Ballast circuit for fluorescent lamp

Details Ballast circuit for fluorescent lamp Ballast circuit for fluorescent lamp

1996-12-18

1999-11-02

Kinkead, Arnold

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315DIG5, 315DIG7, 315209R, H05B 3702

Patent

active

059777230

ABSTRACT:
A ballast circuit for a fluorescent lamp for starting the fluorescent lamp and a compact fluorescent lamp is provided. The ballast circuit adopts a bypass capacitor which bypasses a high frequency and high harmonics to a smoothing portion for compensating a recovery characteristic of a rectification diode which causes a problem by feeding back high frequency currents (most of them are I.sub.L) which flow during the ignition of a lamp to a power source input, and including a high frequency component much included in a rectifying and smoothing operation. Thus, a power factor increases 95% or more.

REFERENCES:
patent: 4647817 (1987-03-01), Fahnrich et al.
patent: 5223767 (1993-06-01), Kulka

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