Circuit arrangement

Details Circuit arrangement Circuit arrangement

H - Electricity

05

B

H05B 41/04 (2006.01) H05B 41/288 (2006.01) H05B 41/292 (2006.01) H05B 41/38 (2006.01)

Patent

CA 2189265

The invention relates to a circuit arrangement for igniting a high-pressure discharge lamp (L), provided with: input terminals (C, D) for connection to a supply source; a pulse generating circuit (IV) having a natural frequency and provided with a voltage-dependent breakdown element (3); a pulse transformer (1); and an electrical connection between a secondary winding (11, 12) of the pulse transformer and lamp connection points (E, F). According to the invention, the secondary winding is partly shunted by capacitive means (41, 42). This promotes current take-over after lamp breakdown.

L'invention concerne un montage de circuit destiné à l'allumage d'une lampe à décharge à haute pression (L), comprenant des bornes d'entrée (C, D) pour la connexion à une source d'alimentation, un circuit (IV) générateur d'impulsions présentant une fréquence naturelle et doté d'un élément de claquage (3) dépendant de la tension, un transformateur (1) d'impulsions, et une connexion électrique entre un enroulement secondaire (11, 12) du transformateur d'impulsions et des points de connexion (E, F) de la lampe. Selon l'invention, l'enroulement secondaire est partiellement shunté par des moyens capacitifs (41, 42). Ce montage favorise une reprise de courant après une décharge disruptive de la lampe.

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