Low cost compact size single stage high power factor circuit...

Electric lamp and discharge devices: systems – Current and/or voltage regulation – Plural load device regulation

Reexamination Certificate

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C315S224000, C315S20000A, C315S201000

Reexamination Certificate

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07923941

ABSTRACT:
The present application claims a compact low cost topology solution of a ballast for a discharge lamp that can provide both high power factor and low total harmonic distortion with fewer components than prior art. The topology provides the feature of a low crest factor and quick start that increase both the lamp life and the number of starts for the product. By using Bipolar Junction Transistor instead of Field Effect Transistor as the main switches and also a lower value electrolytic, the cost and size are considerably reduced.

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patent: 5691606 (1997-11-01), Moisin et al.
patent: 5898278 (1999-04-01), Muessli
patent: 5955841 (1999-09-01), Moisin et al.
patent: 5982107 (1999-11-01), Muessli
patent: 5994847 (1999-11-01), Konopka
patent: 6169274 (2001-01-01), Chang
patent: 6348767 (2002-02-01), Chen et al.
patent: 0 697 803 (1996-02-01), None
PCT/US2009/056891 Search Report, mailed Dec. 2, 2009.

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