外文翻译---基于STM32的恒温箱温度控制系统Word文档格式.docx

外文翻译---基于STM32的恒温箱温度控制系统Word文档格式.docx

《外文翻译---基于STM32的恒温箱温度控制系统Word文档格式.docx》由会员分享，可在线阅读，更多相关《外文翻译---基于STM32的恒温箱温度控制系统Word文档格式.docx（8页珍藏版）》请在冰豆网上搜索。

）,Shi-guangLI（·

）,Zheng-zhongGAO（·

）,XuZHANG（ ）,Yu

RUI（ ）

（SchoolofInformationandElectricalEngineering,ShandongUniversityofScienceandTechnology,Qingdao266510,China）

Abstract-thispaperintroducedathermotanktemperaturecontrolsystembasedonSTM32,Firstly,thetemperatureacquisitionisrealizedbythehigh-precisionelectricalbridgebasedon constant current source. Then theaugmentedPIDalgorithmrealizedbysoftwareisadoptedButterworthfilterisusedtoconverttheoutputPWMofSTM32tocurrentsignalwhichisusedtocontrolthesemiconductorcontrolrectifiertoadjustthetemperature.Calibrationcheckandpracticalapplicationbothindicatedthatthesystemwasreliable,high-precision,practicableandcouldmeetrealityneeds.

Keywords-STM32;

thermotank;

temperatureacquisition;

PID

ManuscriptNumber:

1674-8042（2011）01-0064-03

Dio:

10.3969/j.issn.1674-8042.2011.01.16

1introduction

Thermotankcanbedividedintolowtemperaturethermotankandhightemperaturethermotankaccordingtotemperaturerange.Heatingcontrolthermotankisonekindofhightemperaturethermotankandhasawiderangeofapplicationsinindustrial,medicalandscientificareas.Assomespecialthermotankcontrolsystemrequirehighprecisionintemperatureacquisitionandcontrol,thesystemdesignedinthispapercanmeasuretemperaturesfrom16℃to80℃andits

precisionissuperiorto±

0.05℃.AsARMis

graduallyoccupyingthemicroelectronicsmarketforitspowerfulfunctionandlowcost,itisofimportantpracticalsignificanceandvaluetodesignatemperaturecontrolsystembasedonARMwithhighprecision,simplestructureandlowcost.

2Basiccontrolprinciplesofthermotank

Inthissystem,temperatureacquisitionoftheinnerthermotankisrealizedbyusingplatinumresistanceastemperaturesensorandbridgecircuitbasedonconstantcurrentsource.Thencomparetheactualtemperaturewiththetemperaturesetbytouchscreen.ByusingaugmentedPIDalgorithmtoadjust,STM32outputs16-bitPWMsignals.ThenconvertPWMsignaltovoltagesignaltocontroltheconductionangleofSemiconductorControlRectifier（SCR）whichcontrolstheheatingtubes.SystemcontrolprincipleisshowninFig.1.

Consideringthesystemaccuracyandstabilityrequirements,featuresofthissysteminclude:

powerfulandhighspeedARMSTM32F103asthecontroller,augmentedPIDalgorithm,andfulluseofon-chipresourcesofmicrocomputersuchasADC,USARTand16-bitPWMoutputforgreatcontrolaccuracy.

Fig1Systemcontrolprinciple3hardwaredesign

Thissystemincludestemperatureacquisitionbridgecircuit,STM32F103,colorLCDtouchscreencontrolcircuit,filteringcircuitandSCR.Inaddition,thesystemhasagoodman-machineinteractionfunctionandcanrealizereal-timemonitoringandcontrolbyusing5.6inchescolorLCDandtouchscreen.TemperaturecontrolsystemstructureisshowninFig.2.

Fig2Systemstructure

3.1temperatureacquisitionandA/Dconversion

Amongthethermalresistancetemperaturesensors,platinumresistance,withadvantageashighprecision,stableperformance,corrosionresistanceandeasytouse,istheidealtemperatureacquisitioncomponentwidelyusedinindustrialenvironmentsandcontrolsystems.Asthetemperatureacquisitionrangeis16℃to80℃,Pt1000ischosenastemperaturesensor,whichresistancechangeswithtemperatureaccordingtocertainrulesandhasgoodhighprecisionandstableperformance.

Unbalanced bridge measurement istypicalindetectcircuitsusingplatinumresistanceastemperaturesensors[1].However,thenonlinearitybetweenplatinumresistanceand temperature and nonlinearity ofunbalancedbridgeleadtoacquisitionerror,thusweimprovedthetemperatureacquisitionbridgecircuit.Useconstantcurrentsourcetopowerthebridge,connectthetwobridgearmswithpreciseoperationalamplifierthatislownoiseandlowtemperaturedrift,use4DH2toconstituteconstantcurrentsourcecircuitwhichoutputs0.5Acurrent,thusthecurrentinplatinumresistanceisequaltoconstantcurrentsource.

TheADCofSTM32F103isusedtoconvertanalogvoltageoftemperatureintodigitalsignal.The12-bitADCisasuccessiveapproximationanalog-to-digitalconverterandhasthefunctionofself-calibration.D/Dconversionofeachchannelcanbeperformedinsingle,continuous,scanordiscontinuousmode,andinthissystemweusecontinuousmode.TheresultofADCisstoredinright-aligned16-bit data register whichimprovestheconversionspeed.Inaddition,theanalogwatchdogfeatureallowstheapplicationtodetectiftheinputvoltagegoesoutside the user-defined high or low

thresholds.

3.2TM32F103on-chipresourcesTM32F103canworkin-40℃~105℃

andthismeetstherequirementsofindustrialenvironment.