Wireless energy transfer for mobile device applications

  • US 9,917,479 B2
  • Filed: 04/16/2015
  • Issued: 03/13/2018
  • Est. Priority Date: 04/16/2014
  • Status: Active Grant
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First Claim
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1. A wireless power source comprising:

  • a printed circuit board, wherein the printed circuit board includes at least a first layer, a second layer, and a third layer;

    a current sensor created on the printed circuit board, the current sensor comprisinga loop of conductive material, wherein the loop of conductive material includes a diameter D3 on the second layer, anda coil of conductive material, wherein the coil of conductive material has at least two turns, wherein the coil of conductive material occupies the first layer and the third layer with an outer diameter D1 and an inner diameter D2, connected through each of the first, second, and third layers, such that the at least two turns of the coil of conductive material wrap around the loop of conductive material, and wherein the loop of conductive material is coupled to the coil of conductive material;

    a conductor routed through the inner diameter D2 of the coil of conductive material; and

    circuitry coupled with the current sensor, the circuitry being configured to use the current sensor to measure one or more values of current flowing through the conductor;

    wherein the circuitry comprises circuitry configured to remove harmonic content from a signal received from the current sensor, a differential amplifier with a voltage output, and peak detector circuitry including an operational amplifier to track a peak of the voltage output and determine a measured current value of the conductor.

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