LED yog ntau dua thiab dav siv hauv cov teeb pom kev zoo. Ntxiv nrog rau nws qhov tshwj xeeb zoo dua li cov qauv teeb pom kev zoo, ntxiv rau kev txhim kho lub neej zoo, txhim kho cov txiaj ntsig ntawm lub teeb thiab ua kom lub neej ntev ntawm cov teeb pom kev zoo, LED siv nws qhov tshwj xeeb dimming muaj nuj nqi los hloov xim kub thiab ci ci ntawm lub teeb. , thiab ua tiav qhov zoo tshaj plaws ntawm kev siv hluav taws xob txuag.

Lub dimming efficiency ntawmLED teeb pom kev zoofixtures nyob ntawm qhov matched LED teeb qhov chaw thiab tsav tsheb fais fab mov.

Feem ntau,LED teeb qhov chawtuaj yeem muab faib ua ob pawg: ib leeg LED diode lub teeb los yog LED diode lub teeb qhov chaw nrog kev ua haujlwm. Nyob rau hauv daim ntawv thov, tej zaum LED teeb qhov chaw yog tsim raws li ib tug module uas muaj DC-DC converter, thiab xws li complex modules tsis tau tham nyob rau hauv tsab xov xwm no. Yog hais tias lub teeb ci LED lossis module yog cais LED diode nws tus kheej, txoj kev dimming feem ntau yog los kho qhov amplitude ntawm LED input tam sim no, yog li kev xaiv ntawm LED tsav lub zog yuav tsum xa mus rau qhov no.

Hom LED tsis zoo dimming tej yam kev mob:

Thaum tus tsav tsheb LED fais fab nrog cov zis tawm tam sim no siv rau dimming LED teeb, deadtravel yog ib qho teeb meem tshwm sim. Txawm tias covLED tsav tshebfais fab mov tuaj yeem ua haujlwm tau zoo thaum nws nyob rau hauv tag nrho cov load, nws yog pom tseeb tias qhov dimming tsis du thaum lub LED tsav tsheb tsis nyob rau hauv tag nrho load.

Solution of Output Pulse Width Modulation (Output PWM)

Yog tias LED tsav lub zog siv rau LED teeb bar dimming nyob rau hauv tag nrho cov load, tsis muaj teeb meem ntawm deadtravel. Cov lus sib cav saum toj no muaj tseeb, tab sis nws tsis yog qhov ua tau zoo heev. Qhov tseeb, LED lub teeb strips feem ntau siv ntau yam kev siv (duab teeb pom kev zoo / pab teeb pom kev zoo / teeb pom kev tshaj tawm) qhov ntev tsis tuaj yeem kwv yees kom raug. Yog li ntawd, qhov yooj yim thiab zoo tshaj plaws daim ntawv thov kev daws teeb meem yog kom raug xaiv LED tsav lub zog nrog cov zis pulse dav PWM dimming muaj nuj nqi kom ua tau raws li qhov yuav tsum tau dimming ntawm LED strips. Cov zis brightness tuaj yeem txo qhov dimming hloov ntawm qhov ci ci los ntawm kev tsim txiaj ntawm lub voj voog ntawm lub teeb liab dimming. Cov tsis tseem ceeb rau kev xaiv lub zog tsav yog dimming kev daws teeb meem thiab zaus ntawm cov zis pulse width modulation PWM. Qhov tsawg kawg nkaus dimming muaj peev xwm yuav tsum tsawg li 0.1% kom ua tiav 8 ntsis dimming kev daws teeb meem kom tau raws li tag nrho cov LED teeb bar dimming daim ntaub ntawv. Cov zis pulse dav modulation PWM zaus yuav tsum siab npaum li qhov ua tau, Txhawm rau tiv thaiv qhov teeb meem ntawm lub teeb flicker tau hais hauv Table (I), raws li cov ntaub ntawv tshawb fawb txog kev tshawb fawb, qhov zaus raug pom zoo kom tsawg kawg siab dua 1.25 kHz kom txo cov flicker ntawm ghosts pom rau tib neeg lub qhov muag.