说明：  本设计设计手机充电器系统，实现由交流220V电能到直流4.2V电能的转换，进而为手机等设备充电。在系统控制中采用了变压、整流、滤波、稳压、分压、电压检测等电路，并且具有一定的充电提示和充满电自动断电的功能。 本设计采用Proteus（V7.1）软件仿真进行演示。
(Based on Proteus simulation design phone charger system, implemented by 220V AC power to DC 4.2V power conversion. In control system uses a transformer, rectifier, filter, regulator, voltage divider, the voltage detection circuit, and has some tips and full power charging automatic power-off function.)