Fluorescent lamp controller

Details Fluorescent lamp controller Fluorescent lamp controller

1991-01-08

1992-05-05

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Transformer in the condenser load device circuit

315101, 315205, 315207, 315DIG5, H05B 4114

Patent

active

051111152

ABSTRACT:
A circuit suitable for the instantaneous starting, continuation, and interruption of current through one or more gasfilled discharge tubes, in particular fluorescent lamps, is described. The circuit and lamp heaters are energized before instantaneous control can occur. One preferred silicon controlled rectifier (SCR) is used with a bridge rectifier. The SCR has the dual role of causing the capacitor to discharge through the pulse transformer, the secondary pulse voltage of which thereby causes the arc to strike immediately upon application of gate current, and then maintianing the lamp current as long as a supply of SCR gate current is provided. A second preferred control device, a TRIAC, is used without a bridge rectifier and again has a dual role of pulse-starting and maintaining current. This type of device is more conveniently arranged to provide for a dimming function as well. Applications include "flashing" advertising signs, general illumination, and signals.

REFERENCES:
patent: 3626243 (1971-12-01), Koyama et al.
patent: 3710185 (1973-01-01), Switson
patent: 4360762 (1982-11-01), Yamamoto et al.

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