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1、數(shù)控直流恒流源的設(shè)計(jì)摘要直流恒流源是提供穩(wěn)定直流電流的電源裝置，是科學(xué)實(shí)驗(yàn)和設(shè)備調(diào)試中的一種必備設(shè)備。本文介紹了采用AT89C51單片機(jī)為主控制器，通過(guò)鍵盤(pán)來(lái)設(shè)置直流恒流源的輸出電流，并由數(shù)碼管顯示電流設(shè)定值的數(shù)控直流恒流源。本系統(tǒng)由單片機(jī)程控設(shè)定數(shù)字信號(hào)經(jīng)過(guò)D/A轉(zhuǎn)換器輸出模擬量，再經(jīng)過(guò)V/I轉(zhuǎn)換電路的轉(zhuǎn)換輸出不同的電流。輸出電流范圍為10～100mA，電流設(shè)置步進(jìn)為1mA，輸出電流調(diào)整率≤2%。本文主要分析了數(shù)控直流恒流源系統(tǒng)的設(shè)計(jì)需求，闡述了數(shù)控直流恒流源的軟硬件的設(shè)計(jì)原則，介紹了數(shù)控直流恒流源各模塊電路的功能及設(shè)計(jì)思路，完成了
2、數(shù)控直流恒流源系統(tǒng)的全部設(shè)計(jì)，給出了完整的電路圖和程序。本文設(shè)計(jì)的重點(diǎn)是單片機(jī)主控系統(tǒng)和D/A轉(zhuǎn)換電路，設(shè)計(jì)的難點(diǎn)是高線性、高穩(wěn)定度的電壓/電流轉(zhuǎn)換電路（V/I轉(zhuǎn)換電路）。測(cè)試結(jié)果表明，本系統(tǒng)能滿足需要高穩(wěn)定度的小功率直流恒流源領(lǐng)域的應(yīng)用要求。關(guān)鍵詞數(shù)控恒流源V/I轉(zhuǎn)換ABSTRACTNumericalcontrolDCconstantcurrentsourceistoprovideastableDCpowerdevices,andequipmentforscientificexperimentsdebuggingnecessarye
3、quipment.ThispaperinstructedthenumericalcontrolDCconstantcurrentsourcewhichmakesuseoftheAT89C51versionsinglechipmicrocontrolleristhemaincontrollerinthissystem,whilethesetvalueandtherealoutputcurrentcanbedisplayedbyLED.Inthissystem,thedigitallyprogrammablesignalfromSingl
4、eChipMicrocontrollerisconvertedtoanalogvaluebyD/Aconverter,andthentransitedbyvoltage/currentconvertercircuit,soadjustableoutputdifferentcurrent.Outputcurrentrangeof10~100mA,currentsetof1mAstep,theoutputcurrentadjustmentrateoflessthan2%.Thispaperanalyzesthenumericalcontr
5、olDCconstantcurrentsourcesystemdesignneeds,expoundednumerical-controlledDCconstantcurrentsourceofthehardwareandsoftwaredesignprinciples,instructedthenumerical-controlledDCconstantcurrentsourcecircuitofthemodulefunctionanddesignideas,completedthenumerical-controlledDCcur
6、rentsourceofalldesign,andthecircuitiscompleteandprocedures.ThispaperfocusesonthedesignofthecontrolsystemmicrocontrollerandD/AConversionCircuit,Thedifficultyinthedesignofhighlinearity,highstabilityofthevoltage/currentconvertercircuit(V/IConversionCircuit).Thetestresultsh
7、aveshowedthatitcanbeappliedinneedareasofconstantcurrentsourcewithhighstabilityandlowpower.KEYWORDSnumericalcontrolconstantcurrentsourceV/Iconvert目錄前言1第1章系統(tǒng)總體設(shè)計(jì)21.1系統(tǒng)設(shè)計(jì)任務(wù)與要求21.1.1系統(tǒng)設(shè)計(jì)任務(wù)21.1.2系統(tǒng)設(shè)計(jì)要求21.2重點(diǎn)研究?jī)?nèi)容與實(shí)現(xiàn)方法21.2.1重點(diǎn)研究?jī)?nèi)容21.2.2實(shí)現(xiàn)途徑及方法31.3系統(tǒng)總體方案設(shè)計(jì)31.3.1主控模塊31.3.2鍵盤(pán)與顯示模
8、塊41.3.3恒流源模塊41.3.4存儲(chǔ)器擴(kuò)展模塊41.3.5電源模塊51.3.6系統(tǒng)原理框圖5第2章系統(tǒng)硬件各功能模塊的設(shè)計(jì)62.1主控模塊的設(shè)計(jì)62.1.1AT89C51單片機(jī)簡(jiǎn)介62.1.2D/A轉(zhuǎn)換電路的設(shè)計(jì)72
