Electronic switch capable of preventing high-voltage breakdown

Abstract

The utility model relates to the technical field of electronic power switches, in particular to an electronic switch capable of preventing high-voltage breakdown. Comprising a mainboard, a control unit, a low-voltage switch, a high-voltage switch, an electrical isolation piece, a surge absorption unit and the like, the mainboard is fixedly connected in a shell, the control unit, the low-voltage switch, the high-voltage switch, the electrical isolation piece and the surge absorption unit are arranged at different positions on the mainboard respectively, and the low-voltage switch is connected with the high-voltage switch in series. The low-voltage switch and the high-voltage switch are both electrically connected with the control unit, an electrical isolation piece is connected between the low-voltage switch and the high-voltage switch, the surge absorption unit comprises a piezoresistor and a gas discharge tube, and the surge absorption unit is connected between the input end and the grounding end of the mainboard in parallel. Safety isolation between high voltage and low voltage is achieved through the electrical isolation piece, surge energy is absorbed through the surge absorption unit to protect the circuit, the high-voltage breakdown phenomenon can be effectively prevented, and stable operation of an electric power system and personnel safety are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronic switches, in particular to an electronic switch capable of preventing high-voltage breakdown. Background Art

[0002] In power systems and industrial automation, electronic switches, as key power control components, are widely used in scenarios with various voltage levels and current scales. Electronic switches are operating units that use electronic circuits and electronic devices to turn circuits on and off. They include at least one controllable electronic driver, such as thyristors, transistors, field-effect transistors, thyristors, and relays.

[0003] Existing electronic switches do not have high-voltage protection circuits, so they are prone to high-voltage breakdown in high-voltage application scenarios, which will not only damage the components inside the switch, but may also cause safety accidents such as fire and explosion, posing a serious threat to personnel and equipment. Utility Model Content

[0004] In order to overcome the shortcomings of existing electronic switches that, due to the lack of high-voltage protection circuits, high-voltage breakdown is prone to occur in high-voltage application scenarios, which has an adverse effect on personnel and equipment, the utility model provides an electronic switch that is resistant to high-voltage breakdown.

[0005] The technical scheme is as follows: an electronic switch for preventing high-voltage breakdown, comprising a housing, a cover plate, a main board, a control unit, a low-voltage switch, a high-voltage switch, an electrical isolator and a surge absorption unit, wherein the housing is detachably connected with the cover plate, the housing is fixedly connected with the main board, and the main board is provided with the control unit, the low-voltage switch, the high-voltage switch, the electrical isolator and the surge absorption unit at different positions;

[0006] The low-voltage switch and the high-voltage switch are connected in series, both the low-voltage switch and the high-voltage switch are electrically connected to the control unit, and an electrical isolator is connected between the low-voltage switch and the high-voltage switch;

[0007] The surge absorption unit includes a varistor and a gas discharge tube, and the surge absorption unit is connected in parallel between the input terminal and the ground terminal of the mainboard.

[0008] As an improvement of the above solution, the low voltage switch adopts an insulated gate bipolar transistor (IGBT).

[0009] As an improvement to the above solution, a solid-state relay (SSR) is used as the high-voltage switch.

[0010] As an improvement of the above solution, the electrical isolation element adopts a photoelectric coupler.

[0011] As an improvement of the above solution, the shell and the cover plate are both made of high-performance insulating materials such as polyimide or polytetrafluoroethylene.

[0012] As an improvement of the above solution, the interior of the housing is filled with sulfur hexafluoride gas or insulating oil.

[0013] Beneficial effects: The utility model uses a control unit to accurately control the on and off states of the low-voltage switch and the high-voltage switch, uses electrical isolation components to achieve safe isolation between high and low voltages, and absorbs surge energy through a surge absorption unit to protect the circuit, which can effectively prevent the occurrence of high-voltage breakdown and ensure the stable operation of the power system and the safety of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0015] Figure 2 It is an exploded view of the three-dimensional structure of the shell and cover of the utility model.

[0016] Figure 3 It is a three-dimensional structural schematic diagram of the mainboard of the utility model.

