Njalo uma sixhumana namakhasimende, kukhulunywa ngegama elilodwa ngokuphindaphindiwe: iwaranti. Ikhasimende ngalinye lifuna isikhathi sewaranti esihlukile, kusukela eminyakeni emibili kuya kwemithathu, kanti abanye bafuna iminyaka emihlanu.
Kodwa empeleni, ezimweni eziningi, amakhasimende ngokwawo angase angazi ukuthi lesi sikhathi sewaranti sitholakala kuphi, noma alandela nje isixuku futhi acabange ukuthi ama-LED kufanele aqinisekiswe isikhathi eside kangaka.
Namuhla, ngizokuhambisa ezweni le-LED ukuze uthole ukuthi impilo yezibani ichazwa futhi yahlulelwa kanjani.
Okokuqala, uma kukhulunywa ngama-LED, ngokubukeka kwawo, singabona ngokushesha ukuthi ahlukile emithonjeni yokukhanya yendabuko, ngoba cishe wonke ama-LED anesici esihlukile -isinki yokushisa.
Izibani zokushisa ezahlukahlukene azihloselwe ubuhle bezibani ze-LED, kodwa ukuze zenze ama-LED asebenze kangcono.
Khona-ke amakhasimende azozibuza ukuthi kungani imithombo yokukhanya yangaphambilini yayingavamile ukusebenzisa ama-radiator, kodwa enkathini ye-LED cishe zonke izibani zisebenzisa ama-radiator?
Ngoba imithombo yokukhanya yangaphambilini yayithembele emisebeni yokushisa ukuze ikhiphe ukukhanya, njengezibani ze-tungsten filament, ezithembele ekushiseni ukuze zikhiphe ukukhanya, ngakho-ke azikwesabi ukushisa. Isakhiwo esiyisisekelo se-LED yi-semiconductor PN junction. Uma izinga lokushisa liphakeme kancane, ukusebenza komsebenzi kuzoncipha, ngakho-ke ukushabalaliswa kokushisa kubaluleke kakhulu ku-LED.
Okokuqala, ake sibheke ukwakheka kanye nomdwebo we-schematic we-LED
Amathiphu: I-chip ye-LED izokhiqiza ukushisa lapho isebenza. Sibhekisela ekushiseni kwe-PN junction yayo yangaphakathi njengokushisa kwe-junction (Tj).
Futhi, okubaluleke kakhulu, impilo yezibani ze-LED ihlobene kakhulu nokushisa kwe-junction.
Umqondo okudingeka siwuqonde: Uma sikhuluma ngokuphila kwe-LED, akusho ukuthi ayinakusetshenziswa nhlobo, kodwa lapho ukukhanya kwe-LED kufinyelela ku-70%, ngokuvamile sicabanga ukuthi 'ukuphila kwayo sekuphelile'.
Njengoba kungabonakala esithombeni esingenhla, uma izinga lokushisa le-junction lilawulwa ku-105°C, khona-ke ukukhanya kwe-fluminous kwesibani se-LED kuzoncipha ku-70% uma isibani se-LED sisetshenziswa cishe amahora ayi-10,000; futhi uma izinga lokushisa le-junction lilawulwa cishe ku-60°C, khona-ke isikhathi salo sokusebenza sizoba cishe amahora ayi-100,000 + ihora, ukukhanya kwe-fluminous kuzoncipha ku-70%. Ukuphila kwesibani kukhushulwa izikhathi eziyi-10.
Empilweni yansuku zonke, esivame ukuhlangana nakho ukuthi isikhathi sokuphila kwe-LED singamahora angu-50,000, empeleni okuyidatha lapho izinga lokushisa le-junction lilawulwa ku-85°C.
Njengoba izinga lokushisa le-junction lidlala indima ebaluleke kangaka empilweni yezibani ze-LED, ungalinciphisa kanjani izinga lokushisa le-junction? Ungakhathazeki, ake siqale sibheke ukuthi isibani siqeda kanjani ukushisa. Ngemva kokuqonda indlela yokushabalalisa ukushisa, uzokwazi ngokwemvelo ukuthi ungalinciphisa kanjani izinga lokushisa le-junction.
Izibani ziqeda kanjani ukushisa?
Okokuqala, udinga ukwazi izindlela ezintathu eziyisisekelo zokudlulisa ukushisa: ukuhanjiswa komoya, ukuhanjiswa komoya, kanye nemisebe.
Izindlela eziyinhloko zokudlulisa i-radiator ukushabalalisa ukushisa komoya kanye nokushisa komoya, kanye nokushabalalisa ukushisa kwemisebe ngaphansi kokushisa kwemvelo.
Izimiso eziyisisekelo zokudlulisa ukushisa:
Ukuqhuba: Indlela ukushisa okuhamba ngayo entweni kusuka engxenyeni efudumele kuya engxenyeni epholile.
Yiziphi izici ezithinta ukuqhutshwa kokushisa?
① Ukushisa kwezinto zokushabalalisa ukushisa
② Ukumelana nokushisa okubangelwa yisakhiwo sokushabalalisa ukushisa
③ Isimo nosayizi wezinto ezihambisa ukushisa
Imisebe: Isenzakalo sezinto ezishisa kakhulu ezikhipha ukushisa ngqo ngaphandle.
Yiziphi izici ezithinta imisebe yokushisa?
① Ukumelana nokushisa kwendawo ezungezile kanye nendawo ephakathi nendawo (ikakhulukazi uma kucatshangelwa umoya)
② Izici zezinto zokushisa ngokwazo (ngokuvamile imibala emnyama ikhanya ngamandla, kodwa empeleni ukudluliswa kwemisebe akubalulekile kakhulu, ngoba izinga lokushisa lesibani aliphezulu kakhulu futhi imisebe ayinamandla kakhulu)
Ukuguqulwa kwe-Convection: Indlela yokudlulisa ukushisa ngokugeleza kwegesi noma uketshezi.
Yiziphi izici ezithinta ukuguquguquka kokushisa?
① Ukugeleza kwegesi kanye nesivinini
② Umthamo wokushisa othize, isivinini sokugeleza kanye nomthamo woketshezi
Ezibani ze-LED, isinki yokushisa ibangela ingxenye enkulu yezindleko zesibani. Ngakho-ke, ngokwesakhiwo se-radiator, uma izinto zokwakha kanye nomklamo kunganele, khona-ke isibani sizoba nezinkinga eziningi ngemuva kokuthengisa.
Nokho, empeleni, lokhu kumane kuyisibonelo, futhi manje sekugxilwe kukho.
Njengomthengi, ungahlulela kanjani ukuthi ukushabalalisa ukushisa kwesibani kuhle noma cha?
Indlela yobungcweti kakhulu ukusebenzisa imishini yobungcweti ukwenza ukuhlolwa kokushisa kwe-junction.
Kodwa-ke, imishini enjalo yobungcweti ingase ibe nzima kubantu abavamile, ngakho-ke esisele nje ukusebenzisa indlela evamile yokuthinta isibani ukuze sizwe izinga lokushisa.
Bese kuphakama umbuzo omusha. Ingabe kungcono ukuzizwa ushisa noma cha?
Uma i-radiator ishisa uma uyithinta, ayilungile neze.
Uma i-radiator ishisa uma uyithinta, uhlelo lokupholisa kumele lube lubi. Noma ngabe i-radiator ayinawo amandla okushisa anele futhi ukushisa kwe-chip akukwazi ukunyamalala ngesikhathi; noma indawo yokushisa esebenzayo ayanele, futhi kukhona ukuntuleka ekwakhiweni kwesakhiwo.
Ngisho noma isibani singashisi uma usithinta, asisilungile ngempela.
Uma isibani se-LED sisebenza kahle, i-radiator enhle kumele ibe nezinga lokushisa eliphansi, kodwa i-radiator epholile akuyona ngempela elungile.
I-chip ayikhiqizi ukushisa okuningi, iqhuba kahle, ikhipha ukushisa okwanele, futhi ayizizwa ishisa kakhulu esandleni. Lolu uhlelo oluhle lokupholisa, "ububi" kuphela ukuthi luchitha kancane izinto.
Uma kukhona ukungcola ngaphansi kwe-substrate futhi kungekho ukuxhumana okuhle nesinki yokushisa, ukushisa ngeke kukhishwe futhi kuzoqongelela ku-chip. Akushisi uma kuthintwa ngaphandle, kodwa i-chip engaphakathi isivele ishisa kakhulu.
Lapha, ngingathanda ukuncoma indlela ewusizo - "indlela yokukhanyisa yesigamu sehora" yokunquma ukuthi ukushabalalisa ukushisa kuhle yini.
Qaphela: "Indlela yokukhanyisa yesigamu sehora" ivela esihlokweni
Indlela yokukhanyisa isigamu sehora:Njengoba sishilo ngaphambili, ngokuvamile njengoba izinga lokushisa le-LED junction likhuphuka, ukukhanya okukhanyayo kuzoncipha. Ngemuva kwalokho, uma nje silinganisa ushintsho ekukhanyeni kwesibani esikhanya endaweni efanayo, singaphetha ngoshintsho lokushisa le-junction.
Okokuqala, khetha indawo engaphazanyiswa ukukhanya kwangaphandle bese ukhanyisa isibani.
Ngemva kokukhanyisa, thatha imitha yokukhanya ngokushesha bese uyilinganisa, isibonelo i-1000 lx.
Gcina indawo yesibani kanye nemitha yokukhanyisa ingashintshiwe. Ngemva kwesigamu sehora, sebenzisa imitha yokukhanyisa ukuze ulinganise futhi. I-500 lx isho ukuthi ukukhanya okukhanyayo kwehle ngo-50%. Kushisa kakhulu ngaphakathi. Uma uthinta ingaphandle, kusalungile. Kusho ukuthi ukushisa akukaphumi. Umehluko.
Uma inani elilinganisiwe lingu-900 lx futhi ukukhanya kwehla ngo-10% kuphela, kusho ukuthi kuyidatha evamile futhi ukushabalaliswa kokushisa kuhle kakhulu.
Ububanzi bokusetshenziswa kwendlela yokukhanyisa yesigamu sehora: Sibala ijika lokushintsha "i-luminous flux VS junction temperature" lama-chips amaningana asetshenziswa kakhulu. Kusukela kule jika, singabona ukuthi i-luminous flux yehle ngama-lumens amangaki, futhi singazi ngokungaqondile ukuthi izinga lokushisa le-junction lenyuke laya kuma-degree Celsius amangaki.
Ikholomu yokuqala:
Kwi-chip ye-OSRAM S5 (30 30), i-flux ekhanyayo yehle ngo-20% uma kuqhathaniswa no-25°C, kanti izinga lokushisa le-junction selidlule ku-120°C.
Ikholomu ye-two:
Kwi-chip ye-OSRAM S8 (50 50), i-flux ekhanyayo yehle ngo-20% uma kuqhathaniswa no-25°C, kanti izinga lokushisa le-junction selidlule ku-120°C.
Ikholomu yesithathu:
Kwi-chip ye-OSRAM E5 (56 30), i-flux ekhanyayo yehle ngo-20% uma kuqhathaniswa no-25°C, kanti izinga lokushisa le-junction selidlule ku-140°C.
Ikholomu yesine:
Kwi-chip emhlophe ye-OSLOM SSL 90, i-flux ekhanyayo iphansi ngo-15% kunaleyo eku-25°C, futhi izinga lokushisa le-junction selidlule ku-120°C.
Ikholomu yesihlanu:
I-Luminus Sensus Serise chip, i-luminous flux yehle ngo-15% uma kuqhathaniswa no-25℃, futhi izinga lokushisa le-junction lidlule ku-105℃.
Njengoba kungabonakala ezithombeni ezingenhla, uma ukukhanya esimweni esishisayo kwehla ngo-20% ngemva kwesigamu sehora uma kuqhathaniswa nesimo sokubanda, izinga lokushisa lokuhlangana lidlule kakhulu izinga lokubekezelelana kwe-chip. Ngokuyisisekelo kungahlulelwa ukuthi uhlelo lokupholisa alufaneleki.
Vele, lokhu kuyiningi lamacala, futhi konke kunezimo ezihlukile, njengoba kuboniswe esithombeni:
Vele, kuma-LED amaningi, singasebenzisa indlela yokukhanyisa yesigamu sehora ukuze sahlulele ukuthi ilungile noma cha ngaphakathi kokwehla okungu-20%.
Ufundile? Uma ukhetha izibani esikhathini esizayo, kufanele unake. Awukwazi ukubheka nje ukubukeka kwezibani, kodwa sebenzisa amehlo akho abukhali ukukhetha izibani.
Isikhathi sokuthunyelwe: Meyi-24-2024
