Ngaso sonke isikhathi lapho sixhumana namakhasimende, igama elilodwa lishiwo ngokuphindaphindiwe: iwaranti. Ikhasimende ngalinye lifuna isikhathi esihlukile sewaranti, esisukela eminyakeni emibili kuya kwemithathu, kanti abanye bafuna iminyaka emihlanu.
Kodwa empeleni, ezimweni eziningi, amakhasimende ngokwawo angase angazi ukuthi lesi sikhathi sewaranti sitholakala kuphi, noma avele alandele isixuku futhi acabange ukuthi ama-LED kufanele aqinisekiswe isikhathi eside kangaka.
Namuhla, ngizokuyisa ezweni le-LED ukuze uthole ukuthi impilo yezibani ichazwa futhi yahlulelwa kanjani.
Okokuqala, uma kuziwa kuma-LED, ngokubukeka, singasho shazi ukuthi ahlukile emithonjeni yokukhanya yendabuko, ngoba cishe wonke ama-LED anesici esihlukile -isitsha sokushisa.
Amasinki okushisa ahlukahlukene awawona awobuhle bezibani ze-LED, kodwa ukwenza ama-LED asebenze kangcono.
Khona-ke amakhasimende azozibuza ukuthi kungani imithombo yangaphambili yokukhanya yayingavamile ukusebenzisa ama-radiator, kodwa esikhathini se-LED cishe zonke izibani zisebenzisa ama-radiator?
Ngoba imithombo yokukhanya yangaphambili yayithembele emisebeni eshisayo ukuze ikhiphe ukukhanya, njengezibani ze-tungsten filament, ezithembele ekushiseni ukuze zikhiphe ukukhanya, ngakho azikwesabi ukushisa. Isakhiwo esiyisisekelo se-LED yi-semiconductor PN junction. Uma izinga lokushisa liphakeme kancane, ukusebenza kokusebenza kuzokwehla, ngakho-ke ukuchithwa kokushisa kubaluleke kakhulu ku-LED.
Okokuqala, ake sibheke ukwakheka kanye nomdwebo wohlelo lwe-LED
Amathiphu : I-chip ye-LED izokhiqiza ukushisa uma isebenza. Sibhekisela emazingeni okushisa okuhlangana kwayo kwangaphakathi kwe-PN njengezinga lokushisa lokuhlangana (Tj).
Futhi, okubaluleke kakhulu, impilo yezibani ze-LED ihlobene eduze nezinga lokushisa le-junction.
Umqondo okufanele siwuqonde: Uma sikhuluma ngempilo ye-LED, akusho ukuthi ayinakusebenziseka ngokuphelele, kodwa uma ukukhanya kwe-LED okukhiphayo kufinyelela ku-70%, ngokuvamile sicabanga ukuthi 'ukuphila kwayo kuphelile'.
Njengoba kungabonakala emfanekisweni ongenhla, uma izinga lokushisa le-junction lilawulwa ku-105 ° C, khona-ke ukukhanya okukhanyayo kwesibani se-LED kuzoncipha ku-70% lapho isibani se-LED sisetshenziswa cishe amahora angu-10,000; futhi uma izinga lokushisa lokuhlangana lilawulwa cishe ku-60 ° C, khona-ke isikhathi saso sokusebenza sizoba amahora angaba ngu-100,000 + ihora, ukugeleza okukhanyayo kuzokwehla ku-70%. Ukuphila kwesibani kukhuphuka izikhathi ezingu-10.
Ezimpilweni zansuku zonke, esivame ukuhlangana nakho ukuthi ubude bempilo ye-LED ngamahora angu-50,000, okuyidatha empeleni lapho izinga lokushisa lenhlanganiso lilawulwa ku-85°C.
Njengoba izinga lokushisa lokuhlangana lidlala indima ebalulekile empilweni yezibani ze-LED, unganciphisa kanjani izinga lokushisa lokuhlangana? Ungakhathazeki, ake siqale sibheke ukuthi isibani sikuqeda kanjani ukushisa. Ngemuva kokuqonda indlela yokukhipha ukushisa, uzokwazi ngokwemvelo ukuthi unganciphisa kanjani izinga lokushisa lokuhlangana.
Izibani zikuqeda kanjani ukushisa?
Okokuqala, udinga ukwazi izindlela ezintathu eziyisisekelo zokudlulisa ukushisa: i-convection, i-convection, ne-radiation.
