1. Bayyani Game da Kayayyaki
Wannan takarda tana cika dalla-dalla game da ƙayyadaddun bayanai na fasaha da jagororin aikace-aikace na LED mai launin jajaye mai zurfi mai hawan saman tare da babban aminci. Na'urar tana amfani da kunshin EMC (Epoxy Molding Compound), tana ba da ingantaccen aiki don yanayi mai wahala. Babban aikace-aikacenta yana cikin sashin hasken gandun daji, yana samar da takamaiman bakan haske da ake buƙata don hanyoyin ilimin halittar shuke-shuke.
1.1 Siffofi na Asali da Matsayi
Siffar da ta bambanta LED ita ce fitowarta a kololuwar tsawon zango na 660 nanometers, wanda ya sanya ta cikin bakan haske mai jajaye mai nisa. Wannan tsayin zango yana da mahimmanci ga photosynthesis da photomorphogenesis a cikin shuke-shuke, yana rinjayar furanni, tsawaita kara, da ci gaban 'ya'yan itace. Ƙaramin ƙafa na 3.00mm x 3.00mm x 3.08mm (kunshin 3030) yana ba da damar ƙirar tsararrun fitila masu yawa a cikin kayan hasken girma. Muhimman abubuwan tallacewa sun haɗa da dacewarta da daidaitattun hanyoyin siyar da guduro marasa gubar, da bin umarnin RoHS, da kuma Matakin Hancin Danshi (MSL) na 3, wanda ke ba da bayani game da kulawa da adana kayayyaki kafin haɗawa.
1.2 Ayyukan Da Ake Nufi
An tsara wannan ɓangaren musamman don noma da aka sarrafa muhalli (CEA) da ci-gaban gandun daji. Abubuwan amfani da aka saba yi sun haɗa da:
- Ƙarin Haskakawa a cikin Greenhouse:Don tsawaita lokacin haske ko ƙara ƙarfin haske a lokutan ƙarancin haske.
- Gonaki na Tsaye da Masana'antun Shuke-Shuke:A matsayin wani ɓangare na jerin fitilolin LED masu yawan bakan haske a cikin cikakkun yanayin girma na wucin gadi.
- Dakunan Binciken Ƙwayoyin Jiki:Samar da takamaiman ingancin haske don tsara girma da ci gaban 'ya'yan itace a cikin yanayi mara kwayoyin cuta.
- Ƙofofin Girma Na Musamman:Don bincike akan ilimin halittar shuke-shuke da ingantattun girke-girken girma.
2. Bincike Mai Zurfi na Sigogin Fasaha
Fahimtar cikakkun ma'auni na gabaɗaya da halayen aiki na yau da kullun yana da mahimmanci don ingantaccen ƙira na kewaye da tabbatar da aikin LED na dogon lokaci.
2.1 Ma'auni na Gabaɗaya Matsakaici (Ts=25°C)
Ba za a taɓa wuce wa waɗannan iyakoki ba, ko da na ɗan lokaci, kamar yadda suke ayyana sharuɗɗan iyaka don aiki mai aminci. Wucewa wa waɗannan ƙimomi na iya haifar da lalacewa ta dindindin.
- Rushewar Wutar Lantarki (PD):1.3W. Wannan shine matsakaicin ƙarfin wutar lantarki da aka canza zuwa zafi a mahadar. Dole ne ƙira ta tabbatar da sarrafa zafin jiki ya sa zazzabin mahadar ya kasance ƙasa da matsakaicinsa.
- Halin Yanzu na Gaba (IF):500mA (mai ci gaba). Ƙimar naɗin bugun jini na iya zama mafi girma amma ba a ƙayyade anan don aiki mai ci gaba ba.
- Ƙarfin Wutar Lantarki na Baya (VR):5V. LEDs suna da ƙarancin ƙarancin karyewar baya. Kariyar kewaye (misali, diode a layi daya) tana da mahimmanci idan ƙarfin wutar lantarki na baya yana yiwuwa.
- Zubar da Wutar Lantarki (ESD):2000V (Samfurin Jikin Mutum). Dole ne a bi ingantattun hanyoyin kulawa na ESD yayin haɗawa.
- Zazzabi na Mahadar (TJ):115°C matsakaici. Babban ƙayyadaddun ƙira; duk ƙirar zafin jiki tana nufin kiyaye TJa matsayin ƙasa kamar yadda zai yiwu a ƙarƙashin yanayin aiki.
- Yanayin Aiki & Ma'ajiya:-40°C zuwa +85°C / -40°C zuwa +100°C.
