Txhua txhua xyoo, LEDs siv ntau zog, lawv tau pib nquag siv los ua cov khoom siv hluav taws xob. Yog tias nws tau tsim nyog yuav tsum txuas ntawm tus kheej ntawm LED, qee qhov kev cai yuav tsum ua raws thaum ua tiav cov haujlwm no.
Nws yog qhov tsim nyog
- - multimeter (tester);
- - fais fab mov;
Cov Lus Qhia
Kauj ruam 1
Txhawm rau txuas LED, koj yuav tsum paub nws cov yam ntxwv. Feem ntau LED rau lub teeb rau 20mA tam sim no, qhov voltage nominal nyob ntawm qhov xim ntawm lub teeb. Rau cov LEDs liab thiab daj, qhov no yog 2 V (siv tau ntau yam 1, 8 - 2, 4 V). Txog rau xim dawb, ntsuab thiab xiav 3 V (3 - 3.5 V). Thaum sib txuas ntawm LED, nws yog ib qho tseem ceeb kom hloov kho cov kev siv tam sim no - 20 mA. Hauv qhov no, LED yuav ua haujlwm tau zoo rau ntau xyoo.
Kauj ruam 2
Ua ntej txuas cov LED, lub hwj huam mov yuav tsum xaiv. Yog li, yog tias rau dawb, ntsuab thiab xiav LEDs ob series-txuas ntiv tes-hom roj teeb rau 1.5 V yuav muab tag nrho ntawm 3 V, ces qhov yuav tsum tau muab cov voltage yuav tsum tsis txhob siab tshaj tus nqi siab ntawm 3.5 V. Tab sis yog tias koj tig liab lossis daj nrog ob lub roj teeb LED, nws yuav cia li hlawv tawm. Tias yog vim li cas coj mus rau lub luag haujlwm tseem ceeb rau txoj kev xaiv ntawm lub zog, nco ntsoov tias qhov hluav taws xob ntawm lub LED tsis tshaj qhov tso cai tus nqi.
Kauj ruam 3
Yog tias qhov voltage siab tshaj qhov xav tau ib qho, ib lub tshuab nqus roj yuav tsum muaj nyob hauv Circuit Court. Piv txwv li, koj xav txuas 2 V LED rau 9 lub zog muab hluav taws xob. Nws hloov tawm ib qho ntxiv 7 V. Txhawm rau tua lawv, siv cov qauv R = U / I, koj tuaj yeem txiav txim siab tias qhov xav tau tiv thaiv yog 7 V / 0, 02 A, lossis 350 Ohm …
Kauj ruam 4
Cov cua sov tau tsim tawm ntawm lub tshuab ziab hluav taws xob, yog li nws yuav tsum muaj lub zog xav tau. Laij nws siv tus qauv P = U * I. Peb hloov cov ntaub ntawv: 7 V * 0.02 A = 0.14 W. Qhov no txhais tau tias koj xav tau qhov resistor ntawm txog 0.2 W - nws yog qhov zoo dua rau kev nqa nrog qee cov npoo.
Kauj ruam 5
Thaum siv hluav taws xob LED, nws yog ib qho tseem ceeb hauv kev xaiv los xaiv qhov tam sim no tsis siab tshaj 20 mA. Txhawm rau ua qhov no, txuas lub tester rau hauv qhib Circuit Court thiab tshawb xyuas lub zog tam sim no. Yog tias nws qis dua qis dua 20 mA - piv txwv li 17-18, tom qab ntawv tso nws li ntawd. Cov LED yuav ci me ntsis qis dua, tab sis nws yuav ua haujlwm rau lub sijhawm ntev heev. Yog tias qhov tam sim no poob qis dua los yog siab dua, koj yuav tsum kho nws los ntawm kev hloov ntawm qhov tsis kam ntawm lub ntsuas ntxiv.
Kauj ruam 6
Ua tib zoo mloog rau lub polarity ntawm LED txuas, kev txuas tsis raug yuav ua rau nws puas. Cov anode txuas nrog txuas ntxiv ntawm lub hwj chim sib txuas, cov cathode rau qhov rho tawm. Ib qho chaw tiaj tiaj (txiav) yog ua rau sab ntawm cathode ntawm lub qhov muag LED. Tsis tas li ntawd, lub cathode muaj qhov kev coj luv luv.
Kauj Ruam 7
Yog tias koj xav muab lub zog lossis cov hlua hluav taws xob ntawm LED los ntawm AC qhov tseem ceeb, tom qab ntawd saib xyuas lub ntsuas hluav taws xob. Hauv qhov kev yoojyim, muaj ib qho diode nrog qhov hluav taws xob tawg ntawm tsawg kawg 400 V tuaj yeem suav nrog hauv Circuit Court.
