A large air‐gap wireless DC/DC charger for an electric vehicle (EV) is suggested. It is controlled by pulse width modulation (PWM) with a self‐resonant frequency formed by self‐inductance and a resonant capacitor so that constant frequency operation can be accomplished under a large air‐gap without an additional current chopper. The feasibility of the proposed method has been verified with a 6.6 kW prototype with an air‐gap of 12–20 cm.
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Lee et al. (2014) studied this question.
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