液晶电视高能效整合电源设计技术及应用
发布时间：2019-04-02 03:58
【摘要】：现代社会能源日益紧张,提供低功耗、高能效的电器产品是社会与消费者的需求,是政府的导向,也是企业的责任与义务。对液晶电视而言,提高电源系统的转换效率与集成度、降低电视待机功率是实现低功耗、高能效的重要途径。 LED (Light Emitting Diode发光二极管)背光控制及显示技术凭借节能环保、显示效果出色等优点已经全面取代CCFL (Cold Cathode Fluorescent Lamp冷阴极萤光灯管),在现阶段液晶电视产品上普遍使用。而高性价比的LED驱动技术是支撑LED显示技术的重要内容,如何开发出高效,节能的LED驱动技术成为业界各大厂家追逐的重点目标。 目前的LED电视产品的供电多采用电源部分和LED驱动部分分立实现的方式,且中大尺寸产品电源部分均采用多级电能转换(两级或三级),因而不可避免地带来了电能利用效率降低与电路中电子、磁性等元器件使用过多的问题。此外,目前LED电视产品LED驱动部分普遍采用国外厂商提供的专用控制芯片,在一定程度上对国内电视厂商形成了技术壁垒。 本文对课题的研究背景和国内外现状做了简要的概述；介绍了与课题相关的基本理论；以“高效节能”的设计主题为指导,重点研究高能效整合电源设计实现LED背光液晶电视电源部分与LED驱动电路的整合设计。最后通过硬件实现和性能测试,真正实现了“整合设计”和“高效节能”,并在设计中实现了以下创新：通过减少电能转换级数的电路架构并优化LED驱动电路的方式来提高电能利用效率和系统的集成化程度,符合业界和整个社会对于高能效产品的需要与追求；同时,采用基于通用PWM (Pulse Width Modulation脉冲宽度调制)控制芯片的LED驱动设计来代替专用的LED驱动芯片,提高国内LED驱动技术的自主化和国产化程度。主要表现在以下方面： (1)电源整合设计：采用了创新高效的单级PFC (Power Factor Correction功率因素校正)电路架构,仅采用一级电能转换实现了传统方案中三级电能转换才能实现的功能,提高了系统集成度与电能转换效率。 (2)驱动整合设计：在LED驱动方面,自主知识产权的LED电压叠加技术,实现了驱动电路的整合。 (3)基于通用PWM控制芯片的全功能LED驱动电路设计：突破上游厂商和国外芯片厂家的技术壁垒,开发了具有自主知识产权的高效节能的LED一体化驱动技术,使得LED驱动部分的电路结构选择、相关控制与保护功能可以自主地进行设计与实现,提高了国内LED驱动技术的自主化和国产化程度 (4)动态扫描多路LED控制技术：在电视整机产品的能效、2D/3D画质与功能方面的技术自主化程度有了大幅提高,大大降低了对上游液晶屏厂商与相应的芯片设计厂商的依赖程度。 本论文的理论推导和设计实现,为液晶电视提供高能效整合电源,为后续“高效节能”设计方面的进一步研究和推广奠定了基础。
[Abstract]:The modern society energy is increasingly tense, providing low power consumption, high energy efficiency of electrical products is the needs of the society and consumers, is the guidance of the government, but also the responsibility and obligation of the enterprise. For LCD TV, improving the conversion efficiency and integration of the power supply system and reducing the standby power is an important way to achieve low power consumption and high energy efficiency. LED (Light Emitting Diode (Light emitting Diode) backlight control and display technology has completely replaced CCFL (Cold Cathode Fluorescent Lamp cold cathode fluorescent tubes with the advantages of energy saving and environmental protection, excellent display effect, etc.), it is widely used in liquid crystal TV products at this stage. And the cost-effective LED driver technology is an important part of supporting LED display technology. How to develop an efficient and energy-efficient LED driver technology has become the key goal pursued by the major manufacturers in the industry. At present, the power supply of LED TV products is mostly realized by the separation of the power supply part and the LED driver part, and the power supply part of the medium and large size products adopts multi-stage power conversion (two-or three-stage). Therefore, it is inevitable to reduce the efficiency of power utilization and the excessive use of electronic, magnetic and other components in the circuit. In addition, at present, the special control chip provided by foreign manufacturers is widely used in the LED driver part of LED TV products, which forms a technical barrier to domestic TV manufacturers to a certain extent. This paper gives a brief overview of the research background and current situation at home and abroad, and introduces the basic theories related to the subject. Guided by the design theme of "high efficiency and energy saving", this paper focuses on the design of high energy efficiency integrated power supply to realize the integration of LED backlit LCD TV power supply and LED driver circuit. Finally, through hardware implementation and performance testing, the "integrated design" and "efficient energy saving" are truly realized. The following innovations have been realized in the design: to improve the efficiency of power utilization and the integration of the system by reducing the circuit structure of the power conversion series and optimizing the LED driving circuit. Meet the needs and aspirations of the industry and society as a whole for energy-efficient products; At the same time, the design of LED driver based on universal PWM (Pulse Width Modulation (pulse width modulation) control chip is used to replace the special LED driver chip to improve the independence and localization of the domestic LED driver technology. The main performances are as follows: (1) Power supply integration design: using innovative and efficient single-stage PFC (Power Factor Correction power factor correction) circuit architecture, Only one-stage power conversion is used to realize the function of three-stage power conversion in the traditional scheme, which improves the system integration and power conversion efficiency. (2) driver integration design: in the aspect of LED driver, LED voltage superposition technology based on independent intellectual property is used to realize the integration of driving circuit. (3) the design of full-function LED driver circuit based on universal PWM control chip: break through the technical barriers of upstream manufacturers and foreign chip manufacturers, and develop the efficient and energy-saving integrated LED driving technology with independent intellectual property rights. So that the circuit structure of the LED driver can be selected, and the related control and protection functions can be designed and implemented independently. Improved the degree of autonomy and localization of domestic LED driving technology (4) dynamic scanning multi-channel LED control technology: the efficiency of the whole TV product, the quality and function of 2D/3D picture technology has greatly improved the degree of technological autonomy. Greatly reduced the degree of dependence on upstream LCD manufacturers and the corresponding chip design manufacturers. The theoretical derivation and design realization of this paper provide high energy efficiency integrated power for LCD TV, and lay a foundation for further research and promotion of "high efficiency and energy saving" design.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TN949.192;TN86
