Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1998-10-15
2000-12-05
Vu, David
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315291, 315224, G05F 100
Patent
active
061571423
ABSTRACT:
A HID ballast includes a control circuit that minimizes arc instability associated with acoustic resonance of a lamp energized by the ballast. In one embodiment, the ballast includes an inverter circuit having first and second switching elements coupled in a half bridge configuration. A first control circuit controls the conduction state of the first switching element and a second control circuit controls the conduction state of the second switching element. The second control circuit includes a limiting circuit that limits the pre- and post-ignition energy levels to the lamp. One feature of the invention limits the lamp current amplitude such that the lamp can be driven while in acoustic resonance. In another embodiment, the inverter circuit includes a resonant inductive element and a resonant capacitive element which is coupled in parallel with the lamp. The resonant capacitive element has a temperature-dependent impedance characteristic so as to alter the resonant frequency of the inverter circuit as the circuit heats up prior to ignition of the lamp. As the resonant capacitive element heats up the resonant frequency of the inverter increases which increases a voltage applied to the lamp until an arc is initiated. Another feature of the invention limits the average voltage applied to the lamp before and after ignition. A further feature limits the voltage applied to the lamp on a cycle by cycle basis.
REFERENCES:
patent: 3732460 (1973-05-01), Wattenbach
patent: 3989976 (1976-11-01), Tabor
patent: 4103209 (1978-07-01), Elms
patent: 4107579 (1978-08-01), Bodine, Jr. et al.
patent: 4204141 (1980-05-01), Nuver
patent: 4287454 (1981-09-01), Feuersanger et al.
patent: 4331905 (1982-05-01), Owen
patent: 4339692 (1982-07-01), Lasecki et al.
patent: 4350935 (1982-09-01), Spira et al.
patent: 4356433 (1982-10-01), Linden
patent: 4373146 (1983-02-01), Bonazoli et al.
patent: 4378514 (1983-03-01), Collins
patent: 4414493 (1983-11-01), Henrich
patent: 4437043 (1984-03-01), Pitel
patent: 4455510 (1984-06-01), Lesko
patent: 4503364 (1985-03-01), Engel
patent: 4745341 (1988-05-01), Herres
patent: 4763044 (1988-08-01), Nuckolls et al.
patent: 4810936 (1989-03-01), Nuckolls et al.
patent: 4890041 (1989-12-01), Nuckolls et al.
patent: 4904903 (1990-02-01), Pacholok
patent: 4958107 (1990-09-01), Mattas et al.
patent: 4959593 (1990-09-01), Joanino
patent: 5003231 (1991-03-01), Perper
patent: 5036256 (1991-07-01), Garrison et al.
patent: 5051665 (1991-09-01), Garrison et al.
patent: 5084801 (1992-01-01), El-Hamamsy et al.
patent: 5118994 (1992-06-01), Byszewski et al.
patent: 5134345 (1992-07-01), El-Hamamsy et al.
patent: 5138231 (1992-08-01), Iida et al.
patent: 5225742 (1993-07-01), Beasley
patent: 5227762 (1993-07-01), Guidette et al.
patent: 5319285 (1994-06-01), Wang et al.
patent: 5321338 (1994-06-01), Nuckolls et al.
patent: 5339005 (1994-08-01), Byszewski et al.
patent: 5357173 (1994-10-01), Kachmarik et al.
patent: 5391966 (1995-02-01), Garrison
patent: 5424617 (1995-06-01), Garbowicz et al.
patent: 5428268 (1995-06-01), Melis et al.
patent: 5444334 (1995-08-01), Speaker et al.
patent: 5449980 (1995-09-01), Kiefer et al.
patent: 5569984 (1996-10-01), Holtslag
patent: 5572093 (1996-11-01), Kiefer
patent: 5594308 (1997-01-01), Nuckolls et al.
patent: 5606222 (1997-02-01), Cottaar et al.
patent: 5623187 (1997-04-01), Caldeira et al.
patent: 5677602 (1997-10-01), Paul et al.
patent: 5684367 (1997-11-01), Moskowitz et al.
patent: 5723951 (1998-03-01), Byszewski et al.
patent: 5925986 (1999-07-01), Moisin
patent: 5942860 (1999-08-01), Huynh
patent: 5962985 (1999-10-01), Buij et al.
Electro-Mag International, Inc.
Vo Tuyet T.
Vu David
LandOfFree
Hid ballast circuit with arc stabilization does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hid ballast circuit with arc stabilization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hid ballast circuit with arc stabilization will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-964491