Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Discharge device and/or rectifier in the cathode or heater...
Patent
1975-12-22
1977-03-01
La Roche, Eugene R.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Discharge device and/or rectifier in the cathode or heater...
315 73, 315 97, 315 98, 315106, 315119, H05B 4123
Patent
active
040103994
ABSTRACT:
A ballast for a rapid start fluorescent lamp with heated filaments has a secondary winding supplying lamp current, tertiary windings for supplying heater current to the filaments, and solid state switching circuits in secondary circuits through the filaments. Each switching circuit, which may be integrated with the ballast circuit or connected to a filament within the lamp envelope, comprises two voltage divider resistors having a common junction coupled to the gate of a triac whose primary electrodes are connected in parallel with the voltage divider. The triac is in series with the filament and supplies heating current to the filaments prior to lamp starting. When the lamp starts and conducts rated operating current the voltage divider reduces the voltage at its junction and at the triac gate below triac breakdown level thereby substantially eliminating heater current. BACKGROUND OF THE INVENTION
REFERENCES:
patent: 2317602 (1943-04-01), Hall, Jr. et al.
patent: 2330312 (1943-09-01), Raney, Jr.
patent: 3668259 (1954-02-01), Stutsman
Bessone Carlo S.
Latassa Frank M.
Grover James H.
GTE Sylvania Incorporated
La Roche Eugene R.
LandOfFree
Switching circuit for a fluorescent lamp with heated filaments does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switching circuit for a fluorescent lamp with heated filaments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switching circuit for a fluorescent lamp with heated filaments will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1354563