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Wireless Charging System With Metallic Object Detection

  • US 20190326782A1
  • Filed: 07/10/2018
  • Published: 10/24/2019
  • Est. Priority Date: 04/24/2018
  • Status: Active Application
First Claim
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1. A wireless power transmitting device with a charging surface configured to receive a wireless power receiving device that has a wireless power receiving coil, the wireless power transmitting device comprising:

  • a coil;

    wireless power transmitting circuitry coupled to the coil and configured to transmit wireless power signals with the coil;

    impulse response measurement circuitry coupled to the coil; and

    control circuitry configured to;

    control the wireless power transmitting circuitry to supply a first impulse signal at a first maximum power level to the coil;

    measure an impulse response of the coil with the impulse response measurement circuitry;

    detect whether a metal foreign object is present on the charging surface based on the measured impulse response; and

    control the wireless power transmitting circuitry to supply a second impulse signal at a second maximum power level to the coil in response to detecting that the metal foreign object is present on the charging surface, wherein the second maximum power level is different from the first maximum power level.

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