Thermal Management Considerations rau 36WIntegrated T8 Teeb nyob rau hauv kaw Enclosures
Hauv kev tsim ntawm LED teeb pom kev zoo, kev tswj xyuas thermal yog qhov tseem ceeb ncaj qha cuam tshuam rau kev ua tau zoo, kev ntseeg tau, thiab kev ua neej nyob. Cov lus nug tseem ceeb tshwm sim hais txog 36W kev sib xyaw T8 teeb ua haujlwm hauv cov hlua khi: nrog qhov kub thiab txias txog 90℃ntawm qhov ntsuas kub ntawm 40 degree, puas yog kev cia siab rau aluminium-magnesium alloy tube phab ntsa rau cua sov dissipation tsim nyog? Tsis tas li ntawd, cov khoom siv hluav taws xob puas tuaj yeem ua tiav cov thermal kuj tsawg dua lossis sib npaug li 10℃/ W hauv qhov chaw Ø26mm? Kab lus no tshawb txog cov kev sib tw thermal thiab cov kev daws teeb meem
Cov ntaub thaiv npog tsim ib puag ncig kev kub ntxhov rau LED teeb pom kev zoo. Tsis zoo li qhib cov qauv tsim uas tso cai rau ntuj convection thiab radiant tshav kub hloov mus rau cov huab cua nyob ib puag ncig, kaw cov hlua khi hluav taws xob uas tsim los ntawm lub teeb, ua rau kub kub nce. Rau 36W integrated T8 teeb, lub tshav kub flux ceev- txhais raws li lub hwj chim tso zis rau ib cheeb tsam ntawm chav tsev - tsim ib qho tseem ceeb thermal stress. Ntawm 40℃ambient kub, 90℃qhov kub ntawm qhov chaw qhia qhov kub ntawm qhov sib txawv ntawm 50 degree, qhia txog qhov yuav tsum tau ua kom muaj kev kub ntxhov kom tsis txhob muaj qhov kub thiab txias ntau dhau hauv LED chips thiab cov khoom tsav tsheb.
Aluminium-magnesium alloy tube phab ntsa ua lub luag haujlwm tseem ceeb hauv kev tswj xyuas thermal nyob rau hauv cov xwm txheej zoo li no. Cov alloys muaj qhov tshwj xeeb thermal conductivity, feem ntau yog li ntawm 100 txog 200 W / (m·K), deb tshaj qhov kev ua tau zoo ntawm cov yas lossis iav lwm txoj haujlwm. Qhov siab conductivity no ua rau muaj kev hloov pauv ntawm cov cua sov los ntawm lub teeb lub hauv paus rau sab nraud ntawm lub raj. Nyob rau hauv ib puag ncig kaw qhov twg huab cua ncig yog txwv, lub alloy qhov loj ntawm thaj chaw ua haujlwm ua lub hauv paus cua sov, ua kom yooj yim rau cua sov dissipation los ntawm hluav taws xob thiab conduction mus rau lub bracket qauv. Yog tias tsis muaj qhov kub ntawm cov hlau no- cov qauv dissipating, cov cua sov yuav sib sau ceev ceev hauv lub kaw lus kaw, thawb cov khoom siv kub dhau qhov kev txwv tsis pub khiav hauj lwm thiab ua rau tsis ua hauj lwm ntxov ntxov los yog cov teeb pom kev zoo degradation.
Cov qauv tsim ntawm aluminium-magnesium alloy tubes ntxiv dag zog rau lawv cov thermal ua haujlwm. Lawv cov duab cylindrical muab cov cua kub sib txawv nyob ib puag ncig ntawm lub teeb ci, tiv thaiv cov hotspots uas tuaj yeem cuam tshuam kev ncaj ncees. Cov khoom siv kho tshuab kuj tso cai rau nyias -walled kev tsim kho, ua kom muaj qhov chaw sab hauv rau LED modules thaum tswj kom muaj zog txaus thiab thermal conduction txoj hauv kev. Hauv cov ntsiab lus, cov phab ntsa alloy tube ua haujlwm raws li ob qho tib si tiv thaiv thiab ib qho tseem ceeb thermal choj ntawm lub teeb qhov chaw kub thiab qhov chaw sab nraud.
