Method for operating fluorescent lamps and ballast

Details Method for operating fluorescent lamps and ballast Method for operating fluorescent lamps and ballast

2005-08-23

2005-08-23

Tran, Thuy V. (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S291000, C315S307000, C315S360000

Reexamination Certificate

active

06933682

ABSTRACT:
The invention relates to an operating method for fluorescent lamps and a corresponding ballast, in which the brightness of the fluorescent lamps (LP) is set to the desired value by varying the switching frequency of the inverter switches (T1, T2). In order to prevent oscillations between different operating states in a critical dimming range, the power consumption of the fluorescent lamps (LP) is stabilized according to the invention by way of an additional control loop.

REFERENCES:
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patent: 5066894 (1991-11-01), Klier
patent: 5798620 (1998-08-01), Wacyk et al.
patent: 6040661 (2000-03-01), Bogdan
patent: 6414449 (2002-07-01), Hui et al.
patent: 6424100 (2002-07-01), Kominami et al.
patent: 6605905 (2003-08-01), Kosa et al.
patent: 0 287 360 (1988-10-01), None
patent: 0 529 901 (1993-03-01), None
Copy of Search Report (5 pages) for corresponding European application; search report was issued by the European Patent Office on Jan. 19, 2004.

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