is electrically connected to the first power supply terminal VCC1, and the second terminal of the phototransistor T0 is electrically connected to the first terminal of the second resistor R2 at the third node a3; the second terminal of the second resistor R2 is electrically connected to the ground terminal GND; the third node a3 is also electrically connected to the input terminal of the motion monitoring module 20, the first input terminal IN1 of the signal conversion module 30, and the input terminal of the counter 40.

[0044] Specifically, when the potential of the first node a1 is higher than the potential of the second node a2, the LED D0 is forward-biased and emits light, driving the phototransistor T0 to conduct. At this time, the current supplied by the first power supply terminal VCC1 flows through the phototransistor T0 and the second resistor R2 to the ground terminal GND, generating a high-level signal at the third node a3, i.e., the edge detection signal is the first level (high level). When the potential of the first node a1 is lower than or equal to the potential of the second node a2, the LED D0 is reverse-biased or cannot conduct, the phototransistor T0 is turned off, and the third node a3 is pulled down to the potential of the ground terminal GND through the second resistor R2, outputting a low-level signal, i.e., the edge detection signal is the second level (low level). By setting the second resistor R2, not only can the output current when the phototransistor T0 is conducting be limited, but a clear pull-down level can also be provided when the phototransistor T0 is turned off, avoiding the output terminal being floating. The circuit utilizes the first optocoupler OPT1 to achieve electrical isolation between the high-voltage side and the low-voltage control side, effectively protecting the subsequent action monitoring module 20, signal conversion module 30, and counter 40 from high-voltage impacts, while ensuring accurate transmission of edge detection signals.

[0045] Optional, continue to refer to Figure 3 The bypass discharge circuit 13 includes: a first diode D1; the anode of the first diode D1 is electrically connected to the second node a2, and the cathode of the first diode D1 is electrically connected to the first node a1.

[0046] Specifically, when the potential of the first node a1 is lower than the potential of the second node a2, the first diode D1 is forward-biased, providing a low-impedance discharge path from the second node a2 through the first diode D1 to the first node a1. At this time, the charge accumulated on the first capacitor C1 in the edge detection circuit 11 can be quickly discharged through the loop formed by the first resistor R1, the first node a1, the first diode D1, and the second node a2, causing the potential of the first node a1 to quickly rise back to be equal to the potential of the second node a2, thereby completing the automatic reset of the edge detection circuit 11 and preparing for the detection of the next voltage rising edge. When the potential of the first node a1 is higher than or equal to the potential of the second node a2, the first diode D1 is reverse-biased and does not affect the normal differential operation of the edge detection circuit 11. By setting the first diode D1 as the bypass discharge circuit 13, not only is the structure simple and the cost low, but it can also ensure that the residual charge on the first capacitor C1 is quickly cleared after each voltage jump, avoiding the decrease in detection sensitivity or false triggering due to charge accumulation, and ensuring the stability and consistency of the edge detection module 10 in long-term repeated short-circuit tests.

[0047] Optional, see reference Figure 2The motion monitoring module 20 includes: a unidirectional transmission circuit 21, a pulse holding circuit 22, and a motion monitoring circuit 23; the input terminal of the unidirectional transmission circuit 21 is electrically connected to the output terminal of the edge detection module 10, and the output terminal of the unidirectional transmission circuit 21 is electrically connected to the input terminal of the motion monitoring circuit 23 at the fourth node a4; the unidirectional transmission circuit 21 is used to unidirectionally transmit the edge detection signal to the motion monitoring circuit 23; the first terminal of the pulse holding circuit 22 is electrically connected to the fourth node a4, and the second terminal of the pulse holding circuit 22 is electrically connected to the ground terminal GND; the pulse holding circuit 22 is used to control the fourth node a4 to maintain the first level when the edge detection signal periodically outputs the first level, and to control the fourth node a4 to switch to the second level when the time for the edge detection signal to stop outputting the first level exceeds a first preset time; the output terminal of the motion monitoring circuit 23 is electrically connected to the second input terminal IN2 of the signal conversion module 30; the motion monitoring circuit 23 is used to output a motion monitoring signal according to the signal of the fourth node a4.

[0048] Specifically, the input terminal of the unidirectional transmission circuit 21 is electrically connected to the output terminal of the edge detection module 10, and the output terminal of the unidirectional transmission circuit 21 is electrically connected to the input terminal of the motion monitoring circuit 23 at the fourth node a4. This allows the unidirectional transmission circuit 21 to transmit the edge detection signal unidirectionally to the motion monitoring circuit 23, while preventing the signal at the fourth node a4 from affecting the output terminal of the edge detection module 10 in the reverse direction. In other words, it prevents the signal at the fourth node a4 from affecting the potential of the third node a3 in the edge detection module 10 in the reverse direction, thus ensuring the single direction of signal flow and electrical isolation between the front and rear stages.

