Ngalo lonke ixesha sinxibelelana nabathengi, igama elinye likhankanywa ngokuphindaphindiweyo: iwaranti. Umthengi ngamnye ufuna ixesha lewaranti elahlukileyo, eliqala kwiminyaka emibini ukuya kwiminyaka emithathu, kwaye abanye bafuna iminyaka emihlanu.
Kodwa enyanisweni, kwiimeko ezininzi, abathengi ngokwabo basenokungazi ukuba eli xesha lewaranti livela phi, okanye balandela nje isihlwele baze bacinge ukuba ii-LED kufuneka ziqinisekiswe ixesha elide kangaka.
Namhlanje, ndiza kukusa kwihlabathi le-LED ukuze ufumane indlela ubomi bezibane obuchazwa kwaye bugwetywa ngayo.
Okokuqala, xa kufikwa kwii-LED, ngokwembonakalo yazo, singabona ngokujonga nje ukuba zahlukile kwimithombo yokukhanya yendabuko, kuba phantse zonke ii-LED zinesici esahlukileyo -isinki yobushushu.
Ii-heat sinks ezahlukeneyo azilungiselelwanga ubuhle bezibane ze-LED, kodwa zenzelwe ukwenza ii-LED zisebenze ngcono.
Emva koko abathengi baya kuzibuza ukuba kutheni imithombo yokukhanya yangaphambili yayingafane isebenzise ii-radiator, kodwa kwixesha le-LED phantse zonke izibane zisebenzisa ii-radiator?
Kuba imithombo yokukhanya yangaphambili yayixhomekeke kwimitha yobushushu ukuze ikhuphe ukukhanya, njengezibane ze-tungsten filament, ezixhomekeke kubushushu ukuze zikhuphe ukukhanya, ngoko ke aziboyiki ubushushu. Ulwakhiwo olusisiseko lwe-LED yi-semiconductor PN junction. Ukuba ubushushu buphezulu kancinci, ukusebenza kuya kuncipha, ngoko ke ukuchithwa kobushushu kubaluleke kakhulu kwi-LED.
Okokuqala, makhe sijonge ukwakheka kunye nomzobo we-schematic we-LED
Iingcebiso: Itshiphu ye-LED iya kuvelisa ubushushu xa isebenza. Sibhekisa kubushushu be-PN junction yayo yangaphakathi njengobushushu be-junction (Tj).
Kwaye, okona kubaluleke kakhulu, ubomi bezibane ze-LED bunxulumene kakhulu nobushushu be-junction.
Ingcamango ekufuneka siyiqonde: Xa sithetha ngobomi be-LED, akuthethi ukuba ayinakusetyenziswa kwaphela, kodwa xa ukukhanya kwe-LED kufikelela kwi-70%, ngokubanzi sicinga ukuba 'ubomi bayo buphelile'.
Njengoko kunokubonwa kumfanekiso ongentla, ukuba ubushushu be-junction bulawulwa kwi-105°C, ngoko ukukhanya kwe-fluminous yesibane se-LED kuya kuncipha ukuya kwi-70% xa isibane se-LED sisetyenziswa malunga neeyure ezili-10,000; kwaye ukuba ubushushu be-junction bulawulwa malunga ne-60°C, ngoko ixesha laso lokusebenza liya kuba malunga neeyure ezili-100,000 + iyure, ukukhanya kwe-fluminous kuya kuncipha ukuya kwi-70%. Ubomi besibane buyandiswa ngamaxesha ali-10.
Kubomi bemihla ngemihla, into esihlala siyibona kukuba ixesha lobomi be-LED ziiyure ezingama-50,000, nto leyo ethetha ukuba ubushushu be-junction bulawulwa kwi-85°C.
Ekubeni ubushushu be-junction budlala indima ebaluleke kangaka kubomi bezibane ze-LED, ungabunciphisa njani ubushushu be-junction? Ungakhathazeki, masiqale sijonge indlela isibane esibususa ngayo ubushushu. Emva kokuqonda indlela yokuphelisa ubushushu, uya kwazi ngokwemvelo indlela yokunciphisa ubushushu be-junction.
Izibane zibususa njani ubushushu?
Okokuqala, kufuneka wazi iindlela ezintathu ezisisiseko zokudlulisa ubushushu: ukuhanjiswa kobushushu, ukuhanjiswa kobushushu, kunye nokukhanya.
