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Contactless power transmission device

  • US 9,555,713 B2
  • Filed: 03/06/2014
  • Issued: 01/31/2017
  • Est. Priority Date: 10/28/2011
  • Status: Active Grant
First Claim
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1. A contactless power transmission device comprising:

  • a power receiver;

    a power feeder configured to contactlessly feed power to the power receiver, the power feeder including a primary coil configured to generate magnetic flux by an input alternating current voltage, and a cover configured to cover the primary coil; and

    a capacitive sensor including an electrode and configured to supply an alternating current voltage to the electrode to measure a capacitance occurring between the electrode and foreign matter present around the cover and thereby detect the foreign matter,whereinthe frequency of the alternating current voltage of the capacitive sensor is set to be higher than the frequency of the magnetic flux generated by the primary coil.

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