Izindlela zokudlulisa eziyinhloko ze-radiator yi-convection kanye ne-convection heat dissipation, kanye nokukhishwa kokushisa kwe-radiation ngaphansi kwe-convection yemvelo.
Izimiso eziyisisekelo zokudlulisa ukushisa:
Ukuqhuba: Indlela ukushisa okuhamba ngayo entweni isuka endaweni efudumele iye endaweni epholile.
Yiziphi izici ezithinta ukuqhutshwa kokushisa?
① I-Thermal conductivity yezinto zokuchitha ukushisa
② Ukumelana nokushisa okubangelwa isakhiwo sokukhipha ukushisa
③ Umumo nosayizi wezinto ezishintshayo ezishisayo
Imisebe: Isenzakalo sezinto ezisezingeni eliphezulu ezikhipha ukushisa ngokuqondile ngaphandle.
Yiziphi izici ezithinta imisebe eshisayo?
① Ukumelana nokushisa kwemvelo ezungezile nendawo (ikakhulukazi kucatshangelwa umoya)
② Izici ze-thermal radiation material ngokwayo (ngokuvamile imibala emnyama ikhanya ngamandla, kodwa empeleni ukudluliswa kwemisebe akubalulekile kakhulu, ngoba izinga lokushisa lesibani aliphezulu kakhulu futhi imisebe ayinamandla kakhulu)
I-Convection: Indlela yokudlulisa ukushisa ngokugeleza kwegesi noma uketshezi.
Yiziphi izici ezithinta i-thermal convection?
① Ukugeleza kwegesi nesivinini
② Umthamo wokushisa othize, isivinini sokugeleza kanye nevolumu yoketshezi
Ezibani ze-LED, i-heater sink ibamba ingxenye enkulu yezindleko zesibani. Ngakho-ke, ngokwesakhiwo se-radiator, uma izinto zokwakha kanye nokuklama kungalungile ngokwanele, khona-ke isibani sizoba nezinkinga eziningi emva kokuthengisa.
Kodwa-ke, empeleni, lezi ziyizifanekiselo nje, futhi manje sekugxilwe kuzo.
Njengomthengi, ukwahlulela kanjani ukuthi ukuchithwa kokushisa kwesibani kuhle noma cha?
Indlela yobungcweti kakhulu ukusebenzisa imishini yobuchwepheshe ukwenza ukuhlolwa kwezinga lokushisa kwe-junction.
Nokho, izinto ezinjalo zochwepheshe zingase zibenqabela abantu abavamile, ngakho-ke esikusele nje ukusebenzisa indlela evamile yokuthinta isibani ukuzwa izinga lokushisa.
Bese kuphakama umbuzo omusha. Kungcono ukuzwa kushisa noma cha?
Uma irediyetha ishisa uma uyithinta, ayilungile neze.
Uma irediyetha ishisa ukuyithinta, isistimu yokupholisa kufanele ibe yimbi. Kuphakathi kokuthi irediyetha ayinawo amandla okukhipha ukushisa anganele futhi ukushisa kwe-chip akukwazi ukuchithwa ngesikhathi; noma indawo ephumelelayo yokukhipha ukushisa ayanele, futhi kukhona ukushiyeka ekwakhiweni kwesakhiwo.
Ngisho noma umzimba wesibani ungashisi ukuwuthinta, akukuhle ngempela.
Uma isibani se-LED sisebenza kahle, i-radiator enhle kufanele ibe nezinga lokushisa eliphansi, kodwa i-radiator epholile ayiyona into enhle.
I-chip ayikukhiqizi ukushisa okuningi, iqhuba kahle, ihlakaza ukushisa okwanele, futhi ayizwa kushisa kakhulu esandleni. Lolu uhlelo oluhle lokupholisa, okuwukuphela "kokubi" ukuthi kungukumosha okuncane kwezinto.
Uma kukhona ukungcola ngaphansi kwe-substrate futhi kungekho ukuxhumana okuhle ne-sink yokushisa, ukushisa ngeke kudluliselwe ngaphandle futhi kuzoqoqa ku-chip. Akushisi uma uthintwa ngaphandle, kodwa i-chip ngaphakathi isivele ishisa kakhulu.
Lapha, ngithanda ukuncoma indlela ewusizo - "indlela yokukhanyisa yehora lesigamu" ukuze nginqume ukuthi ukuchithwa kokushisa kuhle yini.