Iindlela eziphambili zokudlulisela i-radiator kukuhambisa ubushushu kunye nokusasazwa kobushushu be-convection, kunye nokusasazwa kobushushu be-radiation phantsi kwe-convection yendalo.
Imigaqo esisiseko yokudluliselwa kobushushu:
Ukuqhuba: Indlela ubushushu obuhamba ngayo kwinto ukusuka kwindawo efudumeleyo ukuya kwindawo epholileyo.
Ziziphi izinto ezichaphazela ukuhanjiswa kobushushu?
① Ukuhanjiswa kobushushu kwezinto zokusasaza ubushushu
② Ukumelana nobushushu okubangelwa yisakhiwo sokusasaza ubushushu
③ Imilo kunye nobukhulu bezinto eziqhuba ubushushu
Ukukhanya: Imeko yezinto ezinobushushu obuphezulu ezikhupha ubushushu ngaphandle ngqo.
Ziziphi izinto ezichaphazela imitha yobushushu?
① Ukumelana nobushushu bendalo esingqongileyo kunye nendawo ephakathi (ingakumbi xa kujongwa umoya)
② Iimpawu zezinto ezisebenzisa imitha yobushushu (ngokubanzi imibala emnyama ikhanya ngamandla, kodwa eneneni ukudluliselwa kwemitha akubalulekanga kangako, kuba ubushushu besibane abuphezulu kakhulu kwaye imitha ayinamandla kakhulu)
I-Convection: Indlela yokudlulisa ubushushu ngokuhamba kwegesi okanye ulwelo.
Ziziphi izinto ezichaphazela i-thermal convection?
① Ukuhamba kwegesi kunye nesantya
② Umthamo othile wobushushu, isantya sokuhamba kunye nomthamo wolwelo
Kwizibane ze-LED, isinki yobushushu ibangela ixabiso elikhulu lesibane. Ke ngoko, ngokwesakhiwo seradiyetha, ukuba izixhobo kunye noyilo azanelanga, isibane siya kuba neengxaki ezininzi emva kokuthengisa.
Nangona kunjalo, eneneni, ezi zizinto eziza kwenzeka kwangaphambili, kwaye ngoku kugxilwe kuzo.
Njengomthengi, ugweba njani ukuba ubushushu besibane bulungile okanye akunjalo?
Eyona ndlela yobungcali kukusebenzisa izixhobo zobungcali ukwenza uvavanyo lobushushu be-junction.
Nangona kunjalo, izixhobo zobungcali ezinjalo zinokuba nzima kubantu abaqhelekileyo, ngoko ke esisele kukusebenzisa indlela yendabuko yokuchukumisa isibane ukuze siqonde ubushushu.
Emva koko kuvela umbuzo omtsha. Ngaba kungcono ukuziva ushushu okanye ungaziva ushushu?
Ukuba i-radiator ishushu xa uyichukumisa, ngokuqinisekileyo ayilunganga.
Ukuba i-radiator ishushu xa uyichukumisa, inkqubo yokupholisa kufuneka ibe mbi. Nokuba i-radiator ayinawo amandla okusasaza ubushushu aneleyo kwaye ubushushu be-chip abunakuphela ngexesha; okanye indawo yokusasaza ubushushu esebenzayo ayanelanga, kwaye kukho iziphene kuyilo lwesakhiwo.
Nokuba umzimba wesibane awushushu xa uwuchukumisa, awulunganga kangako.
Xa isibane se-LED sisebenza kakuhle, i-radiator elungileyo kufuneka ibe nobushushu obuphantsi, kodwa i-radiator epholileyo ayisoloko ilungile.
Itshiphu ayivelisi ubushushu bungako, iqhuba kakuhle, ikhupha ubushushu obaneleyo, kwaye ayiziva ishushu kakhulu esandleni. Le yinkqubo yokupholisa elungileyo, "ingxaki" kuphela kukuba ichitha kancinci izinto.
Ukuba kukho ukungcola phantsi kwe-substrate kwaye akukho kudibana kakuhle ne-heat sink, ubushushu abuyi kudluliselwa ngaphandle kwaye buza kuqokelelwa kwi-chip. Ayishushu xa uyichukumisa ngaphandle, kodwa i-chip engaphakathi sele ishushu kakhulu.
