Electronic ballast system having emergency lighting...

Details Electronic ballast system having emergency lighting... Electronic ballast system having emergency lighting...

2006-08-01

2006-08-01

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S291000, C307S064000

Reexamination Certificate

active

07084582

ABSTRACT:
An electronic ballast system is intended to operate one or more fluorescent lamps and a subsystem with universal input from 108V to 305V, a battery, and battery charger, associated logic, and a provision for emergency lighting, as well as for operating at least one of any combination of fluorescent lamps. The electronic ballast system includes a circuit that allows for a fluorescent lamp to be energized without the preheating of its cathodes, a circuit for power factor correction that makes use of an average current mode implemented by a pulse-width modulator in order to derive a power factor that approaches unity for the electronic power circuit. The ballast circuit further comprises an electronic chip adapted to control the circuit and prevent high voltage increase in the lamps.

REFERENCES:
patent: 5363020 (1994-11-01), Chen et al.
patent: 5907223 (1999-05-01), Gu et al.
patent: 6031342 (2000-02-01), Ribarich et al.
patent: 6291944 (2001-09-01), Hesterman et al.

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