Ballast circuit for a 220-volt improved lighting unit

Details Ballast circuit for a 220-volt improved lighting unit Ballast circuit for a 220-volt improved lighting unit

1983-04-26

1985-01-15

Moore, David K.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315198, 315207, 315273, H05B 4116, H05B 4124

Patent

active

044940459

ABSTRACT:
A ballast circuit for developing a predetermined desired D.C. voltage to enhance the operation of a gas discharge tube in a lighting unit of the type which also comprises an incandescent filament is disclosed. The ballast circuit operates from an applied 220 volt, 50 Hz alternating current (A.C.) source. The ballast circuit has an input stage comprised of a resistive capacitive network. The resistive capacitive network has values selected so as to reduce the applied 220 volt, 50 Hz excitation to a desired range for further development by the ballast circuit in providing a desired D.C. operational voltage for the gas discharge tube. Further, the ballast circuit provides means to prevent circuit malfunctions due to sudden changes in the applied A.C. source voltage. Still further, the ballast circuit provides a desired power factor operation of the gas discharge tube.

REFERENCES:
patent: 4320325 (1982-03-01), Anderson
patent: 4350930 (1982-09-01), Peil et al.

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