PN hlws ris ntawm LED yog tsuas yog coj mus rau lub nti los ntawm cov khoom siv semiconductor nws tus kheej, uas muaj kev tiv thaiv tsis tau thermal. Los ntawm qhov kev xav ntawm LED Cheebtsam, nyob ntawm seb cov qauv ntim, kuj tseem yuav muaj qhov thermal tsis kam ntawm ntau qhov sib txawv ntawm cov nti thiab lub bracket. Qhov sib npaug ntawm ob qhov thermal resistances yog qhov thermal resistance Rj-a ntawm LED. Los ntawm tus neeg siv qhov kev xav, Rj-ib qho parameter ntawm ib qho LED tsis tuaj yeem hloov pauv. Qhov no yog ib qho kev kawm uas LED ntim cov lag luam yuav tsum tau kawm. Txawm li cas los xij, tus nqi Rj-ib qho tuaj yeem txo qis los ntawm kev xaiv cov khoom lossis cov qauv los ntawm cov tuam txhab sib txawv.
Ntawm cov teeb ci LED, txoj kev hloov hluav taws xob ntawm LED yog qhov nyuaj heev, thiab thawj txoj hauv kev yog LED PCB heatsink kua. Raws li tus tsim qauv ntawm cov teeb, nws yog lub hom phiaj los txhim kho cov khoom siv thiab cov qauv cua sov ntawm cov teeb thiab txo cov thermal tsis kam ntawm LED Cheebtsam thiab kua dej ntau npaum li sai tau.
Raws li tus neeg nqa khoom rau kev teeb tsa cov khoom siv hluav taws xob, LED cov khoom tseem txuas nrog lub rooj tsav xwm hauv Circuit Court feem ntau yog vuam. Tag nrho cov thermal kuj ntawm cov hlau raws li Circuit Court board yog me me. Copper substrate thiab aluminium substrate feem ntau siv. Aluminium substrate yog dav siv hauv kev lag luam vim nws tus nqi qis. Lub thermal kuj ntawm aluminium substrate yog txawv vim txawv manufacturers cov txheej txheem. Qhov kwv yees thermal kuj yog {{0}}.6-4.0 degree C/W, thiab tus nqi sib txawv kuj loj. Aluminium substrate feem ntau muaj 3 txheej ntawm lub cev, suav nrog txheej txheej hauv Circuit Court, txheej rwb thaiv tsev thiab txheej txheej substrate. Lub thermal conductivity ntawm cov khoom siv hluav taws xob hluav taws xob feem ntau kuj tsis zoo, yog li cov thermal kuj feem ntau yog los ntawm txheej rwb thaiv tsev, thiab cov ntaub ntawv rwb thaiv tsev siv sib txawv. Nyob rau hauv cov ntaub ntawv no, lub thermal kuj ntawm ceramic raws li insulating nruab nrab yog me me. Qhov pheej yig aluminium substrate feem ntau txais cov iav fiber ntau rwb thaiv tsev txheej los yog txheej rwb thaiv tsev. Lub thermal kuj tseem muaj feem xyuam rau lub thickness ntawm insulating txheej.
Ntawm qhov chaw ntawm kev sib koom ua ke ntawm cov nqi thiab kev ua haujlwm, hom thiab cheeb tsam ntawm aluminium substrate yuav tsum raug xaiv kom tsim nyog. Nyob rau hauv sib piv, qhov tseeb tsim ntawm radiator zoo thiab kev sib txuas zoo ntawm radiator thiab txhuas substrate yog cov ntsiab lus tseem ceeb rau kev vam meej ntawm lub teeb tsim. Cov yam ntxwv uas txiav txim siab lub peev xwm ntawm lub tshav kub dissipation yog thaj tsam ntawm qhov chaw sib cuag ntawm lub radiator thiab cov kua dej thiab cov dej ntws ntawm cov kua. General LED teeb yog passive tshav kub dissipation los ntawm ntuj convection, thiab thermal tawg kuj yog ib qho ntawm thawj cov cua kub dissipation txoj kev.
Yog li ntawd, peb tuaj yeem piav qhia vim li cas rau qhov tsis ua tiav ntawmLED phab ntsa ntxhua khaub ncaws:
1. Lub thermal tsis kam ntawm LED lub teeb qhov chaw yog qhov loj, thiab lub tshav kub tsis tuaj yeem dissipated los ntawm lub teeb ci. Kev siv cov thermal conductive muab tshuaj txhuam yuav ua rau tsis ua hauj lwm ntawm cov cua sov dissipation. Phab ntsa ntxhua khaub ncaws teeb pom kev zoo khoom
2. Aluminium substrate yog siv los ua lub teeb ci uas nyob ib sab ntawm PCB. Vim tias aluminium substrate muaj ntau yam thermal resistances, cov cua sov los ntawm lub teeb ci tsis tuaj yeem kis tau, thiab kev siv cov thermal conductive paste yuav ua rau tsis ua haujlwm ntawm cov cua sov dissipation.
3. Tsis muaj qhov tsim nyog rau thermal buffering ntawm lub teeb-emitting nto, uas yuav ua rau kub dissipation tsis ua hauj lwm ntawm LED teeb qhov chaw thiab lub teeb tsis ua hauj lwm ntxov. Peb qhov laj thawj saum toj no yog cov laj thawj tseem ceeb rau kev ua kom sov dissipation tsis ua haujlwm ntawm LED teeb pom kev lag luam hauv kev lag luam, thiab tsis muaj kev daws teeb meem. Qee lub tuam txhab siv ceramic substrate rau cov cua sov dissipation hauv kev ntim khoom ntawm cov hlaws dai, tab sis lawv tsis tuaj yeem siv dav vim tias muaj nqi siab.
Yog li ntawd, qee qhov kev txhim kho tau npaj tseg:
Txheej txheem cej luam ntawmLED phab ntsa ntxhua khaub ncawsradiator Roughening yog ib txoj hauv kev los txhim kho cov cua sov
Roughening tsis yog siv cov nplaum nplaum, tab sis tuaj yeem ua tiav los ntawm lub cev thiab tshuaj, feem ntau yog sandblasting thiab oxidation. Xim kuj yog ib txoj kev tshuaj, uas tuaj yeem ua tiav ua ke nrog oxidation. Thaum tsim cov profile abrasives, koj tuaj yeem ntxiv qee cov channel thiab ntxiv cov khoom profile los txhim kho cov cua sov dissipation peev ntawm LED teeb.