Ngalo lonke ixesha sinxibelelana nabathengi, igama elinye likhankanywa ngokuphindaphindiweyo: iwaranti. Umthengi ngamnye ufuna ixesha elahlukileyo lewaranti, ukusuka kwiminyaka emibini ukuya kwiminyaka emithathu, kwaye abanye bafuna iminyaka emihlanu.
Kodwa eneneni, kwiimeko ezininzi, abathengi ngokwabo banokungazi ukuba eli xesha lewaranti livela phi, okanye balandela nje isihlwele kwaye bacinga ukuba ii-LED kufuneka ziqinisekiswe ixesha elide.
Namhlanje, ndiya kukusa kwihlabathi le-LED ukufumanisa ukuba ubomi bezibane buchazwa kwaye bugwetywe njani.
Okokuqala, xa kufikwa kwii-LED, ngokwembonakalo, sinokutsho nje ukuba zahlukile kwimithombo yokukhanya yendabuko, kuba phantse zonke ii-LED zinento eyahlukileyo -isitya sobushushu.
Iindidi ezahlukeneyo zokushisa azikho ubuhle bezibane ze-LED, kodwa ukwenza ii-LED zisebenze ngcono.
Ke abathengi baya kuzibuza ukuba kutheni imithombo yokukhanya yangaphambili ingafane isebenzise iiradiator, kodwa kwixesha le-LED phantse zonke izibane zisebenzisa iiradiator?
Ngenxa yokuba imithombo yokukhanya yangaphambili yayixhomekeke kwimitha ye-thermal ukuze ikhuphe ukukhanya, njengezibane ze-tungsten filament, ezixhomekeke kubushushu ukuze zikhuphe ukukhanya, ngoko ke ayikayiki ubushushu. Isakhiwo esisisiseko se-LED yi-semiconductor PN junction. Ukuba iqondo lokushisa liphezulu kancinci, ukusebenza kokusebenza kuya kuncipha, ngoko ke ukutshatyalaliswa kobushushu kubaluleke kakhulu kwi-LED.
Okokuqala, makhe sijonge ukwakheka kunye nomzobo we-LED
Iingcebiso : I-chip ye-LED iya kwenza ubushushu xa isebenza. Sibhekisela kwiqondo lokushisa le-PN yangaphakathi ye-junction njengeqondo lokushisa lokuhlangana (Tj).
Kwaye, okona kubaluleke kakhulu, ubomi bezibane ze-LED buhambelana ngokusondeleyo nobushushu be-junction.
Ingqikelelo ekufuneka siyiqonde: Xa sithetha ngobomi be-LED, ayithethi ukuba ayinakusetyenziswa ngokupheleleyo, kodwa xa ukukhanya kwe-LED kuphuma kwi-70%, sicinga ngokubanzi ukuba 'ubomi bayo buphelile'.
Njengoko kunokubonwa kulo mzobo ungentla, ukuba ukushisa kwe-junction kulawulwa kwi-105 ° C, ke ukukhanya okukhanyayo kwesibane se-LED kuya kunciphisa i-70% xa isibane se-LED sisetyenziselwa malunga neeyure ze-10,000; kwaye ukuba ukushisa kwe-junction kulawulwa malunga ne-60 ° C, ngoko ixesha layo lokusebenza liya kuba malunga neeyure ze-100,000 + iyure, i-flux ekhanyayo iya kuncipha ukuya kuma-70%. Ubomi besibane banda ngamaxesha angama-10.
Kubomi bemihla ngemihla, into esihlala sidibana nayo kukuba ubomi be-LED buziiyure ezingama-50,000, eyona nto iyidatha xa ubushushu besiphambuka bulawulwa kwi-85 ° C.
Ekubeni ubushushu be-junction budlala indima ebalulekileyo kubomi bezibane ze-LED, njani ukunciphisa ukushisa kwe-junction? Ungakhathazeki, masiqale sijonge indlela isibane esibuchitha ngayo ubushushu. Emva kokuqonda indlela yokutshatyalaliswa kobushushu, uya kuyazi ngokwendalo indlela yokunciphisa ubushushu be-junction.
Izibane zibuchitha njani ubushushu?
Okokuqala, kufuneka wazi iindlela ezintathu ezisisiseko zokuhambisa ubushushu: ukuhanjiswa, ukuhambisa, kunye nemitha.
Iindlela eziphambili zokuhambisa i-radiator zi-conduction kunye ne-convection heat dissipation, kunye ne-radiation heat dissipation phantsi kwe-convection yendalo.
