Push-pull fluorescent dimming circuit

Details Push-pull fluorescent dimming circuit Push-pull fluorescent dimming circuit

1988-04-27

1990-04-24

Laroche, Eugene R.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Plural cathodes or heaters in the load device

315222, 315219, 315105, 315DIG5, H05B 4114

Patent

active

049202995

ABSTRACT:
A diming circuit for a hot cathode fluorescent lamp is operated in a push-pull mode whereby the hot filaments are alternately the cathode and the anode. Both filaments thus experience similar degradation with time at all brightness levels, thereby enhancing and lengthening the life of the lamp.

REFERENCES:
patent: 1844375 (1932-02-01), Wiegand et al.
patent: 1951294 (1934-03-01), Greeff
patent: 2008514 (1935-07-01), Peterson
patent: 2294623 (1942-09-01), Lebrun
patent: 4327309 (1982-04-01), Wallot
patent: 4395659 (1983-07-01), Aoike et al.
patent: 4716342 (1987-12-01), McCaffrey
patent: 4791338 (1988-12-01), Dean et al.

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