Title :
Zero-voltage-switched push-pull DC-DC converter
Author :
Shoyama, Masahito ; Harada, Koosuke
Author_Institution :
Dept. of Electron., Kyushu Univ., Fukuoka, Japan
Abstract :
A novel zero-voltage-switched (ZVS) push-pull DC-DC converter with two synchronous rectifiers in the secondary circuit is presented. ZVS is realized using the magnetizing current of the transformer as a current source during the commutation. The output circuit is isolated and the output voltage is controlled by pulsewidth modulation (PWM) with a constant frequency. The synchronous rectifier is employed to get a low forward voltage drop in the rectification. The abnormal increase of the output voltage in the low output current region which is caused by the interaction between the magnetizing current of the transformer and the output inductor current is eliminated. The circuit operation is analyzed in detail and confirmed experimentally
Keywords :
power convertors; pulse width modulation; PWM; commutation; current source; magnetizing current; output inductor current; pulsewidth modulation; push-pull DC-DC converter; secondary circuit; synchronous rectifiers; transformer; zero-voltage-switched; DC-DC power converters; Frequency; Low voltage; Pulse circuits; Pulse transformers; Pulse width modulation; Rectifiers; Space vector pulse width modulation; Voltage control; Zero voltage switching;
Conference_Titel :
Power Electronics Specialists Conference, 1991. PESC '91 Record., 22nd Annual IEEE
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-0090-4
DOI :
10.1109/PESC.1991.162680
