Control circuit, controller, mechanism and method for opening and closing of direct-current switch

Abstract

The invention belongs to the technical field of switches, and discloses a control circuit, a controller, a mechanism and a method for opening and closing a direct current switch, and the circuit comprises an opening operation control loop, a closing operation control loop, an opening energy storage capacitor discharge loop and a closing energy storage capacitor discharge loop. Each of the opening operation control loop and the closing operation control loop comprises an air switch, an EMI filter circuit module, a rectifier bridge module, a power conversion circuit module, a high-frequency transformer and a quadruple voltage rectification filter circuit module which are connected in sequence; the power conversion circuit module is provided with a power switch, and the opening operation control loop is provided with an opening loop energy storage capacitor; the closing operation control loop is provided with a closing loop energy storage capacitor. According to the invention, an energy release channel can be quickly provided for the system after the direct-current power transmission equipment breaks down, and stable operation of the power system is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of switches, and in particular relates to a control circuit, a controller, a mechanism and a method for opening and closing a DC switch. Background Art

[0002] In DC transmission projects, conventional DC is connected in series with flexible DC at the receiving end to achieve large-capacity transmission and flexible power absorption. When a fault occurs on the AC side, overvoltage and energy accumulation will quickly appear on the flexible DC busbar. A parallel self-recovering energy dissipation device is required as a system fault energy discharge channel to effectively protect the safety of the flexible DC converter valve group and prevent the power system from stopping operation and other working conditions.

[0003] A DC fast-acting switch (DC switch) is a millisecond-speed fast-closing switch used in DC systems. It is often connected in parallel with a gap switch as a fast control / protection switch. In a self-recoverable energy dissipation device system, the self-recoverable energy dissipation device is connected in parallel with the trigger gap and the DC switch. Upon receiving a trigger command, the DC switch can quickly and reliably close, bypassing the controlled components of the self-recoverable energy dissipation device if the gap in the self-recoverable energy dissipation device system fails. This partially limits the residual pressure of the self-recoverable energy dissipation device through the fixed components of the self-recoverable energy dissipation device, significantly improving the self-recoverable energy dissipation device's ability to absorb redundant energy and quickly restore insulation requirements.

[0004] The operating mechanism of the DC switch is an electromagnetic repulsion mechanism. The opening operation control circuit, the closing operation control circuit and the controller are important components of the electromagnetic repulsion mechanism. The controller receives the opening or closing command issued by the control and protection system of the controllable energy dissipation device, and sends an operation command signal to the opening operation control circuit or the closing operation control circuit when it determines that the electromagnetic repulsion mechanism body has the conditions for opening or closing. The energy storage capacitor is triggered to discharge the repulsion coil to form a pulse current. The current generates a pulse magnetic field around the repulsion coil. The repulsion disk forms an induced eddy current due to the action of the pulse magnetic field. The direction of the eddy current is opposite to the direction of the current in the repulsion coil, generating a huge electromagnetic repulsion force between the repulsion coil and the repulsion disk, pushing the repulsion disk to move at high speed, thereby completing the opening or closing operation; at the same time, the controller collects the DC high-voltage output current and voltage of the opening operation control circuit and the closing operation control circuit to achieve the purpose of controlling and stabilizing the output current and voltage.

[0005] The existing technical solution involves operating the electromagnetic repulsion mechanism's opening and closing control circuits and controller as two separate devices, connected by wires for signal transmission and operations such as charging the energy storage capacitor and triggering the thyristors. The opening or closing energy storage capacitor voltage is obtained by rectifying 220V AC and then boosting it using a power-frequency transformer. The DC high-voltage voltage is initially set to a rated value, and the controller controls the charging of the opening or closing energy storage capacitor to achieve the rated voltage.

[0006] The Chinese patent publication number is CN117423559A, titled "A patent application for a fast-switching electromagnetic repulsion mechanism." The mechanism includes a repulsion disk, an opening repulsion coil, a closing repulsion coil, an insulating pull rod, a trigger, a controller, and an energy supply system. The controller includes a central processing module, a high-speed analog acquisition and recording module, a first optical fiber communication module, a second optical fiber communication module, an Ethernet debugging module, a photo-controlled thyristor drive module, and an operating status display module. The trigger includes a closing operation control circuit and an opening operation control circuit. Both the closing operation control circuit and the opening operation control circuit include a charging and discharging module, a low-speed capacitor voltage acquisition module, and a photo-controlled thyristor. This patent application fails to address the technical issues of the large size and instability of the opening and closing control circuits. Summary of the Invention

[0007] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a control circuit, controller, mechanism and method for the opening and closing of a DC switch, wherein the controller controls the discharge of the energy storage capacitor of the electromagnetic repulsion mechanism to realize the opening or closing operation of the DC switch. On the one hand, the present invention realizes the rapid opening or closing operation of the DC switch operating mechanism through the control circuit of the DC switch opening and closing, ensuring that after a fault occurs in the DC power transmission equipment, it can quickly provide an energy discharge channel for the system to ensure the stable operation of the power system; on the other hand, the controller has a DC high-voltage output current and voltage feedback control circuit composed of a voltage and current sampling circuit module, a signal conditioning circuit module, an A / D conversion circuit module, a CPU control algorithm module and a PWM output and power drive circuit module, forming a closed-loop control system with the DC high-voltage output current and voltage, and comparing the output current and voltage set values ​​with the DC high-voltage output current and voltage sampling information obtained from the output end, and adjusting the power conversion circuit module through the feedback control circuit of the controller to achieve the purpose of controlling and stabilizing the DC high-voltage output current and voltage.

[0008] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a control circuit for opening and closing a DC switch, comprising: an opening operation control circuit, a closing operation control circuit, an opening energy storage capacitor discharge circuit, and a closing energy storage capacitor discharge circuit; the opening operation control circuit and the closing operation control circuit both comprise an air switch, an EMI filter circuit module, a rectifier bridge module, a power conversion circuit module, a high-frequency transformer, and a quadruple voltage rectifier filter circuit module connected in sequence; the power conversion circuit module has a power switch; the first output end of the opening operation control circuit is connected to a first thyristor through a first energy storage capacitor charging resistor, and the first thyristor is connected to the opening energy storage capacitor discharge circuit; the first output end of the closing operation control circuit is connected to a second thyristor through a second energy storage capacitor charging resistor, and the second thyristor is connected to the closing energy storage capacitor discharge circuit; the opening operation control circuit has an opening circuit energy storage capacitor; the closing operation control circuit has a closing circuit energy storage capacitor.

[0009] Optionally, the quadruple voltage rectifier filter circuit modules of the opening operation control loop and the closing operation control loop both have a first output end and a second output end; the first output end of the opening operation control loop is connected to a first node through a first energy storage capacitor charging resistor, and the first node is connected to the first thyristor; the first output end of the closing operation control loop is connected to a second node through a second energy storage capacitor charging resistor, and the second node is connected to the second thyristor.

[0010] Optionally, the second output end of the closing operation control loop is connected to the second node through the closing circuit energy storage capacitor, and the second output end of the closing operation control loop is grounded; the second output end of the opening operation control loop is connected to the first node through the opening circuit energy storage capacitor, and the second output end of the opening operation control loop is grounded.

[0011] Optionally, the first node is connected to a first protection diode and a first lightning arrester; the second node is connected to a second protection diode and a second lightning arrester; the negative electrode of the first protection diode is connected to the first node, the positive electrode of the first thyristor and the first end of the first lightning arrester, and the positive electrode is connected to the negative electrode of the first thyristor and the second end of the first lightning arrester; the first end of the first lightning arrester is connected to the positive electrode of the first thyristor and the first node; the second end of the first lightning arrester is connected to the second output end of the opening operation control loop through a first energy storage capacitor freewheeling resistor; the negative electrode of the second protection diode is connected to the second node, the positive electrode of the second thyristor and the first end of the second lightning arrester, and the positive electrode is connected to the negative electrode of the second thyristor and the second end of the second lightning arrester; the first end of the second lightning arrester is connected to the positive electrode of the second thyristor and the second node; the second end of the second lightning arrester is connected to the second output end of the closing operation control loop through a second energy storage capacitor freewheeling resistor.

[0012] Optionally, the open energy storage capacitor discharge circuit includes: a first two-position selection switch, a first manual switch, a first normally open relay, a first discharge resistor and a first vacuum relay; the closed energy storage capacitor discharge circuit includes: a second two-position selection switch, a second manual switch, a second normally open relay, a second discharge resistor and a second vacuum relay; the first normally open relay and the second normally open relay both have a switch end and a control end; the first vacuum relay and the second vacuum relay both have a switch end and a control end; one end of the first discharge resistor is connected to the first node, and the other end is connected to the switch of the first vacuum relay, the other end of the switch of the first vacuum relay is grounded, one end of the control end of the first vacuum relay is connected to the sixth port, and the other end is respectively connected to one end of the switch end of the first manual switch and the first normally open relay; the other end of the switch end of the first normally open relay A fifth port is connected; the other end of the first manual switch is connected to a fourth port, and the fifth port and the fourth port are set at the switch selection position of the first two-position selection switch; the other end of the first two-position selection switch is connected to a third port; one end of the second discharge resistor is connected to the second node, and the other end is connected to the switch of the second vacuum relay, and the other end of the switch of the second vacuum relay is grounded; one end of the control end of the second vacuum relay is connected to a twelfth port, and the other end is respectively connected to one end of the switch end of the second manual switch and the second normally-open relay; the other end of the switch end of the second normally-open relay is connected to an eleventh port; the other end of the second manual switch is connected to a tenth port, and the eleventh port and the tenth port are set at the switch selection position of the second two-position selection switch; the other end of the second two-position selection switch is connected to a ninth port.

