Foreign object detection in wireless energy transfer systems

  • US 9,465,064 B2
  • Filed: 10/21/2013
  • Issued: 10/11/2016
  • Est. Priority Date: 10/19/2012
  • Status: Active Grant
  • ×
    • Pin Icon | RPX Insight
    • Pin
First Claim
Patent Images

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 first detector comprising one or more loops of conductive material, wherein the first detector is configured to generate an electrical signal based on a magnetic field between the power source and the power receiver;

    a second detector comprising conductive material; and

    control electronics coupled to the first and second detectors, wherein during operation of the system, the control electronics are configured to;

    measure the electrical signal of the first detector;

    compare the measured electrical signal of the first detector to baseline electrical information for the first detector to determine information about whether debris is positioned between the power source and the power receiver;

    measure an electrical signal of the second detector, wherein the electrical signal of the second detector is related to a capacitance of the second detector; and

    compare the measured electrical signal of the second detector to baseline electrical information for the second detector to determine information about whether a living object is positioned between the power source and the power receiver.

View all claims
  • 1 Assignment