Optimal parameters design for series-series resonant converter for wireless power transfer

The wireless power transfer (WPT) system for electric vehicles requires high efficiency, lightweight, compact and be suited to big air gap. The WPT system has low coupling coefficient, which is far different from the traditional transformer. Optimal parameters design approach for resonant converter with S-S compensation for WPT is investigated. 85kHz and 20kHz parameters design are introduced in the paper. The validity of the proposed parameters design of 85kHz and 20kHz are verified by experimental results obtained from a 10kW resonant converter prototype with 150mm air gap. Finally the results of 85kHz and 20kHz optimal parameters design experiment are compared.