[0013] Optionally, the high-frequency transformer in the opening operation control loop is a first high-frequency transformer; the high-frequency transformer in the closing operation control loop is a second high-frequency transformer; the first high-frequency transformer has a first primary coil, a first secondary coil, and a first primary auxiliary coil; the second high-frequency transformer has a second primary coil, a second secondary coil, and a second primary auxiliary coil; the first primary auxiliary coil of the first high-frequency transformer has one end grounded, and the other end connected to the anode of a tenth diode, the cathode of the tenth diode is connected to port 1 of a first switching power supply, the first switching power supply further has a port 2 and a ground port, which are grounded via the ground port, the port 2 of the first switching power supply is grounded via a fifth filter capacitor, and the port 2 of the first switching power supply is connected to a first voltage output terminal; the second primary auxiliary coil of the second high-frequency transformer has one end grounded, and the other end connected to the anode of a twentieth diode, the cathode of the twentieth diode is connected to port 1 of a second switching power supply, the second switching power supply further has a port 2 and a ground port, which are grounded via the ground port, the port 2 of the second switching power supply is grounded via a sixth filter capacitor, and the port 2 of the second switching power supply is connected to the second voltage output terminal.

[0014] Optionally, the quadruple voltage rectifier and filter circuit module of the opening operation control loop is a first quadruple voltage rectifier and filter circuit module; the quadruple voltage rectifier and filter circuit module of the closing operation control loop is a second quadruple voltage rectifier and filter circuit module; the first quadruple voltage rectifier and filter circuit module includes: a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a second electrolytic capacitor, a fifth diode, a sixth diode, a seventh diode and an eighth diode; one end of the first secondary coil of the first high-frequency transformer is connected to the first end of the second capacitor of the first quadruple voltage rectifier and filter circuit module and the first end of the third capacitor, and the first end of the first high-frequency transformer is connected to the first end of the second capacitor of the first high-frequency transformer. The other end of the secondary coil is connected to the anode of the fifth diode, the cathode of the sixth diode, the second end of the fourth capacitor and the first end of the fifth capacitor; the second end of the second capacitor is connected to the cathode of the fifth diode and the anode of the seventh diode; the second end of the third capacitor is connected to the anode of the sixth diode and the cathode of the eighth diode; the anode of the fifth diode is connected to the cathode of the sixth diode; the cathode of the seventh diode is connected to the first end of the fourth capacitor and the first end of the second electrolytic capacitor, and the anode of the eighth diode is connected to the second end of the fifth capacitor and the cathode of the second electrolytic capacitor. The first end of the fifth capacitor is connected to the second end of the fourth capacitor; the second quadruple voltage rectifier and filter circuit module includes: a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourth electrolytic capacitor, a fifteenth diode, a sixteenth diode, a seventeenth diode and an eighteenth diode; one end of the second secondary coil of the second high-frequency transformer is connected to the first end of the tenth capacitor of the second quadruple voltage rectifier and filter circuit module and the first end of the eleventh capacitor, and the other end of the second secondary coil of the second high-frequency transformer is connected to the positive electrode of the fifteenth diode, the negative electrode of the sixteenth diode, the first end of the twelfth capacitor and the second end of the The second end of the tenth capacitor is connected to the cathode of the fifteenth diode and the anode of the seventeenth diode; the second end of the eleventh capacitor is connected to the anode of the sixteenth diode and the cathode of the eighteenth diode; the anode of the fifteenth diode is connected to the cathode of the sixteenth diode; the cathode of the seventeenth diode is connected to the first end of the twelfth capacitor and the first end of the fourth electrolytic capacitor, the anode of the eighteenth diode is connected to the second end of the thirteenth capacitor and the second end of the fourth electrolytic capacitor, and the first end of the thirteenth capacitor is connected to the second end of the twelfth capacitor.

[0015] In a second aspect, the present invention provides a controller for controlling a control circuit for opening and closing a DC switch, comprising: CPU control algorithm module, used for parameter setting, sampling control and calculation; PWM output and power drive circuit module, used to provide PWM control waveform and drive circuit to the power conversion circuit module; A voltage and current sampling circuit module, used for voltage division and current shunting processing of the output of the quadruple voltage rectifier and filter circuit module; a thyristor trigger circuit module, configured to receive a trigger command from the CPU control algorithm module and perform trigger control on the thyristors in the opening operation control loop and the closing operation control loop; Protection circuit module, used to realize overcurrent, overvoltage and short circuit protection functions; A signal conditioning circuit module, used to filter and perform operational amplifier processing on the voltage and current output by the voltage and current sampling circuit module and the protection circuit module, and then convert them into voltage signals required by the analog-to-digital conversion chip; An A / D conversion circuit module, configured to perform high-frequency sampling on the voltage signal output by the signal conditioning circuit module; An auxiliary power supply circuit module, used to supply power to the signal conditioning circuit module and the thyristor trigger circuit module; The start-stop control circuit module is used to control the start or stop of the opening operation control circuit or the closing operation control circuit when the external environment is normal or faulty.

[0016] In a third aspect, the present invention provides a method for using a controller, based on the controller, comprising the following steps: Setting the output voltage, output current setting value and the upper temperature limit alarm value of the power switch in the power conversion circuit module through the CPU control algorithm module; The voltage and current sampling circuit module is used to divide the voltage output by the quadruple voltage rectifier and filter circuit module in the control circuit for opening and closing the DC switch and perform current shunting processing; Reading the sampled values ​​of the output voltage, output current and the temperature of the power switch in the power conversion circuit module through the CPU control algorithm module; After digital filtering is performed by the signal conditioning circuit module, short circuit abnormality judgment is performed by the CPU control algorithm module.

[0017] Optionally, in the short circuit abnormality judgment performed by the CPU control algorithm module: If there is a short circuit abnormality, the power switch in the power conversion circuit module is controlled to be disconnected through the PWM output and power drive circuit module, and then the short circuit current is sampled; If there is no short circuit abnormality and the output voltage exceeds the set value, the power switch in the power conversion circuit module is PWM controlled and adjusted by the PWM output and power drive circuit module, and the output voltage sampling value is judged by the CPU control algorithm module; If the output voltage does not exceed the set value and the output current exceeds the set value, the power switch in the power conversion circuit module is PWM controlled and adjusted by the PWM output and power drive circuit module, and the output current sampling value is judged by the CPU control algorithm module; If the output current does not exceed the set value and the temperature of the power switch in the power conversion circuit module exceeds the upper limit alarm value, the power switch in the power conversion circuit module is controlled to be disconnected through the PWM output and power drive circuit module, and then the output voltage, current and temperature of the power switch are sampled; If the temperature of the power switch does not exceed the upper alarm limit, PWM control adjustment is performed through the PWM output and power drive circuit module, and then the output voltage, current and temperature of the power switch are sampled.

[0018] In a fourth aspect, the present invention provides an electromagnetic repulsion mechanism, comprising an opening repulsion coil, a repulsion disk, a closing repulsion coil and an insulating pull rod, as well as a control circuit for opening and closing a DC switch and a controller; the opening repulsion coil and the closing repulsion coil are arranged opposite to each other, the repulsion disk is arranged between the opening repulsion coil and the closing repulsion coil, and the insulating pull rod passes through the repulsion disk and is fixedly connected to the repulsion disk; one end of the opening repulsion coil is connected to the negative pole of the first thyristor, and the other end of the opening repulsion coil is connected to the second output end of the opening operation control circuit; one end of the closing repulsion coil is connected to the negative pole of the second thyristor, and the other end of the closing repulsion coil is connected to the second output end of the closing operation control circuit.

[0019] In a fifth aspect, the present invention provides a method for using an electromagnetic repulsion mechanism, based on the electromagnetic repulsion mechanism, comprising the following steps: receiving a DC switch opening or closing operation instruction through the controller; The controller sends an operation instruction to the control circuit of the DC switch opening and closing, triggering the energy storage capacitor of the opening circuit to discharge the opening repulsion coil or the energy storage capacitor of the closing circuit to discharge the closing repulsion coil to form a pulse current, thereby pushing the repulsion disk to move at high speed to complete the opening or closing operation; The DC high voltage output current and voltage are collected by the controller.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a DC switch opening and closing control circuit to enable rapid opening and closing of the DC switch operating mechanism. This ensures that after a DC transmission equipment failure, a rapid energy dissipation channel is provided to the system, ensuring stable operation of the power system. This DC switch opening and closing control circuit improves the traditional control method for large power frequency transformers to a control method for small high-frequency transformers, resulting in miniaturization, ease of operation, maintenance, and low cost.

[0021] The controller of the present invention comprises a DC high-voltage output current and voltage feedback control circuit comprised of a voltage and current sampling circuit module, a signal conditioning circuit module, an A / D conversion circuit module, a CPU control algorithm module, and a PWM output and power drive circuit module. This circuit forms a closed-loop control system for the DC high-voltage output current and voltage. The controller's feedback control circuit adjusts the power conversion circuit module based on the output current and voltage set values, comparing them with the DC high-voltage output current and voltage sampled information obtained from the output terminal, thereby achieving control and stabilization of the DC high-voltage output current and voltage.

