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Switching mode power converter having secondary side bias generating and driving circuit to provide synchronous rectification and active clamp

  • US 20060018133A1
  • Filed: 04/29/2005
  • Published: 01/26/2006
  • Est. Priority Date: 04/29/2004
  • Status: Active Grant
First Claim
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1. A switched mode power converter, comprising:

  • a transformer having a primary winding, a secondary winding, and a bias winding;

    a primary side power switch coupled to said primary winding and being adapted to periodically apply an input voltage to said primary winding;

    an output filter operatively coupled to said secondary winding to provide an output voltage and output current;

    a forward synchronous rectification device operatively coupled in series between said secondary winding and said output filter;

    a free-wheeling synchronous rectification device operatively coupled in shunt with said secondary winding and said output filter; and

    a control circuit coupled to said bias winding and said forward and free-wheeling synchronous rectification devices, said control circuit including a forward driving device adapted to couple an activation terminal of said forward synchronous rectification device to a first end of said secondary winding and a free-wheeling driving device adapted to couple an activation terminal of said free-wheeling synchronous rectification device to a second end of said secondary winding, said control circuit activating said forward and free-wheeling driving devices responsive to voltage on said bias winding.

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