Adaptive inductive power supply

  • US 7,639,514 B2
  • Filed: 03/12/2007
  • Issued: 12/29/2009
  • Est. Priority Date: 06/21/1999
  • Status: Expired due to Term
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First Claim
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1. A method of operating a contactless power supply to power a load, the contactless power supply having a tank circuit on a primary side, the tank circuit having a resonant frequency, the tank circuit also having an operating parameter, the tank circuit being inductively coupled to the load on the secondary side, wherein the tank circuit is coupled to an AC power source, the AC power source having an AC power source frequency and a duty cycle, where the AC power source is coupled to a DC power source having a rail voltage, the method comprising:

  • changing the resonant frequency of the tank circuit on the primary side in response to changes of the operating parameter in the tank circuit on the primary side; and

    changing, on the primary side, at least one of the AC power source frequency, the AC power source duty cycle, and the DC power rail voltage in response to changes of the operating parameter in the tank circuit on the primary side.

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