Foreign object detection in wireless energy transfer systems

  • US 9,404,954 B2
  • Filed: 10/21/2013
  • Issued: 08/02/2016
  • 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:

  • a power source comprising at least one resonator;

    a power receiver comprising at least one resonator, wherein the power receiver is configured to receive electrical power transmitted wirelessly by the power source;

    a detector positioned between the power source and the power receiver, wherein the detector is configured to generate an electrical signal based on a magnetic field between the power source and the power receiver; and

    control electronics coupled to the power source and detector, wherein the control electronics are configured to;

    activate the power source to generate a magnetic field between the power source and the power receiver;

    measure the electrical signal of the detector; and

    determine whether debris is positioned between 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 between 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 between the power source and the power receiver based on the mean and covariance matrices.

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