Development of High Efficiency and Power Density Converter using SiC MOSFET for xEV

The development of 50kW converter system using SiC MOSFET is proposed in this paper. SiC MOSFET can operate with lower conduction losses and switching losses, compared with conventional silicon-based MOSFETs. The 50kW battery charger consists of two 25kW AC/DC modular converters and four 12.5kW DC/DC LLC converters. The implementation of SiC MOSFET enables to design AC/DC converters and LLC converters with high-efficiency and high-power density. The performance of proposed converters is validated through simulations and experimental results. The maximum efficiency of AC/DC and DC/DC converter are 99% and 97.9% respectively.