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- 저자 : Lijiao Gong (검색결과 2 건)
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Lijiao Gong,Xinheng Li,Xuewei Chao,Jing Zuo,Yang Li 한국자기학회 2017 Journal of Magnetics Vol.22 No.3
As known, the variation of distances between the adjacent coils will affect the transfer efficiency in magnetic coupled resonance system. In order to explore the influence of distance on the optimum transfer efficiency, a four-coil magnetic coupled resonance system is established. Based on the mutual inductance coupling theory, the relationship between the transfer efficiency and coupling coefficient is obtained. Supported by the simulation analysis and experimental evidences, it is found that the coupling coefficient k23 (between transmitter and receiver coils) is the most significant factor affecting the transfer efficiency. Under the optimal k23, the transfer efficiency will increase with the coupling coefficient k12 (between driver and transmitter coils). Besides, it will firstly increase and then decrease with the coupling coefficient k34 (between receiver and load coils). Moreover, the theoretical calculation formula of k23 is deduced, which can make a contribution to the optimization of parameters and improvement of transfer efficiency for the four-coil magnetic coupled resonance system.
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Lijiao Gong,Xinheng Li,Xuewei Chao,Yang Li,Hui Li,Hongwei Li 한국자기학회 2017 Journal of Magnetics Vol.22 No.3
The impedance matching problem of magnetic coupled resonant wireless power transfer system based on planar spiral coils is studied in this paper. Taken the coupling factors into account, the relationships between impedance matching, resonant frequency and transfer distance are analyzed. Supported by the simulation analyses and experimental evidences, it is indicated that the optimum matching resistances for transfer power and transfer efficiency are different. In details, the optimal matching resistance for output power decreases with the transfer distance, while that for the transfer efficiency does not vary with transfer distance. Thus, this research provides a valuable reference for the further research on adaptive impedance matching of magnetic coupled resonant wireless power transfer system.
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