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Resonant wireless charging system and method for electric toothbrush

  • US 10,523,036 B2
  • Filed: 12/14/2016
  • Issued: 12/31/2019
  • Est. Priority Date: 12/14/2016
  • Status: Active Grant
First Claim
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1. A system for charging one or more electric devices, the system comprising:

  • a charging station comprising;

    an input node configured to receive a power input;

    a boost converter coupled to the input node and configured to step up the power input to a boosted voltage level;

    a sensing circuit coupled to the boost converter and configured to detect an electronic device at a receiver side after the power input has been stepped up by the boost converter;

    a power amplifier coupled to the sensing circuit, and a switch coupled to the power amplifier to turn on and off the power amplifier intermittently to allow a detection of the electronic device at the receiver side, wherein the boost converter is configured to provide a range of DC voltage to the power amplifier, and the electronic device is detected by the sensing circuit; and

    a transmitter resonant circuit coupled to the power amplifier and including a transmitter coupling coil configured to oscillate at a resonant frequency; and

    the one or more electric devices to be placed at the receiver side, comprising;

    a receiver resonant circuit including a receiver coupling coil configured to be wirelessly coupled to the transmitter coupling coil; and

    a DC voltage charger configured to charge one or more batteries in the electric device.

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