Analysis, design, and characterization of wireless power transfer systems using conical coils

In this paper, we present the analysis, design, and characterization of wireless power transfer (WPT) systems that use planar and conical coils. It is shown that the conical coils have superior performance in terms of self-resonant frequency and quality factor as compared to their planar coil counterparts. A power transfer efficiency of up to 53.9% is achieved for a 4-coil WPT system employing conical coil resonators that are 50 cm apart (which translates into a separation distance of ~1.5× the diameter of the resonators). In contrast, the same system using planar resonators achieves a power transfer efficiency of 32.8%. Thus, employing conical coils improves the power transfer efficiency by a factor of up to 1.6×.

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