Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1990-04-12
1990-11-20
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315224, 315DIG5, 315DIG7, H05B 3702
Patent
active
049721240
ABSTRACT:
A current fed half-bridge parallel resonant inverter for powering one or more discharge-type lamps is comprised of a bifilar wound current feed choke placed in series with a transformer whose secondary resonates with a capacitance placed across the secondary. The bifilar current feed choke is connected in such a way as to insure that that current flows through alternate windings on alternate half cycles of the inverter. Each half of the primary circuit is comprised of one winding of the current feed choke, transformer primary winding, and a switch such as a transistor or the like. An inherent feature of the half-bridge design is that the two halves of the primary circuit operate at different DC offsets. A means is provided for alternately switching the switches of each half of the primary circuit on and off through additional windings of the transformer. A further winding is provided on the transformer to detect lamp ignition through detection of the frequency shift of the inverter caused as current through the lamp after ignition begins to flow through the reactive current limiting element in series with the lamp.
REFERENCES:
patent: 4060752 (1977-11-01), Walker
patent: 4127795 (1978-11-01), Knoll
patent: 4199710 (1980-04-01), Knoll
patent: 4237403 (1980-12-01), Davis
patent: 4245177 (1981-01-01), Schmitz
patent: 4259614 (1981-03-01), Kohler
patent: 4259616 (1981-03-01), Smith
patent: 4277726 (1981-07-01), Burke
patent: 4277728 (1981-07-01), Stevens
patent: 4469988 (1984-09-01), Cronin
patent: 4513226 (1985-04-01), Josephson
LandOfFree
Electronic ballast inverter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electronic ballast inverter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic ballast inverter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-455807