Apha, ndingathanda ukucebisa indlela eluncedo - "indlela yokukhanyisa isiqingatha seyure" yokufumanisa ukuba ubushushu bulungile na.
Qaphela: "Indlela yokukhanyisa isiqingatha seyure" ivela kwinqaku
Indlela yokukhanyisa isiqingatha seyure:Njengoko besitshilo ngaphambili, ngokubanzi njengoko ubushushu be-LED junction bunyuka, i-luminous flux iya kuncipha. Emva koko, lo gama nje silinganisa utshintsho ekukhanyeni kwesibane esikhanyayo kwindawo enye, sinokuqikelela utshintsho kubushushu be-junction.
Okokuqala, khetha indawo engaphazanyiswa kukukhanya kwangaphandle uze ukhanyise isibane.
Emva kokukhanyisa, thatha imitha yokukhanya ngoko nangoko uze uyilinganise, umzekelo i-1000 lx.
Gcina indawo yesibane kunye nemitha yokukhanyisa ingatshintshanga. Emva kwesiqingatha seyure, sebenzisa imitha yokukhanyisa ukulinganisa kwakhona. I-500 lx ithetha ukuba ukukhanya kwehle nge-50%. Kushushu kakhulu ngaphakathi. Ukuba uchukumisa ngaphandle, kusalungile. Kuthetha ukuba ubushushu abukaphumi. Umahluko.
Ukuba ixabiso elilinganisiweyo liyi-900 lx kwaye ukukhanya kwehla nge-10% kuphela, oko kuthetha ukuba yidatha eqhelekileyo kwaye ukusasazwa kobushushu kulungile kakhulu.
Ububanzi bokusetyenziswa kwendlela yokukhanyisa yesiqingatha seyure: Sibala ijika lokutshintsha kwe-"luminous flux VS junction temperature" yeetships ezininzi ezisetyenziswa rhoqo. Kule jika, sinokubona ukuba zingaphi iilumens i-luminous flux eyehlileyo, kwaye singazi ngokungathanga ngqo ukuba zingaphi iidigri zeCelsius iqondo lobushushu lejunction elinyukele kuzo.
Ikholamu yokuqala:
Kwitshiphu ye-OSRAM S5 (30 30), i-luminous flux yehle nge-20% xa ithelekiswa ne-25°C, kwaye ubushushu be-junction budlule kwi-120°C.
Ikholamu ye-two:
Kwitshiphu ye-OSRAM S8 (50 50), i-luminous flux yehle nge-20% xa ithelekiswa ne-25°C, kwaye ubushushu be-junction budlule kwi-120°C.
Ikholamu yesithathu:
Kwitshiphu ye-OSRAM E5 (56 30), i-luminous flux yehle nge-20% xa ithelekiswa ne-25°C, kwaye ubushushu be-junction budlule kwi-140°C.
Ikholamu yesine:
Kwi-chip emhlophe ye-OSLOM SSL 90, i-luminous flux iphantsi nge-15% kunaleyo ikwi-25°C, kwaye ubushushu be-junction budlule kwi-120°C.
Ikholamu yesihlanu:
Itshiphu yeLuminus Sensus Serise, i-luminous flux yehle nge-15% xa ithelekiswa ne-25℃, kwaye ubushushu be-junction budlule kwi-105℃.
Njengoko kunokubonwa kwimifanekiso engasentla, ukuba ukukhanya kwimeko eshushu kwehla ngama-20% emva kwesiqingatha seyure xa kuthelekiswa nemeko ebandayo, ubushushu bomngxuma budlule kwinqanaba lokunyamezelana kwetshiphusi. Kunokugwetywa ukuba inkqubo yokupholisa ayifanelekanga.
Kakade ke, eli lelona candelo lininzi lamatyala, kwaye yonke into ineziphene, njengoko kubonisiwe kumfanekiso:
Kakade ke, kwii-LED ezininzi, singasebenzisa indlela yokukhanyisa isiqingatha seyure ukugweba ukuba ilungile okanye ayilunganga ngaphakathi kwe-20%.
Ngaba ufundile? Xa ukhetha izibane kwixesha elizayo, kufuneka unikele ingqalelo. Awunakujonga nje inkangeleko yezibane, kodwa sebenzisa amehlo akho abukhali ukukhetha izibane.
Ixesha leposi: Meyi-24-2024
