LED驱动器中功率因数校正技术研究

发布时间：2018-03-08 13:55

本文选题：LED　切入点：功率因数　出处：《西安电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：当前全球经济的发展面临着越来越突出的资源短缺和环境污染问题,并由此导致的全球能源和环保的压力也越来越大。在此背景下,伴随着“绿色照明工程”的积极推进以及世界各国的节能环保意识逐步增强,LED照明技术被引入照明应用领域并已经成为当前照明市场和产业发展环境的主流趋势。LED(Lighting Emitting Diode)是发光二级管的简称。由于LED照明具有使用寿命长、发光效率高、绿色环保、体积小、抗冲击性能好以及便于灵活控制等优点,使其被广泛应用在建筑物外观及景观照明、交通信号灯及LCD显示屏、车辆指示类照明及植物照明等各个领域。目前,尽管各国对LED照明产业发展的政策引导作用不断加强使LED照明产业发展环境乐观,市场潜力巨大,但技术问题及成本仍是阻碍LED照明技术普及的最大的两个问题。然而在LED驱动电源中,功率因数低、电磁兼容超标和效率低则是其比较棘手的三个问题。因此,研究LED驱动电源中的功率因数技术将为LED照明市场的蓬勃发展提供重要的理论依据。功率因数校正技术(PFC)旨在提高电路的功率因数。该技术不仅能降低电网中的无功功率,还能减少谐波污染,提高电网的供电质量。因此如何抑制和消除谐波对公共电网的污染,提高功率因数已成为当今国内外电源界研究的主要课题。综观PFC技术的发展,PFC技术可分为两大类:一类是无源功率因数校正也称PPFC或称被动式PFC技术,另一类则是有源功率因数校正也称APFC或称主动式PFC技术。而目前最为大家所关注的APFC电路主要分为两级APFC电路和单级APFC电路。本文在参阅国内外大量有关LED驱动电源功率因数技术文献的基础上,首先对国内外功率因数技术的发展现状以及无源功率因数校正技术和有源功率因数校正技术的优缺点进行简析,其次对LED照明技术和开关电源技术做简要介绍,紧接着对单级APFC技术和两级APFC技术做简单的比较,最后通过单级APFC电路对有源功率因数校正技术进行深入研究。本文通过采用工作在原边反馈模式下的单级APFC恒流控制芯片MP4021设计的50W单端Flyback开关电源来对单级APFC技术进行详细介绍,并对单级APFC的纹波大的缺点设计控制电路以保证良好的纹波特性。论文同时对该电源中的各个参数进行详细设计,并对变压器、开关管和输出整流二极管的损耗进行估算,然后对开关电源中电磁兼容做简要的分析。
[Abstract]:The current development of the global economy is facing more and more prominent problems of resource shortage and environmental pollution, and the resulting pressure on global energy and environmental protection is also increasing. With the active promotion of "Green Lighting Project" and the awareness of energy saving and environmental protection in the world, LED lighting technology has been introduced into lighting application field and has become the mainstream trend of lighting market and industrial development environment. LEDX Lighting Emitting Diode is the abbreviation of LEDs. Because of the long service life of LED lighting, The advantages of high luminous efficiency, environmental protection, small size, good impact resistance and flexible control make it widely used in building appearance and landscape lighting, traffic signal light and LCD display screen. At present, although the policy guidance role of various countries to the development of LED lighting industry has been strengthened, the environment of LED lighting industry is optimistic, and the market potential is huge. However, in LED driving power supply, low power factor, high EMC and low efficiency are the three thorny problems. The study of the power factor technology in the LED driving power supply will provide an important theoretical basis for the vigorous development of the LED lighting market. The power factor correction technology is designed to improve the power factor of the circuit. This technology can not only reduce the reactive power in the power grid, but also improve the power factor of the circuit. It can also reduce harmonic pollution and improve the quality of power supply. Improving power factor has become the main research topic in the field of power supply at home and abroad. The development of PFC technology can be divided into two categories: one is passive power factor correction, also known as PPFC or passive PFC technology, and the other is passive power factor correction (PFC), which is also called passive power factor correction (PFC). The other is active Power Factor Correction (APFC), or active PFC technology, and the most concerned APFC circuits are mainly composed of two-stage APFC circuits and single-stage APFC circuits. In this paper, we refer to a large number of domestic and foreign related LED drives. Based on the technical literature of power factor, Firstly, the development status of power factor technology at home and abroad and the advantages and disadvantages of passive power factor correction technology and active power factor correction technology are briefly analyzed. Secondly, the LED lighting technology and switching power supply technology are briefly introduced. Then, a simple comparison between single-stage APFC technology and two-level APFC technology is made. Finally, the active power factor correction (APFC) technology is deeply studied by single-stage APFC circuit. In this paper, a 50W single-terminal Flyback switching power supply based on single-stage APFC constant-current control chip MP4021, which works in the original side feedback mode, is used to design a single-stage APFC. Technology is introduced in detail, In order to ensure good ripple characteristics, the control circuit is designed to guarantee the good ripple characteristics of single-stage APFC. At the same time, the parameters of the power supply are designed in detail, and the losses of transformer, switch and output rectifier diode are estimated. Then the electromagnetic compatibility in switching power supply is analyzed briefly.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN312.8

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