基于555定时器的开关电源的设计

提出了一种中小功率开关电源设计,该电源是用555定时器等组成的脉宽调整电路构成稳压源。主要介绍了开关电源的主要组成部分的原理图及设计、555定时器及有其组成的脉宽调整电路和功率MOSFET管。此电源电路结构简单,功耗小,控制线性好,稳压范围宽,能实现较好的控制,输出电压在(3～20)V连续可调,电流0～5A。

Design of the switching power supply based on 555-timer

A novel switching power supply is developed,which is composed of 555 timer pulse width adjustment circuit constitute regulated source.This thesis mainly introduces a switching power supply of the main components of schematics and design,555-timers and a pulse width adjustment of its composition control circuits and power MOSFET.The power circuit of simple structure,low power consumption,better control of linear,wide voltage range,which can achieve better control,output voltage(3 ～ 20) V continuously adjustable,current 0 ～ 5A.