Foreign object detection in wireless energy transfer systems

  • US 10,018,744 B2
  • Filed: 05/07/2015
  • Issued: 07/10/2018
  • Est. Priority Date: 05/07/2014
  • Status: Active Grant
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First Claim
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1. A wireless power transfer system comprising:

  • a wireless power transfer source configured to generate a source magnetic field at a first frequency to transfer power to a wireless power receiver;

    an auxiliary magnetic field source configured to generate an auxiliary magnetic field at a second frequency;

    at least one detector configured to generate an electrical signal in response to perturbations in the auxiliary magnetic field generated by the auxiliary magnetic field source; and

    a controller configured to determine whether foreign object debris is present around the wireless power transfer system based on the electrical signal.

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