基于光导开关的激光二极管触发三电极气体开关研究

LD triggered three-electrode gas switch based on photoconductive semiconductor

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83μJ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。

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 83μJ 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.