Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Patent
1980-11-26
1982-09-21
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
315106, 315199, 315224, 315282, 315291, 315DIG4, H05B 4116, H05B 4139
Patent
active
043509339
ABSTRACT:
A two-wire ballast arrangement for fluorescent lamp dimming is disclosed in which a modified transformer utilizing the natural leakage inductance associated with ballast transformers is used to achieve full-range fluorescent tube dimming at substantially constant filament heating voltage. Additional auxiliary secondary windings are disposed in predetermined spaced relationship to the primary winding and the main secondary winding to create a "tapping" effect in the magnetic flux. The mutual leakage inductances of the auxiliary secondaries in relation to the primary and the main secondary is utilized in a manner such that as the voltage is decreased to the primary, the voltage of the auxiliary secondary windings remains substantially constant to hold the filament heating voltage substantially constant. Embodiments are disclosed for use either with conventional 50/60 Hz or at high frequency, i.e. above 400 Hz.
REFERENCES:
patent: 2940008 (1960-06-01), Strecker
patent: 3247422 (1966-04-01), Schultz
patent: 3969652 (1976-07-01), Herzog
patent: 4017762 (1977-04-01), Wheeler
patent: 4042852 (1977-08-01), Zaderes et al.
patent: 4100476 (1978-07-01), Ghiringhelli
patent: 4163925 (1979-08-01), Gyursanszky
patent: 4207497 (1980-06-01), Capewell et al.
patent: 4207498 (1980-06-01), Spira
patent: 4210846 (1980-07-01), Capewell et al.
Cohen, Charles, "Transistor Ballast Cuts Power Loss", Electronics, Sep. 13, 1979, pp. 78, 80.
Haver, Robert J., "The ABC's of DC to AC Inverters", Motorola Semiconductor Products, Inc., Apr. 1975.
Roddam, Thomas, "Transistor Inverters and Converters", Chapter 10 of Design of Solid State Power Supplies, date unknown, Princeton, N.J.
Haver, Robert J., "The Verdict Is In: Solid-State Fluorescent Ballasts are Here", EDN, Nov. 15, 1976.
Agarwala Poonam
Zansky Zoltan
Honeywell Inc.
La Roche Eugene R.
Mersereau Charles G.
LandOfFree
Two-wire ballast for fluorescent tube dimming does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Two-wire ballast for fluorescent tube dimming, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-wire ballast for fluorescent tube dimming will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2078073