Vehicle-to-Grid On-Board Charger using SiC MOSFET and High Frequency Coaxial Transformer

This paper proposes a multifunctional electric vehicle (EV) on-board charger which can provide three ancillary functions of static-compensator (STATCOM), voltage regulation and current harmonics reduction (APF operation) while operating in G2V/V2G mode. The proposed EV charger exhibits a lower power loss due to using SiC based MOSFETS and a high-efficient high frequency coaxial transformer (HFCT), and lower battery stress because of employing an interleaved two-leg buck-boost dc/dc converter (ITBBC). Different operational modes of the EV charger and its improved performance are validated through both simulation and experimental results.