Transient control circuit for fluorescent lamp systems

Details Transient control circuit for fluorescent lamp systems Transient control circuit for fluorescent lamp systems

H - Electricity

05

B

315/29, 315/36

H05B 37/02 (2006.01) H05B 39/04 (2006.01) H05B 41/36 (2006.01)

Patent

CA 1265576

Abstract of the Invention A method and apparatus are provided for operating a fluo- rescent lamp illumination control system which comprises an AC voltage source for supplying power to an electrical load com- prising a standard transformer-ballast unit driving a fluore- scent lamp or lamps which have externally heated cathodes, and a power controller, which includes a capacitive synchronous switch formed by an electronic switch and shunt capacitor, for controlling the "on" time of the lamp or lamps to thereby vary the luminance output thereof to values less than the nominal rated value. The invention provides heating of the lamp cath- odes prior to arc ignition, provides arc ignition at a lower arc current level than that for full-on operation, and provides for subsequently gradually increasing the arc current after the arc is struck to a value providing the desired illumination level.

509115

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