Starter circuit for a fluorescent tube lamp

Details Starter circuit for a fluorescent tube lamp Starter circuit for a fluorescent tube lamp

1984-02-29

1986-12-16

Dixon, Harold

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Discharge device and/or rectifier in shunt to the load device

315101, 315103, 315105, H05B 3700

Patent

active

046299440

ABSTRACT:
A starter circuit for a fluorescent tube lamp is connected between the cathode heaters of the tube to provide an initial heating current and then changes to a high impedance to ignite the tube. The circuit is fed by raw rectified a.c. and has a main thyristor requiring a high holding current to maintain the initial conduction. The current through the main thyristor sets up a voltage across a series diode which triggers a second thyristor to reduce the gate voltage of the main thyristor. The main thyristor ceases conduction when the current falls below the holding value and the inductive ballast impedance then produces a high energy striking pulse for the tube. The pulse voltage is limited to increase its duration. One embodiment generates a single pulse only each time the circuit is switched on and another embodiment produces pulses for a period of time before becoming quiescent. The main thyristor and the voltage limiting means are embodied in a monolithic semiconductor structure.

REFERENCES:
patent: 3569776 (1971-03-01), Moerkens et al.
patent: 3643127 (1972-02-01), Laupman
patent: 3822409 (1974-07-01), Abe
patent: 3942070 (1976-03-01), Tomura et al.
patent: 3978368 (1976-08-01), Tomura et al.
patent: 4227118 (1980-10-01), Britton
patent: 4380719 (1983-04-01), DeBijl et al.

Affiliated with

Also associated with

Rating

Starter circuit for a fluorescent tube lamp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Starter circuit for a fluorescent tube lamp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Starter circuit for a fluorescent tube lamp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-246616