Power control of a fluorescent lamp

Details Power control of a fluorescent lamp Power control of a fluorescent lamp

2005-07-27

2008-09-30

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S291000, C315S307000, C315S297000, C315S225000

Reexamination Certificate

active

07429830

ABSTRACT:
A fluorescent lamp (2), in particular a backlight lamp of a display device, is supplied with an alternating voltage, a frequency and an amplitude of which being greater during ignition than during normal operation of the lamp. The voltage (V) across the lamp and the current (I) through the lamp are measured to provide a measured voltage value and a measured real lamp current value. From the alternating voltage there is derived a voltage (V2). The measured voltage value is multiplied by the sum of the measured real lamp current value and the derived voltage. The multiplication result (P=V*(I+V2)) is compared with a reference value (Ref), which results in a difference or error value. The error value is used to control the frequency and the amplitude of the alternating voltage (V), such that the error value is minimized.

REFERENCES:
patent: 5670849 (1997-09-01), Melai
patent: 5770926 (1998-06-01), Choi et al.
patent: 6011360 (2000-01-01), Gradzki et al.
patent: 2002/0101187 (2002-08-01), Buji et al.
patent: 2003/0160576 (2003-08-01), Suzuki
patent: 0237904 (2002-05-01), None

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