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Voltage-adjustable voltage switching circuit

A technology for voltage conversion circuit and voltage adjustment, which is applied in the direction of output power conversion device, adjustment of electric variable, conversion equipment without intermediate conversion to AC, etc., which can solve the problems of inability to change

Inactive Publication Date: 2006-03-08
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the driving voltage generated by the known technology is a fixed value, it cannot be changed for different product characteristic curves, or it can be flexibly adjusted during detection or analysis

Method used

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  • Voltage-adjustable voltage switching circuit
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  • Voltage-adjustable voltage switching circuit

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Embodiment Construction

[0038] Please refer to image 3 , image 3 It is a schematic diagram of a driving circuit 30 of a thin film liquid crystal display in the first embodiment of the present invention. The driving circuit 30 includes a voltage conversion module 32 and a feedback circuit 34, which can convert the input voltage Vi into the output voltage Vo required by the TFT LCD in operation. In the first embodiment of the present invention, the resistor string 35 of the feedback circuit 34 includes two series resistors R1 and R2, one end of the resistor string 35 is coupled to the output end of the drive circuit 30, and the other end is coupled to a variable voltage source Vx1 . The feedback circuit 34 divides the output voltage Vo through the resistors R1 and R2 to generate a reference voltage Vref at node A, and then feeds the reference voltage Vref back to the voltage conversion module 32, and the voltage conversion module 32 corrects the output according to the reference voltage Vref Volta...

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PUM

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Abstract

Changing value of variable voltage source adjusts the output voltage of the voltage conversion circuit composed of a pulse width modulation circuit and a feedback circuit. The pulse width modulation circuit supplies the output voltage in pulse mode. Through changing width, frequency or distributing rule of pulse changes value or frequency of the output voltage. The feedback circuit includes resistance string composed of multiple cascaded resistances. One end of the resistance string is coupled to the variable voltage source. The one end of the pulse width modulation circuit is coupled between two adjacent series resistances in the resistance string.

Description

technical field [0001] The invention relates to a voltage conversion circuit with adjustable voltage, in particular to a voltage conversion circuit for adjusting the output voltage by changing the value of the variable voltage source. Background technique [0002] In order to satisfy human visual enjoyment, displays have become very popular devices in modern society. With the advancement of technology, the quality of monitors has been gradually improved, and there are more and more types of monitors on the market. Due to the advantages of light weight, low power consumption, and low radiation, liquid crystal displays (Liquid Crystal Displays; LCDs) have been widely used in various portable information products on the market, such as notebook computers (notebooks) and personal digital Assistant (Personal Digital Assistant; PDA) and other products. In addition, LCD screens and LCD TVs have gradually become popular, gradually replacing traditional cathode ray tube (cathode ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10H02M3/155
Inventor 贾玄策黄教忠杨欣陆
Owner AU OPTRONICS CORP