Wireless Power Transfer pp 217-291 | Cite as

# Magnetic Resonance Coupling Systems

- 23 Downloads

## Abstract

A magnetic resonance coupling circuit is a circuit topology (circuit structure) that can achieve high efficiency and high power even in the presence of large air gaps. However, when considering the design of these systems, it is important to achieve both high efficiency and the desired power simultaneously. The desired power refers to the amount of power required by the load on the receiver side. For example, to achieve the maximum efficiency, it is necessary to set the load equal to the optimal load. Consequently, the optimal load determines the amount of power received. Therefore, the amount of power that arrives at the receiver side is not necessarily equal to the desired power. However, if the value of the load is adjusted so that the power becomes equal to the desired power, then the efficiency will not always be equal to the maximum efficiency. In this chapter, we verify these tradeoffs and describe methods to overcome them.

## References

- 1.K. Takuzaki, N. Hoshi, Consideration of operating condition of secondary-side converter of inductive power transfer system for obtaining high resonant circuit efficiency. The Trans. Inst. Electr. Eng. Jpn. D, A Publ. Ind. Appl. Soc.
**132**(10), 966–975 (2012)Google Scholar - 2.D. Gunji, T. Imura, H. Fujimoto, Stability analysis of secondary load voltage on wireless power transfer using magnetic resonance coupling for constant power load, IEE Jpn. Ind. Appl. Soc. Conf. 2–15, 139–142 (2014)Google Scholar
- 3.Y. Moriwaki, T. Imura, Y. Hori, A study on reduction of reflected power using DC/DC converter in wireless power transfer system. IEEJ, JIASC
**2**, II-403–II-406 (2011)Google Scholar - 4.T.C. Beh, M. Kato, T. Imura, S. Oh, Y. Hori, Automated impedance matching system for robust wireless power transfer via magnetic resonance coupling. IEEE Trans. Ind. Electron.
**60**(9), 3689–3698 (2013)Google Scholar - 5.M. Kato, T. Imura, Y. Hori, Study on maximize efficiency by secondary side control using DC–DC converter in wireless power transfer via magnetic resonant coupling, in
*EVS27*(IEEE, 2013), pp. 1–5Google Scholar - 6.K. Hata, T. Imura, Y. Hori, Maximum efficiency control of wireless power transfer using secondary side DC–DC converter for moving EV in long distance transmission. IEICE Technical Report WPT2014-33 (2014), pp. 51–56Google Scholar
- 7.D. Kobayashi, T. Imura, Y. Hori, Real-time maximum efficiency control in dynamic wireless power transfer system. Trans. Inst. Electr. Eng. Jpn. D Publ. Ind. Appl. Soc.
**136**(6), 425–432 (2016)Google Scholar - 8.T. Hiramatsu, X. Huang, M. Kato, T. Imura, Y. Hori, Independent control of maximum transmission efficiency by the transmitter side and power by the receiver side for wireless power transfer. Trans. Inst. Electr. Eng. Jpn. D Publ. Ind. Appl. Soc.
**135**(8), 847–854 (2015)Google Scholar - 9.D. Gunji, M. Sato, T. Imura, H. Fujimoto, Experimental validation of load voltage control method using secondary converter for wireless power transfer by magnetic resonance coupling, in
*IEICE Society Conference 2014*, BI-8-4 (2014), pp. 61–62Google Scholar - 10.D. Gunji, T. Imura, H. Fujimoto, Fundamental research of power conversion circuit control for wireless in-wheel motor using magnetic resonance coupling, in
*40th Annual Conference of the IEEE Industrial Electronics Society*(2014), pp. 3004–3009Google Scholar - 11.D. Gunji, T. Imura, H. Fujimoto, Fundamental research on control method for power conversion circuit of wireless in-wheel motor using magnetic resonance coupling. Trans. Inst. Electr. Eng. Jpn. D Publ. Ind. Appl. Soc.
**135**(3), 182–191 (2015)Google Scholar - 12.G. Yamamoto, D. Gunji, T. Imura, H. Fujimoto, Basic Study on maximizing power transfer efficiency of wireless in-wheel motor by primary and load-side voltage control. Trans. Inst. Electr. Eng. Jpn. D Publ. Ind. Appl. Soc.
**136**(2), 118–125 (2016)Google Scholar - 13.G. Lovison, M. Sato, T. Imura, Y. Hori, Secondary-side-only control for maximum efficiency and desired power in wireless power transfer system, in
*41st Annual Conference of the IEEE Industrial Electronics Society*(2015), pp. 4825–4829Google Scholar - 14.K. Hata, T. Imura, Y. Hori, Dynamic wireless power transfer system for electric vehicles to simplify ground facilities—power control and efficiency maximization on the secondary side, in
*The 31st Applied Power Electronics Conference and Exposition*(2016), pp. 1731–1736Google Scholar - 15.V. Jiwariyavej, T. Imura, Y. Hori, Coupling coefficients estimation of wireless power transfer system via magnetic resonance coupling using information from either side of the system, in
*The 2012 International Conference on Broadband and Biomedical Communications*(2012)Google Scholar - 16.M. Tsuboka, J. Vissuta, T. Imura, H. Fujimoto, Y. Hori, Secondary parameter estimation for wireless power transfer system using magnetic resonance coupling. IEEJ Tech. Meet. Industr. Instrum. Control, IIC-12-063, 77–80 (2012)Google Scholar
- 17.D. Kobayashi, T. Imura, Y. Hori, Coupling coefficient estimation using impedance inverter coil in dynamic wireless power transfer system for electric vehicles. IEICE Technical Report WPT2014-54, pp. 21–26 (2014)Google Scholar
- 18.K. Hata, T. Imura, Y. Hori, Fundamental study on dynamic wireless power transfer system for electric vehicle to simplify ground facilities: primary voltage estimation based on secondary side information. IEICE Technical Report WPT2014-53, pp. 17–20 (2014)Google Scholar
- 19.V. Jiwariyavej, T. Imura, Y. Hori, Coupling coefficients estimation of wireless power transfer system via magnetic resonance coupling using information from either side of the system. IEEE J. Emerg. Sel. Top. Power Electron.
**3**(1), 191–200 (2015)Google Scholar