【正文】 職業(yè)技術(shù)學(xué)院 畢 業(yè) 論 文 題目： 照明 LED 驅(qū)動電源的設(shè) 計 學(xué) 生： XXX 學(xué) 號： XXX 院 （系）： 職 業(yè) 技 術(shù) 學(xué) 院 專 業(yè)： XXX 指導(dǎo)教師： XXX 200 年 月 日 I 照明 LED 驅(qū)動電源的設(shè)計 摘 要 隨著電力電子技術(shù)的發(fā)展， LED 由于環(huán)保、壽命長、光電效率高等眾多優(yōu)點，近年來在各行業(yè)應(yīng)用得以快速發(fā)展，同時，由于近年來的開關(guān)電源在電子電器各行業(yè)中占了非常重要的位置，由此驅(qū)動 LED 的開關(guān)電源就成了關(guān)注熱點。 理論上， LED 的使用壽命在 10 萬小時以上，但在實際應(yīng)用過程中，由于驅(qū)動電源的設(shè)計及驅(qū)動方式選擇不當(dāng)，使 LED 極易損壞。我們設(shè)計 LED 驅(qū)動電源時，有必要知道LED 電流、電壓特性，由于 LED 的生產(chǎn)廠家及 LED規(guī)格不同，電流、電壓特性均有差異。因此對驅(qū)動電源的設(shè)計提出了嚴(yán)格要求。根據(jù) LED 電流、電壓變化特點，采用恒流驅(qū)動方式，是比較理想的 LED驅(qū)動方式，它能避免 LED 正向電壓的改變而引起電流變動，同時恒定的電流使 LED的亮度穩(wěn)定。因此眾多廠家選用恒流方式驅(qū)動 LED，從而設(shè)計的開關(guān)電源就需要一個能恒流的直流驅(qū)動電源。傳統(tǒng)的開關(guān)電源控制集成電路具有效率高、輸出穩(wěn)定、可靠性高，并可實現(xiàn)遠(yuǎn)程控制等功能。完全適合用來驅(qū)動 LED的開關(guān)電源。 本文主要通過設(shè)計一個恒流驅(qū)動電源來驅(qū)動 LED。通過各種電力電子組件和電力電子電路組成一個恒流的電源，達到設(shè)計的要求。 關(guān)鍵詞 ： LED 驅(qū)動電路 , 開關(guān)電源，恒流 II The Design of LED Lighting Drive Power ABSTRACT With the power of the development of electronic technology, LED because of environmental, long life, high efficiency photoelectric many advantages, In recent years in all sectors to rapid application development, while In recent years, the switching power supply in electrical and electronic industries accounted for a very important position. This drives the LED Switching Power Supply concerns have bee hot focus. Theoretically, the service life of the LED 100,000 hours or more, but in actual application process, As the power supply designdriven approach and a poor choice, LED easily damaged. We designed LED drive power, it is necessary to know LED current and voltage characteristics. Since the LED and LED manufacturers specifications, current and voltage characteristics are different. So right drive power on the design of the strict requirements. Under the LED current and voltage characteristics, constantcurrentdriven approach is ideal LED driver, It would avoid the LED forward voltage changes caused changes in the current, constant current so that the LED brightness stability. So many manufacturers use constant current mode LED driver, thus the design of switching power supply will need a constant current of the DC power supply. Traditional SMPS control IC with high efficiency and output stability, high reliability and can remote control, and other functions. Well suited to drive the LED Switching Power Supply. This paper mainly through constantcurrent power supply circuit design to the LED driver. Through a variety of electronic ponents and electrical power electronic circuits posed of a constant current power supply, meet design requirements. III Key words: LED drive circuit ,Switching power supply， Constantcurrent IV 目 錄 1 概 述 ................................................................. 1 本課題研究背景及意義 .............................................. 1 開關(guān)電源的發(fā)展概況 ................................................ 2 開關(guān)電源和 LED 的國內(nèi)外研究現(xiàn)狀 .................................... 4 開關(guān) 電源和 LED 的技術(shù)性能 .......................................... 4 2 LED 照明開關(guān)電源電路分析 ............................................... 7 LED 照明開關(guān)電源的組成電路 ........................................ 7 組成電路的綜述 ............................................... 7 電路功能介紹 ................................................. 9 輸入 EMI 濾波器設(shè)計 ............................................... 10 EMI 電源濾波器的類型 ........................................ 11 基本設(shè)計 .................................................... 11 高頻變壓器設(shè)計 ................................................... 12 綜合分析 ................................................... 12 參數(shù)計算 ................................................... 13 輸入整流濾波電路設(shè)計 ............................................. 16 電源系統(tǒng)框圖及各部分介紹 .................................... 16 主電路結(jié)構(gòu)及其工作原理 ...................................... 17 輸出平滑電路設(shè)計 ................................................. 19 整流二極管的選取 ............................................ 19 濾波電感設(shè)計 ................................................ 19 輸出濾波電容參數(shù)計算 ........................................ 20 穩(wěn)壓電路 ......................................................... 20 原理圖和電路圖 .............................................. 21 組件選擇和參數(shù)的選定 ........................................ 21 3 反饋和保護電路設(shè)計 ................................................... 22 工作原理 ......................................................... 22 軟啟動電路設(shè)計 ................................................... 23 短路保護 ......................................................... 23 開關(guān)電源的接地處理要點 ........................................... 24 4 PWM 控制電路 .......................................................... 24 組件選擇和基本原理應(yīng)用 ........................................... 25 接線方式 ......................................................... 27 V 5 結(jié) 論 ............................................................... 28 致 謝 .................................................................. 30 參考文獻 ...................................