本文编号：2452214
[Abstract]:The modern society energy is increasingly tense, providing low power consumption, high energy efficiency of electrical products is the needs of the society and consumers, is the guidance of the government, but also the responsibility and obligation of the enterprise. For LCD TV, improving the conversion efficiency and integration of the power supply system and reducing the standby power is an important way to achieve low power consumption and high energy efficiency. LED (Light Emitting Diode (Light emitting Diode) backlight control and display technology has completely replaced CCFL (Cold Cathode Fluorescent Lamp cold cathode fluorescent tubes with the advantages of energy saving and environmental protection, excellent display effect, etc.), it is widely used in liquid crystal TV products at this stage. And the cost-effective LED driver technology is an important part of supporting LED display technology. How to develop an efficient and energy-efficient LED driver technology has become the key goal pursued by the major manufacturers in the industry. At present, the power supply of LED TV products is mostly realized by the separation of the power supply part and the LED driver part, and the power supply part of the medium and large size products adopts multi-stage power conversion (two-or three-stage). Therefore, it is inevitable to reduce the efficiency of power utilization and the excessive use of electronic, magnetic and other components in the circuit. In addition, at present, the special control chip provided by foreign manufacturers is widely used in the LED driver part of LED TV products, which forms a technical barrier to domestic TV manufacturers to a certain extent. This paper gives a brief overview of the research background and current situation at home and abroad, and introduces the basic theories related to the subject. Guided by the design theme of "high efficiency and energy saving", this paper focuses on the design of high energy efficiency integrated power supply to realize the integration of LED backlit LCD TV power supply and LED driver circuit. Finally, through hardware implementation and performance testing, the "integrated design" and "efficient energy saving" are truly realized. The following innovations have been realized in the design: to improve the efficiency of power utilization and the integration of the system by reducing the circuit structure of the power conversion series and optimizing the LED driving circuit. Meet the needs and aspirations of the industry and society as a whole for energy-efficient products; At the same time, the design of LED driver based on universal PWM (Pulse Width Modulation (pulse width modulation) control chip is used to replace the special LED driver chip to improve the independence and localization of the domestic LED driver technology. The main performances are as follows: (1) Power supply integration design: using innovative and efficient single-stage PFC (Power Factor Correction power factor correction) circuit architecture, Only one-stage power conversion is used to realize the function of three-stage power conversion in the traditional scheme, which improves the system integration and power conversion efficiency. (2) driver integration design: in the aspect of LED driver, LED voltage superposition technology based on independent intellectual property is used to realize the integration of driving circuit. (3) the design of full-function LED driver circuit based on universal PWM control chip: break through the technical barriers of upstream manufacturers and foreign chip manufacturers, and develop the efficient and energy-saving integrated LED driving technology with independent intellectual property rights. So that the circuit structure of the LED driver can be selected, and the related control and protection functions can be designed and implemented independently. Improved the degree of autonomy and localization of domestic LED driving technology (4) dynamic scanning multi-channel LED control technology: the efficiency of the whole TV product, the quality and function of 2D/3D picture technology has greatly improved the degree of technological autonomy. Greatly reduced the degree of dependence on upstream LCD manufacturers and the corresponding chip design manufacturers. The theoretical derivation and design realization of this paper provide high energy efficiency integrated power for LCD TV, and lay a foundation for further research and promotion of "high efficiency and energy saving" design.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TN949.192;TN86
【参考文献】
相关期刊论文 前1条
1 季旭东;LCD背光源产品的新发展[J];液晶与显示;2002年02期
，本文编号：2452214
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