【正文】 rch field of modern power electronics, and derive a lot of new research directions. The subject of this design is the design of 10kW DC switching power supply, the working principle of DC switching power supply: the grid to the AC rectified filter circuit into a DC, after high frequency inverter circuit into a highfrequency alternating current, high frequency alternating current transformer by highfrequency transformer will, then high frequency AC singlephase bridge rectifier filter circuit for dc. According to the design scheme to determine the working principle of DC switching power supply, selection of threephase uncontrolled rectifier filter circuit as the input circuit of main circuit, paring the advantages and disadvantages of various changes through the analysis, selection of phaseshift full bridge converter, high frequency transformer design, selection of single phase bridge rectifier circuit as output circuit of the main circuit, on the voltage regulation part, a detailed analysis of the UC3825 control chip control circuit based on PWM. And the IGBT drive circuit, feedback circuit, protection circuit, auxiliary power supply and a flow equalization circuit is designed according to the requirement of the task. The design of 10kW DC switching power supply has the characteristics of adjustable output voltage, output current, low ripple. The experimental results show that it meets the design requirement, which verifies the correctness of the theoretical analysis, has a broad application prospect. Keywords: converter； Switching power supply； highfrequency transformer；PWM control 本科生畢業(yè)設(shè)計(jì)（論文） III 目 錄 第 1章 緒論 ............................................................................................................. 1 開關(guān)電源的簡介 ........................................................................................ 1 開關(guān)電源的發(fā)展及國外現(xiàn)狀 .................................................................... 1 國內(nèi)開關(guān)電源的發(fā)展及現(xiàn)狀 .................................................................... 3 第 2章 系統(tǒng)分析和設(shè)計(jì)方案確定 ......................................................................... 5 系統(tǒng)整體概述 ............................................................................................. 5 變換器的選擇 ............................................................................................. 6 控制電路的實(shí)現(xiàn) ......................................................................................... 6 整流濾波電路的選擇 ................................................................................ 8 輸入整流濾波回路 ......................................................................... 8 輸出整流濾波回路 ......................................................................... 8 第 3章 開關(guān)電源主電路的設(shè)計(jì) ............................................................................. 9 開關(guān)電源的設(shè)計(jì)要求 ................................................................................ 9 主電路組成框圖 ........................................................................................ 9 輸入整流濾波電路 ....................................................................... 10 移相式全橋變換器的設(shè)計(jì) ............................................................ 12 輸出整流濾波電路 ....................................................................... 16 第 4章 控制電路的設(shè)計(jì) ....................................................................................... 19 PWM 集成控制器的基本原理 ................................................................ 19 高速脈寬調(diào)制器 UC3825 ....................................................................... 19 主要特點(diǎn) ....................................................................................... 21 極限參數(shù) ....................................................................................... 21 內(nèi)部電路工作原理 ....................................................................... 22 UC3825 的調(diào)試 ........................................................................................ 24 反饋電路的設(shè)計(jì) ...................................................................................... 25 第 5章 保護(hù)電路的設(shè)計(jì) ....................................................................................... 28 軟啟動電路的設(shè)計(jì) .................................................................................. 28 過流過壓保護(hù) .......................................................................................... 29 第 6章 輔助電源設(shè)計(jì) ........................................................................................... 32 第 7章 均流電路設(shè)計(jì) ........................................................................................... 34 本科生畢業(yè)設(shè)計(jì)（論文） IV 均流電路概述 .......................................................................................... 34 開關(guān)電源并聯(lián)系統(tǒng)常用的均流方法 ...................................................... 34 第 8章 結(jié)論 ........................................................................................................... 37 參考文獻(xiàn) ................................................................................................................. 38 致 謝 ....................................................................................................................... 39 附 錄 1.................................................................................................................... 40 附 錄 2.................................................................................................................... 41 本科生畢業(yè)設(shè)計(jì)（論文） 1 第 1章 緒論 開關(guān)電源的簡介 開關(guān)電源是利用現(xiàn)代電力電子技術(shù)，控制開關(guān)管開通和關(guān)斷的時間比率，維持穩(wěn)定輸 出電壓的一種電源，一般由脈沖寬度調(diào)制（ PWM）控制 IC 和 MOSFET構(gòu)成。目前，開關(guān)電源以小型、輕量和高效率的特點(diǎn)被廣泛應(yīng)用幾乎所有的電子設(shè)備，是當(dāng)今電子信息產(chǎn)業(yè)飛速發(fā)展不可缺少的一種電源方式。 開關(guān)電源和線性電源相比，二者的成本都隨著輸出功率的增加而增長，但二者增長速率各異。隨著電力電子技術(shù)的發(fā)展和創(chuàng)新，使得開關(guān)電源技術(shù)在不斷地創(chuàng)新，這一成本反轉(zhuǎn)點(diǎn)日益向低輸出電力端移動，這為開關(guān)電源提供了廣泛的發(fā)展空間。 現(xiàn)代開關(guān)電源有兩種：一種是直流開關(guān)電源；另一種是交流開關(guān)電源。直流開關(guān)電源的核心是 DC/DC 轉(zhuǎn)換器。也就是說，直流開關(guān)電源的分類與 DC/DC 轉(zhuǎn)換器的分類是基本相同的，DC/DC 轉(zhuǎn)換器的分類基本上就是直流開關(guān)電源的分類。在隨后的 本科生畢業(yè)設(shè)計(jì)（論文） 2 20 年內(nèi)，由于半導(dǎo)體工藝的進(jìn)步，可控硅的電壓、電流額定值及其它特性參數(shù)得到了不斷提高和改進(jìn)，滿足了通信設(shè)備