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

Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device

Reexamination Certificate

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Details

C315S105000, C315S247000, C315S291000

Reexamination Certificate

active

07420336

ABSTRACT:
The embodiment disclosed herein relates to systems and methods to provide improvements to power delivery systems employed with lamps 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 via an IC, 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.

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