Foreign object detection in wireless energy transfer systems

  • US 10,063,110 B2
  • Filed: 10/19/2016
  • Issued: 08/28/2018
  • Est. Priority Date: 10/19/2015
  • Status: Active Grant
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First Claim
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1. A wireless energy transfer system, comprising:

  • a source resonator configured to generate an oscillating magnetic field to transfer energy to a receiver resonator;

    a plurality of sensors, wherein each of the sensors is configured to generate an electrical signal in response to a magnetic field; and

    a controller coupled to each of the sensors,wherein during operation of the system, the controller is configured to;

    obtain a system calibration state comprising a set of basis vectors derived from a first set of electrical signals generated by the plurality of sensors with no foreign object debris in proximity to the system;

    measure a second set of electrical signals generated by the plurality of sensors;

    calculate a projection of the second set of electrical signals onto the set of basis vectors;

    calculate a detection signal based on the projection of the second set of electrical signals;

    determine whether foreign object debris is present in proximity to the system by comparing the calculated detection signal to a detection threshold value; and

    adjust the system calibration state based on the presence or absence of foreign object debris in proximity to the system to generate an updated system calibration state.

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