文档介绍：基于UC3842 的多输出开关电源设计 刘俊 1 楚君 2 郭照南 1 王玲 3 ( 411101 2. 湘潭大学信息工程学院湖南湘潭 411105 3. 湖南大学电气与信息工程学院湖南长沙 410082 ) 摘要:本文阐述了一种基于 UC3842 PWM 控制器的新型多路输出反激式开关电源电路的设计。该设计详细给出了变压器、漏感消除电路、启动电路以及电压电流反馈电路的设计过程。实验结果表明该电源性能优良。作为电机控制的电源模块,具有很高的应用价值。 关键词: 电流型 PWM ;UC3842 ;反激式开关电源 中图分类号:TN492 文献标志码:B Design of Multi-output Switching Power Supply based on UC3842 LIU Jun 1, CHU Jun 2, GUO Zhao-nan 1, WANG Ling 3 ( Institute of Engineering Department of Electrical and Information Engineering ,Xiangtan,411101,china 2. College of Information Engineering, Xiangtan University, Xiangtan,411105,China 3. College of Electric and Information Engineering, HunanUniversity,Changsha,410082,China ) Abstract: The design of a new multi-output switching power supply based on UC3842 is proposed in this paper. The design of transformer, leakage inductance elimination circuit, start circuit and voltage and current feedback circuit is introduced in detail. Experiment results show that the power supply has good can be used for motor control as a power module and has better application value. Key words: current PWM; UC3842; flyback switch power 0 引言 近年来,随着电源技术的飞速发展,开关稳压电源朝着高频化,集成化的方向发展,开 关电源已经得到广泛的应用。高频开关稳压电源与线性电源相比,具有如下的优点:①效率高;②体积小、重量轻;③稳压范围广;④性能灵活, 驱动能力强;⑤可靠性高, 当开关损坏时, 也不会有危及负载的高电压出现。 而传统的开关电源普遍采用电压型PWM 技术。电流型PWM 是近年兴起的新技术,与电压型PWM 比较,电流型PWM 开关电源