I-diode ekhupha ukukhanya, okanye i-LED ngokufutshane, sisixhobo se-semiconductor esiguqula amandla ombane kumandla okukhanya.Xa umjelo othile ohamba phambili udlula ityhubhu, amandla anokukhutshwa ngendlela yokukhanya.Ukukhanya okukhanyayo kuphantse kulingane nomsinga ohamba phambili.Umbala okhanyayo uhambelana nempahla yombhobho.
Okokuqala, iimpawu eziphambili ze-LED
(1) Umbane osebenzayo uphantsi, kwaye ezinye zifuna kuphela i-1.5-1.7V ukukhanyisa ukukhanya;(2) Umsinga osebenzayo uncinci, ixabiso eliqhelekileyo li malunga ne-10mA;(3) Ineempawu ze-unidirectional conductive ezifana ne-diode eziqhelekileyo, kodwa indawo efileyo I-voltage iphezulu kancinane;(4) Ineempawu ezifanayo zokuzinzisa amandla ombane njenge-silicon zener diode;(5) Ixesha lokuphendula likhawuleza, ixesha elivela kwisicelo sombane ukuya ekukhanyeni ukukhanya kuphela yi-1-10ms, kwaye i-frequency yokuphendula inokufikelela kwi-100Hz;ke ubomi benkonzo bude , Ngokuqhelekileyo ukuya kwiiyure ze-100,000 okanye ngaphezulu.
Okwangoku, ii-diode ezisetyenziswa ngokuqhelekileyo ezikhanyayo zibomvu kunye ne-green phosphorescent phosphor (GaP) LEDs, ezine-voltage yangaphambili ye-VF = 2.3V;ii-LED ze-phosphorescent arsenic phosphor (GaASP) ezibomvu, i-voltage yayo yangaphambili i-VF = 1.5-1.7V;kunye nee-LED ezityheli kunye nebhlowu zisebenzisa i-silicon carbide kunye nesafire izinto, i-voltage yangaphambili yehla VF = 6V.
Ngenxa yokunyuka kwe-volt-ampere ijika le-LED, i-resistor yokukhawulela okwangoku kufuneka idibaniswe kwi-series ukuphepha ukutshisa ityhubhu.Kwisekethe ye-DC, uxhathiso-mda lwangoku R lunokuqikelelwa kusetyenziswa le fomula ilandelayo:
R = (E-VF) / IF
Kwiisekethe ze-AC, ukuchasana kokukhawulelana kwangoku-R kunokuqikelelwa ngolu hlobo lulandelayo: R = (e-VF) / 2IF, apho i-e ixabiso elisebenzayo lombane wombane we-AC.
Okwesibini, uvavanyo lweediode ezikhupha ukukhanya
Kwimeko yokungabikho kwesixhobo esikhethekileyo, i-LED inokuqikelelwa kwakhona nge-multimeter (apha i-MF30 multimeter ithathwa njengomzekelo).Okokuqala, seta i-multimeter kwi-Rx1k okanye i-Rx100, kwaye ulinganise ukuxhathisa kwangaphambili kunye nokubuyisela umva kwe-LED.Ukuba ukuchasana kwangaphambili kungaphantsi kwe-50kΩ, ukuchasana kwe-reverse akunasiphelo, kubonisa ukuba ityhubhu iyinto eqhelekileyo.Ukuba zombini umkhomba-ndlela wangaphambili kunye no-reverse u-zero okanye awunasiphelo, okanye amaxabiso okumelana nangaphambili kunye nokubuyisela umva asondele, oko kuthetha ukuba ityhubhu inesiphene.
Emva koko, kuyimfuneko ukulinganisa ukukhutshwa kokukhanya kwe-LED.Ngenxa yokuba ukuhla kwamandla ombane angaphambili kungaphezulu kwe-1.5V, ayinakulinganiswa ngokuthe ngqo nge-Rx1, i-Rx1O, i-Rx1k.Nangona i-Rx1Ok isebenzisa ibhetri ye-15V, ukuchasana kwangaphakathi kuphezulu kakhulu, kwaye ityhubhu ayikwazi ukuvulwa ukuze ikhuphe ukukhanya.Nangona kunjalo, indlela yemitha ephindwe kabini ingasetyenziselwa uvavanyo.Ii-multimeters ezimbini zixhunyiwe kuchungechunge kwaye zombini zibekwe kwindawo ye-Rx1.Ngale ndlela, i-voltage iyonke yebhetri yi-3V kwaye ukuchasana kwangaphakathi okupheleleyo yi-50Ω.Umbane osebenzayo onikezelweyo kwi-L-print mkhulu kune-10mA, eyaneleyo ukwenza ityhubhu ivule kwaye ikhuphe ukukhanya.Ukuba ityhubhu ayikhanyi ngexesha lovavanyo, ibonisa ukuba ityhubhu inesiphako.
I-VF = i-6V LED, ungasebenzisa enye ibhetri ye-6V kunye ne-resistor yokunciphisa yangoku yokuvavanya.
Ixesha lokuposa: Mar-19-2020
