Method of controlling cathode voltage with low lamp's arc...

H - Electricity – 05 – B

Patent

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Details

H05B 41/28 (2006.01) H05B 41/282 (2006.01) H05B 41/285 (2006.01) H05B 41/295 (2006.01) H05B 41/298 (2006.01)

Patent

CA 2592008

The embodiment disclosed herein relates to systems and methods to provide improvements to power delivery systems employed with lamps (114) in general and fluorescent lamps in particular. In accordance with one exemplary embodiment, cathode current is controlled to a maximum level to quickly bring the cathode temperature up to thermionic emission temperature. After lamp ignition, a cathode voltage reduction circuit is employed to reduce voltage of the external cathode heating. Power is supplied to a power factor correction circuit (106) via an IC (110), in accordance with a second exemplary embodiment. Finally, a third disclosed embodiment addresses desensitizing the lamp from various deleterious parasitic capacitive effects associated with the power delivery to one or more lamps (114).

Dans ce mode de réalisation, l'invention concerne des systèmes et des procédés qui améliorent des systèmes de distribution de puissance utilisés avec des lampes (114) en général et avec des lampes fluorescentes en particulier. Selon un mode de réalisation de l'invention, le courant cathodique est commandé à un niveau maximum de façon à rapidement faire monter la température cathodique à une température d'émission thermoïonique. Après l'allumage de la lampe, un circuit de réduction de tension cathodique est utilisée pour réduire la tension du chauffage de cathode externe. La puissance est alimentée à un circuit de correction de facteur de puissance(106) via an IC (110), conformément à un deuxième mode de réalisation de l'invention. Finalement, un troisième mode de réalisation d'invention s'occupe de désensibiliser la lampe de divers effets capacitifs parasites nocifs associés à la distribution de puissance à une ou plusieurs lampes (114).

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