资源描述:
《LED驱动电源设计.doc》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、大学本科学生毕业设计(论文)LED驱动电源设计学生:周灏学号:20073682指导教师:唐治德专业:电气工程与自动化大学电气工程学院二O一一年六月GraduationDesign(Thesis)ofChongqingUniversityDesignofDriverPowerforLEDUndergraduate:ZhouHaoSupervisor:Prof.TangZhideMajor:ElectricEngineering&AutomationSchoolofElectricEngineeringChongqingUniver
2、sityJune2011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
3、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,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目录中文摘要ⅠABSTRACTⅡ