Tig mus rau tus tsav tsheb module kev ua tau zoo, ceramic substrate technology nthuav tawm cov kev daws teeb meem rau kev ua tiav cov thermal tsis tshua muaj nyob hauv qhov chaw kaw. Cov ntaub ntawv ceramic xws lialuminium oxide (Al₂O₃) thiab txhuas nitride (AlN) muab cov thermal conductivity zoo dua piv rau cov tsoos FR4 Circuit Court boards.AlN ceramics, tshwj xeeb tshaj yog, muab cov thermal conductivity txog 200 W / (m·K), txo qis kev hloov hluav taws xob los ntawm cov khoom siv hluav taws xob mus rau lub substrate. Cov yam ntxwv no yog qhov tseem ceeb rau cov tsav tsheb modules ua haujlwm nyob rau hauv Ø26mm spatial txwv ntawm T8 teeb tsim.
Kev ua tiav cov thermal tsis kam ntawm Tsawg dua los yog sib npaug li 10℃/ W hauv qhov chaw compact yog nyob ntawm ntau yam tsim. Ceramic substrate lub thickness ncaj qha cuam tshuam rau thermal kev ua tau zoo-thinner substrates txo cov conduction kuj tab sis yuav tsum muaj kev ruaj ntseg zoo. Siv tau zoo thermal vias thiab tooj liab kab tsim ntawm cov ceramic substrate tsim tsawg- txoj kev tiv thaiv kom sov los ntawm tshav kub- tsim cov khoom xws li MOSFETs thiab capacitors rau lub substrate nto. Tsis tas li ntawd, kev sib raug zoo ntawm cov ceramic substrate thiab aluminium -magnesium alloy tube phab ntsa, feem ntau yooj yim los ntawm thermal interface cov ntaub ntawv (TIMs) nrog cov thermal conductivity, txo qhov kev tiv thaiv nyob rau hauv tshav kub hloov saw.
Cov ntaub ntawv simulation txhawb nqa qhov ua tau ntawm txoj hauv kev no. Thermal modeling ntawm ceramic substrate tsav modules nyob rau hauv Ø26mm qhov chaw qhia tau hais tias nrog optimized tivthaiv kev tso kawm, siab -conductivity ceramic cov ntaub ntawv, thiab tsim interface tsim, thermal kuj muaj nuj nqis tsawg li 6-8℃/ W tuaj yeem ua tiav. Cov txiaj ntsig no ua raws li qhov xav tauTsawg dua lossis sib npaug li 10℃/ Wspecification, qhia tau hais tias ceramic substrates tau zoo tswj cov cua sov hauv constrained T8 teeb ib puag ncig thaum ua ke nrog cov tswv yim tsim nyog.
Kev sib koom ua ke ntawm aluminium-magnesium alloy tube phab ntsa thiab ceramic substrate tsav tsheb modules tsim ib qho kev tswj xyuas thermal. Ceramic substrate tau txais txiaj ntsig zoo sau thiab hloov cov cua sov los ntawm cov khoom siv hluav taws xob, thaum lub phab ntsa alloy tube dissipates cov cua sov no mus rau ib puag ncig sab nraud. Qhov kev sib koom ua ke no hais txog ob qho kev tsim hluav taws xob hauv cheeb tsam hauv tus neeg tsav tsheb thiab lub cev- qib cua sov hauv qhov chaw kaw.
Hauv kev xaus, kev cia siab rau aluminium-magnesium alloy tube phab ntsa rau cua sov dissipation nyob rau hauv 36W integrated T8 teeb ua hauj lwm nyob rau hauv kaw brackets ntawm 40℃ambient kub tsis yog tsuas yog pab tau tab sis tsim nyog los tiv thaiv thermal tsis ua hauj lwm. Ib txhij, ceramic substrate tsav tsheb modules tuaj yeem ua tiav qhov yuav tsum tau ua kom muaj cua sov tsawg dua lossis sib npaug li 10℃/ W hauv qhov chaw Ø26mm thaum ua kom zoo dua los ntawm kev xaiv cov khoom, kev tsim qauv, thiab thermal interface engineering. Ua ke, cov thev naus laus zis no tsim cov kev tswj xyuas thermal uas muaj peev xwm ua kom muaj kev ruaj ntseg txawm tias nyob rau hauv cov xwm txheej nyuaj ntawm cov ntaub thaiv npog.