[0022] The modules of the controller are divided according to their functions. The above circuit modules are integrated on the internal circuit board of the controller. Signals are transmitted between modules using circuit board lines. This avoids electromagnetic interference caused by connecting independent modules with wires for signal transmission, which affects the normal operation of the controller and improves the reliability of product operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 This is a structural diagram of the DC high voltage control loop and controller of the present invention; Figure 2 This is the control logic diagram of the controller of the present invention; Figure 3 This is a topological structure diagram of the DC switch opening and closing operation control of the present invention; Among them, M1, the first EMI filter circuit module; M2, the first rectifier bridge module; M3, the first power conversion circuit module; M4, the first quadruple voltage rectifier filter circuit module; M5, the second EMI filter circuit module; M6, the second rectifier bridge module; M7, the second power conversion circuit module; M8, the second quadruple voltage rectifier filter circuit module; M9, the electromagnetic repulsion mechanism; S13, the opening repulsion coil; S14, the repulsion disk; S15, the closing repulsion coil; S16, the insulating pull rod; S1, the first port; S2, the second port; S3, the third port; S4, the fourth port; S5, the fifth port; S6, the sixth port; S7, the seventh port; S8, the eighth port; S9, the ninth port; S10, the tenth port; S1 1. 11th port; S12. 12th port; Q1. 1st air switch; Q2. 2nd air switch; R1. 1st resistor; R5. 5th resistor; L1. 1st inductor; L2. 2nd inductor; L3. 3rd inductor; L4. 4th inductor; CX1. 1st filter capacitor; CX2. 2nd filter capacitor; CX3. 3rd filter capacitor; CX4. 4th filter capacitor; CY1. 1st safety capacitor; CY2. 2nd safety capacitor; CY3. 3rd safety capacitor; CY4. 4th safety capacitor; GND1. 1st ground wire; GND2. 2nd ground wire; GND3. 3rd ground wire; GND4. 4th ground wire; GND5. 5th ground wire; GND6. 6th ground wire; GND7. 7th ground wire; GND8. 8th ground wire Eight ground wires; GND9, the ninth ground wire; GND10, the tenth ground wire; GND11, the eleventh ground wire; GND12, the twelfth ground wire; D1, the first diode; D2, the second diode; D3, the third diode; D4, the fourth diode; D5, the fifth diode; D6, the sixth diode; D7, the seventh diode; D8, the eighth diode; D10, the tenth diode; D11, the eleventh diode; D12, the twelfth diode; D13, the thirteenth diode; D14, the fourteenth diode; D20, the twentieth diode; C1, the first electrolytic capacitor; C6, the second electrolytic capacitor; C9, the third electrolytic capacitor; C14, the fourth electrolytic capacitor; SiC1, the first power switch; SiC2, the second power switch ; SiC3, third power switch; SiC4, fourth power switch; SiC5, fifth power switch; SiC6, sixth power switch; SiC7, seventh power switch; SiC8, eighth power switch; T1, first high-frequency transformer; T2, second high-frequency transformer; Np1, first primary coil; Ns1, first secondary coil; Nb1, first primary auxiliary coil; Np2, second primary coil; Ns2, second secondary coil; Nb2, second primary auxiliary coil; IC1, first switching power supply; IC2, second switching power supply; VCC1, first voltage output terminal; VCC2, second voltage output terminal; C8, fifth filter capacitor; C16, sixth filter capacitor; C2, second capacitor; C3, third capacitor;C4, the fourth capacitor; C5, the fifth capacitor; C10, the tenth capacitor; C11, the eleventh capacitor; C12, the twelfth capacitor; C13, the thirteenth capacitor; D15, the fifteenth diode; D16, the sixteenth diode; D17, the seventeenth diode; D18, the eighteenth diode; R2, the first energy storage capacitor charging resistor; R3, the first energy storage capacitor freewheeling resistor; R4, the first discharge resistor; R6, the second energy storage capacitor charging resistor; R7, the second energy storage capacitor freewheeling resistor; R8, the second discharge resistor; P1, the first node; P2, the second node Point; C7, opening circuit energy storage capacitor; C15, closing circuit energy storage capacitor; SCR1, first thyristor; SCR2, second thyristor; MOV1, first lightning arrester; MOV2, second lightning arrester; D9, first protection diode; D19, second protection diode; KX1, first two-position selector switch; KX2, second two-position selector switch; K1, first manual switch; K2, second manual switch; FJ1, first normally open relay; FJ2, first vacuum relay; FJ3, second normally open relay; FJ4, second vacuum relay. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0026] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0027] When an element is referred to as being “disposed on” another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being “connected to” another element, it can be directly connected to the other element or there may be an intervening element at the same time.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures. In the description of the present invention, it should be understood that the terms "comprise" and "include" indicate the presence of the described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their combinations.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] The present invention will be described in detail below with reference to the accompanying drawings.

[0031] A control circuit for opening and closing a DC switch according to the present invention includes: an opening operation control circuit, a closing operation control circuit, an opening energy storage capacitor discharge circuit, and a closing energy storage capacitor discharge circuit. The opening operation control circuit and the closing operation control circuit each include an air switch, an EMI (Electromagnetic Interference Filtering) filter circuit module, a rectifier bridge module, a power conversion circuit module, a high-frequency transformer, and a quadruple voltage rectifier filter circuit module, which are connected in sequence. The power conversion circuit module includes a power switch. The first output end of the opening operation control circuit is connected to a first thyristor SCR1 via a first energy storage capacitor charging resistor R2, and the first thyristor SCR1 is connected to the opening energy storage capacitor discharge circuit. The first output end of the closing operation control circuit is connected to a second thyristor SCR2 via a second energy storage capacitor charging resistor R6, and the second thyristor SCR2 is connected to the closing energy storage capacitor discharge circuit. The opening operation control circuit includes an opening circuit energy storage capacitor C7; the closing operation control circuit includes a closing circuit energy storage capacitor C15.

[0032] The control circuit for opening and closing the DC switch of the present invention can improve the traditional control method of a large-volume power frequency transformer into a new control method for a small-volume high-frequency transformer, and has the characteristics of miniaturization, easy operation, easy maintenance and low cost.

[0033] Example 1 A control circuit for opening and closing a DC switch in this embodiment includes: Opening operation control circuit, closing operation control circuit, opening energy storage capacitor discharge circuit and closing energy storage capacitor discharge circuit.

[0034] The control circuit for opening and closing the DC switch is electrically connected to an electromagnetic repulsion mechanism M9, which includes: an opening repulsion coil S13, a repulsion disk S14, a closing repulsion coil S15 and an insulating pull rod S16.

[0035] The tripping energy storage capacitor discharge circuit includes: The first two-position selector switch KX1, the first manual switch K1, the first normally open relay FJ1, the first discharge resistor R4, the first vacuum relay FJ2 and the DC power supply module (input AC220V, output DC24V).

[0036] The closing energy storage capacitor discharge circuit includes: The second two-position selector switch KX2, the second manual switch K2, the second normally open relay FJ3, the second discharge resistor R8, the second vacuum relay FJ4 and the DC power supply module (input AC220V, output DC24V).

[0037] The first vacuum relay FJ2 and the second vacuum relay FJ4 each have a switch terminal and a control terminal.

[0038] like Figure 3 As shown in Figure 1, the opening operation control circuit includes: The first air switch Q1, the first EMI filter circuit module M1, the first rectifier bridge module M2, the first power conversion circuit module M3, the first high-frequency transformer T1, the first quadruple voltage rectifier filter circuit module M4, the first energy storage capacitor charging resistor R2, the opening circuit energy storage capacitor C7, the first thyristor SCR1, the first protection diode D9, the first lightning arrester MOV1 and the first energy storage capacitor freewheeling resistor R3.

[0039] Among them, the first air switch Q1, the first EMI filter circuit module M1, the first rectifier bridge module M2, the first power conversion circuit module M3, the first high-frequency transformer T1 and the first quadruple voltage rectifier filter circuit module M4 are connected in sequence.

[0040] The first EMI filter circuit module M1 includes: a first resistor R1, a first filter capacitor CX1, a second filter capacitor CX2, a first inductor L1, a second inductor L2, a first safety capacitor CY1 and a second safety capacitor CY2.

[0041] The first rectifier bridge module M2 includes: a first electrolytic capacitor C1, a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4.

[0042] The first power conversion circuit module M3 includes: a first power switch SiC1, a second power switch SiC2, a third power switch SiC3 and a fourth power switch SiC4.

[0043] The first quadruple voltage rectifier and filter circuit module M4 includes: a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a second electrolytic capacitor C6, a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eighth diode D8.

[0044] The first high-frequency transformer T1 includes a first primary winding Np1, a first secondary winding Ns1, and a first primary auxiliary winding Nb1. The first primary auxiliary winding Nb1 of the first high-frequency transformer T1 is connected to a tenth diode D10, a first switching power supply IC1, and a fifth filter capacitor C8.

[0045] The closing operation control circuit includes: The second air switch Q2, the second EMI filter circuit module M5, the second rectifier bridge module M6, the second power conversion circuit module M7, the second high-frequency transformer T2, the second quadruple voltage rectifier filter circuit module M8, the second energy storage capacitor charging resistor R6, the closing circuit energy storage capacitor C15, the second thyristor SCR2, the second protection diode D19, the second lightning arrester MOV2 and the second energy storage capacitor freewheeling resistor R7.

