A dynamic wireless power transfer (WPT) system for electric vehicles can extend their cruising distance and reduce the size of their energy storage system. Power control and efficiency maximization of WPT are preferable to be controlled on the secondary side because ground facilities of the dynamic charging system have to be simplified. Although previous research has proposed a secondary-side simultaneous control of the maximum efficiency and the desired power, the battery charging current cannot be controlled directly. In this paper, a novel secondary-side control method for power control and efficiency maximization is proposed. The battery charging power is controlled by the DC-DC converter and the transmitting efficiency is maximized by Half Active Rectifier. These control strategies and the controller design are proposed based on the WPT circuit analysis and the power converter model. The effectiveness of the proposed method is verified by simulation and experiment.
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Hata et al. (2016) studied this question.
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