An Electric Vehicle Charging Station Based on SiC MOSFETs and Si IGBTs Hybrid Cascaded Three-Level H-Bridge Converter

To reduce the cost of all-silicon carbide (SiC) MOSFETs based electric vehicle charging station, an electric vehicle charging station based on SiC MOSFETs and silicon (Si) IGBTs hybrid cascaded three-level H-bridge converter is proposed in this paper. The proposed charging station consists of high voltage stage, isolation stage and low voltage stage. In this topology, only two SiC MOSFETs are employed in the high voltage rectifier and all the high frequency switching events are concentrated on SiC MOSFETs by using a specialized modulation scheme. Meanwhile, batteries are integrated in the system which are used as energy storage units. LLC converters are employed in the isolation stage which provide the electrical isolation and power transmission and a low voltage dc bus is built by connecting the outputs of the LLC converter in parallel. The electric vehicles and low voltage energy storages are connected to this low voltage dc bus by using dc/dc converters. A simulation model is built in MATLAB/Simulink and the simulation results show the validations of the proposed electric vehicle charging station.