单级PFC反激式LED驱动控制环路的研究与设计

发布时间：2018-12-07 21:13

【摘要】：经历了温室效应和地球资源匮乏的困境后,低碳绿色环保成为如今能源发展不可逆转的大趋势。在照明领域上研究人员不断追求技术的极限,发光二极管(LED)成功地应用在日常照明环境时受到了大量的关注,作为一种固体光源,LED照明以其绿色节能环保、寿命极长、使用安全可靠和设计灵活等特点将逐步取代历代光源成为照明领域的领头羊。经历了十几年的不断发展,LED驱动技术作为LED照明关键的一个环节从一开始的不成熟跨越到到如今的普及应用,目前LED驱动控制朝着简单化、功能化等方向发展。照明需求的普遍性表明了其在应用上的基数是庞大无比的,同时国际或国家的谐波标准中面对的电气设备门槛越来越低功率化,具备功率因数校正(PFC)的LED照明设备无疑是具有很大的实用价值。本文研究并分析了一种单级PFC反激式LED驱动控制环路,电路使用了反激式变换器拓扑结构,利用电压跟随控制技术实现功率因数校正的功能,通过电压误差比较器调节开关MOSFET导通时间改变从电源输入端输送到输出端的能量来稳定输出电流,在其他辅助技术上,借鉴了原边反馈技术实现反馈控制环路,以及准谐振检测技术实现开关MOSFET软切换提高了能量的使用效率。本文首先从单级PFC实现的基础原理进行分析,在确定了电路构架的基础上研究分析单级PFC反激式LED驱动控制环路实现的理论基础,针对控制环路的每个主要环节设计了包括电感电流采样、电压预处理、电压误差放大器、导通时间调制、电感电流下降时间检测和准谐振检测等电路模块并分别仿真分析了模块的功能与性能表现,最后对由上述主要模块衔接而成的整体系统电路采用HSPICE工具进行仿真并验证,电路谐波畸变率满足谐波标准要求,功率因数校正达到0.9,满足应用上的基本需求。
[Abstract]:After the plight of Greenhouse Effect and the scarcity of earth resources, low carbon green environment has become an irreversible trend of energy development. In the field of lighting, researchers continue to pursue the limits of technology, light-emitting diode (LED) has been applied successfully in the daily lighting environment. As a kind of solid light source, LED lighting has a very long life, because of its green energy saving and environmental protection. The use of safe, reliable and flexible design will gradually replace the past generation of light sources to become the leader in the field of lighting. After more than ten years of continuous development, LED driver technology as a key link of LED lighting from the beginning of the immature leapfrogging to today's universal application, the current LED driver control towards simplification, functionalization and other directions. The universality of lighting demand indicates that its base number in application is enormous, and at the same time, the threshold of electrical equipment in the international or national harmonic standards is becoming lower and lower. LED lighting equipment with power factor correction (PFC) is undoubtedly of great practical value. In this paper, a single-stage PFC flyback LED drive control loop is studied and analyzed. The circuit uses the topology of flyback converter and uses the voltage following control technology to realize the function of power factor correction (PFC). The output current is stabilized by adjusting the switching MOSFET on time by the voltage error comparator. In other auxiliary technologies, the feedback control loop is realized by using the original side feedback technique as reference. And quasi-resonant detection technology to achieve switching MOSFET soft switching improved the efficiency of energy use. In this paper, the basic principle of single-stage PFC implementation is analyzed, and the theoretical basis of single-stage PFC flyback LED drive loop realization is studied based on the circuit frame. For each main link of the control loop, the inductance current sampling, voltage preprocessing, voltage error amplifier, on-time modulation are designed. The circuit modules of inductance current drop time detection and quasi resonance detection are simulated and analyzed respectively. Finally, the whole system circuit which is connected by the above main modules is simulated and verified by HSPICE tool. The harmonic distortion rate of the circuit meets the requirements of harmonic standard, and the power factor correction reaches 0.9, which meets the basic requirements of application.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46;TM923.34

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