小功率通用开关电源

文档编号:DZXX098  文档字数:10810,页数:28

摘要

 随着计算机技术的高速发展，电子设备与人们的工作、生活的关系日益密切。任何电子设备都离不开可靠的电源，且对电源的要求也越来越高。
 开关型稳压电源以体积小、重量轻、效率高、性能稳定等优点，逐渐取代线性稳压电源。但大部分电源都输出较大电压电流，其功率较大。本文针对此设计了输出5V3A的小功率开关电源。首先对开关电源的发展、分类、工作原理等方面都进行了介绍，并介绍了由具有PWM调制功能的UC3843组成的AC/DC开关电源，对其中输入、输出、变压等电路模块做了比较介绍，且对其中的高频变压器做了简单介绍。
 

关键词：开关电源 ；高频变压器 ； PWM调制
 

ABSTRACT

    With the rapid development of computer technology, electronic equipment and people working and living increasingly close relationship. Any electronic equipment without a reliable power supply, and power requirements of the increasingly high.
    Switch regulated power supply to small size, light weight, high efficiency, stable performance, etc., and gradually replace the linear regulator power supply. However, most power are higher voltage and current output, the larger power. In this paper, the design of the output of the low-power 5V3A Switching Power Supply. First of all, the development of switching power supply, classification, and other aspects of the working principle is described and presented by a PWM modulator UC3843 features composed of AC / DC switching power supply, for which input and output, transformer and other circuit module done A Comparative Introduction, and the high-frequency transformer which has done a brief introduction.

Key words:Switching Mode Power Supply ； High-frequency Transformer ；  PWM Modulation
目录

摘要 I
ABSTRACT II
第1章 引言 1
 1.1开关电源的现状 1
 1.2 本课题研究内容 2
第2章 开关电源概述 3
 2.1 开关电源的分类 3
 2.2 开关电源的工作原理 4
第3章 基于UC3843设计电路 8
 3.1 开关电源的控制方法 8
 3.1.1脉宽调制技术 8
 3.1.2 谐振变换技术 8
 3.1.3 软开关技术 9
 3.2 UC3843的结构特性 9
 3.3 UC3843的工作原理 12
 3.4 设计电路及分析 13
 3.5 电路模块分析 14
 3.5.1输入整流滤波电路 14
 3.5.2 功率变换电路 15
 3.5.3 输出整流滤波电路 16
 3.5.4 短路保护电路 16
 3.5.4 输入过欠压保护 17
 3.6 高频变压器 18
第4章 结束语 21
致谢 22
参考文献 23
附录 实物图 24

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