Fluorescent lamp electrode disconnect arrangement

Details Fluorescent lamp electrode disconnect arrangement Fluorescent lamp electrode disconnect arrangement

1991-08-30

1993-09-07

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315 97, 315 98, 315101, 315105, 315DIG5, H05B 4136

Patent

active

052432580

ABSTRACT:
A fluorescent lamp system including a ballast with primary and secondary windings and a switch for each of the plurality of electrodes of the lamp system. Each switch is operable in response to the voltage across its associated lamp after its associated lamp turns on to interrupt the connection of an associated electrode to its associated heater winding, and wherein at least two of the plurality of switches conduct current which flows through a semiconductor conducting device before the lamps turn on.

REFERENCES:
patent: 3904921 (1975-09-01), Imaizumi et al.
patent: 4010399 (1977-03-01), Bessone et al.
patent: 4145638 (1979-03-01), Kaneda
patent: 4339690 (1982-07-01), Regan et al.
patent: 4399391 (1983-08-01), Hammer et al.
patent: 4661745 (1987-04-01), Citino et al.
patent: 4947086 (1990-04-01), Nagano
patent: 4954749 (1990-09-01), Crawford
patent: 5013970 (1991-05-01), Crawford

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