Electronic lock control circuit for high-voltage protection and high-voltage electrical control cabinet

Abstract

The application discloses an electronic lock control circuit for high-voltage protection, which is used for controlling the opening and closing of an electronic lock on a high-voltage electrical control cabinet. The high-voltage electrical control cabinet has a power input interface and a power output interface. A total circuit breaker controls the on-off of an electric circuit between the power input interface and the power output interface. The detection point of the electronic lock control circuit is connected to the power input interface through the total circuit breaker and directly connected to the power output interface. The voltage difference of the power input interface and the voltage difference of the power output interface are detected. When any voltage difference exceeds the human body safety voltage, the electronic lock is controlled to be locked to prohibit the opening of the high-voltage electrical control cabinet. When all the voltage differences do not exceed the human body safety voltage, the electronic lock is controlled to be opened. The application can ensure that when the high-voltage electrical control cabinet is opened, the total circuit breaker is effectively disconnected and the terminal voltage at the load is reduced to below the safety voltage, so that the maintenance of the high-voltage electrical control cabinet is safe and reliable. The application also discloses a high-voltage electrical control cabinet.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology and control, and in particular to high-voltage protection for electrical cabinets. Background Technology

[0002] With the development of technology and the improvement of energy efficiency, more and more industrial equipment is operating at voltages exceeding the safe working range for humans. Furthermore, industrial environments involve a wide variety of voltage levels and types. To ensure human safety and prevent electric shock during the installation, maintenance, and debugging of equipment in high-voltage environments, existing electrical cabinets are often equipped with high-voltage safety electronic locks. For example, Chinese patent CN112202062A discloses a high- and low-voltage electrical cabinet with a safety switch. The cabinet door is doubly locked by both a door lock and an electronic lock. When there is a leakage inside the cabinet, the controller locks the electronic lock, preventing the user from opening the door. This makes the electronic lock a safety switch for the cabinet; the user can only open the door when there is no leakage, allowing the user to accurately determine if there is a leakage inside the cabinet. However, this technology only ensures the cabinet is closed when there is a leakage, not that it can be opened when the power is off. When this cabinet is used with high-voltage equipment, safety hazards still exist.

[0003] Therefore, there is an urgent need for an electronic lock control circuit and a high-voltage electrical control cabinet that can solve the above problems for high-voltage protection. Summary of the Invention

[0004] The purpose of this invention is to provide an electronic lock control circuit and a high-voltage electrical control cabinet for high-voltage protection, which are safe and reliable.

[0005] To achieve the above objectives, this invention discloses an electronic lock control circuit for high-voltage protection, used to control the opening and closing of an electronic lock on a high-voltage electrical control cabinet. The high-voltage electrical control cabinet has a power input interface and a power output interface, which are electrically connected. A main circuit breaker is connected in series between the power input interface and the power output interface. The detection point of the electronic lock control circuit is connected to the power input interface through the main circuit breaker and directly to the power output interface. It detects the voltage difference between the power input interface and the power output interface. When either voltage difference exceeds the safe voltage for a human body, the electronic lock is locked to prevent the high-voltage electrical control cabinet from opening. When all voltage differences do not exceed the safe voltage for a human body, the electronic lock is opened or allowed to open.

[0006] Compared to existing technologies, this invention connects the main circuit breaker to the power input interface to detect the voltage difference at the power input interface. This allows the electronic lock to be locked in the event of a main circuit breaker failure, preventing it from opening. On the other hand, this invention directly connects to the power output interface to detect the voltage difference at the power output interface (there is no on / off switch between the power output interface and the detection point; instead, they are directly connected via a conductor). This prevents electric shock risks when opening the control cabinet, even if the DC main circuit breaker and related control contactors are disconnected, when the equipment has a large capacitive load. The electronic lock can only be opened when the voltage at the equipment terminal drops below a safe voltage. In other words, this invention ensures that when the high-voltage electrical control cabinet is opened, the main circuit breaker is effectively disconnected and the voltage at the equipment terminal drops below a safe voltage by detecting the voltage values ​​at the power input and output interfaces, making the maintenance of the high-voltage electrical control cabinet safe and reliable.

