Fluorescent ballast with emergency lighting capability

Details Fluorescent ballast with emergency lighting capability Fluorescent ballast with emergency lighting capability

2005-01-18

2005-01-18

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Automatic substitution of the power supply

C315S224000, C315S307000, C315S308000

Reexamination Certificate

active

06844682

ABSTRACT:
A gas discharge lighting system with emergency lighting capability includes a gas discharge lighting device, a source of alternating current input power, and an electronic ballasting circuit having a direct current requirement and coupled between the gas discharge lighting device and the source of input power. The electronic ballasting circuit includes an alternating current-to-direct current conversion device, a power regulator connected to the conversion device, a controllable output direct current-to-alternating current inverter operated with a substantially square wave output, an impedance network, a controlling device for controlling the operation of the inverter and delivering power to the gas discharge lighting device, and an external source of direct current input power coupled to an input of the power regulator through an unidirectional current flow device.

REFERENCES:
patent: 4277728 (1981-07-01), Stevens
patent: 5371439 (1994-12-01), Griffin
patent: 5600211 (1997-02-01), Luger
patent: 5677602 (1997-10-01), Paul et al.
patent: 6072283 (2000-06-01), Hedrei et al.
patent: 6259215 (2001-07-01), Roman
patent: 6329761 (2001-12-01), Melis et al.
patent: 6696803 (2004-02-01), Tao et al.

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