Emergency Light BulbKev ua tau zoo nyob rau hauv qhov kub siab heev: Pib lub sij hawm thiab xim kub ruaj khov
Nyob rau hauv ib puag ncig tseem ceeb xws li los ntawm cov chaw tshawb fawb polar mus rau suab puam chaw ua haujlwm, qhov muag teeb thaum muaj xwm ceev yuav tsum xa cov kev ua tau zoo nyob rau hauv qhov kub thiab txias. Ob qhov kev ntsuas kev ua tau zoo tseem ceeb muaj kev sib tham txog kev sib tham: cov teeb pom kev kub ntxhov tuaj yeem ua tiav lub sijhawm pib hauv qab 3 vib nas this ntawm -30 degree, thiab lawv cov xim kub sib txawv tuaj yeem tswj tau li ntawm ± 100K ntawm qhov ci ci hauv qab 50 degree? Niaj hnub nimno teeb pom kev lag luam thev naus laus zis tau ua qhov tseem ceeb hauv kev daws cov teeb meem no, txawm hais tias cov kev daws teeb meem yuav tsum tau tsom mus rau engineering thoob plaws ntau yam.
Ua tiav lub sijhawm pib ua haujlwm qis dua 3 vib nas this ntawm -30℃xav tau cov kev tshwj xeeb los kov yeej cov kev txwv thermal ntawm ob lub zog thiab lub teeb -emitting Cheebtsam. Ib txwm alkaline roj teeb raug kev txom nyem loj heev poob nyob rau hauv sub-zero kub, feem ntau tsis xa txaus tam sim no rau illumination tam sim ntawd. Hloov chaw,lithium thionyl chloride roj teebtau tshwm sim raws li tus qauv kub rau qis- qhov kub thiab txias teeb pom kev zoo, tswj kwv yees li 80% ntawm lawv lub peev xwm nominal ntawm -30℃vim lawv tsis muaj zog sab hauv thiab ruaj khov electrochemical zog. Txhawm rau txhawm rau txhawm rau pib ua haujlwm ntxiv, cov tuam txhab koom ua ke capacitor-based preheating circuits uas khaws cov nqi txaus los pib lub teeb pom kev tam sim, txawm tias lub roj teeb tseem ceeb sov rau kev ua haujlwm kub.
Rau lub teeb -emitting element, LEDs tau tshaj qhov muag teev nyob rau hauv txias- huab cua kev ua tau zoo. Gallium nitride (GaN)-raws li LEDs, tshwj xeeb tshaj yog, nthuav tawm cov thermal lag tsawg tsawg, ncav cuag 90% ntawm qhov ci ci tag nrho hauv 500ms tsis hais qhov kub thiab txias. Engineers txhim kho qhov muaj peev xwm los ntawmqis-kub doping profiles nyob rau hauv LED chips, txo cov electron- qhov recombination qeeb tshwm sim los ntawm txias -induced lattice contractions. Advanced fixtures kuj suav nrog thermally conductive pathways siv tooj liab -core Circuit Court boards, kom ntseeg tau sai sai hloov tshav kub los ntawm lub roj teeb mus rau cov khoom tseem ceeb, ntxiv txo qhov pib qeeb. Tiag -kev sim ntiaj teb no lees paub tias cov teeb pom kev zoo thaum muaj xwm ceev LEDs tsis tu ncua ua tiav 1.5–2.8 thib ob lub sijhawm pib ntawm -30℃.
Kev tswj cov xim kub sib txawv nyob rau hauv ± 100K ntawm 50℃tag nrho ci ntsa iab nthuav qhia cov teeb meem sib txawv, feem ntau tshwm sim los ntawm cov teebmeem thermal ntawm LED phosphors thiab cov khoom siv semiconductor. Cov xim kub ruaj khov nyob ntawm kev tswj xyuas qhov sib txawv ntawm cov emission wavelengths los ntawm ob qho tib si LED nti thiab nws cov phosphor txheej. Ntawm qhov kub siab, xiav LED chips (feem ntau 450–460nm) muaj kev hloov pauv me ntsis (~ 1–2nm ib 10 degree), thaum phosphors-tshwj xeeb tshaj yog cerium-doped yttrium aluminium garnet (YAG:Ce) {{11} kev hloov dua siab tshiab.
Yuav kom txo tau cov teebmeem no, manufacturers ntiavthermally ruaj khov phosphor formulationssuav nrog tsawg-lub ntiaj teb dopants zoo li lutetium los yog gadolinium, uas txo cov thermal quenching ntawm qhov kub thiab txias. Cov phosphors siab heev no tswj lawv cov emission spectra (feem ntau 550-570nm rau sov dawb) nrog tsawg dua 5nm hloov ntawm 50 degree. Qhov tseem ceeb sib npaug yog kev tswj xyuas thermal: ceramic substrates nrog cov thermal conductivity siab (Ntau dua lossis sib npaug ntawm 200 W / m·K) dissipate cua sov los ntawm LED hlws ris, ua kom kub ua hauj lwm nyob rau hauv 60-70℃txawm nyob rau tag nrho brightness nyob rau hauv 50℃ambient tej yam kev mob.
Hluav taws xob tswj tshuab ntxiv txhim khu kev ruaj ntseg. Tsis tu ncua-tam sim no cov tsav tsheb LED nrog qhov kub thiab txias- cov lus tawm tswv yim them rov qab kho tam sim no meej kom tiv thaiv kev hloov pauv thermal, tiv thaiv overcurrent tej yam kev mob uas exacerbate xim hloov. Qee qhov khoom siv hwm zoo sib xyaw ua ke cov lus tawm tswv yim spectrometric, tsis tu ncua kev soj ntsuam cov zis thiab 微调驱动 tsis ua kom lub hom phiaj xim kub. Ua ke, cov thev naus laus zis no ua rau cov xim kub sib txawv ntawm 60-90K ntawm 50℃tag nrho ci ntsa iab hauv qhov chaw sim nruj.
Hauv kev xaus, niaj hnub teeb pom kev kub ntxhov tuaj yeem ua tau raws li ob qho kev ua tau zoo los ntawm kev ua haujlwm tshwj xeeb. Lub sij hawm pib hauv qab 3 vib nas this ntawm -30℃yog ua tiav nrog lithium roj teeb, capacitor preheating, thiab GaN -raws li LEDs. Xim kub stability nyob rau hauv ± 100K ntawm 50℃tag nrho brightness yog pom tau los ntawm thermally ruaj khov phosphors, siab txias tshuab, thiab precision hluav taws xob tswj. Rau cov neeg siv ua haujlwm nyob rau hauv qhov chaw huab cua, xaiv cov khoom siv tau raug lees paub los ntawm kev ntsuam xyuas thib peb ntawm qhov kub thiab txias tseem tseem ceeb heev. Raws li cov ntaub ntawv tshawb fawb thiab thermal engineering kev vam meej, txawm tias kev ua haujlwm nruj dua yuav ua tau tus qauv, kom ntseeg tau tias muaj teeb pom kev kub ntxhov thoob plaws qhov xwm txheej hnyav.
