无电解电容LED驱动电源研究和设计
发布时间：2018-08-17 19:33
【摘要】：近年来,各国研究学者一直致力于新型照明光源的开发与设计。高亮度发光二极管以其高效、节能环保、长寿命,高可靠性等诸多优点,被公认为21世纪最有价值的"绿色"光源。针对驱动电源与光源寿命不匹配的问题,本文经过对多种消除电解电容的策略进行分析,将优化电路拓扑结构为主要方向,分析研究无电解电容LED驱动电源的电路拓扑结构。本文致力于设计一种低频脉动电流LED驱动电路,不需要任何电解电容或复杂的控制电路去减小低频输出纹波。这个电路使用单开关拓扑结构从而简化了控制器的设计,能够将储能电容减小到微法级,所以薄膜电容可以被用来取代电解电容。LED驱动电源是一个功率变换器,将输入交流电压变换为稳定的直流电压,供给LED光源。由于LED驱动电源的输入功率是脉动的,为了保证输出功率是恒定的,因此需要大容量的储能电容来平衡瞬时输入功率和输出功率间的能量波动,储能电容一般选用大容量的电解电容。而电解电容的寿命只有几千小时,远远短于LED的寿命(50,000小时),这使得LED驱动电源与LED的长寿命不匹配。为了延长电源的使用寿命,必须减小甚至去除电源中的电解电容,或者使用其他类型的电容替代电解电容。本文研究源于两级联DCM反激式转换器的概念,设计了一个新型的无电解电容电路。详细论述了电路的工作原理、开关状态、参数选择和控制电路设计。并利用MATLAB仿真进行验证。高效率、低成本、高功率因数和长寿命的驱动电源是保证LED光源发光品质和整体性能的关键。本文分析了输入功率因数、输入功率脉动与所需要的储能电容容量之间的关系,在此基础上提出了一种三次谐波注入的控制方法,即在变换器的输入电流中注入三次谐波,在保证输出电压纹波不变、输入功率因数不低于0.9的条件下将储能电容容量减小为改进电路中的65.6%,体积减小了近20%,并在一台60WBoostPFC变换器的原理样机上进行验证,最后得出实验结果。通过将仿真和实验的两个结果进行对比,验证了理论分析的正确性和可行性,表明该电路具有较强的实用性和优越性。通过实验数据分析,此款无电解电容的设计方案具有高功率因数、高效率、高可靠性等特点;同时满足节能环保的要求和EMC测试标准。
[Abstract]:In recent years, researchers all over the world have been committed to the development and design of new lighting sources. High brightness LED is recognized as the most valuable "green" light source in the 21st century because of its advantages of high efficiency, energy saving, environmental protection, long life, high reliability and so on. Aiming at the mismatch between the driving power supply and the light source, this paper analyzes various strategies to eliminate the electrolytic capacitance, and takes the optimization of the circuit topology as the main direction to analyze and study the circuit topology of the LED drive power supply without electrolytic capacitance. This paper is devoted to the design of a low frequency pulsating current LED drive circuit without any electrolytic capacitance or complex control circuit to reduce the low frequency output ripple. The circuit uses a single-switch topology to simplify the design of the controller, reducing the energy storage capacity to a micronormal level, so the thin film capacitor can be used to replace the electrolytic capacitor. The LED drive power supply is a power converter. The input AC voltage is converted to a stable DC voltage to supply the LED light source. Since the input power of the LED drive power supply is pulsating, in order to ensure the output power is constant, a large capacity energy storage capacitor is needed to balance the energy fluctuation between the instantaneous input power and the output power. Energy storage capacitors are generally large-capacity electrolytic capacitors. However, the lifetime of electrolytic capacitor is only several thousand hours, which is much shorter than that of LED (50000 hours), which makes the LED drive power supply mismatch the long life of LED. In order to prolong the service life of the power supply, the electrolytic capacitance in the power supply must be reduced or even removed, or other types of capacitors should be used to replace the electrolytic capacitance. In this paper, the concept of two-cascade DCM flyback converter is studied, and a novel electrolytic capacitor circuit is designed. The working principle, switch state, parameter selection and control circuit design of the circuit are discussed in detail. And use MATLAB simulation to verify. High efficiency, low cost, high power factor and long life driving power supply are the key to ensure the luminous quality and overall performance of LED light source. In this paper, the relationship between input power factor, input power pulsation and the capacity of energy storage capacitor is analyzed. Based on this, a control method of third harmonic injection is proposed, that is, the third harmonic is injected into the input current of the converter. Under the condition that the output voltage ripple is constant and the input power factor is not lower than 0.9, the capacity of the energy storage capacitor is reduced to 65.6 in the improved circuit, and the volume is reduced by nearly 20 percent, which is verified on the principle prototype of a 60WBoostPFC converter. Finally, the experimental results are obtained. The correctness and feasibility of the theoretical analysis are verified by comparing the two results of simulation and experiment, and it is shown that the circuit has strong practicability and superiority. Through the analysis of experimental data, the design scheme of non-electrolytic capacitance has the characteristics of high power factor, high efficiency and high reliability, and meets the requirements of energy saving and environmental protection and EMC test standard.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46