[0049] The first terminal of the pulse holding circuit 22 is electrically connected to the fourth node a4, and the second terminal is electrically connected to the ground terminal GND. The pulse holding circuit 22 monitors the output state of the edge detection signal. When the edge detection signal continuously outputs a first level in a periodic manner, the pulse holding circuit 22 controls the fourth node a4 to stably maintain the first level. When the duration for which the edge detection signal stops outputting the first level exceeds a first preset time, the pulse holding circuit 22 controls the fourth node a4 to switch to the second level. Therefore, the pulse holding circuit 22 can accurately distinguish whether the high-voltage equipment 02 is in a normal periodic restart state (manifested as the edge detection signal continuously displaying the first pulse signal) or an abnormal stagnation state (manifested as the edge detection signal maintaining the first voltage signal for a long time).

[0050] The input terminal of the motion monitoring circuit 23 is connected to the fourth node a4, and the output terminal is electrically connected to the second input terminal IN2 of the signal conversion module 30. The motion monitoring circuit 23 is used to acquire the current level of the fourth node a4 and convert it into a motion monitoring signal that meets the requirements of the subsequent interface. For example, the motion monitoring circuit 23 can also perform waveform shaping or level conversion on the signal of the fourth node a4 to eliminate possible jitter and improve signal stability and anti-interference ability.

[0051] In this embodiment of the invention, through the coordinated operation of the unidirectional transmission circuit, the pulse holding circuit, and the action monitoring circuit, the action monitoring module achieves automatic identification of the periodic characteristics of the edge detection signal. When the high-voltage equipment is repeatedly restarted normally, it outputs a first-level action monitoring signal, and when the equipment cannot be restarted for a long time due to fault or protection, it outputs a second-level action monitoring signal, thereby providing a reliable status basis for the signal conversion module and ensuring that the short-circuit action is only performed after the equipment is in a normal periodic restart.

[0052] Optional, see reference Figure 3 The unidirectional transmission circuit 21 includes: a second diode D2; the anode of the second diode D2 is electrically connected to the output terminal of the edge detection module 10, and the cathode of the second diode D2 is electrically connected to the fourth node a4.

[0053] Specifically, utilizing the unidirectional conductivity of a diode, the second diode D2 allows the edge detection signal to be transmitted forward from the edge detection module 10 to the fourth node a4, while simultaneously blocking any signal on the fourth node a4 from flowing back to the output of the edge detection module 10. Specifically, when the edge detection signal output by the edge detection module 10 is a high level (first level), the anode potential of the second diode D2 is higher than the cathode potential, and the second diode D2 is forward-biased, transmitting the high level of the edge detection signal to the fourth node a4, causing the potential of the fourth node a4 to be rapidly pulled up to the first level. When the edge detection signal output by the edge detection module 10 is a low level (second level), the anode potential of the second diode D2 is lower than or equal to the cathode potential, and the second diode D2 is reverse-biased. At this time, the fourth node a4 is isolated from the output of the edge detection module 10, and the potential of the fourth node a4 is independently maintained by the pulse holding circuit 22, without affecting the edge detection module 10 in reverse. By utilizing the unidirectional conductivity of the second diode D2, the edge detection signal is transmitted unidirectionally from the edge detection module 10 to the action monitoring circuit 23. At the same time, it effectively blocks the backflow of the charge stored in the pulse holding circuit 22 at the fourth node a4 to the edge detection module 10, ensuring signal isolation and operational stability between the front and rear circuits.

[0054] For example, a twelfth resistor R12 may be provided between the second resistor R2 and the fourth node a4 for current limiting.

[0055] Optional, continue to refer to Figure 3 The pulse holding circuit 22 includes: a second capacitor C2 and a third resistor R3; the second capacitor C2 and the third resistor R3 are connected in parallel between the fourth node and the ground terminal GND.

[0056] Specifically, when the edge detection signal periodically outputs a high-level first level, each high-level pulse charges the second capacitor C2 via the unidirectional transmission circuit 21, causing the potential of the fourth node a4 to rise rapidly and remain at the first level. During the interval between two pulses, the second capacitor C2 slowly discharges through the third resistor R3. If the next high-level pulse arrives before the voltage of the second capacitor C2 drops to the low-level threshold, the potential of the fourth node a4 is pulled up again, thus maintaining the first level. When the time for the edge detection signal to stop outputting the first level exceeds the first preset time (i.e., the RC discharge time constant) jointly determined by the second capacitor C2 and the third resistor R3, the voltage on the second capacitor C2 will drop below the low-level threshold, at which point the potential of the fourth node a4 switches from the first level to the second level. By reasonably selecting the capacitance value of the second capacitor C2 and the resistance value of the third resistor R3, the first preset time can be precisely set to accurately distinguish between the periodic restart state and the abnormal stagnation state of the high-voltage equipment.

[0057] Optional, continue to refer to Figure 3 The action monitoring circuit 23 includes: a comparator U1, a fourth resistor R4 and a fifth resistor R5; the non-inverting input terminal "+" of the comparator U1 is electrically connected to the fourth node a4, the inverting input terminal "-" of the comparator U1 is electrically connected to the first voltage source VCC1 through the fourth resistor R4, and the inverting input terminal of the comparator U1 is electrically connected to the ground terminal GND through the fifth resistor R5.

