Lub teeb-emitting diode, lossis LED luv luv, yog ib qho khoom siv hluav taws xob uas hloov hluav taws xob rau hauv lub teeb lub zog.Thaum muaj qee yam tam sim no dhau los ntawm lub raj, lub zog tuaj yeem tso tawm hauv daim ntawv ntawm lub teeb.Lub luminous siv yog kwv yees proportional rau pem hauv ntej tam sim no.Cov xim luminous muaj feem xyuam rau cov khoom siv ntawm lub raj.
Ua ntej, cov yam ntxwv tseem ceeb ntawm LED
(1) Kev ua haujlwm voltage tsawg, thiab qee qhov tsuas yog xav tau 1.5-1.7V los qhib lub teeb;(2) Tam sim no ua haujlwm me me, tus nqi raug yog li 10mA;(3) Nws muaj unidirectional conductive yam ntxwv zoo ib yam li cov diodes zoo tib yam, tab sis qhov chaw tuag Qhov voltage yog me ntsis siab dua;(4) Nws muaj cov yam ntxwv zoo sib xws ntawm kev ruaj ntseg zoo li silicon zener diodes;(5) Lub sij hawm teb ceev ceev, lub sij hawm los ntawm voltage daim ntawv thov mus rau lub teeb emission tsuas yog 1-10ms, thiab cov lus teb zaus tuaj yeem ncav cuag 100Hz;ces lub neej ua haujlwm ntev, Feem ntau mus txog 100,000 teev lossis ntau dua.
Tam sim no, feem ntau siv lub teeb-emitting diodes yog liab thiab ntsuab phosphorescent phosphor (GaP) LEDs, uas muaj ib tug pem hauv ntej voltage poob ntawm VF = 2.3V;liab phosphorescent arsenic phosphor (GaASP) LEDs, uas nws pem hauv ntej voltage poob yog VF = 1.5-1.7V;thiab rau daj thiab xiav LEDs siv silicon carbide thiab sapphire cov ntaub ntawv, lub pem hauv ntej voltage poob VF = 6V.
Vim yog qhov taw qhia rau pem hauv ntej volt-ampere nkhaus ntawm LED, tam sim no-txheej resistor yuav tsum tau txuas nrog hauv cov koob kom tsis txhob hlawv lub raj.Hauv DC Circuit Court, qhov tam sim no-txhim kho R tuaj yeem kwv yees siv cov qauv hauv qab no:
R = (E-VF) / IB
Nyob rau hauv AC circuits, qhov tam sim no-limiting tsis kam R tuaj yeem kwv yees los ntawm cov qauv hauv qab no: R = (e-VF) / 2IF, qhov twg e yog tus nqi zoo ntawm AC fais fab mov voltage.
Qhov thib ob, qhov kev sim ntawm lub teeb-emitting diodes
Nyob rau hauv cov ntaub ntawv ntawm tsis muaj tshwj xeeb ntsuas, LED kuj yuav kwv yees los ntawm ib tug multimeter (ntawm no MF30 multimeter yog coj los ua piv txwv).Ua ntej, teem lub multimeter rau Rx1k los yog Rx100, thiab ntsuas lub pem hauv ntej thiab rov qab tsis kam ntawm LED.Yog tias qhov kev tiv thaiv pem hauv ntej tsawg dua 50kΩ, qhov rov qab ua haujlwm tsis muaj qhov kawg, qhia tias lub raj yog qhov qub.Yog hais tias ob qho tib si rau pem hauv ntej thiab thim rov qab cov lus qhia yog xoom los yog infinite, los yog qhov tseem ceeb rau pem hauv ntej thiab rov qab kuj nyob ze, nws txhais tau hais tias lub raj yog puas.
Tom qab ntawd, yuav tsum ntsuas lub teeb emission ntawm LED.Vim tias nws qhov hluav taws xob poob qis dua 1.5V, nws tsis tuaj yeem ntsuas ncaj qha nrog Rx1, Rx1O, Rx1k.Txawm hais tias Rx1Ok siv lub roj teeb 15V, qhov kev tiv thaiv sab hauv siab dhau lawm, thiab lub raj tsis tuaj yeem tig rau kom tawm lub teeb.Txawm li cas los xij, txoj kev ntsuas ob npaug tuaj yeem siv rau kev sim.Ob lub multimeters txuas nrog hauv koob thiab ob qho tib si muab tso rau hauv Rx1 txoj haujlwm.Nyob rau hauv txoj kev no, tag nrho cov roj teeb voltage yog 3V thiab tag nrho cov sab hauv kuj yog 50Ω.Qhov ua haujlwm tam sim no muab rau L-print yog ntau dua 10mA, uas yog txaus los ua kom lub raj tig rau thiab tawm lub teeb.Yog hais tias lub raj tsis ci thaum lub sij hawm kuaj, nws qhia tau hais tias lub raj tsis zoo.
Rau VF = 6V LED, koj tuaj yeem siv lwm 6V roj teeb thiab tam sim no limiting resistor rau kev sim.
Post lub sij hawm: Mar-19-2020
