毕业设计论文（开关电源）

目 录引言.....................................................................11 概述..................................................................11.1 课题来源及意义........................................................21.2 课题基本要求..........................................................21.3 课题相关背景..........................................................22 开关电源方案设计....................................................32.1 开关电源工作原理......................................................32.2 开关电源与线性电源的比较..............................................42.3 方案论证..............................................................42.3.1 方案 1...............................................................42.3.2 方案 2...............................................................52.3.3 方案 3...............................................................52.3.4 方案分析.............................................................52.3.5 总体结构设计.........................................................52.4 难点分析..............................................................62.4.1 如何提高电源工作频率.................................................62.4.2 储能电感的绕制.......................................................72.4.3 标度转换技术.........................................................72.5 控制技术选择..........................................................82.6 开关变换器结构分析与选择..............................................92.7 开关电路器件参数选择.................................................122.7.1 功率开关管的选择....................................................122.7.2 滤波电容的选择.....................................................132.7.3 储能电感的选择......................................................132.7.4 续流二极管的选择....................................................143 硬件电路设计........................................................143.1 电源电路设计.........................................................143.1.1 整流滤波电路........................................................143.1.2 开关变换电路........................................................143.1.3 分压电阻的计算......................................................153.1.4 保护电路............................................................153.2 控制电路设计.........................................................163.2.1 反馈电路设计........................................................173.2.2 四位数码显示电路设计................................................183.2.3 单片机与键盘接口电路设计............................................194 软件设计............................................................194.1 总体编程思想.........................................................204.1.1 键盘防抖动子程序....................................................204.1.2 数码显示子程序......................................................214.1.3 采样子程序..........................................................224.1.4 中断处理程序设计....................................................234.1.5PID 控制算法.........................................................244.1.6 数字滤波............................................................245 系统调试...................................