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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: 2004-05-26
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

[0026] 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.

[0027] 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

The circuit includes following part: rectifier for rectifying power received from one end of secondary coil of flyback transformer; resistance connected between another end of secondary coil and ground; compositive screen voltage from output voltage from the rectifier and resistance voltage; screen voltage adjuster for converting the resistance voltage. The said resistance receives current of difference between screen voltage and standard voltage. The said circuit is not impacted by display mode or change of beam current, and does not need semiconductor tubes for high voltage use. Screen voltage can be adjusted by microprocessor without need of disassembling image display in manufacturing procedure or after 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 Applications(China)
IPC IPC(8): H04N3/18H04N5/63
Inventor 尹柱浩
Owner NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD
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