Circuit arrangement

H - Electricity – 05 – B

Patent

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Details

H05B 41/14 (2006.01) H05B 41/288 (2006.01) H05B 41/292 (2006.01)

Patent

CA 2164511

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 commutating supply source with a square-wave supply voltage; a pulse-generating circuit (IV) provided with a voltage- dependent breakdown element (3) and with a voltage-raising network (2) formed by a network of rectifying and capacitive means; a pulse transformer (1); and an electrical connection between a secondary winding (12) of the pulse transformer and lamp connection terminals (E, F). According to the invention, the voltage-raising network (2) is in addition provided with inductive means (21, 22). The result of this is that a strongly increased voltage is available across the breakdown element substantially instantaneously after each commutation of the commutating supply voltage.

La présente invention concerne une configuration de circuit pour l'allumage d'une lampe à décharge à haute pression (L), dotée: de bornes d'entrée (C, D) pour le branchement sur une source de courant à commutation, la tension du secteur étant à deux niveaux d'intensité; d'un circuit générateur d'impulsions (IV) pourvu d'un élément (3) de rupture dépendant de la tension et d'un réseau (2) générateur d'un gain de tension, formé par un réseau d'éléments redresseurs et capacitifs; d'un transformateur d'impulsions (1); et d'une connexion électrique entre un enroulement secondaire (12) du transformateur d'impulsions et les bornes (E, F) de connexion de la lampe. Selon l'invention, le réseau (2) générateur d'un gain de tension est, en plus, pourvu d'éléments inducteurs (21, 22), d'où un important gain de tension, disponible dans tout l'élément de rupture, pratiquement tout de suite après chaque commutation de la tension du secteur.

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