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1、Red,GreenandBlueLED-basedWhiteLightSource:ImplementationChallengesandControlDesignSubramanianMuthuJamesGainesAdvanceTransformerCo.PhilipsResearch,10275WestHigginsRd,Rosemont,IL60018-5603345ScarboroughRoad,BriarcliffManor,NY10510Email:Subu.Muthu@Philips.
2、ComEmail:Jim.Gaines@Philips.ComAbstract—TherecentimprovementsinhighpowerlightVariationincolorpointfromreference(6500oK)emittingdiode(LED)technologywith100+lumensperLEDchipbringsolid-statelightingclosetoreality.Combiningred,greenandblue(RGB)LEDscanprovid
3、eacompactwhitelightsourcewithuniquefeaturessuchasinstantcolorvariability.However,theimplementationofanRGB-LEDlightsourcehasnumerouspracticalissuessuchassensorplacement,LEDdriving,controldesignandstabilitywithtemperatureandtime.Thiscanresultinlampoperati
4、onthatmaynotmeetthespatial,colormaintenanceandperceptionrequirementsofmanyapplications.Inthispaper,wehighlightthepracticalissuesandpresentsolutionsusinganRGB-LEDlightengineasanexample.Thespatialmixing,sensorplacement,andcontrolsystemdesignforthelighteng
5、inearediscussedandexperimentalresultsareprovided.%sensingerrorinBlueLEDoutputKeywords—LED;whitelight;colorcontrol;lightsensing;%sensingerrorinRedLEDoutputcolorfilters;tristimulusvalues.Figure1.DeviationincolorpointasafunctionofI.INTRODUCTIONerrorinfeedb
6、acksystem.Lampsbasedonhighbrightnessred,greenandblue(RGB)light-emittingdiodes(LEDs)canproducelightofnearlyanycolor,includingwhite.RGB-LEDscurrentlyyieldspatiallyfrommanycompacthighpowerLEDs.Thewall1plug-efficiency2oftypicalindividualLEDpackagesvarieslum
7、inousefficacyofabout30lumensperwattforwhitelightgeneration.Thisefficacyisexpectedtocontinuetorisefrom5to40%dependingonLEDcolor.Thus,60to95%ofdramatically[1].AdvantagesofRGB-whitelightingincludetheinputpowerislostasheat.Thisheatincreasestheinstantaneousc
8、olorchangeanddimminglevels,higherjunctiontemperatureoftheLEDs,whichinturncausestheefficiencythanphosphor-whiteLEDs,andlonglifetime.LEDcharacteristicstochange.Inaddition,theLEDTheyhavegreatpotentialinapplicationssuchasgeneralchara
