Wireless power transfer via electric field resonance coupling

Wireless power transfer systems using electric fields have been investigated mainly for power transfer over extremely close regions. Using an electromagnetic field simulator, we have made a prototype of an LC series type resonance coupler made from a coil and electrode. When the distance between the transmission and reception couplers was varied, it was found that a transfer efficiency of 90% or more was achieved at a distance of 180 mm. Also a large power transfer test was carried out in which it was found that it was possible to transfer 838 W of power.