Siv AC Nrog LEDs (Ntu 3) - Lub Teeb Loj: 6 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:31

Hauv Kev Siv AC nrog LEDs, ntu 1 thiab ntu 2, peb tau saib txoj hauv kev los hloov AC lub zog rau LEDs yam tsis hloov pauv ib txwm rau DC dawb huv ua ntej. Ntawm no, hauv ntu 3, peb suav nrog qhov peb tau kawm ua ntej los teeb lub teeb LED uas ua haujlwm Kev ceeb toom ncaj qha tawm AC lub ntsiab lus ceeb toom: AC lub hauv paus yog ntau pua volts, thiab muaj peev xwm ua rau tuag taus. Thov ua txhua qhov kev tiv thaiv tsim nyog ua ntej koj pib ua haujlwm nrog nws!

Kauj Ruam 1: Tus Tsis Siv Hluav Taws Xob Transformer

Thaum peb txuas LEDs rau AC hloov pauv, kev suav peb siv yog: Vac / 3.3 kom muab tus lej LEDs rau peb peb yuav tsum muaj peev xwm tswj tau lub zog kom raug yam tsis muaj cov tshuaj tiv thaiv ntxiv thiab lwm qhov. AC lub zog? Hauv qee txoj hauv kev nws yooj yim dua - qhov hluav taws xob los ntawm kev hloov pauv tuaj yeem sib txawv heev nrog lub nra peb tso rau nws, qhov AC lub zog tseem ruaj khov dua yog tias peb siv 110v tus qauv hauv Asmeskas, peb xub xam qhov siab tshaj qhov siab, 1.4 * 110 = 156 thiab peb tuaj yeem pom tus naj npawb ntawm LEDs nws tuaj yeem txhawb nqa: 156 / 3.3 = 47 LEDs Yog li, puas yog txhais tau tias yog tias peb tso 47 LEDs ua ke, peb tuaj yeem khiav tag nrho txoj hlua ncaj qha tawm ntawm 110v AC qhov ntsaws? ! Tsuav peb tswj hwm qhov hluav taws xob hla txhua qhov LED ntawm 3.5v lossis tsawg dua, nws yuav ua haujlwm nyob rau hauv nws qhov txwv. Tab sis tom qab ntawd, peb tsis txhob hnov qab tias rau txhua lub voj voog zoo, muaj lub voj voog tsis zoo! Qhov ntawd txhais tau tias peb xav tau daim iav Circuit Court zoo li hauv (1). Wow, qhov ntawd yog qhov phem heev ntawm qhov muag teev! Lub 1N4003 muaj peev xwm tuav 200 volts yog li zoo rau Asmeskas lub zog. Rau EU lub tebchaws, tus lej khawv koob yog 103 LEDs (ob npaug yog tias koj xav siv ob qho tib si) thiab diode rau ckt (2) yuav tsum yog 1N4004 lossis zoo dua.

Kauj ruam 2: Thawb lub hnab ntawv

Nco ntsoov tias, vim tias peb tab tom siv lub diode los thaiv ib nrab ntawm peb lub voj voog, LEDs hauv Circuit (2) tsuas yog ua haujlwm 1/2 lub sijhawm. Peb yuav ua li cas thiaj ua rau lawv ci rau lwm ib nrab thiab?

Nrog ib feem yooj yim hu ua Choj Rectifier qhov no tuaj yeem tshwm sim. Cov cuab yeej no yog qhov tseeb 4 diodes txuas nrog hauv txoj kev hla hla kom ua rau ob txoj kev mus tib yam nkaus. Cov kiv cua hauv tshuab hluav taws xob yuav paub qhov no yog ib feem ntawm 'Kev hloov kho puv nthwv dej' Circuit (tsis zoo li ib nrab nthwv dej). Nrog qhov ntxiv no, peb cov LEDs yuav tig ob zaug ntau dua thiab peb yuav tau txais lub teeb ntau dua ob zaug los ntawm lawv.

Kauj ruam 3: Tsim Sijhawm

Yog li, peb tuaj yeem pib tsim peb qhov yooj yim tag nrho-LED + tus choj txuas kom khiav tawm 110v lub ntsiab.

