Phau Ntawv Qhia Txog Kev Txiav Txim Dimmability ntawm LEDs

LED teeb muaj ntau zuj zus nyob rau hauv lub neej niaj hnub. Lawv ua ib qho kev hloov tsim nyog uas muab kev txuag hluav taws xob tseem ceeb rau kev hloov lub teeb uas tsis muaj nyob hauv ob qho tib si kev lag luam thiab chaw nyob. LEDs tau muab tso rau hauv cov qauv teeb pom kev zoo, ua kom nrawm nrawm rau hauv cov khoom siv sib xws, yog li ua kom yooj yim hloov cov teeb pom kev tsis zoo (incandescent, fluorescent, halogen, thiab lwm yam) nrog superiorLED qhov muag teevthaum tuav cov tsoos fixtures yog xav tau.
Txawm li cas los xij, tsis yog txhua lub LEDs muaj peev xwm dimmable.
Koj yuav tsum ntsuas koj cov kev xav tau ua ntej xaiv kojLED teeb. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog thaum hloov cov teeb pom kev tsis zoo nrog cov thev naus laus zis niaj hnub LED thawj zaug thiab cia siab tias muaj peev xwm dimming.

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Kab lus no yuav piav qhia yuav ua li cas txhawm rau txheeb xyuas qhov dimmability ntawm LED thiab txheeb xyuas qhov tsim nyog LED dimmers.

Nws yog ib qho chaw rau cov chav hauv peb lub tsev muaj ntau yam haujlwm. Cov chav ua noj niaj hnub no ua qhov chaw ua noj, noj mov, thiab ua haujlwm ua chaw ua haujlwm txhua hnub.
Dimmable teeb pom kev zoo muab cov kev hloov kho kom haum lub teeb pom kev hauv koj ib puag ncig nrog koj cov dej num. Ib tug tuaj yeem xaiv lub teeb muaj zog rau kev ua haujlwm hauv phau ntawv, tab sis qhov muag muag, soothing lub teeb rau hmo noj hmo.
Dimming tau nce siv hauv kev lag luam thiab chaw lag luam. Kev teeb pom kev zoo dimmable ua kom muaj ntau yam ntawm koj qhov chaw ua haujlwm ib puag ncig, ua kom haum raws li qhov xav tau ntawm koj cov neeg ua haujlwm. Kev tshawb fawb dav dav tau tsom mus rau ob qho tib si dimming thiab xim hloov hauv qhov chaw ua haujlwm; Yog xav paub ntxiv txog kev hloov kho teeb pom kev zoo, saib ntawm no.

Tsis yog txhua lub teeb LED muaj qhov ua haujlwm dimmable; Yog li ntawd, nws yog ib qho tseem ceeb rau kev txheeb xyuas qee yam los xyuas kom meej tias koj xaiv lub teeb dimmable pib:
Xyuas kom tseeb tias lub pob ntawm cov khoom siv LED los yog lub teeb qhia meej meej tias nws yog dimmable. Qhov no yuav tsum muaj nyob rau hauv cov lus piav qhia lossis cov kev qhia tshwj xeeb ntawm lub teeb. Kev siv lub teeb tsis muaj -dimmable LED nrog lub dimmer yuav ua rau muaj kev cuam tshuam loj thiab tuaj yeem ua rau lub teeb, yog li txo nws txoj sia.
#2 - Puas yog koj lub dimmer sib haum nrog LED teeb? Thaum hloov lub teeb incandescent nrog LEDs, tej zaum koj yuav muaj ib tug ua -ntug dimmer. Ib qho dimmer yav dhau los zoo li yuav raug tsim kho rau lub teeb pom kev zoo dua qub thiab tej zaum yuav tsis sib haum nrog cov teeb pom kev tsawg -wattage LED. Hauv cov xwm txheej no, koj yuav tsum xaiv lwm qhov dimmer; thov xa mus rau peb cov lus pom zoo thaum xaus ntawm tsab ntawv no.

