Self ballasted fluorescent lamp and lighting fixture

Details Self ballasted fluorescent lamp and lighting fixture Self ballasted fluorescent lamp and lighting fixture

1999-03-31

2000-08-22

Vu, David H.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315200R, 315291, H05B 3702

Patent

active

06107747&

ABSTRACT:
A self ballasted fluorescent lamp includes a rectifier which full wave rectifies AC power from a commercial source. A smoothing capacitor smoothes the rectified power. The smoothed, rectified power is provided to a high frequency generating circuit which drives the fluorescent lamp. The capacitance value C of the smoothing capacitor is selected such that W.gtoreq..alpha.C, where W (in watts)is the rated service power of the fluorescent lamp, and .alpha. is related to a ratio of W to C0 (in .mu.F). C0 is a capacitance value of the smoothing capacitor for which the 5th harmonic component of the input current is 61% of the fundamental component of the input current when the fluorescent lamp operates under fixed conditions. When the above condition is met, the percentage of harmonic content falls within IEC standards, etc.

REFERENCES:
patent: 5343122 (1994-08-01), Sugimori et al.

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