[0058] Specifically, the non-inverting input "+" of comparator U1 is electrically connected to the fourth node a4 to receive the voltage signal output by the pulse holding circuit 22. The inverting input "-" of comparator U1 is electrically connected to the first voltage source VCC1 through the fourth resistor R4, and to the ground terminal GND through the fifth resistor R5. This makes the fourth resistor R4 and the fifth resistor R5 form a series voltage divider circuit, generating a stable reference voltage between the first voltage source VCC1 and the ground terminal GND. This reference voltage is applied to the inverting input "-" of comparator U1. Comparator U1 compares the voltage at the non-inverting input "+" (i.e., the voltage at the fourth node a4) with the reference voltage at the inverting input "-": when the voltage at the fourth node a4 is higher than the reference voltage, comparator U1 outputs a high-level operation monitoring signal; when the voltage at the fourth node a4 is lower than the reference voltage, comparator U1 outputs a low-level operation monitoring signal. By adjusting the resistance ratio of the fourth resistor R4 and the fifth resistor R5, the threshold of the reference voltage can be precisely set so that it is between the first level and the second level maintained by the pulse holding circuit 22. This ensures that the comparator U1 can accurately determine the level state of the fourth node a4 and output a digital level signal with steep edges and sufficient noise margin. This gives the motion monitoring circuit 20 advantages such as fast response speed, strong output drive capability, and precise threshold adjustment, and can provide a stable and reliable motion monitoring signal for the subsequent signal conversion module 30.

[0059] Optional, see reference Figure 2 The signal conversion module 30 includes: a charge / discharge control circuit 31, a pull-down control circuit 32, an energy storage circuit 33, and a hysteresis output circuit 34. The first terminal of the charge / discharge control circuit 31 is electrically connected to the output terminal of the edge detection module 10, and the second terminal of the charge / discharge control circuit 31 is electrically connected to the input terminal of the hysteresis output circuit 34 at the fifth node a5. The energy storage circuit 33 is electrically connected between the fifth node a5 and the ground terminal GND. The charge / discharge control circuit 31 is used to charge the energy storage circuit 33 when the edge detection signal is at the first level, and to charge the energy storage circuit when the edge detection signal is at the second level. 33 discharges; the input terminal of the pull-down control circuit 32 is electrically connected to the output terminal of the action monitoring module 20, and the output terminal of the pull-down control circuit 32 is electrically connected to the fifth node a5; the pull-down control circuit a5 is used to control the input terminal of the pull-down control circuit 32 and the fifth node a5 to be in an open circuit state when the action monitoring signal is at the first level, and to pull the potential of the fifth node a5 down to the preset potential when the action monitoring signal is at the second level; the output terminal of the hysteresis output circuit 34 is electrically connected to the contactor 50; the hysteresis output circuit 34 is used to output a short-circuit control signal according to the signal of the fifth node a5.

[0060] Specifically, by electrically connecting the charge / discharge control circuit 31 between the output terminal of the edge detection module 10 and the fifth node a5, and electrically connecting the energy storage circuit 33 between the fifth node a5 and the ground terminal GND, the charge / discharge control circuit 31 can control the charge / discharge of the energy storage circuit 33 according to the level of the edge detection signal. When the edge detection signal is at the first level (e.g., high level), the charge / discharge control circuit 31 charges the energy storage circuit 33, causing the potential of the fifth node a5 to rise; when the edge detection signal is at the second level (e.g., low level), the charge / discharge control circuit 31 discharges the energy storage circuit 33, causing the potential of the fifth node a5 to drop.

[0061] By electrically connecting the pull-down control circuit 32 between the output of the action monitoring module 20 and the fifth node a5, the pull-down control circuit 32 can determine whether to pull down the potential of the fifth node a5 based on the level of the action monitoring signal. When the action monitoring signal is at the first level (indicating that the high-voltage equipment 02 is in a normal periodic restart state), the input of the pull-down control circuit 32 is in an open circuit state with the fifth node a5, and does not interfere with the potential change of the fifth node a5; when the action monitoring signal is at the second level (indicating that the high-voltage equipment 02 has entered an abnormal stagnation state), the pull-down control circuit 32 forcibly pulls down the potential of the fifth node a5 to a preset potential (e.g., ground potential), thereby shielding the charging and discharging effect of the charging and discharging control circuit 31 on the energy storage circuit 33.

[0062] By electrically connecting the hysteresis output circuit 34 between the fifth node a5 and the contactor 50, the hysteresis output circuit 34 can monitor the potential of the fifth node a5 and output a short-circuit control signal according to the potential of the fifth node a5. The hysteresis output circuit 34 has hysteresis characteristics, that is, when the potential of the fifth node a5 rises above the first threshold, it outputs an enable level (driving the contactor 50 to close), and when the potential of the fifth node a5 drops below the second threshold (the second threshold is less than the first threshold), it outputs a de-enabled level (causing the contactor 50 to open), thereby avoiding frequent switching bounce at the threshold boundary.

