The Designing Of High Frequency And High Voltage Square Pulsed Power Based On MOSFET In Series

With the development of pulsed power technology in the civilian use area, itsrequirement is higher than before, such as high repetition rate, ns level rising edge, long lifeetc. Traditional switches can’t be used in the high frequent circumstance. Althoughsemiconductor devices can make up for the deficiency, its voltage endurance and currentcapacity is limited. In order to enhance voltage endurance and current capacity, series andparallel method is adopted. In pulsed power technology, there is a very importantindex--the rising edge. The opening speed of semiconductor device affects the rising edgeof the waveform. It relates to the design of its driver. So the design of semiconductor’sdriver is very important. In the semiconductor, the opening speed of MOSFET is the fastest.This paper puts forward the way of a high frequency and high voltage pulse square wavepower based on MOSFET in series. Its output frequency can adjust from10kHz to30kHzand its output amplitude voltage can change between0to8kV.The article detailed describes the design of the adjustable high voltage dc and thedesign of MOSFET series switch. The adjustable high voltage dc adopts the BOOST loopand the series resonant charging loop. The design of high frequency transformer, pulsedtransformer and inductance use AP method. The design of MOSFET series switch needs totake into account four aspects, namely, device’s choosing, device’s display, the design ofdriver and voltage-divided, among which, the design of MOSFET series switch’s driver isthe key factor, to some extent, this decides the switch’s success or failure. The article driveruses a high power MOSFET controlling16transformers in series outputting. The highpower MOSFET’s driver signal coming from M57962L whose controlling signal is givenby TL494. Besides, it also describes the design of the static divide voltage and dynamicdivided voltage measures.The designed power supply discharging in the17.1k water resistor at the frequency of14.8kHz, a square wave with the rising edge of100ns was obtained. The power supplycan work a long time.