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Variable reactive element in a resonant converter circuit

  • US 8,050,068 B2
  • Filed: 05/21/2004
  • Issued: 11/01/2011
  • Est. Priority Date: 05/23/2003
  • Status: Active Grant
First Claim
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1. A resonant converter including an input for connection to a substantially direct current electrical supply, a resonant circuit, first switching apparatus to selectively provide current from the input to the resonant circuit, second switching apparatus associated with a reactive element of the resonant circuit, a switch controller operable to control the second switching apparatus to vary the effective reactance of the reactive element, and a phase sensor to sense the phase of a voltage or current in the resonant circuit whereby the controller may actuate the second switching apparatus to allow the reactive element to be electrically connected to or disconnected from the resonant circuit a predetermined time period after the phase sensor senses a voltage zero crossing to vary the effective reactance of the reactive element and thereby vary the resonant frequency of the resonant circuit.

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