Gas switch test circuit and system

Abstract

The application discloses a kind of gas switch test circuit and system, wherein test circuit includes: power supply, negative transmission row and load, the positive pole of the gas switch is connected with the power supply, the negative pole of multiple gas switches is electrically connected with the load by the negative transmission row, wherein, the gas switch is symmetrically distributed relative to load on the negative transmission row.When a certain gas switch is turned on, the electromagnetic wave generated by its trigger process will propagate in the negative transmission row and space, which may have an impact on the early breakdown or delayed breakdown of the adjacent gas switch that has not yet been turned on. By centering the load symmetrically, connecting the negative pole of the gas switch to the same negative transmission row, forming a parallel gas switch, a symmetric circuit topology with unified negative pole and shared load, each gas switch works under the same electrical conditions, minimizing the trigger time difference caused by loop differences, and achieving high consistency and synchronous triggering.

Description

Technical Field

[0001] This application relates to the field of high-voltage electrical equipment testing technology, specifically to a gas switch testing circuit and system. Background Technology

[0002] In high-power pulsed discharge equipment, gas switches are widely used in pulsed power, strong electromagnetic fields, inertial confinement fusion and high-power microwave devices due to their characteristics such as high voltage resistance, strong breaking capacity and relatively low cost.

[0003] In the operation of such equipment, dozens or even hundreds of gas switches typically need to be triggered simultaneously to ensure stable pulse power output. However, due to the dispersion of the breakdown voltage of the gas switches and the influence of gas pressure, triggering structure, and circuit layout on their operating state, the conduction time of different gas switches varies, thus affecting the synchronization and energy transfer efficiency of the entire system. Existing methods mainly ensure the consistency of gas switches by precisely controlling the gas pressure of each gas switch, optimizing the triggering circuit, and adjusting the structural parameters of the gas switches. However, in practical engineering, the large number of gas switches and the complexity of environmental factors still make it difficult to achieve highly consistent synchronous triggering, thereby affecting the overall system performance.

[0004] Therefore, improving the consistency of gas switch conduction testing has become an urgent technical problem to be solved. Utility Model Content

[0005] In view of this, this application provides a gas switch test circuit and system to solve the technical problem of how to improve the continuity consistency of gas switch testing.

[0006] This application provides a gas switch test circuit for performing consistency testing on multiple gas switches. The test circuit includes a power supply, a negative transmission bus, and a load. The positive terminals of the gas switches are connected to the power supply, and the negative terminals of the multiple gas switches are electrically connected to the load through the negative transmission bus. The gas switches are symmetrically distributed on the negative transmission bus relative to the load.

[0007] In one embodiment, adjacent gas switches are distributed at equal intervals on the negative electrode transmission busbar.

[0008] In one embodiment, the electrical path length from the negative terminal of each gas switch to the load via the negative terminal transmission bus is equal.

[0009] In one embodiment, the gas switches are arranged in a ring on the negative electrode transmission busbar, and the load is located at the center of the ring.

[0010] In one embodiment, the gas switches are symmetrically distributed on both sides of the negative electrode transmission busbar with the load as the center point.

[0011] In one embodiment, the negative electrode transmission busbar is provided with an electromagnetic shielding device or an electromagnetic absorption device.

[0012] In one embodiment, a gas switch breakdown signal acquisition device is installed at the negative terminal of each gas switch.

[0013] In one embodiment, the gas switch test circuit further includes a trigger circuit connected to the trigger electrode of the gas switch, wherein the electrical paths from the trigger circuit to the trigger electrode of each gas switch are of equal length.

[0014] According to the second aspect, this application also provides a gas switch testing system, a gas supply circuit and the gas switch testing circuit described in any one of the first aspects above, wherein the gas supply circuit is connected to the gas switch and is used to charge the gas switch.

[0015] In one embodiment, the gas supply circuit includes: a gas source, an inflation valve, an exhaust valve, and a pressure sensor. The gas source is connected to the inflation port of the gas switch through the inflation valve, the exhaust valve is connected to the exhaust port of the gas switch, and the pressure sensor is connected between the gas source and the inflation port.

[0016] This application has at least the following technical effects:

[0017] The gas switch test circuit in this application is used to perform consistency testing on multiple gas switches. The test circuit includes a power supply, a negative transmission bus, and a load. The positive terminals of the gas switches are connected to the power supply, and the negative terminals of the multiple gas switches are electrically connected to the load through the negative transmission bus. The gas switches are symmetrically distributed on the negative transmission bus relative to the load. When a gas switch is turned on, the electromagnetic waves generated during its triggering process propagate within the negative transmission bus and in space, potentially causing premature or delayed breakdown of adjacent gas switches that are not yet turned on. By connecting the negative terminals of the gas switches to the same negative transmission bus with the load as the center of symmetry, a symmetrical circuit topology is formed where the gas switches are connected in parallel, have a unified negative terminal, and share the load. This ensures that each gas switch operates under the same electrical conditions, minimizing triggering time differences caused by circuit variations and achieving highly consistent synchronous triggering. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic structural diagram of a gas switch test circuit according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of another illustrative gas switch test circuit according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of an illustrative gas switch testing system according to an embodiment of this application.

