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Power supply system for cold cathode tube and light tube start method

A technology of a power supply system and a cold cathode tube, which is applied in the directions of electric light sources, light sources, electrical components, etc., can solve the problems of the power supply system 100 stopping working, the working cycle of the cold cathode tube exceeding the limit, etc.

Active Publication Date: 2008-02-20
QISDA CORP
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AI Technical Summary

Problems solved by technology

[0006] However, in the process of converting the operating voltage to the operating voltage, if the control is improper, between the time points t1 and t2, when the lighting signal S ON When it acts simultaneously with the brightness adjustment signal Sba, the duty cycle of the cold-cathode tube power supply system 100 will exceed the limit, thereby causing the cold-cathode tube power supply system 100 to stop working

Method used

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  • Power supply system for cold cathode tube and light tube start method
  • Power supply system for cold cathode tube and light tube start method
  • Power supply system for cold cathode tube and light tube start method

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Embodiment Construction

[0016] Please refer to FIG. 2 , which is a circuit block diagram of a cold cathode tube power supply system according to a preferred embodiment of the present invention. The cold cathode tube power supply system 200 includes a brightness adjustment unit 220 , a control circuit 230 , a voltage converter 240 and a brightness control unit 250 . The brightness adjustment unit 220 is used to output the brightness adjustment signal Sba, the brightness adjustment signal Sba is transmitted to the control circuit 230 through the brightness control unit 250, and the brightness control unit 250 also receives the lighting signal S ON .

[0017] Please refer to Fig. 3B at the same time, which shows the lighting signal S of the preferred embodiment of the present invention ON and the waveform diagram of the brightness adjustment signal Sba. The brightness adjustment signal Sba includes a lower brightness signal and a higher brightness signal, that is, a first brightness signal S1 and a se...

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Abstract

The utility model relates to a power supply system of a cold cathode tube, comprising a brightness control unit, a brightness adjustment unit, a control circuit and a voltage converter. The brightness control unit is used to receive lighting signals and output a first brightness signal within predetermined time period. The brightness adjustment unit outputs a second brightness signal according to input of the users. The control circuit outputs power control signals according to the first brightness signal and the second brightness signal. The voltage converter outputs AC voltage to drive a lamp tube according to power control signals; wherein, within preset time period, the control circuit outputs power control signals according to the first brightness signal; after the preset time period, the control circuit outputs power control signals according to the second brightness signal.

Description

technical field [0001] The invention relates to a power supply system of a cold-cathode tube and a starting method of a lamp, and in particular to a power supply system of a cold-cathode tube and a starting method of the lamp, which prevent the lamp from exceeding the working load. Background technique [0002] With the advent of the digital age and the popularization of computer networks, flat and thin displays are an inevitable trend. The power supply system of the cold cathode tube is a key component group for driving the lamp in the flat panel display. It determines the reliability and stability of the lamp, and its performance directly affects the image quality of the flat panel display. [0003] Please refer to FIG. 1 , which is a block diagram of a conventional cold cathode tube power supply system. The cold cathode tube power supply system 100 includes a voltage converter 110 , a feedback circuit 120 and a control circuit 130 . The voltage converter receives the DC...

Claims

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Application Information

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IPC IPC(8): H05B41/36H05B41/38
Inventor 黄崇荣
Owner QISDA CORP
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