RC Snubber Design by Multi-objective Particle Swarm Optimization for SiC-MOSFET Switching Oscillation

Abstract

Switching oscillation of the SiC MOSFET would affect the stable operation of the converter. RC snubber could be used to suppress switching oscillation. Based on high-frequency equivalent circuit of half-bridge, an optimization model solved by multi-objective particle swarm optimization (MOPSO) is presented to minimize percentage overshoot (PO) and settling time (Ts) of the drain-source voltage (Vds). As a method that considers the time domain response, it is applicable to equivalent circuits of arbitrary order. The calculation results provide the selectivity of the optimal RC parameters. Simulation results in MATLAB/SIMULINK have verified the effectiveness of the method. After RC snubber is applied, PO and Ts of Vds are reduced by 41.2% and 91.5%, respectively.