正负可调直流稳压电源设计

正负可调直流稳压电源设计

正负可调直流稳压电源设计

姓 名：张 平

学 号：141900143

专 业：电子信息工程

指导老师：李 继 强

学 院：电气信息学院

日 期：2015年01月01日

I 摘 要

在电子电路设计中，最离不开的就是电源。不管是调试测试电路，还是驱动电路，这些都离不开电源的应用。在本设计中采用5W，220V—12V的变压器来将220V电压降压。用三端可调节正电压稳压器LM317和三端可调节负电压稳压器LM337形成正负电压生成电路。正负可调直流稳压电源由电源变压器、整流电路、前级滤波电路、稳压电路和后级滤波电路共五部分组成。设计的可调电源具有电压正负可调、电路简单、成本低廉的优点。在电路中由于需要交流变直流，所以采用各种电容，运用电容充放电的原理来调整交流电到直流电。

关键词：可调电源 电容滤波 稳压

II Abstracted

Adjustable DC regulated power supply is a DC power supply is often used in

the real experiment, its main principle is divided into four parts, transformer,

rectifier, filter, adjustable output. The four part is the title of one step one step,

are indispensable. After the regulation and role of the four sector, will put the

220V AC sinusoidal into positive and negative adjustable DC power supply

voltage regulator. To act with voltage of the chip LM317 and LM337. The two

chip can lead in the middle bridge rectifier, voltage can be adjusted to achieve

positive and negative.

Key word: adjustable power source;Capacitance smoothing ;

voltage stabilization ;

目 录

摘 要 ............................................................................................................................. I

Abstracted .................................................................................................................... II

目 录 .......................................................................................................................... III

第一章 方案论证和比较 ............................................................................................. 1

1.1 设计任务 ................................................................................................... 1

1.2 设计方案与选择 ....................................................................................... 1

1.2.1 设计方案比较 ........................................................................... 1

1.2.2 方案选择确定 ........................................................................... 1

1.3 设计流程图 ............................................................................................... 2

1.4 方框图 ....................................................................................................... 2

第二章 设计原理与分析 ............................................................................................. 3

2.1 变压器的原理与分类 ............................................................................... 3

2.1.1 变压器工作原理 ....................................................................... 3

2.1.2 变压器分类 ............................................................................... 3

2.2 桥式整流 ................................................................................................... 4

2.3.1 整流二极管 ............................................................................... 4

2.3.1 整流桥 ....................................................................................... 5

3.3 滤波电路 ................................................................................................... 7

2.3.1 滤波电路的概念 ....................................................................... 7

2.3.1 滤波电路的性能 ....................................................................... 9

2.4 稳压及调节电路 ..................................................................................... 10

2.4.1 主流器件 ................................................................................. 10

2.4.2 稳压与输出可调原理 ............................................................. 13

第三章 电路设计 ....................................................................................................... 14

3.1 变压与整流电路 ..................................................................................... 14

3.1.1 变压器的选择 ......................................................................... 14

3.1.2 整流电路设计与二极管选择 ................................................. 15

3.2 前级滤波电路设计 ................................................................................. 16

3.3 稳压电路设计 ......................................................................................... 17

3.4 后级滤波电路设计 ................................................................................. 18

3.5整体电路 .................................................................................................. 19

第四章 调试方案与测试结果 ................................................................................... 20

4.1 变压器降压检测 ..................................................................................... 20

4.2 整流桥整流检测 ..................................................................................... 21