Title :
Design considerations of a self-biased current driven SR in DCM flyback DC/DC converter
Author :
Shao, Shuai ; Wu, Xinke ; Chen, Min ; Peng, F.Z.
Author_Institution :
Coll. of Electr. Eng., Zhejiang Univ., Hangzhou, China
Abstract :
In this paper, different kinds of driving methods for synchronous rectifier (SR) are compared, and a self-biased current driven circuit for SR is proposed. The circuit uses a current transformer (CT) to generate driving signal, as well as provide the driving power. With a capacitor to produce bias voltage, this circuit can be used without considering the location of SR and the output voltage of converter. Furthermore, a speed-up capacitor is added to fasten the turn-on speed, thus high frequency application is possible. Experiments based on a 120W flyback prototype have been done to verify the theoretical analysis. The efficiency of the prototype is improved by 2% with proposed SR driving method, compared with Schottky diode rectifier at full load.
Keywords :
DC-DC power convertors; capacitors; current transformers; rectifiers; DCM flyback DC/DC converter; bias voltage; current driven circuit; current transformer; self-biased current driven; speed-up capacitor; synchronous rectifier; Capacitors; Converters; Inductance; Logic gates; Schottky diodes; Strontium; Transistors; DC-DC converter; current driven synchronous rectifier; flyback; self-biased;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2010 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-5286-6
Electronic_ISBN :
978-1-4244-5287-3
DOI :
10.1109/ECCE.2010.5618036
