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Apparatus and method for detecting foreign objects in wireless power transmission system

  • US 10,439,445 B2
  • Filed: 09/11/2017
  • Issued: 10/08/2019
  • Est. Priority Date: 07/10/2012
  • Status: Active Grant
First Claim
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1. A wireless power reception apparatus, comprising:

  • a secondary coil configured to receive a wireless power from a primary coil included in a wireless power transmission apparatus; and

    a power measurement circuit configured to send, to the wireless power transmission apparatus, power information indicative of an amount of power requested by the wireless power reception apparatus,wherein the power measurement circuit of the wireless power reception apparatus is further configured to;

    measure one or more measured power values indicative of an amount of power received from the wireless power transmission apparatus after sending the power information indicative of the amount of power requested;

    determine that a foreign object has been detected based on a comparison of the amount of power requested and the one or more measured power values; and

    inform the wireless power transmission apparatus to stop or suspend the transmission of wireless power in response to determining that the foreign object has been detected.

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