Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1995-04-06
1998-12-01
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 64, 307 65, H02J 700
Patent
active
058443282
ABSTRACT:
A backup power system for a structural appliance normally operated by a primary source of AC current through a primary circuit includes a backup battery; a charging circuit for connecting the primary source to the backup battery and including a battery charger for charging the backup battery; a backup circuit for connecting the backup battery to the appliance and including a converter for converting DC current from the backup battery to AC current for the appliance; and a switch interposed in the primary circuit and the backup circuit for selectively closing the primary circuit and opening the backup circuit during normal operation of the primary source, and for closing the backup circuit upon at least partial failure of the primary source so as to connect the backup battery to the appliance through the converter, whereby the backup battery is charged and isolated from the appliance during normal operation of the primary source, and the backup battery is connected through the converter to the appliance for supplying AC current to the appliance upon failure of the primary source.
REFERENCES:
patent: 3683198 (1972-08-01), Thode
patent: 4366390 (1982-12-01), Bathmann
patent: 4471233 (1984-09-01), Roberts
patent: 4673826 (1987-06-01), Masson
patent: 4703191 (1987-10-01), Ferguson
patent: 4939432 (1990-07-01), Tsai
patent: 4946096 (1990-08-01), Ballard et al.
patent: 5315533 (1994-05-01), Stich et al.
Lockett Kim
Shoop Jr. William M.
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