LEDs dim txawv dua li hom teeb pom kev zoo qub uas yog vim li cas qhov dimming yuav tsum tau ua tib zoo coj mus rau hauv tus account thaum npaj ib qho LED retrofit.
Piv txwv li, piv txwv li cov qij taws teeb…lawv tsim lub teeb los ntawm kev ua cov hlau filament kub kom nws ci. Ua kom nws dim, tsuas yog muab tsawg dua voltage thiab cov hlau txias tawm, muab lub teeb tsawg dua. Qhov no yog ib qho piv txwv ntawm analog dimming li koj tuaj yeem dim ntawm 0-100% los ntawm kev kho qhov hluav taws xob mus rau lub teeb ci.
LED qhov muag teev tsim lub teeb los ntawm lub diode, tsis yog ib qho rhuab filament. Lub diode tsuas muaj ob lub xeev: nws yog ON thiab tsim teeb lossis OFF thiab, koj twv nws… tsaus.
Qhov no yog vim li cas qhov dimming LEDs txawv me ntsis raws li peb yuav tsum nrhiav lwm txoj hauv kev los tsim cov khoom lag luam dimmable LED teeb pom kev zoo. Muaj ob txoj hauv kev tseem ceeb ntawm dimming LEDs: Pulse Width Modulation (PWM) thiab analog dimming.
Pulse Width Modulation (PWM)
PPWM muaj ntau yam dimming los ntawm qhov sib txawv ntawm lub sijhawm lub teeb liab ON lossis OFF. Nrog PWM dimming lub teeb-emitting-diode tsuas tuaj yeem ON lossis OFF thaum twg los tau. Qhov no txawv ntawm analog dimming li analog dimming sib txawv ntawm cov zis hluav taws xob rau dim LEDs.
Nrog mem tes dav modulation, yog tias koj xav kom dim lub LED mus rau 80% ci ntsa iab, ces koj yuav khaws lub LED rau 80% ntawm lub sij hawm thiab tawm rau lwm 20%. Qhov no ua rau kev txiav txim siab tias koj yuav muaj li 80% lub teeb tso zis, tab sis ua li cas peb tsis pom lub LED hloov thiab tawm?
PWM dimming siv teeb meem nrog peb lub zeem muag. Lub teeb yog flickering ntawm tus nqi siab uas tib neeg lub qhov muag tsis pom nws, tib neeg lub qhov muag tuaj yeem pom ntawm li 50-90Hz (txog 60 ntas ib ob). Thaum lub teeb ci ntsa iab ntawm qhov ceev ceev, peb lub hlwb sau rau hauv qhov khoob kom peb lub zeem muag zoo.
Ceev faj nrog PWM dimming tshwj xeeb tshaj yog tias koj siv lub teeb pom kev hauv zaj duab xis lossis yees duab. Tib neeg lub zeem muag yuav tsis ntes PWM flickering tab sis lub koob yees duab zoo yuav twv yuav raug hu me ntsis strobe thaum lub teeb nyob ntawm qhov chaw dim. Koj yuav tsum nrhiav qhov kev xaiv dimming zoo dua li PWM thaum ua haujlwm hauv videography.
