High efficiency ballast system for gaseous discharge lamps

Details High efficiency ballast system for gaseous discharge lamps High efficiency ballast system for gaseous discharge lamps

1978-05-02

1980-01-22

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Plural series connected load devices

Discharge device loads

315 97, 315188, 315232, 315245, 315254, 315324, H05B 4116, H05B 41232

Patent

active

041852311

ABSTRACT:
Electrical lamp ballast system for starting and operating fluorescent lamps with improved efficiency and safety. System includes high leakage reactance autotransformer having primary and secondary windings, and a ballast capacitor connected in series with the secondary winding and two serially connected fluorescent lamps of low starting and operating voltage, the secondary circuit being connected to a tap on the primary winding for reducing the ratio of the ballast power input to the lamp light output. A starting capacitor connected across one of the lamps has a resistor of predetermined resistance connected in shunt therewith to reduce the peak voltage to ground resulting from removal of that lamp from the circuit, so that electrical shock hazard to service personnel is minimized.

REFERENCES:
patent: 2965799 (1960-12-01), Brooks et al.
patent: 2965808 (1960-12-01), Lovinger
patent: 3225255 (1965-12-01), Hume

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