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Yuav ua li cas thiaj poob Dimming LED txoj teeb pom kev zoo?

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Dimming LED txoj kev teeb pom kev zoo

Raws li qhov tam sim no qhov chaw, LED yuav dimmed inherently. "Tus tam sim no ntws los ntawm cov teeb LED teeb coj los txiav txim qhov tso zis lub teeb." Lawv cov ci ntsa iab tuaj yeem kho tau yooj yim los ntawm kev tswj lub zog tam sim no ntawm txheej ntawm semiconductor khoom nqis rau lub substrate.

LED tsis nyiam cov teeb pom kev, qhov tsis kam thiab yuav tsis cuam tshuam rau qhov ua haujlwm thiab lub neej ntawm LED. Nyob rau hauv qhov tseeb, dimming yuav txo tau lawv khiav hauj lwm kub, yog li extending lub neej ntawm lub LED.
Tsis tas li ntawd, qhov ntau ntawm LEDs yog qhov dav dua li ntawm cov khoom siv hluav taws xob compact fluorescent thiab siab siv paug tawm teeb. Piv rau lub compact fluorescent teeb ntawm 10% mus rau 30% ntawm lub dimming (cov ntaub ntawv los ntawm American Hluav Taws Xob Manufacturers Association NEMA), siv hluav taws xob ntau lub teeb 30% mus rau 60% ntawm lub dimming (cov ntaub ntawv los ntawm US teeb khoom khoom tsim engineering engineering NLPIP) LED dimming yuav ua tau los ua kom tiav tag nrho cov load hauv qab 1%.

Cov khoom siv hluav taws xob (LED), yog tias koj xav ua lub teeb ci hloov lossis LED teeb pom kev zoo, xav tau ib lub tsheb thiaj li ncav cuag. Vim tias LEDs low-voltage DC sources, LEDs yuav tsum tau ib qho hluav taws xob tsav hloov AC mus rau hauv usable thiab adjustable DC tam sim no. Cov drives no tau muab faib ua ob zaug. Hauv qhov mem tes dav tes taws xob (PWM) hom, tam sim no los ntawm cov LED yog muab tua ntawm ib lub sijhawm muaj ntau zaus, "feem ntau yog ntau txhiab lub sij hawm ib ob," thiab tam sim no los ntawm LED yog sib npaug zos rau tam sim no hauv kev hloov switching cycle . Txo cov teebmeem hauv lub sijhawm no tuaj yeem txo qhov nruab nrab lossis tam sim no, uas yog txo cov teeb ci ntawm LED.
PWM thiab CCR muaj lawv qhov zoo thiab qhov tsis zoo. PWM daim ntawv thov yog ntau dua, qhov ua kom tsis muaj dav yog wider, tuaj yeem ua lub teeb tawm ntawm 1% los yog tsawg dua, thiab tsis hais tus LED nyob rau tam sim no, qhov siab tshaj plaws tam sim no, los yog xoom ua hauj lwm tam sim no, tuaj yeem zam xim xim dawb. Vim hais tias PWM dimming siv ceev ceev rau thiab tawm, nws yuav tsum tau ntau dua li tus nqi hluav taws xob thiab ntau nqi hluav taws xob kom tsim kom muaj txaus siab tam sim no pulses kom tiv thaiv flickering ntawm tib neeg qhov muag.
CCR dimming yog ntau yam yooj yim thiab yooj yim vim tias nws yuav tsum tau yooj yim dua thiab pheej yig dua cov cuab yeej tsav tsheb. Tsis zoo li PWM, CCR tsis tsim cov kev cuam tshuam ntawm electromagnetic los ntawm kev hloov ntau ntawm EMI. Tsis tas li ntawd, CCR pub tus tsav mus kom deb ntawm lub teeb ci, uas yog qhov zoo rau kev hloov lub teeb ci nrog LEDs los yog kev sib txuas compactures nrog luag chaw. Txawm li cas los xij, CCR tsis haum rau cov ntawv thov uas qhov kev tsis sib haum xeeb yog tsawg dua 10%. "Nyob rau hauv tsis tshua muaj teeb meem tam sim no, LED tsis ua hauj lwm zoo, lub teeb tso zis tsis ruaj khov.

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