[0063] For example, using the above circuit setup, during the normal periodic restart of the high-voltage equipment 02, the action monitoring signal remains at the first level, and the pull-down control circuit 32 remains open. At this time, each high-level pulse of the edge detection signal charges the energy storage circuit 33 through the charge / discharge control circuit 31. When multiple consecutive high-level pulses accumulate and charge the potential of the fifth node a5 to exceed the first threshold, the hysteresis output circuit 34 outputs an enable level, driving the contactor 50 to perform a short-circuit action. After the short circuit occurs, the output voltage of the high-voltage equipment 02 drops, the edge detection signal becomes low, and the charge / discharge control circuit 31 switches to discharging the energy storage circuit 33. When the high-voltage equipment 02 completes the restart and the output voltage is re-established, the edge detection signal outputs a high-level pulse again, charging the energy storage circuit 33 again, and so on in a cycle. If the high-voltage equipment 02 cannot be restarted for a long time due to a fault, the action monitoring signal switches to the second level, the pull-down control circuit 32 forcibly pulls the potential of the fifth node a5 low, the hysteresis output circuit 34 outputs an inactive level, and the contactor 50 remains open, thereby ensuring that the short-circuit action only occurs when the equipment is continuously and periodically restarted.

[0064] Optional, see reference Figure 3 The charge / discharge control circuit 31 includes a third diode D3, a sixth resistor R6, and a seventh resistor R7. The anode of the third diode D3 is electrically connected to the output terminal of the edge detection module 10, and the cathode of the third diode D3 is electrically connected to the fifth node a5 through the sixth resistor R6. The seventh resistor R7 is electrically connected between the output terminal of the edge detection module 10 and the fifth node a5.

[0065] Specifically, through the above circuit setup, the charge / discharge control circuit 31 utilizes the unidirectional conductivity of the third diode D3 and the resistance difference between the sixth resistor R6 and the seventh resistor R7 to achieve asymmetrical charge / discharge control of the energy storage circuit 33. Specifically, when the edge detection signal is at a high level (first level), the third diode D3 is forward-biased, and the output of the edge detection module 10 provides charging current to the fifth node a5 via the third diode D3 and the sixth resistor R6. Simultaneously, the seventh resistor R7 also provides a parallel charging path. At this time, the total resistance of the charging circuit is relatively small (the sixth resistor R6 and the seventh resistor R7 are connected in parallel, and the diode's on-resistance is negligible), and the energy storage circuit 33 is rapidly charged, causing the potential of the fifth node a5 to rise rapidly to above the first threshold of the hysteresis output circuit 34 in a very short time. Therefore, during the duration of each high-level pulse of the edge detection signal, the hysteresis output circuit 34 outputs an enable level (driving the contactor 50 to close), performing a short-circuit operation.

[0066] When the edge detection signal becomes the second low level, the third diode D3 is reverse-biased and cut off. At this time, the fifth node a5 is connected to the output terminal of the edge detection module 10 only through the seventh resistor R7. Since the edge detection module 10 outputs a low level (close to ground potential), the charge stored in the energy storage circuit 33 is discharged to the output terminal of the edge detection module 10 through the seventh resistor R7, and then through the third node a3 and the second resistor R2 in the edge detection module 10 to the ground terminal GND to form a discharge circuit. By reasonably selecting the resistance values ​​of the sixth resistor R6 and the seventh resistor R7 (for example, making the sixth resistor R6 much smaller than the seventh resistor R7), the charging time constant is much smaller than the discharging time constant. Thus, within the high-level pulse width of the edge detection signal (usually in the microsecond to millisecond range), the fifth node a5 can be quickly charged to above the first threshold; while during the pulse interval (i.e., within the restart cycle of the high-voltage equipment 02, usually in the second range), due to the large resistance of the discharge circuit (only the seventh resistor R7), the potential of the fifth node a5 can slowly decrease, but it will inevitably decrease to below the second threshold of the hysteresis output circuit 34 before the next high-level pulse arrives. By reasonably selecting the seventh resistor R7 and the second capacitor C2, the discharge time determined by the two is less than the restart cycle of the high-voltage equipment 02. This ensures that the potential of the fifth node a5 is fully discharged below the second threshold in each cycle, thereby reliably restoring the short-circuit control signal to the non-enable level after the pulse of each edge detection signal ends.

[0067] In this embodiment of the invention, the charge and discharge control circuit can achieve the function of "single-pulse fast triggering and reliable reset within the cycle" using only one diode and two resistors. The circuit structure is simple and the response speed is fast. It can ensure that a short-circuit control signal is output immediately when each voltage rising edge arrives, and automatically resets after the pulse ends to prepare for the next cycle.

[0068] Optional, see reference Figure 3 The pull-down control circuit 32 includes: a fourth diode D4; the cathode of the fourth diode D4 is electrically connected to the output terminal of the action monitoring module 20, and the anode of the fourth diode D4 is electrically connected to the fifth node a5.

