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Analysis on transmission characteristics of wireless power transmission system based on magnetic resonant coupling


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Analysis on transmission characteristics of wireless power transmission system based on magnetic resonant coupling
Li WeixinZhang He
ZNDY of Ministerial Key Laboratory,NUST,Nanjing 210094,China
magnetic resonant coupling wireless power transmission resonance frequency frequency splitting
TM724; TN919
In order to improve energy transmission efficiency of wireless power system based on magnetic resonant coupling,the relationship between transmission efficiency and coupling distance is researched studying the transmission characteristics of wireless power system.The equivalent circuit model of wireless power transmission system via magnetic resonance coupling is analyzed contactless based on the two-port network analysis method.The condition of the resonant frequency splitting phenomenon is produced,a contactless power transmission system is deduced,and the frequency expression of maximum efficiency is derived.The transmission characteristics of this system are researched using numerical simulation.The law that two quite different resonant frequencies turn into one until the critical condition is revealed and resonant frequency is increased gradually with the coupling distance under the condition of optimum efficiency.Experimental results show that the transmission characteristics are consistent with theoretical analysis and simulation.The model can describe the transmission characteristics of the power transmission system accurately,and provide theoretical support for the magnetic resonant coupling system.


[1] 李长生,张合.引信无线供能系统电磁耦合结构外围金属介质涡流损耗分析[J].南京理工大学学报,2011,35(3):347-351.
Li Changsheng,Zhang He.Eddy current loss analysis of exterior metal dielectric for electromagnetic coupling structure in fuze wireless power supply system[J].Journal of Nanjing University of Science and Technology,2011,35(3):347-351.
[2]Takehiro Imura,Hiroyuki Okabe,Yoichi Hori.Basic experimental study on helical antennas of wireless power transfer for electric vehicles by using magnetic resonant couplings[A].Proceedings of the Vehicle Power and Propulsion IEEE Conference[C].Washington D C:IEEE,2009:936-940.
[3]Hong J S.Couplings of asynchronously tuned coupled microwave resonators[J].Microwaves,Antennas and Propagation IEE Proceedings,1987,35(12):354-358.
[4]Kurs A,Karalis A,Moffatt R,et al.Wireless power transfer via strongly coupled magnetic resonances[J].Science,2007,317:83-86.
[5]Karalis A,Joannopoulos J D,Soljacic M.Efficient wireless non-radiative mid-range energy transfer[J].Annals of Physics,2008,323:34-48.
[6]Hamam R E,Karalis A,Joannopoulos J D,et al.Efficient weakly-radiative wireless energy transfer:An EIT-like approach[J].Annals of Physics,2009,324(8):1783-1795.
[7]Sample A P,Meyer D A,Smith J R.Analysis,experimental results,and range adaptation of magnetically coupled resonators for wireless power transfer[J].IEEE Transcations on Industrial Ectronics,2011,58(2):544-554.
Li Changsheng,Zhang He.Research on wireless power and information synchronous transmission method based on magnetic resonance for fuzes[J].Acta Armamentarii,2011,32(5):537-542.


Last Update: 2014-02-28