[0046] The second EMI filter circuit module M5 includes: a fifth resistor R5, a third filter capacitor CX3, a fourth filter capacitor CX4, a third inductor L3, a fourth inductor L4, a third safety capacitor CY3 and a fourth safety capacitor CY4.

[0047] The second rectifier bridge module M6 includes: a third electrolytic capacitor C9, an eleventh diode D11, a twelfth diode D12, a thirteenth diode D13 and a fourteenth diode D14.

[0048] The second power conversion circuit module M7 includes: a fifth power switch SiC5, a sixth power switch SiC6, a seventh power switch SiC7 and an eighth power switch SiC8.

[0049] The second quadruple voltage rectifier and filter circuit module M8 includes: a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourth electrolytic capacitor C14, a fifteenth diode D15, a sixteenth diode D16, a seventeenth diode D17 and an eighteenth diode D18.

[0050] The second high-frequency transformer T2 includes a second primary winding Np2, a second secondary winding Ns2, and a second primary auxiliary winding Nb2. The second primary auxiliary winding Nb2 of the second high-frequency transformer T2 is connected to a twentieth diode D20, a second switching power supply IC2, and a sixth filter capacitor C16.

[0051] The first lightning arrester MOV1 and the second lightning arrester MOV2 are both used to protect the thyristor.

[0052] Specifically, in the opening operation control loop, the first air switch Q1 is a double-pole switch, and the two poles of the first air switch Q1 are connected to the first port S1 and the second port S2 respectively.

[0053] The other end of the first air switch Q1 is connected to both ends of the first resistor R1 of the first EMI filter circuit module M1. The two ends of the first resistor R1 are respectively connected to both ends of the first filter capacitor CX1. The two ends of the first filter capacitor CX1 are respectively connected to the first end of the first inductor L1 and the first end of the second inductor L2. The second end of the first inductor L1 and the second end of the second inductor L2 are respectively connected to both ends of the second filter capacitor CX2. The two ends of the second filter capacitor CX2 are respectively connected to the first end of the first safety capacitor CY1 and the second end of the second safety capacitor CY2. The second end of the first safety capacitor CY1 is connected to the first end of the second safety capacitor CY2, and the second end of the first safety capacitor CY1 and the first end of the second safety capacitor CY2 are both connected to the first ground line GND1.

[0054] The first end of the first safety capacitor CY1 is connected to the anode of the first diode D1 of the first rectifier bridge module M2 and the cathode of the third diode D3. The second end of the second safety capacitor CY2 is connected to the anode of the second diode D2 and the cathode of the fourth diode D4. The cathode of the first diode D1 is connected to the cathode of the second diode D2 and the first end of the first electrolytic capacitor C1. The anode of the third diode D3 is connected to the anode of the fourth diode D4 and the second end of the first electrolytic capacitor C1.

[0055] The first end of the first electrolytic capacitor C1 is connected to the drain of the first power switch SiC1 and the drain of the second power switch SiC2 of the first power conversion circuit module M3. The second end of the first electrolytic capacitor C1 is connected to the source of the third power switch SiC3 and the source of the fourth power switch SiC4. The source of the first power switch SiC1 is connected to the drain of the third power switch SiC3 and the first end of the first primary winding Np1 of the first high-frequency transformer T1. The source of the second power switch SiC2 is connected to the drain of the fourth power switch SiC4 and the second end of the first primary winding Np1 of the first high-frequency transformer T1.

[0056] The first switching power supply IC1 and the second switching power supply IC2 each have a first port, a second port, and a ground port.

[0057] One end of the first primary auxiliary winding Nb1 of the first high-frequency transformer T1 is connected to the fourth ground line GND4, and the other end is connected to the anode of the tenth diode D10. The cathode of the tenth diode D10 is connected to port 1 of the first switching power supply IC1. The first switching power supply IC1 has a ground port and is connected to the second ground line GND2 through the ground port. Port 2 of the first switching power supply IC1 is connected to the first end of the fifth filter capacitor C8, and port 2 of the first switching power supply IC1 is connected to the first voltage output terminal VCC1. The second end of the fifth filter capacitor C8 is connected to the third ground line GND3.

[0058] One end of the first secondary winding Ns1 of the first high-frequency transformer T1 is connected to the first end of the second capacitor C2 and the first end of the third capacitor C3 of the first quadruple voltage rectifier and filter circuit module M4. The other end of the first secondary winding Ns1 of the first high-frequency transformer T1 is connected to the anode of the fifth diode D5, the cathode of the sixth diode D6, the second end of the fourth capacitor C4, and the first end of the fifth capacitor C5. The second end of the second capacitor C2 is connected to the cathode of the fifth diode D5 and the anode of the seventh diode D7. The second end of the third capacitor C3 is connected to the anode of the sixth diode D6 and the cathode of the eighth diode D8. The anode of the fifth diode D5 is connected to the cathode of the sixth diode D6.

[0059] The cathode of the seventh diode D7 is connected to the first end of the fourth capacitor C4 and the first end of the second electrolytic capacitor C6. The anode of the eighth diode D8 is connected to the second end of the fifth capacitor C5 and the second end of the second electrolytic capacitor C6. The first end of the fifth capacitor C5 is connected to the second end of the fourth capacitor C4.

[0060] The first end of the second electrolytic capacitor C6 is connected to the first end of the first energy storage capacitor charging resistor R2. The second end of the first energy storage capacitor charging resistor R2 is connected to a first node P1. The first node P1 is respectively connected to the first end of the opening circuit energy storage capacitor C7, the positive electrode of the first thyristor SCR1, the negative electrode of the first protection diode D9, and the first end of the first lightning arrester MOV1. The negative electrode of the first thyristor SCR1, the positive electrode of the first protection diode D9, and the second end of the first lightning arrester MOV1 are connected to the first end of the first energy storage capacitor freewheeling resistor R3 and the first input end of the electromagnetic repulsion mechanism M9. The second end of the second electrolytic capacitor C6 is connected to the second end of the opening circuit energy storage capacitor C7, the fifth ground line GND5, the second end of the first energy storage capacitor freewheeling resistor R3, and the second input end of the electromagnetic repulsion mechanism M9.

[0061] In the opening energy storage capacitor discharge circuit, the first normally open relay FJ1 has a switch end and a control end.

[0062] One end of the first discharge resistor R4 of the tripping energy storage capacitor discharge circuit is connected to the first node P1, and the other end is connected to the switch of the first vacuum relay FJ2. The other end of the switch of the first vacuum relay FJ2 is connected to the sixth ground wire GND6. One end of the control end of the first vacuum relay FJ2 is connected to the sixth port S6, and the other end is respectively connected to one end of the switch end of the first manual switch K1 and the first normally open relay FJ1; the other end of the switch end of the first normally open relay FJ1 is connected to the fifth port S5.

[0063] The control terminal of the first normally-open relay FJ1 is a coil. The controller remotely controls the energized state of the control terminal of the first normally-open relay FJ1. When the switch selects the fifth port S5, the controller energizes the control terminal of the first normally-open relay FJ1, closing the switch terminal of the first normally-open relay FJ1 and remotely discharging the energy storage capacitor C7 in the trip circuit.

[0064] The other end of the first manual switch K1 is connected to the fourth port S4, and the fifth port S5 and the fourth port S4 are set at the switch selection position of the first two-position selection switch KX1. The other end of the first two-position selection switch KX1 is connected to the third port S3.

[0065] The input end of the DC power supply module of the opening energy storage capacitor discharge circuit is connected to the external AC220V, the output end is DC24V, the positive end of the output end is connected to the third port S3, and the negative end is connected to the sixth port S6.

[0066] In the closing operation control circuit: The second air switch Q2 is a double-pole switch, and the two poles of the second air switch Q2 are connected to the seventh port S7 and the eighth port S8 respectively.

[0067] The other end of the second air switch Q2 is connected to the ends of the fifth resistor R5 of the second EMI filter circuit module M5. The ends of the fifth resistor R5 are respectively connected to the ends of the third filter capacitor CX3. The ends of the third filter capacitor CX3 are respectively connected to the first end of the third inductor L3 and the first end of the fourth inductor L4. The second end of the third inductor L3 and the second end of the fourth inductor L4 are respectively connected to the ends of the fourth filter capacitor CX4. The ends of the fourth filter capacitor CX4 are respectively connected to the first end of the third safety capacitor CY3 and the second end of the fourth safety capacitor CY4. The second end of the third safety capacitor CY3 is connected to the first end of the fourth safety capacitor CY4, and the second end of the third safety capacitor CY3 and the first end of the fourth safety capacitor CY4 are both connected to the seventh ground line GND7.

[0068] The first end of the third safety capacitor CY3 is connected to the anode of the eleventh diode D11 and the cathode of the thirteenth diode D13 of the second rectifier bridge module M6. The second end of the fourth safety capacitor CY4 is connected to the anode of the twelfth diode D12 and the cathode of the fourteenth diode D14. The cathode of the eleventh diode D11 is connected to the cathode of the twelfth diode D12 and the first end of the third electrolytic capacitor C9. The anode of the thirteenth diode D13 is connected to the anode of the fourteenth diode D14 and the second end of the third electrolytic capacitor C9.

