A circuit and method for prolonging the service life of a two-electrode gas switch

A gas switch and electrode technology, applied in gas switch technology and its application fields, can solve the problems of high cost of gas switch, waste of switch life potential, end of switch life, etc., to improve trigger reliability and increase the probability of reliable breakdown , The effect of reducing the breakdown voltage

Active Publication Date: 2018-07-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, during the use of the traditional two-electrode gas switch, when the electrode is ablated so that the working pressure is adjusted to 1 atmospheric pressure and still cannot be compensated, the life of the switch is considered to be over.
This end of life is limited by the problem of electrode ablation, and the life potential of the rest of the switch is wasted, making the cost of gas switches relatively high

Method used

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  • A circuit and method for prolonging the service life of a two-electrode gas switch
  • A circuit and method for prolonging the service life of a two-electrode gas switch
  • A circuit and method for prolonging the service life of a two-electrode gas switch

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Embodiment 1

[0040] The high-power xenon lamp platform needs to pump energy for the flash lamp through pulse capacitor discharge. The main discharge switch generally uses a two-electrode graphite gas switch, such as the Shenguang 3 energy system. The two-electrode gas switch has a working voltage of 23.5kV and a peak current of 240kA, single shot The amount of charge transferred is 70C, the initial working pressure of the switch is 6.5bar, the leading edge of the trigger pulse is 25ns, and the peak value is 120kV. Its working circuit uses one end of the capacitor to be grounded, the discharge switch is suspended, and the trigger pulse is loaded between the magnetic switch and the main switch. The application circuit diagram is as image 3 Shown. The main discharge switch is subject to strong ablation during discharge. After a certain number of discharges, the air pressure of the main switch is adjusted to reduce the pulse breakdown amplitude of the switch. By adding the device of the presen...

Embodiment 2

[0042] Under the pulsed xenon lamp load condition, in order to ensure the uniform distribution of the current of each xenon lamp, a forced current sharing scheme is adopted, which is realized by dividing each discharge parameter into each xenon lamp circuit, such as the currently commonly used Shenguang-2 energy system, where the main The discharge switch still adopts a two-electrode graphite gas switch, but the main switch adopts the scheme of grounding one end. The specific connection method is as follows Figure 5 As shown, the working voltage of the main switch is 23.5kV, the peak current is 170kA, the amount of charge transferred in a single time is: 35C, the trigger pulse amplitude is 100kV, the leading edge is 15ns, the initial pressure of the switch is 6.5bar, and the switch is reliable by adjusting the pressure after a certain number of transmissions. breakdown. By adding the device of the present invention, the pulse breakdown voltage amplitude of the switch under the ...

Embodiment 3

[0044] In the synthesis circuit, the two-electrode gas switch can be used as a crowbar switch to provide the load with a current pulse that meets the requirements. The working mode of the main circuit can be selected according to the specific situation. Figure 5 or Image 6 There are two methods. The operating voltage range of the main switch: 25~5kV, the peak current can reach 350kA, and the single transfer charge can reach up to 100C / shot, the trigger pulse amplitude is 100kV, the leading edge is 50ns, and the initial switch pressure is 6.5bar. , After a certain number of transfers, the switch can be reliably broken down by adjusting the air pressure. By adding the device of the present invention, the pulse breakdown voltage amplitude of the switch under the condition of 1-2 bar can be reduced by about 20kV. When the switch air pressure is 1 bar (atmospheric pressure), the switch interval will increase by 1.2mm under the trigger pulse. It can work reliably, can effectively e...

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PUM

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Abstract

The invention discloses a circuit used for prolonging the service life of a two-electrode gas switch and a method, so that the switch has the advantages of high reliability and prolonged service life. According to the technical scheme, a circuit comprises the two-electrode gas switch; a coaxial discharge gap which is used for generating ultraviolet and a charged ion diffusion effect is arranged on the two-electrode gas switch; the coaxial discharge gap is connected with an electrode of the two-electrode gas switch; the coaxial discharge gap is connected with a high voltage pulse trigger; the high voltage pulse trigger is grounded; when the two-electrode gas switch is not directly grounded, one electrode is connected with a power load, and the other electrode is connected with an energy storage capacitor; the power load and the energy storage capacitor form a loop and are grounded; when the two-electrode gas switch is directly grounded, one electrode is orderly connected in series with the power load and the energy storage capacitor, and the other electrode and the energy storage capacitor form a loop and are directly grounded.

Description

Technical field [0001] The invention relates to a gas switch technology in a pulse current generator and its application field, in particular to a circuit and method for prolonging the service life of a two-electrode gas switch. Background technique [0002] The two-electrode gas switch has obvious advantages of conducting large current and large Coulomb transfer. Compared with other forms of gas switches, the two-electrode gas switch has the advantage of more uniform electrode ablation, so the service life is more under the same conditions. The two-electrode gas switch is mainly used for the xenon lamp drive power supply of high-power solid neodymium glass lasers, lightning current generators, and various high current generators. [0003] Due to the two-electrode structure, the switch's conduction process is achieved through a faster front edge, and the amplitude is much higher than the negative pulse overvoltage breakdown of the two-electrode gas switch's self-breakdown voltage. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/30
Inventor 杨兰均陈立黄易之刘瞻王鹏程
Owner XI AN JIAOTONG UNIV
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