【正文】 電子工程系畢業(yè)設(shè)計(jì)論文 I 摘要 針對(duì)晶體管串聯(lián)提供穩(wěn)壓電源的具有體積很大而且笨重的工頻變壓器，體積和重量都很大的濾波器，占用較大空間，質(zhì)量較大，效率較低不適用現(xiàn)在電子技術(shù)的發(fā)展的的缺點(diǎn)，提出了發(fā)展新型電源的意見(jiàn)。為了能夠適用電力電子越小型化、輕型化的要求，開(kāi)關(guān)電源隨之出現(xiàn)。 開(kāi)關(guān)電源采用功率半導(dǎo)體作為開(kāi)關(guān)元件，通過(guò)周期性通斷開(kāi)關(guān)，控制開(kāi)關(guān)元件的占空來(lái)調(diào)整輸出電壓，因?yàn)殚_(kāi)關(guān)電源是直接對(duì)電網(wǎng)電壓進(jìn)行整流、濾波、調(diào)整，不需要電源變壓器，工作頻率高，濾波電容小、電感小，所以體積相對(duì)較小，而且開(kāi)關(guān)電源的功耗較低，對(duì)電網(wǎng)的適用能力強(qiáng)，所以開(kāi) 關(guān)電源的應(yīng)用逐漸取代了傳統(tǒng)的電源。開(kāi)關(guān)電源的發(fā)展促使了電力電子器件朝著輕薄化的發(fā)展，開(kāi)關(guān)電源有多種拓?fù)浣Y(jié)構(gòu)，選擇合適的拓?fù)浣Y(jié)構(gòu)，合適的器件，是設(shè)計(jì)開(kāi)關(guān)電源的重中之重。 關(guān)鍵字 ：開(kāi)關(guān)電源；拓?fù)浣Y(jié)構(gòu)；穩(wěn)壓管；芯片 電子工程系畢業(yè)設(shè)計(jì)論文 II Abstract Series to provide power supply for the transistor with large and bulky sizefrequency transformers, size and weight are great filters, occupy a larger space, the quality of larger, less efficient not apply to the development of electronic technology is now the paper proposed the development of new power views. In order to apply more power electronics miniaturization and light requirements, switching power supply soon. Switching power supply using power semiconductor devices as switches, through periodic onoff switch, control switch to adjust the air ponent of the total output voltage, because switching power supply is directly rectified mains voltage, filter, adjustment, no power transformer, high frequency, filter capacitance, inductance is small, so relatively small size, low power consumption and switching power supply on the application of strong power, so switch power gradually replaced the traditional power. Switching power supply prompted the development of power electronic devices toward the light of the development of a variety of switching power supply topology, select the appropriate topology, the appropriate device, is the top priority of switching power supply design. Keywords： switch power supply； Topology Structure； stabilivolt； Chip 電子工程系畢業(yè)設(shè)計(jì)論文 III 目錄 摘要 .................................................................................................................................I Abstract ......................................................................................................................... II 目錄 .............................................................................................................................. III 第一章 緒論 .................................................................................................................. 1 開(kāi)關(guān)電源的產(chǎn)生 .............................................................................................. 1 開(kāi)關(guān)電源產(chǎn)生的時(shí)代背景 .................................................................. 1 開(kāi)關(guān)電源的產(chǎn)生 .................................................................................. 1 開(kāi)關(guān)電源的發(fā)展 .............................................................................................. 2 我國(guó)的開(kāi)關(guān)電源的發(fā)展 ........................................................................ 2 國(guó)外開(kāi)關(guān)電源的發(fā)展 ............................................................................ 3 開(kāi)關(guān)電源發(fā)展的整體趨勢(shì) .................................................................... 4 開(kāi)關(guān)電源的現(xiàn)狀 .............................................................................................. 5 本章小結(jié) ................................................................................................................. 5 第二章 開(kāi)關(guān)電源的幾種結(jié)構(gòu) ...................................................................................... 6 boost 電路 ......................................................................................................... 6 電路圖 ............................................................................................ 6 boost 電路特點(diǎn) ....................................................................................... 7 buck 電 路 .......................................................................................................... 8 buck 電路圖 ............................................................................................ 8 buck 電路的工作原理 ............................................................................ 8 buck 電路的特點(diǎn) .................................................................................... 9 正激電路 ........................................................................................................ 10 正激電路圖 .......................................................................................... 10 正激電路的工作原理 .......................................................................... 10 正激電路的特點(diǎn) .................................................................................. 12 反激電路 ........................................................................................................ 12 反激電路圖 .......................................................................................... 12 反激電路的工作原理 .......................................................................... 12 反激電路的特點(diǎn) .................................................................................. 14 本章小結(jié) ............................................................................................................... 14 第三章 電路的選擇 .................................................................................................... 15 電路拓?fù)漕愋偷倪x擇 .................................................................................... 15 電路拓?fù)浣Y(jié)構(gòu)選擇要注意的問(wèn)題 ....................................................... 15 拓?fù)浣Y(jié)構(gòu)的對(duì) 比分析 ........................................................................... 15 反激變壓器的主要方程 ................................................................................ 17 變壓器磁芯的選擇和匝數(shù)的計(jì)算 ................................................................ 18 變壓器的磁芯的選擇 .......................................................................... 18 變壓器的匝數(shù)的計(jì)算 .......................................................................... 20 磁芯等的各種損耗 .............................................................................. 21 本章小結(jié) .....................................................