基于UC3842开关稳压电源的设计  

Design of Switching Regulated Power Supply Based on UC3842

作　　者：黎晓贞[1] 涂敏[1] 

机构地区：[1]江西南昌大学电工电子实验中心

出　　处：《电子技术（上海）》2009年第3期11-13,共3页Electronic Technology

摘　　要：开关电源是一种效率很高的电源变换电路,通过对Boost型开关电源作详细的数学推导后得到准确数据。该系统包括整流滤波模块、DC-DC变换模块、过流保护及人机接口模块,以DC-DC变换器作系统的核心。采用UC3842作开关电源控制芯片,开关管采用耐高压,导通电阻很小的MOSFET管IRF640。输出滤波电路中用LC构成的型网络,同时输出采用单片机采样系统,可显示当前的电流和电压,且通过采样电流实现过流保护功能。Switching mode power is a high efficiency power, There is a detailed analysis to direct at Boost style of switching mode power. The DC-DC module is the core of the entire system, we choose the UC3842 and a barotolerance and low Ron MOSFET IRF640 as the switch. At the Output port, we use a filter making up of a Pi circuit of LC. Also, We use a MCU to sample the Voltage of the output, then the output current and output voltage could be displayed. Using the sampled current , current foldback function can be achieved.

关 键 词：Boost型开关电源 DC-DC变换模块 整流滤波模块 过流保护模块 

分 类 号：TN86[电子电信—信息与通信工程] TN624