H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/14 (2006.01) H05B 41/288 (2006.01) H05B 41/292 (2006.01)
Patent
CA 2193680
The invention relates to a circuit arrangement for operating a high pressure discharge lamp comprising input terminals (K1, K2) for connection to a supply voltage source, and means, coupled to the input terminals, for supplying an alternating lamp current to the high pressure discharge lamp. According to the invention, the circuit arrangement also comprises means III for generating a current pulse in each half period of the lamp current, said current pulse having the same polarity as the lamp current and being superimposed on the lamp current in the latter part of a predetermined fraction of the half periods of the lamp current. As a result, flickering of the discharge are during lamp operation is substantially suppressed.
Agencement de circuit pour l'exploitation d'une lampe à décharge à haute pression, comportant des bornes d'entrée (K1, K2) pour le raccordement à une source de tension d'alimentation, et des dispositifs couplés aux bornes d'entrée et destinés à alimenter la lampe à décharge à haute pression en courant alternatif de lampe. Cet agencement de circuit comporte également un dispositif (III) engendrant une impulsion de courant dans chaque demi-période du courant de lampe, ladite impulsion de courant ayant la même polarité que le courant de lampe et étant superposée à ce dernier dans la dernière partie d'une fraction prédéterminée des demi-périodes du courant de lampe. Par conséquent, on peut sensiblement supprimer le tremblotement de l'arc de décharge pendant le fonctionnement de la lampe.
Derra Gunther Hans
Fischer Hanns Ernst
Ganser Hans Gunther
Monch Holger
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
Philips Electronics N.v.
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