A high-voltage optically controlled bidirectional switch group

Abstract

This utility model relates to the field of high-voltage power supply semiconductor switch technology, specifically a high-voltage optically controlled bidirectional switch assembly. A pair of optically controlled switch valve bodies and voltage equalizing resistor circuits are symmetrically arranged on each partition between the upper and lower plates of the switch assembly. Optical fibers are connected to the optically controlled switch valve bodies, and these fibers are connected to a positive optical pulse generator and a negative optical pulse generator. This utility model uses a high-energy laser pulse beam to trigger the switch's activation, resulting in superior high- and low-voltage insulation and isolation, and eliminating electromagnetic interference. By improving the length of the optical fiber and the trigger pulse timing, the activation time of the multi-stage series semiconductor switches is controlled within 1μs, thus meeting the requirements for multi-stage series applications. Furthermore, the switch assembly adopts a bidirectional design, allowing bidirectional withstand of rated voltage. The contactless design of the switch valves ensures noiseless operation during activation, meeting partial discharge test requirements while being safer, more stable, flexible, and efficient.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage power supply semiconductor switch technology, specifically a high-voltage optically controlled bidirectional switch assembly. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Partial discharge (PD) testing is an important indicator for evaluating the insulation degradation of power cables. Because it can detect minute insulation defects before insulation breakdown occurs, it enables preventative on-site testing and has been increasingly used in power cable field inspections in recent years. PD testing of power cables is divided into online and offline methods. Offline PD testing requires applying a high-voltage power supply to the cable under test, and the high-voltage power supply used for PD testing must not introduce interference signals from the PD frequency band during its voltage boosting and withstand voltage processes.

[0004] In existing technologies, traditional mechanical switches used in high-voltage power supplies cannot meet the requirements for partial discharge testing due to their structure. While electromagnetically triggered semiconductor electronic switches are contactless and meet the requirements for partial discharge testing, the characteristics of electromagnetic triggering mean that the trigger signal and the high-voltage semiconductor switch cannot be effectively isolated. This leads to difficulties in isolating the high and low voltage sides in high-voltage applications. Furthermore, due to the limitations of the electromagnetic triggering principle itself, the triggering steepness is small, resulting in poor consistency in the opening of valves in series applications. This can easily cause avalanche breakdown, posing a significant safety hazard. Moreover, they cannot be effectively applied to multi-stage series applications and cannot meet the requirements of high-voltage power supply devices used for partial discharge testing.

[0005] Based on the above reasons, this invention designs a high-voltage optically controlled bidirectional switch group, which uses a high-energy laser pulse beam to trigger the switch to turn on, resulting in better high and low voltage insulation and isolation performance and no electromagnetic interference. By improving the length of the optical fiber and the timing of the trigger pulse, the turn-on time of the multi-stage series semiconductor switches is controlled within 1μs, thus meeting the requirements for multi-stage series use. In addition, the switch group adopts a bidirectional design that can withstand the rated voltage in both directions, and the contactless design of the switching valve makes the turn-on process noiseless. While meeting the requirements of partial discharge testing, it is safer, more stable, more flexible and more efficient. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a high-voltage optically controlled bidirectional switch assembly. It employs a high-energy laser pulse beam to trigger the switch's activation, resulting in superior high- and low-voltage insulation and isolation performance, as well as the absence of electromagnetic interference. By improving the length of the optical fiber and the timing of the trigger pulses, the activation time of the multi-stage series semiconductor switches is controlled within 1μs, thus meeting the requirements for multi-stage series applications. Furthermore, the switch assembly adopts a bidirectional design, allowing it to withstand rated voltage in both directions. The contactless design of the switching valve ensures noiseless operation during activation, meeting partial discharge testing requirements while being safer, more stable, more flexible, and more efficient.

[0007] To achieve the above objectives, this utility model provides a high-voltage optically controlled bidirectional switch assembly, including an upper switch assembly plate and a lower switch assembly plate. Multiple partitions are connected between the upper and lower switch assembly plates via a switch assembly support rod. A pair of optically controlled switch valve bodies are symmetrically arranged on each partition. A set of voltage equalizing resistor circuits is arranged on each partition between the symmetrically arranged optically controlled switch valve bodies. Optical fibers are connected to the optically controlled switch valve bodies, and the optical fibers are connected to a positive optical pulse generator and a negative optical pulse generator.

