Electronic ballast for tungsten lamp tubes

Details Electronic ballast for tungsten lamp tubes Electronic ballast for tungsten lamp tubes

1988-10-25

1990-07-03

Pascal, Robert J.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Discharge device and/or rectifier in the cathode or heater...

315DIG7, H05B 4114

Patent

active

049394223

ABSTRACT:
An electronic ballast for tungsten lamp tubes is operable even when one of the tungsten lamp filaments is broken or missing. The transformer negative feedback oscillator which drives the tungsten filaments includes parallel connection to one of the filaments through a resistor of one of the filaments and parallel connection to the other filament through a tuning circuit to make the circuit operable when one of the filaments is broken or missing. The tuning circuit, in addition to providing a closed circuit when one of the tungsten filaments is missing, also enables the intensity of the light to be adjusted.

REFERENCES:
patent: 3700956 (1972-10-01), Cluett

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