Volume 44 Issue 3
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LI Xinheng, GONG Lijiao, FENG Li, SUN Xiangyu, LI Yang, LI Hui. Analysis of frequency characteristics of three-coil magnetic coupling resonant wireless power transmission system[J]. Journal of Mine Automation, 2018, 44(3): 91-96. DOI: 10.13272/j.issn.1671-251x.2017090019
Citation: LI Xinheng, GONG Lijiao, FENG Li, SUN Xiangyu, LI Yang, LI Hui. Analysis of frequency characteristics of three-coil magnetic coupling resonant wireless power transmission system[J]. Journal of Mine Automation, 2018, 44(3): 91-96. DOI: 10.13272/j.issn.1671-251x.2017090019
shu

Analysis of frequency characteristics of three-coil magnetic coupling resonant wireless power transmission system

  • 1.

    College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832003, China

  • 2.

    State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, China

  • 3.

    Yingkou Power Supply Company, State Grid Liaoning Electric Power Supply Co., Ltd., Yingkou 115000, China

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  • An equivalent circuit model of three-coil magnetic coupling resonant wireless power transmission system was built, and formulas of system transmission power and transmission efficiency were deduced. Coupling factors relation with the maximum system transmission power was obtained under critical coupling state, and relationship expression between coupling factor and frequency splitting point was given. Frequency characteristics of the system were analyzed. The theoretical analysis results show that there is frequency splitting phenomenon in the system under overcoupling state with three frequency splitting points; the system only resonates at inherent resonant frequency under critical coupling state and undercoupling state; whether there is frequency splitting phenomenon or not, the system resonates at inherent resonant frequency, and transmission power of the system reaches the maximum. The simulation and experimental results verify correctness of the theoretical analysis.
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