Imigaqo esisiseko yokudluliselwa kobushushu:
Ukuqhuba: Indlela ubushushu obuhamba ngayo kwinto ukusuka kwindawo eshushu ukuya kwindawo epholileyo.
Zeziphi izinto ezichaphazela ukwenziwa kobushushu?
① I-Thermal conductivity yezixhobo zokulahla ubushushu
② Ukumelana nokushisa okubangelwa yisakhiwo sokutshatyalaliswa kobushushu
③ Ubume kunye nobukhulu bemathiriyeli ye-thermal conductive
Imitha: Isenzeko sezinto zobushushu obuphezulu ezikhupha ubushushu ngqo ngaphandle.
Zeziphi izinto ezichaphazela imitha ye-thermal?
① Ukumelana ne-thermal yendawo engqongileyo kunye nephakathi (ikakhulu kuqwalaselwa umoya)
② Iimpawu zesixhobo semitha ye-thermal ngokwayo (ngokubanzi imibala emnyama ikhupha ngamandla, kodwa eneneni ukuhanjiswa kwemitha ayibalulekanga kakhulu, kuba ubushushu besibane aliphezulu kakhulu kwaye imitha ayinamandla kakhulu)
I-Convection: Indlela yokudlulisa ubushushu ngokuhamba kwerhasi okanye ulwelo.
Ziziphi izinto ezichaphazela i-thermal convection?
① Ukuhamba kwerhasi kunye nesantya
② Umthamo wobushushu obuthile, isantya sokuhamba kunye nomthamo wolwelo
Kwizibane ze-LED, i-heat sink akhawunti inxalenye enkulu yeendleko zesibane. Ngoko ke, ngokubhekiselele kwisakhiwo se-radiator, ukuba izixhobo kunye noyilo azilungile ngokwaneleyo, ngoko isibane siya kuba neengxaki ezininzi emva kokuthengisa.
Nangona kunjalo, eneneni, ezi zisithunzi nje, kwaye ngoku kugxilwe.
Njengomthengi, ugweba njani ukuba ukuchithwa kobushushu kwesibane kulungile okanye akunjalo?
Eyona ndlela yobuchwephesha kukusebenzisa izixhobo zobuchwephesha ukwenza uvavanyo lobushushu kwisiphambuka.
Nangona kunjalo, ezo zixhobo zobuchwephesha zisenokungavumelekanga kubantu abaqhelekileyo, ngoko ekuphela kwento esishiyekileyo kukusebenzisa eyona ndlela iqhelekileyo yokuchukumisa isibane ukuva ubushushu.
Emva koko kuphakama umbuzo omtsha. Ngaba kungcono ukuziva ushushu okanye akunjalo?
Ukuba iradiyetha ishushu xa uyibamba, ayilunganga.
Ukuba iradiyetha ishushu ukuyibamba, inkqubo yokupholisa kufuneka ibe mbi. Nokuba iradiyetha ayinayo umthamo owaneleyo wokuchitha ubushushu kwaye ubushushu bechip abunakuchithwa ngexesha; okanye indawo yokutshatyalaliswa kobushushu esebenzayo ayanele, kwaye kukho iintsilelo kuyilo lwesakhiwo.
Nokuba umzimba wesibane awushushu ukuwubamba, awulunganga.
Xa isibane se-LED sisebenza ngokufanelekileyo, i-radiator elungileyo kufuneka ibe neqondo lokushisa eliphantsi, kodwa i-radiator epholileyo ayiyona into enhle.
I-chip ayivelisi ubushushu obuninzi, iqhuba kakuhle, ichitha ubushushu obaneleyo, kwaye ayiziva ishushu kakhulu esandleni. Le yinkqubo efanelekileyo yokupholisa, kuphela "i-disadvantage" kukuba yinto encinci yenkunkuma yezinto.
Ukuba kukho ukungcola phantsi kwe-substrate kwaye akukho qhagamshelwano olulungileyo kunye ne-heat sink, ubushushu abuyi kuthunyelwa ngaphandle kwaye buya kuqokelela kwi-chip. Akushushu kwi-touch ngaphandle, kodwa i-chip ngaphakathi sele ishushu kakhulu.
Apha, ndingathanda ukucebisa indlela eluncedo - "indlela yokukhanyisa isiqingatha seyure" ukujonga ukuba ukutshatyalaliswa kobushushu kulungile.
