Internal power supply for a ballast

H - Electricity – 05 – B

Patent

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Details

H05B 41/282 (2006.01)

Patent

CA 2729472

A ballast used with an input power source for energizing a lamp. The ballast includes a power stage, a controller, an internal power supply for the power stage and the controller, and an input switch. The power stage energizes the lamp with power supplied by the input power source. The internal power supply is connected to the power stage for receiving power from the power stage and is connected to the input power source via the input switch for receiving power from the input power supply when the input switch operates in a closed mode. When the input switch operates in an open mode it electrically disconnects the internal power supply from the input power source. The controller selectively operates the input switch in the open mode and the closed mode as a function of the voltage of the internal power supply while the lamp is energized.

L'invention porte sur un ballast utilisé avec une source de courant d'entrée alimentant une lampe. Le ballast comprend: un étage d'alimentation, un contrôleur, une alimentation intérieure de l'étage d'alimentation et du contrôleur, et un commutateur d'entrée. L'étage d'alimentation alimente la lampe avec le courant de ladite source de courant d'entrée. L'alimentation intérieure est reliée à l'étage d'alimentation pour en recevoir le courant, et à la source de courant via le commutateur d'entrée pour en recevoir le courant quand le commutateur fonctionne en mode fermé. Quand le commutateur d'entrée fonctionne en mode ouvert, il déconnecte l'alimentation intérieure de la source de courant d'entrée. Le contrôleur fait passer le commutateur d'entrée en mode ouvert ou en mode fermé en fonction de la tension de l'alimentation intérieure lorsque la lampe est sous tension.

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