2.2 Halayen Lantarki da Haskakawa (Ts=25°C, IF=350mA)
Waɗannan sune ƙayyadaddun sigogi na aiki da aka auna ƙarƙashin daidaitattun yanayin gwaji.
- Kololuwar Tsawon Zango (λp):660nm (Na al'ada), tare da kewayon daga 655nm zuwa 670nm. Wannan ƙaƙƙarfan rarrabuwa yana tabbatar da daidaitaccen fitowar bakan haske don ingancin gandun daji.
- Ƙarfin Wutar Lantarki na Gaba (VF):1.8V zuwa 2.6V a 350mA. Dole ne masu ƙira su yi la'akari da wannan bambanci lokacin shirya hanyoyin tuƙi da wadataccen wutar lantarki. Madaidaicin lanƙwasa yana nuna VFyana ƙaruwa tare da halin yanzu da zafin jiki.
- Jimlar Radiant Flux (Φe):230mW zuwa 530mW. Wannan shine jimlar ƙarfin haske da ake fitarwa a cikin bakan haske, ba a auna shi da hankalin idon mutum ba. Ana iya fahimtar inganci daga wannan ƙimar dangane da ƙarfin shigar da wutar lantarki (VF* IF).
- Kusurwar Dubawa (2θ1/2):digiri 30 (Na al'ada). Wannan ƙunƙuntaccen kusurwar katako yana da amfani don jagorantar haske ƙasa akan rufin shuka a cikin aikace-aikacen haske mai mai da hankali.
- Juriya na Thermal (RθJ-S):14°C/W (Na al'ada). Wannan shine juriyar mahadar-zuwa-madaidaicin mahaɗin guduro. Ƙimar ƙasa tana nuna ingantaccen canja wurin zafi daga gwauruwar semiconductor zuwa allon. Tsarin juriyar thermal (mahadar-zuwa-yanayi) zai kasance mafi girma kuma ya dogara da ƙirar PCB (yankin jan ƙarfe, vias) da sanyaya waje.
3. Lanƙwasai na Aiki da Bincike na Hotuna
Lanƙwasan da aka bayar suna ba da mahimman bayanai game da halayen LED a ƙarƙashin yanayin lantarki da zafin jiki daban-daban.
3.1 Ƙarfin Wutar Lantarki na Gaba vs. Halin Yanzu na Gaba (Lanƙwasa na I-V)
Wannan jadawali yana nuna dangantakar da ba ta layi ba. Ƙarfin wutar lantarki na gaba yana ƙaruwa tare da halin yanzu. A shawarar halin yanzu na tuƙi na 350mA, ƙarfin wutar lantarki yakan faɗo tsakanin 2.0V da 2.2V ga yawancin raka'o'i. Masu ƙira suna amfani da wannan lanƙwasa don girman resistors masu iyakancewa ko ƙira daidaitattun tuƙi na yau da kullun.
3.2 Tsananin Dangantaka vs. Halin Yanzu na Gaba
Fitowar gani tana dogara sosai akan halin tuƙi. Lanƙwasa gabaɗaya layi ne a tsakiyar kewayon amma yana iya cika ko samun raguwar inganci a manyan halayen yanzu saboda ƙarin zafi da sauran tasirin semiconductor. Yin aiki a ko ƙasa da 350mA yana tabbatar da ingantaccen fitarwa, mai ƙarfi.
3.3 Tsananin Dangantaka vs. Zazzabi na Mahadar/Madaidaicin Solder
Ingancin LED yana raguwa yayin da zafin jiki ya tashi. Wannan lanƙwasa yana ƙididdige rage darajar zafin jiki. Misali, fitarwa na iya raguwa zuwa 80% na ƙimar sa ta zafin ɗaki lokacin da madaidaicin mahaɗin ya kai 80-90°C. Don haka ingantaccen sarrafa zafin jiki yana da alaƙa kai tsaye da kiyaye fitowar haske da tsawon rai.
3.4 Rarrabawar Bakan
Makircin bakan ya tabbatar da babban kololuwa a ~660nm tare da cikakken faɗin rabin matsakaici (FWHM) na al'ada na kayan semiconductor na AlGaInP. Akwai ƙaramin fitarwa a wasu tsayin zango, yana mai da shi mai tsafta ta bakan don kunnawa na'urar karɓar hasken shuka da aka yi niyya (misali, phytochrome PFR).
3.5 Tsarin Rarraba Hasken Sararin Samaniya
Zanen polar yana nuna kusurwar dubawar digiri 30, yana nuna yadda ƙarfi ya ragu zuwa gefuna na katako. Wannan tsari yana da mahimmanci don ƙididdige daidaiton rarraba haske akan jirgin sama na girma.
