All solid-state, switched pulser for air pollution control system

Abstract

This paper describes an all solid-state switched pulser for an air pollution control system. The proposed pulser can produce 20 kV, 500 A, 100 ns pulses at repetition rates up to 10 kHz, and it is composed of 30 series connections of power circuit card assemblies which contain paralleled MOSFETs, energy storage capacitors and pulse transformer. Higher pulse voltages and currents can easily be obtained by increasing the numbers of series and parallel connections of power circuit cards and MOSFETs, respectively. This paper places emphasis on the overvoltage and the overcurrent protections including short circuit conditions for reliable operation in real situations. Experimental results show that the proposed pulser is very efficient in air pollution control application and could be useful for other applications such as synthesis of nanosize powders and nonthermal food processing.