毕业设计论文

基于单片机的直流稳压电源的设计

摘要

几乎都旋纽开关调节电压，调节精度不高而且经常跳变，使用麻烦。数控电源目前的发展，主要朝着更高的数控精度和分辨率及更好的动态特性；更好的环保性能；智能化与高可靠性；更广泛的应用方向发展。本设计利用AT89S51作为主控芯片，控制数模转换模块DAC0832的输出电压，通过放大器OPA552放大输出。设置四个按键，来实现电压的增减，并带有数码显示模块。电流可以达到200mA。关键词数控电源AT89S51；DAC0832；OPA552

Abstract

Direct current voltage-stabilized power supply is one of the commonly used equipment in electronic technology. It’s widely used in teaching, researching and other fields.Most of the traditional direct current voltage-stabilized power supply use the knob switch to adjust the voltage.It has the trouble of low-precision and difficult to control. The structure is complex and the volume is large.

The numerical control technique of single chip microcomputer is adopted in the design of direct current voltage-stabilized power supply for a digitalized.Having numeral display,the direct current power can adjust voltage programmably and differentiate voltage precisely.Moreover,it’s easy to have its function enlarged through the programmer.Numerical control direct current voltage-stabilized power supply mainly toward to high-precision,high-resolution,better dynamic characteristics,better environmental performance,intelligent,high reliability and wider application direction.

In this design,using the AT89S51 as main module to control the output voltage of DAC0832. The voltage is magnified by amplifier OPA552. In this system, the step of voltage is control by four keys, and the display module is also designed.The step precision is 0.1V,the output voltage is range from 0V to 15V and the current is up to 200mA.

Key words: Numerical control power；AT89S51；DAC0832；OPA552

目录

I

AbstractII

第1章 绪论1

1.1 课题的背景和意义1

1.2 数控电源的发展1

第2章 方案设计3

第3章 系统硬件电路设计4

3.1 主要电路的设计4

3.2 具体电路介绍4

3.2.1 主控单元电路4

3.2.2 信号处理电路8

3.2.3 电压放大电路12

3.2.4 按键电路14

3.2.5 显示电路15

第4章 系统软件设计18

4.1 程序运行原理18

4.2 程序流程19

4.2.1 延时子程序流程19

4.2.2 拆分送显存子程序流程19

4.2.3 显示子程序流程20

4.2.4 主程序流程21

第5章 设计仿真及调试22

5.1 WAVE6000集成调试软件简介22

5.2 程序调试的步骤23

第6章 电