Forward converter with active clamp circuit

Details Forward converter with active clamp circuit Forward converter with active clamp circuit

1999-04-07

2000-05-09

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

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

363 97, 363131, H02M 3335

Patent

active

060612541

ABSTRACT:
A forward converter has provided in a primary circuit of a transformer (7) included therein an active clamp circuit comprising an auxiliary coil (9) provided separately from a primary coil (8) of the transformer (7), auxiliary switching element (2) and a capacitor (3), the auxiliary switching element (2) being turned on for a reset period of a main switching element (1) connected in series to the primary coil (8) is turned off, to clamp a voltage across the main switching element (1). Since the operating waveform of the transformer (7) is a square one, a synchronous rectifier is provided in a secondary circuit of the transformer (7) to attain a high efficiency of the forward converter itself. Also, since no isolation element such as a pulse transformer, etc. is required, the forward converter can be designed compact and for higher efficiency and lower cost.

REFERENCES:
patent: 5309344 (1994-05-01), Smith
patent: 5471376 (1995-11-01), Tsai et al.
patent: 5521807 (1996-05-01), Chen
patent: 5781421 (1998-07-01), Steigerwald et al.
patent: 5815380 (1998-09-01), Cuk et al.
patent: 5862043 (1999-01-01), Youn et al.
patent: 5872705 (1999-02-01), Loftus, Jr.
patent: 5886508 (1999-03-01), Jutras
Record of the 29th Annual IEEE Power Electronics Specialists Conference, vol. 2, Fukuoka, Japan, May 17-22, 1998, pp. 1237-1242.

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