Abstract
Core saturation is a critical problem of high-power-level wireless charging. A coil-based desaturation strategy is proposed to desaturate the core without increasing the ferrite thickness or changing the original coil design. Planar coil and solenoids are connected in series with a capacitor to achieve a capacitive quasi-resonating status. The planar coil generates an enhancement magnetic field in phase with the transmitting field. The solenoids generate a canceling magnetic field with the phase opposite to its incident magnetic field from the ferrite. The desaturation strategy’s principles, structure, and circuit analysis are explained and discussed. A scaled-down prototype is fabricated, and the desaturation effectiveness of the proposed strategy is verified both by finite element analysis (FEA) and experimental results.
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