Dimmable fluorescent lamp ballast

Details Dimmable fluorescent lamp ballast Dimmable fluorescent lamp ballast

1992-05-21

1993-05-25

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315200R, 315226, H05B 4129

Patent

active

052143562

ABSTRACT:
An electronic ballast is connected with the power line voltage of an ordinary electric utility power line and has an inverter functional to provide a high-frequency output voltage to a current-limiting circuit connected with a fluorescent lamp. The inverter includes a transistor whose collector-emitter is of trapezoidal waveform. Collector current flows through the transistor only during periods when the absolute magnitude of the transistor's collector-emitter voltage is very low compared with the maximum absolute magnitude of the collector-emitter voltage.

REFERENCES:
patent: 3233148 (1966-02-01), Lake
patent: 3353062 (1967-11-01), Nuckolls
patent: 3450972 (1969-06-01), Linkroam
patent: 3657598 (1972-04-01), Nomura et al.
patent: 3775702 (1973-11-01), Wallace
patent: 4277728 (1981-07-01), Stevens
patent: 4511195 (1985-04-01), Barter
patent: 4652797 (1987-03-01), Nilssen
patent: 4698554 (1987-10-01), Stupp et al.
patent: 4914356 (1990-04-01), Cockram

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