Flyback converter with synchronous rectifier

Details Flyback converter with synchronous rectifier Flyback converter with synchronous rectifier

2006-03-14

2006-03-14

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S021140, C363S021170

Reexamination Certificate

active

07012821

ABSTRACT:
Disclosed herein is a flyback converter with a synchronous rectifier which is applied to a power supply of a portable computer such as a notebook PC. The flyback converter is operated in a critical conduction mode to turn on/off a main switch at a zero crossing point of an output voltage. The flyback converter is also adapted to control the duty cycle of a synchronous switch using a Zener diode. Therefore, there is no need for a Schottky diode to be connected in parallel with the synchronous switch, resulting in simplification in circuit design.

REFERENCES:
patent: 6185114 (2001-02-01), Matsumoto et al.
patent: 6353544 (2002-03-01), Lau
patent: 6442048 (2002-08-01), Sun et al.
patent: 6462965 (2002-10-01), Uesono
patent: 6618274 (2003-09-01), Boylan et al.
patent: 6639813 (2003-10-01), Yamagishi et al.
patent: 6678172 (2004-01-01), Zhang et al.
patent: 6791849 (2004-09-01), Nakayama

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