Lub hauv paus paub txog LED: Tshawb nrhiav qhov ua rau LED teeb lwj
Raws li hom tshiab teeb pom kev zoo, LED teeb yog txuag hluav taws xob, ib puag ncig tus phooj ywg, thiab muaj lub neej ntev, thiab tau nrhiav los ntawm peb cov neeg siv khoom. Txawm li cas los xij, qhov teeb meem ntawm LED teeb lwj yog lwm qhov teeb meem uas LED teeb yuav tsum tau ntsib. Cov teeb pom kev tsis sib haum xeeb tau cuam tshuam rau kev siv cov teeb ci LED.
Txog tam sim no, lub teeb lwj ntawm cov LEDs dawb ntawm lub khw yuav yog ib qho teeb meem tseem ceeb rau pej xeem teeb pom kev zoo. Dab tsi ua rau lub teeb lwj ntawm LEDs? Feem ntau hais lus, muaj ob yam tseem ceeb rau lub teeb lwj ntawm LEDs:
Ua ntej, qhov zoo ntawm LED khoom lawv tus kheej:
1. Cov chips LED siv yog lub cev tsis zoo, thiab qhov ci ntsa iab sai sai.
2. Muaj qhov tsis xws luag hauv cov txheej txheem tsim khoom, thiab cov cua kub dissipation ntawm LED nti tsis tuaj yeem raug xa tawm los ntawm tus PIN tus pin zoo, ua rau lub siab kub ntawm LED nti thiab aggravated nti attenuation.
Thib ob, kev siv cov xwm txheej:
1. Lub LED yog tsav los ntawm qhov tam sim no tsis tu ncua, thiab qee qhov LEDs tau tsav los ntawm qhov hluav taws xob ua kom lub LED attenuate.
2. Lub zog tsav tam sim no ntau dua li qhov ntsuas tsav.
Qhov tseeb, muaj ntau yam laj thawj rau lub teeb lwj ntawm LED cov khoom. Qhov tseem ceeb tshaj plaws yog qhov teeb meem kub. Txawm hais tias muaj ntau lub tuam txhab tsis them nyiaj tshwj xeeb rau qhov teeb meem kub dissipation nyob rau hauv cov khoom thib ob, lub teeb lwj ntawm cov khoom siv LED theem ob yuav siab dua qhov ntawd yog tias lawv them sai sai rau cov cua sov dissipation mus ntev. LED khoom yog siab dua. Lub thermal tsis kam ntawm LED nti nws tus kheej, kev cuam tshuam ntawm cov kua nplaum nyiaj, cov nyhuv tshav kub ntawm lub substrate, thiab cov xov hlau colloid thiab kub kuj muaj feem xyuam rau lub teeb lwj.
Peb yam uas cuam tshuam rau qhov zoo thiab lub teeb lwj ntawm LED teeb
Ua ntej, yam LED dawb lub teeb xaiv.
Qhov no yog qhov tseem ceeb heev, thiab qhov zoo ntawm LED lub teeb dawb tuaj yeem hais tias yog qhov tseem ceeb heev. Piv txwv li, tib lub teeb dawb LED, sawv cev los ntawm 14mil dawb lub teeb ntu nti ntawm Epistar, yog encapsulated nrog epoxy resin primer zoo tib yam, dawb lub teeb kua nplaum thiab ntim kua nplaum. Tom qab 1, 000 teev, cov ntaub ntawv attenuation yog 70 feem pua lub teeb lwj; yog tias nws tau ntim nrog Class D cov kua nplaum uas tsis muaj roj, nyob rau hauv tib qhov chaw laus, lub teeb lwj ib 1,000 teev yog 45 feem pua ; Yog tias nws tau ntim nrog Class C cov kua nplaum uas tsis muaj roj, nyob rau hauv tib qhov kev laus ib puag ncig, lub teeb lwj ib txhiab teev yog 12 feem pua; Yog hais tias B-hom kua nplaum uas tsis muaj roj yog encapsulated, nyob rau hauv tib lub aging ib puag ncig, lub txhiab-teev lub teeb lwj yog -3 feem pua ; Yog hais tias A-chav uas tsis muaj roj nplaum nplaum nyob rau hauv tib qhov chaw laus, lub txhiab-teev lub teeb lwj Qhov poob yog -6 feem pua.
Qhov thib ob, qhov chaw ua haujlwm kub ntawm LED teeb hlaws.
Raws li cov ntaub ntawv kev laus ntawm ib lub teeb dawb LED, yog tias tsuas yog ib qho LED dawb lub teeb ua haujlwm, thiab qhov kub thiab txias yog 30 degrees, ces qhov ntsuas kub ntawm ib lub teeb dawb LED yuav tsis ua haujlwm. tshaj 45 degrees. Lub sijhawm no, lub neej ntawm LED no yuav zoo tagnrho.
