反激式开关电源的毕业设计

常州工学院毕业设计论文

I 摘要

针对晶体管串联提供稳压电源的具有体积很大而且笨重的工频变压器，体积和重量都很大的滤波器，占用较大空间，质量较大，效率较低不适用现在电子技术的发展的的缺点，提出了发展新型电源的意见。为了能够适用电力电子越小型化、轻型化的要求，开关电源随之出现。开关电源采用功率半导体作为开关元件，通过周期性通断开关，控制开关元件的占空来调整输出电压，因为开关电源是直接对电网电压进行整流、滤波、调整，不需要电源变压器，工作频率高，滤波电容小、电感小，所以体积相对较小，而且开关电源的功耗较低，对电网的适用能力强，所以开关电源的应用逐渐取代了传统的电源。开关电源的发展促使了电力电子器件朝着轻薄化的发展，开关电源有多种拓扑结构，选择合适的拓扑结构，合适的器件，是设计开关电源的重中之重。

关键字：开关电源；拓扑结构；稳压管；芯片

常州工学院毕业设计论文

II Abstract

Series to

provide power supply for the transistor with large and bulky

size-frequency transformers, size and weight are great filters, occupy a larger space,

the quality

of larger,

less efficient not apply to the development of electronic

technology is now thepaper proposed the development of new power views.In order

to apply more power electronics miniaturization and light requirements,

switching

power supply soon.Switching power supply using power semiconductor devices as

switches, through periodic on-off switch, control switch to adjust the air component of

the total output voltage, because switching power supply is directly rectified

mains

voltage, filter, adjustment, no

power transformer,

high frequency, filter capacitance,

inductance is small, so relatively small size, low power consumption and switching

power supply on the application of strong power, so switch power gradually replaced

the traditional power.Switching power supply prompted the development of power

electronic devices toward the light of the development of a variety of switching power

supply topology, select the appropriate topology, the appropriate device, is the top

priority of switching power supply design.

Keywords：switch power supply；Topology Structure；stabilivolt；Chip

常州工学院毕业设计论文

III 目录

摘要................................................................................................................................ I

Abstract ......................................................................................................................... II

目录.............................................................................................................................. III

第一章 绪论.................................................................................................................. 1

1.1 开关电源的产生.............................................................................................. 1

1.1.1 开关电源产生的时代背景.................................................................. 1

1.1.2 开关电源的产生.................................................................................. 1

1.2 开关电源的发展.............................................................................................. 2

1.2.1 我国的开关电源的发展........................................................................ 2

1.2.2 国外开关电源的发展............................................................................ 3

1.2.3 开关电源发展的整体趋势.................................................................... 4

1.3 开关电源的现状.............................................................................................. 5

本章小结................................................................................................................. 5

第二章 开关电源的几种结构...................................................................................... 6

2.1 boost电路 ......................................................................................................... 6

2.1.1boost电路图 ............................................................................................ 6

2.1.3 boost电路特点 ....................................................................................... 7

2.2 buck电路 .......................................................................................................... 8

2.2.1 buck电路图 ............................................................................................ 8

2.2.2 buck电路的工作原理 ............................................................................ 8

2.2.3 buck电路的特点 .................................................................................... 9

2.3 正激电路........................................................................................................ 10

2.3.1 正激电路图.......................................................................................... 10

2.3.2 正激电路的工作原理.......................................................................... 10

2.3.3 正激电路的特点.................................................................................. 12

2.4 反激电路........................................................................................................ 12

2.4.1 反激电路图.......................................................................................... 12