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1、.摘要本设计以AT89S52单片机为核心控制芯片，实现数控直流电源功能的方案。设计采用8位精度的DA转换器DAC0832、三端可调稳压器LM350和一个UA741运算放大器构成稳压源，实现了输出电压范围为＋1.4V～+9.9V，电压步进0.1V的数控稳压电源，最大纹波只有10mV，具有较高的精度与稳定性。另外该方案只采用了5个按键实现输出电压的方便设定，具有设定值调整，微调（步进量0.1），粗调（步进量1）三种调整功能，显示部分我们采用了三位一体的数码管来显示输出电压值。我们自行设计了12V和5V电源为系统供电。该电路的原理是通过MCU控制DA的输出电压大小，通过
2、放大器放大，放大后的电压作为LM350的参考电压，真正的电压还是由电压模块LM350输出。利用5个按钮调整电压、并且通过共阴极三位一体LED显示输出的电压值。设计使用3三位一体数码管，可以显示三位数，一个小数位，比如可以显示5.90V，采用动态扫描驱动方式。与传统的稳压电源相比具有操作方便，电源稳定性高以及其输出电压大小采用数码显示的特点。关键词：数控，步进，三端可调稳压器...ABSTRACTThedesigniswiththeMCUAT89S52forthecorecontrolchip,whichcarryouttheprojectthatthefuncti
3、onofthenumbercontrolsthedirectcurrentpowersupply.DesignedwiththeprecisionofeightDAconverterDAC0832,three-adjustableregulatorsLM350andaUA741OperationalAmplifiersconstituteRegulatorssource,theoutputvoltagerangeof+1.4V~+9.9V,0.1VvoltagestepNCRegulatorsPower,ithaswithhighprecisionandstabi
4、lityandonlyhavethebiggestrippleof10mV.Meanwhile,theprogramusedonlyfivekeystoachievetheconvenienceoftheoutputvoltagesetting,withsettingvalueadjustments.Ithasthreekindsofadjustfunction,whichcancarryoutmicro-adjustment(Steppingvolume0.1)andthecoarseadjustment(Steppingvolume1).Theshowpart
5、wehaveadoptedathree-dimensionaldigitalpipetoshowtheoutputvoltagevalue.Andwedesignedthe12Vand5Vpowersupplysystemforelectricity.TheprincipleofthatelectriccircuitwasthattheoutputvoltagesizewhichpassestheMCUtocontrolDA,passingtheamplifieramplification,andthevoltageisthereferencevoltageoft
6、heLM350.AndtherealvoltageisstilltheLM350outputsarefromthevoltagemoldpiece.Makinguseoffivebuttonstoadjustmentvoltages,andpassthetotalcathodeChristianTrinityLEDtodisplaytheoutput'svoltage.InthisdesignIused3piececodetubes,whichcanshowthreepositionnumbers,oneofthemisafractionposition.fore
7、xample,itcanshowa5.90Vs.InthisdesignIadoptthescantodrivewayisdynamicstatesweep.Withtraditionalsteadypresspowersupplytocomparetohaveanoperationconvenience,thepowersupplystabilityhighcharacteristics,itsexportationelectricvoltagesizeadoptionfiguresshow.Keywords:NumericalControl,Stepping,
8、Three
