Hauv LED zaub screen MTBF (Lub Sijhawm Nruab Nrab Nruab Nrab Tsis Ua Haujlwm) kev ntsuas kev ua neej, ntsuas kub thiab av noo ua ke kev sib tw caij tsheb kauj vab yog ib kauj ruam tseem ceeb hauv kev ntsuas nws qhov kev hloov pauv ib puag ncig thiab kev ntseeg tau. Nws feem ntau simulates alternating kub thiab av noo hloov nyob rau hauv tiag tiag cia thiab kev khiav hauj lwm scenarios kom ceev cov khoom aging thiab kwv yees lifespan. Cov kev ntsuam xyuas hauv qab no suav nrog cov qauv ntsuas, lub hom phiaj, txoj hauv kev, thiab kev cuam tshuam ntawm LED zaub:
I. Kev Ntsuas Cov Ntsiab Cai thiab Lub Hom Phiaj Kub thiab av noo ua ke kev sim kev caij tsheb kauj vab nthuav tawm lub vijtsam LED tso rau qhov kev sim ua ntej - teeb tsa ib puag ncig nrog kev hloov pauv kub thiab av noo, simulating scenarios xws li diurnal kub variations thiab ib puag ncig kev hloov thaum lub sij hawm kev thauj mus los uas cov khoom yuav ntsib nyob rau hauv tiag tiag siv. Nws lub hom phiaj tseem ceeb suav nrog:
Txheeb xyuas Environmental Adaptability: Tshawb xyuas cov khoom lag luam kev ruaj ntseg nyob rau hauv siab thiab qis kub thiab hloov cov av noo, thiab ntsuas nws lub peev xwm los tiv thaiv ib puag ncig kev hloov pauv.
Accelerating Aging thiab Predicting Lifespan: Los ntawm kev ua kom luv luv ntawm lub voj voog kev sim thiab siv qhov kub thiab txias thiab av noo los ua kom cov khoom aging, kwv yees cov khoom lag luam tsis ua hauj lwm thiab tus nqi MTBF thaum lub sij hawm ntev - siv.
Kev txheeb xyuas qhov ua tsis tau zoo: Kev txheeb xyuas qhov cuam tshuam ntawm qhov kub thiab av noo hloov ntawm cov ntaub ntawv, cov khoom siv hluav taws xob, thiab kev ua haujlwm tag nrho, muab lub hauv paus rau kev tsim kho kom zoo.
II. Kev sim thiab cov qauv
Kev Xeem Xeem:
Qhov kub thiab txias: Feem ntau npog cov khoom lag luam txwv, xws li -40℃txog 85 degree.
Humidity Range: Npog qhuav (piv txwv li, 10% RH) mus rau high humidity (piv txwv li, 95% RH) ib puag ncig.
Cycling Cycle: Teem raws li cov yam ntxwv ntawm cov khoom, xws li txhua hnub los yog teev kub thiab av noo alternation.
Cov txheej txheem xeem:
Kev Ntsuam Xyuas Thaum Ntxov: Sau qhov kev ua haujlwm thawj zaug ntawm lub vijtsam LED (xws li, ci ntsa iab, xim kub, kev ua haujlwm hluav taws xob) ua ntej kuaj.
Cyclic Exposure: Muab cov qauv tso rau hauv qhov chaw hloov pauv kub thiab av noo ib puag ncig rau tus naj npawb ntawm cov voj voog ua ntej (piv txwv li, 500 cycles).
Intermediate Testing: Saib xyuas qhov kev hloov pauv ntawm kev ua haujlwm ib ntus thaum lub caij caij tsheb kauj vab thiab sau cov degradation ntawm cov ntsuas tseem ceeb.
Kev ntsuam xyuas zaum kawg: Tom qab kev caij tsheb kauj vab ua tiav, ua qhov kev sim ntsuas, sib piv cov ntaub ntawv thawj zaug, thiab tshuaj xyuas seb qhov kev hloov pauv ntawm cov yam ntxwv ua haujlwm puas nyob hauv qhov kev txwv.
Cov qauv siv:
Txuj Ci thoob ntiaj teb: IEC 60068-}2-38 (Kev kuaj ib puag ncig - Ntu 2-38: Kev ntsuas kub thiab av noo sib xyaw ua ke)
National Standard: GB / T 2423.34 (sib npaug rau IEC tus qauv).
European Standard: EN 60068-2-38 (raws li IEC tus qauv).
