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Systems and methods for inductively coupled power transfer and bidirectional communication

  • US 10,256,676 B2
  • Filed: 07/29/2016
  • Issued: 04/09/2019
  • Est. Priority Date: 07/31/2015
  • Status: Active Grant
First Claim
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1. A method of wireless power transfer, comprising:

  • providing a primary rail voltage to a primary coil via a primary transistor network;

    driving the primary transistor network with a primary pulse-width modulation (PWM) signal;

    inducing a secondary current on a secondary coil;

    providing a secondary rail voltage to a load via a secondary transistor network;

    generating a voltage signal from the secondary current via a current sense amplifier;

    phase-locking the voltage signal to the secondary current;

    adjusting a phase shift and amplitude of the voltage signal based on the impedance of the load, thereby generating a driving voltage;

    converting the driving voltage to a secondary PWM signal; and

    driving the secondary transistor network with the PWM signal, wherein a barrier is disposed between the primary coil and the secondary coil, and wherein the primary coil generates a primary flux in the barrier and the secondary coil is driven by the secondary rail voltage to generate a secondary flux in the barrier that cancels out at least a portion of the primary flux.

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