Yaya Haske ta LED Take Sani?

Lalacewar hasken LED yana nufin cewa bayan wani lokaci na haske, ƙarfinsa zai yi ƙasa da na asali, kuma ƙananan ɓangaren hasken LED ɗin yana lalacewa. , Kowane mutum kuma ya gane cewa hanya mai mahimmanci don rage lalacewar haske shine inganta yanayin zafi. Duk da haka, kwanan nan Cibiyar Kula da Muhalli na Haske ta gwada sakamakon gwajin fitilun tituna, kuma lalata hasken mafi yawan fitilun titi ba zai iya cika ka'idojin amfani ba. Lalacewar hasken bayan awanni 1200 na haske shine 8%, mafi munin shine 26%, kuma matsakaici shine 14%. Dangane da sakamakon gwajin mu, lokacin da kullin zafin jiki ya kasance digiri 105, lalata haske 14% shima yakamata yayi aiki awanni 6000. Ana iya ganin zafin kulli na mafi yawan fitilun titi yana sama da digiri 105 ko fiye. Wani babban ɓangare na kamfanin dole ne ya yarda da irin wannan sakamakon, saboda suna tunanin cewa an tsara su a hankali. Ainihin halin da ake ciki na iya zama iri ɗaya, amma ba za a iya shakkar sakamakon gwajin ba. Menene matsalar? Editan ya yi imanin cewa mai yiwuwa ba za a ƙera radiator ɗin da kyau ba, amma yana iya. To amma me yasa wutar lantarki ta wutar lantarki akai-akai ke haifar da rubewar haske? Wannan yana kama da ɗan sama. Amma a gaskiya, akwai gaske masu tsanani. Bari mu fara daga farko! 1. Dukanmu mun san cewa LED's Viaticity diode ne, kuma mafi mahimmancin halayen lantarki na diode shine yanayin Vodiat. 2. Kodayake halayen zafin jiki na LED Voldown halaye ba iri ɗaya bane da na matsakaicin diode, babban bambanci shine halayen zafinsa. A gaskiya ma, duk diodes suna da matsalar halayen zafin jiki, amma LED yana buƙatar kulawa ta musamman don kula da kulawa ta musamman. Wannan saboda: Aiki na yanzu na babban ƙarfin LED yana da girma, 1W shine 0.35A, 3-5W shine 0.7A, 20W shine 1.05A, 30W shine 1.75A, 50W shine 3.5A shine 3.5A. Koyaya, wasu mutane na iya jin cewa tabbataccen halin yanzu na diode mai gyara shima na iya kaiwa irin wannan babban darajar. Saboda ingancin hasken da ake fitarwa a halin yanzu yana da ɗan ƙaranci, yawancin ƙarfin shigar da wutar lantarki ya koma zafi, don haka dumamasa yana da yawa. Idan radiator bai yi kyau ba, zafin kulli zai tashi sosai. LED ɗin ya bambanta da diode mai gyarawa. Ba a yi shi da kayan silicon na gaba ɗaya ba, amma an yi shi da kayan musamman (kamar nitride). Sabili da haka, halayen zafin jiki na halayen kwanto sun bambanta da matsakaicin diode, amma don zama mahimmanci fiye da matsakaicin diode. Alal misali, halayen zafin jiki na halayen kwanto na matsakaicin diode shine -2mv / C. 3. Matsalolin da karuwar zafin kullin ke haifarwa Bayan kullin LED ya tashi, farkon fitowar hasken ya ragu. Haɓakawa na sauƙi da ke haifar da haɓakar zafin jiki na kulli ba shi da kyau saboda ƙimar zafin jiki na halayen voltano ba shi da kyau, wanda ke nufin cewa zafin jiki yana da girma kuma an bar halayen don motsawa. Misali, a ɗauka cewa zafin jiki yana tashi da digiri 50, sannan halayen Fa'an za su matsa zuwa 200mv zuwa hagu. Yin amfani da wutar lantarki akai-akai na samar da wutar lantarki zai kara yawan ingantaccen halin yanzu na LED tare da karuwar