Dimmable single stage electronic ballast with high power factor

Details Dimmable single stage electronic ballast with high power factor Dimmable single stage electronic ballast with high power factor

H - Electricity

05

B

H05B 41/14 (2006.01) H05B 41/36 (2006.01)

Patent

CA 2727529

This invention provides an electronic ballast for a fluorescent lamp, including a rectifier for converting an alternat-ing current input voltage into a direct current output voltage, and a circuit including a combined power factor correction (PFC) stage and an inverter, wherein the PFC stage and the inverter share a switch. Also provided is a controller for an electronic ballast, including a duty ratio controller that controls a duty ratio of a switch of the ballast, and means for adjusting the duty ratio accord-ing to a nonlinear function, so that an arc is sustained across the lamp. The controller and the ballast allow dimming of the fluores-cent lamp while maintaining a high power factor.

L'invention concerne un ballast électronique pour une lampe fluorescente, comprenant un redresseur pour convertir une tension d'entrée alternative en tension de sortie continue, et un circuit comprenant un étage de correction de facteur de puissance combinée (PFC) et un inverseur, l'étage PFC et l'inverseur partageant un commutateur. L'invention concerne également un contrôleur pour un ballast électronique, comprenant un contrôleur de facteur de marche contrôlant un facteur de marche d'un commutateur du ballast, et un moyen pour ajuster le facteur de marche selon une fonction non linéaire, de telle sorte qu'un arc soit soutenu sur la lampe. Le contrôleur et le ballast permettent la gradation de la lampe fluorescente tout en maintenant un facteur de puissance élevé.

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