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1、 摘要 稳压电源是实现电源转换和电力输送的重要设备。当今时代，农业，能源，交通，通信和电力行业等领域发展迅速， 同时也对电源提出了更高的要求， 如节能，轻便，节材，环保，安全，可靠等方面。这就使得电源工作者不断追求探索相关的技术，做出更好的电源产品，以满足各行各业的需求。开关电源是一种新型电源设备，相比传统的线性电源，它的科技含量高，低能耗，使用方便，并取得了良好的经济效益。本文介绍了开关电源的工作原理、各种工作方式，它的长处和短处，设计方法以及开关电源未来设计方向，并在此基础上，对开关电源进行设计。设计分成三个模块，即辅助电源模块， PWM控制模块和升压电路部分，其中PWM控制模块为本电路的
2、核心。确定电路设计方案后，使用Multisim10 对电路进行仿真，并对电路参数进行优化配比，力图使电路脉动小，输出电压是稳定、范围可调，从而达到设计的要求。 关键词 开关电源，脉宽调制，稳压，Multisim 10Abstract：Regulated power supply is the important equipment to achieve the power conversion and electricity transmission. In modern times,agriculture, energy, transportation, communications and
3、 power industry are all in fast development. Power supply must undertake the more responsibility such as energy, materials, weight reduction, environmental protection, safety and reliability. This has been making the power workers continuously explore related technologies, to make the better product
4、s in order to satisfy the demands of all walks of life. Switching power supply is a new type of power equipment, compared with the traditional linear power supply, it has a higher technological content, low energy consumption, easy to use, and has achieved good economic benefits.This paper describes
5、 the various working principle and all kinds of way to work of switch power supply, its advantages，disadvantages,design method and its design direction in the future. Then we begin to design the switching power supply based on the above. Design is divided into three modules, namely the auxiliary pow
6、er supply module, PWM control module and a booster circuit, Among them，PWM control module as the core of the circuit. After determine the circuit design, using the Multisim 10 to simulate the circuit, and optimized and matched the circuit parameters as far as possible to make circuit pulse small, ma
7、ke the output voltage stable, adjustable range, to achieve the design requirements.Key words： switch power supply, pulse width modulation, voltage regulator, Multisim 10.目录1绪论 .11.1开关电源的发展背景 . .11.2开关电源的基本原理与组成特点 .11.2.1开关稳压电源的基本工作原理 . .11.2.2开关电源的特点 .21.2.3开关电源的基本原理 .31.3开关电源的分类 .31.4开关稳压电源的发展 .61.
8、4.1国际发展史状况 .61.4.2国内发展情况 .71.5稳压开关电源的发展趋势 .71.6开关电源的技术指标与基本设计要求 .92开关变换电路 . .112.1滤波电路 .112.2反馈电路 .112.2.1电流反馈电路 . .112.2.2电压反馈电路 . .122.3电压保护电路 .123 UC3842 电流型控制器 .143.1UC3842 简介 . .143.1.1UC3842 的特点 .143.1.2UC3842 的引脚及其功能 .143.1.3UC3842 的内部结构 .153.2UC3842 的典型应用电路 . .163.2.1UC3842 控制的同步整流电路 .163.2.2反激式开关电源 .183.2.3升压型开关电源 . .184利用 UC3842设计开关稳压电源 . .204.1电源设计基本指标 .204.2具体电路设计 .204.2.1启动电路 . .204.2.2 PWM 脉冲控制驱动电路 .224.2.3电路输出部分的设计 . .244.3电路整体分析 .285开关稳压电源的测试及仿真 . .295.1仿真软件 Multisim 10 概述 .295.2仿真结果 .305.3设计问题及解决方法 .32总结 . .33致谢 . .
