| Recent years magnetic resonance coupling wireless power transfer(MRC/WPT)has received more and more attention and research at home and abroad due to possessing many advantages,such as middle transmission distance,high efficiency,good direction,strong anti-interference capacity and non-radiation.magnetic resonance coupling wireless power transfer based on the basic resonance coupling between two inductance coils to realize efficient exchange energy.However,existing researches have shown that a frequency splitting phenomenon will occur when resonant coils comes too close,reduces the transfer efficiency.For suppress frequency splitting phenomenon,this paper focuses on the structure of the transmitter and receiver,a method changing the structure of the transmitter and receiver is proposed to eliminate over-coupling phenomenon,and hence frequency splitting can be suppressed and stable and efficient transfer characteristics can be achieved.Firstly,this paper analyzes the coupled mode theory,circuit theory and scattering matrix theory of wireless power transfer via coupled magnetic resonance.The results show that scattering matrix theory is suited for the occasion where the source impedance and load impedance matching,and also helps to optimize the parameters design of resonators.Secondly,a theoretical model of wireless power transfer with normal,forward and reverse series and forward parallel transmitting coils is set up,the influence of variation of coupled coefficient on wireless power transfer is analyzed.The calculations provides the parameters of the transmitting coil,and the model is validated by simulation results.Finally,the experimental setup of wireless power transfer is established.And more,the performance of wireless power transfer with three different kinds of transmitting coil is tested,and experimental results verify the system presented. |
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