目录
一、 前言......................................................................................................................................3
二、 电路实现的功能与电路各部分元件作用说明 ............................................................3
2.1 电路实现的功能 ................................................................................................................................3
2.2 电路各部分元件作用说明 .................................................................................................................3
2.2.1 防浪涌,限流电路................................................................................................................................3
2.2.2 EMI 滤波电路..........................................................................................................................................4
2.2.3 整流倍压电路.........................................................................................................................................5
2.2.4 DC-DC buck 电路.....................................................................................................................................5
2.2.5 线性稳压电路.........................................................................................................................................6
三、 电路各部分元件选型分析与计算..................................................................................6
3.1 防浪涌,限流电路 ............................................................................................................................6
3.1.1 ZNR1 压敏电阻 .......................................................................................................................................6
3.1.2 FS1 保险管 ..............................................................................................................................................7
3.1.3 NTC1 热敏电阻 .......................................................................................................................................7
3.2 EMI 滤波电路.....................................................................................................................................7
3.2.1 安规 X 电容 CX1,CX2 ...........................................................................................................................7
3.2.2 放电电阻 R59,R43,R1 .......................................................................................................................7
3.2.3 安规 Y 电容 CY1,CY2 ............................................................................................................................7
3.2.4 共模电感 FL1 ..........................................................................................................................................8
3.3 整流倍压电路 ....................................................................................................................................8
3.3.1 整流桥 DB1 .............................................................................................................................................8
3.3.2 铝电解电容 E1,E2 ................................................................................................................................8
3.4 DC-DC buck 电路 ................................................................................................................................8
3.4.1 电源芯片 U4 ...........................................................................................................................................9
3.4.2 工字电感 L1 ............................................................................................................................................9
3.4.3 二极管 D1,D13 .....................................................................................................................................9
3.4.4 电解电容 E9 ............................................................................................................................................9