LED (Lub Teeb Emitting Diode), raws li kev ua tau zoo, txuag hluav taws xob, thiab cov khoom siv teeb pom kev zoo ib puag ncig, ua lub luag haujlwm tseem ceeb hauv cov cuab yeej teeb pom kev zoo niaj hnub no. Txawm li cas los xij, rau cov kws tshaj lij, cov yam ntxwv hluav taws xob ntawm LEDs yuav tsis meej meej, tshwj xeeb tshaj yog hais txog qhov siab tshaj plaws uas LEDs tuaj yeem tiv taus.
1, Cov yam ntxwv hluav taws xob ntawm LED
LED yog cov khoom siv semiconductor uas tawm lub teeb los ntawm cov khoom siv hluav taws xob zoo siab hauv cov khoom siv semiconductor los ntawm cov khoom siv tam sim no, ua rau lawv hloov pauv ntawm lub zog qis mus rau qib siab zog, thiab tom qab ntawd tso tawm lub zog thaum cov hluav taws xob rov qab mus rau qis zog, tshwm sim raws li lub teeb emission. Cov yam ntxwv hluav taws xob ntawm LED yog ze rau nws cov khoom siv, qauv, thiab cov txheej txheem tsim khoom.
Lub rau pem hauv ntej voltage (Vf) ntawm ib qho LED hais txog rau pem hauv ntej bias voltage xav tau rau LED kom emit lub teeb ib txwm. Ntau hom LEDs muaj qhov sib txawv rau pem hauv ntej, feem ntau ntawm 1.5V thiab 3.5V. Txawm li cas los xij, kev ua haujlwm voltage ntawm LED tsis txwv rau nws qhov hluav taws xob rau pem hauv ntej, tab sis kuj yuav tsum tau xav txog lwm yam xws li kev txwv tam sim no thiab rov qab voltage kam rau ua.
2, Kev ua haujlwm voltage ntau ntawm LED
Kev ua haujlwm voltage ntau ntawm LED feem ntau yog txiav txim siab los ntawm nws qhov hluav taws xob rau pem hauv ntej thiab kev txwv tam sim no. Hauv kev siv tswv yim, txhawm rau ua kom muaj kev nyab xeeb ntawm LEDs, ib qho kev tiv thaiv uas tsim nyog feem ntau txuas nrog hauv cov koob los txwv qhov tam sim no. Tus nqi tsis kam ntawm qhov resistor yuav tsum raug xam raws li qhov hluav taws xob pem hauv ntej ntawm LED thiab qhov yuav tsum tau ua haujlwm tam sim no.
Feem ntau hais lus, kev ua haujlwm voltage ntau ntawm LEDs yog nyob nruab nrab ntawm 2V thiab 5V, thiab tus nqi tshwj xeeb nyob ntawm hom thiab specifications ntawm LED. Tshaj qhov ntau yam no yuav ua rau LED puas tsuaj lossis kev ua haujlwm tsis zoo.
3, Cov yam ntxwv cuam tshuam rau qhov voltage endurance ntawm LED
Cov khoom siv thiab cov qauv: Cov khoom siv thiab cov qauv ntawm LED muaj qhov cuam tshuam ncaj qha rau nws qhov muaj peev xwm ntawm cov kabmob. Cov yam ntxwv ntawm cov ntaub ntawv sib txawv, xws li bandgap dav thiab cov neeg nqa khoom txav mus los, ua rau muaj qhov sib txawv rau pem hauv ntej thiab thim rov qab voltage ntawm LEDs.
Cov txheej txheem tsim khoom: Cov txheej txheem tsim khoom ntawm LED muaj qhov cuam tshuam loj rau nws cov yam ntxwv hluav taws xob. Cov txheej txheem tsim khoom zoo tuaj yeem ua kom ntseeg tau tias LEDs muaj kev ua tau zoo ntawm hluav taws xob thiab kev ua haujlwm siab dua.
Kev ua hauj lwm tej yam kev mob: Cov kev ua hauj lwm ntawm LEDs kuj muaj feem xyuam rau lawv voltage kam rau ua. Piv txwv li, qhov kub thiab txias ib puag ncig yuav ua rau txo qis rau pem hauv ntej voltage ntawm LEDs, thaum lub sij hawm rov qab voltage kam rau siab kuj yuav cuam tshuam. Tsis tas li ntawd, kev ua haujlwm siab tam sim no ntev kuj tseem tuaj yeem ua rau txo qis hauv LED kev ua haujlwm, txo nws qhov voltage endurance.
4, Yuav ua li cas txiav txim siab qhov siab tshaj plaws voltage uas LED tuaj yeem tiv taus
Txhawm rau txiav txim siab qhov siab tshaj plaws qhov hluav taws xob uas LED tuaj yeem tiv taus, nws yog thawj zaug uas yuav tsum tau nkag siab qhov hluav taws xob rau pem hauv ntej thiab rov qab tawg voltage ntawm LED. Qhov hluav taws xob rau pem hauv ntej yog qhov tsis zoo ntawm qhov hluav taws xob uas LED emits lub teeb ib txwm, thaum qhov hluav taws xob thim rov qab yog qhov hluav taws xob uas LED pib ua hauv qab qhov hluav taws xob rov qab. Feem ntau hais lus, qhov thim rov qab qhov hluav taws xob ntawm LEDs siab dua lawv qhov hluav taws xob rau pem hauv ntej.
Hauv kev siv cov tswv yim, txhawm rau ua kom muaj kev nyab xeeb ntawm LEDs, nws yog ib qho tsim nyog kom tsis txhob teeb tsa lawv cov kev khiav hauj lwm voltage siab dhau. Feem ntau hais lus, teeb tsa kev khiav hauj lwm voltage ntawm LEDs ntawm 1.2 thiab 1.5 npaug rau pem hauv ntej voltage kuj muaj kev nyab xeeb. Nyob rau tib lub sijhawm, lwm yam yuav tsum tau xav txog, xws li qhov kub thiab txias, kev ua haujlwm tam sim no, thiab lwm yam.
Hauv cov ntsiab lus, qhov voltage endurance ntawm LED yog cuam tshuam los ntawm ntau yam xws li nws cov khoom, qauv, kev tsim khoom, thiab kev ua haujlwm. Txhawm rau kom muaj kev nyab xeeb ntawm kev ua haujlwm thiab kev ruaj ntseg ntev ntawm LEDs, nws raug nquahu kom ua raws li cov lus pom zoo hauv qab no hauv kev siv tswv yim:
Nkag siab thiab ua raws li cov yam ntxwv hluav taws xob ntawm LEDs kom ntseeg tau tias qhov ua haujlwm voltage nyob hauv qhov tsim nyog.
Xaiv cov khoom lag luam zoo LED thiab cov chaw tsim khoom kom ntseeg tau tias lawv muaj hluav taws xob zoo thiab muaj zog tiv taus.
Thaum tsim ib lub voj voog, teeb tsa tus nqi tiv thaiv kom txo tau qhov tam sim no thiab zam kev puas tsuaj ntawm LED los ntawm overcurrent.
Tsis tu ncua tshuaj xyuas thiab tswj cov khoom siv LED kom ntseeg tau tias nws ua haujlwm zoo.
Los ntawm kev ua raws li cov lus qhia no, peb tuaj yeem siv qhov zoo ntawm LED kom ua tiav cov txiaj ntsig zoo, txuag hluav taws xob, thiab lub hom phiaj teeb pom kev zoo ib puag ncig.
