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1、浙江機電職業(yè)技術學院電氣電子工程學院畢業(yè)設計說明書白光LED燈驅動電路設計摘要對于一般照明而言,人們更需要白色的光源。作為一種新型的光源,白光LED更具有無污染、長壽命、耐震動和抗沖擊的鮮明特點。雖然白光LED的發(fā)光效率正逐步提高,但是LED燈配套的驅動器性能不佳,故障率高,成為了LED推廣應用的瓶頸。本文介紹了一種照明用LED高效驅動電路的設計方法。本設計采用單獨的驅動電路。通過脈寬調制方式來調節(jié)LED燈的亮度;采用開關電源供電方式,輸入電壓范圍廣、抗干擾性好、驅動效率高,保證了該驅動板在不同場合、不同區(qū)域都能正常使用。關鍵詞:LED;照明;高效;驅動WhiteLEDlampdri
2、vercircuitdesignAbstractForgenerallighting,peopleneedmorewhitelightsources.Asanewlightsource,whiteLEDwithpollution-free,long-life,vibrationandshockresistanttothedistinctcharacteristics.Atpresent,theluminousefficiencywhiteLEDisgraduallyimproving,thecommercializationofthedevicehasreachedthelevelo
3、ftheincandescentlamp,butthefactshouldnotbeoverlookedthattheLEDlightsandsupporting,thedriverdidnotkeepupwithatimelymanner,thedrivecircuitpoorperformance,faultRateishighandpromotetheuseofLEDbecomethebottleneck,therearemanytechnicalissuesneedtostudyandsolve.ThispaperintroducesakindofLEDlightingeff
4、icientlydrivingcircuitdesignmethod.ThisdesignUSEStheseparatedriverscircuit.ThroughthepulsewidthmodulationwaytoadjustLEDlampbrightness,Usingpowerswitchmode,theinputvoltagerange,anti-jamminggood,drivingwithhighefficiency,guaranteethedrivenplateindifferentsituations,differentregionscannormaluse.Ke
5、ywords:LED;Lighting;High-efficiency;Driver24浙江機電職業(yè)技術學院電氣電子工程學院畢業(yè)設計說明書目錄摘要…………………………………………………………………………………………………………..1引言……………………………………………………………………………………………………………..3第一章緒論…………………………………………………………………………………………………..41.1LED的結構以及發(fā)光原理41.2LED用途介紹41.3白光LED燈的特點61.3.1白光LED燈的優(yōu)點61.3.2白光LED燈的缺點61.4我國白光LED發(fā)展前景6第二章
6、白光LED燈驅動電源………………………………………………………………………………….82.1LED驅動電源要求82.2LED電源的分類82.3恒流驅動的理由9第三章LED驅動器…………………………………………………………………………………………..123.1白光LED驅動器的要求123.2驅動器的分類123.2.1恒流源133.2.2電荷泵133.2.3開關電源143.3驅動電源效率15第四章LED驅動電路設計…………………………………………………………………………………..174.1芯片LM3402/LM3402HV電路性能………………………………………………………………..174
7、.2PWM調光……………………………………………………………………………………………184.3輸出開路……………………………………………………………………………………………..18結論……………………………………………………………………………………………………………...20參考文獻………………………………………………………………………………………………………...21致謝…………………………………………………………………………………………………………….