Electronic ballast

Details Electronic ballast Electronic ballast

1990-10-03

1991-11-19

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315209R, 315244, 315287, 315307, H05B 3702

Patent

active

050668943

ABSTRACT:
In electronic ballast having inverter rectifiers for fluorescent lamps, a regulation of the lamp current or of the lamp power is usually used in order to stabilize the lighting current independently of tolerances of the electrical properties of the fluorescent lamp or their aging phenomena. When such a regulation is simultaneously utilized for dimming the fluorescent lamp, difficulties arise at the lower limit of the dimming range at, for example, 1% of the nominal light power. The range of brightness at the lower limit is regulated on the basis of an additional regulation, dependent on the discharge resistance of the fluorescent lamp. An auxiliary measured quantity resulting therefrom is superimposed on the actuating quantity of the regulator that results from a reference/actual value comparison of the current or power regulation for the purpose of stabilizing the lamp current.

REFERENCES:
patent: 3989796 (1976-11-01), Tabor
patent: 3999100 (1976-12-01), Dendy et al.
patent: 4628230 (1986-12-01), Krokaugger
patent: 4959591 (1990-09-01), Hirschmann

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