【正文】 本科畢業(yè)論文 (設(shè)計 ) 題 目 ： 多路輸出開關(guān)電源的設(shè)計 Multioutput Switching Power Supply 摘 要 本文比較全面地闡明了開關(guān)電源的基本原理。首先介紹了開關(guān)電源的發(fā)展趨勢，然后介紹了電路拓?fù)浣Y(jié)構(gòu)，并分析它們的優(yōu)缺點。再后介紹了開關(guān)電源的控制原理，并簡單介紹了隔離技術(shù)。當(dāng)然也介紹了有關(guān)軟開關(guān)的技術(shù)。在此基礎(chǔ)上，設(shè)計了一個計算機用 多路數(shù)出 開關(guān)電源。這個開關(guān)電源為 220V交流輸入， 177。5V， 177。12V輸出，頻率為 50kHz。首先對主電路進 行了設(shè)計，即設(shè)計了一個半橋型電路。其次，對開關(guān)電源的控制電路、驅(qū)動電路、保護電路進行設(shè)計，控制電路以 SG3525為核心。 關(guān)鍵詞 開關(guān)電源 多路輸出 SG3525 電壓型控制 Abstract The fundamental of the switching power supply is illustrated in this paper. Firstly, the development tendency is introduced. And then the main circuit of the power supply is introduced, and the parison between them is given. Last, introduce the control theory and also introduce the isolation technology. Of course the soft switching technique is also introduced. And then the Multioutput Switching Power Supply was designed. The switching power supply is AC220V input and 177。5V, 177。12V output, the frequency is , the main circuit of the power supply is designed, the halfbridge circuit. Secondly, the control circuit, the driver circuit, the protect circuit of the power supply are analyzed and designed, control circuit is centered on SG3525. Keywords switching power Multioutput SG3525 voltage control 目 錄 第 1章 引言 ............................................................................................................. 1 電源技術(shù)的發(fā)展及方向 ......................................................................................................... 1 線性電源 ........................................................................................................................... 1 開關(guān)電源 ........................................................................................................................... 2 開關(guān)電源技術(shù)的分類 ............................................................................................................. 3 開關(guān)電源的應(yīng)用及發(fā)展趨勢 ................................................................................................. 3 本文的工作 ............................................................................................................................. 4 第 2章 開關(guān)電源電路原理與方案論證 .................................................................. 5 DC/DC變換器拓?fù)? ................................................................................................................ 5 基本 DC/DC變換器拓?fù)? ................................................................................................. 5 正激變換器 (Forward Converter) ...................................................................................... 6 反激變換器 (Flyback Converter) ...................................................................................... 6 推挽變換器 (PushPull Converter) .................................................................................... 7 半橋變換器 (Halfbridge Converter) ................................................................................. 7 全橋變換器 (FullBridge Converter) ................................................................................. 8 軟開關(guān)的選用 ......................................................................................................................... 9 軟開關(guān)技術(shù)的發(fā)展 ........................................................................................................... 9 控制電路 ............................................................................................................................... 10 開關(guān)電源控制方式 ......................................................................................................... 10 脈寬調(diào)制式開關(guān)電源的基本原理 ..................................................................................11 脈寬調(diào)制式開關(guān)電源控制方法的選擇 ..........................................................................11 開關(guān)電源電路的隔離技術(shù) ................................................................................................... 13 第 3章 電路設(shè)計 ................................................................................................... 14 具體指標(biāo)及電路結(jié)構(gòu)形式的選擇 ....................................................................................... 14 主電路的設(shè)計 ....................................................................................................................... 14 主變壓器的設(shè)計 ............................................................................................................. 14 輸出濾波電路的設(shè)計 ..................................................................................................... 15 開關(guān)器件及二極管的設(shè)計 ............................................................................................. 16 控制電路的設(shè)計 ................................................................................................................... 18 總體控制方案 ................................................................................................................. 18 PWM控制器的設(shè)計 .................................................................................................... 18 驅(qū)動電路的設(shè)計 ............................................................................................................. 22 保護電路的設(shè)計 ............................................................................................................. 23 小結(jié) ................................................................................................................................. 24 結(jié)束語 ...................................................................................................................... 26 謝 辭 ...................................................................................................................... 27 參考文獻 .................................................................................................................. 28 1 第 1章 引言 隨著電力電子技術(shù)的發(fā)展，電力電子設(shè)備與人們的工作、生活的關(guān)系日益密 切，而任何電子設(shè)備都離不開 可靠的電源。 進入 80年代計算機電源全面實現(xiàn)了 開關(guān)電源化，率先完成計算機的電源換代。 進入 90年代開關(guān)電源相繼進入各種 電子、電器設(shè)備