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CONTACTLESS POWER SUPPLY DEVICE AND CONTACTLESS CHARGING SYSTEM

  • US 20120313579A1
  • Filed: 03/07/2011
  • Published: 12/13/2012
  • Est. Priority Date: 03/26/2010
  • Status: Abandoned Application
First Claim
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1. A contactless power supply device that supplies power in a contactless manner from a primary coil to a secondary coil, the contactless power supply device comprising:

  • the primary coil supplied with AC current l to generate alternating flux;

    an input current measurement unit that measures a current value of an input current of the primary coil in a charging state during which the alternating flux generated by the primary coil intersects the secondary coil; and

    a determination unit that determines that a metal foreign object has been detected when a most recent input current measured by the input current measurement unit in a most recent detection cycle is greater than or equal to a threshold obtained by adding a predetermined current value to a reference current value, which corresponds to a current value of an input current measured by the input current measurement unit in a previous detection cycle.

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