Power signal combining method and apparatus

Details Power signal combining method and apparatus Power signal combining method and apparatus

1994-04-08

1996-09-03

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Selective or optional sources

323282, 323285, 323290, 307 77, 363 59, H02J 346

Patent

active

055526438

ABSTRACT:
A buck-topology switching power supply (100) combines a plurality, n, of signals (111, 121, 131) from a like number (n) of substantially direct-current power sources by means of a single inductor (150). As k varies from 1 to n, a controller (170) acts to couple each signal.sub.k in sequence to the inductor input (140) for an"on" duty period t.sub.k at a predetermined switching frequency, f, thus forming at the inductor output (160) an output signal having an output voltage V.sub.o and an output power P.sub.o. Under static load conditions, the controller holds the corresponding duty period t.sub.k for each signal.sub.k at a substantially constant value. Under dynamic load conditions, however, the controller dynamically adjusts the corresponding duty period t.sub.k in order to maintain the fractional power contribution P.sub.k for each signal.sub.k relative to the output power P.sub.o at a predetermined value.

REFERENCES:
patent: 4733158 (1988-03-01), Marchione
patent: 4862013 (1989-08-01), Konopka
patent: 5144222 (1992-09-01), Herbert
patent: 5278453 (1994-01-01), Pollmeier
Marty Brown, "Practical Switching Power Supply Design," copyright 1990 by Academic Press, Inc., San Diego, California, especially pp. 5-6, 20-23, and 90-94.

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