Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2007-11-20
2007-11-20
Dinh, Trinh (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S360000
Reexamination Certificate
active
11102603
ABSTRACT:
The IRS21681D is a fully integrated, fully protected 600V ballast control IC designed to drive all types of fluorescent lamps. The IRS21681D is based on the popular IR2166 control IC with additional improvements to increase ballast performance. PFC circuitry operates in critical conduction mode and provides high PF, low THD and DC bus regulation. The IRS21681D features include programmable preheat and run frequencies, programmable preheat time, programmable ignition ramp, programmable PFC over-current protection, and programmable end-of-life protection. Comprehensive protection features such as protection from failure of a lamp to strike, filament failures, end-of-life protection, DC bus under-voltage reset as well as an automatic restart function, have been included in the design. The IRS2168D has, in addition, closed-loop half-bridge ignition current regulation and a novel fault counter. The IRS21681D, unlike the IRS2168D, ramps up during ignition and shuts down at the first over-current fault. The IRS21681D and IRS2168D are both available in either 16-pin PDIP or 16-pin narrow body SOIC packages.
REFERENCES:
patent: 6008593 (1999-12-01), Ribarich
patent: 2002/0047635 (2002-04-01), Ribarich et al.
patent: 2004/0113569 (2004-06-01), Henry
patent: 2005/0156534 (2005-07-01), Oh
patent: 1 395 095 (2004-03-01), None
patent: 2004/006630 (2004-01-01), None
U.K. Office Action in corresponding U.K. Application No. GB0621355.7 issued Feb. 23, 2007.
Dinh Trinh
Duong Dieu Hien T
International Rectifier Corporation
Ostrolenk Faber Gerb & Soffen, LLP
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