Low loss synchronous rectifier for application to clamped-mode p

Details Low loss synchronous rectifier for application to clamped-mode p Low loss synchronous rectifier for application to clamped-mode p

1996-08-28

1999-02-16

Riley, Shawn

Electric power conversion systems

Current conversion

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

363 89, 363 97, 363127, 363131, H02M 3335

Patent

active

058727051

ABSTRACT:
A synchronous rectifier for use with a clamped-mode power converter uses in one embodiment a hybrid rectifier with a MOSFET rectifying device active in one first cyclic interval of the conduction
onconduction sequence of the power switch and a second rectifying device embodied in one illustrative embodiment as a low voltage diode rectifying device active during an alternative interval to the first conduction
onconduction interval. The gate drive to the MOSFET device is continuous at a constant level for substantially all of the second interval which enhances efficiency of the rectifier. The diode rectifier device may also be embodied as a MOSFET device. The subject rectifier may be used in both forward and flyback power converters.

REFERENCES:
patent: 4675797 (1987-06-01), Vinciarelli
patent: 5066900 (1991-11-01), Bassett
patent: 5126931 (1992-06-01), Jitaru
patent: 5274543 (1993-12-01), Loftus, Jr.
patent: 5303138 (1994-04-01), Rozman
patent: 5528482 (1996-06-01), Rozman
patent: 5535112 (1996-07-01), Vazquez Lopez
Acker, Brian et al., 1994 IEEE, "Current-Controlled Synchronous Rectification," University of California, Berkeley, CA, pp. 185-191.
Jitaru, Ionel Dan et al., 1994 IEEE, "High Efficiency DC-DC Converter," Polytechnic Institute of Bucharest, Bucharest, Romania, pp. 638-644.

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