Derating LEDs: Nkag siab Forward
Tam sim no vs. Ambient Kub
Daim duab 1 thiab daim duab 2 qhia ib qho piv txwv qhov twg tam sim no derated rau account rau kub. Cov ntaub ntawv kev lag luam ntawm Toshiba LED feem ntau qhia txog kev sib raug zoo ntawm tus nqi tam sim no thiab qhov kub thiab txias. Thov xa mus rau cov ntaub ntawv no thaum npaj kev tsim qauv tshiab.
Cov piv txwv hauv qab no piav qhia yuav ua li cas txo qhov kub ntawm lub sijhawm tsim:
Daim duab 1 - Qhia los ntawm kev tsim (22 mA) tshaj qhov tso cai ntawm qhov kub thiab txias
Daim duab 2 - Qhia los ntawm tus qauv tsim (22 mA) yog nyob rau hauv cov nqi tso cai ntawm qhov kub thiab txias
LED Teeb
Lub teeb LED yuav tsum tau siv ntawm qhov kub thiab txias ntawm +25 ° C.
Yuav kom tau txais qhov xav tau luminosity, LED teeb tam sim no yuav tsum tau teem rau 20 mA.
Qhov ntsuas kub ua haujlwm tau lees paub rau cov khoom siv yog -10 ° txog +70 ° C.
Yog tias qhov tam sim no derated rau qhov kub thiab txias raws li qhia hauv daim duab 1, ntawm +70 ° C, LED teeb tam sim no yuav tsum tau teem rau ntawm lossis tsawg dua 12 mA. Li no tus qauv tsim uas yields LED teeb tam sim no ntawm 22 mA tsis tso cai. Txawm li cas los xij, qee qhov lwm hom LEDs uas emit tib xim muaj lawv qhov tam sim no derated coj mus rau hauv tus account qhov kub thiab txias, raws li pom nyob rau hauv daim duab 2. Txij li thaum cov LEDs muaj peev xwm tuav tau ib tug tam sim no ntawm 27 mA ntawm ib tug kub ntawm +70 ° C, lawv txaus siab. cov qauv tsim saum toj no.
Derating LEDs rau Longevity
Yam ntxwv, qhov luminous siv ntawm LEDs maj mam txo qis dua lub neej ntawm LED. Tus nqi ntawm qhov kev siv luminous ntog sib txawv raws li cov khoom siv thiab cov khoom siv rau pem hauv ntej uas lub LED tsav. Qhov loj dua tam sim no, qhov ntau dua qhov diminution ntawm luminosity. Yog li, thaum teeb tsa qhov tam sim no ntawm LED teeb, tsis txhob txiav txim siab qhov teeb tsa nkaus xwb los ntawm cov yam ntxwv ntawm qhov kub thiab txias, xws li hauv cov piv txwv saum toj no, tab sis xav txog cov yam ntxwv ntawm lub neej ntev. Ib txoj hauv kev zoo ntawm kev txhim kho cov yam ntxwv ntawm lub neej ntev yog teeb tsa rau pem hauv ntej tam sim no ntawm LED teeb kuj qis.