[0069] Specifically, through the above circuit setup, the pull-down control circuit 32 utilizes the unidirectional conductivity of the fourth diode D4 to determine whether to pull down the potential of the fifth node a5 based on the level of the action monitoring signal. Specifically, when the action monitoring signal is at the first high level (indicating that the high-voltage equipment 02 is in a normal periodic restart state), the anode potential of the fourth diode D4 is lower than the cathode potential, and the fourth diode D4 is reverse-biased and cut off. At this time, the input terminal of the pull-down control circuit 32 is in an open-circuit state with the fifth node a5, and the action monitoring signal does not interfere with the potential change of the fifth node a5. The charging and discharging control circuit 31 then normally performs the charging and discharging function of the energy storage circuit 33. When the action monitoring signal is at the second low level (indicating that the high-voltage equipment 02 has entered an abnormal standstill state), the anode potential of the fourth diode D4 is higher than or equal to the cathode potential, and the fourth diode D4 is forward-biased, forcibly pulling the potential of the fifth node a5 down to the low level of the output terminal of the action monitoring module 20 (i.e., the second level, close to the ground potential). This shields the charging and discharging control circuit 31 from the charging and discharging effect on the energy storage circuit 33, preventing the fifth node a5 from establishing a high potential sufficient to trigger the hysteresis output circuit 34, and keeping the contactor 50 in the open state. This circuit achieves a rapid response to abnormal states using a single diode, has an extremely simple structure, is inexpensive, and does not affect the establishment of the potential of the fifth node a5 during normal periodic restarts.

[0070] Optional, continue to refer to Figure 3 The energy storage circuit 33 includes: a third capacitor C3.

[0071] Specifically, the third capacitor C3 is electrically connected between the fifth node a5 and the ground terminal GND. As an energy storage element, the third capacitor C3 stores the charge of the fifth node a5, maintaining its potential. When the charge / discharge control circuit 31 charges the energy storage circuit 33, the voltage across the third capacitor C3 gradually increases, and the potential of the fifth node a5 rises accordingly. When the charge / discharge control circuit 31 discharges the energy storage circuit 33, the third capacitor C3 releases its charge through the discharge circuit, and the potential of the fifth node a5 gradually decreases. The capacitance value of the third capacitor C3 directly determines the charging and discharging time constants: a larger capacitance value results in a slower potential change and stronger anti-interference capability; a smaller capacitance value results in a faster response speed. In practical design, the capacitance value of the third capacitor C3 can be reasonably selected based on the restart cycle of the high-voltage equipment 02 and the pulse width of the edge detection signal to ensure that the potential of the fifth node a5 can be quickly charged to above the first threshold of the hysteresis output circuit 34 during the high-level pulse of each edge detection signal, while reliably discharging to below the second threshold during the pulse interval, thereby achieving cycle-by-cycle synchronous short-circuit control. The energy storage circuit 33 uses only a single capacitor, has a very simple structure, low cost, and high reliability.

[0072] Optional, continue to refer to Figure 3 The hysteresis output circuit 34 includes: a second comparator U2, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10; the non-inverting input terminal "+" of the second comparator U2 is electrically connected to the first voltage source VCC1 through the eighth resistor R8, the non-inverting input terminal "+" of the second comparator U2 is electrically connected to the ground terminal GND through the ninth resistor R9, and the non-inverting input terminal "+" of the second comparator U2 is also electrically connected to the output terminal of the second comparator U2 through the tenth resistor R10; the inverting input terminal "-" of the second comparator U2 is electrically connected to the fifth node a5, and the output terminal of the second comparator U2 is electrically connected to the contactor 50.

[0073] Specifically, through the circuit setup described above, the eighth resistor R8 and the ninth resistor R9 form a voltage divider network, generating a reference voltage between the first voltage source VCC1 and ground, which is applied to the non-inverting input "+" of the second comparator U2. The tenth resistor R10 is connected between the output of the second comparator U2 and the non-inverting input "+", forming a positive feedback loop, giving the second comparator U2 a hysteresis characteristic. Specifically, when the potential of the fifth node a5 (connected to the inverting input "-") is higher than the reference voltage of the non-inverting input "+", the second comparator U2 outputs a low level, which is the enable level, driving the contactor 50 to close and perform a short-circuit operation; when the potential of the fifth node a5 is lower than the reference voltage of the non-inverting input "+", the second comparator U2 outputs a high level, which is the disable level, driving the contactor 50 to open. The tenth resistor R10 is connected between the output of the second comparator U2 and the non-inverting input "+", forming a positive feedback loop, giving the second comparator U2 a hysteresis characteristic. Due to the feedback effect of the tenth resistor R10, the equivalent reference voltage of the second comparator U2 changes with the output state. When the second comparator U2 outputs a high level, the voltage at the non-inverting input "+" is raised to a higher first threshold through the feedback of the tenth resistor R10; when the second comparator U2 outputs a low level, the voltage at the non-inverting input "+" is pulled down to a lower second threshold through the feedback of the tenth resistor R10. Therefore, the first threshold is higher than the second threshold, so the first threshold (higher value) is used to trigger a short circuit, and the second threshold (lower value) is used to release the short circuit, forming a hysteresis loop of triggering first and then releasing. This hysteresis characteristic ensures that when the potential of the fifth node a5 fluctuates near the threshold, the output will not frequently jump, thus avoiding repeated bouncing of the contactor 50. By appropriately selecting the resistance ratios of the eighth resistor R8, the ninth resistor R9, and the tenth resistor R10, the values ​​of the first and second thresholds can be precisely set to match the charging and discharging characteristics of the charging and discharging control circuit 31 for the fifth node a5. This ensures that the potential of the fifth node a5 reliably exceeds the first threshold during the high-level pulse of each edge detection signal (at which point the output is low, triggering a short circuit); and that the potential of the fifth node a5 reliably drops below the second threshold during the pulse interval (at which point the output is high, releasing the short circuit). This hysteresis output circuit 34 has a simple structure and rapid response, providing a clean and stable drive signal for the contactor 50.