Yog tias muaj 100 LED lub teeb dawb ua haujlwm tib lub sijhawm, thiab lub sijhawm nruab nrab ntawm lawv tsuas yog 11.4 hli, ces qhov ntsuas kub ntawm LED lub teeb dawb nyob ib ncig ntawm pawg yuav tsis tshaj 45 degrees, tab sis qhov kub thiab txias ntawm LED teeb lub teeb nyob hauv. qhov nruab nrab ntawm pawg yuav tsis tshaj 45 degrees. Cov LED dawb lub teeb muaj peev xwm ncav cuag qhov kub ntawm 65 degrees. Lub sijhawm no, LED teeb hlaws yog qhov kev sim. Tom qab ntawd, cov teeb ci LED dawb sib sau ua ke nyob rau hauv nruab nrab yuav theoretically muaj lub teeb nrawm dua, thaum lub teeb LED dawb nyob ib ncig ntawm lub teeb teeb yuav muaj lub teeb qeeb qeeb.
Txawm li cas los xij, txhua tus yuav tsum paub tias LEDs ntshai tshav kub. Qhov kub thiab txias, qhov luv ntawm LED lifespan, thiab qhov kub thiab txias, qhov ntev ntawm LED lifespan. Qhov zoo tshaj plaws ua haujlwm kub ntawm LEDs yog qhov tseeb ntawm qhov rho tawm 5 thiab xoom degrees. Tab sis qhov no yeej tsis yooj yim sua.
Yog li ntawd, tom qab peb nkag siab txog qhov zoo tshaj plaws ua haujlwm tsis zoo ntawm LED teeb hlaws, peb sim peb qhov zoo tshaj plaws los ntxiv dag zog rau kev ua haujlwm ntawm cov cua sov thiab cov cua kub dissipation thaum tsim teeb thiab teeb. Txawm li cas los xij, qhov ntsuas kub qis dua, LED lub neej ntev dua.
Ntxiv dua thiab, qhov ua haujlwm hluav taws xob tsis zoo ntawm LED teeb hlaws yog tsim.
Raws li cov txiaj ntsig kev sim, qhov txo qis ntawm kev tsav tsheb tam sim no ntawm LED dawb lub teeb, qhov me dua cov cua sov tawm, thiab tau kawg, qhov me dua qhov ci. Raws li kev sojntsuam, hauv kev tsim ntawm LED hnub ci teeb pom kev zoo Circuit Court, kev tsav tsheb tam sim no ntawm LED feem ntau tsuas yog 5-10mA; rau cov khoom lag luam uas muaj ntau lub teeb hlaws, xws li ntau tshaj 500 lossis ntau dua, kev tsav tsheb tam sim no feem ntau tsuas yog 10-15mA , Thiab cov tsav tsheb tam sim no ntawm cov npe nrov LED daim ntawv thov teeb pom kev zoo tsuas yog 15-18mA , thiab ob peb tus neeg tsim cov tam sim no ntau tshaj 20mA.
Cov txiaj ntsig kev sim kuj tseem qhia tau tias nyob rau hauv kev tsav tsheb tam sim no ntawm 14mA, thiab lub hau npog tsis yog qhov cua, huab cua kub hauv qhov nce mus txog 71 degrees, thiab lub teeb tawg ntawm cov khoom siv qis qis yog xoom rau 1,000 teev thiab 3. feem pua rau 2, 000 teev. , uas txhais tau hais tias qhov qis qis LED dawb lub teeb tau mus txog nws qhov siab tshaj plaws hauv ib puag ncig, thiab txawm tias nws loj npaum li cas, nws yog hom kev puas tsuaj rau nws.
Vim tias lub rooj tsav xwm laus siv rau kev laus tsis muaj qhov ua kom sov, cov cua sov tsim tawm thaum lub LED ua haujlwm tsis tuaj yeem ua rau sab nraud. Qhov no yog ua pov thawj sim. Cov huab cua kub hauv lub rooj tsavxwm laus tau mus txog qhov kub ntawm 101 degrees, thiab qhov kub ntawm lub hau npog ntawm lub rooj tsav tsheb laus tsuas yog 53 degrees, qhov sib txawv ntawm kaum ob degrees. Qhov no qhia tau hais tias lub hau yas tsim los yeej tsis muaj kev ua haujlwm ntawm cov cua sov thiab cov cua kub dissipation. Txawm li cas los xij, hauv kev tsim cov teeb pom kev dav dav thiab cov teeb ci, kev ua haujlwm ntawm kev siv hluav taws xob thiab cov cua sov dissipation yog suav tias yog. Yog li ntawd, txhawm rau ua kom tiav, kev tsim cov khoom siv hluav taws xob ua haujlwm ntawm LED teeb hlaws yuav tsum ua raws li qhov xwm txheej tiag tiag. Yog hais tias lub tshav kub conduction thiab tshav kub dissipation muaj nuj nqi ntawm lub teeb yog zoo, nws tsis muaj teeb meem yog hais tias tus tsav tam sim no ntawm lub LED dawb lub teeb yog nce me ntsis, vim hais tias cov LED teeb hlaws ua hauj lwm. Cov cua sov tuaj yeem raug xa tawm mus rau sab nraud hauv ib qho tam sim, thiab tsis muaj kev puas tsuaj rau LED, uas yog kev saib xyuas zoo tshaj plaws rau LED. Ntawm qhov tsis sib xws, yog tias qhov kub thiab txias dissipation muaj nuj nqi ntawm lub teeb yog li ntawd, nws yog qhov zoo dua los tsim lub voj voog me me kom nws tso tawm tsawg dua.
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