In this paper, the electric field resonance (EFR) method, similar to the four-coil configuration of the magnetic field resonance wireless power transfer, is proposed for the capacitive coupling power transfer. The characteristics of the proposed method are derived and analyzed. With the EFR method, not only unity power factor for the power source is achieved, also high power factor and low reactive power for the capacitive coupling stage are achieved. Effective power transfer is realized by the EFR method. Based on the proposed method, a dynamic charging concept for railway vehicles is then proposed. A prototype powering system is designed and built to prove the validity of the proposed method. Analytical, simulation and experimental results are given and compared. A 23 cm model vehicle is put on a 150 cm track. It is shown that about 700W power is transferred through a 24 pF coupling capacitor. The proposed method reaches 91% DC-DC overall efficiency at switching frequency 2 MHz.Index Terms-Capacitive power transfer (CPT), electric fielding resonance, dynamic charging. interests include simulation of wireless power transfer and electric-field coupled power transfer.Chunyan Shuai received the B.S. and M.S. degrees in control science engineering and computer application science from Kunming
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