基于PSR控制的单级PFC高精度LED驱动的研究与设计
发布时间：2019-07-02 19:47
【摘要】：近年来随着全球能源成本的持续上升,世界上大多数国家和社会对节能环保的要求越来越高,更高效、更低成本的照明光源相继被研发出来,其中以LED为代表的新一代照明光源以其效率高、寿命长、成本低、绿色环保等众多优点[1]而被世界上众多的国家、科研机构和照明企业所广泛重视。这些都使得LED照明在世界照明市场上的比重越来越大,从而带动了LED驱动产业的迅速发展。然而普通的LED驱动电源因为没有功率因数校正功能而造成了谐波污染等各种问题,影响了电网的安全。因此带有功率因数校正功能的LED驱动电源应运而生,有效抑制了谐波对电网的污染,极大提升了电能的使用效率。基于小功率LED照明的场合,本文设计了一款带有功率因数校正功能的反激式LED驱动芯片。反激式的拓扑使得电路结构更加简单,不需要次级输出电感,因而成本更低。使用原边反馈(PSR)的方式控制环路及输出电流,虽然在电流控制上不如次级反馈更精确,但省去了光耦,降低了体积和成本,提高了系统稳定性。该芯片工作于断续工作模式,具有过温保护、过压保护以及负载短路开路保护等功能,同时还能够对芯片进行欠压保护,防止因输入电压突然低于设定值而导致电流过大,器件损坏等情况出现。芯片内部主要模块包括启动与欠压保护模块、电压基准模块、误差放大器模块、波谷检测模块、数字逻辑模块、驱动模块等。文中阐述了单级反激式PFC芯片的电流及PF值控制理论,并推导了基于原边反馈的电流控制方程式。根据芯片设计要求,完成了芯片电路总体布局构思,并且完成了基于TSMC 0.5?m数模混合信号BCD工艺仿真模型的芯片内部所有模块的设计与仿真,在输入电压90~265V AC/50Hz的范围内,完成了芯片的整体仿真与验证。仿真结果达到了输出电流300毫安,恒流精度高于5%,功率因数校正值大于0.9的设计要求和目标。
[Abstract]:In recent years, with the continuous rise of global energy cost, most countries and societies in the world have higher and higher requirements for energy saving and environmental protection, more efficient and lower cost lighting sources have been developed one after another. Among them, the new generation of lighting light sources represented by LED has been widely valued by many countries, scientific research institutions and lighting enterprises because of its many advantages, such as high efficiency, long life, low cost, green environmental protection and so on. All these make the proportion of LED lighting in the world lighting market more and more, which leads to the rapid development of LED-driven industry. However, the common LED drive power supply has caused various problems such as harmonic pollution because of the lack of power factor correction function, which affects the safety of the power grid. Therefore, the LED driving power supply with power factor correction function emerges as the times require, which effectively suppresses the harmonic pollution to the power grid and greatly improves the efficiency of electric energy. Based on the situation of low power LED lighting, a flyback LED driver chip with power factor correction function is designed in this paper. The flyback topology makes the circuit structure simpler and does not need secondary output inductance, so the cost is lower. The original edge feedback (PSR) is used to control the loop and output current, although the current control is not as accurate as the secondary feedback, but the photocoupling is eliminated, the volume and cost are reduced, and the stability of the system is improved. The chip works in intermittent working mode and has the functions of overtemperature protection, overvoltage protection and load short circuit open circuit protection. At the same time, it can also protect the chip against excessive current and device damage caused by the sudden lower input voltage than the set value. The main modules of the chip include start-up and undervoltage protection module, voltage reference module, error amplifier module, wave valley detection module, digital logic module, drive module and so on. In this paper, the current and FP value control theory of single-stage flyback PFC chip is described, and the current control equation based on original edge feedback is derived. According to the requirements of chip design, the overall layout of the chip circuit is completed, and all the modules inside the chip based on TSMC 0.5 / m digital-analog mixed signal BCD process simulation model are designed and simulated. The overall simulation and verification of the chip are completed in the range of input voltage 90 脳 265V AC/50Hz. The simulation results meet the design requirements and objectives of output current of 300 Ma, constant current accuracy of more than 5% and power factor correction value of more than 0.9.
【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】：TM923.34
本文编号：2509178
[Abstract]:In recent years, with the continuous rise of global energy cost, most countries and societies in the world have higher and higher requirements for energy saving and environmental protection, more efficient and lower cost lighting sources have been developed one after another. Among them, the new generation of lighting light sources represented by LED has been widely valued by many countries, scientific research institutions and lighting enterprises because of its many advantages, such as high efficiency, long life, low cost, green environmental protection and so on. All these make the proportion of LED lighting in the world lighting market more and more, which leads to the rapid development of LED-driven industry. However, the common LED drive power supply has caused various problems such as harmonic pollution because of the lack of power factor correction function, which affects the safety of the power grid. Therefore, the LED driving power supply with power factor correction function emerges as the times require, which effectively suppresses the harmonic pollution to the power grid and greatly improves the efficiency of electric energy. Based on the situation of low power LED lighting, a flyback LED driver chip with power factor correction function is designed in this paper. The flyback topology makes the circuit structure simpler and does not need secondary output inductance, so the cost is lower. The original edge feedback (PSR) is used to control the loop and output current, although the current control is not as accurate as the secondary feedback, but the photocoupling is eliminated, the volume and cost are reduced, and the stability of the system is improved. The chip works in intermittent working mode and has the functions of overtemperature protection, overvoltage protection and load short circuit open circuit protection. At the same time, it can also protect the chip against excessive current and device damage caused by the sudden lower input voltage than the set value. The main modules of the chip include start-up and undervoltage protection module, voltage reference module, error amplifier module, wave valley detection module, digital logic module, drive module and so on. In this paper, the current and FP value control theory of single-stage flyback PFC chip is described, and the current control equation based on original edge feedback is derived. According to the requirements of chip design, the overall layout of the chip circuit is completed, and all the modules inside the chip based on TSMC 0.5 / m digital-analog mixed signal BCD process simulation model are designed and simulated. The overall simulation and verification of the chip are completed in the range of input voltage 90 脳 265V AC/50Hz. The simulation results meet the design requirements and objectives of output current of 300 Ma, constant current accuracy of more than 5% and power factor correction value of more than 0.9.
【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】：TM923.34
【参考文献】
相关硕士学位论文 前1条
1 郑艳丽;LED驱动电源测试与认证中的技术问题研究[D];杭州电子科技大学;2011年
，本文编号：2509178
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