Improvement of 85 kHz Self-resonant Open End Coil for Capacitor-less Wireless Power Transfer System

The characteristics of a wireless power transfer system depend on the coils. Resonant coil is used for wireless power transfer in the case of magnetic resonant coupling type. Resonant capacitor used for compensation has to withstand high voltage, which is applied to resonant capacitor because of high Q coil, and can cause breakdown accident. Capacitor-less wireless power transfer can prevent this accident. In case of wireless power transfer for electric vehicles, 85 kHz is used as resonant frequency. In this paper, design method of self-resonant open end coil which resonate at 85 kHz is proposed. Characteristics of the proposed coil are verified by experiment.

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