【作者】 尤波；

【导师】 王旭东；

【作者基本信息】 哈尔滨理工大学 ， 电力电子与电力传动， 2021， 硕士

【摘要】 LED灯具在照明领域得到了广泛的使用。然而LED灯具的频闪会损伤眼部光学系统,造成视觉疲劳、偏头痛、近视加剧等诸多问题也引起了人们的关注,LED灯具中最重要的核心部件是LED驱动电源,也是最为脆弱的部分。可见研究无频闪、高功率因数、高效率的LED驱动电源具有重要的意义。针对这些问题提出了一种采用新型氮化镓功率器件,基于无桥PFC拓扑与LLC半桥谐振拓扑的高功率因数无频闪LED驱动电源。本文首先研究了氮化镓的材料特性与器件的结构,并对级联型氮化镓器件的工作模态进行了详细的分析,然后分析了寄生参数对氮化镓器件驱动电路的性能影响,并对氮化镓器件与Si MOSFET的特性和开关波形进行比较,对几种无桥PFC拓扑结构进行了对比分析。建立了图腾式无桥PFC电路的数学模型并对其进行了噪声分析。针对所设计的图腾式无桥PFC电路在MATLAB/Simulink平台上搭建了仿真模型,验证了控制策略的正确性。对比分析了斩波电路拓扑中LED负载在不同元件通路上效率,LED负载效率与占空比的关系,并利用Saber软件验证了理论分析的正确性。并对LLC半桥谐振拓扑结构与工作原理进行了分析与仿真,建立了数学模型对输出电流纹波进行了分析。深入研究了LED频闪消除技术,并设计了频闪消除电路,介绍了其拓扑结构与工作原理。最后根据设计要求,计算元件参数,并设计了相应的数字控制策略,进行了AC/DC电路、DC/DC电路的器件选型、硬件与PCB设计。经过对LED驱动电源样机测试,整机效率达到92%以上,功率因数达到0.98以上。并进行了频闪消除实验、电压纹波测试、电流谐波分析与线性调整率测试,实验结果满足LED驱动电源的设计要求。并与采用整流桥与硅功率器件的传统LED驱动电源进行了效率与功率因数对比,体现出本设计的优势。更多还原

【Abstract】 LED lamps are widely applied in the domain of illumination.However,the stroboscopic light of LED lamps will damage the optical system of the eyes,causing visual fatigue,migraine,aggravating myopia and many other problems,which have aroused people’s attention.The most important core component of LED lamps is the LED drive power supply,which is also the most vulnerable part.Therefore,it is of great meaning to study the flicker free,high power factor and high efficiency LED drive power supply.In order to solve these problems,a high power factor flicker free LED driving power supply based on bridgeless PFC topology and LLC half bridge resonant topology is proposed.In this paper,firstly,the material characteristics and device structure of Ga N are studied,and the operating modes of cascaded Ga N devices are analyzed in detail.Then,the influence of parasitic parameters on the performance of Ga N devices and Si devices is analyzed The characteristics and switching waveforms of MOSFET are compared,and then several bridgeless PFC topologies are compared and analyzed,and the corresponding working principles,merits and demerits are explained.The mathematical model of totem bridgeless PFC circuit is established and its noise is analyzed.For the totem bridgeless PFC circuit,a simulation system model is built on the MATLAB/Simulink software platform to verify the correctness of the control strategy.The efficiency of LED load in different component paths,the relationship between LED load efficiency and duty cycle in chopper circuit topology are compared and analyzed.The correctness of the theoretical analysis is verified by saber software.The LLC half bridge resonant topology and working principle are analyzed and simulated.The mathematical model is established to analyze the output current ripple.In this paper,the stroboscopic elimination technology is deeply studied,and the stroboscopic elimination circuit is designed,and its topology and working principle are introduced.Finally,on the basis of the design demands,the part requirements are calculated,and the corresponding digital control strategy is designed.The hardware selection,hardware and PCB design of AC/DC circuit and DC/DC circuit are designed.The results show that the efficiency of the whole machine is more than 92%,and the power factor is more than 0.98.In addition,stroboscopic elimination experiment,voltage ripple test,current harmonic analysis and linear adjustment rate test are carried out.The test results meet the design requirements of LED driving power supply.The efficiency and power factor of traditional LED driving power supply with rectifier bridge and silicon power device are compared,which shows the advantages of this design.更多还原