Ukwenziwa Kwe-PCB Yekhamera Ye-Drone: Idizayini Ye-High-Frequency Design kanye Nomhlangano Onembile

Isingeniso

I-PCB yekhamera ye-drone isebenza njengesisekelo esibalulekile samakhono wokucabanga kwe-UAV, evumela ukudluliswa kwevidiyo yesikhathi sangempela, ukugwema izithiyo, nokuzulazula okuzenzakalelayo. Izinhlelo zokusebenza zesimanje ze-drone zidinga amamojula ekhamera aletha ukuthwebula kwezithombe ezinencazelo ephezulu kuyilapho egcina izici zefomu elihlangene kanye nokwakhiwa okungasindi.

Ukuhlanganiswa kwezinzwa zesithombe ezinesivinini esikhulu, amasistimu okudlulisa okungenantambo, nokucubungula isignali okuthuthukisiwe kudala izinselele eziyingqayizivele zokukhiqiza. Umzila wesignali we-high-frequency, ukunciphisa ukuphazamiseka kuka-electromagnetic, kanye nokubekezelela ukuhlangana kwe-sub-millimeter kudinga amasu akhethekile okwenziwa kwe-PCB adlula izindlela ezijwayelekile zokukhiqiza ibhodi lesekethe.

Indima Esebenzayo ye-Drone Camera PCB kuma-UAV Systems

I-Signal Integration Architecture

I-PCB yokusebenzelana kwekhamera ixhuma izinzwa zesithombe ze-CMOS kumayunithi okucubungula ngokusebenzisa izivumelwano ezimisiwe ezihlanganisa i-MIPI CSI-2, LVDS, noma izixhumanisi ezihambelanayo. Amasekhethi okuphatha amandla alawula ukunikezwa kwamandla kagesi ekusebenzeni kwenzwa, kuyilapho izigaba ezizinikele zokumisa isignali ziqinisekisa ukudluliswa kwedatha okuhlanzekile kusilawuli sendiza noma iphrosesa engaphakathi.

Ukucutshungulwa Kwedatha Nokudlulisa

Amaphrosesa wesignali yesithombe (ISPs) noma ama-FPGA aphatha ukuthuthukiswa kwesithombe sesikhathi sangempela, ukucindezelwa, nombhalo wekhodi ngokuqondile ku-PCB yombono we-drone. Amamojula ahlanganisiwe angenantambo asebenza ku-2.4GHz noma ku-5.8GHz anika amandla ukwehla kwevidiyo eziteshini zokulawula umhlabathi. I-PCB yokudlulisa isithombe kufanele isekele amanani edatha angaphezu kuka-100Mbps wokusakazwa kwevidiyo ye-HD kuyilapho igcina ubuqotho besignali kukho konke ukuhlukahluka kwezinga lokushisa.

Izidingo Zokuklama Okuvama Kakhulu ze-Drone Camera PCB

Ukuqaliswa Kokulawulwa Kwe-Impedans

Umklamo we-PCB ovame kakhulu wamamojula ekhamera udinga imikhondo ye-impedance elawulwayo ehambisana namanani athile okuqondiwe. Ama-pair ahlukene ezixhumi ze-MIPI ngokuvamile agcina i-impedance engu-100Ω±10%, kuyilapho imigqa yokudlulisa ye-RF enomphetho owodwa idinga ukufana okungu-50Ω. Ukucushwa kwe-stackup enobukhulu be-dielectric obuchaziwe kanye nesisindo sethusi kuqinisekisa i-impedance ehambisanayo kuyo yonke indlela yesignali.

Ukukhetha Okubalulekile Kokusebenza kwe-PCB Yekhamera ye-HD

Izinto ezijwayelekile ze-FR-4 zanele ukusebenzisana kwekhamera ngaphansi kwe-1GHz, kodwa izinhlelo zokusebenza zemvamisa ephezulu ziyazuza kuma-substrate anokulahlekelwa okuncane. I-laminate ekhethekile enokulahlekelwa okuncane noma i-Panasonic Megtron 6 inikeza ukulahlekelwa okuncishisiwe kwe-dielectric (tanδ < 0.004) kanye nama-dielectric constant azinzile kuwo wonke amazinga emvamisa. Lezi zinto ze-PCB zekhamera ye-HD zithinta ngqo ukuncishiswa kwesignali, ikakhulukazi emigqeni yokudlulisela engaphezu kwe-100mm ubude.

Landela Ukucatshangelwa Komzila

Ubude bokufanisa phakathi kwamasignali amapheya ahlukene kugcina ukunemba kwesikhathi sokudluliswa kwedatha efanayo. Ubukhulu bokungafani kobude buhlala bungaphakathi kuka-5mm kuzixhumi ezibonakalayo ze-MIPI ezisebenza ngaphezu kuka-500Mbps. Ngokubeka kudinga ukunakwa okucophelelayo, ngokubhola ngemuva noma ukugqitshwa ngendlela enciphisa ukuzwakala kwe-stub okwehlisa ikhwalithi yesignali.

