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Inductive power supply with duty cycle control

  • US 10,170,935 B2
  • Filed: 01/20/2016
  • Issued: 01/01/2019
  • Est. Priority Date: 01/07/2008
  • Status: Active Grant
First Claim
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1. An inductive power supply for providing power wirelessly to a remote device, said inductive power supply comprising:

  • a primary circuit for controlling power transfer to the remote device according to at least one operating parameter, said primary circuit configured to adjust a duty cycle of a signal to allow variation in an amount of power transferred to the remote device;

    a wireless receiver configured to receive information communicated from the remote device;

    a sensor configured to sense a characteristic of power in the inductive power supply;

    a tank circuit in electrical communication with said primary circuit, said tank circuit configured to inductively couple with the remote device;

    wherein said primary circuit controls, based on sensor output from said sensor, said at least one operating parameter to achieve a desired operating point; and

    wherein said primary circuit controls said duty cycle of said signal to maintain an amount of power transferred despite variations in operating conditions that affect resonant frequency.

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