优秀毕设论文范例

毕业设计(论文)说明书题目：院（系）：信息与通信学院专业：通信工程学生姓名：学号：指导教师：胡煜职称：讲师题目类型：理论研究实验研究工程设计工程技术研究软件开发2011年5月15日√桂林电子科技大学毕业设计（论文）报告用纸摘要为了方便，快速地调节电压，本文章将介绍一种基于单片机的数控稳压电源的设计方法。基于单片机的数控稳压电源的电路结构简单，取材也比较容易。系统主要是由单片机，D/A转换，集成运放以及若干的三极管、电阻电容组合而成。设计中使用单片机来控制输出电压的，在输出端运用小电阻来采样电压，利用单片机内部的ADC进行A/D转换，进而用软件来计算输出电流，同时使用1602液晶显示输出电流和电压大小。在数控电源输出级的电流放大处放置一个温度传感器来实时监控系统温度，当系统温度过高时候，数控电源自动切断输出。通过实践可以知道，采用该方法设计的数控电源具有精确度高，调节方便，读数直观，电路结构简单等优点。通过对课题的研究，使用了STC12C5A08S2单片机，DAC082数模转换器和1602液晶模块等元器件来设计以达到数控稳压电源的目的。在本设计中，通过键盘来调节单片机的输出数字量，然后经行D/A数模转换，放大稳压后输出与单片机输出数字量相应的电压值。在输出端经过采样后，由软件程序计算系统输出的电流大小，并送去液晶显示。整个系统主要的可以分为三个大部分：供电部分，控制部分和稳压输出部分。关键词：单片机；数控；稳压电源桂林电子科技大学毕业设计（论文）报告用纸AbstractInordertoeasilyandquicklyadjustthevoltage,thearticledescribesamicrocontroller-baseddesignmethodforNCpowersupply.NC-basedMicrocontrollerregulatedpowersupplycircuitstructureissimple,drawingeasier.Systemismainlybythemicrocontroller,D/Aconversion,integratedoperationalamplifierandanumberofthetransistors,resistorscapacitorcombination.Inthedesign，Microcontrollerusedforcontroltheoutputvoltage,theoutputvoltagewithlowresistancetosampling,theADCfortheinternaluseofmicrocontrollerA/Dconversion,andthenusesoftwaretocalculatetheoutputcurrent,alsoshowsthesizeoftheoutputcurrentandvoltageinthe1602LCD.NCpoweroutputstageofthecurrentamplificationbyplacingatemperaturesensortoreal-timemonitoringsystemtemperature,thetimewhenthesystemtemperatureistoohigh,CNCautomaticallycutpoweroutput.Throughpracticeyoucanknow,usingthepowerofthemethodofhighprecisionNCdesign,easyadjustment,intuitivereadings,andsimplecircuitstructure.Throughresearchprojects,usingSTC12C5A08S2microcontroller,DAC082Dand1602LCDmoduleandsooncomponentstodesigntheNCpowersupply.Inthisresearch,thekeyboardtoadjusttheoutputofdigitalsinglechip,andthenbythelineD/Adigital-analogconverter,amplifiedvoltageoutputandtheMCUafterthecorrespondingvoltageoutputdigitalvalue.Aftersamplingattheoutput,bythesoftwareprogramtocalculatethecurrentsizeofthesystemoutputandsenttoLCDdisplay.Thewholesystemcanbedividedintothreemainparts:powersupplypart,controlpartandoutputpartoftheregulator.Keywords:Microcontroller;NC;Stablevoltagesource桂林电子科技大学毕业设计（论文）报告用纸目录引言························································································11绪论····················································································12方案论证与比较·····································································23硬件系统的设计·····································································34硬件电路中使用的主要元器件介绍·············································44.1STC12C5A08S2单片机的介绍····································································44.2数字/模拟（D/A）转换芯片介绍································································54.31602液晶显示模块简介············································································64.4运算放大器的简介··················································································74.5其他元器件···························································································75单元电路设计········································································75.1供电电路的设计·····················································································75.1.1主电源电路设计···················································································85.1.2辅助电源的设计···················································································85.2单片机最小系统电路的设计······································································95.3键盘和显示电路的设计············································································95.4数字/模拟转换电路的设计·······································································105.5放大稳压电路的设计··············································································115.6电流检测和保护电路的设计·····································································125.6.1电流检测和过流保护电路设计································································125.6.2过压保护电路的设计············································································135.6.3过热保护电路的设计············································································135.7指示信息电路·······················································································136软件程序的系统设计·····························································147电路的制作与调试································································147.1电路系统的制作····················································································147.2供电电路的调试····················································································147.3单片机程序的调试·················································································177.3.11602液晶驱动和初始化程序的调试··························································177.3.2DS18B20温度传感器程序的调试·····························································187.3.3键盘检测程序的调试············································································19桂林电子科技大学毕业设计（论文）报告用纸7.3.4数字/模拟转换控制程序的调试·······························································207.3.5单片机内部ADC的程序调试·······················