Satoshi Hyodo

Equivalent circuit of wireless power transmission with coil array structures

Wireless power transfer system with coil arrays which can supply to several apparatus at the same time is expected. In this case, only one or two primary coils under the secondary coil are excited. The electromotive force of the secondary coil is changed by the interval of primary coils and the number of the excited coils. In this paper, the effective equivalent circuit which could reproduce this behavior is presented.

Resonance type short distance power transfer property for the structure parameter of the spiral coil

Recently wireless power transmission technology attracts attention. A method using magnetic resonant wireless power driven by about 10MHz, examination such as improvement of the transmission efficiency or the extension of the transmission distance is researched. On the other hand, we are interested in possibility of the reduction of the thickness of the antenna coil. In addition, we are studying high efficiency power transmission at short distance to reduce leakage magnetic flux. We investigated the structure parameter of the spiral type coil antenna that the transmission of the high efficiency could be possible in case of short distance. The control possibility of the transmission distance by the adjustment of this structure parameter was derived.