Dimmability ntawm ibLED teebtso siab rau tus tsav tsheb LED uas lub teeb ua haujlwm.
Txhua lub qhov muag teev LED muaj tus tsav tsheb uas hloov lub zog mus rau qhov qis -voltage tsis tu ncua tam sim no tseem ceeb rau kev ua haujlwm LED.
Thaum tsim koj tus kheej teeb tsa nrog cov khoom siv LEDs, koj muaj qhov zoo ntawm kev xaiv txhua tus tsav tsheb uas koj xaiv, nrog rau koj qhov kev xav dimming chaw. Thaum muas lub teeb ua tiav LED lossis lub teeb, ib qho yog txwv los ntawm qhov teeb tsa dimming xaiv los ntawm cov chaw tsim khoom.
Tsis yog -dimmable LED tsav tsheb suav nrog tsuas yog ob lub xeev ua haujlwm: ON thiab OFF. Thaum hloov mus rau lub teeb LED, tus tsav tsheb uas tsis yog -dimmable yuav sim ua kom ruaj khov tam sim no. Qhov no thaum kawg yuav overstrain tus tsav tsheb LED, ua rau nws tsis ua hauj lwm.
Dimmable tsav tsheb, hloov pauv, yog tsim los tswj kev hloov pauv tam sim no. Dimmable tsav tsheb yuav hloov kho tam sim no poob los ntawm dimming lub LED siv analogue los yog mem tes dav modulation (PWM) cov tswv yim.

LEDs muaj cov yam ntxwv dimming txawv piv rau cov teeb pom kev zoo ib txwm muaj, yuav tsum tau ua tib zoo xav txog kev dimming thoob plaws hauv kev npaj ntawm kev hloov pauv LED.
Piv txwv li, lub teeb incandescent tsim lub teeb los ntawm cua sov ib lub xov hlau mus rau qhov chaw ntawm incandescence. Txhawm rau txo qhov ci ntsa iab, txo qhov hluav taws xob, ua rau cov xaim txias txias uas tawm lub teeb tsawg dua.
LED qhov muag teeb tsim teeb pom kev siv lub diode es tsis yog cov khoom siv cua sov. Lub diode muaj tsuas yog ob lub xeev: nws yog ON, emitting lub teeb, lossis OFF, ua rau qhov tsaus ntuj.
Dimming LEDs xav tau lwm txoj hauv kev los tsim cov dimmable LED teeb pom kev zoo. Ob lub tswv yim tseem ceeb rau dimming LEDs yog Pulse Width Modulation (PWM) thiab analogue dimming.

PWM muab kev dimming muaj peev xwm los ntawm kev kho lub sijhawm ntawm lub teeb liab ON thiab OFF xeev. Nrog PWM dimming, lub teeb -emitting diode tsuas tuaj yeem nyob hauv lub xeev ON lossis OFF lub sijhawm twg los tau. Qhov no txawv ntawm analogue dimming, uas hloov cov zis hluav taws xob kom txo qis LED ci.

Siv pulse width modulation, kom ua tiav 80% ci ntsa iab hauv LED, ib qho yuav tuav lub LED hauv lub xeev nquag rau 80% ntawm lub sijhawm thiab tsis ua haujlwm rau qhov seem 20%. Nws yog qhov laj thawj uas koj yuav muaj nyob ib puag ncig 80% ntawm lub teeb tso zis; tseem, dab tsi suav nrog rau peb qhov tsis muaj peev xwm pom lub LED nrawm ntawm - tawm ntawm kev caij tsheb kauj vab?
PWM dimming peev ntawm qhov kev txwv ntawm tib neeg qhov muag. Lub teeb flickers ntawm ib zaus saum toj no tib neeg lub qhov muag pom, uas nyob ib ncig ntawm 50 mus rau 90 Hz (nyob ib ncig ntawm 60 ntas ib ob). Thaum lub teeb ci ntsa iab ntawm qhov nrawm nrawm, peb lub hlwb cuam tshuam lub sijhawm, tsim kom muaj kev nkag siab ntawm lub zeem muag du.
Kev ceev faj nrog PWM dimming, tshwj xeeb tshaj yog thaum siv teeb pom kev zoo rau cov yeeb yaj kiab lossis yees duab. Thaum tib neeg qhov muag tsis pom kev yuav tsis pom PWM flickering, siab - lub koob yees duab zoo yuav pom tau cov nyhuv hloov maj mam thaum lub teeb hloov mus rau theem qis. Ib tug yuav tsum nrhiav qhov zoo tshaj dimming lwm txoj rau PWM thaum koom nrog videography.

