Non-contact power transmission apparatus

摘要

A non-contact power transmission apparatus having an AC power source and a resonance system is disclosed. The resonance system has a primary coil connected to the AC power source, a primary side resonance coil, a secondary side resonance coil, a secondary coil, and a load connected to the secondary coil. The primary side resonance coil is separated from the primary coil in an axial direction by a first distance, and the secondary coil is separated from the secondary side resonance coil in the axial direction by a second distance. At least one of the first distance and the second distance is adjusted to be a distance that is determined in advance in accordance with the impedance of the load so that the power transmission efficiency is maintained at a proper value.