Electric Vehicle Related Technologies. A Charger with a Magneto-Inductive Connector.

An international standard for a magneto-inductive charging system of EVs is being examined. According to the draft, a transformer is completely divided into primary side and secondary side, it's operating frequency is from 80kHz to 300kHz, and it's efficiency is assumed 99.5%. For a battery charging system for EVs to realize these requirements, we tried to build a prototype equipment that consists of soft switching inverter with inductor commutation of 20kW 100kHz output and a magneto-inductive transformer, and examined it experimentally. As a result of the experiment, the prototype equipment adopting this magneto-inductive charging circuit achieved an efficiency of 91.8%.