Emergency lighting system

Details Emergency lighting system Emergency lighting system

1976-08-26

1978-02-21

Schaefer, Robert K.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 64, H02J 700, H02J 900

Patent

active

040755037

ABSTRACT:
An emergency lighting system including an inverter for operating a fluorescent lamp from a battery upon failure of the primary AC voltage source. A transformer connected to the AC source is provided with a single secondary winding for providing both current for charging the battery and a voltage proportional to the AC voltage to circuit inhibit means for allowing inverter operation when AC voltage falls below a predetermined level.

REFERENCES:
patent: 3129373 (1964-04-01), Godshalk et al.
patent: 3836815 (1974-09-01), Herzog
patent: 3921005 (1975-11-01), Watrous
patent: 3925772 (1975-12-01), Miller et al.
patent: 4029993 (1977-06-01), Alley et al.

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