[0022] Figure reference numerals: 100, Gas switch test circuit; 10, Automatic power supply booster high voltage power supply; 20, Negative transmission line; 30, Load; 40, Gas switch; 41, Positive terminal; 42, Negative terminal; 200, Gas supply line; 201, Gas source; 202, Inflation valve; 203, Exhaust valve; 204, Pressure sensor. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] To enable simultaneous triggering of multiple gas switches in application, a self-breakdown test was performed on each gas switch. Each gas switch was connected to a separate test circuit and gas supply line. Under a fixed gas pressure, the applied voltage was gradually increased, and the self-breakdown voltage of the gas switch was recorded. The test was repeated multiple times for each gas switch to obtain the correlation between its gas pressure and average breakdown voltage. Using the same method, the remaining gas switches were tested. Using the first tested gas switch as a reference, the electrode spacing was adjusted so that the breakdown voltage difference between the gas switches under the same gas pressure was within 5%.

[0025] When multiple gas switches that have undergone self-breakdown testing are simultaneously installed in a prior art test circuit, even when the gas pressure is adjusted to the same pressure as the self-breakdown test, the breakdown voltage difference between the different gas switches still exceeds 5%, indicating a significant inconsistency in the breakdown voltage and breakdown time among the gas switches. The applicant's research found that when multiple gas switches are tested simultaneously, the electromagnetic waves generated during the triggering process of one gas switch propagate along the test circuit and in space, potentially causing premature or delayed breakdown of adjacent gas switches that are not yet turned on. The electromagnetic waves emitted during gas switch breakdown introduce additional external influences to the breakdown of the gas switches. The triggering time difference caused by these inconsistencies leads to instability in the conduction of each gas switch, making it difficult to accurately test the consistency of the gas switches.

[0026] Based on this, embodiments of this application provide a gas switch 40 switching test circuit, such as... Figure 1 and Figure 2 As shown, the gas switch 40 test circuit is used to perform consistency testing on multiple gas switches 40. The test circuit includes a power supply 10, a negative transmission bus 20, and a load 30. The positive terminal 41 of each gas switch 40 is connected to the power supply 10, and the negative terminals 42 of the multiple gas switches 40 are electrically connected to the load 30 through the negative transmission bus 20. The gas switches 40 are symmetrically distributed on the negative transmission bus 20 relative to the load 30. When a gas switch 40 is turned on, the electromagnetic waves generated during its triggering process will propagate within the negative transmission bus 20 and in space, potentially causing premature or delayed breakdown of adjacent gas switches 40 that are not yet turned on. By connecting the negative terminals 42 of the gas switches 40 to the same negative terminal transmission bus 20 with the load 30 as the center of symmetry, a symmetrical circuit topology is formed in which the gas switches 40 are connected in parallel, the negative terminals 42 are unified, and the load 30 is shared. This allows each gas switch 40 to work under the same electrical conditions, minimizing the triggering time difference caused by circuit differences and achieving highly consistent synchronous triggering.

[0027] In one embodiment, the adjacent gas switches 40 are evenly spaced on the negative electrode transmission bar 20. All gas switches 40 are uniformly arranged on the negative electrode transmission bar 20, with consistent spacing between adjacent gas switches 40. When one gas switch 40 is turned on, the resulting electromagnetic waves diffuse outwards in space. The evenly spaced distribution of the gas switches 40 ensures that the intensity and duration of electromagnetic interference from adjacent gas switches 40 experienced by each gas switch 40 are completely consistent, avoiding conduction time differences caused by spacing variations.

