开关电源的应用液晶显示器电源的设计（开题报告+论文+外文翻译+

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目录 
第一章 绪 论 1
1.1 国内外开关电源的发展与趋势 1
1.2 两种电源的基本原理 2
1.2.1线性稳压电源 2
1.2.2开关稳压电源 3
1.2.2.1开关电源的基本组成 3
1.2.2.2开关电源稳压原理 4
1.2.2.3开关电源的优点 5
1.3 本章小结 5
1.4 本文所做工作 6
第二章 开关电源控制理论介绍 7
2.1 开关电源控制方式 7
2.2 脉宽调制式开关电源的基本原理 7
2.3 集成PWM控制器原理 8
2.4 脉宽调制下开关电源控制方式的选择 9
2.4.1电压型控制 9
2.4.2电流型控制 10
2.5 电流型控制斜坡补偿分析 11
第三章 开关电源设计中涉及的重要器件 12
3.1 TL431集成电路 12
3.1.1 TL431的简介 12
3.1.2 恒压电路应用 13
3.2 UC3842集成电路 14
3.2.1UC3842工作原理 14

3.2.2UC3842内部振荡器的工作原理 16
3.2光电耦合器 17
第四章 开关电源电路的设计 19
4.1开关电源电路设计要求 19
4.2电路工作原理 19
4.2.1 频率的设定 19
4.2.2 启动过程 21
4.2.3稳压过程 21
4.2.4过流保护原理 22
4.2.5过压保护原理 22
4.2.6开关管保护电路 22
4.2.7反馈绕组的设计 22
第五章开关电源的EMC设计考虑 23
5.1开关电源电磁干扰的产生机理 23
5.2 EMI滤波器工作原理及安装 23
5.3设计开关电源电路板时应注意的问题 25
5.3.1 开关电源PCB的布局原则 25
5.3.2 开关电源PCB的布线原则 25
5.4本章小结 26
第六章整机性能测试 27
6.1测试的实验数据 27
6.2测试实验波形 30
6.3实验小结 31
结论 32
谢辞 33
参考文献 34
附录 35

中文摘要 
随着电力电子技术的发展，电力电子设备与人们的工作、生活关系日益密切，而任何电子设备都离不开可靠的电源。进入90年代开关电源相继进入各种电子、电器设备领域，如程控交换机、通讯、电子检测设备电源、控制设备电源等。单片开关电源管理集成电路具有高集成度、高性价比、简单外围电路、优越性能指标等优点，目前已成为国际上开发中、小功率开关电源、精密开关电源、专用开关电源以及开关电源模块的优选集成电路，使得开关电源正朝着短、小、轻、薄的方向发展，所以得到了广泛应用。 
本文设计了一种应用于液晶显示器终端的电流模式开关电源控制电路.该电路具有短路保护、过压保护、过流保护等功能。 
论文首先对国内外的发展与趋势和两种电源的基本原理做了介绍。 

论文的第二章介绍了开关电源控制方式。开关电源有三种控制方式：脉冲宽度调制(PW M)、脉冲频率调制(PFM)、脉冲宽度频率调制(PWM-PFM)。介绍了脉宽调制式开关电源的基本原理。着重介绍了脉宽调制方式下开关电源控制方式的选择。阐述了与传统的电压控制模式相比，电流控制模式具有许多优越性，同时也存在一些必须克服的问题。
文章的第三章是对本次设计所需的主要电子元件进行介绍。主要介绍了TL431集成电路、UC3842集成电路、光电偶合器的原理及其应用。 
文章的第四章是介绍电路总体结构设计。阐述开关电源电路工作原理以及总体设计。 
文章的第五章主要介绍开关电源的EMC问题。首先分析开关电源电磁干扰的产生机理，然后介绍EMI滤波器的工作原理及安装注意要点，最后论述设计电路板的几个原则。 
文章的第六章是对实际设计制作电源测试及其实验总结。 [资料来源：http://think58.com]

【关键词】 开关电源， PWM工作方式，电流控制模式，UC3842，TL431

The application of Switching Power Supply 
ABSTRACT
With the development of electric and electronic technology, the electric and Electronic equipments have been used broadly in our work and life. Every electronic equipment can not work without reliable power. In 1990s the switching power had been used in all kinds of fields, such as exchanger, communication and control equipments. Single-chips witching power supply management Integrated Circuit (IC) has many virtues such as high integration level, most cost effective, lowest component count switcher solution, and high performance. The switching power IC is selected firstly in the design of high power switching power supply, precision switching power supply, application specific switching power supply and so on in the world, which has been making switching power supply short, small, light and thin。So it has been used broadly.

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A current-model controller witch is applied in liquid crystal display terminal is designed in this thesis. The whole circuit includes Short circuit protection，Over Voltage Protection and over current protection circuit .
The development and tendency of domestic and foreign and the basic principle of two kind powers are presented in the front part of this paper.
In chapter II, the control method of Switching power supply is introduced. Switching Power Supply has three kinds of control circuits: Pulse Width Modulation (PWM) Pulse Frequency Modulation (PFM) Pulse Width and Frequency Modulation (PWM-PFM). The switching power supply basic principle of Pulse Width Modulation is introduced in the thesis. Under pulse-duration modulation way switching power supply control mode choice is introduced in detail. Compares with the traditional voltage control model, the current control model has many superiority. But simultaneously it also has some problems that must be over came.
In chapter III，the main electronic component needs which to this design are presented. Mainly introduced the principle and application of the rectification diode, power MOSFET, the TL431 integrated circuit, the UC3842 integrated circuit. In chapter IV, the current model control PWM converter is discussed in detail.  [资料来源：http://www.THINK58.com]
The circuit overall structural design and the switching power supply circuit principle of work as well as the system design is introduced in chapter IV. Switching power supply EMC question is introduced mainly in chapter VI. Firstly, analyzing the production mechanism of the switching power supply electronmagetic interference, then introducing the work principle of the EMI filter and the important points that should be paying attention to when Installing, finally elaborating several principles of designing circuit board. Finally, some experimental results are presented.

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Keyword：switching power supply,PWM,the current control model,
UC3842 ,TL431 [资料来源：http://think58.com]

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