yawan zafin jiki. Saboda ƙarfin wutar lantarki ya kasance akai-akai, kuma halayen Fa'an sun koma hagu, sakamakon yana ƙaruwa. Ana iya gani daga halayen Fuan na Hoto na 2 cewa idan kullun wutar lantarki yana da wutar lantarki ta 3.3V a dakin da zafin jiki, halin yanzu na gaba shine 350mA; bayan zafin kulli ya tashi da digiri 50, halayen voltano sun bar 0.2V, wanda yake daidai da wutar lantarki, wanda yake daidai da wutar lantarki, wanda yake daidai da wutar lantarki. Ƙarfafa yana ɗaukaka zuwa 3.5V. A wannan lokacin, ingantaccen halin yanzu zai ƙaru zuwa 600mA. 4. Bayan da aka yi amfani da mugunyar zagayowar yanayin zafi don ƙara muguwar zagayowar wutar lantarki na akai-akai, saboda ƙarfin wutar lantarki bai canza ba, ƙarfin shigar da LED ɗin yana ƙaruwa zuwa 3.3VX0.6A = 1.98W, wanda yana da ninki biyu da ninki biyu. Bayan zafin kulli ya tashi, hasken wutan zai ragu, wanda ke nufin karin ikon shigar da shi yana canza zuwa thermal energy, wato idan na gaba ya karu a wannan lokaci, haskensa baya karuwa yayin da yake karuwa, amma zai ragu. . Sabili da haka, karuwa a cikin ingantaccen halin yanzu a wannan lokacin zai haifar da karuwa a cikin kullin zafin jiki kawai, kuma ba zai ƙara fitowar hasken ba. Sabili da haka, bayan haɓaka zafin kulli, tabbataccen halin yanzu yana ƙaruwa, zafin kulli yana ƙaruwa, kuma na gaba yana ƙaruwa, wanda ke haifar da mummunan zagayowar yanayin zafi na kulli. Ƙarshe: Yin amfani da wutar lantarki akai-akai na samar da wutar lantarki zai ƙara yawan zafin jiki, ƙara lalata haske, da kuma rage rayuwa. Saboda haka, daga binciken da ya gabata, za mu iya zana irin wannan ƙarshe: Yin amfani da wutar lantarki akai-akai na samar da wutar lantarki zai ƙara yawan zafin jiki, kuma sakamakon ƙara yawan zafin jiki yana ƙaruwa ta hanyar lalata haske da kuma rage tsawon rayuwa. Zaton cewa LED yana kunna a digiri 25 a cikin dakin da zafin jiki, kullin zafin jiki zai tashi bayan ya tashi. A ɗauka cewa an ƙera radiator ɗin don ya tashi zuwa digiri 75, wato, zafin kullin yana ƙaruwa da digiri 50, to, ingantaccen halin yanzu zai ƙaru zuwa 600mA zuwa 600mA zuwa 600mA. Jimlar ƙarfin ya ƙaru daga 1.155W zuwa 1.98W, haɓakar 0.825W 0.825W. Kuma ƙarfin da ya karu a wannan bangare kusan duk ya koma zafi. Zaton cewa ingantaccen hasken LED na asali shine 30%, wato, ƙarfin shigarwar 70% (0.8W) yana canzawa zuwa makamashin thermal zuwa makamashin thermal makamashi. Yanzu akwai makamashin thermal sau biyu waɗanda ke buƙatar tarwatsewa daga radiyo. Babu shakka, wannan ba a la'akari da ainihin ƙirar radiyo. Wannan ya ƙara yawan zafin kulli na LED da digiri 50 zuwa digiri 125. Bari mu koma Hoto na 1 don ganin lankwasar lalatawar gani. Rayuwar digiri 125 na haske kusan sa'o'i 1200 ne. Sa'an nan kuma za ku iya bayyana dalilin da yasa aka tsara radiator a hankali. Har yanzu yana da yawan ruɓewar haske da ɗan gajeren rayuwa! Don haka, dole ne a samar da wutar lantarki zuwa LED ta hanyar samar da wutar lantarki akai-akai. Bayan halin yanzu yana dawwama, komai yadda yanayin zafi ya canza, halayen kwanto suna motsawa hagu, kuma halin yanzu baya canzawa! Yanayin kulli ba zai zama mummuna ba!