【正文】 好的電源產(chǎn)品，以滿足各行各業(yè)的要求。 共 45 頁 第 1 頁 摘 要 穩(wěn)壓 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、通信等領(lǐng)域迅猛發(fā)展，對(duì) 電源 產(chǎn)業(yè)提出個(gè)更多、更高的要求，如節(jié)能、節(jié)材、減重、環(huán)保、安全、可靠等。開關(guān)電源是一種新型的電源設(shè)備，較之于傳統(tǒng)的線性電源，其技術(shù)含量高、耗能低、使用方便，并取得了較好的經(jīng)濟(jì)效益。設(shè)計(jì)分為三個(gè)模塊進(jìn)行，分別 為輔助電源模塊、 PWM 控制模塊、升壓電路部分，其中 PWM 控制電路為電源設(shè)計(jì)的核心。 關(guān)鍵詞 ：開關(guān)電源 ，穩(wěn)壓 ，脈寬調(diào)制，功率 共 45 頁 第 2 頁 ABSTRACAT Power is to achieve power conversion and power transmission major equipment. In the information age, agriculture, energy, transportation, munications and other areas Power of the source industry make a greater and higher requirements， such as energy, materials, weight reduction, environmental protection, safety and reliability. This has forced the power workers have been exploring the technology for a variety of rural customs, the power to make the best products to meet the requirements of all walks of life. Switching power supply is a new type of power supply, pared to traditional linear power supply, high technology, low energy consumption, easy to use, and has achieved good economic results. This paper describes the various switching power supply works, its advantages and disadvantages, design and direction of future development, based on the design of the switching power supply. Design is divided into three modules, namely, auxiliary power module, PWM control module, boost circuit part, which PWM control circuit for the power supply design of the core. Determine the circuit design, the use of Multisim 10 simulate the circuit, and the ratio of the circuit parameters, circuit parameters as far as possible to achieve the best, to stabilize the output voltage to achieve the design requirements. KEY WORDS: Switching Power Supply， Stabilivolt， PWM， power， 共 45 頁 第 3 頁 目 錄 第一章 開關(guān)電源簡介 ............................................... 5 開關(guān)電源的發(fā)展背景 ................................................................................. 5 開關(guān)電源的基本原理與組成特點(diǎn) ............................................................. 5 開關(guān)穩(wěn)壓電源的基本工作原理 ...................................................... 5 開關(guān)電源的基本原理 ...................................................................... 6 開關(guān)電源的特點(diǎn) .............................................................................. 7 開關(guān)穩(wěn)壓電源的發(fā)展 ................................................................................. 7 國際發(fā)展史狀況 .............................................................................. 7 國內(nèi)發(fā)展情況 .................................................................................. 9 開關(guān)電源的分類 ......................................................................................... 9 穩(wěn)壓開關(guān)電源的發(fā)展趨勢 ....................................................................... 12 開關(guān)電源的技術(shù)指標(biāo)與基本設(shè)計(jì)要求 ................................................ 14 第二章 開關(guān)變換電路 .............................................. 16 濾波電路 ................................................................................................... 16 反饋電路 ................................................................................................... 16 電流反饋電路 ................................................................................ 16 電壓反饋電路 ................................................................................ 17 電壓保護(hù)電路 ........................................................................................... 17 第三章 UC3842.................................................... 19 UC3842 簡介 ............................................................................................ 19 UC3842 的 引腳及其功能 ........................................................... 19 UC3842 的內(nèi)部結(jié)構(gòu) ................................................................... 20 UC3842 的使用特點(diǎn) ................................................................... 21 UC3842 的典型應(yīng)用電路 ...................................................................... 22 反激式開關(guān)電源 ............................................................................ 22 UC3842 控制的同步整流電路 ................................................... 23 3 . 升壓型開關(guān)電源 ........................................................................... 25 第四章 利用 UC3842 設(shè)計(jì)開關(guān)穩(wěn)壓電源 ............................... 27 電源設(shè)計(jì)指標(biāo) ........................................................................................ 27 具體電路 設(shè)計(jì) ........................................................................................ 27 啟動(dòng)電路 ........................................................................................ 27 PWM 脈沖控制驅(qū)動(dòng)電路 ............................................................. 29 電路輸出部分的設(shè)計(jì) ................................................................. 32 電路整體分析 ........................................................................................... 37 第五章 電源的測試及仿真 .......................................... 38 仿真軟件 Multisim 10 概述 ................................................................... 38 共 45 頁 第 4 頁 電路測試 ................................................................................................. 38 仿真結(jié)果 .............................................................................................. 40 設(shè)計(jì)問題及解決方法 ...................................................................... 42 總 結(jié) ............................................................ 43 參考資料 .......................................................... 44 致 謝 ............................................................ 45