基于LLC谐振快速响应LED驱动芯片的设计仿真与实现
发布时间：2018-08-26 21:10
【摘要】：随着人们节能环保意识的日益增强,LED作为优秀的绿色照明元件以其稳定、高效的性能,受到广泛的研究。与传统照明设备直接接入市电即可驱动的使用方法不同,LED需要配合特殊的驱动电路使用,一方面给照明器件提供稳定可靠的工作环境,另一方面也可以通过高性能的驱动电路来提高LED系统的效率。LED市场不断拓展的同时也推动了LED驱动产业的进一步发展。在LED驱动设计领域中,DC/DC变换器的类型选择将直接影响芯片驱动系统的效率和应用,系统的环路响应速度与稳定性也是设计过程中需要折中处理的一对主要矛盾。针对上述问题,本文提出了一种基于LLC谐振变换且具有良好环路响应速度的LED驱动芯片。本文首先对几种常见DC/DC变换器的特点进行分析,通过简单的比较提出LLC谐振变换器具有适用于本文所设计芯片系统的特性,在此基础上着重对LLC谐振网络进行较为深入的理论研究,利用波形详细讨论变换器的工作原理,分析其高效转换的原因,再通过数学推导完成主要器件参数的设计工作。随后对本文芯片设计过程中需要用到的软件进行介绍,包括用于绘制原理图并生成仿真网表的DxDesigner软件、用于仿真并完成功能验证的Hspice软件和用于版图绘制及校验的Virtuoso和Calibre软件。然后在LLC谐振变换架构的基础上,以上述软件为设计平台完成LED驱动芯片的系统的搭建,主要包括负载网络的设计、补偿网络分析和芯片主要子模块的设计和仿真,其中包括整流放大模块、模拟调光钳位跟随模块、PWM比较模块和死区时间产生模块。最后对芯片系统的典型应用、PWM调光功能、模拟调光功能和环路响应速度进行整仿验证,同时简单介绍亮度自动补偿、错误检测保护和软启动等辅助功能,并在版图设计工作中,针对不同模块的工作特点和噪声强弱程度进行区域划分,完成主要布局布线设计。
[Abstract]:With the increasing awareness of energy saving and environmental protection, LED, as an excellent green lighting component, has been widely studied for its stable and efficient performance. Different from the traditional lighting equipment, which can be driven by direct access to electricity, LED needs to be used with special driving circuit. On the one hand, it provides a stable and reliable working environment for lighting devices. On the other hand, the efficiency of LED system can be improved by high performance driving circuit. In the field of LED drive design, the type selection of DC / DC converter will directly affect the efficiency and application of the chip drive system. The loop response speed and stability of the system are also a pair of major contradictions that need to be compromised in the design process. In order to solve the above problems, this paper presents a LED driver chip based on LLC resonant transform with good loop response speed. In this paper, the characteristics of several common DC/DC converters are analyzed, and the characteristics of LLC resonant converters are put forward by simple comparison, which are suitable for the chip systems designed in this paper. On the basis of this, the LLC resonant network is studied deeply, the working principle of converter is discussed in detail by using waveform, the reason of its high efficiency conversion is analyzed, and the design of main device parameters is completed by mathematical derivation. Then the software used in the chip design is introduced, including DxDesigner software for drawing schematic diagram and generating simulation net table, Hspice software for simulating and completing functional verification and Virtuoso and Calibre software for layout drawing and verification. Then on the basis of LLC resonant transformation architecture, the system of LED driver chip is built based on the above software, including the design of load network, the analysis of compensation network and the design and simulation of the main sub-modules of the chip, including the design of the load network, the analysis of the compensation network and the design and simulation of the main sub-modules of the chip. It includes rectifying and amplifying module, analog dimming clamp following module, PWM comparison module and dead-time generation module. Finally, the typical application of PWM dimming function, analog dimming function and loop response speed are simulated and verified. At the same time, the auxiliary functions such as brightness automatic compensation, error detection and protection and soft start are briefly introduced, and in the layout design, some auxiliary functions, such as automatic luminance compensation, error detection and protection, and soft start up, are briefly introduced. According to the working characteristics of different modules and the degree of noise intensity, the main layout and routing design is completed.
【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
本文编号：2206164
[Abstract]:With the increasing awareness of energy saving and environmental protection, LED, as an excellent green lighting component, has been widely studied for its stable and efficient performance. Different from the traditional lighting equipment, which can be driven by direct access to electricity, LED needs to be used with special driving circuit. On the one hand, it provides a stable and reliable working environment for lighting devices. On the other hand, the efficiency of LED system can be improved by high performance driving circuit. In the field of LED drive design, the type selection of DC / DC converter will directly affect the efficiency and application of the chip drive system. The loop response speed and stability of the system are also a pair of major contradictions that need to be compromised in the design process. In order to solve the above problems, this paper presents a LED driver chip based on LLC resonant transform with good loop response speed. In this paper, the characteristics of several common DC/DC converters are analyzed, and the characteristics of LLC resonant converters are put forward by simple comparison, which are suitable for the chip systems designed in this paper. On the basis of this, the LLC resonant network is studied deeply, the working principle of converter is discussed in detail by using waveform, the reason of its high efficiency conversion is analyzed, and the design of main device parameters is completed by mathematical derivation. Then the software used in the chip design is introduced, including DxDesigner software for drawing schematic diagram and generating simulation net table, Hspice software for simulating and completing functional verification and Virtuoso and Calibre software for layout drawing and verification. Then on the basis of LLC resonant transformation architecture, the system of LED driver chip is built based on the above software, including the design of load network, the analysis of compensation network and the design and simulation of the main sub-modules of the chip, including the design of the load network, the analysis of the compensation network and the design and simulation of the main sub-modules of the chip. It includes rectifying and amplifying module, analog dimming clamp following module, PWM comparison module and dead-time generation module. Finally, the typical application of PWM dimming function, analog dimming function and loop response speed are simulated and verified. At the same time, the auxiliary functions such as brightness automatic compensation, error detection and protection and soft start are briefly introduced, and in the layout design, some auxiliary functions, such as automatic luminance compensation, error detection and protection, and soft start up, are briefly introduced. According to the working characteristics of different modules and the degree of noise intensity, the main layout and routing design is completed.
【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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