Dimmable and non-dimmable electronic ballast for plural fluoresc

Details Dimmable and non-dimmable electronic ballast for plural fluoresc Dimmable and non-dimmable electronic ballast for plural fluoresc

1999-04-29

2000-08-08

Vu, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315224, 315276, H05B 3700

Patent

active

061006440

ABSTRACT:
An electronic ballast has a unique inverter design which eliminates a large percentage of the required components, thereby simplifying and increasing the reliability of the ballast, while decreasing its costs. The ballast can operate both as a non-dimmable ballast and a dimmable ballast. The ballast can provide power for either two or four fluorescent lamps in a single light fixture, or for a plurality of such light fixtures connected in a daisy chain fashion. The ballast incorporates additional safety and protection features which are not available in existing ballasts, such removing the lethal danger of the 50/60 Hz power that is typically present at the lamps during lamp replacement. Furthermore, the electronic ballast supplies a constant high frequency output voltage to the light fixture independent of the frequency. There is very little distributed capacitance at the connections from the electronic ballast to the lamps. This feature eliminates points of resonances over the range of frequencies for dimming, thereby eliminating sudden changes in brightness as the frequency is varied.

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