Electronic ballasts for plural lamp fluorescent lighting without

Details Electronic ballasts for plural lamp fluorescent lighting without Electronic ballasts for plural lamp fluorescent lighting without

1997-07-01

1998-10-20

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315200R, 315224, 315DIG4, H05B 3702

Patent

active

058251375

ABSTRACT:
A non-dimmable 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 provide power for either two or four fluorescent lamps and has additional safety and protection features which are not available in existing ballasts. A dimmable version is also disclosed with a dimming control at the ballast or which can operate a bank of ballasts with a central, remote dimming control or which can provide a variable output frequency to the ballasts to dim the lamps. 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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