An EMI Suppression Strategy for Si/SiC Hybrid Switch Based Single-Phase Inverter

Because of the higher switching speed of the SiC MOSFET, Si IGBT/SiC MOSFET hybrid switch at conventional switching pattern may engender serious common-mode (CM) electromagnetic interference (EMI) issue, resulting in a serious reliability problem of the inverters. In this paper, with the help of lower switching speed of the Si IGBT and variable switching frequency control strategy, a novel CM EMI suppression strategy is proposed to suppress the CM EMI noise of the Si IGBT/SiC MOSFET hybrid switch based single-phase inverter. Experimental results can verify the feasibility of the proposed strategy.