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http://dx.doi.org/10.17661/jkiiect.2021.14.1.48

A Study on Coil Misalignment in a 3-Coil Magnetic Resonance Wireless Power Transmission System of a Electric Vehicle  

Hwang, In-Gab (Department of Electrical and Electronic Engineering, Jeonju University)
Publication Information
The Journal of Korea Institute of Information, Electronics, and Communication Technology / v.14, no.1, 2021 , pp. 48-55 More about this Journal
Abstract
The 3-coil magnetic resonance wireless power transmission system was analyzed using an equivalent circuit model, and the |S21| of the system was expressed as the equation of the Q of the three coils, the coupling coefficient k between the transmitting coil and the relay coil, the relay coil and the receiving coil. It is suggested that the maximum efficiency can be obtained when the relay coil is located in the center of the transmitting and the receiving coil. When the distance between the transmitting and the receiving coil is 30 cm and the two coils are aligned, maximum efficiency of 9 % is obtained with the relay coil centered between the coils. If the transmitting coil and the receiving coil are misaligned during a wireless charging of an electric vehicle, the efficiency is expected to decrease significantly compared to the aligned case. It is expected that the efficiency can be increased by using a relay coil and by rotating the coil.
Keywords
Magnetic; Misalignment; Power; Resonance; Wireless;
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1 A. Kurs, A. Karalias, R. Moffatt, J. D. Joannopoulos,, P. Fisher, M. Soliacic, "Wireless power transfer via strongly coupled magnetic resonances", Science, vol. 317, no. 5834, pp. 83-86, July, 2007.   DOI
2 D. S. Lee, D. N. Lim, S. J. Jeon, "Wireless Power Transfer System Insensitive to Pickup's Posture", KIEE Trans., Vol. 63, No. 7, pp. 910-915, 2014.   DOI
3 D. G. Kim, C. H. Seo, "Omnidirectional Resonator in Three-dimensional using a Globular Structure for Wireless Power Transfer", Journal of The institute of Electronics and Information Engineers, Vol. 53, No. 1, pp. 22-26, Jan. 2016.   DOI
4 S. M. Baek, D. E. Kim, J. G. Shon, "Analysis of the Efficiency According to Resonant Repeater Application in Magnetic Resonant Wireless Power Transfer System", KIEE Trans., Vol. 67P, No. 4, pp. 221-226, Dec., 2018.
5 S. H. Jeon, Y. H. Kim, M. L. Lee, S. Y. Kang, "Circuit Model Based Analysis of a Wireless Energy Transfer System via Coupled Magnetic Resonances", KIPE Trans., Vol. 16, No. 2, pp. 137-144, April, 2011.
6 G. B. Lee, W. S, Y. Park, "Analysis and Comparison for 4-Coil Magnetic Resonance Wireless Power Transfer System", The Journal Korean Institute of Electromagnetic Engineering and Science, Vol. 24, No. 2, pp. 168-179, Feb. 2013.   DOI
7 J. W. Kim, H. H. Ji, Y. G. Choi, Y. H. Yun, K. H. Kim, Y. J. Park, "Study on Arrangement of Self-Resonant Coils in Wireless Power Transfer System Based on Magnetic Resonance", The Journal Korean Institute of Electromagnetic Engineering and Science, Vol. 21, No. 6, pp. 564-572, June. 2010.   DOI
8 M. Kiani. U. M. Jow, M. Ghovanloo, "Design and Optimization of a 3-Coil Inductive Link for Efficient Wireless Power Transmission", IEEE Trans. Biomed. Circuits Syst., Vol. 5, No. 6, pp. 579-591, Dec. 2011.   DOI
9 D. G. Kim, C. H. Seo, "Design of 3-Dimensional Magnetic Resonance Coil and DC-DC Buck Converter for Uniform Wireless Power Transmission of a Smartphone", Journal of The institute of Electronics and Information Engineers, Vol. 57, No. 12, pp. 935-940, Dec. 2020.