[0007] Preferably, the power input interface has a positive input terminal and a negative input terminal for inputting high-voltage DC power, and the power output interface has a positive output terminal and a negative output terminal for outputting high-voltage DC power. The positive input terminal and the positive output terminal are electrically connected, and the negative input terminal and the negative output terminal are electrically connected to form an electrical branch. At least one on / off switch of the main circuit breaker is connected in series on each electrical branch. The detection point of the electronic lock control circuit is connected to the positive input terminal and the negative input terminal through the on / off switch. The detection point of the electronic lock control circuit is directly connected to the positive output terminal and the negative output terminal through a conductor. It detects the voltage difference between the positive input terminal and the negative input terminal, between the positive input terminal and the grounding point, between the negative input terminal and the grounding point, and between the positive output terminal and the negative output terminal. When any of the voltage differences exceeds the human safety voltage, the electronic lock is controlled to lock to prevent the high-voltage electrical control cabinet from opening. When all the voltage differences do not exceed the human safety voltage, the electronic lock is controlled to open or the electronic lock is allowed to open. The high-voltage electrical control cabinet in this solution is a high-voltage DC electrical control cabinet. The power input interface receives high-voltage DC electricity. This invention not only detects the voltage difference between the positive and negative terminals of the voltage input interface, but also detects the voltage difference between each terminal and ground in the voltage input interface. This not only effectively prevents false high-voltage detection caused by users connecting the positive and negative terminals, but also ensures that the main circuit breaker disconnects the power supply to each terminal.

[0008] Specifically, the main circuit breaker includes a first on / off switch connected in series between the positive input terminal and the first interface, and a second on / off switch connected in series between the negative input terminal and the second interface. The detection points include a first detection point electrically connected to the first interface, a second detection point electrically connected to the second interface, a third detection point electrically connected to the first interface, a fourth detection point electrically connected to the second interface, a fifth detection point electrically connected to the positive output terminal, and a sixth detection point electrically connected to the negative output terminal. The electronic lock control circuit includes a detection circuit, which includes a first detection circuit connected to the first and second detection points, a second detection circuit connected to the third detection point and a grounding point, a third detection circuit connected to the fourth detection point and a grounding point, and a fourth detection circuit connected to the fifth and sixth detection points. The first detection circuit detects a first voltage difference between the positive input terminal and the negative input terminal, the second detection circuit detects a second voltage difference between the positive input terminal and the grounding point, the third detection circuit detects a third voltage difference between the negative input terminal and the grounding point, and the fourth detection circuit detects a fourth voltage difference between the positive output terminal and the negative output terminal.

[0009] Preferably, the electronic lock control circuit rectifies the electrical signal input at the detection point and acquires the rectified electrical signal to obtain the voltage difference. This solution can not only effectively prevent false high-voltage detection caused by incorrect terminal connection by the user, but also make the present invention applicable to three-phase power detection and high-voltage AC detection.

[0010] Specifically, the power input interface and power output interface each have multiple conductive terminals with different polarities. Corresponding conductive terminals of the power input interface and power output interface are electrically connected to form multiple electrical branches. At least one main circuit breaker switch is connected in series on each of these electrical branches. The detection point of the electronic lock control circuit is connected to each conductive terminal of the power input interface through the circuit breaker. The electronic lock control circuit detects the voltage difference between any two conductive terminals and the voltage difference between each conductive terminal and the grounding point. The detection point of the electronic lock control circuit is directly connected to each conductive terminal of the power output interface. It detects the voltage difference between any two conductive terminals. When any voltage difference exceeds the human safety voltage, the electronic lock is locked to prevent the high-voltage electrical control cabinet from opening. When all voltage differences do not exceed the human safety voltage, the electronic lock is opened or allowed to open. When the power input interface is three-phase AC, the conductive terminals of the power input interface and voltage output interface include three-phase terminals, a neutral terminal, and a ground terminal.

