Apparatus for detecting open status of lamp in LCD backlight with parallel running type

摘要

The information disclosed relates to a parallel drive system on the open lamp detection device employing the LCD backlight, resulting in a large number of the lamp; A control unit for performing a switching control for driving the lamp; And a switching unit for switching the input power applied to the driving of the lamp according to the control signal input from the controller; Converting the power input through the switching unit to drive the lamp at a high pressure of the AC voltage to supply to the lamp, and the coil in addition to the primary side of the transformer is provided within the winding, and wound additionally on the primary side of the transformer and high voltage generation unit for detecting a change in the duty signal for the damaged or opened during the lamp through the coil; Rectifying and filtering through a parallel-connected inductor and capacitor in the lamp status detection signal of the duty signal to be input is changed from the high-pressure generating section; Rectified through the rectifying, filtering the detector for outputting a feedback signal for comparison with the lamp of the state detection signal and not to be made based on at least the high-voltage output control unit is set in the high-pressure generating section if compared to the reference voltage the lamp is broken or open input is configured to include, in the high-pressure generating part according to the feedback signal input from the detection section compares the controller generates an AC voltage of high voltage to generate a switching control signal to be supplied to the lamp so as to output to the switching. ; Accordingly, the present invention can contribute to quality improvement in a smooth initial operation of the backlight at a low temperature state, because you do not directly use the output of the high pressure to remove the anomalies during the normal operation of the device is directly connected to the high voltage output terminal and, the use possible regardless of the type of lamp as well as minimizing the damage applied to the lamp, and can extend the life of the backlight maintained largely, depending on the characteristics of the lamp is badly difference I a detection accuracy of the lamp by reducing the variation provides an effect that could talk.