關(guān)于恒流源電路的研究與幾種設(shè)計方案

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1、關(guān)于恒流源電路的研究與幾種設(shè)計方案關(guān)鍵詞：晶體管恒流源；場效應(yīng)管恒流源；集成運放恒流源；輸出電流；開關(guān)恒流源；場效應(yīng)管；穩(wěn)壓器；開關(guān)恒流源；數(shù)控直流恒流源；SPCE061A；單片機。中文摘要本文首先從恒流源基本概念，基本電路開始分類，將恒流源電路概括為三大類。然后針對具體的思路進行設(shè)計。設(shè)計出運放構(gòu)成的線性恒流源、采用開關(guān)電源的開關(guān)恒流源、集成穩(wěn)壓器構(gòu)成的開關(guān)恒流源等三類恒流源電路，并針對單片機設(shè)計了一種數(shù)控恒流源電路，這中電路主要是運用SPCE061A單片機，并以SPCE061A為核心控制器，對整個恒流源電路進行控制。主要運行過程是：SPCE061A單片機送出相應(yīng)的

2、數(shù)字信號，經(jīng)過D/A轉(zhuǎn)換、信號放大、電平轉(zhuǎn)換、壓控恒流源，再輸出所需電流；實際輸出的電流經(jīng)過精密電阻變成取樣電壓信號，經(jīng)高輸入阻抗放大器、A/D轉(zhuǎn)換器，將信號反饋到凌陽SPCE061A單片機中構(gòu)成閉環(huán)控制；通過液晶顯示器顯示此信號的值A(chǔ)boutpermanentcurrentsourceelectricircuitcertainquestionsresearchElectronicinformationprojectGrad2003ZhangYinGeKeyword:Transistorpermanentcurrentsource;Fieldeffecttubeper

3、manentcurrentsource;Theintegrationtransportsputsthepermanentcurrentsource;Outputcurrent;Switchpermanentcurrentsource;Fieldeffecttube;Manostat;Switchpermanentcurrentsource;Numericalcontroldirectcurrentpermanentcurrentsource;SPCE061A;Monolithicintegratedcircuit.AbstractThisarticletellabou

4、tpermanentcurrentsourcebasicconceptatFirst,andsayaboutThebasicelectriccircuitstarts.Thepermanentcurrentsourceelectriccircuitsummaryisthreebigkinds.andthan.Carriesonthedesigninviewoftheconcretementality.DesignsThreekindofpermanentcurrentsourceselectriccircuits,isTheoperationalamplifierco

5、nstituteslinearpermanentcurrentsource、Usestheswitchingpowersupplytheswitchpermanentcurrentsource、Integratesswitchpermanentcurrentsourcewhichthemanostatconstitutesandsoon.Hasdesignedonekindofnumbercontrolpermanentcurrentsourceelectriccircuitinviewofthemonolithicintegratedcircuit.Inthisth

6、eelectriccircuitmainlyutilizestheSPCE061Amonolithicintegratedcircuit，AndtakeSPCE061Aasthecorecontroller.Carriesonthecontroltotheentirepermanentcurrentsourceelectriccircuit.Themainmovementprocessis:TheSPCE061Amonolithicintegratedcircuitsendsoutthecorrespondingdigitalsignal,Transforms,the

7、signalafterD/Aenlarges,theleveltransforms,thevoltagecontrolpermanentcurrentsource,againoutputsneedstheelectriccurrent;TheactualoutputelectriccurrentpassesthroughtheprecisionresistortoturnthesamplingvoltagesignalAfterthehighinputimpedanceamplifier,theA/Dswitch,feedbackthesignalt