Emergency lighting system

Details Emergency lighting system Emergency lighting system

H - Electricity

02

J

315/23

H02J 9/06 (2006.01) H02J 7/00 (2006.01) H02J 7/02 (2006.01)

Patent

CA 1041595

ABSTRACT OF THE DISCLOSURE: An emergency lighting system that includes an electric discharge lamp and a DC - AC converter to sup- ply emergency power to the lamp upon failure of the AC line voltage. A battery is charged with a constant cur- rent from the AC supply voltage. A transistor switching device connects the battery to the converter when a sensing device senses the absence of the AC voltage. A bias voltage that holds the switching device closed is derived from the battery via the emitter-collector path of the transistor switch. A given drop in the bat- tery voltage is sensed to open the switching device to prevent an excessive current drain on the battery. The presence of the AC voltage is sensed to hold the switch- ing device open and thereby prevent operation of the con- verter during normal operation of the lighting system. - 17 -

199722

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