发布时间 : 星期二 文章毕业设计-开关电源更新完毕开始阅读
本科毕业论文(设计)
题 目： 多路输出开关电源的设计
学 院： 自动化工程学院
专 业： 电气工程及其自动化
姓 名： 刘明锋
指导教师： 王忻
2006年 5 月 30 日
青岛大学本科生毕业论文（设计）
Multi-output Switching Power Supply
青岛大学本科生毕业论文（设计）
摘 要
本文比较全面地阐明了开关电源的基本原理。首先介绍了开关电源的发展趋势，然后介绍了电路拓扑结构，并分析它们的优缺点。再后介绍了开关电源的控制原理，并简单介绍了隔离技术。当然也介绍了有关软开关的技术。在此基础上，设计了一个计算机用多路数出开关电源。这个开关电源为220V交流输入，±5V，±12V输出，频率为50kHz。首先对主电路进行了设计，即设计了一个半桥型电路。其次，对开关电源的控制电路、驱动电路、保护电路进行设计，控制电路以SG3525为核心。
关键词 开关电源 多路输出 SG3525 电压型控制
Abstract
The fundamental of the switching power supply is illustrated in this paper. Firstly, the development tendency is introduced. And then the main circuit of the power supply is introduced, and the comparison between them is given. Last, introduce the control theory and also introduce the isolation technology. Of course the soft switching technique is also introduced. And then the Multi-output Switching Power Supply was designed. The switching power supply is AC220V input and ±5V, ±12V output, the frequency is 50kHz.Firstly, the main circuit of the power supply is designed, the half-bridge circuit. Secondly, the control circuit, the driver circuit, the protect circuit of the power supply are analyzed and designed, control circuit is centered on SG3525.
Keywords switching power Multi-output SG3525 voltage control
青岛大学本科生毕业论文（设计）
目 录
第1章 引言 ................................................................................................................ 1
1.1 电源技术的发展及方向 ......................................................................................................... 1 1.1.1 线性电源 ........................................................................................................................... 1 1.1.2 开关电源 ........................................................................................................................... 2 1.2 开关电源技术的分类 ............................................................................................................. 3 1.3 开关电源的应用及发展趋势 ................................................................................................. 3 1.4 本文的工作 ............................................................................................................................. 4
第2章 开关电源电路原理与方案论证 .................................................................... 5
2.1 DC/DC变换器拓扑 ................................................................................................................ 5 2.1.1 基本DC/DC变换器拓扑 ................................................................................................. 5 2.1.2 正激变换器(Forward Converter) ...................................................................................... 6 2.1.3 反激变换器(Flyback Converter) ...................................................................................... 6 2.1.4 推挽变换器(Push-Pull Converter) .................................................................................... 7 2.1.5 半桥变换器(Half-bridge Converter) ................................................................................. 7 2.1.6 全桥变换器(Full-Bridge Converter)................................................................................. 8 2.2 软开关的选用 ......................................................................................................................... 9 2.2.1 软开关技术的发展 ........................................................................................................... 9 2.3 控制电路 ............................................................................................................................... 10 2.3.1 开关电源控制方式 ......................................................................................................... 10 2.3.2 脉宽调制式开关电源的基本原理 .................................................................................. 11 2.3.3 脉宽调制式开关电源控制方法的选择 .......................................................................... 11 2.4 开关电源电路的隔离技术 ................................................................................................... 13
第3章 电路设计 ...................................................................................................... 14
3.1 具体指标及电路结构形式的选择 ....................................................................................... 14 3.2 主电路的设计 ....................................................................................................................... 14 3.2.1 主变压器的设计 ............................................................................................................. 14 3.2.2 输出滤波电路的设计 ..................................................................................................... 15 3.2.3 开关器件及二极管的设计 ............................................................................................. 16 3.3 控制电路的设计 ................................................................................................................... 18 3.3.1 总体控制方案 ................................................................................................................. 18 3.3.2 PWM控制器的设计 .................................................................................................... 18 3.3.3 驱动电路的设计 ............................................................................................................. 22 3.3.4 保护电路的设计 ............................................................................................................. 23