开关电源方案设计本科毕业设计.doc

摘要 开关电源以其效率高、体积小、重量轻等优势在很多方面逐步取代了效率低、又笨重的线性电源。电力电子技术的发展，特别是大功率器件IGBT和MOSFET的迅速发展，将开关电源的工作频率提高到相当高的水平，使其具有高稳定性和高性价比等特性。开关电源的高频变换电路形式很多, 常用的变换电路有推挽、全桥、半桥、单端正激和单端反激等形式。本论文设计了输出电压范围为85-165VAC，标识为220VAC的，测试范围一般为175-265VACWith the wide application of switching power supply in the computer, communications, aerospace, instrumentation and electrical appliances and so on, the growing demand for its people, and has put forward higher requirements for power efficiency, volume, weight and reliability. Switching power supply with its high efficiency, small size, light weight and other advantages in many respects gradually replaced the linear power supply, low efficiency, and the bulky. The development of power electronic technology, especially the rapid development of the high-power IGBT devices and MOSFET, increasing the working frequency of the switching power supply to a very high level, which has high stability and high performance characteristics. One of the main purposes of switching power supply technology is serves for the information industries. The development of information technology on power technology and put forward higher requirements, so as to promote the development of switch power supply. Many high-frequency transformation circuit switching power supply, commonly used with push-pull converter, full bridge, half bridge, forward and flyback etc.. This paper is using the PWM switching power supply Keywords: Switching power supply, switching converters, inductors, filter capacitor 目 录 第一章 绪论 5 1.1选题的背景及意义 5 1.2开关电源的发展 5 1.3设计研究内容 6 第二章 开关电源方案设计 7 2.1 开关电源工作原理 7 2.2 开关电源与线性电源的比较 8 2.2.1线性电源的缺点 8 2.2.2开关电源的优点 8 2.3 方案论证 8 2.3.1方案1 8 2.3.2方案2 9 2.3.3 方案3 9 2.3.4方案分析 9 2.3.5总体结构设计 9 2.4 难点分析 11 2.4.1如何提高电源工作频率 11 2.4.2储能电感的绕制 11 2.4.3标度转换技术 12 2.5 控制技术选择 13 2.5.1电压型控制技术 13 2.5.2 电流型控制技术 13 2.5.3电流控制型技术的优势 14 2.6 开关变换器结构分析与选择 14 2.6.1降压变换电路分析 14 2.6.2升压型变换电路 16 2.6.3Buck-Boost型变换器 16 2.7 开关电路器件参数选择 17 2.7.1功率开关管的选择 17 2.7.2 滤波电容的选择 18 2.7.3储能电感的选择 18 2.7.4续流二极管的选择