[0011] Preferably, the electronic lock control circuit includes a rectifier circuit, a sampling circuit, a comparator circuit, an electronic lock drive circuit, and a power supply circuit. The power supply circuit provides a reference voltage to power the comparator circuit and the electronic lock drive circuit. The rectifier circuit rectifies the electrical signal input at the detection point to output a first DC signal corresponding to the voltage difference. The sampling circuit acquires the first DC signal and converts it into a corresponding second voltage signal. The comparator circuit compares each second voltage signal with a reference voltage corresponding to a human safety voltage, and outputs a corresponding high or low level lock signal to the electronic lock drive circuit when the second voltage signal exceeds the reference voltage. The electronic lock drive circuit controls the electronic lock to lock according to the lock signal.

[0012] Specifically, the sampling circuit is an isolated high-voltage sampling circuit, including a voltage acquisition circuit connected to the first DC signal and an isolation circuit connected to the voltage acquisition circuit. The voltage acquisition circuit acquires the voltage value of the first DC signal and sends it to the isolation circuit. The isolation circuit isolates and converts the voltage value acquired by the voltage acquisition circuit into a second voltage signal. The comparison circuit includes an operational amplifier circuit and an operational comparator. The operational amplifier circuit amplifies the second voltage signal, and the operational comparator compares the amplified second voltage signal with a reference voltage and sends the comparison result to the electronic lock drive circuit through a unidirectional diode.

[0013] Preferably, the electronic lock control circuit includes multiple detection control circuits and an electronic lock drive circuit corresponding to the voltage difference. The output terminals of the multiple detection control circuits are electrically connected to the electronic lock drive circuit through unidirectional conducting diodes. Each detection control circuit includes a sampling circuit and a comparison circuit. The sampling circuit acquires the voltage difference, and the comparison circuit compares whether the voltage difference exceeds the safe voltage for the human body. When the voltage difference exceeds the safe voltage for the human body, a high-level detection signal is output. The electronic lock drive circuit controls the electronic lock to lock based on the high-level detection signal. No software calculation processing is required; only hardware circuitry is needed to realize the opening and closing of the electronic lock, ensuring safety and reliability.

[0014] The present invention also discloses a high-voltage electrical control cabinet, wherein an electronic lock is installed on the cabinet door, and an electronic lock control circuit for high-voltage protection as described above is installed inside the high-voltage electrical control cabinet. The power input interface is the high-voltage bus input terminal of the high-voltage electrical control cabinet to input high-voltage power to the high-voltage electrical control cabinet, and the power output interface is the high-voltage bus output terminal of the high-voltage electrical control cabinet to output high-voltage power to supply power to the power supply equipment.

[0015] Preferably, a DC contactor and a fuse are connected in series between the power input interface and the power output interface. The DC contactor and the fuse are connected in series between the main circuit breaker and the power output interface. When any of the voltage differences exceeds the overvoltage, the high-voltage electrical control cabinet controls the DC contactor to operate so that the DC contactor disconnects.

[0016] Preferably, the power input interface is connected to the high-voltage input bus of the high-voltage electrical control cabinet, and the power output interface is connected to the high-voltage output bus of the high-voltage electrical control cabinet.

[0017] Preferably, the main circuit breaker is a dedicated main circuit breaker for motors, and also includes a control unit for controlling the operation of the main circuit breaker. Operating the control unit can control the on / off operation of the main circuit breaker. Attached Figure Description

[0018] Figure 1 This is a circuit diagram of the electronic lock control circuit of the present invention installed in a high-voltage electrical control cabinet.

[0019] Figure 2 This is a structural diagram of the electronic lock control circuit of the present invention.

[0020] Figure 3 This is a circuit diagram of the rectifier circuit of the present invention.

