LED驱动电源的研究与设计

发布时间：2018-10-15 17:05

【摘要】：随着全球资源的短缺,人们节能环保的意识日益提升,作为节能环保的LED照明越来越受到市场的青睐。LED是一种半导体发光器件,由于其结构特点,因此它不会和传统灯泡一样容易产生灯丝发光易烧、热沉积、光衰等情况。LED灯的优点之一是寿命长久,一般为传统白炽灯的十倍以上。从2012年10月开始,国家将按照计划逐步停止进口和销售普通白炽灯。通过国家补贴加快LED照明普及的步伐。因为目前市场上LED照明灯的价格是普通白炽灯的几倍甚至十几倍,所以尚未被普通民众广泛接受。但随着LED相关技术的不断提高,LED照明的成本势必会降低,从而为更多的老百姓所接受。虽然现阶段LED照明产品还不是很完美,LED照明行业发展也并不完善,但随着政府政策的支持,以及越来越多大型企业和高端人才进入这个行业,LED技术会越来越成熟,LED照明普及也将是大势所趋。现在看来制约LED发展的一个技术瓶颈是LED驱动电源,因为LED驱动电源相当于LED照明的心脏,LED驱动电源的好坏直接影响着LED灯的光效和寿命。开发出低成本、高效率的LED驱动电源是十分必要的。本文从LED驱动电路的设计成本和效率等方面综合考虑,设计开发了一款两级驱动拓扑的LED驱动电源。论文根据LED的电气特性作和驱动方式,选择确定了课题的设计方案,即功率因数校正拓扑采用Boost电路,后级拓扑采用LCC谐振电路,并选取恩智浦公司的UBA2013芯片进行控制。其次阐述了进行功率因数校正的必要性,并系统得介绍了功率因数校正中Buck、Buck-Boost、 Boost功率拓扑的工作原理。研究了驱动芯片配合Boost功率拓扑的工作方式,对所用拓扑中输出滤波电容、Boost电感、MOSFET开关管、输出二极管等主要工作器件参数进行了设计选择。然后通过对后级拓扑LCC谐振变换电路工作原理中各种工作模式的详细分析与研究,给出了LCC谐振变换器中谐振电感、谐振电容等参数的设计方案。随后提及了LED驱动电源设计中关键的电磁兼容性问题,分析了传导干扰中的共模干扰和差模干扰,通过对两种干扰工作原理的分析,设计了电磁干扰滤波器。也给出了抑制辐射干扰的一些设计。最后在前面研究分析的基础上设计了一个Boost+LCC两级拓扑的LED驱动电源样机。经过接通LED负载,给出了整机的测试结果,其中包括测试性能、LED驱动电源的实物图、主要波形、EMI测试结果等。通过测试结果验证了本设计的理论分析的正确性和系统方案的可行性和可靠性。
[Abstract]:With the shortage of global resources, people's awareness of energy saving and environmental protection is increasing. As a kind of energy-saving and environmental protection LED lighting is more and more popular in the market. LED is a semiconductor light-emitting device, because of its structural characteristics, Therefore, it is not as easy as traditional bulbs to produce filament luminescence, thermal deposition, light decay and so on. One of the advantages of LED lamp is its long life, which is generally more than ten times that of traditional incandescent lamp. Starting in October 2012, the country will phase out the import and sale of ordinary incandescent lamps as planned. State subsidies to accelerate the pace of LED lighting popularization. Because the price of LED lamps in the market is several times or even ten times that of incandescent lamps, it has not been widely accepted by the general public. But with the continuous improvement of LED related technology, the cost of LED lighting will be reduced, which is accepted by more people. Although the LED lighting products are not perfect and the development of LED lighting industry is not perfect, but with the support of government policies, And more large enterprises and high-end talent enter this industry, LED technology will become more mature, LED lighting will be popular is the trend. It seems that one of the technical bottlenecks restricting the development of LED is the LED driver, because the LED driver is the heart of LED lighting, and the LED driver directly affects the light efficiency and lifetime of the LED lamp. It is necessary to develop a low cost and high efficiency LED driver. Considering the design cost and efficiency of LED driver circuit, a two-stage driving topology LED driver power supply is designed and developed in this paper. According to the electrical characteristics and driving mode of LED, the thesis chooses the design scheme of the subject, that is, the power factor correction topology adopts Boost circuit, the latter stage topology uses LCC resonant circuit, and the UBA2013 chip of Enzipup is selected for control. Secondly, the necessity of power factor correction is expounded, and the working principle of Buck,Buck-Boost, Boost power topology in power factor correction is systematically introduced. The working mode of driving chip combined with Boost power topology is studied. The parameters of output filter capacitor, Boost inductor, MOSFET switch, output diode and so on are designed and selected. Then the design scheme of resonant inductance and resonant capacitance in LCC resonant converter is given through the detailed analysis and research of various working modes in the working principle of the backward topology LCC resonant converter. Then the key EMC problem in the design of LED driving power supply is mentioned, and the common mode interference and differential mode interference in the conduction interference are analyzed. The electromagnetic interference filter is designed by analyzing the working principle of the two kinds of interference. Some designs for suppressing radiation interference are also given. Finally, a LED driver prototype of Boost LCC two-stage topology is designed based on the previous research and analysis. After the LED load is connected, the test results of the whole machine are given, including the test performance, the physical diagram of the LED driver power supply, the main waveforms, the EMI test results and so on. The test results verify the correctness of the theoretical analysis and the feasibility and reliability of the system.
【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46;TM923.34

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