Foreign object detection in wireless energy transfer systems

  • US 10,778,047 B2
  • Filed: 07/13/2018
  • Issued: 09/15/2020
  • Est. Priority Date: 09/09/2011
  • Status: Active Grant
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First Claim
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1. A wireless energy transfer system with foreign object debris detection, the system comprising:

  • at least one wireless energy transfer source configured to generate an oscillating magnetic field;

    at least one magnetic field sensor comprising at least two loops of conductive wire through which the oscillating magnetic field passes, wherein a first current induced in a first loop of the magnetic field sensor flows substantially in an opposite direction to a second current flowing in a second loop of the magnetic field sensor;

    at least one readout circuit configured to measure an electrical parameter of the at least one magnetic field sensor to determine a presence of a metallic foreign object.

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