Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1982-02-26
1986-02-25
Sikes, William L.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315209T, 315DIG7, H05B 3702, H05B 3904, H05B 4136
Patent
active
045729891
ABSTRACT:
To insure starting of an oscillatory circuit for fluorescent lamp operation scillating, for example, at about 35 kHz, two transistors are serially connected across the output of a rectifier adapted for connection to an a-c network, and the oscillatory circuit is additionally coupled to one of the a-c terminals of the rectifier, to apply to one of the transistors a triggering voltage which recurs with each undulation of the a-c network. The serially connected transistors each have an emitter resistor, which may be a PTC resistor, to balance currents through the transistors and eliminate unbalancing effects of manufacturing tolerances in the transistors. The PTC resistors additionally have current deviation regulating function. For multiple-lamp operation, oscillation control is derived from auxiliary windings on the ballast resistors and applied to the bases of the respective transistors (T1, T2) through an inductance network which insures spaced commutation or switching of the transistors and prevents overlap of conduction phases thereof.
REFERENCES:
patent: 3765391 (1973-10-01), Cook
patent: 4375608 (1983-03-01), Kohler
Patent-Treuhand Gesellschaft fur electrische Gluhlampen mbH
Sikes William L.
Wise Robert E.
LandOfFree
Rapid-start, low-pressure discharge lamp operating circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rapid-start, low-pressure discharge lamp operating circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rapid-start, low-pressure discharge lamp operating circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1013871