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.

传统大功率无线电能传输（WPT）系统在实现宽范围供电时，存在硬开关、电流均分与交叉耦合等技术难题。为提升功率等级与调节性能，本文针对大功率WPT系统提出一种新型谐振电感集成变压器型多逆变器（RIIT-MI）拓扑。通过增加逆变器并联数量，可灵活拓展系统功率容量；无需额外增设元件，即可实现具备软开关特性的宽功率调节范围；即便功率在大范围波动，仍可实现优异的电流均分效果。搭建了含三台并联逆变器的14kW LCC-LCC型WPT实验系统，其整体效率可达93.5%，验证了所提系统的优异性能。