Niaj hnub no, nrog rau kev loj hlob sai ntawm LEDs, high-power LEDs tau noj kom zoo dua ntawm cov qauv.Tam sim no, qhov teeb meem loj tshaj plaws ntawm lub zog hluav taws xob LED teeb pom kev zoo yog kub dissipation.Tsis zoo cua sov dissipation ua rau LED tsav lub zog thiab electrolytic capacitors.Nws tau dhau los ua lub rooj tsav xwm luv luv rau kev txhim kho ntxiv ntawm LED teeb pom kev zoo.Qhov laj thawj ntawm kev laus ntxov ntxov ntawm LED teeb qhov chaw.
Nyob rau hauv lub teeb lub tswv yim siv LED lub teeb qhov chaw, vim hais tias cov LED teeb qhov chaw ua hauj lwm nyob rau hauv ib tug tsawg voltage (VF = 3.2V), siab tam sim no (IF = 300-700mA) ua hauj lwm lub xeev, yog li ntawd lub tshav kub yog heev hnyav.Qhov chaw ntawm cov teeb pom kev zoo yog nqaim, thiab nws nyuaj rau lub radiator ntawm thaj chaw me me kom xa tawm cua sov sai.Txawm hais tias muaj ntau yam kev ua kom txias txias, cov txiaj ntsig tsis txaus siab, dhau los ua LED teeb pom kev zoo teeb meem tsis muaj kev daws teeb meem.
Tam sim no, tom qab lub teeb pom kev zoo ntawm LED teeb, 20% -30% ntawm cov hluav taws xob hluav taws xob hloov mus rau lub teeb lub zog, thiab li ntawm 70% ntawm cov hluav taws xob hluav taws xob hloov mus rau thermal zog.Yog li ntawd, nws yog qhov tseem ceeb thev naus laus zis ntawm LED teeb qauv tsim kom xa tawm ntau lub zog cua sov kom sai li sai tau.Thaum tshav kub kub zog yuav tsum tau dissipated los ntawm tshav kub conduction, tshav kub convection thiab tshav kub tawg.
Tam sim no cia peb txheeb xyuas dab tsi ua rau qhov tshwm sim ntawm LED sib koom kub:
1. Lub internal efficiency ntawm ob yog tsis siab.Thaum cov hluav taws xob ua ke nrog lub qhov, lub photon tsis tuaj yeem tsim tawm 100%, uas feem ntau txo cov cab kuj recombination tus nqi ntawm PN cheeb tsam vim "tam sim no to".Qhov hluav taws xob tam sim no lub sij hawm voltage yog lub zog ntawm qhov no.Ntawd yog, nws hloov mus rau cua sov, tab sis qhov no tsis nyob hauv lub ntsiab tivthaiv, vim tias qhov ua tau zoo ntawm cov photons sab hauv twb ze rau 90%.
2. Tsis muaj ib qho ntawm cov photons generated sab hauv tuaj yeem tua sab nraum lub nti, thiab ib feem ntawm qhov laj thawj tseem ceeb vim li cas qhov no thaum kawg hloov mus rau hauv lub zog hluav taws xob yog qhov no, hu ua quantum efficiency sab nraud, tsuas yog li 30%, feem ntau yog hloov mus rau kub.
Yog li ntawd, cov cua kub dissipation yog ib qho tseem ceeb cuam tshuam rau lub teeb pom kev zoo ntawm LED teeb.Lub dab dej kub tuaj yeem daws qhov teeb meem ntawm cov cua kub dissipation ntawm cov teeb pom kev tsis tshua muaj teeb pom kev zoo, tab sis lub dab dej kub tsis tuaj yeem daws qhov teeb meem kub dissipation ntawm cov teeb hluav taws xob siab.
LED txias daws teeb meem:
Lub tshav kub dissipation ntawm Led feem ntau pib los ntawm ob yam: lub tshav kub dissipation ntawm lub Led nti ua ntej thiab tom qab lub pob thiab lub tshav kub dissipation ntawm lub Led teeb.Led nti kub dissipation yog feem ntau cuam tshuam nrog lub substrate thiab Circuit Court xaiv txheej txheem, vim hais tias tej LED yuav ua tau ib lub teeb, yog li ntawd lub tshav kub generated los ntawm LED nti yog nws thiaj li dispersed rau hauv huab cua los ntawm lub teeb vaj tse.Yog tias cov cua sov tsis zoo dissipated, lub peev xwm kub ntawm LED nti yuav tsawg heev, yog li yog tias qee qhov cua sov tau sau tseg, qhov sib txuas kub ntawm cov nti yuav nce sai, thiab yog tias nws ua haujlwm ntawm qhov kub thiab txias rau lub sijhawm ntev, lifespan yuav luv luv.
Feem ntau hais lus, radiators tuaj yeem muab faib ua active txias thiab passive txias raws li txoj kev uas tshav kub raug tshem tawm ntawm lub radiator.Passive tshav kub dissipation yog ib txwm dissipate lub tshav kub ntawm lub tshav kub qhov chaw LED teeb qhov chaw mus rau hauv cov huab cua los ntawm lub tshav kub dab dej, thiab cov nyhuv tshav kub dissipation yog proportional rau qhov loj ntawm lub dab dej kub.Kev ua kom txias yog yuam kom tshem tawm cov cua sov tawm los ntawm lub dab dej kub los ntawm lub tshuab cua txias xws li kiv cua.Nws yog tus cwj pwm los ntawm kev ua haujlwm siab kub dissipation thiab me me ntawm lub cuab yeej.Kev ua kom txias tuaj yeem muab faib ua cua txias, kua txias, cua sov yeeb nkab txias, semiconductor txias, tshuaj txias thiab lwm yam.
Feem ntau, cov tshuab cua txias zoo tib yam yuav tsum xaiv cov hlau ua cov khoom ntawm lub tshuab hluav taws xob.Yog li ntawd, nyob rau hauv keeb kwm ntawm kev loj hlob ntawm radiators, cov ntaub ntawv hauv qab no kuj tau tshwm sim: ntshiab txhuas radiators, ntshiab tooj liab radiators, thiab tooj liab-aluminium ua ke technology.
Tag nrho cov luminous efficiency ntawm LED yog tsawg, yog li qhov sib koom ua ke kub siab, ua rau lub neej luv.Txhawm rau kom lub neej ntev thiab txo qhov kub ntawm qhov sib koom ua ke, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau qhov teeb meem ntawm cov cua sov dissipation.