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Inductively coupled ballast circuit

  • US 8,618,749 B2
  • Filed: 09/15/2011
  • Issued: 12/31/2013
  • Est. Priority Date: 06/21/1999
  • Status: Expired due to Fees
First Claim
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1. A wireless power supply for supplying wireless power to an electronic component, the electronic component being absent from physical interconnection with the wireless power supply and absent from electrical connection with the wireless power supply, the wireless power supply and the electronic component being separable and capable of inductively coupling when in sufficient proximity to each other, the wireless power supply comprising:

  • a resonant tank circuit configured to generate a varying magnetic field in response to an AC current;

    an analog control circuit in electrical communication with the resonant tank circuit, the analog control circuit configured to adjust the frequency of the AC current supplied to the resonant tank circuit;

    a digital control unit having an output in electrical communication with the resonant tank circuit, said digital control unit configured to monitor and control the varying magnetic field generated by the resonant tank circuit; and

    a ballast feedback circuit electrically connected to the resonant tank circuit and the digital control unit, the ballast feedback circuit configured to provide feedback to the digital control unit indicative of the energy provided by the resonant tank circuit to the electronic component during operation for monitoring the varying magnetic field generated by the resonant tank circuit.

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