[0074] Optional, Figure 4 This is a schematic diagram of the structure of another short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the signal conversion module 30 also includes: an amplifier circuit 35; the input terminal of the amplifier circuit 35 is electrically connected to the output terminal of the hysteresis output circuit 34, and the output terminal of the amplifier circuit 35 is electrically connected to the contactor 50; the amplifier circuit 35 is used to amplify the short-circuit control signal and output it to the contactor 50.

[0075] Specifically, by electrically connecting the amplifier circuit 35 between the output terminal of the hysteresis output circuit 34 and the contactor 50, the amplifier circuit 35 amplifies the short-circuit control signal output by the hysteresis output circuit 34 to provide sufficient drive current or voltage, ensuring that the coil of the contactor 50 can reliably engage or disengage. By setting up the amplifier circuit 35, the driving capability of the short-circuit control signal can be effectively improved, meeting the driving requirements of different types of contactors and enhancing the versatility and stability of the entire testing device.

[0076] Optional, Figure 5 This is a schematic diagram of the structure of another short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the amplifier circuit 35 includes a first transistor T1, a second transistor T2, and an eleventh resistor R11; one end of the eleventh resistor R11 is electrically connected to the output terminal of the hysteresis output circuit 34, and the other end of the eleventh resistor R11 is electrically connected to the gates of the first transistor T1 and the second transistor T2; the first electrode of the first transistor T1 is electrically connected to the first power supply terminal VCC1, the second electrode of the first transistor T1 and the first electrode of the second transistor T2 are electrically connected to the sixth node a6, and the second electrode of the second transistor T2 is electrically connected to the ground terminal GND; the sixth node a6 is also electrically connected to the contactor 50; the first transistor T1 and the second transistor T2 have different channel types.

[0077] Specifically, through the circuit setup described above, the first transistor T1 and the second transistor T2 form a complementary push-pull amplifier circuit. The eleventh resistor R11 acts as an input current-limiting resistor, coupling the short-circuit control signal output from the hysteresis output circuit 34 to the gates of the two transistors. Since the first transistor T1 and the second transistor T2 have different channel types (e.g., the first transistor T1 is an N-channel MOSFET, and the second transistor T2 is a P-channel MOSFET), when the short-circuit control signal is high, the first transistor T1 is turned on and the second transistor T2 is turned off, pulling the potential of the sixth node a6 to the potential of the first power supply terminal VCC1; when the short-circuit control signal is low, the first transistor T1 is turned off and the second transistor T2 is turned on, pulling the potential of the sixth node a6 to the ground potential. Through this alternating conduction mode, the amplifier circuit 35 can output a level signal with the same logic as the short-circuit control signal but with stronger driving capability, driving the coil of the contactor 50 to engage or disengage. This push-pull amplifier circuit has advantages such as low output impedance, fast switching speed, and low static power consumption. It can ensure that the contactor 50 receives sufficient drive current, while avoiding large voltage drops when a single transistor is turned on, thus improving the efficiency and reliability of the overall circuit.

[0078] Optional, Figure 6This is a schematic diagram of the structure of another short-circuit testing device for high-voltage equipment provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the short-circuit testing device 01 for high-voltage equipment also includes: a status indication module 60; the status indication module 60 is electrically connected to the output terminal of the action monitoring unit 20; the status indication unit 60 is used to output the working status of the high-voltage equipment 02 according to the action monitoring signal.

[0079] Specifically, the status indication module 60 can convert the action monitoring signal output by the action monitoring module 20 into intuitive visual or auditory prompts, facilitating operators to understand the current operating status of the high-voltage equipment 02 in real time. Specifically, when the action monitoring signal is at the first level (indicating that the high-voltage equipment 02 is in a normal periodic restart state), the status indication module 60 outputs a first status indication (e.g., a solid green light or the word "normal"); when the action monitoring signal is at the second level (indicating that the high-voltage equipment 02 has entered an abnormal standstill state), the status indication module 60 outputs a second status indication (e.g., a flashing red light or the word "fault"). This status indication module 60 can include components such as LED indicators, digital tube displays, or buzzers, implemented through simple level conversion or drive circuits. By setting up the status indication module 60, operators can intuitively judge the working status of the high-voltage equipment 02 without the need for external instruments such as oscilloscopes, significantly improving the convenience of the testing process and the user-friendliness of human-machine interaction.

