Low frequency square wave electronic ballast for gas...

H - Electricity – 05 – B

Patent

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H05B 41/16 (2006.01)

Patent

CA 2167189

A low frequency square wave electronic ballast used for a gas discharge device includes a high power factor pre-regulator connected to a sinusoidal AC power supply and a power controlled DC current source connected to the pre-regulator. A low frequency square wave DC-to-AC inverter is connected to the DC current source and an ignitor circuit is connected to the inverter. A monitor circuit as well as a low power stabilized logic supply voltage source are also employed. The entire circuit is connected to a gas discharge device such that the instantaneous power of this device is constant and controlled providing an acoustic resonance free operation and an ideal ballast curve.

Un ballast électronique a ondes rectangulaires de basse fréquence utilisé pour un dispositif d'excitation à décharge de gaz comprend un pré-régulateur de facteur de puissance élevé (Unité 1) connecté à une alimentation à courant alternatif sinusoidal et une source de courant continue régulée (unité 2) connectée au pré-régulateur (Unité 1). Un onduleur c.c./c.a. à ondes carrées de basse fréquence (Unité 4) est connecté à l'onduleur (P.U. - 3). Un circuit de contrôle (Unité 6) ainsi qu'une source de tension d'alimentation stabilisée de faible puissance (Unité 5) sont également utilisés. Tout le circuit est connecté à un dispositif à gaz lumineux (lampe HID) de sorte que la puissance instantanée de ce dispositif est constante et commandée, son fonctionnement est exempt de résonance acoustique et sa courbe de ballast est idéale.

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