Kev tsom xam ntawm txoj kev txias ntawm LED teeb
Oct 02, 2021
Muaj peb txoj hauv kev rau cov teeb ci LED kom dissipate tshav kub: conduction, convection thiab hluav taws xob, thiab cov txheej txheem cua sov ua lub luag haujlwm tseem ceeb tshaj plaws. Yuav kom ua tiav cov thermal conductivity zoo, cov ntaub ntawv thermal conductive yuav tsum tau siv kom tsim nyog, thiab cov cua kub dissipation thiab hluav taws xob yuav tsum tau ua kom tiav.
1)Thaum tshav kub kub conduction.
Qhov teeb meem nws tus kheej, los yog thaum qhov teeb meem los mus rau hauv kev sib cuag nrog lwm yam teeb meem, kev hloov ntawm lub zog yog hu ua cua sov conduction, uas yog feem ntau txoj kev ntawm tshav kub hloov lwm lub tsev.
Lub tshav kub qhov chaw yog qhov tseem ceeb rau cov cua sov conduction. Lub tshav kub ntawm LED teeb pom kev zoo yog los ntawm ob ntu: lub teeb ci thiab lub zog hluav taws xob. Rau qhov cua sov ntawm lub teeb qhov chaw, nws yog feem ntau yuav tsum tau them sai sai rau qhov zoo ntawm qhov chaw sib cuag ntawm PCB ntawm lub teeb ci PCB thiab qhov sib txuas ntawm lub dab dej kub. Qhov loj dua qhov chaw sib cuag tau zoo, qhov zoo dua qhov cua sov dissipation. Tsis tas li ntawd, yuav tsum tau them sai sai rau lub tshav kub conduction interface ntawm cov khoom sib txawv, ua kom nws du li sai tau, kev sib txuas ntawm cov hluav taws xob hluav taws xob yuav tsum nyob ze txaus, thiab qhov sib txuas ntawm qhov sib txuas ntawm qhov sib txuas yuav tsum yog me me thiab tsawg npaum li. ua tau.
Nyob rau hauv lub tshav kub conduction tsim ntawm LED teeb, ib tug zoo tshav kub conduction txoj kev yuav tsum tau txo cov thermal tsis kam ntawm PCB, tshav kub conduction nruab nrab thiab radiator, ua rau kom cov kev sib cuag nto ntawm peb, thiab xaiv tshav kub conduction nruab nrab nrog ntau dua thermal conductivity.
2)Convection
Convection yog hais txog cov txheej txheem hloov hluav taws xob uas cov kua (gas lossis kua) sib cuag nrog cov khoom nto ua rau cov kua dej ua kom cov cua sov tawm ntawm qhov chaw. Muaj ob qhov sib txawv ntawm thermal convection, uas yog ntuj convection thiab yuam convection. Natural convection yog hais txog cov dej txav, uas yog tshwm sim los ntawm qhov kub thiab txias. Cov kua dej uas muaj qhov kub siab dua muaj qhov ntom ntom, yog li lawv lub teeb hauv qhov hnyav thiab txav mus rau qhov siab. Forced convection txhais tau hais tias cov kua yog tsav los ntawm sab nraud quab yuam (xws li cua ntws los ntawm tus kiv cua). Txhua qhov chaw tsav tsheb mus, cov kua dej txav mus rau qhov twg, yog li hom thermal convection no ua haujlwm zoo dua thiab muaj kev taw qhia.
Ntuj convection kuj yuav tsum muaj qhov chaw hloov hluav taws xob zoo, yog li feem ntau, roughening ntawm phab ntsa sab nrauv ntawm lub tshuab hluav taws xob tuaj yeem ua rau thaj chaw hloov pauv tau zoo; Tsis tas li ntawd, thaum txau cov xim sib txawv, yuav tsum xav txog qhov tuab ntawm cov tshuaj tsuag thiab lub peev xwm thermal conductivity. Feem ntau, txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau, peb siv cov fin qauv, qhov kev sib hloov pauv tau zoo yog li 50% -60%, thiab" fin-type" Lub dab dej kub tuaj yeem kho qhov kev sib hloov pauv tau zoo los ntawm kev hloov cov khoom siv hluav taws xob thiab qhov sib txawv ntawm qhov sib txawv.
Nyob rau hauv lub ntuj convection system, lub hwj chim mov ntawm feem ntau LED teeb xws li raj teeb, qhov muag teev thiab tsom teeb yog feem ntau muab tso rau hauv lub teeb kab noj hniav thiab lub hwj chim mov yuav kuj ua kom sov, nws yog pom zoo kom ua kom cov huab cua txheej ntawm lub hwj chim mov, LED lub teeb qhov chaw thiab lub tsev txhab nyiaj platform ntawm PCB los ua ib qho kev faib huab cua thiab tsis muaj zog ntawm thermal teb superimposition nyhuv.
3)Kub hluav taws xob
Thaum tshav kub kub hluav taws xob yog ib qho kev hloov pauv uas tso cai rau kev sib pauv cua sov kom tshwm sim yam tsis muaj qhov nruab nrab lossis tsis muaj kev sib cuag.
Tsis tas li ntawd, cov hluav taws xob thermal yog ib hom kev hloov hluav taws xob uas txhua yam khoom tau nqa tawm txhua lub sijhawm, thiab cov hluav taws xob siv hluav taws xob sib txawv ntawm cov khoom sib txawv. Feem ntau, qhov hluav taws xob siv hluav taws xob ntawm cov khoom xim txias yog qis dua li cov khoom sov-xim, thiab cov hluav taws xob siv hluav taws xob ntawm cov khoom ntxhib yog ntau dua li cov khoom du. Feem ntau, radiant tshav kub pauv ntawm qhov muag teev thiab tsom teeb me me thiab tuaj yeem kwv yees li tsis quav ntsej.
