Circuit for operating high-pressure discharge lamps

H - Electricity – 05 – B

Patent

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H05B 41/288 (2006.01)

Patent

CA 2533261

The invention relates to a circuit for operating high-pressure discharge lamps, wherein a voltage transformer for power supply to a loading circuit comprises a connection for the high-pressure discharge lamp (La) and for the secondary winding (L1b) of an ignition transformer (T1) for an impulse ignition system for igniting a gaseous discharge in said high-pressure discharge lamp. The inventive circuit is characterised in that the loading circuit comprises at least one capacitor (C1) which is in series arranged with the secondary winding (L1b) of the ignition transformer (T1) when the impulse ignition system is reconnected, the capacity of the capacitor (C1) being selected in such away that said capacitor (C1) substentially forms a bridging for ignition impulses generated by the impulse ignition device in such a way that after ignition of the gaseous discharge in the high-pressure discharge lamp (La), at least one partial compensation of the ignition transformer (T1) is produced when the lamp current passes through the secondary winding (L1b).

L'invention concerne un circuit pour faire fonctionner des lampes à décharge à haute pression. Ce circuit comprend un transformateur de tension servant à alimenter en énergie un circuit de charge comprenant des raccords pour une lampe à décharge à haute pression (La) et pour l'enroulement secondaire (L1b) d'un transformateur d'amorçage (T1) d'un dispositif d'amorçage à impulsions servant à amorcer la décharge gazeuse dans la lampe à décharge à haute pression (La). Le circuit selon l'invention se caractérise en ce que le circuit de charge comprend au moins un condensateur (C1) qui est monté en série avec l'enroulement secondaire (L1b) du transformateur d'amorçage (T1) lorsque le dispositif d'amorçage à impulsions est raccordé, la capacité de ce condensateur (C1) étant sélectionnée de telle sorte que ledit condensateur (C1) constitue sensiblement un court-circuit pour les impulsions d'amorçage générées par le dispositif d'amorçage à impulsions et de sorte qu'après l'amorçage de la décharge gazeuse dans la lampe à décharge à haute pression (La), il produise au moins une compensation partielle de l'inductance du transformateur d'amorçage (T1) lorsque l'enroulement secondaire (L1b) est parcouru par le courant de la lampe.

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