Analysis of Distance Characteristics of Magnetically-Coupled Resonant Wireless Power Transfer System
In a magnetically coupled resonance system,changes in the distance between adjacent coils can affect transmission performance.In order to explore the influence of distance on the transfer performance,a four-coil magnetically-coupled resonant wireless power transfer system is established.Based on the mutual inductance coupling theory,the relationship between the transfer power and efficiency and coupling coefficient is obtained.Supported by the simulation analysis and experimental evidences,it finds that the coupling coefficient k23(be-tween transmitter and receiver coils)is the most significant factor affecting the transfer efficiency.Under the op-timal 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 k12,k23 and k34 is deduced,which can make a con-tribution to the optimization of parameters and improvement of transfer efficiency for the wireless power transfer system.
wireless power transfermagnetically-coupled resonancecoupling coefficient
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