本文编号：2188674
[Abstract]:In recent years, researchers all over the world have been committed to the development and design of new lighting sources. High brightness LED is recognized as the most valuable "green" light source in the 21st century because of its advantages of high efficiency, energy saving, environmental protection, long life, high reliability and so on. Aiming at the mismatch between the driving power supply and the light source, this paper analyzes various strategies to eliminate the electrolytic capacitance, and takes the optimization of the circuit topology as the main direction to analyze and study the circuit topology of the LED drive power supply without electrolytic capacitance. This paper is devoted to the design of a low frequency pulsating current LED drive circuit without any electrolytic capacitance or complex control circuit to reduce the low frequency output ripple. The circuit uses a single-switch topology to simplify the design of the controller, reducing the energy storage capacity to a micronormal level, so the thin film capacitor can be used to replace the electrolytic capacitor. The LED drive power supply is a power converter. The input AC voltage is converted to a stable DC voltage to supply the LED light source. Since the input power of the LED drive power supply is pulsating, in order to ensure the output power is constant, a large capacity energy storage capacitor is needed to balance the energy fluctuation between the instantaneous input power and the output power. Energy storage capacitors are generally large-capacity electrolytic capacitors. However, the lifetime of electrolytic capacitor is only several thousand hours, which is much shorter than that of LED (50000 hours), which makes the LED drive power supply mismatch the long life of LED. In order to prolong the service life of the power supply, the electrolytic capacitance in the power supply must be reduced or even removed, or other types of capacitors should be used to replace the electrolytic capacitance. In this paper, the concept of two-cascade DCM flyback converter is studied, and a novel electrolytic capacitor circuit is designed. The working principle, switch state, parameter selection and control circuit design of the circuit are discussed in detail. And use MATLAB simulation to verify. High efficiency, low cost, high power factor and long life driving power supply are the key to ensure the luminous quality and overall performance of LED light source. In this paper, the relationship between input power factor, input power pulsation and the capacity of energy storage capacitor is analyzed. Based on this, a control method of third harmonic injection is proposed, that is, the third harmonic is injected into the input current of the converter. Under the condition that the output voltage ripple is constant and the input power factor is not lower than 0.9, the capacity of the energy storage capacitor is reduced to 65.6 in the improved circuit, and the volume is reduced by nearly 20 percent, which is verified on the principle prototype of a 60WBoostPFC converter. Finally, the experimental results are obtained. The correctness and feasibility of the theoretical analysis are verified by comparing the two results of simulation and experiment, and it is shown that the circuit has strong practicability and superiority. Through the analysis of experimental data, the design scheme of non-electrolytic capacitance has the characteristics of high power factor, high efficiency and high reliability, and meets the requirements of energy saving and environmental protection and EMC test standard.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46
【参考文献】
相关期刊论文 前5条
1 罗全明;邹灿;支树播;闫欢;周雒维;;基于无源谐振恒流网络的多路输出LED驱动电源[J];中国电机工程学报;2013年18期
2 陈为;王小博;;一种具多路LED自动均流功能的反激式磁集成变换器[J];中国电机工程学报;2012年30期
3 宋洁琼;林燕丹;童立青;孙耀杰;;基于视觉舒适的LED驱动器评价方法[J];照明工程学报;2012年05期
4 陈海明;;国外白光LED技术与产业现状及发展趋势[J];半导体技术;2010年07期
5 廖志凌;阮新波;;半导体照明工程的现状与发展趋势[J];电工技术学报;2006年09期
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