Foreign object detection in wireless energy transfer systems

  • US 10,211,681 B2
  • Filed: 10/07/2016
  • Issued: 02/19/2019
  • 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 at least one of the power source and the auxiliary coil to generate a magnetic field at a position of the detector;

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

    determine whether debris is positioned in proximity to at least one of the power source and the power receiver by comparing baseline information to the measured electrical signal,wherein the baseline information comprises information about an electrical signal generated by the detector when no debris is positioned in proximity to the power source and the power receiver; and

    wherein the control electronics are configured to compare the baseline information to the measured signal by determining mean and covariance matrices for the baseline information and determining whether debris is positioned in proximity to at least one of the power source and the power receiver based on the mean and covariance matrices.

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