Wireless Bidirectional Power Transfer for E-Vehicle Charging System

The focus of this study is to develop a bidirectional wireless charging system for E-Vehicles (EV). The bidirectional DC-DC converter employs the LCC resonant circuit designed separately for the source and the vehicle. With the use of bidirectional power electronic device, the converters act as inverters or rectifiers according to the requirement or the direction of power flow. The grid side DC link voltage is maintained at 700–800V for 3phase, on the other hand, the DC link voltage of the batten* side is 350–400V for the efficient power transfer. The proposed converter is designed for 10KW. The switching frequency 25kHz reduces the size and volume of energy storing elements. The proposed circuit is designed and simulated to verify various parameters such as power transfer capacity, load variation, efficiency, and sensitivity. The results indicate that the efficiency of DC-DC converter is 97.2% when the power flows from grid to vehicle, whereas the efficiency is found to be 97.4% for the vice versa.