[0069] The first end of the third electrolytic capacitor C9 is connected to the drain of the fifth power switch SiC5 and the drain of the sixth power switch SiC6 of the second power conversion circuit module M7. The second end of the third electrolytic capacitor C9 is connected to the source of the seventh power switch SiC7 and the source of the eighth power switch SiC8. The source of the fifth power switch SiC5 is connected to the drain of the seventh power switch SiC7 and the first end of the second primary winding Np2 of the second high-frequency transformer T2. The source of the sixth power switch SiC6 is connected to the drain of the eighth power switch SiC8 and the second end of the second primary winding Np2 of the second high-frequency transformer T2.

[0070] One end of the second primary auxiliary winding Nb2 of the second high-frequency transformer T2 is connected to the tenth ground line GND10, and the other end is connected to the anode of the twentieth diode D20. The cathode of the twentieth diode D20 is connected to the first port of the second switching power supply IC2. The second switching power supply IC2 has a ground port. The ground port of the second switching power supply IC2 is connected to the eighth ground line GND8. The second port of the second switching power supply IC2 is connected to the first end of the sixth filter capacitor C16, and the second port of the second switching power supply IC2 is connected to the second voltage output terminal VCC2. The second end of the sixth filter capacitor C16 is connected to the ninth ground line GND9.

[0071] One end of the second secondary winding Ns2 of the second high-frequency transformer T2 is connected to the first end of the tenth capacitor C10 and the first end of the eleventh capacitor C11 of the second quadruple voltage rectifier and filter circuit module M8. The other end of the second secondary winding Ns2 of the second high-frequency transformer T2 is connected to the anode of the fifteenth diode D15, the cathode of the sixteenth diode D16, the second end of the twelfth capacitor C12, and the first end of the thirteenth capacitor C13. The second end of the tenth capacitor C10 is connected to the cathode of the fifteenth diode D15 and the anode of the seventeenth diode D17. The second end of the eleventh capacitor C11 is connected to the anode of the sixteenth diode D16 and the cathode of the eighteenth diode D18. The anode of the fifteenth diode D15 and the cathode of the sixteenth diode D16 are connected.

[0072] The cathode of the seventeenth diode D17 is connected to the first end of the twelfth capacitor C12 and the first end of the fourth electrolytic capacitor C14, the anode of the eighteenth diode D18 is connected to the second end of the thirteenth capacitor C13 and the second end of the fourth electrolytic capacitor C14, and the first end of the thirteenth capacitor C13 is connected to the second end of the twelfth capacitor C12.

[0073] The first end of the fourth electrolytic capacitor C14 is connected to the first end of the second energy storage capacitor charging resistor R6. The second end of the second energy storage capacitor charging resistor R6 is connected to the second node P2. The second node P2 is respectively connected to the first end of the closing circuit energy storage capacitor C15, the positive electrode of the second thyristor SCR2, the negative electrode of the second protection diode D19, and the first end of the second lightning arrester MOV2. The negative electrode of the second thyristor SCR2, the positive electrode of the second protection diode D19, and the second end of the second lightning arrester MOV2 are connected to the first end of the second energy storage capacitor freewheeling resistor R7 and the third input end of the electromagnetic repulsion mechanism M9. The second end of the fourth electrolytic capacitor C14 is connected to the second end of the closing circuit energy storage capacitor C15, the eleventh ground line GND11, the second end of the second energy storage capacitor freewheeling resistor R7, and the fourth input end of the electromagnetic repulsion mechanism M9.

[0074] In the closing energy storage capacitor discharge circuit, the second normally open relay FJ3 has a switch end and a control end.

[0075] One end of the second discharge resistor R8 in the closing energy storage capacitor discharge circuit is connected to the second node P2, and the other end is connected to the switch of the second vacuum relay FJ4. The other end of the switch of the second vacuum relay FJ4 is connected to the twelfth ground line GND12. One end of the control terminal of the second vacuum relay FJ4 is connected to the twelfth port S12, and the other end is respectively connected to one end of the second manual switch K2 and one end of the switch terminal of the second normally-open relay FJ3. The other end of the switch terminal of the second normally-open relay FJ3 is connected to the eleventh port S11.

[0076] The control terminal of the second normally-open relay FJ3 is a coil. The controller remotely controls the energized state of the control terminal of the second normally-open relay FJ3. When the switch selects the eleventh port S11, the controller energizes the control terminal of the second normally-open relay FJ3, closing the switch terminal of the second normally-open relay FJ3 and remotely discharging the energy storage capacitor C15 in the closing circuit.

[0077] The other end of the second manual switch K2 is connected to the tenth port S10, the eleventh port S11 and the tenth port S10 are set at the switch selection position of the second two-position selection switch KX2, and the other end of the second two-position selection switch KX2 is connected to the ninth port S9.

[0078] The input end of the DC power supply module of the closing energy storage capacitor discharge circuit is connected to the external AC220V, the output end is DC24V, the positive end of the output end is connected to the ninth port S9, and the negative end is connected to the twelfth port S12.

[0079] The electromagnetic repulsion mechanism of a DC switch of the present invention includes an opening repulsion coil S13, a repulsion disk S14, a closing repulsion coil S15, an insulating pull rod S16, a control circuit for opening and closing the DC switch, a controller, an energy supply system and a discharge device.

[0080] The insulating rod S16 passes through the repulsive disk S14 and is fixedly connected to the repulsive disk S14 , and the other end of the insulating rod S16 is connected to the vacuum interrupter.

[0081] An opening repulsion coil S13 and a closing repulsion coil S15 are sleeved on the insulating pull rod S16, and the opening repulsion coil S13 and the closing repulsion coil S15 are arranged opposite to each other.

[0082] The opening repulsion coil S13 has a first input terminal and a second input terminal of the electromagnetic repulsion mechanism M9, and the closing repulsion coil S15 has a third input terminal and a fourth input terminal of the electromagnetic repulsion mechanism M9.

[0083] The controller receives the DC switch opening or closing operation instructions of the upper-level controllable self-recovery energy dissipation device control and protection system. When the opening trigger conditions are met, the operation instructions are sent to the opening operation control circuit, triggering the opening circuit energy storage capacitor C7 to discharge the opening repulsion coil S13 to form a pulse current. This current generates a pulse magnetic field around the opening repulsion coil S13. The repulsion disk S14 forms an induced eddy current due to the action of the pulse magnetic field. The direction of the eddy current is opposite to the direction of the current in the opening repulsion coil S13, generating a huge electromagnetic repulsive force between the opening repulsion coil S13 and the repulsion disk S14, pushing the repulsion disk S14 to move at high speed, thereby completing the opening operation.

[0084] When the closing trigger conditions are met, an operation instruction is sent to the closing operation control circuit, triggering the closing circuit energy storage capacitor C15 to discharge the closing repulsion coil S15 to form a pulse current. This current generates a pulse magnetic field around the closing repulsion coil S15. The repulsion disk S14 forms an induced eddy current due to the action of the pulse magnetic field. The direction of the eddy current is opposite to the direction of the current in the closing repulsion coil S15, generating a huge electromagnetic repulsive force between the closing repulsion coil S15 and the repulsion disk S14, pushing the repulsion disk S14 to move at high speed, thereby completing the closing operation.

[0085] The high-frequency AC voltage in the opening operation control loop is transformed by the first primary auxiliary winding Nb1 of the first high-frequency transformer T1, rectified by the tenth diode D10, and then sent to the first port of the first switching power supply IC1.

[0086] A DC5V to DC15V voltage is output from the second port of the first switching power supply IC1 and is filtered by the fifth filter capacitor C8 to supply power to the signal conditioning circuit module and the thyristor trigger circuit module.

[0087] The high-frequency AC voltage in the closing operation control loop is transformed by the second primary auxiliary winding Nb2 of the second high-frequency transformer T2, rectified by the twentieth diode D20, and then fed into the first port of the second switching power supply IC2.

[0088] A DC5V to DC15V voltage is output from the second port of the second switching power supply IC2 and is filtered by the sixth filter capacitor C16 to supply power to the signal conditioning circuit module and the thyristor trigger circuit module.

[0089] At the same time, the controller collects the DC high-voltage output current and voltage to achieve the purpose of controlling and stabilizing the output current and voltage.

[0090] The energy supply system is used to supply energy to the controller.

[0091] The discharge device consists of an opening energy storage capacitor discharge circuit and a closing energy storage capacitor discharge circuit, which are used to ensure the safety of the DC switch high-voltage output circuit during maintenance and debugging or abnormal conditions. It has two modes: manual control discharge and automatic control discharge. Before maintenance or in abnormal conditions, the coil of the vacuum relay (the first vacuum relay FJ2 or the second vacuum relay FJ4) in the discharge circuit (the opening energy storage capacitor discharge circuit or the closing energy storage capacitor discharge circuit) is energized to control the connection of the discharge circuit, thereby discharging the opening energy storage capacitor and the closing energy storage capacitor.

[0092] Example 2 like Figure 3 The figure shows a method for controlling the opening and closing operations of a control circuit for opening and closing a DC switch.

[0093] The opening operation control method includes the following steps: An AC220V industrial frequency input voltage is connected between the first port S1 and the second port S2. After EMI filtering by the first EMI filter circuit module M1, the voltage enters the first rectifier bridge module M2 for rectification and filtering to output a DC high voltage.

[0094] The first power conversion circuit module M3 converts the front-end DC power into high-frequency AC power, which is then boosted by the first high-frequency transformer T1 and sent to the first four-fold voltage rectifier and filter circuit module M4 for further boosting. It then outputs a stable DC high voltage to charge the trip circuit energy storage capacitor C7.

