Patent ID: 6188592
Filing Date: 2001-02-13
Classification: H02M,Y02B

Abstract:
An externally-driven synchronous rectifier circuit for a DC to DC power converter comprising:a primary transformer having a primary and secondary winding, said secondary winding having a first terminal and a second terminal;a first synchronous rectifier operably coupled to said second terminal of said primary transformer;a second synchronous rectifier operably coupled to said first terminal of said primary transformer;an external drive circuit operably coupled to said primary winding of said primary transformer, said external drive circuit further comprising a timing circuit and a timing transformer, said timing transformer having a first end and a second end;a first driving circuit operably coupled to said second synchronous rectifier, said first driving circuit further comprising a first switch and a second switch comprising MOSFETs having gates, wherein said gate of said first switch is connected to said first end of said timing transformer, and wherein said gate of said second switch is connected to said first end of said primary transformer; anda second driving circuit operably coupled to said first synchronous rectifier, said second driving circuit further comprising a third switch and a fourth switch comprising MOSFETS having gates, wherein said gate of said third switch is connect to said second end of said timing transformer, and wherein said gate of said fourth switch is connected to said second end of said primary transformer.