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1、xx大學學士學位論文大功率LED驅動電源研究摘要大功率LED以其高效、節(jié)能、環(huán)保、壽命長、可靠性高等優(yōu)點正在逐漸取代傳統(tǒng)的白熾燈、熒光燈成為新一代照明光源。隨著大功率照明LED性能的提高及生產成本的降低,其應用領域正由屏幕背光源以及一些對亮度要求不高的景觀照明領域向普通白光照明領域擴展。與此同時,與功率型LED配套的驅動集成電路的研發(fā)也由于功率型LED逐漸得到廣泛的應用而迅速的發(fā)展。本文結合大功率LED的特性及對現(xiàn)有驅動電路的分析比較,研究制定基于恒流驅動方式的大功率LED驅動電源設計方法。根據(jù)現(xiàn)有大功率LED路燈的功率資料,提出了大功率LED路燈的設計方案,并設計出相應的驅動電路。該驅動
2、電路配有線性調光功能,可根據(jù)需要,對外部部件參數(shù)進行修改,達到調光的功能,并可根據(jù)外部電路的變化,驅動不同功率的路燈,實現(xiàn)了驅動電路的多功能性,使用簡單、方便。目前,大功率LED照明技術日趨成熟,大功率LED光源功效已經達到100lm/W以上,這使得城市路燈照明節(jié)能改造成為可能。LED路燈,特別是大功率LED路燈,正以迅猛的速度沖擊傳統(tǒng)的路燈市場。而相對大功率LED路燈應用中的驅動電路也正如雨后春筍般萌發(fā)。關鍵詞 大功率LED;道路照明;驅動電源-II---xx大學學士學位論文High-PowerLEDDriverPowerResearchAbstractThehighefficiency
3、LEDlightingisgraduallyreplacingincandescentandfluorescentlightingduetoitsuniqueattributessuchashighefficiency,lowenergyconsumption,lowpollution,longlifeandhighreliability.AsthequalityofpowerLEDimprovesandthecostofpowerLEDreduces,itsapplicationfieldhasgraduallyturnedfromsignallightinganddisplayligh
4、tingtogeneralroomlighting.AlongwiththedevelopmentofpowerLED,theresearchofitsdrivingIChasalsobeengreatlyaccelerated.ThisarticleunifiesthecharacteristicofLEDandtheexistingdrivingcircuit'sanalyticalstudy,summarizesthatusesconstantcurrentdrivetypedrivehighefficiencyLEDisthemostidealway.Accordingtothee
5、xistingdataofhighefficiencyLEDStreetlight'spower,proposedthehighefficiencyLEDstreetlight'sdesignproposal,anddesignsthecorrespondingdrivingcircuit.Thisdrivingcircuithasthelineardimmingfunction,whichcanbetoregulateanexternalresistortoachievedimmingfunction,mayaccordingtotheneed,adjustanexteriorresis
6、tance,achievesdimmingfunction,andaccordingtotheexteriorelectriccircuit'schange,drivingdifferentpowerstreetlight,realizeddrivingcircuit'smulti-purpose,theusehasbeensimpleandconvenient.Atpresent,thehighefficiencyLEDlightingtechniquesaredaybydaymature,high-powerLEDlightsourcehasreachedtheefficacyof10
7、0lm/Wormore,whichmakesenergy-savingcitystreetlightingpossible.LEDstreetlamps,especiallyhigh-powerLEDstreetlamps,istherapidspeedoftheimpactofthetraditionalstreetmarket.Andrelativelyhigh-powerLEDstreetlightingappli