Active clamp for buck-based converter and method of operation th

Details Active clamp for buck-based converter and method of operation th Active clamp for buck-based converter and method of operation th

1998-04-02

1999-11-02

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 17, H02H 7122

Patent

active

059782382

ABSTRACT:
For use with a buck-based converter having a rectifier that receives current from a secondary side of a isolation transformer, an active clamp and a method of operating the buck-based converter to manage reverse recovery energy therein. In one embodiment, the active clamp includes: (1) an auxiliary transformer coupled across the isolation transformer and (2) an auxiliary switch, interposed between the auxiliary transformer and the rectifier, that: (2a) closes as a function of an output voltage of the rectifier to cause the auxiliary transformer to receive reverse recovery energy from the rectifier and deliver the reverse recovery energy to a primary side of the isolation transformer and (2b) opens to limit a magnetic flux of a core of said auxiliary transformer.

REFERENCES:
patent: 5278748 (1994-01-01), Kitajima
patent: 5590032 (1996-12-01), Bowman et al.
patent: 5615094 (1997-03-01), Cosentino et al.
patent: 5644480 (1997-07-01), Sako et al.
patent: 5726869 (1998-03-01), Yamashita et al.
patent: 5731966 (1998-03-01), Liu
patent: 5736842 (1998-04-01), Javanovic
U.S. Appliction No. 09/036,538 Entitled "Power Converter Having a Low-Loss Clamp and Method of Operation Thereof"; Filed Mar. 6, 1998; inverntor: Loveday H. Mweene.
U.S. Application No. 08/921,995 Entitled "Active Snubber For Buck-Based Converters and Method of Operation Thereof"; Filed Aug. 27, 1997, inventor: Rui Liu.
Philip C. Todd; Snubber Circuits: Theory, Design and Application; 1993 Unitrode Power Supply Design Seminar; pp. 2-1 through 2-17.
J.A. Sabate, V. Vlatkovic, R. B. Ridley and F.C. Lee; High-Voltage, High-Power, ZVS, Full-Bridge PWM Converter Employing an Active Snubber; VPEC Seminar Record 1991; pp. 125-129.
Loveday H. Mweene, Chris A. Wright, and Martin F. Schlect; A 1 kW, 500 kHz Front-End Converter for a Distributed Power Supply System; IEEE Applied Power Electronics Conference Record, 1989, pp. 423-432.

Affiliated with

Also associated with

Rating

Active clamp for buck-based converter and method of operation th does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active clamp for buck-based converter and method of operation th, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active clamp for buck-based converter and method of operation th will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2144238