[0028] In one embodiment, several gas switches 40 that have passed the self-breakdown test are selected. The negative terminals 42 of all gas switches 40 are connected to a negative transmission bus 20, and the negative transmission bus 20 is uniformly connected to the same load 30. The electrical path length from the negative terminal 42 of each gas switch 40 to the load 30 via the negative transmission bus 20 is equal. This ensures that all gas switches 40 operate under the same electrical conditions. The positive terminals 41 of each gas switch 40 are connected to the output terminal of the power supply 10, forming a circuit topology of multiple gas switches 40 connected in parallel with a unified negative terminal 42 and load 30. By using an equal-length electrical path layout, the current and electromagnetic waves generated when the gas switch 40 is turned on will propagate from the negative terminal 42 of the gas switch 40 to the load 30. The equal-length electrical path ensures that all gas switches 40 are simultaneously subjected to current disturbances and electromagnetic wave disturbances from the negative terminal 42. That is, all non-conducting gas switches 40 are subjected to the same intensity of interference at the same time, avoiding conduction instability caused by interference timing differences. This eliminates the triggering time difference introduced by electrical path differences and achieves highly consistent synchronous triggering.

[0029] In one embodiment, the gas switches 40 can be arranged in a ring on the negative terminal transmission bus 20, with the load 30 located at the center of the ring. The electrical path from the negative terminal 42 of all gas switches 40 to the load 30 is the radial distance from the negative terminal 42 of the gas switch 40 to the geometric center of the ring. Therefore, the electrical paths from all gas switches 40 to the load 30 are of equal length. This eliminates the triggering time difference introduced by the difference in electrical paths, achieving highly consistent synchronous triggering.

[0030] In one embodiment, the structure of the negative electrode transmission row 20 can be a ring structure, a disk structure, or other ring-shaped structures, such as a polygonal ring-shaped structure.

[0031] In one embodiment, the gas switches 40 are symmetrically distributed on both sides of the negative electrode transmission bus 20 with the load 30 as the center point. In this embodiment, the negative electrode transmission bus 20 can adopt a double-row symmetrical layout centered on the load 30. The current path lengths of any pair of gas switches 40 at symmetrical positions are equal, ensuring that interference occurs in pairs synchronously. This symmetry can greatly offset the negative impact caused by path differences.

[0032] To further reduce the impact of the spatial electromagnetic waves generated when gas switch 40 is broken down on other gas switches 40, in one embodiment, an electromagnetic shielding device or an electromagnetic absorption device is provided on the negative electrode transmission row 20 to further reduce the cross-influence of spatial electromagnetic waves.

[0033] Specifically, a grounded metal shielding layer is installed outside the negative electrode transmission line 20 as an electromagnetic shielding device to shield spatial electromagnetic waves. Alternatively, sheet-like or strip-like absorbing material is attached to the surface of the negative electrode transmission line 20 or at a specific location near the negative electrode 42 of a gas switch 40 or all gas switches 40 as an electromagnetic absorption device to absorb spatial electromagnetic waves.

[0034] In one embodiment, the gas switch test circuit further includes a trigger circuit connected to the trigger electrode of the gas switch 40. The electrical paths from the trigger circuit to the trigger electrode of each gas switch 40 are of equal length, and the trigger pulses can be applied to the trigger electrodes of all gas switches 40 simultaneously to ensure the consistency of the trigger signals received by all gas switches 40.

[0035] A gas switch 40 breakdown signal acquisition device is installed on the negative terminal 42 of each gas switch 40. A Rogowski coil can be used as an example of the gas switch 40 breakdown signal acquisition device. With the Rogowski coil installed on the negative terminal 42 of the gas switch 40, when a trigger signal is applied by the trigger circuit, the output signal of the Rogowski coil is acquired using a high-speed oscilloscope. The breakdown signal of each gas switch 40 is measured to obtain the synchronization deviation data between the gas switches 40.

[0036] This application also provides a gas switch testing system, comprising a gas supply circuit 200 and the gas switch testing circuit 100 described in any of the above embodiments. The gas supply circuit 200 is connected to the gas switch 40 and is used to inflate the gas switch 40. By connecting the air inlet of all gas switches 40 to the same gas source 201 through the gas supply circuit 200, the pressure of the gas source 201 is kept stable, providing a stable inflation pressure to the gas switches 40. This adjusts the internal pressure of all gas switches 40 to be consistent. Under the condition of consistent internal pressure, the breakdown voltage of each gas switch 40 is tested.

[0037] In one embodiment, the gas supply circuit 200 includes: a gas source 201, an inflation valve 202, an exhaust valve 203, and a pressure sensor 204. The gas source 201 is connected to the inflation port of the gas switch 40 through the inflation valve 202, the exhaust valve 203 is connected to the exhaust port of the gas switch 40, and the pressure sensor 204 is connected between the gas source 201 and the inflation port. Before inflation, the inflation valve 202 and the exhaust valve 203 can be opened to expel the gas inside the gas switch 40 to ensure the purity of the gas inside the gas switch 40 during the breakdown test. After expelling the gas, the exhaust valve 203 is closed, while the inflation valve 202 remains open to inflate the gas switch 40 until the set pressure is reached and the pressure of all gas switches 40 is consistent, thus completing the inflation of the gas switch 40.

