Emergency sign and control circuit

Details Emergency sign and control circuit Emergency sign and control circuit

1993-01-06

1995-08-29

Peng, John K.

Communications: electrical

Systems

Periodic or flashing

340332, 340333, 340691, 340693, 34081542, 34081545, 34081569, 40570, 362 31, 362800, G08B 2700, G08B 500, F21V 700

Patent

active

054464404

ABSTRACT:
A centrally powered, low voltage emergency sign and control circuit using high voltage AC power simultaneously providing continuous low voltage DC power to a plurality of emergency signs connected in parallel through a plurality of branch circuits and to continuously charge a single battery backup to all of the emergency signs should AC power fail. Each emergency sign is illuminated by electroluminescent diodes which are individually connected in parallel and in series throughout the emergency sign. When a fire alarm or emergency situation exists, the control circuit pulses the low voltage DC power to the emergency signs causing the LEDs to flash regardless if the control circuit is powered by high voltage AC power or backup battery power.

REFERENCES:
patent: 3916404 (1975-10-01), Gouge
patent: 4199754 (1980-04-01), Johnson et al.
patent: 4283657 (1981-08-01), Gordon et al.
patent: 4298869 (1981-11-01), Okuno
patent: 4544910 (1985-10-01), Hoberman
patent: 4682147 (1987-07-01), Bowman
patent: 4929936 (1990-05-01), Friedman et al.
patent: 4988889 (1991-01-01), Oughton, Jr.
patent: 5018290 (1991-05-01), Kozek et al.
patent: 5040320 (1991-08-01), Reidinger
patent: 5105568 (1992-04-01), Branning
patent: 5149185 (1992-09-01), Mandy
patent: 5151679 (1992-09-01), Dimmick

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