[0095] The controller controls the first power conversion circuit module M3 to control the charging voltage of the opening circuit energy storage capacitor C7. After the controller receives the opening operation command from the control and protection system and the opening circuit energy storage capacitor C7 meets the triggering conditions, it controls the first thyristor SCR1 to turn on.

[0096] The energy storage capacitor C7 of the opening circuit discharges the opening repulsion coil S13 to form a pulse current, which generates a pulse magnetic field around the opening repulsion coil S13. The repulsion disk S14 forms an induced eddy current due to the action of the pulse magnetic field. The direction of the eddy current is opposite to the direction of the current in the opening repulsion coil S13, and a huge electromagnetic repulsive force is generated between the opening repulsion coil S13 and the repulsion disk S14, which pushes the repulsion disk S14 to move at high speed to complete the opening operation.

[0097] The closing operation control method includes the following steps: The AC220V industrial frequency input voltage is connected between the seventh port S7 and the eighth port S8. After EMI filtering by the second EMI filter circuit module M5, the voltage enters the second rectifier bridge module M6 for rectification and filtering to output a DC voltage.

[0098] The second power conversion circuit module M7 converts the front-end DC power into high-frequency AC power, which is then boosted by the second high-frequency transformer T2 and sent to the second four-fold voltage rectifier and filter circuit module M8 for further boosting. It then outputs a stable DC high voltage to charge the closing circuit energy storage capacitor C15.

[0099] The controller controls the second power conversion circuit module M7 to control the charging voltage of the closing circuit energy storage capacitor C15. After the controller receives the closing operation command from the control and protection system and the closing circuit energy storage capacitor C15 meets the triggering conditions, the controller controls the second thyristor SCR2 to turn on.

[0100] The closing circuit energy storage capacitor C15 discharges the closing repulsion coil S15 to form a pulse current, which generates a pulse magnetic field around the closing repulsion coil S15. The repulsion disk S14 forms an induced eddy current due to the action of the pulse magnetic field. The direction of the eddy current is opposite to the direction of the current in the closing repulsion coil S15, generating a huge electromagnetic repulsive force between the closing repulsion coil S15 and the repulsion disk S14, pushing the repulsion disk S14 to move at high speed to complete the closing operation.

[0101] In the opening operation control circuit: The third port S3 is connected to the positive pole of DC24V, and the sixth port S6 is connected to the negative pole of DC24V.

[0102] The two positions of the first two-position selection switch KX1 are divided into the local manual energy storage capacitor discharge operation selection at the fourth port S4 position and the remote energy storage capacitor discharge operation selection at the fifth port S5 position.

[0103] When the first two-position selection switch KX1 selects the fourth port S4 position, the first manual switch K1 is manually controlled to close, the coil of the first vacuum relay FJ2 is energized, the contacts of the first vacuum relay FJ2 are energized, and the trip circuit energy storage capacitor C7 is grounded after passing through the first discharge resistor R4, thereby realizing rapid discharge of the trip circuit energy storage capacitor C7.

[0104] When the first two-position selection switch KX1 selects the fifth port S5 position, the controller remotely controls the first normally open relay FJ1 contact to close, the first vacuum relay FJ2 coil is energized, the first vacuum relay FJ2 contact is closed, and the trip circuit energy storage capacitor C7 is grounded after passing through the first discharge resistor R4, thereby realizing rapid discharge of the trip circuit energy storage capacitor C7.

[0105] In the opening operation control loop, the first primary auxiliary winding Nb1 of the first high-frequency transformer T1, the tenth diode D10, the first switching power supply IC1 and the fifth filter capacitor C8 form an auxiliary power circuit module.

[0106] The high-frequency AC voltage in the opening operation control loop is transformed by the first primary auxiliary winding Nb1 of the first high-frequency transformer T1, rectified by the tenth diode D10, and fed into the first port of the first switching power supply IC1. A DC5V to DC15V voltage is output from the second port of the first switching power supply IC1, filtered by the fifth filter capacitor C8, and used to power the signal conditioning circuit module and the thyristor trigger circuit module.

[0107] In the closing operation control circuit: The ninth port S9 is connected to the positive pole of DC24V, and the twelfth port S12 is connected to the negative pole of DC24V. The two positions of the second two-position selector switch KX2 are divided into the tenth port S10 position for local manual energy storage capacitor discharge operation selection and the eleventh port S11 position for remote energy storage capacitor discharge operation selection. When the second two-position selector switch KX2 is selected to the tenth port S10 position, the second manual switch K2 is manually controlled to close, the second vacuum relay FJ4 coil is energized, the second vacuum relay FJ4 contacts are attracted, and the closing circuit energy storage capacitor C15 is connected to ground after passing through the second discharge resistor R8, achieving rapid discharge of the closing circuit energy storage capacitor C15. When the second two-position selector switch KX2 is selected to the eleventh port S11 position, the controller remotely controls the second normally open relay FJ3 contacts to close, the second vacuum relay FJ4 coil is energized, the second vacuum relay FJ4 contacts are attracted, and the closing circuit energy storage capacitor C15 is connected to ground after passing through the second discharge resistor R8, achieving rapid discharge of the closing circuit energy storage capacitor C15.

[0108] In the closing operation control loop, the second primary auxiliary winding Nb2 of the second high-frequency transformer T2, the twentieth diode D20, the second switching power supply IC2 and the sixth filter capacitor C16 constitute an auxiliary power supply circuit module.

[0109] The high-frequency AC voltage in the closing operation control loop is transformed by the second primary auxiliary winding Nb2 of the second high-frequency transformer T2, rectified by the twentieth diode D20, and fed into the first port of the second switching power supply IC2. A DC5V to DC15V voltage is output from the second port of the second switching power supply IC2, filtered by the sixth filter capacitor C16, and used to power the signal conditioning circuit module and the thyristor trigger circuit module.

[0110] exist Figure 3 In the opening operation control loop, the first ground wire GND1, the second ground wire GND2, the third ground wire GND3, and the fourth ground wire GND4 on the primary side of the first high-frequency transformer T1 are connected to the same ground potential, and the fifth ground wire GND5 and the sixth ground wire GND6 on the secondary side of the first high-frequency transformer T1 are connected to the same ground potential. In the closing operation control loop, the seventh ground wire GND7, the eighth ground wire GND8, the ninth ground wire GND9, and the tenth ground wire GND10 on the primary side of the second high-frequency transformer T2 are connected to the same ground potential, and the eleventh ground wire GND11 and the twelfth ground wire GND12 on the secondary side of the second high-frequency transformer T2 are connected to the same ground potential.

[0111] Example 3 like Figure 1 As shown, in this embodiment, the controller includes: CPU control algorithm module, PWM output and power drive circuit module, voltage and current sampling circuit module, signal conditioning circuit module, A / D conversion circuit module, thyristor trigger circuit module, protection circuit module, auxiliary power supply circuit module and start-stop control circuit module.

[0112] The modules of the controller are divided according to their functions. The above circuit modules are integrated on the internal circuit board of the controller. Signals are transmitted between modules using circuit board lines. This avoids electromagnetic interference caused by connecting independent modules with wires for signal transmission, which affects the normal operation of the controller and improves the reliability of product operation.

[0113] Among them, the auxiliary power supply circuit module includes the first primary auxiliary coil Nb1, the tenth diode D10, the first switching power supply IC1, and the fifth filter capacitor C8 of the first high-frequency transformer T1 in the opening operation control loop, and the second primary auxiliary coil Nb2, the twentieth diode D20, the second switching power supply IC2 and the sixth filter capacitor C16 of the second high-frequency transformer T2 in the closing operation control loop.

[0114] The CPU control algorithm module can perform sampling control, phase-shift pulse generation, power regulation, overvoltage protection, overcurrent protection, filtering algorithm, full-bridge phase-shift algorithm, parameter configuration and data packaging.

[0115] Figure 1 The power conversion circuit module in Figure 3 The first power conversion circuit module M3 or the second power conversion circuit module M7; Figure 1 The high frequency transformer in Figure 3 The first high-frequency transformer T1 or the second high-frequency transformer T2.

[0116] The CPU control algorithm module is in communication with the A / D conversion circuit module, the thyristor trigger circuit module, the start / stop control circuit module, and the PWM output and power drive circuit module. The start / stop control circuit module processes the signals generated by external start / stop operations and sends them to the CPU control algorithm module. The CPU control algorithm module sends power switch control commands to the PWM output and power drive circuit module. Based on the power switch control commands sent by the CPU control algorithm module, the PWM output and power drive circuit module provides PWM control waveforms and drive circuits to the power conversion circuit module (i.e., the first power conversion circuit module M3 in the opening control loop or the second power conversion circuit module M7 in the closing control loop) to regulate the output voltage.

[0117] Specifically, the main chip of the CPU control algorithm module adopts the FPGA chip model XC6SLX100T of XILINX company.

[0118] The PWM output and power drive circuit module is used to provide PWM control waveforms and drive circuits to the power switches in the power conversion circuit module.

[0119] The voltage and current sampling circuit module is used to perform voltage division and current shunting on the DC high voltage output by the quadruple voltage rectifier and filter circuit module, converting it into lower voltage and current for easy sampling.

[0120] The signal conditioning circuit module is used to filter and perform operational amplifier processing on the voltage and current output by the voltage and current sampling circuit module and the protection circuit module, and then convert them into the voltage signal required by the analog-to-digital conversion chip.

