微机控制的pwm变频调速系统研究.doc

约36页DOC格式手机打开展开

微机控制的pwm变频调速系统研究,微机控制的pwm变频调速系统研究全文36页约17000字论述翔实摘要本设计详细描述了微机控制的pwm变频调速系统。主电路采用二极管进行不可控整流,用pwm逆变器同时调压调频,开关元件用gtr,组成了交-直-交电压型变频器,变频器采用恒压频比控制方式。控制电路的核心是具有ibm pc/xt扩展槽的微机或兼容机,通过键盘输...
编号:10-26358大小:1.24M
分类: 论文>计算机论文

内容介绍

此文档由会员 棉花糖糖 发布

微机控制的PWM变频调速系统研究

全文36页 约17000字 论述翔实

摘 要

本设计详细描述了微机控制的PWM变频调速系统。主电路采用二极管进行不可控整流,用PWM逆变器同时调压调频,开关元件用GTR,组成了交-直-交电压型变频器,变频器采用恒压频比控制方式。控制电路的核心是具有IBM PC/XT扩展槽的微机或兼容机,通过键盘输入给定值,并与反馈值进行比较通过电压调节器,电流调节器将信号送给可编程SPWM调制波集成芯片HEF4752V,产生2-5KHz的开关信号,从而根据系统需要控制GTR的导通和截止,即调节它的占空比,而改变电压和频率,并可得到非常逼真的可调的正弦波形。为了调速系统能够稳定的运行本设计用LEM模块测电流和光电计数测速,组成转速,电流双闭环并送到微机进行相应调整。此外通过LEM模块测直流侧电压、电流,通过微机判断是否过压、过流,并发出相应控制信号,对系统进行保护,增加系统可靠性。设计还给出了系统总体设计方案,硬件、软件的控制策略及其实现,数据计算、产品选型原则和程序代码。

关键词:正弦脉宽调制(SPWM),变频器,微机,交流调速。

Abstract

In this paper,a GTR VVVF system controlled by microcomputer is described。Main circuit adopts VD as UR, and at the same time vary the voltage and frequency with PWM inverter. and with GTR we can compose AC-DC-AC VSC (voltage source converter). And it controls in the way of constant voltage against constant frequency .The cores of the control circuit is microcomputer with IBMPC/XT ISA,which depends on the keyboard to give the setting frequency values,then comparing the values with the back values. With the VM(voltage modulator),the current modulator can give signals to three-phase programmed SPWM modulate wave integrated chip HEF4752V,it produces 2-5Kz control signal to let GTR on or off .that is to say ,its sine wave can be adjusted。Thus by changing voltage and frequency ,we can get very real and changeable In order to make the system work stably ,in this design,. It counts and examine current or rotational speed through the LEM or photo electricity. it sends processor to carry on corresponding adjustment .In addition, to make the system strengthen by stability and protect the system itself,, the PC judgment if over pressure,over current ,and through the LEM the voltage and current value of the DC side..., some of design reached systematically in introduction step by step deep into,construction clarity。 The design has given out the overall plan of the system,the control strategy and realization of the hardware,software,data calculation,the choice principle of the product type and procedure codes。
Keywords:SPWM;inverter;PC;AC speed adjustment system

目录

前言
第一章 概述----------------------------------------------------------------------------------2
1.1交流调速的概况和发展趋势-------------------------------------------------------------------2
1.2变频调速原理-------------------------------------------------------------------------------------2
1.3变频器的选用-------------------------------------------------------------------------------------5
第二章 系统组成原理-----------------------------------------------------------------------7
2.1系统设计方案的确定----------------------------------------------------------------------------7
2.2系统总体结构-------------------------------------------------------------------------------------7
第三章主电路设计--------------------------------------------------------------------------10
3.1系统主电路的设计------------------------------------------------------------------------------10
3.2GTR的基本构成和开关特性------------------------------------------------------------------10
3.3GTR的驱动电路---------------------------------------------------------------------------------12
第四章控制保护电路设计-----------------------------------------------------------------14
4.1GTR的保护--------------------------------------------------------------------------------------------14
4.2泵升电压限制电路-----------------------------------------------------------------------------------15
4.3检测电路-----------------------------------------------------------------------------------------------15
第五章 PWM脉冲的调制和生成--------------------------------------------------------20
2.1完全由模拟电路生成---------------------------------------------------------------------------20
2.2由专用集成芯片生成---------------------------------------------------------------------------20
2.3 PWM的调制方法和控制技术----------------------------------------------------------------24
第六章 参数计算---------------------------------------------------------------------------28
第七章 主要芯片介绍---------------------------------------------------------------------30
7.1ADC0809------------------------------------------------------------------------------------------30
7.2CD4527---------------------------------------------------------------------------------------------31
第八章 软件设计----------------------------------------------------------------------------32
8.1系统主程序-------------------------------------------------------------------------------32
8.2系统子程序-------------------------------------------------------------------------------33
参考文献--------------------------------------------------------------------------------------56
结束语-----------------------------------------------------------------------------------------57

部分参考文献

[7]扬素行等编著 微型计算机系统原理及应用.(M) 北京:清华大学出版社,1995
[8]邹军安、周少武、欧青立编著 微机控制技术实验指导书.(M)湖南: 湘潭工学院,2002
[9]李兰友、王勇才、傅景义主编 单片机开发应用十例.(M)北京:电子工业出版社1994
[10]陈伯时主编.电力拖动自动控制系统[M].北京:机械工业出版社,2000
[11]陈继勋,周少武,王新,沈洪远,韩兵欣,徐文尚主编.微型计算机控制技术[M].江苏:中国矿业大学出版社,2001