A Multi-Inverter High-Power Wireless Power Transfer System with Wide ZVS Operation Range

Conventional high-power wireless power transfer (WPT) systems suffer from hard switching, current sharing, and crossing coupling issues when providing a wide-range power supply. To improve the power level and regulation performance, we propose a new resonant inductor integrated-transformer based multi-inverter (RIIT-MI) topology for the high-power WPT system. A flexible power capacity can be achieved by increasing the number of inverters. A wide power regulation range with soft switching can be achieved without adding additional components. Excellent current sharing can be realized despite a wide range of power variations. A 14-kW LCC-LCC WPT experimental system with three parallel inverters is built and the overall efficiency reaches 93.5%, demonstrating the high performance of the proposed system.