Dc-ac converter for igniting and supplying a gas discharge lamp

H - Electricity – 05 – B

Patent

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Details

H05B 41/298 (2006.01) H05B 41/29 (1990.01)

Patent

CA 2089772

A DC-AC converter for igniting and supplying a gas discharge lamp comprises a converter control circuit including a starter circuit containing first, second and third switching elements; a load circuit including at least one gas discharge lamp; and an igniting circuit including a fourth switching element, wherein the converter control circuit controls a current through the lamp via a current sensor resistor during a pre-heating stage; the igniting circuit disenables the third switching element and thereby isolates the converter control circuit during an igniting stage; and the converter control circuit controls the current through the lamp via the current sensor resistor during normal operation.

Un convertisseur continu-alternatif pour amorcer et alimenter une lampe à décharge gazeuse comprend un circuit de commande du convertisseur comportant un circuit starter qui contient un premier, un deuxième et un troisième élément de commutation; un circuit d'utilisation comportant au moins une lampe à décharge gazeuse; et un circuit d'amorçage comportant un quatrième élément de commutation. Le circuit de commande du convertisseur contrôle le courant qui passe dans la lampe au moyen d'une résistance de détection de courant durant une étape de préchauffage; le circuit d'amorçage désactive le troisième élément de commutation et isole ainsi le circuit de commande du convertisseur durant une étape d'amorçage; et le circuit de commande du convertisseur contrôle le courant qui passe dans la lampe au moyen de la résistance de détection de courant durant le fonctionnement normal.

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