[0008] Multiple sets of voltage-equalizing resistor circuits on each partition are connected in parallel.

[0009] The voltage equalizing resistor circuit includes a voltage equalizing resistor, the two ends of which are connected in parallel between the light-controlled switch valve body.

[0010] Each layer of the photo-controlled switch valve body on one side of the equalizing resistor circuit is set as a positive switch valve body, and each layer of the photo-controlled switch valve body on the other side of the equalizing resistor circuit is a negative switch valve body.

[0011] The photoelectric converter is installed inside the light-controlled switch valve body. The photoelectric converter is connected to the positive light pulse generator and the negative light pulse generator through the positive light guiding optical fiber and the negative light guiding optical fiber, respectively.

[0012] The positive light pulse generator and the negative light pulse generator receive the positive trigger pulse and the negative trigger pulse, respectively.

[0013] The photoelectric converter in the positive switching valve body is electrically connected to the diode in the positive switching valve body, and the photoelectric converter in the negative switching valve body is electrically connected to the diode in the negative switching valve body.

[0014] The size of the partition is smaller than that of the upper and lower plates of the switch assembly, and the partition is made of polished copper plate.

[0015] The switchgear support rod is made of epoxy rod material with high insulation strength.

[0016] Optical fibers are divided into forward optical fibers and negative optical fibers. The optical fibers are glass fibers that are well adapted to the light-controlled switch valve body, and the length of each optical fiber is consistent.

[0017] Compared with existing technologies, this invention uses high-energy pulsed laser beams for both the positive and negative trigger pulses as the turn-on signal, ensuring complete isolation between high and low voltages and exhibiting excellent insulation performance. The use of equal-length optical fiber and a single electrical pulse to generate the trigger signal ensures the simultaneous turn-on of multiple stages of the optically controlled switch valves within the switch group, meeting the requirements for multi-stage series operation. The voltage-equalizing resistor circuit, formed by parallel voltage-equalizing resistors between the series optically controlled switch valves, can withstand the rated operating voltage bidirectionally before turn-on and can achieve unidirectional or simultaneous bidirectional turn-on depending on the application scenario. The main body of the switch valve is a contactless switch, implemented through a photoelectric converter, resulting in noiseless turn-on and meeting the overall requirements for partial discharge detection in high-voltage testing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a high-pressure optically controlled bidirectional switch assembly consisting of five pairs of switching valves according to this utility model.

[0019] Figure 2 This is a schematic diagram of the principle of the high-pressure optically controlled bidirectional switch group composed of five pairs of switching valves of this utility model.

[0020] Explanation of reference numerals in the attached diagram: 1: Upper plate of switch assembly; 2: Support rod of switch assembly; 3: Light-controlled switch valve body; 4: Partition plate; 5: Optical fiber; 6: Voltage equalizing resistor; 7: Lower plate of switch assembly; 8: Positive trigger pulse; 9: Negative trigger pulse; 10: Positive optical pulse generator; 11: Negative optical pulse generator; 12: Positive optical fiber; 13: Negative optical fiber; 14: Positive switch valve body; 15: Negative switch valve body; 16: Photoelectric converter. Detailed Implementation

[0021] The present invention will now be further described with reference to the accompanying drawings.

[0022] See Figures 1-2 This utility model provides a high-voltage optically controlled bidirectional switch assembly, including an upper switch assembly plate 1 and a lower switch assembly plate 7. Five partition plates 4 are connected between the upper switch assembly plate 1 and the lower switch assembly plate 7 via a switch assembly support rod 2. In this embodiment, the lowest partition plate 4 can be directly set on the lower switch assembly plate 7. A pair of optically controlled switch valve bodies 3 are symmetrically arranged on each partition plate 4. A set of voltage equalization resistor circuits is arranged on each partition plate 4 and between the symmetrically located optically controlled switch valve bodies 3. An optical fiber 5 is connected to the optically controlled switch valve body 3. The optical fiber 5 is connected to a positive light pulse generator 10 and a negative light pulse generator 11.

[0023] Multiple sets of equalizing resistor circuits on each partition 4 are connected in parallel.

[0024] The voltage equalizing resistor circuit includes a voltage equalizing resistor 6, the two ends of which are connected in parallel between the light-controlled switch valve body 3.