[0017] The reference numbers in the figure are: 1. outer casing, 101. cover plate, 2. main board, 3. control unit, 4. low-voltage switch, 5. high-voltage switch, 6. electrical isolator, 7. varistor, 8. gas discharge tube. DETAILED DESCRIPTION

[0018] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0019] Embodiment: An electronic switch for preventing high voltage breakdown, such as Figure 1-Figure 3 As shown, it includes a shell 1, a cover plate 101, a main board 2, a control unit 3, a low-voltage switch 4, a high-voltage switch 5, an electrical isolator 6 and a surge absorption unit. The shell 1 and the cover plate 101 are detachably connected to facilitate users to install, repair and replace components. The main board 2 is fixedly connected to the shell 1, and the control unit 3, the low-voltage switch 4, the high-voltage switch 5, the electrical isolator 6 and the surge absorption unit are respectively arranged at different positions on the main board 2.

[0020] The low voltage switch 4 uses an insulated gate bipolar transistor (IGBT), and the high voltage switch 5 uses a solid state relay (SSR), which are connected in series to form a main path of the circuit.

[0021] Among them, the control unit 3 is electrically connected to the low-voltage switch 4 and the high-voltage switch 5. The control unit 3 is the core of the entire switch system, responsible for receiving external signals and controlling the on and off states of the low-voltage switch 4 and the high-voltage switch 5 according to preset parameters or instructions.

[0022] Among them, the electrical isolator 6 is located between the low-voltage switch 4 and the high-voltage switch 5 to achieve electrical isolation between high and low voltages. The electrical isolator 6 adopts a photoelectric coupler, which transmits control signals through optical signals to ensure that the control signals on the low-voltage side will not directly affect the high-voltage side, thereby improving the safety and reliability of the system.

[0023] The surge absorption unit includes a varistor 7 and a gas discharge tube 8. The surge absorption unit is connected in parallel between the input terminal and the ground terminal of the mainboard 2. The surge absorption unit can quickly respond and absorb surge energy to ensure that the circuit can still maintain stable operation under surge impact.

[0024] The housing 1 and the cover plate 101 are both made of high-performance insulating materials such as polyimide or polytetrafluoroethylene to ensure the overall insulating performance of the electronic switch.

[0025] The housing 1 is filled with sulfur hexafluoride gas or insulating oil, which further improves the insulation capacity and withstand voltage performance of the electronic switch.

[0026] Working principle: When the control unit 3 receives the start command, it will first turn on the low-voltage switch 4, and then the high-voltage switch 5 will also be turned on, thereby forming a complete current path; when the circuit needs to be cut off, the control unit 3 will first disconnect the high-voltage switch 5, and then disconnect the low-voltage switch 4 to ensure that the circuit is safely disconnected; when a surge (overvoltage) occurs at the input end of the motherboard, the varistor 7 and the gas discharge tube 8 will quickly turn on, directing the surge energy to the ground terminal of the motherboard, thereby protecting the motherboard circuit from overvoltage damage.

[0027] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An electronic switch for preventing high-voltage breakdown, comprising a housing (1), a cover plate (101) and a main board (2), wherein the housing (1) is detachably connected to the cover plate (101), and the main board (2) is fixedly connected to the housing (1), characterized in that: It also includes a control unit (3), a low-voltage switch (4), a high-voltage switch (5), an electrical isolator (6) and a surge absorption unit. The control unit (3), the low-voltage switch (4), the high-voltage switch (5), the electrical isolator (6) and the surge absorption unit are respectively arranged at different positions on the main board (2); The low-voltage switch (4) and the high-voltage switch (5) are connected in series, the low-voltage switch (4) and the high-voltage switch (5) are both electrically connected to the control unit (3), and an electrical isolator (6) is connected between the low-voltage switch (4) and the high-voltage switch (5); The surge absorption unit comprises a varistor (7) and a gas discharge tube (8), and the surge absorption unit is connected in parallel between the input end and the ground end of the mainboard (2).

2. The electronic switch for preventing high voltage breakdown according to claim 1, characterized in that: The low voltage switch (4) adopts an insulated gate bipolar transistor (IGBT).

3. The electronic switch for preventing high voltage breakdown according to claim 2, characterized in that: The high voltage switch (5) adopts a solid state relay (SSR).

4. The electronic switch for preventing high voltage breakdown according to claim 3, characterized in that: The electrical isolator (6) adopts a photoelectric coupler.

5. The electronic switch for preventing high voltage breakdown according to claim 4, characterized in that: The housing (1) and the cover plate (101) are both made of high-performance insulating materials such as polyimide or polytetrafluoroethylene.

6. The electronic switch for preventing high voltage breakdown according to claim 5, characterized in that: The interior of the housing (1) is filled with sulfur hexafluoride gas or insulating oil.

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