精品毕业论文--直流开关电源设计.doc

PAGE 1 摘 要 本设计是开关电源设计,首先将开关电源与线性电源进行对比，总结了开关电源的优点,并对其当前的发展以及在发展中存在的问题进行了描述，然后在对开关电源的整体结构进行了介绍的基础上，对开关电源的主回路和控制回路进行设计：在主回路中整流电路采用单相桥式、功率转换电路采用单端正激功率转换电路、采用增加副边绕组的方法实现多路输出，其中功率转换电路（DC/DC变换器）是开关电源的核心部分，对此部分进行了重点设计；控制电路采用PWM控制，控制器采用UC3824、设计了过压保护电路、电压检测电路和电流检测电路，对各个部分的参数进行了计算并进行了元器件的选型。 【关键词】DC/DC变换器、PWM控制、整流、滤波。 Abstract In this paper,I designed a switch power supply system with three outputs: Compare the switch power with linear power at first , has summarized the advantage of the switch power ,have described its present development and there are natural questions in development. On the basis of the thing that the whole structure to the switch power has made an introduction, to the main return circuit and controlling the return circuit to design of the switch power: The rectification circuit adopts the single-phase bridge type in the main return circuit, the power changes the circuit and adopts and defies the power to change the circuit , realize by increasing the winding of one pair of sides single and well that many ways are exported, it is a key part of the switch power supply that the power changes circuit (DC/DC transformer ), have designed this part especially ; The control circuit adopts PWM to control, the controller adopts the switch power integrated controller UC3824, design the circuit to measure voltage and the circuit to el measure ectric current, selecting type of calculating and carrying on the components and parts the parameter of each part. Keyword ：DC/DC transformer , PWM control , rectification , straining waves. 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc137887075 1 概述 PAGEREF _Toc137887075 \h 1 HYPERLINK \l _Toc137887076 1.1开关电源的基本原理 PAGEREF _Toc137887076 \h 1 HYPERLINK \l _Toc137887077 1.2开关电源与线性电源的比较 PAGEREF _Toc137887077 \h 2 HYPERLINK \l _Toc137887078 1.3开关电源的发展与应用 PAGEREF _Toc137887078 \h 2 HYPERLINK \l _Toc137887079 1.4 开关电源当前存在的问题 PAGEREF _Toc137887079 \h 3 HYPERLINK \l _Toc137887080 2 整流电路的设计 PAGEREF _Toc137887080 \h 5 HY