Modeling and Analysis of SiC MOSFET Switching Oscillations

Abstract

SiC MOSFETs exhibit extremely fast switching characteristics, which are unfortunately accompanied by undesirable switching oscillations. In this paper, equivalent circuit models incorporating all parasitic elements are developed for the turn-ON and turn-OFF of a SiC MOSFET. Simple mathematical formulas are derived to provide the theoretical analysis of the switching oscillation phenomenon, and to guide the snubber or damping circuit design. Both circuit simulation and experimental measurement are carried out to validate these simple equivalent circuit models.