本片畢業(yè)論文是基于單片機的畢業(yè)論文論文內(nèi)容詳盡，具體包括內(nèi)容如下：

摘 要

隨著社會的發(fā)展，自動控制成為越來越多人們關(guān)注的焦點,自動調(diào)節(jié)電阻爐溫度系統(tǒng)也備受關(guān)注。其中微機及其應用已經(jīng)成為高、新科學技術(shù)的重要內(nèi)容和標志之一，它在國民經(jīng)濟的各個領(lǐng)域正在發(fā)揮著引人注目的作用。微機控制的電阻爐溫度控制系統(tǒng)實際上就是一個自動控制系統(tǒng)，是一種能耗相對來說比較低的溫度控制系統(tǒng)。
本文采用AT89C51單片微機對電阻爐的加熱過程進行控制。使用熱電偶作為溫度傳感器把熱信號轉(zhuǎn)變成電信號，電信號再經(jīng)過放大，經(jīng)過模數(shù)轉(zhuǎn)換再輸入到CPU。溫度控制的原理是通過調(diào)整晶閘管的導通時間來調(diào)節(jié)加熱主回路的有效電壓,從而達到溫度控制的目的。系統(tǒng)由AT89C51單片機、溫度傳感器、A/D轉(zhuǎn)換器、鍵盤及顯示電路、晶閘管觸發(fā)電路等組成的控制器和被控對象電阻爐構(gòu)成一個閉環(huán)控制系統(tǒng)。系統(tǒng)控制程序采用模塊化設(shè)計結(jié)構(gòu)，主要包括主程序、T0中斷服務子程序、溫度采樣子程序、顯示子程序、溫度控制子程序等。系統(tǒng)采用過零觸發(fā)等技術(shù)，省去了傳統(tǒng)的D/A轉(zhuǎn)換元件，簡化了電路，并且提高了系統(tǒng)的可靠性。同時，系統(tǒng)可以實時控制電阻爐的實際溫度。
關(guān)鍵詞：熱電偶；晶閘管；單片機

 
Abstract

With the development of the society，the autocontrol becomes more and more important.Theautocontrolof the resistance furnace is highly anticipated.Microcomputer and its application has become one of the most important contents and signs in the field of High-scientific technology and new scientific technology, which plays an attractive role in every field in our national economy.As a matter of fact, Resistance Temperature Control System which is operated by microcomputer is an Intellectual Control System.In other words，it is a Temperature Control System which consumes less than others.
The AT89C51 single microcomputer is adopted to control the heating process of resistance，use as a temperature transducer to turn the heating single into electing single，enlarge the electrical single，transformed through simulate numbers，then input CPU. The principle of temperature control is to adjust and heat the effective voltage of the main circuit through regulate the diversified time of transistor，therefore，it carries out the purpose of controlling the temperature.System as controlled resistance makes up an cycle control system.Control procedure of system adopts the structure of designing module，including main procedure，subsiding of suspending serves and subsidiary of control calculation etc.System adopt A.C、passes through zero etc technologies，omit traditional D/A transform components，simplify the circuit，and improve the dependability of system.Meanwhile，system also can control the real temperature of resistance at the right moment.
Keywords：thermocouple；thyristor；Microcomputer
  目 錄

引言 1
1概述 2
1.1課題研究的背景及意義 2
1.2 國內(nèi)外研究現(xiàn)狀 3
1.3本文的主要內(nèi)容 4
2電阻爐溫度控制系統(tǒng)總體設(shè)計方案 5
2.1系統(tǒng)方案論證 5
2.2系統(tǒng)組成 6
3系統(tǒng)硬件設(shè)計 8
3.1單片機介紹 8
3.2 EEPROM存儲器的擴展 10
3.3溫度檢測電路 12
3.3.1熱電偶冷端溫度補償 13
3.3.2測量放大電路 15
3.3.3保護電路 16
3.4 A/D轉(zhuǎn)換電路設(shè)計 16
3.4.1 AD574芯片介紹 16
3.4.2 AD574與單片機的接口電路設(shè)計 19
3.4.3光電耦合放大器的設(shè)計 19
3.5鍵盤及顯示電路設(shè)計 21
3.5.1鍵盤接口電路設(shè)計 21
3.5.2顯示電路設(shè)計 23
3.6可控硅調(diào)功控溫 24
3.7晶閘管過零檢測與觸發(fā)電路 26
3.8掉電檢測電路 27
3.9電源電路 27
4系統(tǒng)軟件設(shè)計 29
4.1主程序設(shè)計 29
4.2定時中斷服務程序 31
4.3溫度采樣子程序 32
4.4溫度控制子程序 34
4.5顯示子程序 36
4.6 A/D轉(zhuǎn)換子程序 37
4.7鍵盤掃描子程序 38
5結(jié)論 41
致謝 42
參考文獻 43
附錄A譯文文獻 44
附錄B外文文獻 48
附錄C系統(tǒng)原理圖 55
附錄D程序 56