【正文】 選用 .................................................................................13 光電耦合器 ........................................................................................................14 二極管 ...............................................................................................................18 開關(guān)二極管 ............................................................................................18 穩(wěn)壓二極管 ............................................................................................18 快速恢復(fù)及超快速恢復(fù)二極管 ..............................................................19 自動(dòng)恢復(fù)開關(guān) ....................................................................................................20 第三章 開關(guān)電源的設(shè)計(jì) ..................................................................................................23 第四章 雙端驅(qū)動(dòng)集成電路 TL494....................................................................................35 TL494 簡(jiǎn)介 ........................................................................................................35 2 TL494 的工作原理 .............................................................................................36 TL494 內(nèi)部電路 .................................................................................................36 TL494 管腳功能及參數(shù) ..........................................................................37 TL494 構(gòu)成的 PWM 控制器電路 ..........................................................................39 第 5 章 結(jié)論 .....................................................................................................................40 參考文獻(xiàn) ..........................................................................................................................44 附錄一 元器件清單 ..................................................................................................45 附錄二 總原理圖 .....................................................................................................46 3 第 1章 緒論 電源是實(shí)現(xiàn)電能變換和功率傳遞的主要設(shè)備、在信息時(shí)代，農(nóng)業(yè)、能源、交通運(yùn)輸、信息、國(guó)防教育等領(lǐng)域的迅猛發(fā)展，對(duì)電源產(chǎn)業(yè)提出了更多、更高的要求，如：節(jié)能、節(jié)電、節(jié)材、縮體、減重、環(huán)保、可靠、安全等。 串聯(lián)開關(guān)電源結(jié)構(gòu) ..................................................... 錯(cuò)誤 !未定義書簽。 關(guān)鍵詞 :開關(guān)電源， TL494,高頻變壓器， PWM 控制 II Switching power supply design Abstract With the development of power electronic technology and new type power ponents appear continuously, switching power supply technology obtained the rapid development, the puter, munications, power, household appliances, aerospace and other fields are widely used, and achieved significant results. Switching power supply with high efficiency, small volume, light weight and other significant characteristics. Switching power supply is the use of modern electronic technology, the control switch transistor turnon and turnoff time ratio, to maintain the stability of the output voltage of a power supply, switching power supply is usually consists of pulse width modulation and a field effect tube. Switch power supply and linear power supply, the two39。在電壓調(diào)節(jié)環(huán)節(jié)上，詳細(xì)分析 了基于 TL494 電源管理芯片 。在此基礎(chǔ)上，完成了整個(gè)系統(tǒng)的硬件電路設(shè)計(jì)和軟件程序的編制，并對(duì)電源裝置的硬件和軟件進(jìn)行了調(diào)試和修改。 目前世界各國(guó)都有 廣泛的應(yīng) 用，特別是對(duì)大容量高頻開關(guān)電源的研究和開發(fā)已成為當(dāng)今電力電子學(xué)的主要研究領(lǐng)域，并派生了很多新的研究方向。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(zhǎng)，但二者增長(zhǎng)速率各異。 I 開關(guān)電源設(shè)計(jì) 摘 要 隨 著電力電子技術(shù)的發(fā)展和新型功率元器件的不斷出現(xiàn)，開關(guān)電源技術(shù)得到了飛速的發(fā)展，在計(jì)算機(jī)、通訊、電力、家用電器、航空航天等領(lǐng)域得到廣泛應(yīng)用，取得了顯 。 開關(guān)電源是利用現(xiàn)代電子技術(shù)，控制開關(guān)晶體管開通和關(guān)斷的時(shí)間比率，維持穩(wěn)定輸出電壓的一種電源，開關(guān)電源一般由脈沖寬度調(diào)制和 場(chǎng)效應(yīng)管 構(gòu)成。 開關(guān)電源比普通的線性電源效率高， 開關(guān)電源的發(fā)展與應(yīng)用在節(jié)約能源、節(jié)約資源及保護(hù)環(huán)境方面都具有重要的意義。 本文詳細(xì)分析了 高性能、大功率直流開關(guān)電源 的工作原理，并提出 了主電路和控制電路的詳細(xì)設(shè)計(jì)方案。 在分析原理的基礎(chǔ)上，本文從三相橋式不控整流、全橋變換器、高頻變壓器、濾 波電路等環(huán)節(jié)對(duì)該系統(tǒng)的主電路進(jìn)行了闡述，同時(shí)探討了該電源系統(tǒng)實(shí)現(xiàn)大功率的解決方案，即采用多個(gè)電源模塊并聯(lián)運(yùn)行。本文研制的直流開關(guān)電源具有輸出電壓可調(diào)、輸出電流大、紋波小等特點(diǎn)。s cost as the output power increases, but the two growth rate of different. Switching power supply than ordinary linear power supply efficiency is high, the power switch in the development and application in saving energy, saving resource and protect environment has important significance. At present, all the countries in the world have a wide range of applications, particularly for large capacity high frequency switching power supply research and development have bee the main research field of power electronics, and derive a lot of new research direction. This paper presents a detailed analysis of a high performance, high power DC power supply and working principle, and has proposed the main circuit and control circuit of the detailed design scheme. On this basis, the system hardware circuit design and software program, and the power supply device hardware and software debugging and modification. Based on the analysis of the principle, this article from the threephase bridge uncontrolled rectifier, a full bridge converter, a high frequency transformer, filter circuit of the main circuit of the system are described, and discussed the power supply system of high power solutions, the use of multiple power supply modules operating in parallel. In the voltage regulating link, a detailed analysis of the power management chip based on TL494. This paper designed DC switching power supply with adjustable output voltage, output current, ripple is small wait for a characteristic. Keywords: Switching Power Supply, TL494, Highfrequency Transformer, PWM control 1 目 錄 開關(guān)電源設(shè)計(jì) ..................................................................................................................... I 摘 要 ................................................................................................................................ I 第 1 章 緒論 ...................................................................................................................... 3 第 一 章 開關(guān)電源基礎(chǔ)技術(shù) ............................................................................................... 4 開關(guān)電源概述 ........