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Wireless power transfer system and a load apparatus in the same wireless power transfer system

  • US 8,531,059 B2
  • Filed: 11/16/2009
  • Issued: 09/10/2013
  • Est. Priority Date: 12/26/2008
  • Status: Active Grant
First Claim
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1. A wireless power transfer system, comprising:

  • a supply-side power supply coil;

    a supply-side magnetic resonance coil;

    a load-side power supply coil; and

    a load-side magnetic resonance coil, wherein said supply-side magnetic resonance coil is excited with electromagnetic induction, by supplying transmission electric powers of frequencies equal to magnetic resonance frequencies of said supply-side magnetic resonance coil and said load-side magnetic resonance coil to said supply-side power supply coil by means of an oscillator, thereby transferring an electric power from said supply-side magnetic resonance coil and said load-side magnetic resonance coil, wirelessly, with applying a magnetic resonance phenomenon between said supply-side magnetic resonance phenomenon between said supply-side magnetic resonance coil and said load-side magnetic resonance coil, so as to output the transmission electric power transferred to said load-side magnetic resonance coil by said load-side power supply coil with the electromagnetic induction, and whereina distance between said supply-side magnetic resonance coil and said load-side power supply coil is shorter than a distance between said supply-side magnetic resonance coil and said load-side magnetic resonance coil, and is longer than a distance between said load-side power supply coil and said load-side magnetic resonance coil.

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