高功率因数低输出纹波LED驱动电源的研究

发布时间：2018-07-10 02:07

本文选题：LED驱动电源 + 高功率因数　；参考：《江苏大学》2017年硕士论文

【摘要】：发光二极管(Lighting Emitting Diode,LED),具有亮度高,功率低,使用寿命长等优点。LED照明的发展依赖于LED驱动电源技术的成熟与进步。功率因数和输出纹波是衡量LED驱动电源性能好坏的重要指标。为了提高功率因数和降低输出纹波,本文对级联式LED驱动电源做了一些研究。首先介绍了LED驱动电源的研究背景及意义,阐述了LED的发光原理与特性。根据国内外参考文献,分别归纳分析了高功率因数和低输出纹波LED驱动电源的研究现状。深入研究了级联式LED驱动电源,以基于二次型Buck变换器的LED驱动电源为例,详细分析了主电路的工作模态与工作特性,对主电路参数进行了优化设计。通过PSIM仿真验证了理论分析的正确性。其次,提出了一种新型基于二次型Buck变换器的交错并联LED驱动电源,利用交错并联技术,优化了原有二次型Buck变换器的拓扑结构,降低了开关器件的电压电流应力,减小了输出纹波。在不同开关占空比的条件下,分析了主电路的工作模态。详细分析了主电路的工作特性,为主电路参数设计提供了依据。通过PSIM对理论分析进行了仿真验证。然后,针对基于二次型Buck变换器的交错并联LED驱动电源存在输入电流过零死区的问题,提出了一种新型基于Buck-boost级联二次型Buck的交错并联LED驱动电源。通过共用一个开关管,在原有拓扑结构的基础上级联了一个Buck-boost电路。详细分析了主电路的工作模态、中间储能电容电压特性、电感工作在电流断续模式的条件和开关频率特性。利用Buck-boost电路的特性,基本解决了输入电流过零死区的问题,改善了输入电流总谐波畸变率,使功率因数近似为1。最后,针对所提出的基于Buck-boost级联二次型Buck的交错并联LED驱动电源设计制作了实验样机。为了主电路开关器件的选型,分析计算了主电路开关器件的最大电压电流应力。详细设计了控制电路及驱动隔离电路。通过实验,得出的结果与理论分析基本一致,再次证明了理论分析的正确性。
[Abstract]:Light emitting Diode (LED) has the advantages of high brightness, low power and long service life. The development of LED lighting depends on the maturity and progress of LED driving power technology. Power factor and output ripple are important indexes to measure the performance of LED drive power supply. In order to improve the power factor and reduce the output ripple, the cascade LED drive power supply is studied in this paper. Firstly, the research background and significance of LED driving power are introduced, and the principle and characteristics of LED are expounded. According to the references at home and abroad, the research status of high power factor and low output ripple LED driver is summarized and analyzed respectively. The cascade LED driving power supply is deeply studied. Taking the LED drive power supply based on the quadratic Buck converter as an example, the working modes and working characteristics of the main circuit are analyzed in detail, and the main circuit parameters are optimized. The theoretical analysis is verified by PSIM simulation. Secondly, a novel interleaving parallel LED driving power supply based on secondary Buck converter is proposed. The topology of the original secondary Buck converter is optimized by using the staggered parallel technology, and the voltage and current stress of the switching device is reduced. The output ripple is reduced. The operating modes of the main circuit are analyzed under different duty cycle conditions. The working characteristics of the main circuit are analyzed in detail, and the design basis of the main circuit parameters is provided. The theoretical analysis is verified by PSIM. Then, a novel Buck-boost cascaded parallel LED driver based on Buck-boost cascade is proposed to solve the problem of zero-crossing dead time of input current in the interleaved parallel LED driving power supply based on quadratic Buck converter. By sharing one switch, a Buck-boost circuit is cascaded on the basis of the original topology. The operating mode of the main circuit, the voltage characteristics of the intermediate energy storage capacitor, the condition of the inductor working in the current intermittent mode and the switching frequency characteristics are analyzed in detail. By using the characteristics of Buck-boost circuit, the problem of zero crossing dead time of input current is basically solved, the total harmonic distortion rate of input current is improved, and the power factor is approximately 1. Finally, an experimental prototype is developed for the design of an interleaved parallel LED driver based on Buck-boost cascade secondary Buck. In order to select the switch devices of the main circuit, the maximum voltage and current stress of the switch devices of the main circuit is analyzed and calculated. Control circuit and drive isolation circuit are designed in detail. The experimental results are basically consistent with the theoretical analysis, and the correctness of the theoretical analysis is proved again.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

【参考文献】