Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1995-11-14
1997-09-30
Hecker, Stuart N.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323272, 363 69, 307 53, G05F 140
Patent
active
056729588
ABSTRACT:
A feedback sensing system including a control circuit for detecting power failure of either power supply, and for controlling first and second switch circuits to modify the feedback sensing path of the other supply to the output load. In this manner, when one power supply fails, the feedback sensing path of the other power supply is rerouted to the output node to directly monitor and regulate the voltage across the load. Each switch circuit preferably operates to switch between two nodes along the respective output paths of the power supply, including a first node located before the current control device and a second node located between the current control device and the load. In one embodiment, each switch circuit includes two switches operated in a mutually-exclusive manner. In another embodiment, each switch circuit includes a relatively low value resistive device coupled between the output sense input and the first node, and a switch coupled between the output sense input and the second node for swamping the resistive device when activated or otherwise turned on.
REFERENCES:
patent: 3808452 (1974-04-01), Hutchinson
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patent: 4074182 (1978-02-01), Weischedel
patent: 4359679 (1982-11-01), Regan
patent: 5319536 (1994-06-01), Malik
patent: 5428523 (1995-06-01), McDonnal
patent: 5428524 (1995-06-01), Massie
Brown Alan E.
Wiscombe Nathan
Dell USA L.P.
Hecker Stuart N.
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