本 科 生 毕 业 设 计 (论 文)

开关电源设计

教学单位 _ 电气信息工程学院__ _ 专 业 _ 电气工程及其自动化 _

2013年5月

摘 要

本文主要是设计了一个反激式开关电源，在充分考虑到制作成本以及工艺的基础上，只用了简单的电器元件搭成了一个简单的电路原理图。虽然这个开关电源没有用到一些很复杂的芯片，输出电压没有非常稳定，但在一定的要求下，在低端产品应用上还是很有市场。

在设计开关电源电路原理图之前，通过查阅文献资料，采用反激式开关电源的设计方案，增加了一些必要的保护电路，在理论上对开关电源各部分进行论证，使开关电源的输出电压在理论上满足了设计要求，不管是在技术上还是在经济实用上都有一定的课实现性。

这个原理图主要包括整流滤波电路，主电路，三极管保护电路，自激震荡正反馈电路，脉宽调整电路，过电压保护电路以及遥控开关电路。由于这是一个隔离式开关电源，所以在安全上更有保障。当然，在设计开关电源之前，本文第一章介绍了开关电源的整体情况，主要包括开关电源的特点，分类以及开关电源在国内外的发展状况，第二章介绍了几个典型的DC-DC变换器，同时在第三章介绍了开关电源的工作原理，包括串联和并联式的开关电源的工作原理。

关键词： 开关电源 反激式 隔离

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ABSTRACT

In this paper, design a feedback switching power supply, production costs and process on the basis of fully taken into account, only a simple electrical components barricaded a simple circuit diagram. Although this switching power supply is not used very complex chip, the output voltage is not very stable, but under certain requirements, the application of the low-end products on the market place.

Access to literature in the design of switching power supply circuit diagram feedback switching power supply design, some of the necessary protection circuit, in theory, to demonstrate the switching power supply, so that the output voltage of the switching power supply in theoretically meet the design requirements, whether it is technically still have some lessons to achieve economical and practical.

This schematic diagram mainly includes a rectifier and filter circuit, the main circuit, the transistor protection circuit, the self-oscillation is a positive feedback circuit, a pulse width adjusting circuit, overvoltage protection circuit, and a remote control switch circuit. Since this is an isolated switching power supply, security and more secure. Of course, in the design of the switching power supply before The first chapter describes the overall situation of the switching power supply, including the characteristics of the switching power supply, classification and switching power supply development at home and abroad, the second chapter describes several typical DC-DC the converter is explained in Chapter switching power supply works, including series and parallel switching power supply works.

Keywords: Switching power supply Feedback Isolation

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