【正文】 ............................................. 1 Abstract ................................................................................................................................ 1 Key words ............................................................................................................................ 1 1 開關(guān)電源概述 .................................................................................................................. 2 開關(guān)電源的定義與分類 ................................................................................................ 2 開關(guān)電源的基本工作原理 與組成 ................................................................................ 2 開關(guān)電源的基本工作原理 ......................................................................................... 2 開關(guān)電源的組成 ......................................................................................................... 3 開關(guān)電源待解決的問題及發(fā)展趨勢(shì) ............................................................................ 3 開關(guān)電源待解決的問題 ............................................................................................. 3 開關(guān)電源的發(fā)展趨勢(shì) .............................................................................................. 4 2 設(shè)計(jì)方案 ........................................................................................................................... 5 本課題選題意義 ............................................................................................................ 5 方案的設(shè)計(jì)要求 ............................................................................................................ 5 選取的設(shè)計(jì)方案 ............................................................................................................ 5 3 反激 式高頻開關(guān)電源系統(tǒng)的設(shè)計(jì) ................................................................................... 6 高頻開關(guān)電源系統(tǒng)參數(shù)及主電路原理圖 .................................................................... 6 單端反激式高頻變壓器的設(shè)計(jì) .................................................................................... 7 高頻變壓器設(shè)計(jì)考 慮的問題 ..................................................................................... 7 單端反激式變壓器設(shè)計(jì) ............................................................................................. 8 高頻開關(guān)電源控制電路的設(shè)計(jì) .................................................................................. 11 PWM 集成控制器的工作原理與比較 ................................................................... 11 工作原理 ..................................................................................................... 12 的使用特點(diǎn) ................................................................................................. 14 反饋電路及保護(hù)電路的設(shè)計(jì) ...................................................................................... 15 過壓、欠壓保護(hù)電路及反饋 ................................................................................... 15 過流保護(hù)電路及反饋 ............................................................................................... 15 變壓器設(shè)計(jì)中注意事項(xiàng) .............................................................................................. 16 4 總結(jié) ................................................................................................................................. 16 致謝 .................................................................................................................................... 17 參考文獻(xiàn) ............................................................................................................................ 17 1 開關(guān)電源設(shè)計(jì) 電氣工程及自動(dòng)化專業(yè)學(xué)生 指導(dǎo)教師 摘 要 ： 單端反激式開關(guān)電源具有輸出紋波小、輸出穩(wěn)定、體積小、重量輕、效率高以及具有良好的動(dòng)態(tài)響應(yīng)性能等許多優(yōu)點(diǎn) ， 被廣泛應(yīng)用在小功率開關(guān)電源的設(shè)計(jì)中。為此本論文以反激式高頻開關(guān)電源為設(shè)計(jì)方向而展開，對(duì)高頻變壓器的認(rèn)知及所注意的問題，其中包括磁芯損耗、繞組損耗、溫升以及磁芯要求。其次是控制電路的設(shè)計(jì)，首先我們要對(duì) PWM 集成控制器原理的有所了解，在此基礎(chǔ)上保護(hù)兩種控制模式分別是電壓模式和電路模 式。 關(guān)鍵詞 ： 高頻單端反激式變壓器 PWM集成控制器 UC3842集成控制器 保護(hù)電路 Switching Power Supply Design Student majoring in electrical engineering and automation YinJirui Tutor KongXiangxin Abstract： Singleended fly back switching power supply with output ripple small， stable output， small volume， light weight， high efficiency and good dynamic response performance and many other advantages， is widely used in the design of low power switching power supply. Therefore this thesis design direction for the flyback type high frequency switching power supply， the cognition of highfrequency transformer and attention problems， including magic core loss and winding loss and tempe