新型大功率LED照明驱动电源的设计与实现

发布时间：2018-04-01 06:23

本文选题：大功率　切入点：EMI滤波器　出处：《华南理工大学》2014年硕士论文

【摘要】：LED作为新一代绿色照明光源，以其高效率、低功耗、长寿命、更环保、可调性好等优势，在关注资源能源节约的今天，在照明领域占据着越来越重要的地位。随着LED照明应用的日益广泛和深入，突显出了各种亟待解决的问题。本文针对目前LED照明驱动电源的大功率化困难、EMC特性不理想、智能化应用不足这三个技术难点，针对大功率LED照明的新型驱动电源进行研究，以寻求解决这三个技术难点的有效途径，，验证大功率LED智能照明的可行性，帮助LED大功率照明产品进一步推广和应用。本文以给出新型大功率LED照明驱动电源研究意义开始，介绍了LED照明驱动电源的发展现状和趋势，就LED照明驱动需要具体考虑的问题进行分析，得出本设计的基本方向。围绕驱动电源的电磁兼容特性进行专门的EMI滤波器设计和性能仿真，设计了一个对电磁干扰吸收能力很强的前置EMI滤波器，对共模或差模干扰信号的插入损耗在一定范围内达到100dB。本文重点针对大功率LED照明的要求，设计了一款基于SSL1750T控制芯片和MBI1802恒流调光驱动芯片的大功率LED驱动电源。电源电路包含了反激式拓扑结构变换和有源功率因素校正，输出最大功率可达120W，提供四个LED连接回路，并且提供LED的PWM调光方式，可调光范围为0%~100%。另外，根据实际应用需求设计了针对大功率LED照明驱动电源实时调光和散热的控制电路，以单片机为处理器的控制电路实现了根据环境背景光的不同而自动改变照明等级，同时在电源内部过热时启动散热风扇。最后，基于以上的设计进行PCB的打样和新型大功率LED驱动电源的实物制作，通过电路的调试最终完成了一套大功率LED照明驱动电源的设计制作，通过实验测试，电源的最高效率可达87.31%，功率因素可达97.5%，设定LED驱动电流的灵敏度高。
[Abstract]:As a new generation of green lighting light source, LED has the advantages of high efficiency, low power consumption, long life, more environmental protection, good tunability and so on. Nowadays, LED is playing a more and more important role in the field of lighting.With the wide application of LED lighting, various problems need to be solved.In this paper, aiming at the three technical difficulties of LED lighting driving power supply, such as the difficulty of high power conversion and the shortage of intelligent application, the new driving power supply for high power LED lighting is studied.In order to find an effective way to solve these three technical difficulties, to verify the feasibility of high-power LED intelligent lighting, and to help LED high-power lighting products to be further promoted and applied.At the beginning of this paper, the research significance of new high power LED lighting driving power supply is given, the development status and trend of LED lighting driving power supply are introduced, the problems that need to be considered in LED lighting drive are analyzed, and the basic direction of this design is obtained.A special EMI filter design and performance simulation is carried out around the EMC characteristics of the driving power supply, and a prefabricated EMI filter is designed, which has a strong absorption ability to electromagnetic interference (EMI).The insertion loss of common-mode or differential mode interference signals is 100 dB in a certain range.In order to meet the requirements of high power LED lighting, a high power LED driver based on SSL1750T control chip and MBI1802 constant current dimming driver is designed in this paper.The power circuit includes flyback topology conversion and active power factor correction, the maximum output power can be up to 120W, four LED connection circuits are provided, and the PWM dimming mode of LED is provided. The adjustable light range is 0 and 100.In addition, according to the practical application requirements, the control circuit for the real-time dimming and heat dissipation of the high-power LED illumination driving power supply is designed. The control circuit based on single-chip microcomputer can automatically change the lighting level according to the different background light of the environment.At the same time, when the power source is overheated, start the cooling fan.Finally, based on the above design, the PCB proofing and a new type of high-power LED driving power supply are made. Finally, a set of high-power LED lighting driver power supply is designed and manufactured through the circuit debugging, and the experimental test is carried out.The maximum efficiency of power supply can reach 87.31 and the power factor can reach 97.5. the sensitivity of setting LED drive current is high.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM923.34

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