Remote control of fluorescent lamp ballast using power flow...

H - Electricity – 05 – B

Patent

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Details

H05B 41/39 (2006.01) H02J 13/00 (2006.01) H05B 37/02 (2006.01) H05B 41/36 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2049075

A dimming ballast system wherein the light output of the lamp is controlled by a remote source. The ballast output voltage is regulated by a voltage control feedback loop, the dimming function being achieved by varying the set point of the control loop. The remote control signal, coded by interrupting the current flow to the ballast for a short period, is processed digitally by a microcomputer which generates information to vary the control set point. Circuit means are provided to control the filament voltage of the fluorescent lamps such that as the lamps are dimmed down, the filament voltage is maintained or slightly increased, thus prolonging lamp life and stabilizing the lamp light output.

L'invention est un régulateur gradateur d'éclairage télécommandé. La tension de sortie de ce régulateur est commandée par une boucle à rétroaction, la gradation étant obtenue en faisant varier la position du point de consigne de cette boucle de commande. Le signal de télécommande, qui est codé par une brève interruption du courant transmis au régulateur, est traité numériquement par un micro-ordinateur qui produit les informations utilisées pour faire varier la position du point de consigne. Un circuit est utilisé pour commander la tension des filaments des lampes fluorescentes de telle façon que, quand on réduit l'éclairage, cette tension est maintenue au même niveau ou est même légèrement augmentée, ce qui prolonge la durée de vie des lampes et stabilise l'intensité de l'éclairage.

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