Qaphela: "Indlela yokukhanyisa isiqingatha seyure" ivela kwinqaku
Indlela yokukhanyisa yesiqingatha seyure:Njengoko besesitshilo ngaphambili, ngokubanzi njengoko ubushushu be-junction ye-LED bukhula, ukukhanya okukhanyayo kuya kuncipha. Emva koko, nje ukuba silinganisa utshintsho ekukhanyeni kwesibane esikhanyisa kwindawo efanayo, sinokuthi sithintele utshintsho kwiqondo lokushisa lokuhlangana.
Okokuqala, khetha indawo engaphazanyiswa kukukhanya kwangaphandle kwaye ukhanyise isibane.
Emva kokukhanyisa, ngokukhawuleza thatha imitha yokukhanya kwaye uyilinganise, umzekelo 1000 lx.
Gcina indawo yesibane kunye nemitha yokukhanyisa ingatshintshi. Emva kwesiqingatha seyure, sebenzisa imitha yokukhanyisa ukulinganisa kwakhona. I-500 lx ithetha ukuba i-flux ekhanyayo yehle nge-50%. Kushushu kakhulu ngaphakathi. Ukuba ubamba umphandle, kusalungile. Kuthetha ukuba ubushushu abuzange buphume. Umahluko.
Ukuba ixabiso elilinganisiweyo liyi-900 lx kwaye ukukhanya kwehla kuphela nge-10%, kuthetha ukuba yidatha eqhelekileyo kwaye ukutshatyalaliswa kobushushu kuhle kakhulu.
Umda wokusetyenziswa kwe "indlela yokukhanyisa yesiqingatha seyure": Sibala "iqondo lobushushu elikhanyayo le-VS elidibanisayo" lokutshintsha ijika leetshiphusi ezininzi ezisetyenziswa ngokuqhelekileyo. Ukusuka kweli jiko, sinokubona ukuba zingaphi iilumens eziye zehla, kwaye singazi ngokungangqalanga ukuba zingaphi iidigri zeCelsius ubushushu besiphambuka bunyukile.
Umqolo wokuqala:
Kwi-chip ye-OSRAM S5 (30 30), ukukhanya okukhanyayo kwehle nge-20% xa kuthelekiswa ne-25 ° C, kwaye ukushisa kwe-junction kudlule i-120 ° C.
Ikholamu two:
Kwi-chip ye-OSRAM S8 (50 50), ukukhanya okukhanyayo kwehle nge-20% xa kuthelekiswa ne-25 ° C, kwaye ukushisa kwe-junction kudlule i-120 ° C.
Umqolo wesithathu:
Kwi-chip ye-OSRAM E5 (56 30), ukukhanya okukhanyayo kwehle nge-20% xa kuthelekiswa ne-25 ° C, kwaye ukushisa kwe-junction kudlule i-140 ° C.
Umqolo wesine:
Kwi-chip emhlophe ye-OSLOM SSL 90, i-flux ekhanyayo yi-15% ephantsi kunaleyo kwi-25 ° C, kwaye ukushisa kwe-junction kudlule i-120 ° C.
Umqolo wesihlanu:
I-Luminus Sensus Serise chip, i-flux ekhanyayo yehle nge-15% xa ithelekiswa ne-25 ℃, kwaye ubushushu besiphambuka budlule kwi-105 ℃.
Njengoko kunokubonwa kule mifanekiso ingasentla, ukuba ukukhanya kwimeko eshushu kwehla ngama-20% emva kwesiqingatha seyure xa kuthelekiswa nemozulu ebandayo, ubushushu besiphambuka bugqithise ngokusisiseko ukunyamezelana kwe-chip. Ngokusisiseko kunokugwetywa ukuba inkqubo yokupholisa ayifanelekanga.
Ewe kunjalo, olu luninzi lwamatyala, kwaye yonke into inezikhethelo, njengoko kubonisiwe kulo mfanekiso:
Ngokuqinisekileyo, kwii-LED ezininzi, sinokusebenzisa indlela yokukhanyisa yesiqingatha seyure ukugweba ukuba ilungile okanye ayikho ngaphakathi kwe-20 yehla.
Ngaba ufundile? Xa ukhetha izibane kwixesha elizayo, kufuneka ubeke ingqalelo. Awukwazi ukujonga nje ukubonakala kwezibane, kodwa sebenzisa amehlo akho abukhali ukukhetha izibane.
Ixesha lokuposa: May-24-2024