[0080] Optional, see reference Figure 6 The short-circuit testing device 01 for high-voltage equipment also includes: a display module 70; the display module 70 is electrically connected to the counter 40; the display module 70 is used to display the counting value of the counter 40.

[0081] Specifically, the display module 70 can visually display the number of edge detection signal pulses accumulated by the counter 40 in digital form. Operators can observe the readings on the display module 70 to know in real time the number of valid short-circuit test cycles completed, without the need for an external oscilloscope or manual recording, thus accurately monitoring the test progress. The display module 70 can use conventional display devices such as digital tubes, LCD screens, or segment displays, and is connected to the output of the counter 40 via a parallel or serial interface to convert the count value into visual digital information. The inclusion of this display module 70 further enhances the human-machine interface and ease of use of the testing device.

[0082] For example, counter 40 can be implemented by circuitry or by a chip. Specifically, counter 40 can be built using discrete digital circuitry, such as a binary or decimal counter composed of multiple cascaded flip-flops, with hardware logic used to accumulate and count the edge detection signal pulses. Alternatively, commercially available integrated counting chips, such as CD4026, CD4518, and 74HC393, can be directly selected. These chips integrate complete counting logic and decoding driver circuitry, and can be directly connected to the interface of display module 70. Furthermore, counter 40 can also be implemented using a microcontroller (MCU) or programmable logic device (CPLD) with counting functionality, allowing for flexible configuration of the number of counting bits, clearing method, and preset values ​​through software programming. Regardless of the implementation method, the core function of counter 40 is to accumulate the number of edge detection signal pulses and output the count value to display module 70 for reading. Any of the above implementation methods can be flexibly selected based on the cost, accuracy, and integration requirements of the actual application scenario. This configuration enriches the design flexibility of the short-circuit test device, facilitating selection and customization according to specific needs.

[0083] In this embodiment of the invention, the signal conversion module implements the confirmation logic for multiple consecutive valid edges through charge-discharge accumulation and hysteresis comparison. This ensures that a short-circuit control signal is only output after the edge detection signal has appeared a sufficient number of times (i.e., the device has completed multiple reliable restarts). This avoids false triggering caused by a single accidental interference and further improves the reliability and safety of the test.

[0084] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A short-circuit testing device for high-voltage equipment, characterized in that, include: Edge detection module, motion monitoring module, signal conversion module, counter and contactor; The input terminal of the edge detection module is electrically connected to the detection terminal of the high-voltage equipment, and the output terminal of the edge detection module is electrically connected to the input terminal of the action monitoring module, the first input terminal of the signal conversion module, and the input terminal of the counter. The edge detection module is used to output an edge detection signal based on the output voltage of the high-voltage equipment. The output terminal of the motion monitoring module is electrically connected to the second input terminal of the signal conversion module, and the motion monitoring module is used to output a motion monitoring signal according to the edge detection signal; The output terminal of the signal conversion module is electrically connected to the contactor; the signal conversion module is used to output a short-circuit control signal to the contactor according to the edge detection signal and the action monitoring signal. The counter is used to count the number of pulses of the edge detection signal.

2. The short-circuit testing device for high-voltage equipment according to claim 1, characterized in that, The detection terminals of the high-voltage equipment include a positive detection terminal and a negative detection terminal; the edge detection module includes: an edge detection circuit, an isolation output circuit, and a discharge bypass circuit; The first terminal of the edge detection circuit is electrically connected to the positive detection terminal, and the second terminal of the edge detection circuit is electrically connected to the first input terminal of the isolation output circuit and the output terminal of the discharge bypass circuit at the first node. The second input terminal of the isolation output circuit and the input terminal of the discharge bypass circuit are electrically connected to the negative detection terminal at the second node; the output terminal of the isolation output circuit is electrically connected to the input terminal of the action monitoring module, the first input terminal of the signal conversion circuit, and the input terminal of the counter. The edge detection circuit is used to output a first pulse signal through the second terminal when the voltage rise rate at the positive detection terminal exceeds a preset rate, and to output a first voltage signal through the second terminal when the voltage rise rate at the positive detection terminal is lower than or equal to the preset rate; the first voltage signal is lower than a first preset voltage. The isolated output circuit is used to output the edge detection signal at a first level when the potential of the first node is higher than the potential of the second node, and to output the edge detection signal at a second level when the potential of the first node is lower than or equal to the potential of the second node. The bypass discharge circuit is used to provide a discharge path when the potential of the first node is lower than the potential of the second node, and to remain off when the potential of the first node is higher than or equal to the potential of the second node.

3. The short-circuit testing device for high-voltage equipment according to claim 2, characterized in that, The edge detection circuit includes a first capacitor and a first resistor; The first capacitor and the first resistor are connected in series between the positive detection terminal and the first node.