III. Kev cuam tshuam ntawm LED Qhia Hloov qhov kub thiab av noo ib puag ncig tuaj yeem ua rau cov hom tsis ua haujlwm hauv qab no, cuam tshuam ncaj qha rau MTBF lifespan:
Cov khoom nthuav dav thiab poob ntawm lub cev muaj zog: Kev nqus dej noo thiab nthuav dav ntawm cov khoom siv encapsulation tuaj yeem ua rau cov nti LED cais tawm ntawm lub substrate, ua rau qhib qhov hluav taws xob tsis ua haujlwm.
Cov yas casings yuav tawg vim thermal expansion thiab contraction, txo cov qib kev tiv thaiv.
Kev hloov tshuaj lom neeg thiab kev xeb: Oxidation ntawm cov hlau lead hauv cov av noo ib puag ncig ua rau muaj zog tiv thaiv lossis qhib circuits.
Lubricant tsis ua haujlwm yuav ua rau cov khoom siv sib xyaw ua ke, cuam tshuam rau kev ua haujlwm ntawm cov cua sov dissipation system.
Electronic Component Degradation: Parameter drift nyob rau hauv tsav ICs vim qhov chaw ntub thiab kub ua rau cov zis tsis ruaj khov tam sim no, ua rau lub teeb ci nrawm nrawm.
Capacitor capacitance txo qis tom qab nqus dej noo, uas ua rau lub zog module tsis ua haujlwm.
Rwb thaiv tsev Performance Degradation: Moisture absorption los ntawm Circuit Court board rwb thaiv tsev txheej yuav txo qhov tawg voltage, ua rau muaj kev pheej hmoo ntawm luv circuits.
IV. Lub luag haujlwm ntawm Kev Ntsuas hauv MTBF Kev Ntsuas
Accelerated Life Testing (ALT):
Kev ntsuas lub neej nruab nrab ua rau lub sijhawm ntsuas luv luv los ntawm kev ntsuas kub thiab av noo, simulating ntev - siv cov teebmeem. Piv txwv li, 500 lub voj voog yuav sib npaug rau ntau xyoo ntawm kev siv tiag tiag.
Los ntawm kev sib txuas cov qauv Arrhenius lossis lub Coffin-Manson qauv, cov ntaub ntawv xeem tau ntxiv rau tus nqi MTBF raws li kev ua haujlwm ib txwm muaj.
Failure Data Analysis:
Lub sij hawm thiab hom kev ua tsis tiav thaum lub sij hawm xeem raug txheeb xyuas los xam qhov tsis ua hauj lwm tus nqi (λ).
MTBF=1/λ. Piv txwv li, yog tias qhov ua tsis tiav thaum lub sij hawm xeem yog 0.002 cycles / 1000 teev, ces MTBF yog 500,000 teev.
Tsim Kev Txhim Kho Hauv paus:
Kev ua kom zoo dua yog ua los ntawm qhov tsis muaj zog uas tshwm sim thaum kuaj (xws li cov txheej txheem sib khi thiab xaiv cov khoom siv) txhawm rau txhim kho kev ntseeg tau ntawm cov khoom.
V. Daim Ntawv Thov Scope thiab Kev Lag Luam Tseem Ceeb
Kev ntsuas ntsuas kub thiab av noo yog dav siv rau LED cov lus qhia thiab lawv cov khoom tseem ceeb (xws li lub voj voog tsav tsheb thiab lub zog hluav taws xob), tshwj xeeb tshaj yog rau cov khoom siv sab nraum zoov lossis siab - av noo ib puag ncig. Los ntawm qhov kev xeem no, manufacturers tuaj yeem:
Txheeb xyuas qhov ua tsis tau tiav thaum ntxov, txo qis tom qab - cov nqi muag khoom.
Ua tau raws li cov qauv kev lag luam (xws li IEC 62471 photobiological kev nyab xeeb tus qauv) thiab cov neeg siv khoom xav tau.
Txhim kho cov khoom lag luam kev sib tw thiab txuas ntxiv lub neej kev pabcuam.
Hauv cov ntsiab lus: Kev ntsuas kub thiab av noo ua ke kev sib tw caij tsheb kauj vab yog qhov tseem ceeb ntawm LED zaub MTBF kev sim neej. Los ntawm kev simulating ib puag ncig huab cua kom nrawm rau kev laus, nws raug ntsuas qhov kev ntseeg tau ntawm cov khoom. Kev sib xyaw cov qauv kev sim nrog cov kev soj ntsuam tsis ua haujlwm muab lub hauv paus kev tshawb fawb rau kev tsim kho kom zoo thiab kev kwv yees lub neej, thaum kawg kom ua tiav ntev - lub sijhawm ua haujlwm ruaj khov ntawm cov khoom hauv ib puag ncig nyuaj.
