Design and Test of Pulsed Power Supply

Abstract

AbstractA multi-function pulsed power supply with the detection circuit of the discharge state is designed and developed by using transistor switches for deionization, a FPGA (field-programmable gate array) as pulse generator, and a SCM (single-chip microcomputer) for setting pulsed parameters. By matchings the switches and discharge capacitors, the discharge circuit unit can be configured as various pulse-control forms including single-switch chopper mode, two-switch chopper mode, Tr-RC mode (controllable RC with single-switch), and controllable RC with two switches. By controlling the switch logic, the work mode of discharge pulse can be exchanged to equal pulse mode or equal energy mode. A snubber circuit is designed for avoiding turn-on and turn-off wear of MOSFET switches at high frequency. Besides, a novel pulsed power supply is designed and developed for realizing the ns-pulsewidth with controllable pulsewidth and peak voltage. The key novelty lies in a cascaded circuit with two triodes working in the state of ultra-fast avalanche conduction, where pF capacitors are applied to adjusting the pulsewidth and pulsed energy precisely. Performance tests verified that a single pulse of 5 ns pulsewidth or continuous pulses up to 9 MHz can be outputted. A single pulsed energy can reach down to 1.75 nJ by outputting a pulsewidth of 10 ns.KeywordsPulsed power supplyTransistor switchDetection circuitNanosecond pulsewidthSnubber circuit