Apparatus and method for controlling the filament voltage in...

H - Electricity – 05 – B

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H05B 41/00 (2006.01)

Patent

CA 2632000

An electronic dimming ballast comprises a filament turn-off circuit for controlling the magnitudes of filament voltages supplied to the filaments of a gas discharge lamp. Each of a plurality of filament windings is directly coupled to one of the filaments and is operable to supply a small AC filament voltage to the filaments. The plurality of filament windings and a control winding are loosely magnetically coupled to a resonant inductor of an output circuit of the ballast. A controllably conductive device is coupled across the control winding. When the controllably conductive device is conductive, the voltage across the control winding and the filament windings falls to zero volts. The controllably conductive device is driven with a pulse-width modulated (PWM) signal so as to control the magnitudes of the filament voltages. The filament voltages are provided to the filaments before striking the lamp, and when dimming the lamp near low end.

L'invention concerne un ballast de gradation électronique comprenant un circuit d'extinction de filaments régulant les amplitudes des tensions de chauffage fournies aux filaments d'une lampe à décharge gazeuse. Chaque bobinage d'une pluralité de bobinages filamentaires est couplé directement à l'un des filaments et permet de fournir une faible tension de chauffage CA aux filaments. La pluralité de bobinages filamentaires et un bobinage de régulation sont couplés magnétiquement de manière lâche à une bobine d'induction résonante d'un circuit de sortie du ballast. Un dispositif à conduction régulable est couplé dans le bobinage de régulation. Lorsque le dispositif à conduction régulable est conducteur, la tension dans le bobinage de régulation et les bobinages filamentaires tombe à zéro volt. Le dispositif à conduction régulable est commandé au moyen d'un signal à modulation d'impulsion en durée (PWM) en vue de la régulation des amplitudes des tensions de chauffage. Les tensions de chauffage sont fournies aux filaments avant l'allumage de la lampe, et lors d'une gradation de l'intensité lumineuse de la lampe vers le niveau le plus bas.

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