Circuit arrangement for operating at least one light source

Details Circuit arrangement for operating at least one light source Circuit arrangement for operating at least one light source

2006-12-26

2006-12-26

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Regulation of the control current and/or potential applied...

C315S20000A, C315S247000, C315S272000, C315S291000, C363S044000, C363S037000, C363S081000

Reexamination Certificate

active

07154227

ABSTRACT:
A circuit arrangement for operating at least one light source. Cost-effective power factor correction of the system input is achieved by a combination of a charge pump and a valley-fill circuit. According to the invention, the voltage (UN2) produced by the charge pump is fed into the valley-fill circuit with a lag, for example via an inductor (L2).

REFERENCES:
patent: 4949013 (1990-08-01), Zuchtriegel
patent: 5880564 (1999-03-01), Franck
patent: 5994847 (1999-11-01), Konopka
patent: 6316883 (2001-11-01), Cho et al.
patent: 2003/0071582 (2003-04-01), Zhang et al.
patent: 0 667 734 (1995-08-01), None
patent: WO 90/09087 (1990-08-01), None
patent: WO 02/47441 (2002-06-01), None
patent: WO 2004/028218 (2004-04-01), None
“Modified Valley Fill High Power Factor Electronic Ballast for Compact Fluoresent Lamps,” Mustansir H. Kheraluwala et al., IEEE Power Electronics Specialists Conference 1995, Jun. 1995, pp. 10-14.
“Improved Crest Factor of Electronic Ballast-Fed Fluorescent Lamp Current Using Pulse Frequency Modulation,” Jooho Song et al., IEEE Transactions on Industrial Electronics, vol. 48, No. 5, Oct. 2001, pp. 1015-1023.
Search Report from European Patent Office (for related foreign patent application) referencing the above-listed patent documents, dated Feb. 10, 2006 (8 pages total).

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