采用UC3844的反激式开关电源反馈回路的改进与设计  

A new feedback circuit of the flyback switching mode power supply based on UC3844

作　　者：陈懿[1] 童朝南[1] 韩建军[2] 

机构地区：[1]北京科技大学信息工程学院,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《电子技术应用》2008年第6期74-77,共4页Application of Electronic Technique

摘　　要：介绍了一种基于PWM控制芯片UC3844的反激式开关电源的反馈回路改进设计,详细讨论了新型反馈电路的工作过程及设计方案,采用光耦PC817和电压基准TL431组成反馈网络。该电源性能优良,具有结构简单,稳压效果好,负载调整率高等优点,具有很高的生产应用价值。A feedback circuit based on PWM controller UC3844 of flyback switching mode power supply is presented. This paper analyzes the operation course and design of a novel feedback circuit. This feedback circuit is made of optical coupler PC817 and TIA31. This power supply has good performance such as effortless circuit diagram, high voltage stability, good load adjustment rate and so on, and has better application value.

关 键 词：UC3844 反馈电路 反激式开关电源 

分 类 号：TN86[电子电信—信息与通信工程] TP335.1[自动化与计算机技术—计算机系统结构]