• US 20100201316A1
  • Filed: 02/08/2010
  • Published: 08/12/2010
  • Est. Priority Date: 02/09/2009
  • Status: Active Grant
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First Claim
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1. A non-contact power transmission apparatus having an AC power source and a resonance system, the resonance system having 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, wherein 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,wherein 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.

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