Ballast

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H - Electricity

05

B

H05B 41/36 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2257640

A dimming interface for translating the conduction pulse width of a signal produced by a triac dimmer into a proportional rectified average voltage serving as a dimming signal. The dimming signal is supplied as an input to an IC driver in controlling the level of lamp illumination. The proportional rectified average voltage can be converted into a signal representing a duty cycle whereby variation in the main line voltage does not affect the dimming signal.

L'invention concerne une interface de gradation permettant de transformer la largeur d'impulsions de conduction d'un signal produit par un gradateur à triac en une tension moyenne rectifiée proportionnelle qui sert de signal de gradation. Le signal de gradation est fourni comme signal d'entrée à un organe de commande à circuit intégré au moment du réglage du niveau d'illumination de la lampe. La tension moyenne rectifiée proportionnelle peut être transformée en un signal représentant un cycle d'utilisation; ainsi, une variation de la tension de secteur n'a pas d'effet sur le signal de gradation.

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