Direct current voltage power backup system

Details Direct current voltage power backup system Direct current voltage power backup system

1997-03-11

1998-09-08

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 6, 307 65, 307 66, H02J 700

Patent

active

058048901

ABSTRACT:
A reserve power system for a commercial AC load provides DC power to the load when the primary power fails by providing direct current voltage power from a DC power source which enables the load to continue to operate in a normal fashion. A power system supplying commercial AC derived power to a load provides backup power by coupling DC power to the load when the primary AC power fails. AC power is supplied to a primary winding of a power transformer which also has a secondary winding side. A cable is connected, at a first end, to the secondary winding side and at a second end to a load powered by a commercial AC voltage. A battery DC voltage source and a battery charger are connected to the secondary winding side of the power transformer. The battery charger maintains the integrity of the reserve power. A voltage monitoring circuit connected to the power transformer detects a primary power failure and activates switching circuitry for connecting the DC voltage source directly to the load. A commercial AC load allows a DC voltage to be used for temporary power without adversely affecting the power cabling.

REFERENCES:
patent: 3968417 (1976-07-01), Dials
patent: 4158224 (1979-06-01), Kreyer et al.
patent: 4435743 (1984-03-01), Plumly
patent: 4719550 (1988-01-01), Powell et al.
patent: 5001621 (1991-03-01), Egawa
patent: 5483108 (1996-01-01), Girard et al.

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