Lamp filament drive scheme providing for control of filament vol

Details Lamp filament drive scheme providing for control of filament vol Lamp filament drive scheme providing for control of filament vol

1980-12-29

1983-08-02

La Roche, Eugene

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315 97, 315220, 315278, 315DIG7, H05B 4114, H05B 4129

Patent

active

043968660

ABSTRACT:
An output configuration for an electronic ballast system includes means for effecting independent selection of both pre- and post-ignition lamp filament voltages. The primary of a filament voltage control transformer is coupled to lamp filaments so as to induce a voltage in the transformer secondary windings in relation to the lamp filament current. The secondary windings are arranged so that the voltage induced therein adds to the voltage provided to the lamp filaments by filament drive windings on the ballast output transformer.

REFERENCES:
patent: 4188661 (1980-02-01), Bower et al.

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