[0038] In one embodiment, the gas switch 40 can be tested using the following steps:

[0039] Several gas switches 40 that have passed the self-breakdown test are selected. The negative terminals 42 of all gas switches 40 are connected to the negative transmission bus 20, and the negative transmission bus 20 is connected to the same load 30. When connecting the gas switches 40 to the negative transmission bus 20, at least one of the following arrangements must be met: the gas switches 40 are symmetrically distributed on the negative transmission bus 20 relative to the load 30; adjacent gas switches 40 are evenly spaced; and the electrical path length from the negative terminal 42 of each gas switch 40 to the load 30 via the negative transmission bus 20 is equal. The positive terminals 41 of each gas switch 40 are connected to the output terminal of the power supply 10, forming a symmetrical circuit topology of multiple gas switches 40 connected in parallel, with a unified negative terminal 42 and a shared load 30.

[0040] Next, install the gas supply circuit 200, connect the air inlet of all gas switches 40 to the same gas source 201, ensure the pressure of the gas source 201 is stable, and fill all gas switches 40 with gas at the same pressure.

[0041] A Rogowski coil is installed on the negative terminal 42 of the gas switch 40. The control trigger circuit simultaneously applies trigger pulses to the trigger terminals of all gas switches 40. The output signal of the Rogowski coil is acquired using a high-speed oscilloscope, and the conduction status of each gas switch 40 is measured to obtain the synchronization deviation data between each gas switch 40.

[0042] If necessary, fine-tune the gas pressure of the gas switch 40 and observe its conduction changes to initially improve synchronization. While maintaining consistent gas pressure, check the electrode spacing of each gas switch 40 individually. Through mechanical fine-tuning, reduce or increase the electrode spacing to change the breakdown voltage. Compare the trigger test results and record the correspondence between the electrode spacing changes and the conduction status. Repeat the adjustment until the breakdown voltage and conduction time of each gas switch 40 tend to be consistent, i.e., all within the expected range.

[0043] After completing the adjustment, all gas switches 40 are triggered simultaneously again. Using a high-speed oscilloscope, the breakdown voltage and conduction time of each gas switch 40 are recorded. If any breakdown voltage or conduction time exceeds the expected range, the gas pressure and electrode spacing of the corresponding gas switch 40 are fine-tuned again. This process continues until the breakdown voltage and conduction time of all gas switches 40 are within the expected range, meeting the consistency requirements, at which point the debugging is complete.

[0044] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0045] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A gas switch test circuit, characterized in that, For performing consistency testing on multiple gas switches, the test circuit includes: a power supply, a negative transmission bus, and a load, wherein the positive terminal of each gas switch is connected to the power supply, and the negative terminals of multiple gas switches are electrically connected to the load through the negative transmission bus, wherein the gas switches are symmetrically distributed on the negative transmission bus relative to the load.

2. The gas switch test circuit as described in claim 1, characterized in that, The adjacent gas switches are distributed at equal intervals on the negative electrode transmission line.

3. The gas switch test circuit as described in claim 1, characterized in that, The electrical path length from the negative terminal of each gas switch to the load via the negative terminal transmission bus is equal.

4. The gas switch test circuit as described in any one of claims 1 to 3, characterized in that, The gas switches are arranged in a ring on the negative electrode transmission busbar, and the load is located at the center of the ring.

5. The gas switch test circuit as described in any one of claims 1 to 3, characterized in that, The gas switches are symmetrically distributed on both sides of the negative electrode transmission busbar with the load as the center point.

6. The gas switch test circuit as described in claim 1, characterized in that, The negative electrode transmission bus is equipped with an electromagnetic shielding device or an electromagnetic absorption device.

7. The gas switch test circuit as described in claim 1, characterized in that, A gas switch breakdown signal acquisition device is installed at the negative terminal of each gas switch.

8. The gas switch test circuit as described in claim 1, characterized in that, It also includes a trigger circuit connected to the trigger electrode of the gas switch, wherein the electrical path from the trigger circuit to the trigger electrode of each gas switch is of equal length.

9. A gas switch testing system, comprising a gas supply path and a gas switch testing circuit as described in any one of claims 1 to 8, wherein, The gas supply circuit is connected to the gas switch and is used to charge the gas switch.

10. The gas switch testing system as described in claim 9, characterized in that, The gas supply circuit includes: a gas source, an inflation valve, an exhaust valve, and a pressure sensor. The gas source is connected to the inflation port of the gas switch through the inflation valve. The exhaust valve is connected to the exhaust port of the gas switch. The pressure sensor is connected between the gas source and the inflation port.

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