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Coil unit, power transmission device, external power feeding apparatus, and vehicle charging system

  • US 9,124,126 B2
  • Filed: 03/11/2011
  • Issued: 09/01/2015
  • Est. Priority Date: 03/11/2011
  • Status: Expired due to Fees
First Claim
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1. A coil unit comprising:

  • a resonant coil establishing an electromagnetic field resonant coupling with an externally provided external resonant coil,said resonant coil including an outer side coil extending along a circumference of a first winding center and centered at about said first winding center, and an extension extending from said outer side coil into a region surrounded by said outer side coil,said resonant coil, which is formed such that an anti-node of the resonant coil that is an area of an anti-node of AC current flowing through said resonant coil, is located at said extension when the electromagnetic field resonant coupling is established between said external resonant coil and said resonant coil.

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