4. The short-circuit testing device for high-voltage equipment according to claim 2, characterized in that, The isolated output circuit includes a first optocoupler and a second resistor; The first optocoupler includes a light-emitting diode (LED) and a phototransistor; the anode of the LED is electrically connected to the first node, and the cathode of the LED is electrically connected to the second node; the first terminal of the phototransistor is electrically connected to the first power supply terminal, the second terminal of the phototransistor is electrically connected to the first terminal of the second resistor at the third node, and the second terminal of the second resistor is electrically connected to the ground terminal. The third node is also electrically connected to the input terminal of the motion monitoring module, the first input terminal of the signal conversion module, and the input terminal of the counter.

5. The short-circuit testing device for high-voltage equipment according to claim 1, characterized in that, The motion monitoring module includes: a one-way transmission circuit, a pulse holding circuit, and a motion monitoring circuit; The input terminal of the unidirectional transmission circuit is electrically connected to the output terminal of the edge detection module, and the output terminal of the unidirectional transmission circuit is electrically connected to the input terminal of the motion monitoring circuit at the fourth node; the unidirectional transmission circuit is used to unidirectionally transmit the edge detection signal to the motion monitoring circuit. The first terminal of the pulse hold circuit is electrically connected to the fourth node, and the second terminal of the pulse hold circuit is electrically connected to the ground terminal; the pulse hold circuit is used to control the fourth node to maintain the first level when the edge detection signal periodically outputs the first level, and to control the fourth node to switch to the second level when the time for the edge detection signal to stop outputting the first level exceeds a first preset time. The output terminal of the motion monitoring circuit is electrically connected to the second input terminal of the signal conversion module; the motion monitoring circuit is used to output the motion monitoring signal according to the signal of the fourth node.

6. The short-circuit testing device for high-voltage equipment according to claim 5, characterized in that, The pulse holding circuit includes: a second capacitor and a third resistor; The second capacitor and the third resistor are connected in parallel between the fourth node and the ground terminal.

7. The short-circuit testing device for high-voltage equipment according to claim 5, characterized in that, The motion monitoring circuit includes: a comparator, a fourth resistor, and a fifth resistor; The non-inverting input of the comparator is electrically connected to the fourth node, the inverting input of the comparator is electrically connected to the first voltage source through the fourth resistor, and the inverting input of the comparator is electrically connected to the ground terminal through the fifth resistor.

8. The short-circuit testing device according to claim 1, characterized in that, The signal conversion module includes: a charge / discharge control circuit, a pull-down control circuit, an energy storage circuit, and a hysteresis output circuit; The first terminal of the charge / discharge control circuit is electrically connected to the output terminal of the edge detection module, the second terminal of the charge / discharge control circuit is electrically connected to the input terminal of the hysteresis output circuit at the fifth node, and the energy storage circuit is electrically connected between the fifth node and the ground terminal; the charge / discharge control circuit is used to charge the energy storage circuit when the edge detection signal is at the first level, and to discharge the energy storage circuit when the edge detection signal is at the second level. The input terminal of the pull-down control circuit is electrically connected to the output terminal of the motion monitoring module, and the output terminal of the pull-down control circuit is electrically connected to the fifth node; the pull-down control circuit is used to control the input terminal of the pull-down control circuit and the fifth node to be in an open circuit state when the motion monitoring signal is at the first level, and to pull the potential of the fifth node down to a preset potential when the motion monitoring signal is at the second level. The output terminal of the hysteresis output circuit is electrically connected to the contactor; the hysteresis output circuit is used to output the short-circuit control signal according to the signal of the fifth node.

9. The short-circuit testing device for high-voltage equipment according to claim 8, characterized in that, The charge / discharge control circuit includes a third diode, a sixth resistor, and a seventh resistor; The anode of the third diode is electrically connected to the output terminal of the edge detection module, and the cathode of the third diode is electrically connected to the fifth node through the sixth resistor; The seventh resistor is electrically connected between the output terminal of the edge detection module and the fifth node.

10. The short-circuit testing device for high-voltage equipment according to claim 8, characterized in that, The pull-down control circuit includes: a fourth diode; The anode of the fourth diode is electrically connected to the output terminal of the motion monitoring module, and the cathode of the fourth diode is electrically connected to the fifth node.

11. The short-circuit testing device for high-voltage equipment according to claim 8, characterized in that, The hysteresis output circuit includes: a second comparator, an eighth resistor, a ninth resistor, and a tenth resistor; The non-inverting input terminal of the second comparator is electrically connected to the first voltage source through the eighth resistor, the non-inverting input terminal of the second comparator is electrically connected to the ground terminal through the ninth resistor, and the non-inverting input terminal of the second comparator is electrically connected to the output terminal of the second comparator through the tenth resistor; The inverting input of the second comparator is electrically connected to the fifth node, and the output of the second comparator is electrically connected to the contactor.

12. The short-circuit testing device for high-voltage equipment according to claim 8, characterized in that, The signal conversion module further includes: an amplifier circuit; The input terminal of the amplifier circuit is electrically connected to the output terminal of the hysteresis output circuit, and the output terminal of the amplifier circuit is electrically connected to the contactor; the amplifier circuit is used to amplify the short-circuit control signal and output it to the contactor.

Images