DC-DC开关变换器建模、仿真与补偿网络设计研究

发布时间：2018-06-06 00:16

本文选题：DC-DC开关变换器 + Saber仿真　；参考：《安徽大学》2014年硕士论文

【摘要】：在开关电源的设计过程中,开关变换器的建模和仿真是至关重要的一个环节,精确的系统动态模型是设计出高质量的闭环控制回路的基础,合理的闭环补偿网络是控制效果好坏的关键。借助于仿真软件,对系统进行仿真则可以比较精确地预测系统的输入输出特性及动态性能,并能反复修改和优化电路参数,可以大大缩短开发时间。本文先是系统介绍了PWM型DC/DC开关变换器的几种基本拓扑,它们是组成各种开关电源主电路的基础,由它们可以延伸变化出许许多多的实际应用的开关电源拓扑。然后介绍了两种最为常用的仿真方法即Simulink下的系统级仿真和专业仿真软件Saber下的元件级仿真,本文中主要是用到了Saber仿真。介绍了PWM型DC/DC开关变换器的常见的几种建模方法,并分别运用状态平均法、电路平均法对全面考虑了实际电路寄生参数的Buck、Boost变换器进行了详细建模,得到了考虑寄生参数、可以直接运用于工程实际的小信号模型,并在专业的电源仿真软件Saber中通过网络分析元件对环路扫频,得到了实际的频率特性以证实建模的正确性。研究了开关变换器闭环补偿网络的设计及运用Matlab及Matlab控制工具箱的Sisotool工具对开关变换器补偿网络进行设计的方法,总结和分析了不同控制模式下的补偿方案,最后以CCM模式下电压控制型Buck变换器为例,用传统的配置零极点的方法,结合Sisotool强大的交互式功能设计了类型3补偿网络,同时还在Sisotool中运用PID调节自整定参数功能设计了PID补偿网络,并在Saber里分别对得到的实际电路进行了仿真,比较了两种补偿网络的实际效果,指出了传统配置零极点设计补偿网络方法的缺陷并提出了改进。
[Abstract]:In the design process of switching power supply, the modeling and simulation of switching converter is an important link, and the accurate dynamic model of the system is the basis of designing a high quality closed-loop control loop. A reasonable closed-loop compensation network is the key to the control effect. With the help of simulation software, the system can accurately predict the input and output characteristics and dynamic performance of the system, modify and optimize the circuit parameters repeatedly, and greatly shorten the development time. In this paper, several basic topologies of PWM type DC/DC switching converter are introduced systematically, which are the basis of the main circuit of various switching power supply, which can extend and change the switching power supply topology of many practical applications. Then two most commonly used simulation methods, system-level simulation under Simulink and component-level simulation under professional simulation software Saber, are introduced. Saber simulation is mainly used in this paper. This paper introduces several common modeling methods of PWM type DC/DC converter, and uses state averaging method and circuit average method to model the PWM boost converter which takes into account the parasitic parameters of the actual circuit in detail, and the parasitic parameters are taken into account. It can be directly applied to the small signal model of engineering practice, and the frequency characteristics of the loop can be obtained by the network analysis element in the professional power supply simulation software Saber to verify the correctness of the modeling. This paper studies the design of closed loop compensation network of switching converter and the method of designing the compensation network of switching converter using Sisotool tool of Matlab and Matlab control toolbox, and summarizes and analyzes the compensation scheme under different control modes. Finally, taking the voltage-controlled Buck converter in CCM mode as an example, the type 3 compensation network is designed by using the traditional method of collocating zero poles and combining the powerful interactive function of Sisotool. At the same time, the PID self-tuning parameter function is used to design the PID compensation network in Sisotool, and the actual circuit is simulated in Saber, and the actual results of the two compensation networks are compared. The defects of the traditional zero pole design compensation network method are pointed out and the improvement is put forward.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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