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

Conventional high-power wireless power transfer (WPT) systems that are required to deliver power over a wide operating range suffer from issues like hard switching, poor current sharing, and unwanted cross-coupling issues. This article proposes a new resonant inductor integrated-transformer-based multi-inverter to improve the WPT power rating without compromising performance. Viable modulation schemes of the proposed system are analyzed, and a hybrid modulation scheme is proposed for wide-range power regulation. To further investigate the feasibility of the proposed system, the power transfer capacity, current sharing among multiple inverters, and the soft switching regions are studied. A 14-kW LCC-LCC WPT experimental system with three parallel inverters is built, which achieves 93.5% efficiency, demonstrating the high performance of the proposed system. This article is accompanied by a video demonstrating these experiments.

Automated summary

This paper proposes a multi-inverter system based on resonant inductor integrated transformers to improve the power rating of WPT without compromising performance. The feasibility and performance of the proposed system are demonstrated through analysis and experiments, achieving high efficiency and power transfer capacity for wide-range power regulation.