Patent ID: 6570268
Filing Date: 2003-05-27
Classification: H02M,Y02B

Abstract:
A dual output power converter, comprising:a transformer having first and second secondary windings; a first synchronous rectifier coupled to the first secondary winding of the transformer for converting a first alternating voltage at the first secondary winding to a first DC output voltage; a second synchronous rectifier coupled to the second secondary winding of the transformer for converting a second alternating voltage at the second secondary winding to a second DC output voltage; and a drive circuit coupled to each of the first and second synchronous rectifiers for turning on the first and second synchronous rectifiers when the first alternating voltage at the first secondary winding and the second alternating voltage at the second secondary winding transition from a first polarity to a second polarity, and for turning off the first and second synchronous rectifiers when the first alternating voltage at the first secondary winding and the second alternating voltage at the second secondary winding transition from the second polarity to the first polarity, wherein the drive circuit includes a first switch coupled to the first and second synchronous rectifiers and a second switch coupled to at least one of the first and second synchronous rectifiers.