[0121] The A / D conversion circuit module is used to perform 100KHz frequency sampling on the voltage signal output by the signal conditioning circuit module.

[0122] Optionally, the A / D conversion circuit module uses an analog-to-digital conversion chip AD7768BSTZ for data acquisition.

[0123] The thyristor trigger circuit module receives the trigger command from the CPU control algorithm module and performs trigger control on the first thyristor SCR1 in the opening operation control loop or the second thyristor SCR2 in the closing operation control loop.

[0124] Protection circuit module, used to realize overcurrent, overvoltage and short circuit protection functions.

[0125] The auxiliary power supply circuit module is used to supply power to the signal conditioning circuit module and the thyristor trigger circuit module.

[0126] The start-stop control circuit module is used to control the start or stop of the opening operation control circuit or the closing operation control circuit when the external state is normal or faulty.

[0127] like Figure 1 The figure shows the DC high-voltage control circuit and controller structure. The input AC220V voltage passes through the EMI filter circuit module, then through the rectifier bridge module to output DC voltage. The power conversion circuit module converts the front-end DC power into high-frequency AC power. The high-frequency AC voltage is then boosted by the high-frequency transformer and sent to the quadruple voltage rectifier filter circuit module for further boosting, ultimately outputting a stable DC high voltage.

[0128] Among them, the rectifier bridge module adopts a single-phase bridge rectifier filter circuit.

[0129] The controller performs PWM control on the power switches in the power conversion circuit module and forms a DC high-voltage output current and voltage feedback control circuit, forming a closed-loop control system with the DC high-voltage output current and voltage. The DC high-voltage output current and voltage feedback control circuit includes a voltage and current sampling circuit module, a signal conditioning circuit module, an A / D conversion circuit module, a CPU control algorithm module, and a PWM output and power drive circuit module. Based on the output voltage and current set values, the controller, along with the output voltage and current sampling information obtained from the output terminal, feeds this information back to the CPU control algorithm module after passing through the controller's voltage and current sampling circuit module, signal conditioning circuit module, and A / D conversion circuit module. The CPU control algorithm module then adjusts the power conversion circuit module through the PWM output and power drive circuit modules to achieve the goal of controlling and stabilizing the output voltage and current.

[0130] Figure 2 This is a logic diagram of the controller CPU control algorithm. A method for using the controller includes the following steps: The controller starts the program after power-on, and sets the output voltage, output current setpoints, and the power switch SiC temperature upper limit alarm value through the CPU control algorithm module.

[0131] The voltage and current sampling circuit module is used to divide the voltage and current output by the quadruple voltage rectifier filter circuit module in the control circuit of the DC switch opening and closing.

[0132] The protection circuit module is used to collect the temperature of the power switch in the power conversion circuit module. The CPU control algorithm module is used to read the sampled values ​​of the output voltage, output current and the temperature of the power switch in the power conversion circuit module.

[0133] After digital filtering by the signal conditioning circuit module in the controller, short circuit abnormality judgment is performed through the CPU control algorithm module.

[0134] If there is a short circuit abnormality, the power switch in the power conversion circuit module is controlled to be disconnected through the PWM output and the power drive circuit module, and then the short circuit current is sampled.

[0135] If there is no short circuit abnormality, determine whether the output voltage exceeds the set value. If it exceeds the set value, perform PWM control and adjustment on the power switch in the power conversion circuit module through the PWM output and power drive circuit module, and then judge the output voltage sampling value through the CPU control algorithm module.

[0136] If the output voltage does not exceed the set value, determine whether the output current exceeds the set value. If it exceeds the set value, the power switch in the power conversion circuit module is PWM controlled and adjusted through the PWM output and power drive circuit module, and then the output current sampling value is judged through the CPU control algorithm module.

[0137] If the output current does not exceed the set value, it is determined whether the temperature of the power switch in the power conversion circuit module exceeds the upper limit alarm value. If it exceeds the upper limit alarm value, the power switch in the power conversion circuit module is controlled to be disconnected through the PWM output and the power drive circuit module, and then the output voltage, current and temperature of the power switch are sampled.

[0138] If the temperature of the power switch does not exceed the upper alarm value, PWM control adjustment is performed through the PWM output and power drive circuit module, and then the output voltage, current and temperature of the power switch are sampled.

[0139] By repeating the above steps to perform program judgment and power adjustment, the purpose of controlling and stabilizing the output voltage and current can be achieved.

[0140] Example 4 The closing circuit energy storage capacitor C15 of the present invention is connected to the closing energy storage capacitor discharge circuit, and the opening circuit energy storage capacitor C7 is connected to the opening energy storage capacitor discharge circuit.

[0141] Both the opening energy storage capacitor discharge circuit and the closing energy storage capacitor discharge circuit have two switchable selection functions: local manual control and remote automatic control, ensuring the safety of product maintenance and debugging.

[0142] When the remote automatic control mode is selected, the opening energy storage capacitor and the closing energy storage capacitor are automatically discharged when the equipment stops running, avoiding human negligence during maintenance that may cause the opening energy storage capacitor and the closing energy storage capacitor to be energized. Or when debugging and maintenance are required, the upper computer remotely controls the discharge of the opening energy storage capacitor and the closing energy storage capacitor to ensure personal safety.

[0143] The on-site manual control mode can ensure that the energy storage capacitors are discharged completely and the product and personnel safety is guaranteed by manually controlling the discharge of the opening and closing energy storage capacitors when the controller fails or the controller fails to remotely control the discharge of the opening and closing energy storage capacitors, resulting in residual voltage in the energy storage capacitors. On the one hand, the DC switch can quickly complete the opening or closing operation, ensuring that after a failure of the DC transmission equipment, a channel for energy discharge can be quickly provided to the system to ensure stable operation of the power system. On the other hand, the controller has a DC high-voltage output current and voltage feedback control circuit, which forms a closed-loop control system with the DC high-voltage output current and voltage. According to the output current and voltage set values, they are compared with the DC high-voltage output current and voltage sampling information obtained from the output end, and the power conversion circuit module is adjusted through the feedback control circuit of the controller to achieve the purpose of controlling and stabilizing the DC high-voltage output current and voltage.

[0144] Unless otherwise specified, the device components involved in the above embodiments are all conventional device components, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limiting. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A control circuit for opening and closing a DC switch, characterized in that: include: An opening operation control circuit, a closing operation control circuit, an opening energy storage capacitor discharge circuit and a closing energy storage capacitor discharge circuit; the opening operation control circuit and the closing operation control circuit both include an air switch, an EMI filter circuit module, a rectifier bridge module, a power conversion circuit module, a high-frequency transformer and a four-fold voltage rectifier filter circuit module connected in sequence; the power conversion circuit module has a power switch; the first output end of the opening operation control circuit is connected to a first thyristor through a first energy storage capacitor charging resistor, and the first thyristor is connected to the opening energy storage capacitor discharge circuit; the first output end of the closing operation control circuit is connected to a second thyristor through a second energy storage capacitor charging resistor, and the second thyristor is connected to the closing energy storage capacitor discharge circuit; the opening operation control circuit has an opening circuit energy storage capacitor; the closing operation control circuit has a closing circuit energy storage capacitor.

2. A DC switch opening and closing control circuit according to claim 1, characterized in that: The quadruple voltage rectifier and filter circuit modules of the opening operation control loop and the closing operation control loop both have a first output end and a second output end; the first output end of the opening operation control loop is connected to a first node through a first energy storage capacitor charging resistor, and the first node is connected to the first thyristor; the first output end of the closing operation control loop is connected to a second node through a second energy storage capacitor charging resistor, and the second node is connected to the second thyristor.

3. A DC switch opening and closing control circuit according to claim 2, characterized in that: The second output end of the closing operation control loop is connected to the second node through the closing circuit energy storage capacitor, and the second output end of the closing operation control loop is grounded; the second output end of the opening operation control loop is connected to the first node through the opening circuit energy storage capacitor, and the second output end of the opening operation control loop is grounded.

4. A DC switch opening and closing control circuit according to claim 2, characterized in that: The first node is connected to a first protection diode and a first lightning arrester; the second node is connected to a second protection diode and a second lightning arrester; the cathode of the first protection diode is connected to the first node, the anode of the first thyristor and the first end of the first lightning arrester, and the anode is connected to the cathode of the first thyristor and the second end of the first lightning arrester; the first end of the first lightning arrester is connected to the anode of the first thyristor and the first node; the second end of the first lightning arrester is connected to the second output end of the opening operation control loop through a first energy storage capacitor freewheeling resistor; the cathode of the second protection diode is connected to the second node, the anode of the second thyristor and the first end of the second lightning arrester, and the anode is connected to the cathode of the second thyristor and the second end of the second lightning arrester; the first end of the second lightning arrester is connected to the anode of the second thyristor and the second node; the second end of the second lightning arrester is connected to the second output end of the closing operation control loop through a second energy storage capacitor freewheeling resistor.

