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1、摘要隨著電子技術的不斷進步,對電子儀器的要求也不斷提高。電源作為電路的動力源泉更是扮演著越來越重要的角色,不論是學校實驗室還是維修中心都離不開實驗電流源,然而傳統(tǒng)的電流源不論是在控制精度還是輸出特性上都無法滿足要求。隨著單片機技術的不斷發(fā)展和D/A,A/D技術的不斷成熟使得數控電源成為可能,數控電流源不論是在控制精度還是在可操作性上都有傳統(tǒng)電源無法比擬的優(yōu)勢。本文在參考傳統(tǒng)電流源以及普通數控電流源的基礎上,在充分考慮性價比的同時極大地提高了數控電流源的準確性,通過軟件修正以后在使用普通元件的情況下數控
2、電流源的性能也達到了比較高的水平。關鍵字:高精度;DAC0832;D/A轉換;恒流源;軟件修正29AelectriccurrentsourceofmachinecontrolbasedOnsingle-chipmicrocomputerStudent:CUIlingteacher:CHENXiao-qinAbstract:Progressunremittinglytherequesttotheelectronicsinstrumenttechnicallytoalsoraisecontinuously
3、alongwiththeelectronics,thepowersupplyisthemotivesourceoftheelectriccircuittoplayamoreandmoreimportantrolemore,istheschoolalaboratorystillrepaircentersestoallcannotgetawayfromanexperimentpowersupplyinspiteof,howeverthetraditionalpowersupplyiscontrolaccu
4、racyoroutputthetopsofthecharacteristicinspiteofandcan'tsatisfyarequest.AlongwithsingleslicemachinetechnicalofdevelopcontinuouslywiththeD/A,theA/Distechnicalcontinuouslythematuritymakethenumbercontrolpowersupplytomakepossible,counttocontroltheelectriccur
5、rentsourceandiscontrolaccuracyinspiteofstillonthemaneuverabilityallthereistraditionalpowersupplycan'tcomparetoofadvantage.Thistextinmakingreferencetothefoundationthatthetraditionalelectriccurrentsourceandcommonnumbercontroltheelectriccurrentsource,atthe
6、fullconsiderationpricecompareofinthemeantimeraisedanumbertocontroltheaccuracyoftheelectriccurrentsourcebiggest,passthesoftwarecorrectionhereafterwhileusethecircumstanceofthecommoncomponentthenumbercontrolstheelectriccurrentsourceofthefunctionalsocomesto
7、ahigherlevel.Keywords:Highaccuracy;DAC0832;D/Aconverter;Constant;currentresource29目次摘要IAbstractII1.緒論11.1.電流源簡介11.2.數控電流源的必要性11.3.數控電流源的可行性12.數控電流源硬件系統(tǒng)總體設計22.1.傳統(tǒng)電流源的設計方案22.2.數控電流源方案22.3.數控電流源的方案比較32.4.電流源的軟件系統(tǒng)組成42.5.本系統(tǒng)的特點53.數控電流源硬件模塊設計63.1.電源模塊63.1.1.
8、電源原理63.1.2.電源方案確定73.1.3.電源模塊具體電路83.1.4.電源模塊PCB設計83.1.5.顯示模塊83.2.D/A電路103.2.1.DAC0832簡介103.2.2.具體電路設計123.2.3.控制電壓產生電路133.3.電流輸出模塊143.3.1.具體電路圖153.3.2.電流輸出模塊Pcb圖163.4.主控部分163.4.1.AT89C52單片機系統(tǒng)及外圍電路163.4.2.單片機時鐘脈沖電路16293.4.3.復位電路163.