Umngxunya okhulayo ngaphakathi PCB yinto ebalulekileyo kuyilo lwe-elektroniki. Wonke umyili PCB uya kuyiqonda injongo PCB imingxunya nokunyuka kunye noyilo esisiseko. Kwakhona, xa umngxunya onyukayo uqhagamshelwe emhlabeni, ezinye iingxaki ezingeyomfuneko zingagcinwa emva kofakelo.

Indlela yokusebenzisa imingxunya PCB ukunciphisa EMI?

Njengoko igama libonisa, imingxunya yokufaka i-PCB inceda ukukhusela i-PCB kwizindlu. Nangona kunjalo, oku kukusetyenziswa koomatshini ngokwasemzimbeni, ukongeza ekusebenzeni kwe-electromagnetic, imingxunya yokufaka i-PCB inokusetyenziselwa ukunciphisa ukuphazamiseka kwe-electromagnetic (EMI). Ii-PCBS ze-Emi-sensitive zihlala zihlala kwiindawo ezivalekileyo zentsimbi. Ukunciphisa ngokufanelekileyo i-EMI, imingxunya yokufaka i-PCB kufuneka iqhagamshelwe emhlabeni. Emva kweli khaka lisezantsi, nakuphi na ukuphazamiseka kombane kuya kuthunyelwa ukusuka kwindawo ebiyelweyo yentsimbi emhlabeni.

Indlela yokusebenzisa imingxunya PCB ukunciphisa EMI? Kutheni unxibelelwano lomhlaba lubalulekile?

Umbuzo oqhelekileyo obuzwe ngumyili we-avareji omtsha ngowuphi umhlaba odibanisa kuwo? Kwizixhobo eziqhelekileyo zombane, kukho imiqondiso, iziseko zezindlu kunye nomhlaba. Njengomthetho wesithupha, musa ukuqhagamshela imingxunya enyukayo ukubonisa umhlaba. Umhlaba wophawu ngumhlaba ekubhekiswa kuwo kwizinto ze-elektroniki kuyilo lwesekethe yakho, kwaye ukwazisa ukuphazamiseka kwe-electromagnetic kuyo ayisiyongcamango ilungileyo.

Into ofuna ukuyidibanisa yimeko esezantsi. Kulapho lonke unxibelelwano lomhlaba lwekhabhinethi luyahlangana. Isiseko seChassis kufuneka sidityaniswe kwinqanaba elinye, ngokukhethekileyo ngonxibelelwano lweenkwenkwezi. Oku kuthintela ukubangela ii-loops zomhlaba kunye nonxibelelwano oluninzi lomhlaba. Ukuqhagamshela umhlaba okuninzi kunokubangela umahluko ombane omncinci kwaye kubangele ukuba kungoku kuhamba phakathi kwesiseko se-chassis. I-chassis emva koko ibekwa emhlabeni ukulungiselela amanyathelo okhuseleko.

Kutheni le nto kubalulekile ukuba unxibelelwano olufanelekileyo lomhlaba?

Ukuba isiseko seqokobhe lebhodi ye-PCB yigobolondo lesinyithi, ke lonke iqokobhe lesinyithi ngumhlaba. Ucingo lomhlaba lwamandla angama-220V luqhagamshelwe emhlabeni. Zonke izinto zokudibanisa kufuneka zidityaniswe nomhlaba, kwaye izikere zezinto kufuneka zixhunywe emhlabeni. In this way, incoming interference in EMC testing is discharged directly from the ground to the ground without interfering with the internal system. Ukongeza, izixhobo zokukhusela i-EMC kufuneka zinonxibelelwano ngalunye, kwaye kufuneka zikufutshane nonxibelelwano.

Ukuba yimeko yeplastiki, kungcono ukuba isitya sensimbi sifakwe kuyo. Ukuba akukho ndlela yakufezekisa, kuya kufuneka ukuba uqwalasele ngakumbi kulwakhiwo lwe-wiring, uphawu olubuthathaka (iwotshi, ukuseta kwakhona, i-crystal oscillator, njl. , ukunikezwa Amandla).

Ukudibanisa imingxunya yokufaka imingxunya kumgangatho we-chassis yeyona ndlela ilungileyo, kodwa ayisiyiyo kuphela indlela efanelekileyo yokulandela. Ukuqinisekisa ukuba isixhobo sakho sikhuselwe, isiseko sakho se-chassis kufuneka siqhagamshelwe kwisiphelo esifanelekileyo sendlela. Umzekelo, ukuba wakha umatshini wentlawulo yokupaka ongazinzanga ngokufanelekileyo, unokuba nabathengi bekhalaza “ngombane” xa uhlawula. Oku kunokwenzeka xa umthengi ethinta indawo engavaliyo yentsimbi yendawo ebiyelweyo.

Umothuko ophantsi wombane unokwenzeka kwakhona xa isisombululo semoto yekhompyuter singasekelwanga kakuhle. Oku kunokwenzeka kwakhona xa iintambo zomhlaba ezidibanisa iindawo zombane kumgangatho wesakhiwo ziye zacinywa. Oku kungakhokelela kumhlaba odadayo kumatshini ohambelana nawo.

Umgaqo wokukhusela i-EMI kuxhomekeke kunxibelelwano olufanelekileyo lomhlaba. Unxibelelwano lomhlaba odadayo aluvezi nje umthengi wakho kumothuso wombane omncinci, kodwa unokubeka esichengeni ukhuseleko lomthengi wakho ukuba isixhobo sakho sifutshane. Njengoko kubonisiwe kulo mzobo ungezantsi, ukuzinza ngokufanelekileyo kubalulekile kukhuseleko kunye nokukhuselwa kwe-EMI.

Iindlela ezisisiseko zokuyila imingxunya yokunyuka kwePCB

Imingxunya yokukhwela ye-PCB ihlala isetyenziswa kuyilo. Kukho imigaqo embalwa elula esisiseko xa kufikwa kwimingxunya yokunyuka. Okokuqala, nikela ingqalelo uququzelelo imingxunya obandayo. Impazamo apha iya kubangela ukuba i-PCB yakho ingafakwanga ngokuchanekileyo kwizindlu zayo. Qiniseka ukuba umngxunya onyukayo bubungakanani obufanelekileyo besikrufu osikhethileyo.

Isoftware yoyilo olukhulu, efana nesoftware yokulandelelana kweAltium, inokubeka ngokuchanekileyo imingxunya kwaye ichaze imigaqo enxulumene nokushiyeka okukhuselekileyo. Musa ukubeka imingxunya yokunyusa kude kakhulu kumda we-PCB. Izinto ezincinci ze-dielectric kwimiphetho zinokubangela iintanda kwi-PCB ngexesha lofakelo okanye lokudiliza. Kuya kufuneka ushiye indawo eyoneleyo phakathi kwemingxunya enyukayo kunye nezinye iindawo.