Txoj kev dimming no tau txais txiaj ntsig tseem ceeb hauv kev lag luam teeb pom kev zoo fluorescent. Qhov kev daws teeb meem no zoo rau kev teeb tsa LED, ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov teeb fluorescent retrofitting. Lub teeb pom kev zoo yog tswj hwm los ntawm qhov tshwj xeeb DC voltage teeb liab uas txawv ntawm xoom mus rau kaum volts. Koj puas nkag siab lub npe tam sim no? Qhov no ua rau lub teeb tswj tau ua haujlwm ntawm 100% cov zis nrog tag nrho qhov hluav taws xob thiab 0% cov zis tsis muaj hluav taws xob. Lub luminosity ntawm koj lub teeb sib txawv raws li qhov voltage theem ntawm cov teeb liab tswj.

Ua ntug dimming, tseem hu ua rau pem hauv ntej theem -txiav, incandescent, los yog TRIAC dimming, yog cov txheej txheem dimming tseem ceeb.
Qhov tseem ceeb ntawm cov dimmers no yog TRIAC Dimmers, uas ua haujlwm ua - ntu ntu txiav kom txo cov hluav taws xob tam sim no rau lub teeb.
Qhov dimmer no feem ntau muab tso rau hauv qhov chaw nyob vim nws tsim nyog rau kev siv hluav taws xob siab uas xav tau los ntawm feem ntau cov teeb pom kev zoo. Thawj qhov teeb meem nrog TRIAC dimming yog qee zaus tshwm sim ntawm buzzing lossis flickering hauv lub teeb. Qhov no yuav tshwm sim vim qhov kev vibrations tsim los ntawm fragmented AC kis tau tus mob.
Hmoov zoo, ntau tus TRIAC dimmers tam sim no tau hais txog qhov teeb meem no thiab siv cov kev ntsuas los tiv thaiv flickering. Ntau lub dimmable LED tsav tsheb lossis LED dimmers tau ua lag luam raws li muaj flicker - tsim dawb.

Ib qho trailing ntug dimmer yog ib qho tsis tshua muaj hom dimming. Qhov no tau txheeb xyuas tom qab tau txais kev coj ua -ntug raws li tus qauv, uas yog qhov zoo dua rau cov teeb pom kev tsis tshua muaj hluav taws xob xws li LEDs. Vim nws qhov tsis tshua muaj, qhov kev dimming no tsis nquag ua haujlwm raws li qhov xav tau.
Es tsis txhob txiav lub waveform thaum pib, cov ntug trailing intersects lub posterior ntug ntawm AC sine yoj. Qhov no txwv tsis pub muaj qhov hloov pauv ntawm qhov hluav taws xob tseem ceeb tshwm sim thaum ua - ntug dimming, raws li lub waveform nres thaum nws twb nyob rau hauv ib qho kev poob qis.
Kev txwv tsis pub muaj kev hloov pauv tseem ceeb txo cov teeb meem flickering uas cuam tshuam nrog LEDs thiab TRIAC dimming. Txawm li cas los xij, raws li tau hais dhau los, kev txiav- ntug dimming tau txais kev nce qib hauv kev tshawb fawb thiab thev naus laus zis uas tau txo cov kev txhawj xeeb no zoo.