Simulation and Experimental Comparison of Different Coupling Mechanisms for the Wireless Electricity Transfer

Wireless electricity transfer is an emerging technology for the future power supply system. In this paper, we simulate two different coupling mechanisms used in the wireless electricity transfer: the inductive coupling and resonant near-field coupling. Equivalent circuits are extracted to simulate their transfer efficiencies. To achieve the maximum transfer efficiency, the optimized frequencies are derived for two mechanisms. There is good agreement between simulation results and measurement results. By comparing their transfer efficiencies, it shows that the resonant near-field coupling is usually more efficient than the inductive coupling for the middle-distance electricity transfer.