Leakage emulator intended for electromagnetic field leaked from wireless power transfer system

Kanasaki, Yoshihiro; Yui, Tatsunori; Uno, Hiroyuki; Ikeda, Kazuhiko; Sugita, Y.

doi:10.1109/wpt.2015.7140126

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…Among current coils for WPT, the Q-factor of the circular spiral coil has been studied for the implementation of the resonator. [3][4][5][6][7] The Q-factors of other coil shapes have also been investigated, for example, the planar Polygonal Spiral Coil (PSC). [8][9][10][11][12][13][14] Currently, most of the PSCs consist of one or two coil layers.…”

Section: Introductionmentioning

confidence: 99%

A polygonal double-layer coil design for high-efficiency wireless power transfer

et al. 2018

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In this work, we present a novel coil structure for the design of Wireless Power Transfer (WPT) systems via magnetic resonant coupling. The new coil consists of two layers of flat polygonal windings in square, pentagonal and hexagonal shapes. The double-layer coil can be conveniently fabricated using the print circuit broad (PCB) technology. In our design, we include an angle between the two layers which can be adjusted to change the area of inter-layer overlap. This unique structure is thoroughly investigated with respect to the quality factor Q and the power transfer efficiency (PTE) using the finite element method (FEM). An equivalent circuit is derived and used to explain the properties of the angularly shifted double-layer coil theoretically. Comparative experiments are conducted from which the performance of the new coil is evaluated quantitatively. Our results have shown that an increased shift angle improves the Q-factor, and the optimal PTE is achieved when the angle reaches the maximum. When compared to the pentagonal and hexagonal coils, the square coil achieves the highest PTE due to its lowest parasitic capacitive effects. In summary, our new coil design improves the performance of WPT systems and allows a formal design procedure for optimization in a given application.

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