[0025] Each layer of photo-controlled switch valve body 3 on one side of the equalizing resistor circuit is set as a positive switch valve body 14, and each layer of photo-controlled switch valve body 3 on the other side of the equalizing resistor circuit is a negative switch valve body 15.

[0026] The photoelectric converter 16 is installed inside the light-controlled switch valve body 3. The photoelectric converter 16 is connected to the positive light pulse generator 10 and the negative light pulse generator 11 through the forward light guiding optical fiber 12 and the negative light guiding optical fiber 13, respectively.

[0027] The positive light pulse generator 10 and the negative light pulse generator 11 receive the positive trigger pulse 8 and the negative trigger pulse 9, respectively.

[0028] The photoelectric converter 16 in the positive switching valve body 14 is electrically connected to the diode in the positive switching valve body 14, and the photoelectric converter 16 in the negative switching valve body 15 is electrically connected to the diode in the negative switching valve body 15.

[0029] The size of the partition 4 is smaller than that of the upper plate 1 and the lower plate 7 of the switch assembly. The partition 4 is a polished copper plate.

[0030] The switch assembly support rod 2 is an epoxy rod with high insulation strength.

[0031] The optical fiber 5 is divided into a forward optical fiber 12 and a negative optical fiber 13. The optical fiber 5 is a glass optical fiber that is well adapted to the light-controlled switch valve body 3, and the length of each optical fiber 5 is consistent.

[0032] The working principle of this utility model is as follows:

[0033] like Figure 1 As shown, the structure of this utility model is simple and reasonable. Multiple copper partitions 4 with strong conductivity are set between the upper plate 1 and the lower plate 7 of the switch group. The partitions 4 are supported by the switch group support rods 2 with good insulation installed around the perimeter. Together with the high strength of the upper plate 1 and the lower plate 7 of the switch group, they form a structural integrity and maintain stability.

[0034] Each layer of partition 4 is symmetrically equipped with a positive switch valve body 14 and a negative switch valve body 15, both of which integrate photoelectric conversion circuits and contactless unidirectional semiconductor switches. The unidirectional semiconductor switch can withstand bidirectional rated operating voltage before being triggered. The internal photoelectric conversion circuit can convert the high-energy pulsed laser beam into an electronic switching trigger signal to trigger the unidirectional semiconductor switch.

[0035] like Figure 2 As shown, the switch group can withstand the rated bidirectional voltage before it is turned on.

[0036] When unidirectional conduction occurs, taking forward conduction as an example, the forward trigger pulse 8 used for triggering is converted into a high-energy pulse laser beam by the forward pulse generator 10. The high-energy pulse laser beam enters the forward switch valve body 14 through the forward optical fiber 12. The forward optical fiber 12 adopts an equal-length design. Since the forward trigger pulse 8 is a single pulse trigger signal, the high-energy pulse laser beam can reach each optically controlled switch valve body 3 in the switch group at the same time.

[0037] Since the photoelectric converter 16 is built into the forward switching valve body 14 and is electrically connected to the diode in the forward switching valve body 14, the photoelectric converter 16 built into the light-controlled switching valve body 3 converts the high-energy pulsed laser beam into a semiconductor switch trigger signal, realizes the opening of the semiconductor switch, and thus realizes the forward conduction of the switch group.

[0038] During bidirectional conduction, to ensure the time synchronization of bidirectional conduction, the positive trigger pulse 8 and the negative trigger pulse 9 use the same trigger pulse signal. The trigger pulse is converted into a high-energy pulsed laser beam by the positive optical pulse generator 10 and the negative optical pulse generator 11. The high-energy pulsed laser beam enters the positive switch valve body 14 and the negative switch valve body 15 through the positive optical fiber 12 and the negative optical fiber 13. The positive optical fiber 12 and the negative optical fiber 13 are designed with equal length. Since the positive trigger pulse 8 and the negative trigger pulse 9 are single pulse trigger signals, the high-energy pulsed laser beam can reach each optically controlled switch valve body 3 in the switch group at the same time.

[0039] Since the photoelectric converter 16 in the positive switch valve body 14 is built into the positive switch valve body 14, and the photoelectric converter 16 in the negative switch valve body 15 is built into the negative switch valve body 15, the photoelectric converter built into the light-controlled switch valve body 3 converts the high-energy pulsed laser beam into a semiconductor switch trigger signal, realizes the opening of the semiconductor switch, and thus realizes the bidirectional conduction of the switch group.

