Method of operating at least one fluorescent lamp with...

H - Electricity – 05 – B

Patent

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H05B 41/298 (2006.01)

Patent

CA 2195440

The invention concerns a method of operating at least one fluorescent lamp (FL) by means of electronic ballast and the ballast itself. A rectifier bridge (GL) at a.c. supply voltage (L, N), a connected high-value regulator (L1, D1, V1), a half-bridge circuit (V2, V3) and a control and regulating circuit (IC) are provided for continuously monitoring the lamp current with a regulated control circuit (CCO, SEL, HSD, LSD) for the power transistors (V2, V3) which maintains the bulb current constant during normal operation. As a master control system, a time-value emitting device (PST, IT, CT), which is activated in a specific manner whenever the lamp is activated or a fault is detected, generates a time base for a monitoring circuit (MON) which evaluates the lamp current at any particular moment at predetermined reference levels (Mp, Mi and Mo) which differ in individual time sections (.DELTA.pt, .DELTA.it, .DELTA.st, .DELTA.ot) and which, via the regulated control circuit (CCO, IST, SEL, HSD, LSD), controls the lamp current as a function of time if the lamp starts normally and triggers automatic switching-off of the electronic ballast in the event of a fault.

L'invention concerne un procédé permettant de faire fonctionner au moins une lampe à fluorescence (FL) au moyen d'un ballast électronique, ainsi que le ballast lui-même. Il est prévu un pont redresseur (GL) sous une tension d'alimentation alternative (L, N), un régulateur valeur haute connecté (L1, D1, V1), un circuit demi-pont (V2, V3), ainsi qu'un circuit de commande et de régulation (IC) pour le contrôle en continu du courant de la lampe avec un circuit de commande régulé (CCO, SEL, HSD, LSD) pour les transistors de puissance (V2, V3) qui, en fonctionnement normal, maintient le courant de la lampe constant. Comme régulateur pilote, un émetteur de valeurs temporelles (PST, IT, CT) amorcé de façon définie à chaque allumage ou détection d'un défaut, fournit une base de temps pour un circuit de contrôle (MON) qui évalue le courant de la lampe à un moment déterminé, à des niveaux de référence prédéterminés (Mp, Mi ou Mo) qui diffèrent dans des tranches de temps individuelles (.DELTA.pt, .DELTA.it, .DELTA.st, .DELTA.ot), et qui contrôle, en fonction du temps, par l'intermédiaire d'un circuit de commande régulé (CCO, IST, SEL, HSD, LSD), le courant de la lampe pour un allumage normal ou déclenche, en cas d'anomalie, une mise hors-tension automatique du ballast électronique.

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