3 txoj kev sib txuas ntawm LED teeb hlaws
Kev teeb tsa ntawm LEDs hauv ib daim ntawv thov yog nyob ntawm ntau yam, suav nrog cov kev xav tau ntawm daim ntawv thov, LED tsis muaj thiab ntau, input voltage, efficiency, thermal tswj, loj thiab layout txwv, thiab optics. Daim ntawv teeb tsa yooj yim tshaj plaws yog ib qho LE, thiab muaj ntau daim ntawv thov siv qhov tsim, xws li tsheb sab hauv dome teeb (daim ntawv qhia teeb, nyeem ntawv) thiab lwm yam.
Txij li thaum lub zog thiab ci ntsa iab ntawm LEDs tsis siab heev nyob rau tam sim no, thiab lub sijhawm siv tiag tiag feem ntau xav tau lub teeb pom kev zoo, nws yog ib qho tsim nyog los npaj thiab sib txuas ntau yam LEDs raws li qhov yuav tsum tau ua kom tau raws li qhov xav tau ntawm qhov loj-loj, siab-brightness, dynamic zaub. , xim hloov thiab lwm yam kev siv. cov kev xav tau thiab kev sib txuam ntawm cov LEDs thiab cov tsav tsheb txhawb nqa.
1. Cov ntaub ntawv sib txuas
1. Zuag qhia tag nrho series kev twb kev txuas
1.1 Daim ntawv sib txuas yooj yim
Feem ntau, hauv daim ntawv sib txuas yooj yim, LED1 ~ LEDn txuas rau qhov kawg, thiab cov dej ntws los ntawm LEDs sib npaug thaum lawv ua haujlwm. Rau LEDs ntawm tib lub specification thiab batch, txawm hais tias tej zaum yuav muaj qhov sib txawv me ntsis ntawm qhov hluav taws xob ntawm ib qho LED, vim tias cov LEDs yog cov khoom siv tam sim no, lawv tuaj yeem ua kom muaj kev sib zog zoo tib yam. LED muaj cov yam ntxwv ntawm qhov yooj yim Circuit Court thiab kev sib txuas yooj yim. Txawm li cas los xij, vim yog kev sib txuas ntawm cov koob, thaum ib qho ntawm LEDs muaj qhov qhib-circuit txhaum, tag nrho LED teeb hlua yuav raug tua, cuam tshuam rau kev ntseeg tau ntawm kev siv.
1.2 Series Daim ntawv nrog Parallel Zener Diodes
Ib qho kev hloov kho kev sib txuas ntawm Zener diode nyob rau hauv parallel nrog txhua LED. Hauv qhov kev sib txuas no, qhov tawg ntawm txhua qhov Zener diode yog siab dua qhov kev ua haujlwm voltage ntawm LED. Thaum lub LED ua haujlwm ib txwm, txij li Zener diodes VD1 ~ VDn tsis yog tus coj, tam sim no feem ntau ntws los ntawm LED1 ~ LEDn. Tsuas yog cov teeb meem LED, lwm LEDs tseem muaj tam sim no ntws los ntawm thiab tawm lub teeb. Piv nrog rau kev sib txuas yooj yim series, txoj kev sib txuas no zoo heev hauv kev ntseeg tau.
2. Kev sib txuas ua ke tag nrho
2.1 Simple parallel form
Nyob rau hauv daim ntawv yooj yim thaum uas tig mus, LED1 ~ LEDn txuas nrog rau qhov kawg mus rau qhov kawg, thiab txhua lub LED dais tib qhov hluav taws xob thaum ua haujlwm. Nws tuaj yeem pom los ntawm cov yam ntxwv ntawm LED tias nws yog cov cuab yeej tam sim no, thiab qhov hloov me me ntawm qhov hluav taws xob siv rau LED yuav ua rau muaj kev hloov pauv loj hauv tam sim no. Tsis tas li ntawd, vim muaj kev txwv ntawm LED kev tsim tshuab, txawm tias tib lub teeb ntawm LEDs, qhov sib txawv ntawm kev ua tau zoo yog qhov tshwm sim, yog li thaum LED1 ~ LEDn ua haujlwm, leej twg dhau qhov tam sim no ntawm txhua LED tsis sib npaug. Nws tuaj yeem pom tias qhov ua tsis tau ntawm qhov kev faib tawm tam sim no ntawm txhua lub LED tuaj yeem txo qis lub neej ntawm LEDs nrog ntau dhau tam sim no, lossis txawm tias hlawv lawv tawm. Txoj kev sib txuas no yog qhov yooj yim heev. Txawm li cas los xij, qhov kev ntseeg siab tsis yog siab, tshwj xeeb tshaj yog rau cov ntawv thov nrog ntau tus LEDs, nws yuav ua rau tsis ua haujlwm hauv kev siv.
