Reconfigurable Transmitter Coil Structure for Highly Efficient and Misalignment-insensitive Wireless Power Transfer Systems in Megahertz Range*

Chinese Journal of Electrical Engineering ›› 2019, Vol. 5 ›› Issue (2): 56-62.

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Reconfigurable Transmitter Coil Structure for Highly Efficient and Misalignment-insensitive Wireless Power Transfer Systems in Megahertz Range^*

Lihao Wu, Bo Zhang^*

School of Electric Power, South China University of Technology, Guangzhou 510641, China

Online:2019-06-20 Published:1900-01-01
About author:Lihao Wu was born in Gutian, Fujian, China, in 1994. He received a B.S. degree in electrical engineering from Fuzhou University, Fuzhou, China, in 2017. He is currently working toward the Ph.D. degree in power electronics at the School of Electric Power, South China University of Technology, Guangzhou, China.
His research interests include wireless power transfer applications and power electronic converters.
Bo Zhang (M'03-SM'15) was born in Shanghai, China, in 1962. He received a B.S. degree in electrical engineering from Zhejiang University, Hangzhou, China, in 1982, an M.S. degree in power electronics from Southwest Jiao Tong University, Chengdu, China, in 1988, and a Ph.D. degree in power electronics from the Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 1994.
He is currently a professor with the School of Electric Power, South China University of Technology, Guangzhou, China. He has authored or co-authored six books published by IEEE-Wiley and Springer, over 450 technical papers, and he holds 100 patents. His current research interests include nonlinear analysis, modeling, and control of power electronic converters and wireless power transfer applications.
Supported by:
epbzhang@scut.edu.cn

Abstract

Abstract: The structural optimization of coils is a key issue in wireless power transfer (WPT) applications owing to size limitations. In this study, a novel planar-spiral transmitter coil (TX-coil) with an outer-tight and inner-sparse configuration is proposed to achieve a high quality factor (Q-factor) and uniform magnetic field, which ensures high efficiency and improves the misalignment tolerance for several-megahertz WPT systems. Furthermore, a closed-form expression for the Q-factor is provided and analyzed for coil optimization. By using this method, a TX-coil with an outer diameter of 100 mm and a wire diameter of 1.5 mm is designed and tested at 1 MHz. Finite element method simulations and experimental results demonstrate that the Q-factor is increased by about 8% in comparison with evenly spaced planar spiral coils, which is achieved while ensuring a relatively uniform magnetic field.

Key words: High quality factor, planar spiral coil, structure optimization, uniform magnetic field, wireless power transfer

Lihao Wu, Bo Zhang. Reconfigurable Transmitter Coil Structure for Highly Efficient and Misalignment-insensitive Wireless Power Transfer Systems in Megahertz Range^*[J]. Chinese Journal of Electrical Engineering, 2019, 5(2): 56-62.

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Reconfigurable Transmitter Coil Structure for Highly Efficient and Misalignment-insensitive Wireless Power Transfer Systems in Megahertz Range^*

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