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Circuit for controlling voltage of screen

A voltage control circuit and control circuit technology, applied in the direction of TV, electrical components, color TV, etc., can solve the problems of inability to adjust screen voltage, screen voltage decomposition image display, etc.

Inactive Publication Date: 2006-06-21
NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In addition, the screen voltage could not be adjusted according to the external demand
Therefore, when performing after-sales service, etc., there is a cumbersome problem of dismantling the video display to adjust the screen voltage.

Method used

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  • Circuit for controlling voltage of screen
  • Circuit for controlling voltage of screen

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Embodiment Construction

[0024] see below figure 2 The circuit diagram of is the screen voltage control circuit manufactured according to the present invention. The flyback transformer 102 stores the power supplied to the first coil L1 in the second, third and fourth coils L2, L3 and L4 according to the control of the horizontal output transistor unit 100. The above-mentioned horizontal output transistor unit 100 is composed of transistor TR2, capacitor C2, diode D2 and other components. The configuration of the horizontal output transistor unit 100 is very common, so its detailed description is omitted.

[0025] One end of the fourth coil L4 of the flyback transformer 102 is connected to the rectifier 104, and the other end is grounded through the resistor R2. The rectifier 104 is: the voltage output by the fourth coil L4 is input to the rectifier 104, and the rectifier 104 is composed of a diode D1 and a capacitor C1 to rectify the output voltage of the fourth coil L4 and output it as a stable vol...

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Abstract

A screen voltage control circuit, including: a rectifier that receives power from one end of the secondary coil of the flyback transformer to provide rectification; a resistor connected between the other end of the secondary coil and ground; a screen that receives the output voltage of the rectifier and synthesized by the resistor voltage voltage; and an on-screen voltage regulator for changing the resistor voltage. The additional voltage received by the screen voltage regulator of the present invention for adjusting the screen voltage is provided by the microprocessor; The voltage, and receives the standard voltage from the inverting input terminal, and outputs a voltage that increases the difference between the two voltages; and uses the base terminal to receive the output voltage of the operational amplifier and generates a current corresponding to the voltage, and provides it to the transistor. The invention has the characteristic that the voltage of the screen can be adjusted without disassembling the image display during the manufacture and after-sales service.

Description

(1) Technical field [0001] The invention relates to a screen voltage control circuit, which belongs to the field of video displays. (2) Background technology [0002] Generally, video displays such as TV sets and monitors are equipped with screen voltage control circuits. see figure 1 , the figure is the existing screen voltage control circuit diagram, the rectifier 1 of the screen voltage control circuit is to rectify the input horizontal output voltage Vcp to output a certain DC voltage; then the integrator 2 is to integrate the pulse width modulation input controlled by the microprocessor PWM output; then compare the horizontal output voltage Vcp of the above-mentioned DC voltage output in the comparator 3 and the pulse width modulation signal output by the integration of the above-mentioned integrator 2; then the transistor Q11 converts from the control current Resistor R11 drops the pulse width control screen voltage V G2 ( figure 1 middle G2 point). [0003] In th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N3/18H04N5/63
Inventor 尹柱浩
Owner NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD
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