Circuit for transistor ballasts for the gentle ignition of fluor

Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Delayed application of the discharge potential

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315104, 315278, H05B 4114, H05B 4126

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042141869

ABSTRACT:
A ballast circuit for controlling the ignition characteristics of a preheat type fluorescent lamp of the type having a transformer with a primary, operating secondary, filament and auxiliary ignition windings, in which there is provided a rectifier having A.C. input terminals, one connected to an end of the operating winding and the other connected to an end of the auxiliary ignition winding by a resistor, and a pair of D.C. output terminals across which is connected a resistive ballast. A starting capacitor is connected to the junction of the resistor and the rectifier A.C. input terminal and applies the auxiliary starting voltage after a time delay. A second capacitor, connected in the lamp running circuit, is charged through a resistor and diode and makes an additional voltage available.

REFERENCES:
patent: 3599051 (1971-08-01), Lee
patent: 3866087 (1975-02-01), Powell
patent: 3975660 (1976-08-01), Knobel et al.

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