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Dynamic sharing average current mode control for active-reset and self-driven synchronous rectification for power converters

  • US 9,780,635 B1
  • Filed: 06/10/2016
  • Issued: 10/03/2017
  • Est. Priority Date: 06/10/2016
  • Status: Active Grant
First Claim
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1. An average current mode control (ACMC) controller for a power converter, the power converter comprising a power transformer having a primary winding electrically coupleable to an input voltage node and a secondary winding electrically coupleable to an output voltage node, a primary control circuit electrically coupled to the primary winding, a secondary control circuit electrically coupled to the secondary winding, the secondary control circuit comprising first and second synchronous rectifying elements comprising respective first and second control nodes, the average current mode control (ACMC) controller comprising:

  • a magnetic communicator circuit comprising;

    a selectively controllable switch; and

    a coupling transformer comprising a first primary winding, a second primary winding, and a secondary winding, the secondary winding electrically coupled to a secondary side DC voltage supply circuit comprising a DC supply rectifier and a DC supply capacitor which provides a secondary side DC voltage supply on the DC supply capacitor of the secondary side DC voltage supply circuit, the first and second primary windings selectively coupled to a primary side DC voltage supply via the controllable switch whereby the secondary side DC voltage supply is developed on the DC supply capacitor of the secondary side DC voltage supply circuit by selectively controlling the controllable switch into conduction, the secondary winding electrically coupled to a secondary side feedback signal node, and the second primary winding electrically coupled to a sampling circuit comprising a sampling rectifier and a sampling capacitor whereby a secondary side feedback signal at the secondary side feedback signal node is transferred to the second primary winding by the selective controlling of the controllable switch into conduction, whereby a primary side feedback voltage is developed on the sampling capacitor of the sampling circuit by the selective controlling of the controllable switch into conduction, the primary side feedback voltage electrically coupleable to the primary control circuit of the power converter.

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