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Wireless inductive power transfer

  • US 10,523,052 B2
  • Filed: 09/14/2015
  • Issued: 12/31/2019
  • Est. Priority Date: 09/16/2014
  • Status: Active Grant
First Claim
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1. A power transmitter for wirelessly providing power to a power receiver via an inductive power signal, the power transmitter comprising:

  • a resonance circuit configured to generate the inductive power signal, the resonance circuit comprising a capacitive impedance and an inductive impedance;

    a driver for generating a drive signal for the resonance circuit, the drive signal having an operating frequency and being configured to generate a timing signal to have transitions corresponding to a change in a signal parameter of the timing signal, the transitions being synchronized to the drive signal; and

    a frequency modification circuit configured to control a resonance frequency of the resonance circuit by slowing a state change for at least one of the capacitive impedance and the inductive impedance for a fractional time interval of each of at least a plurality of cycles of the drive signal, the frequency modification circuit being configured to align one of a start time and an end time for the fractional time interval to at least some of the transitions of the timing signal, and to control another of the start time and the end time to have a fixed time offset relative to a time instant of a signal of at least one of the capacitive impedance and the inductive impedance crossing a threshold.

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