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Non-contact charging method

  • US 9,490,654 B2
  • Filed: 11/26/2012
  • Issued: 11/08/2016
  • Est. Priority Date: 01/17/2012
  • Status: Active Grant
First Claim
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1. A non-contact charging method in which a battery-equipped device is set in a charging stand, and a power reception coil of the battery-equipped device is electromagnetically coupled to a power transmission coil of the charging stand and power is transmitted from the power transmission coil to the power reception coil by an electromagnetic induction action, and a battery of the battery-equipped device is charged by the power induced to the power reception coil, the method comprising:

  • supplying a plurality of pulse powers having different powers to the power transmission coil by the charging stand at a predetermined time interval;

    detecting currents of the power transmission coil in states of supplying the plurality of pulse powers having different powers by the charging stand; and

    determining whether or not a foreign object is set on the charging stand based on differences of the detected current values corresponding to the plurality of pulse powers having different powers by the charging stand.

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