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毕业设计

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DZ062开关电源的应用——液晶显示器电源的设计,毕业设计

内容简介：

I 开关电源的应用 液晶显示器的设计 专业： 通信工程 学号 ： 1002566 姓名： 赖宏德 指导教师： 叶宇煌 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。 【关键词】 开关电源， PWM 工作方式， 电流控制模式， UC3842， TL431 ntsII 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. 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. 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 elabor