Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Display, and DC / AC converter

A DC-DC conversion, DC-AC technology, applied in the direction of irreversible DC power input conversion to AC power output, static indicators, output power conversion devices, etc., can solve the problems that cannot meet the TCO brightness change and other problems

Inactive Publication Date: 2007-05-09
BENQ CORP
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TCO has increasingly stringent specifications for displays, and some of the lamps require that the value of the current supplied to the lamp cannot be changed, and the above-mentioned continuous mode DC-AC converter can no longer meet the requirements of TCO brightness changes.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Display, and DC / AC converter
  • Display, and DC / AC converter
  • Display, and DC / AC converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] Please refer to FIG. 3 , which shows a block diagram of a display according to a preferred embodiment of the present invention. The display 300 includes a lamp 340 and a DC / AC converter 360 . The DC-AC converter 360 includes a DC-DC conversion unit 310 , a self-oscillating circuit 320 , a pulse width modulation unit 330 (Pulse Width Modulation, PWM) and a feedback circuit 350 .

[0027] The pulse width modulation unit 330 receives the level signal Bi to output a PWM signal C3, and the pulse width of the PWM signal C3 is determined according to the level signal Bi. The DC-DC converting unit 310 receives the DC voltage Vd3 and converts it into a DC voltage Vd32. The level of the DC voltage Vd32 is determined by the PWM signal C3. The self-oscillating circuit 320 outputs the AC voltage Va3 according to the DC voltage Vd32. The DC-DC converting unit 310 is, for example, a buck converter.

[0028] The DC-AC converter 360 operates in a burst mode, and the level of the out...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The monitor consists of the lamp tube and DC / AC convertor (DAC). DAC consists of the impulse width modulation unit (IWM), the DC / DC conversion unit (DDC) and the self-oscillation circuit (SO). IWM outputs the PWM signal. The impulse width of the PWM signal is decided by the level signal. Receiving the 1st DC voltage, DDC converts it into the 2nd DC voltage. The level of the 2nd DC voltage is decided by PWM signal. According to the 2nd DC voltage, SO produces the AC voltage and sends it to the lamp tube. According to the level signal, the DC / AC converter defines the level of output AC voltage. When DAC works under the burst mode, the level signal is an interlaced hi and low level to cause the output AC voltage burst.

Description

technical field [0001] The present invention relates to a display and its DC-AC converter, and more particularly to a display operating in burst mode and its DC-AC converter. Background technique [0002] Please refer to FIG. 1, which shows a block diagram of a conventional DC-AC converter. The DC-AC converter 100 includes a DC-DC conversion unit 110 , a self-oscillating circuit 120 (Royer circuit), a pulse width modulation unit 130 (Pulse Width Modulation, PWM), and a feedback circuit 150 . The DC-AC converter 100 is used to provide the lamp tube 140 with an AC voltage Va1 to emit light. [0003] The DC-DC conversion unit 110 receives the voltage Vd1 and generates a voltage Vd2. The self-oscillating circuit 120 provides the lamp tube 140 with an AC voltage Va1 according to the voltage Vd2. The lamp tube 140 generates a feedback signal Fb1 to the feedback circuit 150 , and the feedback circuit 150 outputs the feedback signal Fb2 to the pulse width modulation unit 130 acco...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H02M7/48H02M7/5383G09G3/20H05B41/392
Inventor 王博文叶佳翅黄建锟
Owner BENQ CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com