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目 录
引言 ................................................................................................................................................1
1 概述.........................................................................................................................................1
1.1 课题来源及意义 ....................................................................................................................2
1.2 课题基本要求.........................................................................................................................2
1.3 课题相关背景.........................................................................................................................2
2 开关电源方案设计............................................................................................................3
2.1 开关电源工作原理 ................................................................................................................3
2.2 开关电源与线性电源的比较................................................................................................4
2.3 方案论证.................................................................................................................................4
2.3.1 方案 1....................................................................................................................................4
2.3.2 方案 2....................................................................................................................................5
2.3.3 方案 3....................................................................................................................................5
2.3.4 方案分析...............................................................................................................................5
2.3.5 总体结构设计.......................................................................................................................5
2.4 难点分析.................................................................................................................................6
2.4.1 如何提高电源工作频率 ......................................................................................................6
2.4.2 储能电感的绕制 ..................................................................................................................7
2.4.3 标度转换技术.......................................................................................................................7
2.5 控制技术选择.........................................................................................................................8
2.6 开关变换器结构分析与选择................................................................................................9
2.7 开关电路器件参数选择......................................................................................................12
2.7.1 功率开关管的选择............................................................................................................12
2.7.2 滤波电容的选择...............................................................................................................13
2.7.3 储能电感的选择 ................................................................................................................13
2.7.4 续流二极管的选择............................................................................................................14
3 硬件电路设计 ...................................................................................................................14
3.1 电源电路设计 ......................................................................................................................14
3.1.1 整流滤波电路 ....................................................................................................................14
3.1.2 开关变换电路 ....................................................................................................................14
3.1.3 分压电阻的计算 ................................................................................................................15
3.1.4 保护电路 ............................................................................................................................15
3.2 控制电路设计 ......................................................................................................................16
3.2.1 反馈电路设计 ....................................................................................................................17