Electronic ballast

H - Electricity – 05 – B

Patent

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Details

H05B 41/28 (2006.01)

Patent

CA 2451440

An electronic ballast for driving a gas discharge lamp includes a rectifier, a valley-fill circuit, an inverter having first and second series-connected controllably conductive device having complementary duty cycles, a control circuit for controlling the controllably conductive device, and an independent cat ear power supply to provide power to the ballast control circuits. The result is a ballast having substantially improved THD, and current crest factor. In a preferred embodiment, the valley-fill circuit includes an energy storage device that stores energy in response to a controllably conductive device. In an especially preferred embodiment, the controllably conductive device of the valley-fill circuit is also one of the controllably conductive devices of the inverter.

Cette invention concerne un ballast électronique destiné à commander une lampe à décharge gazeuse, qui comprend un redresseur, un circuit lissé, un inverseur doté d'un premier et d'un second dispositif à conductivité contrôlée reliés en série dont les cycles de travail sont complémentaires, un circuit de commande commandant le dispositif à conductivité contrôlée, et une alimentation indépendante qui alimente les circuits de commande de ballast. Il en résulte un ballast caractérisée par une distorsion harmonique totale et un facteur de crête sensiblement améliorés. Dans un mode de réalisation préféré, le circuit de lissage comprend un dispositif de stockage d'énergie qui emmagasine de l'énergie en réponse à un dispositif à conductivité contrôlée. Idéalement, ce dispositif à conductivité contrôlée du circuit de lissage fait également partie des dispositifs à conductivité contrôlée de l'inverseur.

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