Foreign object detection in wireless energy transfer systems

  • US 10,686,337 B2
  • Filed: 02/15/2019
  • Issued: 06/16/2020
  • Est. Priority Date: 10/19/2012
  • Status: Active Grant
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First Claim
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1. A wireless power transfer system, comprising:

  • an auxiliary coil positioned in proximity to at least one of a power source and a power receiver;

    a detector positioned in proximity to at least one of the power source and the power receiver, wherein the detector is configured to generate an electrical signal in response to a change in a magnetic field; and

    control electronics coupled to the auxiliary coil and to the detector, wherein the control electronics are configured to;

    activate the auxiliary coil to generate a magnetic field at a position of the detector;

    measure an electrical signal generated by the detector in response to the magnetic field generated by the auxiliary coil; and

    determine whether debris is positioned in proximity to the at least one of the power source and the power receiver based on the measured electrical signal.

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