2.2 Parallel daim ntawv ntawm kev sib tw ywj pheej
Rau cov teeb meem kev ntseeg siab uas muaj nyob rau hauv kev sib txuas yooj yim sib txuas, daim ntawv sib txuas ntawm kev sib koom ua ke yog ib txoj hauv kev zoo. Txhua LED nyob rau hauv txoj kev no nws muaj nws tus kheej adjustable tam sim no (V ntxiv rau cov zis terminals ntawm tus tsav tsheb yog L1 ~ Ln, raws li), uas xyuas kom meej tias tam sim no ntws los ntawm txhua LED nyob rau hauv nws yuav tsum tau ntau yam, nrog zoo tsav tsheb thiab ib tug tib LED. . Kev tiv thaiv ua tiav, qhov tsis ua haujlwm tsis cuam tshuam rau kev ua haujlwm ntawm lwm cov LEDs, thiab cov LEDs nrog qhov sib txawv loj tuaj yeem sib phim. Cov teeb meem tseem ceeb yog: cov qauv ntawm tag nrho cov tsav tsheb Circuit Court yog qhov nyuaj, tus nqi ntawm cov cuab yeej yog siab, thiab lub ntim ntim yog loj heev, uas tsis haum rau ntau lub LED circuits.
3. Cov ntawv sib xyaw
Daim ntawv hybrid yog npaj los ntawm kev sib txuas ntawm qhov zoo ntawm daim ntawv series thiab daim ntawv sib luag. Cov ntaub ntawv tseem ceeb yog raws li nram no.
3.1 Daim ntawv sib xyaw ua ntej thiab tom qab ntawd sib npaug
Thaum tus naj npawb ntawm cov LEDs siv loj, qhov yooj yim series lossis kev sib txuas ua ke yog qhov tsis muaj tseeb, vim tias yav dhau los xav kom tus neeg tsav tsheb tso tawm qhov hluav taws xob siab heev (n zaus qhov voltage VF ntawm ib qho LED), thaum tom kawg xav kom tus tsav tsheb tso tawm ib tam sim no loj (ib zaug LED n zaus IF tam sim no). Qhov no ua rau muaj teeb meem rau kev tsim thiab tsim cov neeg tsav tsheb, thiab tseem cuam tshuam txog cov teeb meem ntawm kev tsav tsheb thiab qhov teeb meem kev ua haujlwm tag nrho. Cov khoom nVE ntawm tus naj npawb ntawm LEDs txuas nrog hauv series thiab kev khiav hauj lwm voltage VF ntawm ib leeg LED txiav txim siab qhov tso zis voltage ntawm tus tsav tsheb; cov khoom ntawm tus naj npawb m ntawm parallel LED hlua thiab kev khiav hauj lwm tam sim no IF ntawm ib qho LED txiav txim siab cov zis tam sim no ntawm tus neeg tsav tsheb, thiab mIF * Tus nqi nVF txiav txim siab qhov tso zis hluav taws xob ntawm tus tsav tsheb.
Yog li ntawd, txoj kev sib xyaw ntawm cov hlua thiab tom qab ntawd ua ke yog qhov tseem ceeb kom ntseeg tau qee qhov kev ntseeg tau (qhov tsis ua haujlwm ntawm LED hauv txhua txoj hlua tsuas yog cuam tshuam rau lub teeb pom kev zoo ntawm txoj hlua feem ntau), thiab kom ntseeg tau tias qhov sib txuam nrog kev tsav tsheb (tus tsav tsheb tawm ib haum voltage), uas txhim kho kev ntseeg tau piv rau cov ntshiab series kev twb kev txuas. Tag nrho cov khoom siv hluav taws xob muaj cov yam ntxwv ntawm cov qauv yooj yim, kev sib txuas yooj yim thiab kev ua haujlwm siab, thiab tsim nyog rau kev siv nrog ntau tus LEDs.
3.2 Daim ntawv sib xyaw ua ke ntawm thawj zaug thiab tom qab ntawd serial
Ib daim ntawv sib xyaw ntawm ob peb LEDs nyob rau hauv parallel thiab tom qab ntawd hauv series. Txij li thaum LED1-n~LEDm-n txuas nrog ua ntej, kev ntseeg siab ntawm txhua pab pawg ntawm LEDs nyob rau hauv kev ua txhaum yog txhim kho, tab sis tam sim no kev sib koom teeb meem ntawm txhua pawg ntawm paralleled LEDs yog li ntawd tseem ceeb heev.
Txog rau qhov kawg no, nws tuaj yeem daws tau los ntawm kev xaiv khub, siv LEDs nrog tib lub zog ua haujlwm thiab tam sim no raws li ib pab pawg nyob rau hauv parallel, los yog txuas txhua LED hauv series nrog me me tam sim no sib koom resistor. Lwm cov yam ntxwv thiab cov teeb meem uas twb muaj lawm ntawm daim ntawv hybrid no zoo ib yam li cov koob thawj thiab tom qab ntawd sib txuas.
3.3 Cross Array Form
Daim ntawv hla-array feem ntau yog los txhim kho kev ntseeg siab ntawm LED ua haujlwm thiab txo qhov tsis ua haujlwm. Daim ntawv tseem ceeb yog: txhua txoj hlua yog tsim los ntawm 3 LEDs, uas txuas nrog rau Va, Vb, thiab Vc tso zis terminals ntawm tus tsav tsheb tso zis. Thaum tag nrho peb LEDs nyob rau hauv ib txoj hlua yog qhov qub, peb LEDs yuav teeb rau tib lub sijhawm; ib zaug ib los yog ob ntawm LEDs tsis qhib, tsawg kawg ib LED tuaj yeem lav tau ua haujlwm ib txwm. Nyob rau hauv txoj kev no, lub teeb pom kev ruaj ntseg ntawm txhua pawg ntawm LEDs tuaj yeem txhim kho tau zoo, thiab kev ntseeg tau ntawm tag nrho LED teeb pom kev zoo tuaj yeem txhim kho.
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