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1、哈尔滨理工大学学士学位论文哈尔滨理工大学毕业设计题目:基于热电偶的控温器设计院系:电气与电子工程学院2013年6月21日-IV-哈尔滨理工大学学士学位论文基于热电偶的控温器设计摘要热电偶(thermocouple)是温度测量仪表中常用的测温元件,它直接测量温度,并把温度信号转换成热电动势信号。各种热电偶的外形常因需要而极不相同,但是它们的基本结构却大致相同,通常由热电极、绝缘套保护管和接线盒等主要部分组成。本文研究开发的抗干扰热电偶控温器,从电路设计、PCB电路板布局布线、到软件设计等方面,对热电偶工作的干扰信号进行滤波处理,使这一热
2、电偶控温器能够在复杂的电磁环境下稳定、可靠地工作。为了达到提高测温精度的目的,需要对热电偶进行冷端补偿,以弥补热电偶冷端处于室温环境时造成的误差;在PCB电路设计中,从电源、电缆、印制板三个层次对热电偶控温器进行抗干扰设计;在软件设计过程中,利用数字滤波技术进一步对干扰信号滤波处理、并用线性插值法求解温度值,最后用模糊算法实现控温器对环境温度的控制。关键词 热电偶;冷端补偿;控温器;抗干扰-IV-哈尔滨理工大学学士学位论文ADesignofThermocoupleBasedTemperatureControllerAbstractTh
3、ermocouple(thermocouple)isacommonlyusedtemperaturesensortemperaturemeasurementinstrument,Itmeasurethetemperaturedirectly,andthetemperaturesignalisconvertedintothethermalelectromotiveforceone.Theshapeofthethermocoupleisnotthesamebecausethedifferentneeds.buttheirbasicstru
4、ctureareroughlythesame,andusuallycomposeofahotelectrode,insulatingsleevetubeprotectorandthejunctionboxandothermainparts.Thisresearchisabouttheresearchofananti-disturbedtemperaturecontrollerwiththermocoupleasitsthermalsensor.Inordertomakethetemperaturecontrollerworkstabl
5、yandreliablyinacomplicatedelectromagneticenvironment,differentmethodsareusedinthedesignstage.Thesemethodscoverdifferentstagesofthedesign,includingthedesignofthehardwarecircuit,thelayoutoftheprintedcircuitboard(PCB),andthesoftwaredesign.Inthedesignofthehardwarecircuit,in
6、ordertoimprovetheaccuracyofthetemperaturecontroller,it’snecessarytodosomeworkonthecoldjunctioncompensation.Becausethethermocoupleisusuallyworkwithitscoldjunctionintheroomtemperatureratherthaninthestandardof0℃.InthePCBdesignstage,threedesignhierarchiesareusedtomakethetem
7、peraturecontrollerimmunetothedisturbanceoftheelectromagneticenvironment,thesehierarchiesinclude:powersupply,electriccable,andtheprintedcircuitboard.Inthesoftwaredesign,thedigitalfilterisusedtofinallyfilterthedisturbsignal,andtheFuzzyalgorithmicapproachisusedtorealizethe
8、thermalcontrol.Keywords Thermocouple;Coldjunctioncompensation;Temperaturecontroller;Anti-disturb-IV-哈尔滨理工大学学士学