一种高性能反激式LED驱动芯片的设计

发布时间：2018-03-13 02:40

本文选题：LED　切入点：PFC　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：照明光源的发展必将顺应时代的发展,当今世界的两大课题能源和环保,指明了照明光源的发展方向。LED灯具具有高光效和无污染的特点,使得LED照明具有良好发展前景。然而,不同于白炽灯的直接交流驱动,LED要求高性能的电源进行驱动,LED驱动电源的研究与开发的深度,直接决定了商家在在照明市场的竞争力。基于上述问题,顺应时代的潮流,本文设计了一种高性能的LED电源驱动芯片。本文设计的芯片输入电压是85V~265V的交流电压,具有较宽的输入电压范围,同时应用很方便。芯片采用离线式输出,提高了安全性。本芯片的主要功能是实现输出电流恒定和功率因数校正,芯片通过对原边电流的采样,同时进行输出恒流控制和功率因数校正控制,精简了控制环路,降低了芯片成本。芯片的设计指标要求输出电流平均值恒定,功率因子在0.95以上。在芯片的设计过程中,通过对常见LED驱动电路和开关电源拓扑的分析,确定了芯片的应用电路。对电路控制方式的分析,明确了芯片的环路布局,进而确定了芯片的整体结构。接下来确定了芯片的一些主要性能指标。根据以上工作,开始对芯片子模块进行设计。本文详细分析了一下几个模块电路:高性能带隙基准电压源、基准电压电路和欠压封锁电路。这些模块为芯片的工作提供基准和保护,要求较高的性能,通过理论分析与仿真验证,确保电路功能正确并尽可能的提高电路的性能。接下来,联合芯片外围电路对芯片进行仿真验证,并对以上几个子模块在联合仿真中的工作状态进行了分析,最后对芯片的进行了功能性仿真,验证了芯片具有恒定输出电流和功率因数校正的功能。
[Abstract]:The development of lighting sources will conform to the development of the times. Two major topics in the world, energy and environmental protection, have pointed out the development direction of lighting sources. Led lamps have the characteristics of high light efficiency and no pollution, which makes LED lighting have a good development prospect. Unlike incandescent lamps, direct AC drive LED requires high performance power supply to carry out the research and development of LED driving power supply, which directly determines the competitiveness of merchants in the lighting market. Based on the above problems, conform to the trend of the times. In this paper, a high performance LED power supply drive chip is designed. The input voltage of the chip is 85V / 265V, which has a wide input voltage range and is convenient to be applied. The main function of this chip is to realize constant output current and power factor correction. The chip simplifies the control loop by sampling the original side current and carrying out the output constant current control and power factor correction control at the same time. The cost of the chip is reduced. The average output current is constant and the power factor is above 0.95. During the design of the chip, the common LED drive circuit and switching power supply topology are analyzed. The application circuit of the chip is determined. The circuit control mode is analyzed, the loop layout of the chip is determined, and then the overall structure of the chip is determined. Then, some main performance indexes of the chip are determined. This paper analyzes several modules in detail: high performance bandgap voltage reference source, reference voltage circuit and under-voltage blocking circuit. These modules provide reference and protection for the work of the chip. High performance is required, through theoretical analysis and simulation verification, to ensure that the circuit function is correct and to improve the circuit performance as much as possible. The working state of the above sub-modules in the joint simulation is analyzed. Finally, the functional simulation of the chip is carried out, which verifies that the chip has the function of constant output current and power factor correction.
【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

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