A CM EMI Suppression Strategy for the Single-Phase Inverter Based on the Si/SiC Hybrid Switch

Numerous studies have shown that the Si IGBT/SiC MOSFET hybrid switch has been verified to be a high efficiency and cost-effective device for the application of the inverter. In fact, the high switching frequency of the SiC MOSFET means high dv/dt, which will generate severe common mode electromagnetic interference (CM EMI). Meanwhile, it would lead to some malfunction of the power converter. In order to suppress the CM EMI of the single-phase inverter based on the Si/SiC hybrid switch, a CM EMI suppression strategy combining the variable switching patterns and the variable switching frequency is proposed. Furthermore, the feasibility of the proposed method has been verified by experimental results distinctly.