H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/23
H05B 41/00 (2006.01)
Patent
CA 1110317
ABSTRACT OF THE DISCLOSURE An emergency lighting system includes a two-level switching transistor inventor circuit for starting and operating a fluorescent lamp from a battery upon failure of line voltage. One of the switching transistors of the two transistor inverter is arranged for connection first to a tap, then to one of the feed-in terminals of an output transformer coupled with the lamp. A timing controller effects this switching thereby to provide, first, a high power level for starting the lamp, and then, a second lower power level for operating the lamp after starting.
269243
Alley Robert P.
Klett Keith K.
Company General Electric
Eckersley Raymond A.
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