Title :
Voltage-driven synchronous rectification in forward topology
Author :
Xie, Xuefei ; Liu, Joe C P ; Poon, Franki N K ; Pong, Bryan M H
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., China
Abstract :
The self-driven synchronous rectification (SDSR) forward topology is widely used in offline low voltage DC-DC power conversion. The major disadvantage of the SDSR forward topology is the conduction of the SR body diode when transformer reset process is over. SR body diode conduction brings excessive loss due to its high forward drop and poor reverse recovery characteristic. In this paper, a new SR drive mechanism is proposed. This drive method effectively prevents the body diode of SR from conduction with a coupled winding and several low power switches. Theoretical analysis and experimental results are shown. A 250 kHz, 48 V input, 5 V/10 A output low profile DC-DC module is designed to verify the proposed idea. 92.3% efficiency is achieved at full load typical line
Keywords :
AC-DC power convertors; DC-DC power convertors; driver circuits; network topology; power semiconductor diodes; power semiconductor switches; power transformers; rectifying circuits; switching circuits; transformer windings; 10 A; 250 kHz; 48 V; 5 V; 92.3 percent; body diode conduction prevention; coupled winding; drive mechanism; forward rectifier topology; low power switches; offline low voltage DC-DC power conversion; transformer reset process; voltage-driven synchronous rectification; Circuit topology; DC-DC power converters; Diodes; Low voltage; MOSFET circuits; Magnetic flux; Network topology; Rectifiers; Strontium; Timing;
Conference_Titel :
Power Electronics and Motion Control Conference, 2000. Proceedings. IPEMC 2000. The Third International
Conference_Location :
Beijing
Print_ISBN :
7-80003-464-X
DOI :
10.1109/IPEMC.2000.885338