[0021] Figure 4 This is a circuit diagram of the sampling circuit of the present invention. Detailed Implementation

[0022] To illustrate the technical content, structural features, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] refer to Figure 1 This invention discloses an electronic lock control circuit 10 for high-voltage protection, used to control the opening and closing of an electronic lock 40 on a high-voltage electrical control cabinet. The high-voltage electrical control cabinet has a power input interface 20 and a power output interface 30, which are electrically connected. A circuit breaker QF is connected in series between the power input interface 20 and the power output interface 30. The detection point of the electronic lock control circuit 10 is connected to the power input interface 20 through the circuit breaker QF, and directly connected to the power output interface 30 without going through the circuit breaker QF. The circuit detects the voltage difference between the power input interface 20 and the power output interface 30. When any of the voltage differences exceeds the human safety voltage, the electronic lock 40 is locked to prevent the high-voltage electrical control cabinet from opening. When all the voltage differences do not exceed the human safety voltage, the electronic lock 40 is opened or allowed to open.

[0024] In this embodiment, the electronic lock control circuit 10 is integrated on a control board, and the power output interface 30 is mounted on an adapter board as the input terminal of the adapter board, which outputs multiple power signals.

[0025] refer to Figure 1 The power input interface 20 has a positive input terminal and a negative input terminal for inputting high-voltage DC power, and the power output interface 30 has a positive output terminal and a negative output terminal for outputting high-voltage DC power. The positive input terminal and the positive output terminal are electrically connected, and the negative input terminal and the negative output terminal are electrically connected to form an electrical branch. At least one on / off switch QF is connected in series on each electrical branch. The detection point of the electronic lock control circuit 10 is connected to the positive input terminal and the negative input terminal through the on / off switch QF. The detection points are directly connected to the positive and negative output terminals via conductors to detect the voltage differences between the positive and negative input terminals, between the positive input terminal and the grounding point, between the negative input terminal and the grounding point, and between the positive and negative output terminals. When any of the voltage differences exceeds the safe voltage for the human body, the electronic lock 40 is locked to prevent the high-voltage electrical control cabinet from opening. When all the voltage differences do not exceed the safe voltage for the human body, the electronic lock 40 is either opened or allowed to open.

[0026] refer to Figure 1 The main circuit breaker QF includes a first on / off switch QF connected in series between the positive input terminal and the first interface, and a second on / off switch QF connected in series between the negative input terminal and the second interface. The detection points include a first detection point x1 electrically connected to the first interface (pin 2 of the main circuit breaker), a second detection point x2 electrically connected to the second interface (pin 4 of the main circuit breaker), a third detection point x3 electrically connected to the first interface (pin 2 of the main circuit breaker), a fourth detection point x4 electrically connected to the grounding point, a fifth detection point x5 electrically connected to the second interface, a sixth detection point x6 electrically connected to the grounding point, a seventh detection point x7 electrically connected to the positive output terminal, and an eighth detection point x8 electrically connected to the negative output terminal.

[0027] refer to Figure 3The electronic lock control circuit 10 includes multiple detection control circuits corresponding to the detected voltage difference, an electronic lock drive circuit 24 electrically connected to the multiple detection control circuits, and a power supply circuit 25. Control signals output by the multiple detection control circuits are electrically connected to the electronic lock drive circuit 24 via unidirectional diodes. Each detection control circuit includes a detection circuit and a control circuit; in this embodiment, there are four detection control circuits. The detection control circuit outputs a high level when the voltage difference exceeds the safe voltage for the human body, so that when any one of the multiple detection control circuits has a voltage difference exceeding the safe voltage for the human body, it outputs a high level to the electronic lock drive circuit 24, causing the electronic lock drive circuit 24 to lock the electronic lock 40. This scheme allows the present invention to achieve multi-channel sampling control directly using hardware circuits without software program control, resulting in high safety and reliability.

