【正文】 電路 提供保護電路中正在運行中各種參數(shù)和各種儀表數(shù)據(jù)。 整流與濾波：將電網(wǎng)交流電源直接整流為較平滑的直流電。這部分電路目前已集成化，制成了各種開關(guān)電源用集成電路。另外 ， 開關(guān)電源的發(fā)展與應(yīng)用在安防監(jiān)控，節(jié)約能源、節(jié)約資源及保護環(huán)境方面都具有重要的意義。 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。 第一章 開關(guān)電源概述 .............................................................................................................. 1 開關(guān)電源簡介 .......................................................................................................... 1 開關(guān)電源的原理和組成特點 .................................................................................. 1 開關(guān)電源的原理 ............................................................................................ 1 開關(guān)電源組成特點 ........................................................................................... 2 開關(guān)電源應(yīng)用及發(fā)展前景 .......................................................................................... 3 開關(guān)電源應(yīng)用 ................................................................................................... 3 開關(guān)電源發(fā)展前景 ........................................................................................... 5 第二章 開關(guān)電源設(shè)計方案 ...................................................................................................... 7 變換器設(shè)計方案論證 .................................................................................................. 7 單端反激式 開關(guān)電源變換器 ........................................................................... 7 單端正激式開關(guān)電源變換器電路： ............................................................... 8 自激式開關(guān)電源變換器電路 .......................................................................... 8 推挽式開關(guān)變換器 .......................................................................................... 9 半橋式開關(guān)電源變換器 ................................................................................. 10 方案的設(shè)計選擇 ........................................................................................................ 11 電源設(shè)計指標 ................................................................................................. 11 電源設(shè)計方案選擇 ......................................................................................... 11 第三章 開關(guān)電源系統(tǒng)設(shè)計 .................................................................................................... 12 開關(guān)電源主電路設(shè)計 ............................................................................................... 12 輸入濾波電路的設(shè)計 ..................................................................................... 12 輸入整流濾波電路的設(shè)計 ............................................................................. 13 高頻變壓器的設(shè)計 ......................................................................................... 14 輸出整流濾波電路設(shè)計 ................................................................................. 17 控制電路分析設(shè)計 ................................................................................................... 18 反饋電路及保護電路的設(shè)計 ................................................................................... 21 反饋電路 的設(shè)計 ............................................................................................. 21 保護電路的設(shè)計 ............................................................................................. 24 第四章 單端反激式開關(guān)電源電路總結(jié)與研究 .................................................................... 29 總體電路圖分析 ........................................................................................................ 29 單端反激式開關(guān)電源的研究 ................................................................................... 31 附錄 .......................................................................................................................................... 34 致謝 .......................................................................................................................................... 37 河南理工大學畢業(yè)設(shè)計（論文）說明書 1 第一章 開關(guān)電源概述 開關(guān)電源 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，開關(guān)電源一般由脈沖寬度調(diào)制（ PWM）控制 IC 和 MOSFET 構(gòu)成。 關(guān)鍵詞 ：開關(guān)電源； uc3842；高頻；變壓；單端反激； Abstract As the global emphasis on energy issues， electronics product of energy dissipation problem will bee more and more to reduce the standby power consumption, improving the efficiency of power supply bee a presses for solution of the the traditional linear regulated power supply circuit has simple structure, reliable operation, but it there is a low efficiency, large volume, copper iron consumption big, the high working temperature and the adjusting range is small. In order to improve the efficiency, people developed a switch regulated power supply, its efficiency can reach more than 85%, wide voltage range, at the same time also has regulated characteristics such as high precision, do not use the power transformer, stabilized voltage supply is a kind of ideal. This design of switch power supply with singleended flyback topology, using UC3842 as main control chip of switch power supply, one by one, research status and development prospects of the switch power and the design principle and circuit structure are introduced, including the design of highfrequency transformer and the design of control circuit is the main content of paper, and the basic principle of switch power supply, characteristics and development prospect are briefly introduced. Due to the switching power supply reliability and security of the basic principles of design, the article involves the design and analysis of the circuit protection module. Key words: switching power supply。傳統(tǒng)的線性穩(wěn)壓電源雖然電路結(jié)構(gòu)簡單、工作可靠，但它存在著效率低、體積大、銅鐵消耗量大，工作溫度高及調(diào)整范圍小等缺點。為了提高效率，人們研制出了開關(guān)式穩(wěn)壓電源，它的效率可達 85% 以上，穩(wěn)壓范圍寬，同時還具有穩(wěn)壓精度高、不使用電源變壓器等特點，是一種較理想的穩(wěn)壓電源。 Uc3842. High frequency。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)也在不斷地創(chuàng)新。線性電源成本在某一輸出功率點上，反而高于開關(guān)電源。 開關(guān)電源的原理和組成特點 開關(guān)電源的原理 （ 1） 一般的開關(guān)電源電路包括整流濾波電路、高頻變換電路、控制電路（ pwm/pfm）、保護電路等模塊?？刂齐娐酚脕碚{(diào)整高頻開關(guān)元件的開關(guān)時間比例，以達到穩(wěn)定輸出電壓的目的。 逆變：將整