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1、大學本科學生畢業(yè)設計(論文)LED驅動電源設計學生:周灝學號:20073682指導教師:唐治德專業(yè):電氣工程與自動化大學電氣工程學院二O一一年六月GraduationDesign(Thesis)ofChongqingUniversityDesignofDriverPowerforLEDUndergraduate:ZhouHaoSupervisor:Prof.TangZhideMajor:ElectricEngineering&AutomationSchoolofElectricEngineeringChongqingUniver
2、sityJune2011摘要該文針對LED驅動電源的設計需要,先簡述了LED及其驅動電源的基本情況,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,設計出了一款車用LED驅動電源,并通過仿真實驗,對電路進行了檢驗。文中詳細介紹了UC4843的使用方法、該驅動電源的設計步驟以及具體參數(shù)計算。這款驅動電路工作在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調制方法,對兩顆串聯(lián)的LED進行供電,實現(xiàn)了恒流輸出、欠壓保護、過載保護、空載保護、斜坡補償?shù)?/p>
3、功能,并且在仿真實驗中均體現(xiàn)出了各部分的作用。這款LED驅動電源工作穩(wěn)定,抗干擾能力強,輸入圍廣,輸出電流平穩(wěn);通過簡單改變供電方式,此電路還能用于不同領域。另外該文還對仿真實驗結果進行了較為詳細的分析,對補償斜坡尾部上翹、電流采樣電阻的至畸作用進行了討論。關鍵詞:驅動電源,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