Ukulawulwa kwe-EMI kanye Nobuqotho Besiginali ku-Drone Camera PCB

I-Ground Plane Architecture

Izindiza eziphelele zomhlabathi ezingqimbeni zangaphakathi zinikeza izindlela zokubuyisa eziphansi ezidingekayo ekwakhiweni kwe-PCB yokulawula i-EMI . Ukuhlukanisa izindiza zomhlabathi kuphazamisa ukugeleza kwamanje okubuyayo futhi kwandisa ukukhishwa kwemisebe. Umklamo we-PCB wobuqotho besignali ugcina izindiza zokubhekisela eziqhubekayo ngaphansi kwemigqa yesivinini esikhulu, kusetshenziswa ama-via amaningi ukuxhuma ugesi neziqhingi zomhlabathi.

I-Differential Pair Symmetry

Ukugcina i-symmetry yejometri ekulandeleleni okuhlukile kunciphisa ukuguqulwa komsindo wemodi evamile. Ububanzi bokulandela umkhondo obufanayo, isikhala, kanye nerediya egobile kuqinisekisa ukubambezeleka kokusabalalisa okunokulinganisela. Noma iyiphi i-asymmetry yethula i-skew enciphisa i-margin yomsindo futhi ikhuphule amathuba okuba sengozini yokuphazanyiswa yi-electromagnetic.

Isu Lokunqamula Ukuhlinzekwa Kwamandla

Ukuhlunga amandla okusebenzayo kumojuli yekhamera ye-PCB kudinga izindlela eziningi:

• Ukubekwa okuseduze - I-Decoupling capacitor ngaphakathi kwe-3mm yezikhonkwane zamandla cindezela umsindo we-high-frequency
• Ukusabalalisa inani le-Capacitor - Amanani amaningi ukusuka ku-100nF kuya ku-10µF isihlungi ku-DC yonkana kuya kububanzi obungu-500MHz
• Izindiza ezinamandla ezizinikele - Izinsiza ezihlukene ze-analog nezedijithali zivimbela ukuphikisana ezigabeni zesignali exubile
• Ukuthululela kwethusi okwasendaweni - Iziqhingi eziphansi ezizungeze amasekhethi azwelayo zinciphisa izindlela zokuxhumanisa umsindo

Izidingo Zomhlangano Wokunemba Zemojuli Yekhamera PCB

Ukunemba Kokubekwa Kwengxenye

Ukuhlanganiswa kwemodyuli yekhamera ye-HD kudinga ukunemba kokubeka ngaphakathi kuka-±25µm kwezingxenye eziqondile. Izinhlelo zokuhlola ze-optical ezizenzakalelayo ziqinisekisa ukubekwa kwengxenye ngaphambi kokugeleza kabusha, ukuthola amaphutha okujikeleza, izikhundla ze-offset, noma ukuqondiswa kwengxenye okungalungile. Amaphakheji ezinzwa zekhamera ane-0.4mm ball pitch BGAs adinga ukwakheka kwephedi okunembile kanye nokusetshenziswa kokunamathisela kwe-solder.

Soldering Process Control

Amaphrofayili okushisa okugeleza kabusha adinga ukulungiselelwa ngokucophelela ukuze avimbele ukulimala okushisayo kuzinzwa zesithombe ngenkathi kuqinisekiswa ukwakheka okunokwethenjelwa kwe-solder. Amazinga okushisa aphezulu ngokuvamile ahlala engaphansi kuka-245°C namazinga erempu alawulwayo angaphansi kuka-3°C/ngesekhondi. Ukwakhiwa kwe-flux engahlanzekile enensalela ephansi kunciphisa ukungcoliswa kwangemva komhlangano okungase kuthinte izingxenye ze-optical noma imigqa yokudlulisa yamaza aphezulu.

Izindlela Zokuqinisekisa Ikhwalithi

Ukuhlolwa kwe-X-ray kwembula ikhwalithi efihliwe yejoyinti le-solder kumaphakheji e-BGA kanye nezingxenye ezifakwe isivikelo. Ukuhlolwa okuzenzakalelayo kwe-optical (AOI) kuqinisekisa ikhwalithi yokufaka phezulu, ukuthola ibhuloho, i-solder enganele, noma umonakalo wengxenye. I-SMT PCB assembly yezinhlelo zokusebenza ze-drone ihlolwa ngogesi ukuqinisekisa ubuqotho besignali ngaphambi kokuhlanganiswa kwe-optical module.

