Design of High Voltage and Large Current Trigger Source for Trigger Vacuum Switch

Abstract

The field breakdown type triggered vacuum switch has been widely used in the field of pulse power technology because of its advantages of high rated voltage and high rated current. However, compared with the surface breakdown type triggered vacuum switch, the field breakdown type triggered vacuum switch has higher requirements on the trigger pulse. The widely used trigger source has low trigger voltage steepness and low trigger current, leading to large trigger delay and discreteness. Therefore, the design of a high voltage and high current trigger source based on full wave voltage doubling rectifier circuit and low variable ratio pulse transformer is crucial for the field breakdown type TVS. The trigger source first charges high voltage to the energy storage capacitor through the voltage doubling rectifier circuit, and then discharges to the trigger gap through the low-variable ratio pulse transformer. Thus high steep trigger voltage and large trigger current pulse can be obtained. This paper introduces the working principle of the trigger source, analyzes and designs the voltage doubling rectifier circuit and pulse transformer in detail, and verifies the feasibility and effectiveness of the design scheme through experiments.