I-diode ekhipha ukukhanya, noma i-LED ngamafuphi, iyithuluzi le-semiconductor eliguqula amandla kagesi abe amandla okukhanya.Lapho i-current ethile eya phambili idlula epayipini, amandla angakhululwa ngendlela yokukhanya.Amandla okukhanya acishe alingane nomsinga oya phambili.Umbala okhanyayo uhlobene nempahla ye-tube.
Okokuqala, izici eziyinhloko ze-LED
(1) Amandla kagesi asebenzayo aphansi, futhi amanye adinga kuphela i-1.5-1.7V ukuze akhanyise ukukhanya;(2) Umsinga osebenzayo uncane, inani elijwayelekile licishe libe ngu-10mA;(3) Inezici ze-unidirectional conductive ezifana nama-diode ajwayelekile, kodwa indawo efile I-voltage iphakeme kancane;(4) Inezici ezifanayo zokuzinzisa i-voltage njenge-silicon zener diode;(5) Isikhathi sokuphendula siyashesha, isikhathi kusukela ekusetshenzisweni kwe-voltage kuya ekukhishweni kokukhanya yi-1-10ms kuphela, futhi imvamisa yokuphendula ingafinyelela ku-100Hz;ke impilo yesevisi yinde , Ngokuvamile kufika emahoreni angu-100,000 noma ngaphezulu.
Njengamanje, ama-diode akhipha ukukhanya asetshenziswa kakhulu ama-LED phosphorescent phosphor (GaP) abomvu futhi aluhlaza, anokwehla kwe-voltage eya phambili ye-VF = 2.3V;ama-LED e-phosphorescent arsenic phosphor (GaASP) abomvu, okwehla kwamandla kagesi angaphambili okuyi-VF = 1.5-1.7V;kanye nama-LED aphuzi naluhlaza okwesibhakabhaka asebenzisa i-silicon carbide nezinto zesafire, i-voltage eya phambili yehla VF = 6V.
Ngenxa yejika eliya phambili le-volt-ampere le-LED, isimelaphi esikhawulelayo samanje kufanele sixhunywe kuchungechunge ukuze kugwenywe ukushisa ishubhu.Kumjikelezo we-DC, ukumelana nomkhawulo wamanje R kungalinganiselwa kusetshenziswa ifomula elandelayo:
R = (E-VF) / IF
Kumasekhethi e-AC, ukumelana nomkhawulo wamanje ongu-R kungalinganiselwa ngefomula elandelayo: R = (e-VF) / 2IF, lapho u-e eyinani elisebenzayo le-voltage yokuphakelwa kwamandla ka-AC.
Okwesibili, ukuhlolwa kwama-diode akhipha ukukhanya
Uma kungekho thuluzi elikhethekile, i-LED ingabuye ilinganiswe nge-multimeter (lapha i-MF30 multimeter ithathwa njengesibonelo).Okokuqala, setha i-multimeter ibe yi-Rx1k noma i-Rx100, bese ukala ukumelana nokuya phambili nokuhlehla kwe-LED.Uma ukumelana nokuya phambili kungaphansi kuka-50kΩ, ukumelana nokuhlehla akupheli, okubonisa ukuthi ishubhu livamile.Uma zombili izikhombisi-ndlela eziya phambili nezihlehlayo zinguziro noma azinamkhawulo, noma amanani okumelana aya phambili nangemuva eseduze, kusho ukuthi ishubhu alisebenzi.
Khona-ke, kuyadingeka ukukala ukuphuma kokukhanya kwe-LED.Ngenxa yokuthi ukwehla kwamandla kagesi aya phambili kungaphezu kuka-1.5V, ayikwazi ukukalwa ngokuqondile nge-Rx1, Rx1O, Rx1k.Nakuba i-Rx1Ok isebenzisa ibhethri elingu-15V, ukumelana kwangaphakathi kuphezulu kakhulu, futhi ishubhu alikwazi ukuvulwa ukuze likhiphe ukukhanya.Nokho, indlela yamamitha aphindwe kabili ingasetshenziselwa ukuhlola.Ama-multimeters amabili axhunywe ochungechungeni futhi womabili abekwe endaweni ye-Rx1.Ngale ndlela, umthamo webhethri usuphelele ungu-3V kanti ukumelana okuphelele kwangaphakathi kungu-50Ω.Amandla asebenzayo anikezwe ku-L-print makhulu kuno-10mA, okwanele ukwenza ishubhu livule futhi likhiphe ukukhanya.Uma ishubhu lingakhanyi ngesikhathi sokuhlolwa, lokho kubonisa ukuthi ithubhu alisebenzi.
Ku-VF = 6V LED, ungasebenzisa elinye ibhethri elingu-6V kanye nokumelana nomkhawulo wamanje ukuze uhlolwe.
Isikhathi sokuthumela: Mar-19-2020
