毕业论文___100w反激式开关电源设计研究.doc

目 录 摘 要 1 前 言 2 1 绪论 4 1.1 开关电源的发展现状和发展趋势 4 1.1.1 开关电源发展现状 4 1.1.2 开关电源发展趋势 4 1.2 课题背景和研究意义 4 2 开关电源概述 6 2.1 开关电源的分类和结构 6 2.2 开关电源的工作原理 6 2.2.1 开关电源电路的组成 6 2.2.2 反激式开关电源的工作原理 7 3 设计方案的比较与与选择 8 3.1 本课题的设计要求 8 3.2 系统设计整体架构 8 3.3 开关电源控制电路的比较选择 8 3.3.1 控制电路分析 8 3.3.2 UC3842的工作原理和特点 9 3.3.3 TOP243Y工作原理和特点 11 3.4 电力场效应管MOSFET 13 3.5 TL431 15 3.6 系统原理图 15 3.6.1 系统原理 16 3.6.2 电路主要参数的设计 17 4 开关电源系统仿真 20 4.1 NI Multisim 10系统简介 20 4.2 本课题仿真结果 21 致 谢 24 参 考 文 献 24 100W反激式开关电源设计研究 摘 要：随着电力电子技术的发展，开关电源的应用越来越广泛。开关电源以其小型、轻量和高效率的特点，被广泛地应用于各种电气设备和系统中，其性能的优劣直接关系到整个系统功能的实现。开关电源有多种类型，其中反激式开关电源由于具有线路简单，所需要的元器件少，能够提供多路隔离输出等优点而广泛应用于小功率电源领域。 随着计算机技术的发展,开关电源的建模仿真研究对电源的设计起着重要的辅助作用,不仅可以缩短开发周期,而且可以节约成本,所以电源的建模仿真研究已成为当今开发开关电源必不可少的部分,而且随着仿真软件的完善,使得开关电源的仿真越来越简单,可以仿真的部分与功能也越来越多。 本文设计了一款100W反激式开关电源。 关键词：反激；开关电源；拓扑结构；芯片 Abstract：With the development of power electronics, switching power supply used more and more widely. Switching power supply with its small, light weight and high efficiency characteristics, is widely used in various electrical equipment and systems, the merits of their performance is directly related to the realization of the whole system functions. There are many types of switching power supply, including flyback switching power supply With simple circuit, the fewer components needed, can provide multiple advantages, such isolated output is widely used in low-power power supply field. With the development of computer technology, the modeling and simulation of Switching Power Supply have assistant effects on power design and study; it can not only shorten the researching and development cycle but also reduce the design cost. The modeling and simulation research of power supply have become the essential part for Switching Power Supply researching and developing, and as simulation software improved, the simulation of Switching Power Supply is simpler, the part and function of Switching Power Supply can be simulation also more and more. The paper designed a 100W