基于单片机的可调直流稳压电源设计_毕设论文

哈尔滨剑桥学院

毕业设计

论文题目：基于单片机的可调直流稳压电源设计

学生：李玉秋

指导教师：刘媛媛讲师

专业：电子信息工程（电气及其自动化）班级：09电气4班

2013年 5 月

毕业设计任务书

毕业设计审阅评语

毕业设计答辩评语及成绩

基于单片机的可调直流稳压电源设计

摘要

随着电子技术的迅速发展，直流电源应用非常广泛，其好坏直接影响着电气设备或控制系统的工作性能，目前，市场上各直流电源的基本环节大致相同，主要都包括交流电源、交流变压器(有时可以不用)、整流电路、滤波稳压电路等。

本文运用了将单片机控制系统应用于开关稳压电源的方法和原理，提出的开关电源可调稳压输出的观点。认为可以实现开关电源的数控调节，并通过分析稳压工作原理、电压调节方法、AD芯片和单片机的工作原理，使输出电压下实现了0.1 ~15V步进调节。最终得出了直流开关电源在单片机的控制下能够输出稳定的、可调的直流电压。

该可调稳压电源不仅具有开关电源体积小，损耗低的优点，还具有线性电源输出电压纹波小，输出特性好的优点。并且引入单片机控制，使其在功能上具有一定智能化，能够满足一般低限度场合的供电需要。具有一定的的研究意义及实用价值。

关键词：稳压电源；单片机；AD

Adjustable DC Regulated Switching Power Supply Base on Single-chip Microcomputer

Abstract

With the rapid development of electronic technology, the DC power supply is widely used, its quality directly affects the electrical device or control the working performance of the system, at present, the market of the direct current power supply the basic link of roughly the same, mainly includes the AC power, the AC transformer (sometimes can not), a rectification circuit, a filtering voltage stabilizing circuit.

This paper discusses the application of the single chip microcomputer control system applied in switching power supply method and principle, puts forward view point of adjustable voltage regulator output switching power supply for. That can realize switching power supply control regulation, and through the analysis of the working principle of voltage, voltage regulation method, A/D chip and the principle, so that the output voltage achieves to step regulator of 0.1~15V. Finally draw the conclusion that the DC switching power supply under the control of single-chip microcomputer can output stable, adjustable DC voltage.

The adjustable regulated power supply has not only the advantages of small volume, low loss,but also the advantages of small output ripple voltage of linear power supply, advantages of output characteristics. And the introduction of SCM control, its function has certain intelligence, can satisfy needs of the general low limit the power occasions. And has certain research value and practical significance.

Keywords:Regulated Power Supply; SCM; AD Chip

目录

摘要......................................................................... I Abstract.................................................................... II 1 绪论. (1)

1.1 可调直流稳压电源国内发展现状 (1)

1.2 可调直流稳压电源国外发展现状 (1)

1.3 可调直流稳压电源研究的目的及意义 (1)

2 可调直流稳压电源的基本原理 (3)

2.1 直流稳压电源总体结构 (3)

2.2 AT89C51单片机原理及其介绍 (4)

2.3 数码管动态显示原理介绍 (8)

2.4 数模转化电路原理介绍 (11)

2.5 电源变压器原理介绍 (15)

2.6 整流电路原理介绍 (15)

2.7 滤波电路原理介绍 (16)

2.8 稳压电路原理介绍 (18)

2.9 保护电路原理介绍 (19)

3 可调直流稳压电源硬件电路设计 (20)

3.1 Protel 99SE (20)

3.2 电源原理图设计 (22)

3.2.1 开关电源电路设计 (22)

3.2.2 模数转换电路设计 (22)

3.2.3 保护电路设计 (23)

3.2.4 单片机控制电路设计 (24)

3.2.5 数码管显示电路设计 (24)

3.2.6 电源硬件电路原理图 (25)

4 可调直流稳压电源软件设计 (26)

4.1 Keil编程软件 (26)