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Novel architecture of power supply system for liquid crystal display equipment

A technology of liquid crystal display and power system, applied in the field of power system, can solve the problems of low efficiency of PFC circuit and power frequency rectifier, power system efficiency drop, etc.

Inactive Publication Date: 2005-11-02
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low efficiency of the PFC circuit and the power frequency rectifier in the above-mentioned traditional technology, as well as the hot spots caused by their components, have always been relatively difficult problems to overcome, especially in relatively large power applications.
In addition, since the power consumed by the backlight CCFL occupies the vast majority in the power system of LCD devices (generally 70% to 80% of the rated power in LCD TVs), the conversion loss of this main DC / DC converter will be significant cause a decrease in the efficiency of the entire LCD device power system

Method used

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  • Novel architecture of power supply system for liquid crystal display equipment
  • Novel architecture of power supply system for liquid crystal display equipment
  • Novel architecture of power supply system for liquid crystal display equipment

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Embodiment Construction

[0023] Please refer to figure 2 , which shows the schematic circuit diagram of the first preferred embodiment of the novel power system architecture of the LCD device proposed by the present invention. One of the front-end dual boost power factor correction (Dual BoostPFC) circuit 10, its input terminal is directly connected with the power frequency AC power grid, while realizing the power factor correction function of the input current, it converts the power frequency AC voltage into a stable DC Bus voltage V Bus . One to several inverters 30 1 , 30 2 to 30 nUsed to drive corresponding cold cathode fluorescent lamps (CCFL) to provide liquid crystal display (LCD) panel backlight. The input terminal of these inverters is directly connected to the output terminal of the front-end power factor correction (PFC) circuit, and its input voltage is the output voltage V of the power factor correction (PFC) circuit. Bus . There is another DC / DC converter (DC / DC converter) 20 who...

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Abstract

The invention discloses a new frame, which comprises: a Dual Boost PFC circuit connects to input ac and produces dc bus output voltage; at least one inverter connected to Dual Boost PFC circuit to drive at least one CCFL to supply backlight source of LCD panel; and a DC / DC converter connected to Dual Boost PFC circuit to supply power. Compared with existing technique, it gets rid of an input rectifier and a DC / DC converter between PFC circuit and backlight inverter, and can obtain higher conversion efficiency.

Description

technical field [0001] The invention is applied to the power supply system with LCD backlight power supply, including LCD TV, LCD display and other power supply systems with CCFL backlight. Background technique [0002] For legacy techniques, see figure 1 . In the traditional LCD equipment power supply system solution, the AC voltage from the mains needs to be rectified by the power frequency and used as the input voltage of the power factor correction (PFC) circuit, and the inverter that drives the backlight CCFL converts the +24V DC input voltage It is an AC high voltage of several hundred to more than one thousand volts. Therefore, there is a main DC / DC (DC / DC) converter at its input front end to convert the high-voltage DC bus (Bus) voltage output from the PFC circuit into +24V DC voltage, and at the same time realize the backlight inverter and front-end PFC Safe isolation of circuits. In addition, an auxiliary direct current / direct current (DC / DC) converter is used ...

Claims

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Application Information

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IPC IPC(8): G02F1/133H02M1/00H02M1/12H02M1/42H02M7/217H02M7/48H05B41/24H05B41/282
CPCH02M7/48H05B41/282H02M2001/007Y02B70/126H02M1/4208H02M2001/009Y02B20/183H02M1/4233H05B41/245H02M2001/008Y02B20/00Y02B70/10H02M1/008H02M1/009H02M1/007H02M1/0085B60R16/0215H02G3/30
Inventor 应建平孙超群甘鸿坚
Owner DELTA ELECTRONICS INC
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