Ngemishini ye-elekthronikhi, inani elithile lokushisa likhiqizwa ngesikhathi sokusebenza, ukuze izinga lokushisa langaphakathi lemishini likhuphuke ngokushesha.Uma ukushisa kungachithwa ngesikhathi, okokusebenza kuzoqhubeka nokushisa, futhi idivayisi izohluleka ngenxa yokushisa ngokweqile.Ukuthembeka kwemishini kagesi Ukusebenza kuzokwehla.
Ngakho-ke, kubaluleke kakhulu ukuqhuba ukwelashwa okuhle kokukhipha ukushisa ebhodini lesifunda.Ukukhishwa kokushisa kwebhodi lesifunda le-PCB kuyingxenye ebaluleke kakhulu, ngakho-ke iyini inqubo yokukhipha ukushisa yebhodi lesifunda le-PCB, ake sikuxoxe ndawonye ngezansi.
Ukukhipha ukushisa ngebhodi le-PCB ngokwalo Amabhodi e-PCB asetshenziswa kabanzi njengamanje ama-copper clad/epoxy glass cloth substrates noma ama-phenolic resin glass cloth substrates, kanye nenani elincane lamabhodi anezingubo zethusi asekelwe ephepheni.
Nakuba lawa ma-substrates anezakhiwo ezinhle kakhulu zikagesi kanye nezakhiwo zokucubungula, anokukhipha ukushisa okungekuhle.Njengendlela yokukhipha ukushisa yezingxenye zokushisa okuphezulu, cishe akunakwenzeka ukulindela ukushisa okuvela ku-PCB ngokwayo ukuqhuba ukushisa, kodwa ukukhipha ukushisa kusuka ebusweni bengxenye kuya emoyeni ozungezile.
Kodwa-ke, njengoba imikhiqizo ye-elekthronikhi ingene enkathini ye-miniaturization yezingxenye, ukufakwa kwe-high-density mounting, nomhlangano wokushisa okuphezulu, akwanele ukuthembela ebusweni bengxenye enendawo encane kakhulu ukuze kukhishwe ukushisa.
Ngesikhathi esifanayo, ngenxa yokusetshenziswa okukhulu kwezingxenye ze-surface mount ezifana ne-QFP ne-BGA, ukushisa okukhiqizwa yizingxenye kudluliselwa ebhodini le-PCB ngenani elikhulu.Ngakho-ke, indlela engcono kakhulu yokuxazulula ukuchithwa kokushisa ukuthuthukisa amandla okukhipha ukushisa kwe-PCB ngokwayo ethintana ngqo ne-PCB.
▼Isici sokushisa ngokushisa.Kwenziwa noma kukhishwe imisebe.
▼ Ukushisa ngeNgezansi Ukushisa Nge
Ukuvezwa kwethusi ngemuva kwe-IC kunciphisa ukumelana nokushisa phakathi kwethusi nomoya
Isakhiwo se-PCB
Imishini ezwelayo eshisayo ibekwe endaweni yomoya obandayo.
Idivayisi yokuthola izinga lokushisa ibekwe endaweni eshisa kakhulu.
Amadivayisi ebhodini elifanayo eliphrintiwe kufanele ahlelwe ngokusemandleni akho ngokuvumelana nenani le-calorific kanye nezinga lokukhipha ukushisa.Amadivayisi anevelu ye-calorific ephansi noma ukumelana nokushisa okungekuhle (njengama-transistors wesignali amancane, amasekhethi ahlanganisiwe ezinga elincane, ama-electrolytic capacitor, njll.) kufanele abekwe ekugelezeni komoya okupholisayo.Ukugeleza okuphezulu kakhulu (ekungeneni), izisetshenziswa ezinokushisa okukhulu noma ukumelana nokushisa (njengama-transistors amandla, amasekhethi amakhulu ahlanganisiwe, njll.) abekwe endaweni ephansi kakhulu yokugeleza komoya okupholisa.
Esiqondisweni esivundlile, amadivaysi anamandla aphezulu abekwe eduze nomkhawulo webhodi eliphrintiwe ngangokunokwenzeka ukuze unciphise indlela yokudlulisa ukushisa;endaweni eqondile, amadivaysi anamandla aphezulu abekwe eduze nangaphezulu kwebhodi eliphrintiwe ngangokunokwenzeka ukuze kuncishiswe umthelela wale mishini ekushiseni kwamanye amadivaysi .
Ukuchithwa kokushisa kwebhodi eliphrintiwe kumishini ngokuyinhloko kuncike ekugelezeni komoya, ngakho-ke indlela yokuhamba komoya kufanele ifundwe ngesikhathi sokuklama, futhi idivayisi noma ibhodi lesifunda eliphrintiwe kufanele lilungiselelwe ngokunengqondo.
Lapho umoya ugeleza, uvame ukugeleza ezindaweni ezinokumelana okuphansi, ngakho-ke lapho ulungiselela amadivaysi ebhodini lesifunda eliphrintiwe, gwema ukushiya indawo yomoya enkulu endaweni ethile.Ukumiswa kwamabhodi esekethe aphrintiwe amaningi kuwo wonke umshini kufanele futhi kunake inkinga efanayo.
Idivayisi engezwani nezinga lokushisa ibekwe kahle endaweni enezinga lokushisa eliphansi kakhulu (njengaphansi kwedivayisi).Ungalokothi uyibeke ngaphezu kwedivayisi yokushisisa.Kungcono ukunyakazisa amadivaysi amaningi endizeni evundlile.
Amadivayisi asebenzisa amandla aphezulu kanye nokukhiqiza ukushisa ahlelwa eduze nendawo engcono kakhulu yokukhipha ukushisa.Ungabeki izinto zokushisisa okuphezulu emakhoneni nasemaphethelweni aseduze ebhodi eliphrintiwe, ngaphandle uma kuhlelwe isinki sokushisa eduze kwayo.
Lapho uklama isivimbeli samandla, khetha idivayisi enkulu ngangokunokwenzeka, futhi uyenze ibe nesikhala esanele sokulahla ukushisa lapho ulungisa ukwakheka kwebhodi eliphrintiwe.
Isikhala sezingxenye esinconyiwe: