Meanwell Tsav Tsheb: Lub zog tsim hluav taws xob tas li ntawm LED Tsav Tsheb
Tsis ntev los no, ib qho ntawm cov ncauj lus nrov tshaj plaws hauv kev lag luam LED fais fab yog lub zog tas li ntawm LED. Vim li cas LEDs yuav tsum tau tsav los ntawm qhov tam sim no tsis tu ncua? Vim li cas lawv tsis tuaj yeem tsav los ntawm lub zog tas li? Ua ntej sib tham txog qhov teeb meem no, peb yuav tsum xub nkag siab tias vim li cas LED yuav tsum tau tsav los ntawm qhov tam sim no tas li. Raws li tau piav qhia los ntawm daim duab LED nkhaus, thaum lub zog pem hauv ntej ntawm LED hloov los ntawm 2.5%, tam sim no los ntawm LED yuav hloov li ntawm 16%, thiab qhov hluav taws xob pem hauv ntej ntawm LED tau yooj yim cuam tshuam los ntawm qhov kub thiab txias. Qhov kub thiab txias sib txawv ntawm qhov kub thiab txias yuav ua rau hluav taws xob. Qhov sib txawv voltage yog tshaj 20%. Tsis tas li ntawd, qhov ci ntawm LED yog proportional rau pem hauv ntej tam sim no ntawm LED. Qhov sib txawv tam sim no ntau dhau yuav ua rau muaj qhov ci ntsa iab ntau dhau, yog li LED yuav tsum tau tsav los ntawm qhov tam sim no tsis tu ncua. Txawm li cas los xij, lub zog hluav taws xob tas li tuaj yeem siv rau LED? Ua ntej, qhov teeb meem ntawm seb lub zog tas li yog sib npaug rau qhov ci ntsa iab tas li yog tham. Los ntawm qhov pom ntawm qhov yooj yim sib tham txog kev tsim ntawm tus tsav lub zog tas li, qhov kev hloov ntawm LED thiab kub nkhaus zoo li ua tau. Vim li cas ho tsis cov chaw tsim khoom ntawm LED tsav tsheb ncaj qha tsim tus tsav lub zog tas li? Muaj ntau qhov laj thawj cuam tshuam. Nws tsis yooj yim los tsim lub zog hluav taws xob tsis tu ncua. Nws yog qhov yooj yim heev los siv MCU (Micro Controller Unit) txhawm rau txheeb xyuas qhov tso zis hluav taws xob thiab tam sim no, tswj lub sijhawm lub luag haujlwm ntawm PWM (Pulse Width Modulation) los ntawm kev suav cov kev pabcuam, thiab tswj cov zis hluav taws xob ntawm lub zog xiav lub zog nkhaus ntawm daim duab. . Kev tso tawm hluav taws xob tas li tuaj yeem ua tiav, tab sis txoj kev no ua rau ntau tus nqi, thiab thaum lub sij hawm luv luv ntawm kev puas tsuaj tshwm sim, lub zog tas li LED tsav tsheb yuav nce qhov tam sim no vim qhov kev tshawb pom ntawm qhov hluav taws xob qis, uas yuav ua rau muaj kev puas tsuaj ntau dua. Tsis tas li ntawd, tus yam ntxwv kub ntawm LED yog qhov kub tsis zoo coefficient. Thaum qhov kub thiab txias siab dua, peb cia siab tias yuav txo cov zis tam sim no kom tswj tau qhov kev ua tau zoo ntawm lub neej ntev ntawm LED. Txawm li cas los xij, txoj kev siv hluav taws xob tas li tsis sib haum nrog qhov kev xav no. Nyob rau hauv qhov kub thiab txias daim ntawv thov ntawm LED, cov zis tam sim no ntawm LED tsav tsheb yog nce vim yog nrhiav tau ntawm tsawg voltage. Xav txog txhua yam saum toj no, nws yog qhov kev daws teeb meem zoo tshaj plaws los muab cov neeg siv khoom nrog "quasi-constant power" LED tsav tsheb nrog ntau qhov voltage / tam sim no tso zis.
Lub zog tas li LED tsav tsheb uas tau sau los ntawm qee cov khoom ntawm Meanwell siv hom kev siv hluav taws xob tas mus li kev tsim kho tshwj xeeb. Lub hom phiaj yog muab cov neeg siv khoom nrog ntau yam ntawm qhov hluav taws xob / tam sim no tso zis quasi-constant power LED tsav tsheb. Nws tuaj yeem tsis tsuas yog coj mus rau hauv tus account cov kev xav tau ntawm cov neeg siv thiab zam kom tsis txhob muaj tus nqi nce los ntawm kev tsim ntau dhau los yog teeb meem tshwm sim los ntawm cov yam ntxwv ntawm LED, tab sis kuj ua rau lub teeb tsis ua haujlwm thiab muab quasi-constant. Kev tsim ntau yam ntawm cov khoom siv fais fab tuaj yeem hais tau tias yog qhov kev daws teeb meem zoo tshaj plaws ntawm LED tsav lub zog hluav taws xob ntawm kev ua lag luam tam sim no.