Fluorescent lamp ballast with high power factor

Details Fluorescent lamp ballast with high power factor Fluorescent lamp ballast with high power factor

1989-10-31

1991-04-02

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315244, 315247, H05B 4114

Patent

active

050049470

ABSTRACT:
In a power-line-operated electronic inverter-type ballast for a fluorescent lamp, a series-connected L-C circuit is connected directly across the otherwise unfiltered output of a full-wave rectifier that provides DC voltage to the inverter. This L-C circuit is tuned to series-resonance at 120 Hz, thereby effectively shorting-out the fundamental component of the 120 Hz ripple that otherwise would be present on the DC voltage. The result is a fairly well-filtered DC voltage obtained without the use of the conventional and often short-lived electrolytic capacitor. This particular method of reducing the amplitude of the ripple voltage results in a particularly high power factor in respect to the power drawn by the ballast from the power line.

REFERENCES:
patent: 3859542 (1975-01-01), Kennedy
patent: 3906337 (1975-09-01), Depenbrock
patent: 4277726 (1981-07-01), Burke
patent: 4587461 (1986-05-01), Hanlet
patent: 4609850 (1986-09-01), Hanlet

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