Circuit for operating a discharge lamp

Details Circuit for operating a discharge lamp Circuit for operating a discharge lamp

H - Electricity

05

B

H05B 41/14 (2006.01) H05B 41/285 (2006.01)

Patent

CA 2213247

The invention concerns a circuit for operating a discharge lamp with a half- bridge generator (T1, T2), wherein a turn-off transistor (T3) can stop the half-bridge generator. The energy source for the base current of the turn-off transistor (T3) is formed by a starter capacitor (C3) which starts the half- bridge generator (T1, T2). In addition, the collector-emitter section of the turn-off transistor (T3) is directly between the base of the lower transistor (T2) of the half-bridge generator and earth.

La présente invention concerne un circuit destiné à faire fonctionner une lampe à décharge, et comprenant un générateur en demi-pont (T1, T2) qu'un transistor de coupure (T3) peut arrêter. La source d'énergie, pour le courant de base du transistor de coupure (T3), est constituée par un condensateur de démarrage (C3) pour faire démarrer le générateur en demi-pont (T1, T2). En outre, le parcours collecteur-émetteur du transistor de coupure (T3) se trouve directement entre la base du transistor inférieur (T2) du générateur en demi-pont et la masse.

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