Foreign object detection in wireless energy transfer systems

  • US 10,371,848 B2
  • Filed: 07/03/2018
  • Issued: 08/06/2019
  • Est. Priority Date: 05/07/2014
  • Status: Active Grant
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First Claim
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1. An apparatus for detecting foreign object debris around a wireless power transfer system, the apparatus comprising:

  • a plurality of detectors, each detector comprising one or more loops of conducting material and positioned so that each detector receives at least a portion of a common oscillating magnetic field generated by the wireless power transfer system; and

    a controller configured to measure at least one of a voltage and a current in each detector and to determine, based on the measurements, whether foreign object debris is present around the wireless power transfer system,wherein at least some of the plurality of detectors comprise a first number of loops of the conducting material, and at least some of the plurality of detectors comprise a second number of loops of the conducting material larger than the first number.

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