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1、摘要本文介紹了一種開(kāi)環(huán)智能數(shù)控直流電流源的設(shè)計(jì)原理和實(shí)施方案，該方案采用D/A(MAX531)轉(zhuǎn)換器、運(yùn)算放大器等器件來(lái)控制場(chǎng)效應(yīng)管導(dǎo)通狀態(tài)的原理，達(dá)到了輸岀恒流的目的。整個(gè)系統(tǒng)采用AT89S52單片機(jī)作為主控部件，將預(yù)置電流值數(shù)據(jù)送入D/A轉(zhuǎn)換器(MAX531),經(jīng)碩件電路變換為恒定的直流輸出，同時(shí)采用基本沒(méi)有溫度漂移的康猛銅電阻絲作為精密采樣電阻。采用性能優(yōu)丁?普通品體管的場(chǎng)效應(yīng)管作為恒流源的主要部件，大功率品體管作為擴(kuò)流電路的主要器件，結(jié)合三端穩(wěn)壓管和多層濾波使得整個(gè)系統(tǒng)性能捉升了一個(gè)層次，從而實(shí)現(xiàn)了高精度恒流源的目的。系統(tǒng)述對(duì)輸出
2、電壓進(jìn)行實(shí)時(shí)采樣，通過(guò)A/D轉(zhuǎn)換器采樣回單片機(jī)與用戶給定的限壓值進(jìn)行比較，從而監(jiān)控了輸出電壓。同時(shí)通過(guò)鍵盤(pán)的控制，實(shí)現(xiàn)了輸出電流值和限壓值可預(yù)置，可步進(jìn)調(diào)整、輸出的電流信號(hào)和電壓信號(hào)可直接數(shù)字顯示的功能，并具有輸出電壓實(shí)時(shí)監(jiān)控限壓報(bào)警并自動(dòng)降低輸出電流等功能。與以往的直流恒流源相比，此次所設(shè)計(jì)的恒流源具冇精度高、結(jié)構(gòu)簡(jiǎn)單、工作穩(wěn)定、操作方便、成本低廉、帶負(fù)載能力強(qiáng)等優(yōu)點(diǎn)。關(guān)鍵詞：恒流源AT89S52單片機(jī)MAX531MAX187AbstractThispaperintroducesasmartNCopen-loopDCcurrentsou
3、rcedesignprincipleandtheimplementationoftheprogramme,usingtheD/A(MAX531)converters,opamp,andotherdevicestocontrolFETon~stateprinciple,theoutputreachedconstantcurrentpurposes.AT89S52theentiresystemusesasingle-chipmicrocomputercontrolcomponents,preferencescurrentvaluedatawi
4、llbesenttotheD/Aconvetters(MAX531),thehardwarecircuitfortheconstanttransformationofDCoutput,butnotusingthebasictemperaturedriftConcordManganinresistorSilkasasophisticatedsamplingresistor.PerformanceisbetterthantheordinaryuseoftheFETtransistorasaconstantcurrentsourceofmajo
5、rcomponents,high-powertransistotsasexpandingthemaincircuitdevice,thecombinationofthree-terminalregulatorsandthemulti-f訂termakesthewholesystemaperformanceboostlevelstoachieveahigh-precisionconstantcurrentsourcepurposes.Outputvoltageofthesystemtoconductreal-timesampling,thr
6、oughtheA/DconverterswithsamplingtoMCUuserstosetlimitvaluestocomparepressuretocontroltheoutputvoltage.Atthesametime,thekeyboardcontrolandrealizedthevalueofoutputcurrentandvoltage-limitingvaluescanbepreset,steppingadjustment,thecurrentsignalandtheoutputvoltagesignalcanbedir
7、ectlyfiguresshowthatthefunction,andreal-timemonitoringoftheoutputvoltage,suchasover-voltagealarmfunction.InthepastcomparedtoDCcurrentsource,thedesignofahigh-precisionconstantcurrentsource,simplestructureandworkstability,andeasytooperate,lowcost,withapayloadcapacity,andoth
8、eradvantages.Keywords:CurrentsourceAT89S52MCUMAX531MAX187目錄摘要I刖呂1第一章系統(tǒng)結(jié)構(gòu)及功能介紹21.1系統(tǒng)工作原理概述21?2系統(tǒng)的
