Cold-cathode tube operating apparatus

Details Cold-cathode tube operating apparatus Cold-cathode tube operating apparatus

2006-04-25

2006-04-25

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S360000, C315S287000

Reexamination Certificate

active

07034471

ABSTRACT:
The present invention can provide a cold cathode tube lighting apparatus capable of causing no pulsating current, intermittent oscillation, or flicker-off even under light load, stably keeping a cold cathode tube lighting, safely tuning on the same, and the like. The present invention is characterized by supplying a rectangular wave voltage Vs to a series resonance circuit12and by driving the cold cathode tube8with an output of the series resonance circuit. The series resonance circuit has a constant that makes a maximum output voltage with respect to a predetermined tube current value exceed a tube voltage VLof the cold cathode tube when the cold cathode tube is turned on and in an operating load range of the cold cathode tube of negative resistance characteristic. A control circuit15controls a cold cathode tube current ILto a predetermined value while the cold cathode tube is in a lit state. At black start of the cold cathode tube, the control circuit prevents a tube voltage of the cold cathode tube from exceeding a predetermined voltage until the cold cathode tube is turned on.

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