【正文】 畢業(yè)設(shè)計(jì)（論文）說明書 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 摘 要 隨著電力電子技術(shù)的飛速發(fā)展 ,各種電子設(shè)備對(duì)于電源的性能、重量、體積、效率提出了更高的要求 ,目前開關(guān)電源的控制方式多釆用電壓控制型技術(shù)。電壓控制型存在響應(yīng)速度慢等缺點(diǎn)。針對(duì)電壓控制型電路的缺點(diǎn) ,最近十幾年發(fā)展起來了電流控制型技術(shù) ,它具有很好的快速響應(yīng)， 因此 ,對(duì)其進(jìn)行研究設(shè)計(jì)具有十分重要的意義。 本論文是在研究分析了開關(guān)電源的 基本 原理以及 UC3846 芯片與 TLP250 芯片的功能與特性的基礎(chǔ)上，設(shè)計(jì)了一種基于 UC3846 的電流型全橋拓?fù)浣Y(jié)構(gòu)的恒流高頻開關(guān)電源。 主要進(jìn)行了 輸入整流電容濾波、高頻變壓器的設(shè)計(jì)、驅(qū)動(dòng)電路 和 控制電路等主要元器件和電路模塊的選型與參數(shù)設(shè)計(jì)。論文所設(shè)計(jì)的開關(guān)電源的輸入為市電220V交流，輸出電壓為 24V，電流為 5A，開關(guān)頻率為 90khz。 最后基于原理分析與計(jì)算，搭建全橋拓?fù)鋵?shí)驗(yàn)平臺(tái)。實(shí)驗(yàn)結(jié)果表明：輸入整流濾波電壓符合理論分析，控制電路 的調(diào)試也基本符合要求。 關(guān)鍵詞 : PWM 控制 ； 全橋電路 ； 高頻變壓器 ； UC3846 畢業(yè)設(shè)計(jì)（論文）說明書 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 畢業(yè)設(shè)計(jì)（論文）說明書 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ Abstract With the rapid development of power electronics technology, various kinds of electronic equipment for the performance of the power, weight, volume and efficiency put forward higher request, the control mode of switch power supply more bright type with voltage control technology. Voltage control type shortings slow response speed and so on. For voltage control circuit fault type, type the current control technology developed in recent ten years, it has the very good quick response, therefore, to study design has the very vital significance. This paper is lie on the research and analysis of the full bridge topology of switch power supply principle , UC3846 and TLP250 chip on the basis of the function and characteristics. Designed a current mode based on UC3846 full bridge topology structure of high frequency switching power supply with constant current. It contains input rectifier capacitance filter,highfrequency transformer design,drive circuit, control circuit of the main ponents and circuit module selection and parameter design. The paper design of switch power supply input from the mains AC 220 V, output voltage is 24 V, current is 5 A, the switching frequency of 90 khz. The last it based on the principle analysis and calculation, build full bridge topology experiment platform. Experimental results show that the input rectifier filter voltage accord with theoretical analysis, the control circuit of the PWM pulse meet the requirements, has the good waveform features, various technical indicators can meet the power requirements of experimental platform. Key words: PWM control。 full bridge topology。 high frequency transformer。 UC3846 畢業(yè)設(shè)計(jì)（論文）說明書 共 38 頁 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 第 1 頁 目 錄 1 緒論 .................................................................................................................................. 3 課題研究背景 ....................................................................................................... 3 開關(guān)電源的基本原理 ........................................................................................... 3 開關(guān) 電源發(fā)展趨勢(shì) ............................................................................................... 4 開關(guān)電源的分類 ................................................................................................... 5 本文主要做的工作 ............................................................................................... 5 本論文結(jié)構(gòu) ........................................................................................................... 6 本章小結(jié) ............................................................................................................... 6 2 開關(guān)電源的控制模式介紹 .............................................................................................. 7 2. 1 PWM 電壓控制模式 ........................................................................................... 7 PWM 電流控制模式 ............................................................................................ 8 電流控 制模式簡(jiǎn)介 .................................................................................... 8 峰值電流控制模式 .................................................................................... 9 滯環(huán)電流控制模式 .................................................................................. 10 斜坡補(bǔ)償電路的基本原理和設(shè)計(jì) ..................................................................... 10 斜率補(bǔ)償?shù)幕驹?.............................................................................. 11 斜坡補(bǔ)償電路的設(shè)計(jì) .............................................................................. 13 本章小結(jié) ............................................................................................................. 14 3 DC/DC 全橋變換電路參數(shù)設(shè)計(jì) .................................................................................. 15 輸入整流與濾波電路 ......................................................................................... 15