4. Girman Injiniya & Bayanin Kunshin
Ƙirar zahiri tana tabbatar da dacewa da haɗawa ta atomatik da ingantattun haɗin guduro.
4.1 Zane-zanen Bayanin Kunshin
LED yana da ƙafar murabba'i tare da girma na 3.00mm ± 0.20mm a kowane gefe da tsayi na 3.08mm ± 0.20mm. Ana gano cathode ta hanyar alama mai alama a saman da babban kafa/thermal kafa a ra'ayin ƙasa. Duban gefe yana nuna tsarin ruwan tabarau a saman kunshin EMC.
4.2 Shafin Solder da Aka Shawarta
An ba da ƙirar ƙirar ƙasa don tabbatar da ingantaccen fillet ɗin solder da haɗin thermal da ya dace. An ƙayyade kafafun anode da cathode, tare da madaidaicin thermal na tsakiya (idan ya dace, ko da yake ba a nuna a fili a cikin ɓangaren da aka cire ba, yana da kowa ga fitilun wutar lantarki). Bin wannan ƙafar yana da mahimmanci don kwanciyar hankali na injiniya da zubar da zafi.
5. Umarnin Solder Reflow na SMT
An tsara wannan na'urar don haɗa fasahar hawa saman ta amfani da manna solder maras gubar.
5.1 Jagororin Tsari
A matsayin ɓangaren Matakin MSL 3, dole ne a gasa na'urar idan an buɗe jakar shinge na danshi fiye da awanni 168 (kwanaki 7) kafin reflow. Yakamata a yi amfani da ingantaccen bayanin martaba maras gubar, tare da matsakaicin zafin jiki bai wuce 260 ° C ba. Bayanin martaba ya kamata ya haɗa da isasshen dumama don kunna juzu'i da rage girgizar zafi, sannan da sarrafa rampa zuwa matsakaicin zafin jiki da sanyaya.
5.2 Kulawa da Kula da Ajiya
Koyaushe kula da LEDs tare da kayan aikin ESD mai aminci da hanyoyin. Ajiye a cikin asali, buɗaɗɗen jakunkuna na shinge na danshi a cikin yanayi da aka sarrafa. Idan ana buƙatar gasa, bi lokacin da zafin jiki da masana'anta suka ba da shawarar (yawanci 125°C na awanni 24). Kauce wa danniya na injiniya akan ruwan tabarau. Kar a tsaftace da masu tsaftacewa na ultrasonic bayan siyarwa, saboda hakan na iya lalata kunshin.
6. Kunshin da Ƙayyadaddun Oda
6.1 Kunshin tef da Reel
Ana samar da samfurin a cikin tef ɗin ɗaukar hoto akan reels don injunan zaɓi da wuri na atomatik. Kowace reel ta ƙunshi guda 2500. Girman tef ɗin mai ɗaukar hoto (girman aljihu, fili) da girman reel (diamita na cibiya, diamita na flange, faɗin) sun yi daidai da daidaitattun jagororin EIA-481 don tabbatar da dacewa da manyan kayan aikin SMT.
6.2 Gwajin Dogaro
Samfurin yana ƙarƙashin gwaje-gwajen amincin daidaitattun don tabbatar da aiki a ƙarƙashin damuwa. Duk da yake ba a lissafta takamaiman yanayin gwaji a cikin ɓangaren da aka cire ba, gwaje-gwajen al'ada ga irin waɗannan fitilun LED sun haɗa da: Rayuwar Aiki mai Zafi (HTOL), Launin Zafi da Danshi (THB), Girgizar Zafi, da gwaje-gwajen solderability. Waɗannan suna tabbatar da ƙarfin samfurin don aikace-aikacen kasuwanci.
7. La'akari da Ƙirar Aikace-aikace
7.1 Tuƙi LED
Koyaushe tuƙi LEDs tare da tushen naɗi na yau da kullun, ba ƙarfin wutar lantarki na yau da kullun ba. Wannan yana tabbatar da ingantaccen fitowar haske da kare LED daga guduwar thermal. Ya kamata a ƙididdige direba don kewayon ƙarfin wutar lantarki na gaba (1.8-2.6V) da halin yanzu na aiki da ake so (misali, 350mA). An fi son duhun Pulse Width Modulation (PWM) akan raguwar naɗi na analog don kiyaye halayen bakan.