Qaphela: "Indlela yokukhanyisa yehora elinguhhafu" ivela esihlokweni
Indlela yokukhanyisa isigamu sehora:Njengoba sishilo ngaphambili, ngokuvamile njengoba izinga lokushisa le-junction ye-LED likhuphuka, ukugeleza okukhanyayo kuzokwehla. Khona-ke, inqobo nje uma silinganisa ushintsho ekukhanyeni kwesibani esikhanya endaweni efanayo, singakwazi ukunquma uguquko lokushisa lokuhlangana.
Okokuqala, khetha indawo engaphazanyiswa ukukhanya kwangaphandle bese ukhanyisa isibani.
Ngemva kokukhanyisa, thatha ngokushesha imitha yokukhanya bese uyikala, isibonelo 1000 lx.
Gcina indawo yesibani kanye nemitha yokukhanyisa ingashintshiwe. Ngemva kwesigamu sehora, sebenzisa imitha yokukhanyisa ukuze ukale futhi. 500 lx kusho ukuthi ukukhanya okukhanyayo kwehle ngo-50%. Kushisa kakhulu ngaphakathi. Uma uthinta ingaphandle, kusalungile. Kusho ukuthi ukushisa akukakaphumi. Umehluko.
Uma inani elilinganisiwe lingu-900 lx futhi ukukhanya kwehla ngo-10% kuphela, kusho ukuthi idatha evamile futhi ukuchithwa kokushisa kuhle kakhulu.
Ububanzi bokusetshenziswa "kwendlela yokukhanyisa yehora lesigamu": Sibala "izinga lokushisa elikhanyayo le-flux VS junction" ijika lama-chips ambalwa asetshenziswa kakhulu. Kuleli jika, singabona ukuthi zingaki ama-lumens i-flux ekhanyayo yehlile, futhi singakwazi ukwazi ngokungaqondile ukuthi zingaki ama-degree Celsius izinga lokushisa elikhuphukele kuwo.
Ikholomu yokuqala:
Ku-chip ye-OSRAM S5 (30 30), ukukhanya okukhanyayo kwehle ngo-20% uma kuqhathaniswa no-25°C, futhi izinga lokushisa lenhlanganiso lidlule ku-120°C.
Ikholomu Two:
Ku-chip ye-OSRAM S8 (50 50), ukukhanya okukhanyayo kwehle ngo-20% uma kuqhathaniswa no-25°C, futhi izinga lokushisa lenhlanganiso lidlule ku-120°C.
Ikholomu yesithathu:
Ku-chip ye-OSRAM E5 (56 30), ukukhanya okukhanyayo kwehle ngo-20% uma kuqhathaniswa no-25°C, futhi izinga lokushisa lenhlanganiso lidlule ku-140°C.
Ikholomu yesine:
Ku-chip ye-OSLOM SSL 90 emhlophe, ukugeleza okukhanyayo kungaphansi ngo-15% kunaleyo eku-25°C, futhi izinga lokushisa lenhlanganiso lidlule ku-120°C.
Ikholomu yesihlanu:
I-Luminus Sensus Serise chip, ukukhanya okukhanyayo kwehle ngo-15% uma kuqhathaniswa no-25 ℃, futhi izinga lokushisa lenhlonhlo lidlule ku-105 ℃.
Njengoba kungase kubonakale ezithombeni ezingenhla, uma ukukhanya esimweni esishisayo kwehla ngo-20% ngemva kwesigamu sehora uma kuqhathaniswa nesimo esibandayo, izinga lokushisa lokuhlangana selidlule ngokuyisisekelo ububanzi bokubekezelela kwe-chip. Kungase kwahlulelwe ukuthi isistimu yokupholisa ayifaneleki.
Yiqiniso, lezi yizimo eziningi, futhi konke kunokuhlukile, njengoba kuboniswe esithombeni:
Kunjalo, kuma-LED amaningi, singasebenzisa indlela yokukhanyisa yesigamu sehora ukuze sahlulele ukuthi yinhle noma cha ngaphakathi kokwehla okungu-20%.
Ufundile? Lapho ukhetha izibani esikhathini esizayo, kufanele unake. Awukwazi nje ukubheka ukubonakala kwezibani, kodwa sebenzisa amehlo akho abukhali ukuze ukhethe izibani.
Isikhathi sokuthumela: May-24-2024
