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1、大學(xué)本科學(xué)生畢業(yè)設(shè)計(jì)（論文）LED驅(qū)動(dòng)電源設(shè)計(jì)學(xué)生：周灝學(xué)號(hào)：20073682指導(dǎo)教師：唐治德專(zhuān)業(yè)：電氣工程與自動(dòng)化大學(xué)電氣工程學(xué)院二O一一年六月GraduationDesign(Thesis)ofChongqingUniversityDesignofDriverPowerforLEDUndergraduate:ZhouHaoSupervisor:Prof.TangZhideMajor:ElectricEngineering&AutomationSchoolofElectricEngineeringChongqingUniver
2、sityJune2011摘要該文針對(duì)LED驅(qū)動(dòng)電源的設(shè)計(jì)需要，先簡(jiǎn)述了LED及其驅(qū)動(dòng)電源的基本情況，包括BUCK電路及其控制電路的工作原理、穩(wěn)定性分析等。然后以UC3843電流控制芯片和BUCK電路為基礎(chǔ)，設(shè)計(jì)出了一款車(chē)用LED驅(qū)動(dòng)電源，并通過(guò)仿真實(shí)驗(yàn)，對(duì)電路進(jìn)行了檢驗(yàn)。文中詳細(xì)介紹了UC4843的使用方法、該驅(qū)動(dòng)電源的設(shè)計(jì)步驟以及具體參數(shù)計(jì)算。這款驅(qū)動(dòng)電路工作在12V直流電壓下，以BUCK電路為主電路，采用峰值電流控制模式，按照PWM調(diào)制方法，對(duì)兩顆串聯(lián)的LED進(jìn)行供電，實(shí)現(xiàn)了恒流輸出、欠壓保護(hù)、過(guò)載保護(hù)、空載保護(hù)、斜坡補(bǔ)償?shù)?/p>
3、功能，并且在仿真實(shí)驗(yàn)中均體現(xiàn)出了各部分的作用。這款LED驅(qū)動(dòng)電源工作穩(wěn)定，抗干擾能力強(qiáng)，輸入圍廣，輸出電流平穩(wěn)；通過(guò)簡(jiǎn)單改變供電方式，此電路還能用于不同領(lǐng)域。另外該文還對(duì)仿真實(shí)驗(yàn)結(jié)果進(jìn)行了較為詳細(xì)的分析，對(duì)補(bǔ)償斜坡尾部上翹、電流采樣電阻的至畸作用進(jìn)行了討論。關(guān)鍵詞：驅(qū)動(dòng)電源，峰值電流控制，PWM，LED，UC3843ABSTRACTThisarticleforthepurposeofthedesignneedsofLEDdriverpower,firstlysummarizingbrieflythebasicinformatio
4、nofLEDanditsdriverpower,includingBUCKcircuitaswellasitsworkingprinciplesofcontrolcircuit,thestabilityanalysisetc.ThenbasedontheUC3843electriccurrentcontrol-chipandBUCKcircuit,avehicleLEDdriverpowerhasbeendesigned,anditselectriccircuithasbeentestedthroughthesimulation
5、experiments.ThisarticledescribestheusagesoftheUC4843,thedesignprocessofthedrivercircuitandthespecificparametercalculationindetail.Thisdriverpowerworksat12VDCvoltage,withBUCKcircuitasthemaincircuit,adoptingthecontrolmodeofpeakcurrent,inaccordancewiththePWMmodulationme
6、thod,providingpowertotwoseriesconnectionsofLED,bringingaboutthefunctionsofunder-voltageprotection,overloadprotection,idle-loadprotection,slopecompensation,andreflectingtheirrespectivefunctionsinthesimulationexperiments.ThisLEDdriverpowerworksstably,withstronganti-int
7、erferenceability,wideinputrange;stableoutputcurrent;bychangingthewayofpowersupply,thecircuitcanalsobeusedindifferentfields.Inaddition,thisarticlealsocarriedonamoredetailedanalysisofthesimulationexperimentresults,andcarriedoutthediscussionofabnormalfunctionsabouttheup
8、turnedslopecompensationanddisruptionofthecurrentsampling.Keywords：Driverpower，Peakcurrentmodecontrol，PWM，LED，UC3843目錄中文摘要ⅠABSTRACTⅡ
