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............................................................255.1硬件模块调试....................................................
