DCDCLED驱动电路设计毕业论文.doc

惠州学院 HUIZHOU UNIVERSITY  毕 业 论 文（设 计） 中文题目： DC-DC LED驱动电路设计 英文题目: The DC-DC Driver Cricuit Design of LED 姓 名 周彪平 学 号 080703140 专业班级 电子信息工程1班 指导教师 曹建忠 提交日期 2012年5月19日 教务处制 DC-DC LED驱动电路设计 姓名：周彪平 班级：08级电子信息工程1班 指导老师：曹建忠 职称：教授 (惠州学院系，广东，惠州，516007)The DC-DC Driver Cricuit Design of LED Author： Zhou Biaoping Major：lectronic Information Engineering Teacher：Cao Jianzhong Title：professor (Electronic Science Deparment of Huizhou University，，，516007)Abstract With the widespread use of high-power LED in the lighting and decoration ,the driver circuit design of high-power LED is becoming increasingly important. Today at the rapid development of LED, LED drive circuit also will fast track, multi-drive circuit modes exist,and different designs options is in improving. in the area of LED lighting, if there is no good driver circuit using, the advantages of LED will not be reflected. High-power LED is current-mode devices, strict control of constant current flowing through the LED is important, but also the LED dimming can be achieved to meet the various needs. The dissertation discusses in depth the driving LED mode, and based on IC PT4115 I design a lowcost,high efficiency, longer life,dimmable and constant current drive circuit to drive high-power LED. Then to analysis the driving circuit, I made the physical circuit and watched the circuit output with an oscilloscope waveform. The experimental results show that the design of the drive circuit can guarantee the stability of high-efficiency light-emitting LED, and I think that the driver circuit will be widespread used in engineering applications. 【key words】: High-power LED;Switching power supply;PWM;Constant current driver circuit;PT4115;STC89C52 目 录 中文摘要 I 英文摘要 II 第一章 绪 论 1 1.1 白光LED发展的背景和意义 1 1.2 白光LED的发展简介 2 1.3 课题介绍与研究意义 4 第二章 用到相关知识 5 2.1 LED发光原理 5 2.2 白光LED的伏安特性 5 2.3