Title :
A new synchronous rectifier using bipolar transistor driven by current transformer
Author :
Sakai, Eiji ; Harada, Koosuke
Author_Institution :
Dept. of Electron., Kyushu Univ., Fukuoka, Japan
Abstract :
A new synchronous rectifier (SR) unit is proposed. SR has low offset voltage, which improves the efficiency oflow-voltage power supplies. The SR consists of a bipolar junction transistor (BJT) with a low on-resistance and a current transformer (CT). It is turned on by the free-wheeling current due to positive feedback through the CT. This unit needs no extra drive-circuit for BJT. Analysis and practical design considerations for the SR are presented. The lower offset voltage and higher conversion efficiency are obtained experimentally, and the proposed SR is compared with the case of Schottky diode for a 2 V power supply
Keywords :
bipolar transistors; current transformers; power supplies to apparatus; rectifying circuits; 2 V; Schottky diode; bipolar transistor; current transformer; efficiency; free-wheeling current; low offset voltage; low on-resistance; low-voltage power supplies; positive feedback; synchronous rectifier; Bipolar transistors; Circuit faults; Circuit topology; Current transformers; Delay effects; Logic devices; Low voltage; Power supplies; Rectifiers; Strontium;
Conference_Titel :
Telecommunications Energy Conference, 1992. INTELEC '92., 14th International
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-0779-8
DOI :
10.1109/INTLEC.1992.268408
