论文总字数：23233字

摘 要

在开关电源技术飞速发展这个大背景下，以提高开关变换器系统的响应速度为目的各种开关变换器控制方式的研究显得极为重要，本文的研究的变换器控制方式为峰值电流控制模式，可有效提高开关变换器系统的响应速度。

以开关电源为背景，引出Buck变换器。简要介绍Buck变换器的工作原理和工作模态，包括开关变换器相应元件的选取标准和应力分析。详细介绍了Buck变换器的控制方式，对其中的电压控制方式和电流控制方式做了工作原理分析比较相互之间的优缺点。使用状态空间法对Buck变换器进行建模并得出它的小信号电路模型。对峰值电流控制系统的控制原理以电路图的形式进行较为详细的分析，对其中电流控制环和电压控制环的功能进行了介绍。针对电压控制环的补偿环节进行了补偿电路设计和电路元件参数的计算。最后对Buck变换器主电路进行了仿真分析。

仿真结果表明，峰值电流控制模式可有效减少开关变换器系统的输出误差，且对系统所受的各项扰动具有较快的响应速度。

关键词：Buck变换器 峰值电流 控制 仿真

The design of the Buck converter peak current control mode

Abstract

In switching power supply technology rapid development under this big background, to improve the response speed of the switching converter system for the purpose of all kinds of switch converter control method research is very important, this article studies the converter control mode for the peak current control mode, which can effectively improve the response speed of the switching converter system.

Against the background of switch power supply, lead to the Buck converter. This paper briefly introduces the working principle of the Buck converter and working mode, including switch converter corresponding element selection standards and stress analysis. Buck converter control mode was introduced in detail, the voltage control and current control method of them to do the work principle of analyzing and comparing the advantages and disadvantages of each other. Using the state space method of Buck converter is modeled and its small signal circuit model are obtained. The peak current control principle of the control system of a detailed analysis is made in the form of a circuit diagram, on which the current control loop and voltage control loop function are introduced. Part of the voltage control loop compensation on the compensation circuit design and circuit components parameters. Finally, the Buck converter main circuit are analyzed in the simulation.

The simulation results show that the peak current control mode can effectively reduce the output error of switch converter system, and the system of the disturbance has faster response speed.

Keywords: Buck converter;peak current ;control; simulation

目录

摘要..............................................................I

Abstract..........................................................II

第一章 绪论.....................................................1

1.1 课题背景............................................................1

1.1.1 开关电源的分类................................................1

1.1.2 开关电源的应用范围............................................2

1.1.3 开关电源的发展趋势............................................2

1.2 国内外研究现状......................................................2

1.2.1 功率半导体器件................................................3

1.2.2 软开关技术....................................................4

1.3 论文研究内容及结构安排.............................................4

第二章 Buck变换器.............................................5

2.1 Buck变换器结构及工作原理............................................5

2.2 Buck 变换器特点.....................................................7

2.3 Buck 变换器的控制方式...............................................7

2.3.1 电压控制模式..................................................7

2.3.2 峰值电流控制模式..............................................9

2.3.3 平均电流控制模式.............................................11

2.3.4 Buck变换器控制方式的研究现状及发展趋势.......................12

2.4 Buck变换器的工作模态分析...........................................13

2.5 本章小结............................................................15

第三章 建模与仿真.....................................................16

3.1利用空间状态平均法建模.............................................16

3.2控制系统介绍.......................................................23

3.3仿真软件介绍及结果分析.............................................26

3.4本章小结...........................................................32

第四章 总结与展望.....................................................33

4.1 本文总结..........................................................33

4.2展望未来...........................................................34

参考文献.................................................................35

致谢......................................................................37

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