Ballast

H - Electricity – 05 – B

Patent

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Details

H05B 41/36 (2006.01) H05B 41/04 (2006.01) H05B 41/18 (2006.01)

Patent

CA 2203275

A ballast for powering a fluorescent lamp with filaments requiring preheating. Control circuitry within the ballast delays an igniter from being turned on until the filaments have been sufficiently preheated. The control circuitry is isolated and thereby protected from the high voltage pulses of the igniter by an optocoupler. A SIDAC employed in the generation of the high voltage pulses is not relied upon for sensing full arc discharge of the lamp. The breakover voltage of the SIDAC can therefore be set at a much lower than conventional level resulting in the generation of more high voltage pulses over a prefixed period of time.

Ballast servant à alimenter une lampe fluorescente dont les filaments doivent être réchauffés préalablement. Le circuit de commande à l'intérieur du ballast retarde la mise en service d'un allumeur jusqu'à ce que le préchauffage des filaments soit suffisant. Le circuit de commande est isolé et, de ce fait, protégé contre les impulsions de haute tension de l'allumeur par un coupleur optoélectronique. Un dispositif de commutation bilatéral SIDAC utilisé pour générer les impulsions de haute tension n'est pas pris en compte pour détecter la décharge d'arc total de la lampe. La tension d'amorçage du SIDAC peut, par conséquent, être réglée à un niveau beaucoup plus bas que le niveau classique, ce qui permet d'obtenir davantage d'impulsions de haute tension pendant une période prédéterminée.

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