A Method of Creating the High-Voltage Circuit Model of Metal–Oxide Varistor for the Simulation of Square Pulse Forming

Abstract

Metal-oxide varistor (MOV) is a kind of special ceramic which can be used for square pulse forming based on its nonlinear electrical characteristics. The square pulse forming concept based on MOV has been explored and shows a good prospect in the miniaturization of the pulsed power systems. Circuit simulations are usually necessary to verify the forming effect before experiments. This brief describes a new high-voltage equivalent circuit model of MOV, the determination of the model parameters, and its implementation in PSpice. Two test experiments based on single chip MOV and multiple MOVs in series were carried out to test the new model, and the simulation and experiment results showed good consistency. This new model can be applied in further simulation studies of the square pulse forming based on MOV, for example, to improve the efficiency of the experiments.