Emergency lighting circuits

Details Emergency lighting circuits Emergency lighting circuits

1986-01-21

1987-08-11

Dixon, Harold

Electric lamp and discharge devices: systems

Automatic substitution of the power supply

315 87, 315 90, H05B 3700

Patent

active

046864245

ABSTRACT:
An emergency lighting circuit includes a lamp which can be energized by a battery-inverter circuit upon power failure. The battery is connected to the inverter circuit and the lamp by operation of a relay which is connected to the rectifier supplying charging current to the battery. The rectifier is connected across the line in series with a ballast reactor. The circuit can be used as emergency lighting only or the lamp can be employed for normal lighting purposes and switched to the inverter power when line voltage is interrupted.

REFERENCES:
patent: 3486068 (1969-12-01), Dunn et al.
patent: 3659179 (1972-04-01), Barker et al.
patent: 3833817 (1974-09-01), Patel
patent: 4030013 (1977-06-01), Watrous
patent: 4057750 (1977-11-01), Elms et al.
patent: 4216410 (1980-08-01), Feldstein
patent: 4323820 (1982-04-01), Teich
patent: 4454452 (1984-06-01), Feldstein

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