Koj yuav xav tau: Ntau ntau LEDs dawb - ib txwm! Thiab Kuaj lawv txhua tus! AC kab qaum Perfboard 1N4003 diode lossis 200volt choj rectifier Thawj daim duab yog qhov kuv pom zoo li cas thaum ua tiav. Qhov muag ceev yuav nco ntsoov tias tsuas muaj 42 LEDs ntawm lub nkoj. Vim tias yuav tsum tau nyob nrog tus choj ntawm lub rooj tsavxwm, thiab vim tias muaj qhov ruaj khov ntawm peb lub ntsiab lus, peb tuaj yeem khiav peb lub teeb ntau dua 20mA. Tus Choj muaj 4 tus coj: 2 cim (~), a (+) zoo thiab (-) tsis zoo. Cov (~) cov mus rau AC Mains. Pib los ntawm kev txuas Tus Choj (+) mus rau qhov ntev dua (+) cov thawj ntawm LED, tom qab ntawd siv cov hlau lead luv rau cov hlau lead ntev ntawm LED tom ntej. Ua 1 kab, ob npaug thiab triple kos ua ntej soldering! Ua haujlwm koj txoj hauv kev, ib txwm txuas luv dua mus ntev dua. Kuv muaj cov duab ntxiv hauv qab no qhia txog ntau theem ntawm kev ua tiav. Luam tawm lawv los pab koj ua cov thaiv.

Kauj ruam 4: Saib seb

Thiab muaj qhov kaj! Vim tias qhov xwm txheej txaus ntshai ntawm cov khoom siv thaum ntsaws, Kuv tau npog lub rooj tsav xwm txheej nrog txheej peb npaug ntawm daim ntawv parchment, uas muaj tus nqi hluav taws xob zoo, thiab tuaj yeem tiv taus 400F ntawm tshav kub. Tom qab ntawd kuv tau teeb tsa lub rooj tsavxwm ntawm lub hau ntawm lub thawv nqa tawm, siv lub tshuab ua npuas dej los ntawm DVD ntxaiv, nrog txiav tawm rau lub hwj chim qaum. Lub teeb tso tawm yog sib npaug rau 40-watt frosted bulb, tab sis lub thawv tsis tshua sov. Nco ntsoov: Ib txwm tshem tawm lub Circuit Court ua ntej koj kov ib qho twg raug. Tsis tas li, cov LEDs yuav tau khiav ze rau lawv qhov ntsuas tam sim no, uas tuaj yeem txhais tau tias sov li 85C ntawm lawv qhov chaw.

Kauj ruam 5: Variations

Koj puas tuaj yeem sib txuas ua ke (2) thiab (3) muab peb lub teeb rau Hi/Lo hloov. Nyob zoo, qhov hloov luv luv diode kom nws ua haujlwm nyob rau hauv puv nthwv hom zoo li hauv (3). Qhib qhov hloov pauv tsuas yog tso cai rau tam sim no ntws ib nrab lub sijhawm, ib yam li (2). Ozzies thiab Brits: Koj ib yam tuaj yeem siv 42/47 LED cov hluav taws xob - tsuas yog ua ke US version (.4uF thiab 1K -ohm) Circuit qhia hauv ib feem 2 thiab koj ib yam tuaj yeem ua hluav taws xob AC nrog tsuas yog 42 LEDs! Los yog txheeb xyuas qhov kev suav hauv cov kauj ruam hauv qab no. Oh yog, peb lub teeb 'loj' yog qhov muaj txiaj ntsig zoo-khiav tawm 110-volt mains, nws tsis tshua siv 3-watts. Find out txog ntau txoj hauv kev kom pom koj lub tsev nrog LEDs tawm A/ C mains ntawm no!

Kauj Ruam 6: Crunching Numbers

Nov yog qhov rov ua dua ntawm kev suav uas siv rau txoj haujlwm no: Txhawm rau ua haujlwm LEDs dawb (lub npe hluav taws xob 3.3v) muaj kev nyab xeeb tawm AC Mains yam tsis siv txoj cai (tsis yog choj diode), tus lej khawv koob yog: Vac * 1.4 / 3.3. Uas yog tus lej tsawg kawg ntawm LEDs hauv kab ntawv uas yuav khiav tawm AC yam tsis muaj ntau tshaj li qhov nws nyiam ua haujlwm. Qhov xaiv LEDs tuaj yeem yog 20mA lossis siab dua - AS LONG AS lawv yog txhua yam tib yam thiab txuas hauv kab ntawv. tsis pub tsawg dua 30), peb yuav tsum ntxiv qhov hluav taws xob poob RC ua ke. R yog ib txwm 1K, 1Watt resistor, thaum tus nqi ntawm C yog xam raws li: Vpk = Vac * 1.4Vdd = N * 3.3, qhov twg N yog tus naj npawb ntawm cov dawb LEDs peb xav siv hauv series. Iled = 0.02, tam sim no peb xav tau rau peb cov LEDs. C = 1 / (2 * pi * f * (Vpk-Vdd) / Iled), qhov twg f yog qhov siv hluav taws xob ntau zaus, tab sis koj tuaj yeem yooj yim rau: (58 / (Vpk-Vdd)) hauv micro-farads (uF), thiab yuav tsum nyob nruab nrab ntawm.1 thiab.5 uF. TSEEM CEEB: Cov khoom yuav tsum raug ntsuas kom tsawg kawg Vpk, thiab tam sim no txaus los lis Iled.