文档介绍：摘   要
本文介绍了用PWM实现直流电机调整的基本方法。本文在给出直流电机调整和PWM实现方法的基础上,提供一种用单片机软件实现PWM调速的方法,-51单片机用软件产生PWM信号的途径,在给出直流电机调整的实现方法的基础上,提供一种用单片机软件实现调速的方法。系统以8051单片机为核心,以小直流电机为控制对象,实现速度单闭环、,用键盘输入有关控制信号及参数,可以实现电机的启制动、正反转、,主要包括MCS-51电路,电源,键盘和显示电路,驱动电路,最后画出程序流程图.
关键词:MCS-51;PWM;硬件;直流电机
 
ABSTRACT
The paper introduces a basic kind of method of DC-motor speed modification based on PWM theory. Showing some relative knowledge upon DC motor speed modification, the PWM theory and the way to implement. It emphasizes on the way for carrying out PWM signals based on MCS-51. Taking 8051 Single Chip Micyoco as core and the little direct current motor as control object, the single closed loop speed control and PID control were realized. In the convenient man-machine interaction interface,the control signal and parameter were inputted with that the start and brake of motor and speed regulation were also realized. Provided main electric circuit principle diagram and each parts of electric circuit principle diagram, mainly include electric circuits MCS-51s, power supplies, keyboard and manifestation electric circuit, drive electric circuit, draw a procedure flow chart finally.
Keyword: MCS-51 ;PWM ;Hardware ;DC Motor
目录
摘    要 I
ABSTRACT II
1 绪论 1
1
PWM整流电源发展概况 1
,研究意义和研究目标 2
2 PWM整流技术的现状 3
PWM整流研究概述 3
PWM整流的基本原理 5
3 核心芯片的选择 10
10
基于单片机控制的特点 11
MCS-51单片机特点 12
4系统的硬件电路设计 13
13
13
系统主回路电路图 14
14
单片机的选型AT89C51 14
IGBT介绍 16
EXB841控制的IGBT 20
8255芯片及功能图 22
ADC0809芯片及功能图 23
DAC0832模数转换器的介绍 25
LED显示屏的介绍 27
系统外围电路及开关稳压电源 28
单片机外围电路连接图 28
开关式稳压电源的原理电路 28
29
29
5 系统的软件设计简介 32
32
32
系统主程序 32
按键流程图及程序 34
34
按键子程序 34
8279可编程键盘及键盘扫描程序 36