峰值电流控制中斜坡补偿研究.doc

本科毕业设计（论文） 峰值电流控制中的斜坡补偿研究 *** 燕 山 大 学 2012年 6 月 摘 要 相比传统的线性电源，DC-DC开关电源由于具有高效率、高可靠性、体积小等优点，使其成为国内外研究的热点。电流模式DC-DC开关电源具有响应速度快、稳定性高、内在限流保护等特点在电源管理芯片中得到了广泛的运用。在这一背景下，本文以Boost变换器为例，设计峰值电流控制的斜坡补偿电路；输入电压48V，输出电压200V。 本文主要研究电流模式DC-DC开关电源中斜坡补偿理论，分析了电感电流扰动导致控制环路产生不稳定的原因，给出抑制这种不稳定因素的处理办法即斜坡补偿方法。针对此问题提出斜坡补偿设计思想，在此理论基础上完成了相应的斜坡补偿控制电路路设计。本文中完成了DC-DC开关电源系统的各个单元电路设计与分析，重点分析斜坡补偿控制电路的设计。最后采用MATLAB软件进行仿真。通过整体仿真，实现稳定电压，系统具有良好的负载调整特性和快速的稳态恢复时间和优良的电源调整率。 关键词　开关电源，峰值电流模式，斜坡补偿 Abstract The switch power possesses the advantages of high efficiency, high reliability and compact size compared with conventional linear power which becomes a pop research object home and abroad. Due to its characteristics of fast response, good stability, inherent current limiting, current-mode controller has been widely applied in power management circuits. In this background, this paper to Boost converter as an example, the design of peak current control slope compensation circuit; the input voltage 48V, output voltage 200V. This paper mainly studies the current mode switching power supply DC-DC slope compensation in theory, analysis of inductor current disturbance causes the control loop to generate unstable reason given, inhibition of the unstable factors approach that slope compensation method. The slope compensation design, on the basis of the theory to accomplish the corresponding slope compensation control circuit design. This paper completed the DC-DC switching power supply system each unit circuit design and analysis, focusing on the analysis of the slope compensation control circuit design. Finally using the MATLAB software simulation. Through the simulation, to achieve stable voltage, the system has a good load regulation characteristics and rapid steady state recovery time and excellent power adjustment rate. Keywords　 Switch power supply, peak current mode, slope compensation  目 录 摘要 I Abstract II 第1章 绪论 1 1.1 课题背景 1 1.2开关电源的发展阶段 2 1.3开关电源的发展趋势 4 1.4论文的主要内容和设计目标 4