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1、長(zhǎng)春工業(yè)大學(xué)學(xué)士學(xué)位論文畢業(yè)論文數(shù)控直流恒流源設(shè)計(jì)46長(zhǎng)春工業(yè)大學(xué)學(xué)士學(xué)位論文摘要本設(shè)計(jì)基于開關(guān)電源的工作原理，主體DC-DC變換電路采用Buck降壓斬波電路，通過負(fù)載電流反饋，控制UC3843峰值電流模式控制器控制Buck變換器的占空比來實(shí)現(xiàn)負(fù)載電流的恒定。該設(shè)計(jì)電路主要包括單片機(jī)控制電路，DC-DC變換電路，穩(wěn)流反饋電路，負(fù)載電流測(cè)量電路，基于PWM的電壓輸出DAC電路，基于A/D的鍵盤電路和過流保護(hù)電路。本數(shù)控直流恒流電源，輸出電流范圍0mA—1000mA，其步進(jìn)值為10mA，效率較高。其中單片機(jī)采用了宏晶公司的增強(qiáng)型51單
2、片機(jī)STC12C5A32S2，內(nèi)部有8路10位A/D，有專用的SPI模塊，可以直接與ADC變換器通信，省去了軟件模擬時(shí)序的麻煩。在軟件部分，除了流程圖以外，還分析了C語言編譯原理。關(guān)鍵詞：Buck，UC3843，反饋電路，數(shù)控直流恒流電源46長(zhǎng)春工業(yè)大學(xué)學(xué)士學(xué)位論文AbstractSwitchingpowersupplywithpowersemiconductordevicesasswitches,thedutycyclemodulatedbycontrollingtheswitchoutputvoltage.Thepowertr
3、ansistor(GTR),forexample,whentheswitchissaturatedconduction,thecollectorandemittervoltagedropclosetozeroatbothends;Whentheswitchisclosing,itscollectorcurrentiszero.Soitspowerconsumption,efficiencycanbeashighas70%to95%.Thelowpowerconsumption,heatsinkalsodecreases.Switc
4、hingpowersupplydirectlytotherectifiedmainsvoltage,filter,adjustment,andthenadjustthetubevoltagebytheswitch,nopowertransformerThedesignisbasedonswitchingpowersupplyworks,theDC-DCconverterwithBuckbuckchoppercircuit,throughtheloadcurrentfeedback,controlthepeakcurrent-mod
5、econtrollerUC3843Buckconverterdutycycletoachieveaconstantloadcurrent.Thedesigncircuitincludesasinglechipcontrolcircuit,DC-DCconversioncircuit,constantcurrentfeedbackcircuit,theloadcurrentmeasurementcircuit,basedonthePWMvoltageoutputDAC,basedonA/Dkeyboardcircuitandover
6、-currentprotectioncircuit.ThenumericalcontrolconstantcurrentDCpowersupply,outputcurrentrangeof0mA-1000mA,thestepvalueof10mA,efficiencyishigher.Microcontrollerwhichusesthecompany'senhancedmacrocrystal51MCUSTC12C5A32S2,internal8-channel10-bitA/D,adedicatedSPImodulecanco
7、mmunicatedirectlywiththeADCconverter,eliminatingtheneedforsoftwaretosimulatethetimingofthetrouble.Inthesoftwarepart,inadditiontoflow,italsoanalyzestheClanguagecompilertheory.朗讀顯示對(duì)應(yīng)的拉丁字符的拼音?字典Keywords:Buck,UC3843,feedbackcircuit,NCdcconstantcurrentpowersupply朗讀顯示對(duì)應(yīng)的拉丁字
8、符的拼音?字典46長(zhǎng)春工業(yè)大學(xué)學(xué)士學(xué)位論文目錄摘要IAbstractII目錄III第一章緒論11.1開關(guān)電源的基本構(gòu)成1第二章硬件電路設(shè)計(jì)和原理22.1電源設(shè)計(jì)22.2主體變換電路的設(shè)計(jì)32.2.1模擬設(shè)計(jì)方案32.2.2電力電子設(shè)計(jì)方案42.3P