7.2 Ƙirar Sarrafa Thermal
Ƙirar thermal ita ce mafi mahimmanci. Yi amfani da juriya na thermal (14°C/W) don ƙididdige hawan zafin jiki daga madaidaicin mahaɗin zuwa mahadar: ΔT = RθJ-S* PD. Ainihin ƙarfin wutar lantarki da aka zubar a matsayin zafi shine PD≈ VF* IF. Ƙirar PCB tare da isasshen yanki na jan ƙarfe da aka haɗa zuwa kafa na thermal ta amfani da hanyoyi masu yawa don yada zafi cikin allon. Don manyan jerin fitilun, yi la'akari da PCB na tsakiyar ƙarfe (MCPCBs) ko sanyaya mai aiki.
7.3 Haɗin Gani
Kusurwar dubawar digiri 30 tana ba da jagora. Don faɗaɗa ɗaukar hoto, ƙila ana buƙatar na'urorin gani na biyu (masu nunawa ko masu watsewa). Lokacin ƙirar kayan haske, yi la'akari da takamaiman ƙayyadaddun yawan photon (PPFD) da ake buƙata na shuke-shuke da aka yi niyya da kuma tsayin ratayewa da ake buƙata don cimma daidaitaccen ɗaukar hoto.
8. Kwatancin Fasaha da Fa'idodi
Idan aka kwatanta da fitilun LED masu faɗi ko fitilun walƙiya don gandun daji, wannan LED mai jajaye mai zurfi yana ba da fa'idodi na musamman:
- Ingancin Bakan:Yana fitar da kusan dukkan makamashinsa a yankin radiation mai aiki na photosynthesis (PAR) wanda shuke-shuke suka fi amfani da shi don photosynthesis, yana rage ɓatanci na makamashi a cikin bakan da ba su da amfani.
- Kula da Phytochrome:Tsawon zango na 660nm musamman yana canza phytochrome zuwa sigar sa mai aiki (PFR), yana ba da damar sarrafa furanni da sauran martanin photomorphogenic.
- Rage Kayan Zafi:Duk da yake ingancin haske yana da girma, ƙunƙuntaccen bakan yana nufin ƙarancin makamashi ana canza shi zuwa infrared mai tsayi (radiation zafi) wanda zai iya yin zafi ga ganyen shuka, idan aka kwatanta da wasu tushe masu faɗin bakan.
- Tsawon Rayuwa:Ingantaccen tuƙi da sanyaya, fitilun AlGaInP LED gabaɗaya suna ba da tsawon rai (L70/B50) fiye da awanni 50,000, da yawa fiye da madadin HPS ko walƙiya.
9. Tambayoyin da ake yawan yi (FAQ)
9.1 Zan iya tuƙi wannan LED a 500mA akai-akai?
Duk da cewa matsakaicin matsakaicin ƙimar shine 500mA, yanayin aikin da aka ba da shawara shine 350mA. Yin aiki a 500mA zai haifar da ƙarin zafi (mafi girman zazzabin mahadar), wanda zai rage inganci (haske/haske mai haske), yana haɗa canjin tsawon zango, da rage tsawon lokacin aiki. Ba a ba da shawarar don amfani da ci gaba ba tare da ingantaccen sarrafa zafin jiki na musamman ba.
9.2 Me yasa tsawon zango 660nm yake da mahimmanci ga shuke-shuke?
Kololuwar sha na chlorophyll yana cikin yankuna ja da shuɗi. Mafi mahimmanci, masu karɓar hasken shuka da ake kira phytochromes suna da hankali ga haske ja (660nm) da haske mai nisa (730nm). Matsakaicin waɗannan tsayin zango yana haifar da hanyoyin ci gaba kamar tsiron iri, tsawaita kara, da furanni. Tushen 660nm yana ba da mahimmin sigina don haɓaka furanni da 'ya'yan itace a yawancin shuke-shuke.
9.3 Ta yaya zan fassara kewayon Jimlar Radiant Flux (230-530mW)?
Wannan yana nuna rarrabuwar samarwa. Fitilun LED masu aiki sama (mafi girman radiant flux) an ware su cikin kwandon daban-daban, sau da yawa suna dacewa da lambobin oda na samfur daban-daban. Masu ƙira yakamata su ƙayyade mafi ƙarancin kwararar da ake buƙata don aikace-aikacensu kuma su zaɓi kwandon da ya dace. Ya kamata ƙirar tsarin ta kasance bisa mafi ƙarancin ƙima don ba da garantin aiki.
9.4 Shin heatsink yana da buƙatu?
Ga LED guda ɗaya a 350mA (yana watsar da kusan 0.7-1W), ingantaccen PCB tare da isasshen jan ƙarfe na iya wadatarwa idan yanayin yanayi ya yi matsakaici. Don jerin fitilun LED ko aiki a cikin yanayin zafi mai girma, kayan sanyaya na musamman da aka haɗe zuwa PCB kusan koyaushe yana da mahimmanci don kiyaye ingantaccen zazzabin mahadar.