Patent ID: 6744649
Filing Date: 2004-06-01
Classification: H02M,Y02B

Abstract:
A soft-switching power converter, comprising:a transformer, having a primary winding and a secondary winding; a primary circuit, coupled to the primary winding, wherein the primary circuit further comprises a pair of main switches and a pair of auxiliary switches, a secondary circuit, coupled to the secondary winding; a feedback circuit, coupled to an output of the secondary circuit to generate a feedback voltage; a controller, coupled to feedback voltage and the primary circuit, the controller being operative to conduct the primary winding to an input voltage source in response to the feedback circuit, wherein the controller is operative to generate a first switching signal and a second switching signal out of phase with each other to drive the main and auxiliary switches, respectively; and a detection diode connected between the main switches and the controller, wherein the detection diode is operative to generate a detection signal output to the controller upon detection of a zero-voltage transition condition of the transformer.