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1、河南城建学院本科毕业设计（论文）毕业设计[论文]题目：基于单片机的数字直流电流源设计学院：电气与信息工程学院专业：电子信息工程II1摘要由于现代科技发展的日新月异，它极大地促进了社会的不断向前发展，而且为高端电子设备的研发提供了新的技术支持。同时，电源充当这些设备的食粮，众所周知，不同的电子元件和线路对电源的大小要求是不同的，所以，我们对其的探索仍是十分的迫切。近些年基于单片机的各种器件的兴起，为数控恒定电流源的研究与开发指明了发展方向。本文系统的介绍了以STC89C52单片机为中心控制器数控电流源的设计方法，并运用仿真软件如Proteus
2、进行了仿真。利用按键设置输出电流，单片机将该电流值送1602液晶屏显示，同时，DACTLC5615把数字量转换由运算放大器输出的模拟电压值，它作为参考电压控制晶体管电流的输出，又有限制电路输入输出的作用。该数控电流源是基于单片机设计的，因此精确度很高，体积小，功耗低等优点。关键词：电流源；STC89C52；LCD显示；Proteus；TLC561539SummaryDuetotherapiddevelopmentofmoderntechnology,whichgreatlypromotedthecontinuousdevelopmentof
3、society,butalsoforthedevelopmentofhigh-endelectronicequipmentprovidesanewtechnicalsupport.Atthesametime,serveasafoodsupplyforthesedevicesiswellknown,differentelectroniccomponentsandcircuitsizeofthepowersupplyrequirementsaredifferent,soweexploreitremainsveryurgent.Inrecenty
4、earstheriseofavarietyofdevicesbasedonsingle-chipmicrocomputer,astheresearchanddevelopmentofnumericalcontrolconstantcurrentsourcepointedoutthedevelopmentdirection.SysteminthispaperareintroducedtheSTC89C52microcontrollerasthecentercontrollerdesignmethodofnumericalcontrolcurr
5、entsource,andhascarriedonthesimulationusingthesimulationsoftwaresuchasProteus.UsingthecurrentvalueSettingsoutputcurrent,MCUsend1602LCDscreendisplay,atthesametime,withTLC5615d/aconvertertoconvertdigitaltoanalog,theoutputreferencevoltage,throughtheop-ampTLC5615Thisarticledes
6、cribesthesystemasacentralcontrollertoSTC89C52microcontrollerdigitallycontrolledcurrentsourcedesignmethodsandtheuseofsimulationsoftwaresuchasProteussimulation.Usebuttonstosettheoutputcurrent,thecurrentvalueissenttothemicrocontroller1602LCDscreendisplay,while,DACTLC5615analo
7、gtodigitalconverteroutputvoltagefromtheoperationalamplifier,whichisusedasareferencevoltagecontroltransistorcurrentoutput,butalsolimittheinputandoutputcircuitsrole.Thedigitallycontrolledcurrentsourceisbasedonthesingle-chipdesign,thereforehighaccuracy,smallsize,lowpowerconsu
8、mption.Thenumericalcontrolcurrentsourceisbasedonmicrocontrollerdesign,sotheaccuracyishigh
