Electronic ballast and method for operating an electric lamp

Details Electronic ballast and method for operating an electric lamp Electronic ballast and method for operating an electric lamp

2011-01-04

2011-01-04

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S309000

Reexamination Certificate

active

07863830

ABSTRACT:
The invention relates to an electronic ballast device for operating an electric lamp (2), comprising a first (21) and a second lamp filament (22), wherein the lamp filaments (21, 22) are electrically connected to a heating circuit (3) during a pre-warming phase for the electric lamp (2) said heating circuit (3) being of such a form that the heating current generated by the heating circuit (3) during an operational phase of the electric lamp (2) amounts to between 20% and 60% of the lamp current of said electric lamp (2). The invention further relates to a method for operation of an electric lamp with an electronic ballast device.

REFERENCES:
patent: 5668446 (1997-09-01), Baker
patent: 6348769 (2002-02-01), Pinchuk et al.
patent: 6943502 (2005-09-01), Yamanaka et al.
patent: 7279853 (2007-10-01), Chong
patent: 2002/0011791 (2002-01-01), Nakagawa et al.
patent: 199 61 102 (2000-07-01), None
patent: 2 337 644 (1999-11-01), None

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