Process and circuit arrangement for operating cold cathode...

H - Electricity – 05 – B

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H05B 41/39 (2006.01) B60Q 3/04 (2006.01) H05B 41/282 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2210878

A first intermediate direct voltage is generated from a current source or on-board voltage, and a second sinusiodal intermediate alternating voltage is generated with a current inverter. This intermediate alternating voltage is transformed by one or more transfer systems to the various triggering and maintaining voltages of different cold cathode discharge lamps. Frequency-synchronous dimming is regulated by the pulse-pause ratio of a pulse group regulator in a broad frame by optically commanded triacs which are triggered in the zero crossing. The preconditions for the starting and maintenance characteristics of the lamps are thus always ensured.

Une tension intermédiaire continue est engendrée par une source de courant ou une source de tension locale, et une tension intermédiaire alternative est engendrée par un inverseur de courant. Cette tension intermédiaire alternative est transformée par un système de transfert ou plus en diverses tensions de déclenchement et d'alimentation pour différentes lampes à décharge à cathode froide. La gradation de l'éclairage synchronisée sur la fréquence est régulée par le rapport impulsion/repos d'un régulateur de trains d'impulsions dans une trame large par des triacs commandés optiquement qui sont déclenchés au point de croisement. Les conditions préliminaires à l'amorçage et à l'alimentation des lampes sont donc toujours réalisées.

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