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高效率led驅(qū)動(dòng)恒流源的畢業(yè)設(shè)計(jì)(已修改)

2025-07-05 14:46 本頁面
 

【正文】 鹽城紡織職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì)(論文)高效率LED驅(qū)動(dòng)恒流源的畢業(yè)設(shè)計(jì)目 錄1概述 LED概述………………………………………………………………… 3 LED驅(qū)動(dòng)電路的概述…………………………………………………… 32課題研究背景與意義………………………………………………………… 43設(shè)計(jì)思路及方案……………………………………………………………… 5………………………………………………………… 5…………………………………………………………… 5……………………………………………………………… 5 …………………………………………………………… 6…………………………………………………………… 6…………………………………………………………… 7…………………………………………………………… 7……………………………………………………………… 7 …………………………………………………………… 8……………………………………………………… 8…………………………………………… 84電路總體結(jié)構(gòu)及設(shè)計(jì)………………………………………………………… 8 ………………………………………………… 8……………………………………………………… 8………………………………………………………… 9……………………………………………………… 9 ……………………………………………… 9……………………………………………………… 9……………………………………………………… 10……………………………………………………………… 13………………………………………………………………… 14…………………………………………………………… 145安裝與調(diào)試…………………………………………………………………… 15 …………………………………………………… 15 …………………………………………………………………… 18 …………………………………………………………………… 19……………………………………… 196結(jié)束…………………………………………………………………………… 20致謝 …………………………………………………………………………… 21參考文獻(xiàn)………………………………………………………………………… 22附錄 …………………………………………………………………………… 23附錄1 總電路原理圖………………………………………………………… 23附錄2 PCB版圖……………………………………………………………… 23高效率LED驅(qū)動(dòng)恒流源的設(shè)計(jì)摘 要目前,LED用于照明或燈飾已經(jīng)成為發(fā)展趨勢(shì),但是在大量推出大功率LED的同時(shí),與之相配套的專用驅(qū)動(dòng)電路市場(chǎng)卻還是不盡完善。很多企業(yè)采用傳統(tǒng)的變壓器降壓的方法供電,這使得LED的優(yōu)勢(shì)不能很好地發(fā)揮。恒流驅(qū)動(dòng)是最佳的LED驅(qū)動(dòng)方式,采用恒流源驅(qū)動(dòng),LED上流過的電流將不受電壓變化、環(huán)境溫度變化,以及LED參數(shù)離散性的影響,從而能保持電流的恒定,充分發(fā)揮LED的各種優(yōu)良特性。直接用市電~220V給LED燈供電的開關(guān)電源式恒流源的設(shè)計(jì)需解決降壓、整流、變換效率高、較小的體積、較低的成本、還有安全隔離等一系列問題。經(jīng)過實(shí)物電路的調(diào)試,基本上能實(shí)現(xiàn)上述要求,驗(yàn)證了設(shè)計(jì)方案的可行性。關(guān)鍵詞:功率級(jí)LED;LED恒流驅(qū)動(dòng);開關(guān)電源Design on The highefficiency LED constant current driverAbstract: at present, the LED useds for lighting or lamps and laterns to be already e developping trend, but at the time of in great quantities releasing big power LED match each other the appropriation of set with it to drive electric circuit on the market still not to the utmost lot of transformers with traditional business enterprise adoptions decline to press method power supply, this make the advantages of LED can39。t nicely develop. Constant current driver is the best drive way to LED, adopt constant current driver, the LED is upperclass to lead of the electric current won39。t be change by electric voltage, environment temperature variety, and the influence of the LED parameter longlost, thus ability holding current constant, well develop LED various good characteristic. The design which directly uses the city electricity ~ 220 Vs to flow a source to LED light the switch power supply type constant current driver needs to resolve to decline to press, mutate, Highefficiency, smaller physical volume, lower cost of the transformation efficiency, still have safety insulation etc. a series of by the adjust of real object electric circuit try, basically can carry out the abovementioned request and verified the possibility of design project.Keyword: PowerLED;LED constant current driver。Switch power supply1 概 述 LED概述LED是一種固體光源,當(dāng)它兩端加上正向電壓,半導(dǎo)體中的少數(shù)載流子和多數(shù)載流子發(fā)生復(fù)合,放出的過剩能量將引起光子發(fā)射。采用不同的材料,可制成不同顏色有發(fā)光二極管。作為一種新的光源,近年來各大公司和研究機(jī)構(gòu)對(duì)LED的研究方興未艾,使其光效得以大大提高,很多知名的大公司目前已研發(fā)并生產(chǎn)出光效達(dá)到171m/W的白色LED,已達(dá)到白熾燈的水平。和白熾燈的相比較,LED在性能上具有很多優(yōu)點(diǎn),見下表:表11白熾燈與白色LED的性能比較隨著對(duì)LED研究的進(jìn)一步深入,其光效將進(jìn)一步得到提高,而其成本將一步下降,在不久的將來LED取代白熾燈甚至熒光燈而發(fā)展成21世紀(jì)的一種主要的照明光源將成為一種趨勢(shì)。新的光源呼喚新的電子驅(qū)動(dòng)器,各大公司在致力研發(fā)新的LED的同時(shí),已于近年在全球各大開發(fā)中心開始了LED驅(qū)動(dòng)電路的研究。 LED驅(qū)動(dòng)電路的概述與熒光燈的電子鎮(zhèn)流器不同,LED驅(qū)動(dòng)電路的主要功能是將交流電壓轉(zhuǎn)換為直流
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