重庆大学本科学生毕业设计（论文）LED驱动电源设计专业：电气工程与自动化重庆大学电气工程学院二O一一年六月GraduationDesign(Thesis)ofChongqingUniversityDesignofDriverPowerforLEDUndergraduate:ZhouHaoSupervisor:Prof.TangZhideMajor:ElectricEngineering&AutomationSchoolofElectricEngineeringChongqingUniversityJune2011重庆大学本科学生毕业设计（论文）中文摘要PAGE\*MERGEFORMATII摘要该文针对LED驱动电源的设计需要，先简述了LED及其驱动电源的基本情况，包括BUCK电路及其控制电路的工作原理、稳定性分析等。然后以UC3843电流控制芯片和BUCK电路为基础，设计出了一款车用LED驱动电源，并通过仿真实验，对电路进行了检验。文中详细介绍了UC4843的使用方法、该驱动电源的设计步骤以及具体参数计算。这款驱动电路工作在12V直流电压下，以BUCK电路为主电路，采用峰值电流控制模式，按照PWM调制方法，对两颗串联的LED进行供电，实现了恒流输出、欠压保护、过载保护、空载保护、斜坡补偿等功能，并且在仿真实验中均体现出了各部分的作用。这款LED驱动电源工作稳定，抗干扰能力强，输入范围广，输出电流平稳；通过简单改变供电方式，此电路还能用于不同领域。另外该文还对仿真实验结果进行了较为详细的分析，对补偿斜坡尾部上翘、电流采样电阻的至畸作用进行了讨论。关键词：驱动电源，峰值电流控制，PWM，LED，UC3843重庆大学本科学生毕业设计（论文）ABSTRACTABSTRACTThisarticleforthepurposeofthedesignneedsofLEDdriverpower,firstlysummarizingbrieflythebasicinformationofLEDanditsdriverpower,includingBUCKcircuitaswellasitsworkingprinciplesofcontrolcircuit,thestabilityanalysisetc.ThenbasedontheUC3843electriccurrentcontrol-chipandBUCKcircuit,avehicleLEDdriverpowerhasbeendesigned,anditselectriccircuithasbeentestedthroughthesimulationexperiments.ThisarticledescribestheusagesoftheUC4843,thedesignprocessofthedrivercircuitandthespecificparametercalculationindetail.Thisdriverpowerworksat12VDCvoltage,withBUCKcircuitasthemaincircuit,adoptingthecontrolmodeofpeakcurrent,inaccordancewiththePWMmodulationmethod,providingpowertotwoseriesconnectionsofLED,bringingaboutthefunctionsofunder-voltageprotection,overloadprotection,idle-loadprotection,slopecompensation,andreflectingtheirrespectivefunctionsinthesimulationexperiments.ThisLEDdriverpowerworksstably,withstronganti-interferenceability,wideinputrange;stableoutputcurrent;bychangingthewayofpowersupply,thecircuitcanalsobeusedindifferentfields.Inaddition,thisarticlealsocarriedonamoredetailedanalysisofthesimulationexperimentresults,andcarriedoutthediscussionofabnormalfunctionsabouttheupturnedslopecompensati