Gas discharge lamp drive circuitry

H - Electricity – 05 – B

Patent

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Details

H05B 41/392 (2006.01) H02M 7/48 (2006.01)

Patent

CA 2288874

The present invention relates to an apparatus and method for driving a gas discharge lamp, and in particular for dimming fluorescent lamps or tubes. An electronic circuit for controlling a gas discharge lamp (4) comprises generation means for generating a high frequency pulse train that may be applied to the electrodes of the lamp (4) to light the lamp, means by which the generation means may be connected to an electrical power source, a choke (L3) to limit the current drawn by the lamp (4), means (3) for producing a first (P0) series of pulses and independent from this a second (P1) series of pulses, and means (T0, T1, L3) for combining additively the first and second series of pulses to produce the high frequency pulse train.

La présente invention concerne un dispositif et un procédé permettant d'exciter une lampe à décharge, et en particulier de mettre en veilleuse des lampes ou tubes fluorescents. Un circuit électronique permettant de commander une lampe (4) à décharge dans un gaz comporte un élément destiné à générer un train d'impulsions haute fréquence qui peut être appliqué aux électrodes de la lampe (4) pour l'allumer; un élément grâce auquel l'élément de génération peut être connecté à une alimentation électrique; une bobine d'arrêt (L3) destinée à limiter le courant absorbé par la lampe (4); un élément (3) destiné à produire une première (P0) série d'impulsions et, indépendamment de cette première série, une seconde (P1) série d'impulsions; et des éléments (T0, T1, L3) destinés à combiner en les ajoutant les première et seconde séries d'impulsions dans le but de produire le train d'impulsions haute fréquence.

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