Abstract

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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