Cold cathode tube lighting device and driving method and...

Details Cold cathode tube lighting device and driving method and... Cold cathode tube lighting device and driving method and...

2008-05-13

2008-05-13

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S246000, C315S277000, C315S308000, C315S309000

Reexamination Certificate

active

07372211

ABSTRACT:
A cold cathode tube lighting device is provided which is capable of obtaining stable luminance when a cold cathode tube is driven by applying voltages to input terminals on both ends of the cold cathode tube. A first current flowing through each of transformer secondary sides of transformers is detected by a tube current detecting circuit from a low-voltage side of each of the transformer secondary sides and a second current flowing through each of resonance capacitors is detected by the tube current detecting circuit and a difference between the first current and the second current is calculated for every separately-excited inverter and, based on the difference, a tube current of the cold cathode tube is obtained and frequencies of driving pulse voltages are changed by a voltage controlling oscillator for setting so that the tube current maintains a predetermined value.

REFERENCES:
patent: 7166969 (2007-01-01), Kohno
patent: 2005/0146291 (2005-07-01), Lee
patent: 11-204277 (1999-07-01), None
patent: 2002-017090 (2002-01-01), None
patent: 2003-168584 (2003-06-01), None
patent: 2003-324962 (2003-11-01), None

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