一种离线反激式的LED恒流驱动芯片设计
发布时间：2018-11-03 12:00
【摘要】：在当前全球能源短缺的大背景下,LED(Light Emitting Diode)作为一种新型的绿色光源,在照明领域受到了极大的关注。相对于传统的照明方式,LED具有节能、环保、高效、寿命长、体积小、可靠性高等优点。LED驱动电源的品质直接影响了LED产品的可靠性,在设计的过程中,需要考虑的因素有:成本、体积、输出功率、精度、功率因数值、效率等。另外还需要考虑调光、安全性、使用寿命等。本论文主要任务是设计一款离线反激式的LED恒流驱动IC。设计过程中,为了提高功率因数,将传统的反激控制器与PFC理论有机的结合起来,实现了带PFC功能的离线反激式LED恒流驱动IC设计。本论文的主要工作有以下几点:1.分析了LED驱动芯片的工作方式。提出了离线反激式LED恒流驱动芯片的架构,并推导了输出电流方程。2.分析离线反激式LED恒流驱动芯片的各个子模块的性能指标,选择合理的电路结构,并利用Cadence Spectre进行仿真,使芯片的各个模块达到所需要的指标。本文中涉及的模块包括基准模块、振荡器、乘法器、DCM检测模块、误差放大器。这些模块在本文中都给出了具体的实现电路,并完成了仿真验证。3.进行整体电路的仿真。在完成了各个子模块的设计后,对芯片整体电路进行仿真。验证了芯片的保护功能,包括:开路保护、短路保护和过温保护。并对芯片的整体性能进行了测试,恒流精度达到±4.5%,效率达到90%以上。4.采用CSMC 0.5μm 80V BCD工艺绘制芯片版图。在绘制过程中,对版图进行了合理的布局布线,并考虑了匹配及干扰对芯片性能的影响。
[Abstract]:Under the background of global energy shortage, LED (Light Emitting Diode), as a new type of green light source, has received great attention in the field of lighting. Compared with the traditional lighting mode, LED has the advantages of energy saving, environmental protection, high efficiency, long life, small volume, high reliability and so on. The quality of LED drive power directly affects the reliability of LED products. Factors to be considered are: cost, volume, output power, accuracy, power factor value, efficiency and so on. Also need to consider dimming, safety, service life and so on. The main task of this thesis is to design an off-line flyback LED constant-current driven IC.. In the design process, in order to improve the power factor, the traditional flyback controller and PFC theory are combined organically to realize the design of off-line flyback LED constant-current driving IC with PFC function. The main work of this paper is as follows: 1. The working mode of LED driver chip is analyzed. The structure of an off-line flyback LED constant current drive chip is presented, and the output current equation is derived. 2. This paper analyzes the performance indexes of each sub-module of off-line flyback LED constant current drive chip, selects the reasonable circuit structure, and simulates with Cadence Spectre to make each module of the chip achieve the required targets. The modules in this paper include reference module, oscillator, multiplier, DCM detection module, error amplifier. These modules are all given in this paper the specific implementation circuit, and completed the simulation verification. 3. The whole circuit is simulated. After completing the design of each sub-module, the whole circuit of the chip is simulated. The protection functions of the chip are verified, including open circuit protection, short circuit protection and over-temperature protection. The whole performance of the chip is tested. The constant current accuracy is 卤4.5 and the efficiency is above 90%. The chip layout is drawn by CSMC 0.5 渭 m 80V BCD process. In the process of drawing, the layout is arranged reasonably, and the influence of matching and interference on chip performance is considered.
【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：2307722
[Abstract]:Under the background of global energy shortage, LED (Light Emitting Diode), as a new type of green light source, has received great attention in the field of lighting. Compared with the traditional lighting mode, LED has the advantages of energy saving, environmental protection, high efficiency, long life, small volume, high reliability and so on. The quality of LED drive power directly affects the reliability of LED products. Factors to be considered are: cost, volume, output power, accuracy, power factor value, efficiency and so on. Also need to consider dimming, safety, service life and so on. The main task of this thesis is to design an off-line flyback LED constant-current driven IC.. In the design process, in order to improve the power factor, the traditional flyback controller and PFC theory are combined organically to realize the design of off-line flyback LED constant-current driving IC with PFC function. The main work of this paper is as follows: 1. The working mode of LED driver chip is analyzed. The structure of an off-line flyback LED constant current drive chip is presented, and the output current equation is derived. 2. This paper analyzes the performance indexes of each sub-module of off-line flyback LED constant current drive chip, selects the reasonable circuit structure, and simulates with Cadence Spectre to make each module of the chip achieve the required targets. The modules in this paper include reference module, oscillator, multiplier, DCM detection module, error amplifier. These modules are all given in this paper the specific implementation circuit, and completed the simulation verification. 3. The whole circuit is simulated. After completing the design of each sub-module, the whole circuit of the chip is simulated. The protection functions of the chip are verified, including open circuit protection, short circuit protection and over-temperature protection. The whole performance of the chip is tested. The constant current accuracy is 卤4.5 and the efficiency is above 90%. The chip layout is drawn by CSMC 0.5 渭 m 80V BCD process. In the process of drawing, the layout is arranged reasonably, and the influence of matching and interference on chip performance is considered.
【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】
相关重要报纸文章 前1条
1 记者 王春;[N];科技日报;2013年
相关硕士学位论文 前1条
1 黄斌;高线性度LED恒流IC设计[D];电子科技大学;2013年
，本文编号：2307722
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