I-Material and Surface Qeda Ukukhetha kwe-Drone Camera PCB

I-Surface Qeda Ukuqhathanisa Ukusebenza

I-ENEPIG (i-Electroless Nickel Electroless Palladium Immersion Gold) inikeza ukuthembeka okuphezulu kokugoqa kanye nokuhambisana kokubopha ucingo uma kuqhathaniswa nokuqedwa okujwayelekile kwe-ENIG. Isendlalelo se-palladium sivimbela izinkinga zokugqwala kwe-nickel ngenkathi sigcina ugesi omuhle kakhulu wokusetshenziswa kwemvamisa ephezulu. I-OSP (i-Organic Solderability Preservative) inikeza izindleko eziphansi kodwa idinga ukugcinwa ngokucophelela ngenxa yokuphila okulinganiselwe kweshelufu kwezinyanga ezingu-6-12.

Ukucatshangelwa kwempahla ye-Dielectric

Ukukhethwa kwempahla yekhamera ye-PCB kulinganisa ukusebenza kukagesi nokuzinza kwemishini kanye nezindleko. I-FR-4 ejwayelekile ene-dielectric constant elawulwayo (Dk = 4.3 ±0.1) inikezela ngezinhlelo zokusebenza eziningi ezingaphansi kuka-2GHz. Amadizayini ama-Ultra-high-frequency adinga izinto ezikhethekile ezine-Dk ezingaphansi kuka-3.5 kanye ne-tangent yokulahlekelwa ngaphansi kuka-0.004 ukuze kugcinwe ubuqotho besignali yezinhlelo zokusebenza zesignali ye-HD ezisebenza ngaphezu kuka-5GHz.

Ukuthembeka kanye Nokujwayela Kwemvelo kwe-Drone Camera PCB

Izindlela Zokuvikela Imvelo

Izinhlelo zokusebenza ze-PCB zokumboza ngokusemthethweni zivikela amamojula ekhamera ahlangene kumswakama, uthuli, nokuchayeka kwamakhemikhali ngesikhathi sokusebenza ngaphandle. Izembatho ze-Acrylic noma ze-urethane zinikeza ukuvikeleka okwanele ngenkathi kugcinwa ukusebenza kabusha ukuze kulungiswe. I-Parylene coating inikezela ngezakhiwo eziphakeme zokuvimbela umswakama ekusetshenzisweni kwemvelo okunokhahlo kodwa kwenza kube nzima ukuguqulwa komhlangano olandelayo.

Amasu okuphatha okushisayo

Amaprosesa esithombe anamandla aphezulu akhiqiza ukushisa okudinga ukusatshalaliswa okuphumelelayo ukuvimbela ukuwohloka kokusebenza. Ukushisa ngama-array kudlulisa ukushisa kusuka kumaphakheji ezingxenye kuya ezindizeni zethusi zangaphakathi noma kuma-heat sink angaphandle. Ukuthembeka kwe-drone PCB kuncike ekugcineni amazinga okushisa e-junction angaphansi kuka-85°C kuwo wonke amabanga okusebenza kusukela ku--20°C kuya ku-+70°C.

I-Mechanical Durability Design

Ukwakhiwa kwe-PCB emelana nokudlidliza kubhekana nokuguquguquka kwendiza okungaguquki kanye nokucindezeleka kwemvelo:

• Amaphoyinti okukhweza aqinisiwe - Ukuqina kwethusi okungeziwe kanye nokwengeziwe ngokusekelwa ezimbotsheni zesikulufa
• Ukujiya kwebhodi elilawulwayo – 1.0-1.6mm ububanzi ezilinganisweni zokuvumelana nezimo nezimfuneko zokuqina
• Ukungagcwalisi kahle kwengxenye - Isicelo se-Epoxy ngaphansi kwe-BGAs kwandisa ukumelana nokukhathala ngo-5-10x
• Ukuhlanganiswa okuguquguqukayo-okuqinile - Ihlukanisa izinzwa zekhamera ekudlidlizeni kwesilawuli sendiza ngenkathi igcina ukuxhumana

Isiphetho

Ukukhiqiza imihlangano ye-PCB yekhamera ye-drone esebenza kahle kudinga ukulawulwa okunembile kobuqotho besignali yemvamisa ephezulu, ukuncishiswa kokuphazamiseka kwe-electromagnetic okuphelele, kanye nokunemba komhlangano weleveli ye-micron. Ukuhlangana kobuchwepheshe bomzila olawulwayo we-impedance, ukukhethwa kwezinto ezithuthukisiwe, nezinqubo zokuhlanganisa eziqinisekisiwe kunquma ukwethembeka nokusebenza kwezinhlelo zesimanje ze-UAV zokucabanga.

Impumelelo incike ekufaniseni amandla okwenziwa nezimfuneko ezithile zemvamisa, ukusebenzisa ukuphathwa okushisayo okufanele, nokugcina ukulawulwa kwekhwalithi okuqinile kukho konke ukukhiqiza.