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Adjustable resonant apparatus for power converters

  • US 9,484,821 B2
  • Filed: 11/04/2013
  • Issued: 11/01/2016
  • Est. Priority Date: 11/04/2013
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a first series resonant inductor coupled to a switching network and a transformer;

    a first series resonant capacitor coupled to the switching network and the transformer;

    a first parallel inductor coupled to the switching network through the first series resonant inductor and the first series resonant capacitor;

    a resonant frequency adjusting device coupled to the switching network and the transformer; and

    a switch connected in series with the resonant frequency adjusting device, wherein the switch is formed by two back-to-back connected transistors, and wherein the switch has a first terminal directly connected with the resonant frequency adjusting device and a second terminal directly connected with the switching network, and wherein the switch comprises a first transistor and a second transistor that are turned off when a load of the apparatus is greater than a predetermined threshold and turned on when the load of the apparatus is less than the predetermined threshold.

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