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HALF-BRIDGE LLC RESONANT CONVERTER WITH SELF-DRIVEN SYNCHRONOUS RECTIFIERS

  • US 20090244933A1
  • Filed: 12/30/2008
  • Published: 10/01/2009
  • Est. Priority Date: 04/01/2008
  • Status: Active Grant
First Claim
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1. A half-bridge LLC resonant converter with self-driven synchronous rectifiers, comprising:

  • a first switch transistor and a second switch transistor connected between an external voltage source and a primary ground terminal in a half-bridge configuration, wherein the connection point of said first switch transistor and said second switch transistor is called a first node;

    an LLC resonant tank connected between said first node and said primary ground terminal, wherein said LLC resonant tank comprises a resonant capacitor, a resonant inductor, and a magnetizing inductor, and said magnetizing inductor provided by a primary winding of a power transformer;

    a power loop connecting between a first secondary winding and a second secondary winding of said power transformer, wherein said power loop comprises a first synchronous rectifier transistor, a second synchronous rectifier transistor and a filter capacitor, said first synchronous rectifier transistor and said second synchronous rectifier transistor are connected in a center-tapped common-source rectifier configuration between said first and said second secondary windings of said power transformer and a secondary ground terminal, the other two terminals of said first secondary winding and said second secondary winding are connected to a voltage output terminal, and said capacitor is connected between said voltage output terminal and said secondary ground terminal;

    a primary IC controller; and

    a gate driver connected between said primary IC controller and gates of said first synchronous rectifier transistor and said second synchronous rectifier transistor.

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