Low loss synchronous rectifier for application to clamped-mode p

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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363 20, 363 89, 363147, 327309, H02M 7217, H02M 3335

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active

056255411

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 bipolar 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 bipolar rectifier device may also be embodied as a MOSFET device. The subject rectifier may be used in both forward- and flyback-type power converters.

REFERENCES:
patent: 5066900 (1991-11-01), Bassett
patent: 5126931 (1992-06-01), Jitaru
patent: 5268830 (1993-12-01), Loftus, Jr.
patent: 5274543 (1993-12-01), Loftus, Jr.
patent: 5303138 (1994-04-01), Rozman
patent: 5353212 (1994-10-01), Loftus, Jr.
patent: 5528482 (1996-06-01), Rozman

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