单端正激式开关电源主电路设计—毕业设计1.doc

摘要： 电源是各种电子设备不可或缺的组成部分，其性能优劣直接关系到电子设备的技术指标及能否安全可靠工作。目前，开关电源因具有体积小、重量轻、效率高、发热量低、性能稳定等优点而逐渐取代传统技术制造的相控稳压电源，并广泛应用于电子设备中。 本设计的单端正激式开关电源是一种间接直流变流技术，本设计以正激电路为主体，采用以TOPSwitch系列开关电源集成芯片TOP244Y为核心的脉宽调制电路实现交-直-交-直变流，输出稳压稳频的直流电。 关键词 开关电源；正激电路；变压器；脉宽调制； ABSTRACT Power is an indispensable part of electronic equipment, its performance directly related to electronic equipment technical indicators and safe work can. At present, switching power supply for has the advantages of small size, light weight, high efficiency, low calorific value and stable performance advantages and replace traditional technology of phased manostat, and widely used in electronic equipment. The design of the single straight separate-excited switching power supply is a kind of indirect dc converter technology, this design was adopted for the main circuit, induced by TOPSwitch series of switch power integration chip TOP244Y as the core of the pulse width modulation circuit implementation delivered straight into - - - the voltage output variable flow straight, dc frequency stability. KEY WORDS Switching power supply；Is induced circuit；Transformer；Pulse width modulation 目 录 TOC \o 1-4 \h \z \u HYPERLINK \l _Toc263063196 前 言 PAGEREF _Toc263063196 \h 3 HYPERLINK \l _Toc263063197 1. 开关电源的发展及趋势 PAGEREF _Toc263063197 \h 4 HYPERLINK \l _Toc263063198 1.1 开关电源的发展历史 PAGEREF _Toc263063198 \h 4 HYPERLINK \l _Toc263063199 1.2 开关电源的发展趋势 PAGEREF _Toc263063199 \h 4 HYPERLINK \l _Toc263063200 2. 开关电源概念及基本原理 PAGEREF _Toc263063200 \h 6 HYPERLINK \l _Toc263063201 2.1 开关电源概念 PAGEREF _Toc263063201 \h 6 HYPERLINK \l _Toc263063202 2.1.1 基本概念 PAGEREF _Toc263063202 \h 6 HYPERLINK \l _Toc263063203 2.1.2 开关电源通常由六大部分组成 PAGEREF _Toc263063203 \h 6 HYPERLINK \l _Toc263063204 2.2 开关电源各部分电路基本原理 PAGEREF _Toc263063204 \h 6 HYPERLINK \l _Toc263063205 2.2.1 脉宽调制式开关电源的基本原理 PAGEREF _Toc263063205 \h 6 HYPERLINK \l _Toc263063206 2.2.2 TOPSwitch—GX系列TOP244Y芯片 PAGEREF _Toc263063206 \h 7 HYPERLINK \l _Toc263063207 2.2.3 单相二极