毕业设计-基于TL494的DC-DC开关电源设计.doc

基于TL494的DC-DC开关电源设计 摘 要 随着电子技术的高速发展,电子系统的应用领域越来越广泛,电子设备的种类也越来越多,电子设备与人们的工作、生活的关系日益密切。近年来 ,随着功率电子器件MOSFET)、PWM技术及开关电源理论的发展 ,新一代的电源开始逐步取代传统的电源电路。该电路具有体积小，控制方便灵活，输出特性好、纹波小、负载调整率高等特点PWM脉冲控制器设计小汽车中的音响供电电源，利用MOSFET管作为开关管，可以提高电源变压器的工作效率，有利于抑制脉冲干扰，同时还可以减小电源变压器的体积。 关键词：IGBT，PWM，推挽电路，半桥电路，单端正激 BASED ON THE DC-DC TL494 SWITCHING POWER SUPPLY ABSTRACT With the rapid development of electronic technology, electronic systems, more and more extensive applications, the types of electronic equipment, more and more electronic equipment and people work and live closer and closer. In recent years, with the power electronic devices (such as IGBT, MOSFET), PWM switching power supply technology and development of the theory, a new generation of power began to gradually replace the traditional power supply circuits. The circuit is small, flexible to control the output characteristics of a good, ripple, load adjustment rate and so on. Switching power supply in the power adjustment control work in the off state, with low power consumption, high efficiency, wide voltage range, low temperature rise, and other outstanding advantages of small size, the communication equipment, CNC equipment, Instrumentation, video audio, home appliances so widely used in electronic circuits. High frequency converter switching power supply so many forms of commonly used with push-pull converter, full bridge, half bridge, single-ended forward and the form of single-ended flyback. In this thesis, two-side driver IC - TL494 PWM pulse output of the controller design car audio power supply in use as a switch MOSFET, can improve the efficiency of the power transformer, is conducive to impulse noise suppression, but also can reduce the size of the power transformer. KEY WORDS: IGBT，，Push-pull circuit，Half bridge circuit Single-ended forward目　录 前　言 1 第1章 开关电源基础技术 2 1.1 开关电源概述 2 1.1.1 开关电源的工作原理 2 1.1.2 开关电源的组成 3 1.1.3 开关电源的特点 3 1.2 开关电源的分类 4 1.3 电源电路组成 4 1.4开关电源典型结构 6 1.4.1串联开关电源结构 6 1.4.2并联开关电源结构 6 1.5 电力场效应晶体管MOSFET