5. A DC switch opening and closing control circuit according to claim 2, characterized in that: The open energy storage capacitor discharge circuit includes: a first two-position selection switch, a first manual switch, a first normally open relay, a first discharge resistor and a first vacuum relay; the closed energy storage capacitor discharge circuit includes: a second two-position selection switch, a second manual switch, a second normally open relay, a second discharge resistor and a second vacuum relay; the first normally open relay and the second normally open relay both have a switch end and a control end; the first vacuum relay and the second vacuum relay both have a switch end and a control end; one end of the first discharge resistor is connected to the first node, and the other end is connected to the switch of the first vacuum relay, the other end of the switch of the first vacuum relay is grounded, one end of the control end of the first vacuum relay is connected to the sixth port, and the other end is respectively connected to one end of the switch end of the first manual switch and the first normally open relay; the other end of the switch end of the first normally open relay is connected There is a fifth port; the other end of the first manual switch is connected to the fourth port, and the fifth port and the fourth port are set at the switch selection position of the first two-position selection switch; the other end of the first two-position selection switch is connected to the third port; one end of the second discharge resistor is connected to the second node, and the other end is connected to the switch of the second vacuum relay, the other end of the switch of the second vacuum relay is grounded, one end of the control end of the second vacuum relay is connected to the twelfth port, and the other end is respectively connected to one end of the switch end of the second manual switch and the second normally open relay; the other end of the switch end of the second normally open relay is connected to the eleventh port; the other end of the second manual switch is connected to the tenth port, and the eleventh port and the tenth port are set at the switch selection position of the second two-position selection switch; the other end of the second two-position selection switch is connected to the ninth port.

6. A DC switch opening and closing control circuit according to claim 1, characterized in that: The high-frequency transformer in the opening operation control loop is a first high-frequency transformer; the high-frequency transformer in the closing operation control loop is a second high-frequency transformer; the first high-frequency transformer has a first primary coil, a first secondary coil, and a first primary auxiliary coil; the second high-frequency transformer has a second primary coil, a second secondary coil, and a second primary auxiliary coil; the first primary auxiliary coil of the first high-frequency transformer has one end grounded and the other end connected to the anode of a tenth diode, the cathode of the tenth diode is connected to port 1 of a first switching power supply, the first switching power supply further has a port 2 and a ground port, which are grounded via the ground port, the port 2 of the first switching power supply is grounded via a fifth filter capacitor, and the port 2 of the first switching power supply is connected to a first voltage output terminal; the second primary auxiliary coil of the second high-frequency transformer has one end grounded and the other end connected to the anode of a twentieth diode, the cathode of the twentieth diode is connected to port 1 of a second switching power supply, the second switching power supply further has a port 2 and a ground port, which are grounded via the ground port, the port 2 of the second switching power supply is grounded via a sixth filter capacitor, and the port 2 of the second switching power supply is connected to a second voltage output terminal.

7. A DC switch opening and closing control circuit according to claim 6, characterized in that: The quadruple voltage rectifier and filter circuit module of the opening operation control loop is a first quadruple voltage rectifier and filter circuit module; the quadruple voltage rectifier and filter circuit module of the closing operation control loop is a second quadruple voltage rectifier and filter circuit module; The first quadruple voltage rectifier and filter circuit module includes: a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a second electrolytic capacitor, a fifth diode, a sixth diode, a seventh diode and an eighth diode; one end of the first secondary coil of the first high-frequency transformer is connected to the first end of the second capacitor of the first quadruple voltage rectifier and filter circuit module and the first end of the third capacitor, the other end of the first secondary coil of the first high-frequency transformer is connected to the positive electrode of the fifth diode, the negative electrode of the sixth diode, the second end of the fourth capacitor and the first end of the fifth capacitor; the second end of the second capacitor is connected to the negative electrode of the fifth diode and the positive electrode of the seventh diode; the second end of the third capacitor is connected to the positive electrode of the sixth diode and the negative electrode of the eighth diode; the positive electrode of the fifth diode is connected to the negative electrode of the sixth diode; the negative electrode of the seventh diode is connected to the first end of the fourth capacitor and the first end of the second electrolytic capacitor, the positive electrode of the eighth diode is connected to the second end of the fifth capacitor and the second end of the second electrolytic capacitor, and the first end of the fifth capacitor is connected to the second end of the fourth capacitor; the second quadruple voltage rectifier and filter circuit module The circuit module includes: a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourth electrolytic capacitor, a fifteenth diode, a sixteenth diode, a seventeenth diode and an eighteenth diode; one end of the second secondary coil of the second high-frequency transformer is connected to the first end of the tenth capacitor of the second four-fold voltage rectifier and filter circuit module and the first end of the eleventh capacitor, and the other end of the second secondary coil of the second high-frequency transformer is connected to the anode of the fifteenth diode, the cathode of the sixteenth diode, the second end of the twelfth capacitor and the first end of the thirteenth capacitor; the second end of the tenth capacitor is connected to the cathode of the fifteenth diode and the anode of the seventeenth diode; the second end of the eleventh capacitor is connected to the anode of the sixteenth diode and the cathode of the eighteenth diode; the anode of the fifteenth diode is connected to the cathode of the sixteenth diode; the cathode of the seventeenth diode is connected to the first end of the twelfth capacitor and the first end of the fourth electrolytic capacitor, the anode of the eighteenth diode is connected to the second end of the thirteenth capacitor and the second end of the fourth electrolytic capacitor, and the first end of the thirteenth capacitor is connected to the second end of the twelfth capacitor.

8. A controller, characterized in that: A control circuit for controlling the opening and closing of a DC switch according to any one of claims 1 to 7, comprising: CPU control algorithm module, used for parameter setting, sampling control and calculation; PWM output and power drive circuit module, used to provide PWM control waveform and drive circuit to the power conversion circuit module; A voltage and current sampling circuit module, used for voltage division and current shunting processing of the output of the quadruple voltage rectifier and filter circuit module; a thyristor trigger circuit module, configured to receive a trigger command from the CPU control algorithm module and perform trigger control on the thyristors in the opening operation control loop and the closing operation control loop; Protection circuit module, used to realize overcurrent, overvoltage and short circuit protection functions; A signal conditioning circuit module, used to filter and perform operational amplifier processing on the voltage and current output by the voltage and current sampling circuit module and the protection circuit module, and then convert them into voltage signals required by the analog-to-digital conversion chip; An A / D conversion circuit module, configured to perform high-frequency sampling on the voltage signal output by the signal conditioning circuit module; An auxiliary power supply circuit module, used to supply power to the signal conditioning circuit module and the thyristor trigger circuit module; The start-stop control circuit module is used to control the start or stop of the opening operation control circuit or the closing operation control circuit when the external environment is normal or faulty.

9. A method for using a controller, based on the controller according to claim 8, characterized in that: The following steps are involved: Setting the output voltage, output current setting value and the upper temperature limit alarm value of the power switch in the power conversion circuit module through the CPU control algorithm module; The voltage and current sampling circuit module is used to divide the voltage output by the quadruple voltage rectifier and filter circuit module in the control circuit for opening and closing the DC switch and perform current shunting processing; Reading the sampled values ​​of the output voltage, output current and the temperature of the power switch in the power conversion circuit module through the CPU control algorithm module; After digital filtering is performed by the signal conditioning circuit module, short circuit abnormality judgment is performed by the CPU control algorithm module.

10. The method for using a controller according to claim 9, characterized in that: The CPU control algorithm module performs short circuit abnormality judgment: If there is a short circuit abnormality, the power switch in the power conversion circuit module is controlled to be disconnected through the PWM output and power drive circuit module, and then the short circuit current is sampled; If there is no short circuit abnormality and the output voltage exceeds the set value, the power switch in the power conversion circuit module is PWM controlled and adjusted by the PWM output and power drive circuit module, and the output voltage sampling value is judged by the CPU control algorithm module; If the output voltage does not exceed the set value and the output current exceeds the set value, the power switch in the power conversion circuit module is PWM controlled and adjusted by the PWM output and power drive circuit module, and the output current sampling value is judged by the CPU control algorithm module; If the output current does not exceed the set value and the temperature of the power switch in the power conversion circuit module exceeds the upper limit alarm value, the power switch in the power conversion circuit module is controlled to be disconnected through the PWM output and power drive circuit module, and then the output voltage, current and temperature of the power switch are sampled; If the temperature of the power switch does not exceed the upper alarm value, PWM control adjustment is performed through the PWM output and power drive circuit module, and then the output voltage, current and temperature of the power switch are sampled.

11. An electromagnetic repulsion mechanism, characterized in that: It comprises an opening repulsion coil, a repulsion disk, a closing repulsion coil and an insulating pull rod, as well as a control circuit for opening and closing a DC switch as described in any one of claims 1 to 7 and a controller as described in claim 8; the opening repulsion coil and the closing repulsion coil are arranged opposite to each other, the repulsion disk is arranged between the opening repulsion coil and the closing repulsion coil, and the insulating pull rod passes through the repulsion disk and is fixedly connected to the repulsion disk; one end of the opening repulsion coil is connected to the negative pole of the first thyristor, and the other end of the opening repulsion coil is connected to the second output end of the opening operation control circuit; one end of the closing repulsion coil is connected to the negative pole of the second thyristor, and the other end of the closing repulsion coil is connected to the second output end of the closing operation control circuit.

12. A method for using an electromagnetic repulsion mechanism, based on the electromagnetic repulsion mechanism according to claim 11, characterized in that: The following steps are involved: receiving a DC switch opening or closing operation instruction through the controller; The controller sends an operation instruction to the control circuit of the DC switch opening and closing, triggering the energy storage capacitor of the opening circuit to discharge the opening repulsion coil or the energy storage capacitor of the closing circuit to discharge the closing repulsion coil to form a pulse current, thereby pushing the repulsion disk to move at high speed to complete the opening or closing operation; The DC high voltage output current and voltage are collected by the controller.

Images