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A current-fed quasi Z-source inverter with SiC power modules for EV/HEV applications

This paper presents a comparative study between a conventional boosted-VSI electric/hybrid electric vehicle (EV/HEV) powertrain converter with alternative topologies including bidirectional CSI, Silicon (Si)-based current-fed Quasi Z-Source Inverter (CF-qZSI), and Silicon Carbide (SiC)-based CF-qZSI. The higher switching frequency operation of SiC MOSFETs enables the size reduction of reactive elements necessary for bi-directional power flow through the input Z-network, and results in higher efficiency and power density of the overall system. Research results support this claim, bolstering the possibility to replace conventional VSIs with CSIs in the future using wide bandgap (WBG) devices.