【正文】 About current surge when start in wide voltage, corresponding control circuit of startup is designed in this paper. Finally, to depress Electromagic Interference (EMI), EMI filter is designed at input of switching power supply specially. Simulates parts of circuit using simulation software of OrCAD Pspice A/D, selects circuit ponents, designs and debuggs sample. And then the data from experiment is analyzed and pared with simulating waveforms, experimental result is satisfying, high power factor is realized and technology of output voltage following along with changing of input is came true successfully,conversion efficiency is improved obviously. The aim and direction of next task has been put forward at the end of this paper. Key words: Switching Power Supply； Power Factor Correction； Synchronous Rectifier；Simulation and experiments IV 目 錄 摘要 第一章 緒 論 .........................................................1 線性電源和開關(guān)電源的對比 .................................................................................. 1 線性電源 ..................................................................................................... 1 開關(guān)電源 ..................................................................................................... 1 開關(guān)電源發(fā)展概況 ................................................................................................ 2 發(fā)展簡史 ..................................................................................................... 2 國內(nèi)發(fā)展現(xiàn)狀 .............................................................................................. 3 目前面臨 的問題 .......................................................................................... 3 功率因數(shù)校正技術(shù)簡介 ......................................................................................... 4 功率因數(shù)校正的由來 ................................................................................... 4 諧波的危害及功率因數(shù)校正的意 義 .............................................................. 6 功率因數(shù)校正技術(shù)的分類 ............................................................................ 7 同步整流技術(shù)概況 ................................................................................................ 9 同步整流技術(shù)的作用 ................................................................................... 9 同步整流技術(shù)的分類 ................................................................................. 10 本課題的工作內(nèi)容 .............................................................................................. 12 第二章 有源功率因數(shù)校正電路 ............................................13 總體方案設計及技術(shù)指標 .................................................................................... 13 技術(shù)指標 ................................................................................................... 13 總體方案設計 ............................................................................................ 13 拓撲電路的選擇 .................................................................................................. 14 Boost 變換器工作原理 ......................................................................................... 15 CRM 工作模式下 APFC 主電路結(jié)構(gòu)框圖 ............................................................. 16 控制芯片的選擇 ........................................................................................ 18 有源功率因數(shù)校正控制芯片 TDA4863 簡介 ................................................ 18 有源功率因數(shù)校正電路的設計 ............................................................................. 19 有源功率因數(shù)校正主電路的設計 ................................................................ 19 有源功率因數(shù)校正控制電路的設計 ............................................................ 25 第三章 二次變換設計 ...................................................29 拓撲結(jié)構(gòu)的選擇 .................................................................................................. 29 Flyback 變換器的原理 ......................................................................................... 29 Flyback 變換器的控制芯片 .................................................................................. 30 控制芯片 NCP1207 .................................................................................... 31 變壓器的設計 ............................................................................................ 32 主開關(guān)管的選擇 ........................................................................................ 35 MOSFET 的驅(qū)動和緩沖電路 ...................................................................... 35 輸出濾波電路設計 ..................................................................................... 36 控制芯片外圍電路設計 .............................................................................. 37 電壓反饋調(diào)節(jié)器 ........................................................................................ 38 V 開關(guān)電源啟動控制及吸收電路 ............................................................................. 39 啟動控制電路設計 ..................................................................................... 39 吸收電路參數(shù)計算 ..................................................................................... 40 同步整流電路設計 .............................................................................................. 42 電流驅(qū)動同步整流技術(shù)的工作原理 ............................................................ 42 同步整流電路設計 ..................................................................................... 43 開關(guān)電源的電磁兼容性 ....................................................................................... 44 EMI 和 EMC ............................................................................................. 44 EMI 設計 .................................................................................................. 45 第四章 電源系統(tǒng)的仿真及結(jié)果分析 ........................................48 APFC 電路仿真波形及分析 ................................................................................. 48 DC/DC 電路仿真波形及分析 .........