Patent ID: 6917529
Filing Date: 2005-07-12
Classification: H02M,Y02B

Abstract:
1. A DC-to-DC power converter comprising: a transformer having a primary winding and at least first and second secondary windings; an input circuit coupled to said primary winding and adapted to apply an alternating polarity square wave voltage to said primary winding; an output circuit comprising an output filter coupled to a tap of said first secondary winding, said output filter providing a DC output voltage, a first synchronous rectifier coupled to a first end of said first secondary winding and a second synchronous rectifier coupled to a second end of said first secondary winding, said second secondary winding having a first end coupled to a control terminal of said first synchronous rectifier and a second end coupled to a control terminal of said second synchronous rectifier; a first snubber circuit coupled between said control terminal of said first synchronous rectifier and said second end of said first secondary winding; and a second snubber circuit coupled between said control terminal of said second synchronous rectifier and said first end of said first secondary winding; wherein, said first and second snubber circuits provide faster transition of said first and second synchronous rectifiers, respectively, between on and off states.