Wireless power transfer system based on toroidal metamaterials

Zhao Jun-Fei; Zhang Ye-Wen; Li Yun-Hui; Chen Yong-Qiang; Fang Kai; He Li

doi:10.7498/aps.65.168801

Abstract

Now, the traditional four-coil magnetic coupling systems have been used in the wireless charging of mobile electronic devices and electric vehicles. However, the system efficiency is difficult to improve due to the divergence of spatial distribution of magnetic field. To overcome this disadvantage, we propose an efficient system based on the toroidal metamaterials, which support a resonant electromagnetic mode that is dominated by the toroidal moment. The toroidal moment is produced by currents flowing on the surface of a torus along its meridian. It presents remarkable ability to localize the field and suppress the radiation. This new toroidal magnetic mode system (TMMS) consists of four asymmetric split resonant rings (ASRRs). Pairs of ASRRs in the same unit (transmit unit and receiver unit) have mirror symmetry about the yz plane. Pairs of ASRRs in different units have 180 rotational symmetry about the x axis. These four rings support the toroidal magnetic resonant mode (dominated by toroidal moment). For comparison, we also construct two symmetric split resonant rings to imitate the four-coil system (FCS). It supports parallel magnetic mode (dominated by magnetic dipole moment) and antiparallel magnetic mode (dominated by magnetic dipole moment and magnetic quadrupole moment). To confirm the improvement of efficiency, we compare the transmission of the TMMS with that of the FCS at the same transfer distance (10 mm). The TMMS presents a higher transmission and the increase in simulation (experiment) is 81% (40%). The toroidal magnetic mode in the TMMS also exhibits low metal loss, which is reflected in these spectra. The simulated distributions of magnetic field line corresponding to the resonantly magnetic modes in both systems are provided in this article. Instead of divergence in FCS, the magnetic field lines of TMMS are well constrained around the four rings and form closed loops along these rings. The density of the field line and the magnitude of field near the receiving coil are both enhanced. So the system efficiency, which is determined by the magnetic flux of the receiving coil, is improved. The dispersions of radiation power for various induced multipole moments from the two systems are also calculated. The dominance of toroidal moment corresponding to the resonant mode in TMMS is verified and the radiation is suppressed to 1/4 of FCS. Finally, the transmissions of two systems at different transfer distances are presented. The toroidal magnetic mode system presents a higher efficiency at strong coupling area (0-25 mm). The average increase of the transmission in simulation (experiment) is 73% (46%). In summary, the proposed new system exhibits the properties of high efficiency, low metal loss and low radiation loss with the multiport output. It would have broad prospects of practical application in WPT.

Keywords:

Authors and contacts

1.
School of Physics Science and Engineering, TongJi University, Shanghai 200092, China;
2.
College of Electronics and Information Engineering, TongJi University, Shanghai 200092, China

Corresponding author: Zhang Ye-Wen, yewen.zhang@tongji.edu.cn

Funds: Project supported by the National Basic Research Program of China (Grant No. 2011CB922001) and the National Natural Science Foundation of China (Grant Nos. 51377003, 11234010).

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Cited By

[1]	Kurs A, Karalis A, Moffatt R, Joannopoulos J D, Fisher P, Soljacic M 2007 Science 317 83
[2]	Karalis A, Joannopoulos J D, Soljacic M 2008 Ann. Phys. 323 34
[3]	Hamam R E, Karalis A, Joannopoulos J D, Soljacic M 2009 Ann. Phys. 324 1783
[4]	Oh K S, Lee W S, Lee W S, Yu J W 2012 Appl. Phys. Lett. 101 064105
[5]	Lee W S, Lee H L, Oh K S, Yu J W 2012 Appl. Phys. Lett. 100 214105
[6]	Veselago V G 1968 Sov. Phys. Usp. 10 509
[7]	Shelby R A, Smith D R, Schultz S 2001 Science 292 77
[8]	Schurig D, Mock J J, Justice B J, Cummer S A, Pendry J B, Starr A F, Smith D R 2006 Science 314 977
[9]	Xi S, Chen H, Jiang T, Ran L, Huangfu J, Wu B I, Kong J, Chen M 2009 Phys. Rev. Lett. 103 194801
[10]	Yu J B, Ma H, Wang J F, Li Y F, Feng M D, Qu S B 2015 Chin. Phys. B 24 098102
[11]	Ran J, Zhang Y, Chen X, Fang K, Zhao J, Sun Y, Chen H 2015 Sci. Rep. 5 11659
[12]	Urzhumov Y, Smith D R 2011 Phys. Rev. B: Condens. Matter 83 205114
[13]	Wang B N, Teo K H, Nishino T, Yerazunis W, Barnwell J, Zhang J Y 2011 Appl. Phys. Lett. 98 254101
[14]	Ranaweera A L A K, Moscoso C A, Lee J W 2015 J. Phys. D: Appl. Phys. 48 455104
[15]	Chabalko M J, Ricketts D S 2015 Appl. Phys. Lett. 106 062401
[16]	Li C L, Guo J, Zhang P, Yu Q Q, Ma W T, Miao X G, Zhao Z Y, Luan L 2014 Chin. Phys. Lett. 31 077801
[17]	Yu X F, Sandhu S, Beiker S, Sassoon R, Fan S H 2011 Appl. Phys. Lett. 99 214102
[18]	Wu J, Wang B N, Yerazunis W S, Teo K H 2013 IEEE Wireless Power Transfer Perugia, Italy, May 15-16, 2013 p155
[19]	Zeldovich Y B 1958 Sov. Phys. JETP 6 1184
[20]	Haxton W C 1997 Science 275 1753
[21]	Afanasiev G N 2001 J. Phys. D: Appl. Phys. 34 539
[22]	Kaelberer T, Fedotov V A, Papasimakis N, Tsai D P, Zheludev N I 2010 Science 330 1510
[23]	Dong Z G, Zhu J, Rho J, Li J Q, Lu C G, Yin X B, Zhang X 2012 Appl. Phys. Lett. 101 144105
[24]	Ogut B, Talebi N, Vogelgesang R, Sigle W, van Aken P A 2012 Nano Lett. 12 5239
[25]	Fan Y C, Wei Z Y, Li H Q, Chen H, Soukoulis C M 2013 Phys. Rev. B: Condens. Matter 87 115417
[26]	Fedotov V A, Rogacheva A V, Savinov V, Tsai D P, Zheludev N I 2013 Sci. Rep. 3 2967
[27]	Huang Y W, Chen W T, Wu P C, Fedotov V A, Zheludev N I, Tsai D P 2013 Sci. Rep. 3 1237
[28]	Ye Q W, Guo L Y, Li M H, Liu Y, Xiao B X, Yang H L 2013 Phys. Scr. 88 055002
[29]	Kim N Y, Kim K Y, Kim C W 2012 Microw. Opt. Tech. Lett. 54 1423
[30]	Radescu E E, Vaman G 2002 Phys. Rev. E 65 046609

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Vol. 65, Issue 16 - 2016-08-20

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