[0040] The above are merely preferred embodiments of this utility model, intended only to aid in understanding the method and core concept of this application. The scope of protection of this utility model is not limited to the above embodiments; all technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the scope of protection of this utility model.

[0041] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] This invention comprehensively solves the shortcomings of existing technologies in high-voltage power supply partial discharge testing, such as the difficulty in isolating the trigger signal and the high-voltage semiconductor switch, leading to isolation difficulties between high and low voltage tests, and the safety hazards caused by poor consistency in the opening of series-connected switching valves. These shortcomings prevent the use of high-voltage power supply devices for partial discharge testing. The invention converts a high-energy pulsed laser beam into a semiconductor switch trigger signal, which is then converted by a photoelectric converter to achieve the opening of the semiconductor switch. Utilizing the single pulse trigger signal of the high-energy pulsed laser beam ensures complete isolation between high and low voltages and guarantees the simultaneous opening of multiple photo-controlled switching valves within the switch group, meeting the requirements for multi-stage series use. It can withstand the rated operating voltage and can achieve unidirectional or bidirectional simultaneous opening depending on the application scenario, achieving flexibility in opening tests. Furthermore, it produces no noise pollution during opening, achieving multiple benefits including safety, efficiency, flexibility, and environmental friendliness. With a simple and reasonable structure, convenient installation and maintenance, it possesses good market application value.

Claims

1. A high-voltage optically controlled bidirectional switch assembly, comprising an upper switch assembly plate (1) and a lower switch assembly plate (7), characterized in that, The upper plate (1) of the switch group and the lower plate (7) of the switch group are connected by a switch group support rod (2) with multiple partitions (4). Each partition (4) is symmetrically provided with a pair of light-controlled switch valve bodies (3). Each partition (4) and the symmetrical light-controlled switch valve bodies (3) are provided with a set of equalizing resistor circuits. The light-controlled switch valve bodies (3) are connected with light-guiding optical fibers (5). The light-guiding optical fibers (5) are connected to the positive light pulse generator (10) and the negative light pulse generator (11).

2. The high-voltage optically controlled bidirectional switch assembly according to claim 1, characterized in that, Multiple sets of equalizing resistor circuits on each of the partitions (4) are connected in parallel.

3. The high-voltage optically controlled bidirectional switch assembly according to claim 2, characterized in that, The voltage equalization resistor circuit includes a voltage equalization resistor (6), the two ends of which are connected in parallel between the light-controlled switch valve body (3).

4. The high-voltage optically controlled bidirectional switch assembly according to claim 3, characterized in that, The light-controlled switch valve body (3) on one side of the equalizing resistor circuit is set as a positive switch valve body (14), and the light-controlled switch valve body (3) on the other side of the equalizing resistor circuit is set as a negative switch valve body (15).

5. The high-voltage optically controlled bidirectional switch assembly according to claim 4, characterized in that, The photoelectric converter (16) is provided inside the light-controlled switch valve body (3). The photoelectric converter (16) is connected to the positive light pulse generator (10) and the negative light pulse generator (11) through the forward light guiding fiber (12) and the negative light guiding fiber (13), respectively.

6. The high-voltage optically controlled bidirectional switch assembly according to claim 5, characterized in that, The positive light pulse generator (10) and the negative light pulse generator (11) respectively receive the positive trigger pulse (8) and the negative trigger pulse (9).

7. The high-voltage optically controlled bidirectional switch assembly according to claim 4, characterized in that, The photoelectric converter (16) in the positive switching valve body (14) is electrically connected to the diode in the positive switching valve body (14), and the photoelectric converter (16) in the negative switching valve body (15) is electrically connected to the diode in the negative switching valve body (15).

8. The high-voltage optically controlled bidirectional switch assembly according to claim 1, characterized in that, The size of the partition (4) is smaller than the size of the upper plate (1) and lower plate (7) of the switch group, and the partition (4) is a polished copper plate.

9. The high-voltage optically controlled bidirectional switch assembly according to claim 1, characterized in that, The switch group support rod (2) is an epoxy rod with high insulation strength.

10. The high-voltage optically controlled bidirectional switch assembly according to claim 1, characterized in that, The optical fiber (5) is divided into a forward optical fiber (12) and a negative optical fiber (13). The optical fiber (5) is a glass optical fiber that is well adapted to the light-controlled switch valve body (3). The length of each optical fiber (5) is consistent.

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