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《電子設(shè)計(jì)競(jìng)賽直流穩(wěn)定電源設(shè)計(jì)報(bào)告.doc》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、直流穩(wěn)定電源（A題）設(shè)計(jì)報(bào)告摘要:本設(shè)計(jì)采用單片機(jī)AT89C52作為系統(tǒng)的控制核心,制作了一個(gè)可穩(wěn)定輸出電流或電壓的直流穩(wěn)定電源。設(shè)計(jì)可分為七個(gè)模塊：電源模塊、穩(wěn)壓源模塊、穩(wěn)流源模塊、DC-DC變換器模塊、鍵盤模塊、顯示模塊和系統(tǒng)控制模塊。穩(wěn)壓電源采用串聯(lián)反饋式穩(wěn)壓電路，主要由三端式集成穩(wěn)壓器LM317和運(yùn)算放大器LM324構(gòu)成。穩(wěn)壓電源和負(fù)載構(gòu)成恒流源，并通過程序控制穩(wěn)壓源與穩(wěn)流源電路之間的轉(zhuǎn)換。DC-DC變換器采用雙管自激諧振式振蕩電路，穩(wěn)壓電源輸出的小電壓經(jīng)DC-DC變換器輸出較大的直流電壓。本設(shè)計(jì)可實(shí)現(xiàn)電壓預(yù)置，數(shù)碼顯示輸出電壓和電流，輸出可
2、步進(jìn)（加、減）調(diào)節(jié)，恒壓和恒流電路切換等功能。此外，A/D可將數(shù)據(jù)反饋一次對(duì)誤差進(jìn)行校正，穩(wěn)壓電路具有過熱和過流保護(hù)功能，當(dāng)電路出現(xiàn)故障時(shí)可自動(dòng)恢復(fù)。關(guān)鍵字：鍵盤控制，單片機(jī)，穩(wěn)壓源，穩(wěn)流源，DC-DC變換器AConstantDirectCurrentElectricalSourceAbstract:ADCsource,whichusesamicro-controlunit(MCU)AT89C52asitskernelunit,isdesignedforsupplyingconstantvoltageorconstantcurrent.Thesyst
3、emisconsistofacentercontrolunit,apowersupply,aconstantvoltagesource,aconstantcurrentsource,akeyboardinputunit,adigitaldisplayunit,andaDC-DCunit.AconstantvoltageunitiscomposedoffeedbackconstantvoltagecircuitinseriesbyintegratedchipLM317andaintegratedoperatorLM324.Aconstantcurren
4、tsourceisimplementedbyaconstantvoltagesourceandasamplingresistor,andtheoutputofcurrentorvoltageischosenbyarelevantprogram.TheDC-DCconverterisrealizedbyadouble-tubeself-excitationoscillatingcircuit.TheoutputcanbepredefinedbyMCUkeyboard,changedinstepanddisplayedindigitalbyLED.Mor
5、eover,itcanbeprotectedfromdamageofover-heatandover-burden,andcanberesumedautomaticallyfromill-work.Keywords：keyboardcontrol,microchipcontroller,constantvoltagesource,constantcurrentsource,DC－DCconverter31目錄引言--------------------------------------------------------------31．系統(tǒng)設(shè)計(jì)-
6、---------------------------------------------------31.1設(shè)計(jì)任務(wù)及要求---------------------------------------------31.2總體設(shè)計(jì)方案-----------------------------------------------41.2.1設(shè)計(jì)思路----------------------------------------------41.2.2方案論證與比較----------------------------------------41.2.
7、3系統(tǒng)組成----------------------------------------------82.設(shè)計(jì)實(shí)現(xiàn)--------------------------------------------92.1單元電路設(shè)計(jì)------------------------------------------------92.1.1顯示控制模塊電路設(shè)計(jì)---------------------------------92.1.2電源電路設(shè)計(jì)-----------------------------------------102.1.3穩(wěn)壓電源電路設(shè)計(jì)-
8、------------------------------------122.1.4穩(wěn)流電源電路設(shè)計(jì)---
