中文摘要摘要本论文要做的课题是基于虚拟仪器的加热炉温控系统设计，要求加热炉温度稳定在80℃，允许有±1℃的误差。本论文采用美国NI公司虚拟仪器开发软件LabVIEW8.5开发出一套低温电加热炉温度控制系统。系统具体设计方案如下：由传感器测得的炉温信号经过变送环节送给数据采集卡，采集卡对信号进行A/D转换后传输至虚拟仪器，虚拟仪器中的PID算法对信号处理后产生控制信号，再经过采集卡D/A转换后输出控制PWM波产生电路，改变PWM波占空比，产生的PWM波经过光耦MOC3041控制双向可控硅的通断，以此改变加在电阻上的电压，达到温控目的。本论文首先按照上述设计方案设计了硬件电路，接着进行系统软件的设计。经过简单的实验，系统可以正常采集数据并显示。关键词：虚拟仪器，LabVIEW，温控系统，过零调功，PWMIAbstractAbstractThetaskofthispaperistodesignatemperaturecontrolsystembasedonvirtualinstrumentofthefurnace.Andtherequirementsofthefurnacetemperatureisstableat80,allowederrorof±1.℃℃ThispaperadoptedLabVIEW8.5,asoftwaretodevelopthevirtualinstrumentofNIcompanyinAmerica,developedasetoftemperaturecontrolsystemoflow-powerelectricheating.Thesystemdesignareshowedasfollows:thetemperaturesensorssendthesignaloftemperaturechangetothedataacquisitioncardbytransmitter,thenthesignalwillbeconverttodigitalsignalandbesendtothevirtualinstrumentbythedataacquisitioncard,andthenthevirtualinstrumentwilloutputcontrolsignalafterbeprocessedbyPIDalgorithm,andthecontrolsignalwillbeconverttoanalogsignalbythedataacquisitioncardandoutputtocontrolPWMwavesproducecircuittochangethedutycycleofPWMwaves,thenthePWMwaveswillcontrolthebidirectionalthyristorthroughopticalcouplerMOC3041tochangethevoltageinresistancesothatthetemperaturewillbechanged.Thispaperdesignedthehardwarecircuitinaccordancewiththeabovedesignscheme,followedbythedesignofthesystemsoftware.Afterasimpleexperiment,thesystemcanacquireanddisplaythedatasnormally.Keywords:virtualinstrument,LabVIEW,temperaturecontrolsystem,zero-crossingpoweradjustment,PWMII目录目录摘要.........................................................................................................IABSTRACT(英文摘要)...............................................................................Ⅱ目录.........................................................................................................Ⅲ第一章绪论................................................................................................11.1课题的研究的目的和意义.............................................................................11.2国内外发展状况.............................................................................................11.3本设计要做的工作.........................................................................................3第二章虚拟仪器及LabVIEW简介42.1虚拟仪器的基本概念.....................................................................................42.2虚拟仪器的特点及应用.................................................................................42.3LabVIEW的含义...........................................................................................52.4LabVIEW的发展...........................................................................................62.5LabVIEW的结构..........................................................................................62.6LabVIEW的优势...........................................................................................6第三章系统总体方案及硬件电路设计73.1系统总体方...
