Diode iftiin-bixiya, ama LED-ga oo gaaban, waa aalad semiconductor ah oo tamarta korontada u beddesha tamarta iftiinka.Marka qayb hore oo hore ah ay soo dhex marto tuubada, tamarta waxaa lagu sii dayn karaa qaab iftiin ah.Xoogga iftiinka iftiinka ayaa qiyaastii la mid ah kan hadda socda.Midabka iftiinka wuxuu la xiriiraa walxaha tuubada.
Marka hore, sifooyinka ugu muhiimsan ee LED
(1) Korantada shaqadu waa yar tahay, qaarna waxay u baahan yihiin oo kaliya 1.5-1.7V si ay u shidaan iftiinka;(2) hadda shaqeeyaa waa yar yahay, qiimaha caadiga ah waa qiyaastii 10mA;(3) Waxay leedahay sifooyin dhaq-dhaqaaq aan jiho lahayn oo la mid ah diode-yada caadiga ah, laakiin aagga dhintay danabku wax yar ayuu ka sarreeyaa;(4) Waxay leedahay sifooyin xasilinta danab oo la mid ah sida silikoon zener diodes;(5) Waqtiga jawaabtu waa dhakhso, wakhtiga laga bilaabo codsiga danab ilaa iftiinka iftiinka waa 1-10ms kaliya, iyo inta jeer ee jawaabta waxay gaari kartaa 100Hz;markaa nolosha adeeggu waa dheer tahay , Guud ahaan ilaa 100,000 saacadood ama ka badan.
Waqtigan xaadirka ah, dareerayaasha iftiinka soo saara ee sida caadiga ah loo isticmaalo waa guduudan iyo cagaar phosphorescent phosphor (GaP) LEDs, kuwaas oo leh hoos u dhac hore oo VF ah = 2.3V;Fosfoorescent arsenic phosphor (GaASP) LEDs, kuwaas oo hoos u dhaca danab hore waa VF = 1.5-1.7V;iyo LED-yada jaalaha iyo buluuga ah ee isticmaalaya carbide silicon iyo sapphire, hoos u dhaca danabka hore VF = 6V.
Iyada oo ay ugu wacan tahay qalooca volt-ampere ee hore ee LED-ka, iska caabiyaha xaddidaya hadda waa in lagu xidhaa si taxane ah si looga fogaado gubashada tuubada.Wareegga DC, iska caabbinta xaddidan ee hadda jirta R ayaa lagu qiyaasi karaa iyadoo la adeegsanayo qaacidooyinka soo socda:
R = (E-VF) / HADDII
Wareegyada AC, caabbinta xaddidan ee hadda jirta R waxaa lagu qiyaasi karaa qaacidooyinka soo socda: R = (e-VF) / 2IF, halkaasoo e ay tahay qiimaha waxtarka leh ee korantada korontada AC.
Marka labaad, tijaabinta diodes-ka iftiinka
Haddii aysan jirin qalab gaar ah, LED-ka waxaa sidoo kale lagu qiyaasi karaa multimeter (halkan MF30 multimeter ayaa loo qaataa tusaale ahaan).Marka hore, samee multimeter-ka Rx1k ama Rx100, oo cabbir caabbinta hore iyo gadaal ee LED-ka.Haddii caabbinta hore ay ka yar tahay 50kΩ, iska caabbinta gadaasha waa mid aan dhammaad lahayn, taas oo muujinaysa in tuubada ay caadi tahay.Haddii labada jihooyinka hore iyo kuwa gadaalba ay yihiin eber ama aan xad lahayn, ama hore iyo qiimaha caabbinta horeba waa u dhow yihiin, waxay la macno tahay in tuubada cilladaysan tahay.
Kadibna, waa lagama maarmaan in la cabbiro iftiinka iftiinka LED-ka.Sababtoo ah hoos u dhaca danabtiisa hore ayaa ka sarreeya 1.5V, si toos ah looguma cabbiri karo Rx1, Rx1O, Rx1k.In kasta oo Rx1Ok uu isticmaalo batari 15V ah, iska caabbinta guduhu aad bay u saraysaa, tuubadana lama shidi karo si ay iftiin u bixiso.Si kastaba ha ahaatee, habka laba mitir ayaa loo isticmaali karaa baaritaanka.Laba mitir oo kala duwan ayaa si isdaba joog ah ugu xidhan labadoodaba waxa la dhigayaa booska Rx1.Sidan, wadarta korantada baytarigu waa 3V wadarta iska caabbinta gudahana waa 50Ω.Hadda shaqaynaysa ee la siinayo daabacaadda L-da ayaa ka weyn 10mA, taas oo ku filan in ay tuubbadu shidto oo iftiimiso.Haddii tuubbadu aysan dhalaalin inta lagu jiro baaritaanka, waxay muujineysaa in tuubada ay cilladaysan tahay.
VF = 6V LED, waxaad u isticmaali kartaa batari 6V kale ah iyo iska caabiyaha xaddidaya hadda.
Waqtiga boostada: Mar-19-2020