[0028] refer to Figure 1 and Figure 2 The four detection control circuits are respectively connected to the first detection point x1 and the second detection point x2, the second detection circuit connected to the third detection point x3 and the fourth detection point x4, the third detection circuit connected to the fifth detection point x5 and the sixth detection point x6, and the fourth detection circuit connected to the seventh detection point x7 and the eighth detection point x8. The first voltage difference between the positive input terminal and the negative input terminal is detected by the second detection circuit, the second voltage difference between the positive input terminal and the ground point is detected by the second detection circuit, the third detection circuit detects the third voltage difference between the negative input terminal and the ground point, and the fourth detection circuit detects the fourth voltage difference between the positive output terminal and the negative output terminal.

[0029] The detection control circuit rectifies the electrical signal input at the detection point and acquires the rectified electrical signal to obtain the voltage difference.

[0030] The detection circuit includes a rectifier circuit 21 and a sampling circuit 22. The control circuit includes a comparator circuit 23. The power supply circuit provides a reference voltage to power the comparator circuit and the electronic lock 40 driving circuit. The rectifier circuit 21 rectifies the electrical signal input at the detection point to output a first DC signal corresponding to the voltage difference. The sampling circuit 22 acquires the first DC signal and converts it into a corresponding second voltage signal. The comparator circuit 23 compares each second voltage signal with a reference voltage corresponding to the human safety voltage, and outputs a corresponding high or low level lock-up signal to the electronic lock driving circuit 24 when the second voltage signal exceeds the reference voltage. The electronic lock driving circuit 24 controls the electronic lock 40 to lock according to the lock-up signal. The comparator circuit 23 outputs a high level when the voltage difference is greater than the human safety voltage.

[0031] The electronic lock drive circuit 24 is a switching circuit composed of multiple transistors, resistors, capacitors, and diodes. When it receives an unlocking control signal, this switching circuit inputs a corresponding high or low level to the control terminal of the electronic lock 40 to control the electronic lock 40 to open. The electronic lock 40 is a solenoid valve electronic lock, and the electronic lock drive circuit 24 is connected to the solenoid valve coil in the solenoid valve electronic lock to control the opening and closing of the electronic lock.

[0032] refer to Figure 3 Here is the circuit diagram of rectifier circuit 21, which consists of resistor R1, resistor R2, and diodes D1-D4. Resistors R1 and R2 are connected to the two input terminals of rectifier circuit 21 as current limiting resistors.

[0033] refer to Figure 4 The sampling circuit 22 is an isolated high-voltage sampling circuit, including a voltage acquisition circuit 221 connected to the first DC signal and an isolation circuit 222 connected to the voltage acquisition circuit 221. The voltage acquisition circuit 221 acquires the voltage value of the first DC signal and sends it to the isolation circuit 222. The isolation circuit 222 isolates and converts the voltage value acquired by the voltage acquisition circuit into a second voltage signal. In this embodiment, the voltage acquisition circuit 221 includes a first branch composed of resistors R3-R7, resistors R8 and R9, and a capacitor C1. The first branch is connected in series between the positive terminal of the first DC signal and the voltage divider node. Resistor R8 is connected in series between the voltage divider node and the negative terminal of the first DC signal. Resistor R9 is connected between the voltage divider node and the input terminal of the isolated high-voltage sampling circuit. Capacitor C1 is connected between the end of resistor R9 away from the voltage divider node and the ground point. The negative terminal of the first DC signal is grounded. The first branch is composed of multiple large resistors connected in series, which can effectively divert most of the voltage to prevent damage to the isolation circuit 222, and enable the voltage acquisition circuit 221 to acquire high voltage at low cost.

[0034] The comparison circuit 23 includes an operational amplifier circuit and an operational comparator. The operational amplifier circuit amplifies the second voltage signal, and the operational comparator compares the amplified second voltage signal with a reference voltage and transmits the comparison result (high or low level) to the electronic lock 40 drive circuit through a unidirectional diode.

