LD triggered three-electrode gas switch based on photoconductive semiconductor
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摘要: 为实现激光二极管对气体开关的触发，采用从主回路开关两侧取电的基于光导开关一体化激光二极管触发气体开关结构，并对基于光导开关一体化激光二极管触发三电极气体开关进行了初步实验，实现了激光二极管输出能量83 µJ条件下40 kV/8 kA三电极气体开关的可靠触发，证明了技术可行性。但实验中的实测光导开关的工作寿命仅约数百次。Abstract: To trigger the gas switch with one fiber, a kind of LD (laser diode) triggered three--electrode gas switch based on photoconductive semiconductor without trigger charger source is presented in this paper. The principle of this switch is that a GaAs PCSS, which is triggered by LD, is used to control the trigger pulse generation of the trigger capacitor discharge circuit (CDC). The capacitor in CDC is charged with the energy of the main circuit directly. As a result, this switch can work without trigger charge power source, which means this switch can be made more compact compared with traditional electrical trigger switch. A prototype designed for three-electrode gas switch working under 40 kV/8 kA and PCSS triggered with 83 μJ laser energy is described in this paper in detail. The experimental result proves the feasibility of the switch. The experimental result also shows the life of the photoconductive semiconductor is just several hundred shots. The life of the photoconductive semiconductor will be improved in next phase of our research.
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Key words:
- gas switch /
- LD trigger /
- photoconductive semiconductor /
- work life
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图 1 激光二极管触发三电极气体开关的仿真模型图
Figure 1. Simulation circuit of LD triggered three-electrode gas switch
图 2 激光二极管触发三电极气体开关的仿真结果
Figure 2. Simulation results of LD triggered three-electrode gas switch
图 6 激光二极管触发三电极气体开关触发极电压和光导开关电流波形
Figure 6. Waveforms of trigger electrode voltage and PCSS current of LD triggered gas switch
图 7 激光二极管触发三电极气体开关实验的典型波形
Figure 7. Typical waveforms of LD triggered three-electrode gas switch tests
图 8 激光二极管触发三电极气体开关实验的重频实验波形
Figure 8. Repetition frequency experiment waveform of LD triggered gas switch
表 1 不同触发光脉宽和能量的实验结果
Table 1. Results of different laser width and energy experiments
Vc/kV laser width/ns laser energy/μJ misfire delay/ns jitter/ns 40 90 83 0 312 28.5 40 45 41 1 314 29.1 40 22 19 9 361 93.0 
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