Optimizing parallel connection of Medium Frequency inverters for EV Wireless Charging

Wireless battery charging has recognized advantages over conductive charging and is the preferred solution for driverless electric vehicles of the near future. At present, the powers transferred through the two systems are standardized in the power series 3.7 - 7.4 - 11 - 22 kW. From the justified desire that the duration of the loading process be comparable to the duration of the petrol supply of conventional vehicles with internal combustion engines, fast charging systems have been developed that can transmit power that reaches hundreds of kW. The paper analyzes the possibility of economically realizing a high power wireless charging by mounting in parallel “n” identical inverters modules, controlled by a robust and adaptive control loop. The conditions for achieving a smart adaptive micro-grid are met. A new topology for power circuits and a control structure for micro-grid-connected inverters with non-shock-free operation and balanced distribution of power and current between inverters is proposed.