TL494开关电源的设计

论文编号:JD926   论文字数:10101,页数:22

摘要
 本设计主要介绍了开关电源的发展历程，未来发展趋势，以及开关电源的优缺点和抗干扰措施。本设计采用典型的半桥开关电源结构设计形式，以TL494作为控制核心器件，并采用辅助电源供电方式为其供电，虽然设计复杂了点，但有利于增大主电源的输出功率。采用场效应管作为开关器件，其导通和截止速度很快，导通损耗小，这就为开关电源的高效性提供保障。同时，电路中辅以过压过流保护电路，为系统的安全工作提供保障，无源PFC电路的引入，降低了电磁串扰，达到绿色环保的目的。输出电压可调，使其可适用于不同场合。
关键词：脉冲宽度调制；半桥变换；TL494

Abstract
 The design of the main power switch on the course of development, future development trends, and the advantages and disadvantages of switching power supply and anti-jamming measures. The design of a typical half-bridge switching power supply design of the structure to control TL494 as the core device and auxiliary power supply by way of its electricity, although the design is complex, but is conducive to increasing the output power of the main power. FET used as a switching device, and its on-deadline fast, conduction losses small, which is the high efficiency switching power supply to provide protection. At the same time, supplemented by over-voltage circuit overcurrent protection circuits, for the security system to provide protection, the introduction of passive PFC ircuit,reducing  the electromagnetic crosstalk, to achieve the purpose of environmental protection. Output voltage adjustable so that it could be applied to different occasions. Key words: Pulse Wide Moduation; Half-bridge transformation; TL494
 
 

目    录
摘要 I
Abstract II
第1章 开关电源简介 1
    1.1  开关电源发展简况 1
    1.2  开关电源若干技术问题 2
    1.3 开关电源电路的基本构成和原理 5
        1.3.1基本构成 5
        1.3.2开关电源的基本工作原理 6
    1.4开关电源的优点 7
    1.5开关电源的发展前景 8
第2章 开关电源设计 9
    2.1整流滤波电路 9
    2.2 控制电路设计 10
        2.2.1 TL494介绍 10
        2.2.2 TL494的工作原理 11
        2.2.3开关电源控制电路设计 11
    2.3  半桥变换电路设计 13
    2.4 副电源设计 15
    2.5输出电路设计 16
第3章 设计评估 17
    3.1 设计评估 17
 3.2 改进意见 17
参考文献 18
致谢 19