Single chip ballast control with power factor correction

Details Single chip ballast control with power factor correction Single chip ballast control with power factor correction

2005-10-18

2005-10-18

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S224000, C315S291000

Reexamination Certificate

active

06956336

ABSTRACT:
An integrated circuit provides a complete electronic ballast control with power factor correction for fluorescent lamps. The integrated circuit contains a simplified power factor correction (PFC) circuit to reduce component count and supply voltage requirements to reduce manufacturing costs while providing a robust control. The PFC circuit has a variable gain for fast response at high gain and optimized power factor control at low gain. An increased on time for the PFC switch when the input line voltage approaches zero dynamically reduces crossover distortion, thereby reducing total harmonic distortion. The integrated circuit incorporates a number of fault protections.

REFERENCES:
patent: 5315214 (1994-05-01), Lesea
patent: 5612597 (1997-03-01), Wood
patent: 6008593 (1999-12-01), Ribarich
patent: 6211623 (2001-04-01), Wilhelm et al.
patent: 6259614 (2001-07-01), Ribarich et al.
patent: 6469917 (2002-10-01), Ben-Yaakov
patent: 6555971 (2003-04-01), Lestician
patent: 6617805 (2003-09-01), Ribarich et al.
patent: 2002/0141129 (2002-10-01), Ribarich

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