Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Plural cathodes or heaters in the load device
Patent
1984-10-03
1987-03-10
Dixon, Harold
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Plural cathodes or heaters in the load device
315101, 315103, 315105, 315345, H05B 3900
Patent
active
046493190
ABSTRACT:
A starter circuit for use with a fluorescent lamp includes an inductor coupled in series with the lamp electrodes and a semiconductor bilateral trigger, such as a Sidac, connected between the lamp electrodes. The semiconductor bilateral switch is selected to conduct electricity at a value below the instantaneous peak voltage applied and to cease conduction at a level above the operating voltage of the lamp. When the voltage reaches the predetermined level at which the semiconductor switch turns on, current is conducted through the electrode and the bilateral trigger. When the bilateral switch turns off, a large voltage pulse is generated in the inductor which voltage pulse appears at one of the lamp electrodes. A voltage potential is therefore set up across the electrodes to the lamp fixture which is grounded ionizing ionizable material, for example, mercury, within the lamp. The ionization of the material in the vicinity of the electrode permits the lamp to start, thus, the voltage appearing across the bilateral trigger falls below the level needed to trigger the switch on. The bilateral trigger has no further effect on lamp operation until the lamp is restarted.
REFERENCES:
patent: 2512280 (1950-06-01), Lemmers
patent: 3705329 (1972-12-01), Vogeli
patent: 4015167 (1977-03-01), Samuels
patent: 4410836 (1983-10-01), Roche
patent: 4460848 (1984-07-01), Fahnrich
patent: 4494041 (1985-01-01), Roche
Dixon Harold
Duro-Test Corporation
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