Diode yotulutsa kuwala, kapena LED mwachidule, ndi chipangizo cha semiconductor chomwe chimasintha mphamvu yamagetsi kukhala mphamvu yowunikira.Pamene mphamvu ina ya kutsogolo ikudutsa mu chubu, mphamvuyo imatha kumasulidwa ngati kuwala.Kuwala kowala kumakhala kolingana ndi kutsogolo kwapano.Mtundu wowala umagwirizana ndi zinthu za chubu.
Choyamba, chachikulu makhalidwe a LED
(1) Magetsi ogwira ntchito ndi otsika, ndipo ena amangofunika 1.5-1.7V kuti atsegule;(2) Mphamvu yogwira ntchito ndi yaying'ono, mtengo wake ndi pafupifupi 10mA;(3) Ili ndi mawonekedwe a unidirectional conductive ofanana ndi ma diode wamba, koma zone yakufa Mphamvu ndi yokwera pang'ono;(4) Ili ndi mawonekedwe okhazikika amagetsi ngati ma silicon zener diode;(5) Nthawi yoyankha ndi yofulumira, nthawi yochokera kumagetsi ogwiritsira ntchito magetsi mpaka kutulutsa kuwala ndi 1-10ms yokha, ndipo maulendo oyankha amatha kufika 100Hz;ndiye moyo wautumiki ndi wautali , Nthawi zambiri mpaka maola 100,000 kapena kupitilira apo.
Pakalipano, ma diode omwe amagwiritsidwa ntchito kawirikawiri ndi ma LED ofiira ndi obiriwira a phosphorescent phosphor (GaP), omwe ali ndi kutsogolo kwa VF = 2.3V;ma LED ofiira a phosphorescent arsenic phosphor (GaASP), omwe kutsogolo kwake kutsika ndi VF = 1.5-1.7V;ndi ma LED achikasu ndi abuluu omwe amagwiritsa ntchito silicon carbide ndi safiro, kutsika kwamagetsi kutsogolo VF = 6V.
Chifukwa cha phirilo lakutsogolo la volt-ampere la LED, chotchinga choletsa pakali pano chiyenera kulumikizidwa motsatizana kuti zisawotche chubu.Mudera la DC, kukana kwapakali pano R kumatha kuyerekezedwa pogwiritsa ntchito njira iyi:
R = (E-VF) / IF
M'mabwalo a AC, kukana kwapakali pano kwa R kumatha kuyerekezedwa ndi njira iyi: R = (e-VF) / 2IF, pomwe e ndiye phindu lamagetsi amagetsi a AC.
Chachiwiri, kuyesa kwa ma diode otulutsa kuwala
Ngati palibe chida chapadera, LED imathanso kuwerengedwa ndi multimeter (pano MF30 multimeter imatengedwa mwachitsanzo).Choyamba, ikani multimeter kukhala Rx1k kapena Rx100, ndikuyesa kutsogolo ndi kumbuyo kukana kwa LED.Ngati kukana kwapatsogolo kuli kochepera 50kΩ, kukana kobwerera kulibe malire, zomwe zikuwonetsa kuti chubu ndichabwinobwino.Ngati mayendedwe onse akutsogolo ndi obwerera kumbuyo ali ziro kapena opanda malire, kapena kukana kutsogolo ndi kumbuyo kuli pafupi, zikutanthauza kuti chubu ndi cholakwika.
Kenako, ndikofunikira kuyeza kutulutsa kwa kuwala kwa LED.Chifukwa kutsika kwake kwamagetsi akutsogolo kuli pamwamba pa 1.5V, sikungayesedwe mwachindunji ndi Rx1, Rx1O, Rx1k.Ngakhale Rx1Ok imagwiritsa ntchito batire ya 15V, kukana kwamkati ndikokwera kwambiri, ndipo chubu sichingayatsidwe kuti chitulutse kuwala.Komabe, njira ya mita iwiri ingagwiritsidwe ntchito poyesa.Ma multimeter awiri amalumikizidwa mndandanda ndipo onse amayikidwa mu Rx1 malo.Mwanjira iyi, mphamvu yonse ya batri ndi 3V ndipo kukana kwathunthu kwamkati ndi 50Ω.Kugwira ntchito komwe kumaperekedwa ku L-print ndikokulirapo kuposa 10mA, zomwe ndizokwanira kuti chubu chiyatse ndikutulutsa kuwala.Ngati chubu sichiwala panthawi yoyesera, zimasonyeza kuti chubucho chili ndi vuto.
Kwa VF = 6V LED, mutha kugwiritsa ntchito batire lina la 6V ndi choletsa choletsa chapano poyesa.
Nthawi yotumiza: Mar-19-2020