[0035] The present invention also discloses a high-voltage electrical control cabinet, wherein an electronic lock 40 is installed on the cabinet door, and an electronic lock control circuit 10 for high-voltage protection as described above is installed inside the high-voltage electrical control cabinet.

[0036] The power input interface 20 and the power output interface 30 are connected in series with a DC contactor KM1's on / off switch KM1 and a fuse FU1. Similarly, the power input interface 20 and the power output interface 30 are connected in series with a DC contactor KM2's on / off switch KM2 and a fuse FU2. The on / off switches KM1 and KM2 and the fuses FU1 and FU2 are connected in series between the main circuit breaker QF's on / off switch QF and the power output interface 30. When any voltage difference exceeds the overvoltage, the high-voltage electrical control cabinet controls the DC contactors KM1 and KM2 to operate, causing their on / off switches KM1 and KM2 to disconnect.

[0037] The power input interface 20 is connected to the high-voltage bus input terminal of the high-voltage electrical control cabinet to input high-voltage power to the high-voltage electrical control cabinet, and the power output interface 30 is connected to the high-voltage bus output terminal of the high-voltage electrical control cabinet to output high-voltage power to supply power to the power supply equipment.

[0038] refer to Figure 1 The main circuit breaker QF is a dedicated main circuit breaker QF for electric motors, and also includes a control component for controlling the operation of the main circuit breaker QF. Operating the control component can control the on / off operation of the main circuit breaker QF switch QF.

[0039] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An electronic lock control circuit for high-voltage protection, used to control the opening and closing of an electronic lock on a high-voltage electrical control cabinet, the high-voltage electrical control cabinet having a power input interface and a power output interface, the power input interface and the power output interface being electrically connected, and a main circuit breaker being connected in series between the power input interface and the power output interface, characterized in that: The detection point of the electronic lock control circuit is connected to the power input interface through the main circuit breaker and directly to the power output interface. It detects the voltage difference between the power input interface and the power output interface. When either voltage difference exceeds the human safety voltage, the electronic lock is locked to prevent the high-voltage electrical control cabinet from opening. When all voltage differences do not exceed the human safety voltage, the electronic lock is opened or allowed to open.

2. The electronic lock control circuit for high-voltage protection as described in claim 1, characterized in that: The power input interface has positive and negative input terminals for inputting high-voltage DC power, and the power output interface has positive and negative output terminals for outputting high-voltage DC power. The positive input and positive output terminals are electrically connected, and the negative input and negative output terminals are electrically connected to form an electrical branch. At least one of the main circuit breakers is connected in series on each electrical branch. The detection point of the electronic lock control circuit is connected to the positive and negative input terminals through the on / off switch. The detection point of the electronic lock control circuit is directly connected to the positive and negative output terminals through a conductor. It detects the voltage difference between the positive and negative input terminals, between the positive input terminal and the grounding point, between the negative input terminal and the grounding point, and between the positive and negative output terminals. When any of the voltage differences exceeds the human safety voltage, the electronic lock is locked to prevent the high-voltage electrical control cabinet from opening. When all the voltage differences do not exceed the human safety voltage, the electronic lock is opened or allowed to open.

3. The electronic lock control circuit for high-voltage protection as described in claim 2, characterized in that: The main circuit breaker includes a first on / off switch connected in series between the positive input terminal and the first interface, and a second on / off switch connected in series between the negative input terminal and the second interface. The detection points include a first detection point electrically connected to the first interface, a second detection point electrically connected to the second interface, a third detection point electrically connected to the first interface, a fourth detection point electrically connected to the second interface, a fifth detection point electrically connected to the positive output terminal, and a sixth detection point electrically connected to the negative output terminal. The electronic lock control circuit includes a detection circuit, which comprises a first detection circuit connected to a first detection point and a second detection point, a second detection circuit connected to a third detection point and a grounding point, a third detection circuit connected to a fourth detection point and a grounding point, and a fourth detection circuit connected to a fifth detection point and a sixth detection point. The first detection circuit detects a first voltage difference between the positive input terminal and the negative input terminal, the second detection circuit detects a second voltage difference between the positive input terminal and the grounding point, the third detection circuit detects a third voltage difference between the negative input terminal and the grounding point, and the fourth detection circuit detects a fourth voltage difference between the positive output terminal and the negative output terminal.

