Remote d.c. power supply with automatic backup power feature

Details Remote d.c. power supply with automatic backup power feature Remote d.c. power supply with automatic backup power feature

1997-05-05

1999-08-17

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 64, 307 85, 307 18, 307 23, H02J 700

Patent

active

059398019

ABSTRACT:
Apparatus for controlling distribution of d.c. power to a plurality of remote d.c.-powered LAN transceivers, which includes a plurality of primary d.c. power supplies and at least one backup d.c. power supply, all having means for connection to a source of electrical power to provide output d.c. power independently of each other. A plurality of electrical switches are each operable in a first mode of operation to connect one of the primary power supplies to at least one set of output terminals for connection to a remote transceiver. Comparator circuits compare the output voltage at each of the primary power supplies to the output voltage at the backup power supply to indicate a failure condition at one of the primary supplies. Circuitry is responsive to a failure indication for operating one or more of the electrical switches in a second mode of operation in which at least one set of output terminals is connected to the backup power supply. Thus, the output terminals and LAN transceivers connected thereto are continuously supplied with uninterrupted electrical power in the event of a power failure at one or more of the primary power supplies.

REFERENCES:
patent: 4401895 (1983-08-01), Petkovsek
patent: 5089937 (1992-02-01), Carrubba et al.
patent: 5315533 (1994-05-01), Stich et al.
patent: 5534734 (1996-07-01), Pugh et al.
patent: 5616968 (1997-04-01), Fujii et al.
patent: 5642002 (1997-06-01), Mekanik et al.

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