Dimming technology siv DC fais fab LED
Nws yog ib qho yooj yim los hloov lub ci ci ntawm LED los ntawm kev kho lub hauv ntej tam sim no los kho qhov ci. Thawj qhov kev xav yog hloov nws cov tsav tam sim no, vim tias qhov ci ntsa iab ntawm LED yuav luag ncaj qha proportional rau nws tsav tam sim no.
1.1 Txoj kev kho rau pem hauv ntej tam sim no
Txoj kev yooj yim tshaj plaws los kho qhov tam sim no ntawm LED yog hloov qhov ntsuas tam sim no resistor txuas nrog hauv cov khoom siv nrog cov khoom siv LED. Yuav luag tag nrho DC-DC cov chips tsis tu ncua tam sim no muaj qhov cuam tshuam los txheeb xyuas qhov tam sim no. Tam sim no tsis tu ncua. Txawm li cas los xij, tus nqi ntawm qhov ntsuas qhov ntsuas no feem ntau me me, tsuas yog ob peb ohms, yog tias koj xav nruab ib lub potentiometer ntawm phab ntsa los kho qhov tam sim no tsis zoo li, vim tias cov hlau lead kuj tseem yuav muaj ob peb ohms. Yog li ntawd, qee qhov chips muab kev tswj hwm qhov hluav taws xob. Hloov cov input tswj voltage tuaj yeem hloov cov zis tam sim no tus nqi.
1.2 Kho qhov tam sim no rau pem hauv ntej yuav hloov chromatogram
Txawm li cas los xij, siv txoj hauv kev tam sim no los kho qhov ci yuav ua rau muaj teeb meem, uas yog, nws yuav hloov nws cov spectrum thiab xim kub thaum kho qhov ci. Tam sim no, cov LEDs dawb yog tsim los ntawm kev zoo siab xiav phosphors nrog xiav LEDs. Thaum lub sijhawm tam sim no txo qis, qhov ci ntawm xiav LEDs nce thiab lub thickness ntawm daj phosphors tsis txo qis proportionally, yog li ua rau cov tseem ceeb wavelength ntawm nws spectrum. Piv txwv li, thaum tam sim no rau pem hauv ntej yog 350mA, xim kub yog 5734K, thiab thaum lub tom ntej tam sim no nce mus rau 350mA, xim kub hloov mus rau 5636K. Thaum qhov tam sim no txo qis dua, cov xim kub yuav hloov mus rau xim sov.
Tau kawg, cov teeb meem no yuav tsis yog teeb meem loj hauv kev teeb pom kev zoo. Txawm li cas los xij, nyob rau hauv RGB LED system, nws yuav ua rau xim hloov, thiab tib neeg lub qhov muag yog rhiab heev rau xim sib txawv, yog li nws kuj tsis tso cai.