4. The electronic lock control circuit for high-voltage protection as described in claim 1, characterized in that: The electronic lock control circuit rectifies the electrical signal input at the detection point and acquires the rectified electrical signal to obtain the voltage difference.

5. The electronic lock control circuit for high-voltage protection as described in claim 1, characterized in that: The electronic lock control circuit includes a rectifier circuit, a sampling circuit, a comparator circuit, an electronic lock drive circuit, and a power supply circuit. The power supply circuit provides a reference voltage to power the comparator circuit and the electronic lock drive circuit. The rectifier circuit rectifies the electrical signal input at the detection point to output a first DC signal corresponding to the voltage difference. The sampling circuit acquires the first DC signal and converts it into a corresponding second voltage signal. The comparator circuit compares each second voltage signal with a reference voltage corresponding to a human safety voltage, and outputs a corresponding high or low level lock signal to the electronic lock drive circuit when the second voltage signal exceeds the reference voltage. The electronic lock drive circuit controls the electronic lock to lock according to the lock signal.

6. The electronic lock control circuit for high-voltage protection as described in claim 5, characterized in that: The sampling circuit is an isolated high-voltage sampling circuit, including a voltage acquisition circuit connected to the first DC signal and an isolation circuit connected to the voltage acquisition circuit. The voltage acquisition circuit acquires the voltage value of the first DC signal and sends it to the isolation circuit. The isolation circuit isolates and converts the voltage value acquired by the voltage acquisition circuit into a second voltage signal. The comparison circuit includes an operational amplifier circuit and an operational comparator. The operational amplifier circuit amplifies the second voltage signal, and the operational comparator compares the amplified second voltage signal with a reference voltage and sends the comparison result to the electronic lock drive circuit through a unidirectional diode.

7. The electronic lock control circuit for high-voltage protection as described in claim 1, characterized in that: The electronic lock control circuit includes multiple detection control circuits and an electronic lock drive circuit corresponding to the voltage difference. The output terminals of the multiple detection control circuits are electrically connected to the electronic lock drive circuit through unidirectional conduction diodes. The detection control circuit includes a sampling circuit and a comparison circuit. The sampling circuit collects the voltage difference corresponding to the voltage difference. The comparison circuit compares whether the voltage difference exceeds the human body safety voltage. When the voltage difference exceeds the human body safety voltage, a high-level detection signal is output. The electronic lock drive circuit controls the electronic lock to lock based on the high-level detection signal.

8. A high-voltage electrical control cabinet, wherein an electronic lock is installed on the cabinet door, and an electronic lock control circuit for high-voltage protection as described in any one of claims 1 to 7 is installed inside the high-voltage electrical control cabinet, wherein the power input interface is the high-voltage bus input terminal of the high-voltage electrical control cabinet to input high-voltage power to the high-voltage electrical control cabinet, and the power output interface is the high-voltage bus output terminal of the high-voltage electrical control cabinet to output high-voltage power to supply power to the power supply equipment.

9. The high-voltage electrical control cabinet as described in claim 8, characterized in that: A DC contactor switch and a fuse are connected in series between the power input interface and the power output interface. The DC contactor and fuse are connected in series between the main circuit breaker and the power output interface. When any of the voltage differences exceeds the overvoltage, the high-voltage electrical control cabinet controls the DC contactor to operate so that the DC contactor is disconnected.

10. The high-voltage electrical control cabinet as described in claim 8, characterized in that: The main circuit breaker is a dedicated main circuit breaker for electric motors, and also includes a control component for controlling the operation of the main circuit breaker. Operating the control component can control the on / off operation of the main circuit breaker.

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