A new wireless EV charger with communication function by S/SP transfer circuit

In recent years, as an eco-friendly EV charging system, the wireless charging has become a topic due to the merits such as convenient, safety, and clean. In this paper, in order to realize a large-gap wireless charger which can communicate between the power feeding and receiving units without any additional communication device, a wireless power transfer (WPT) system using a single-ended push-pull (SEPP) inverter and Series/Series-Parallel(S/SP) transfer circuit with communication function has been proposed. Described is a design strategy that ensures the target output power and efficiency of wireless power transfer under the large gap condition. With a communication method by switching over the paralleled capacitor in receiving circuit to modulate the magnetic field, a communication with high accuracy is enabled. The results of design and simulated characteristics are discussed herein as a practical point of view.