Starter circuit for a fluorescent tube lamp

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

1985-09-30

1987-06-16

Dixon, Harold

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

315101, 315207, 357 38, 357 46, 357 86, H05B 3700

Patent

active

046738444

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: 3265909 (1966-08-01), Gentry
patent: 3337783 (1967-08-01), Stehney
patent: 3643127 (1972-02-01), Laupman
patent: 3693054 (1972-09-01), Anderson
patent: 3725752 (1973-04-01), Garrett
patent: 3942070 (1976-03-01), Tomura et al.
patent: 4119887 (1978-10-01), Iyama et al.
patent: 4315274 (1982-02-01), Fukui et al.

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