POWER TRANSMITTING DEVICE, POWER RECEIVING DEVICE, POWER SUPPLY SYSTEM, AND ELECTRONIC DEVICE

摘要

The invention addresses the problem of providing, in wireless power supply, a power supply system capable of maintaining a relatively high power transmission efficiency even when a power transmission distance is long. A power transmitting coil unit (210) has a plurality of resonance coils (221) arranged so as to form a periodical structure. The resonance coils (221) form a transmission line for an electromagnetic wave, and a standing wave of an electromagnetic propagating wave occurs in the power transmitting coil unit (210). Similarly, a power receiving coil unit (310) has a plurality of resonance coils (321) arranged so as to form a periodical structure. The power transmission efficiency is maintained relatively high even if the distance between a power transmitting device (200) and a power receiving device (300) exceeds twice.