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Methods and devices for controlling wireless power transfer levels

  • US 10,424,968 B2
  • Filed: 04/25/2017
  • Issued: 09/24/2019
  • Est. Priority Date: 12/23/2014
  • Status: Active Grant
First Claim
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1. A device, comprising:

  • a coil defining a coil axis;

    a tank capacitor electrically coupled to the coil and wherein the coil and the tank capacitor define a resonant frequency;

    a rectifier coupled to the coil so as to receive and rectify an electrical voltage induced in the coil;

    four switching capacitors electrically coupled to the tank capacitor, wherein two switching capacitors are configured to tune the device when heat increases due to high induced current, one switching capacitor is configured to tune the device, and one switching capacitor is configured to compensate any decreasing secondary capacitance of the tank capacitor; and

    a microcontroller electrically coupled to the four switching capacitors so as to tune or detune the resonant frequency established by the coil, the tank capacitor, and the four switching capacitors.

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