Synchronous power rectifier

Details Synchronous power rectifier Synchronous power rectifier

1986-09-22

1987-12-29

Wong, Peter S.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 89, H02M 7217

Patent

active

047165146

ABSTRACT:
A synchronous power rectifier incorporating a bipolar power transistor operable in a switching mode to rectify the energy from a secondary winding of a power transformer. The synchronous rectifier reduces or eliminates the need of rectifier diodes, which provides power rectification without the power loss associated with the rectifier diode voltage drops. Moreover, the present invention includes further refinements of the circuit, including adjustment of the rectifier switching time to accommodate delayed turn-off times of bipolar power devices, and adjustment of the switching signal duration to provide output voltage regulation independent of the excitation of the transformer primary. The resulting embodiments of the present invention provide a modular switching power supply circuit of high efficiency, which may be operable together in combination to provide multiple output voltages.

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Milewski, IBM Technical Disclosure Bulletin, vol. 20, No. 11A, pp. 4272-4275, Apr. 1978.
Patel, "Using Bipolar Synchronous Rectifiers Improve Power Supply Efficiency", Power Sources Conference, Nov. 1984.
Blanchard, "MOSFET's, Schottky Diodes viz for Low-Voltage Supply Designs", E.D.N., Jun. 28, 1984.
Ruble; "Bilateral MOSFET's Solve a Range of AC Control Problems", Electronic Design; Aug. 23, 1984; pp. 211-214.sup.+.

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