Isantya esiphezulu sePCB ukulungisa. Nayi imigaqo esithoba:

Umgaqo 1: Umgaqo wokukhusela isantya esiphezulu

Kuyilo olukhawulezayo lwePCB, imigca yesitshixo esineempawu ezikhawulezayo ezinje ngeewotshi kufuneka zikhuselwe. Ukuba azikhuselwanga okanye azikhuselwanga ngokuyinxenye, ukuvuza kwe-EMI kuya kubangelwa. Kuyacetyiswa ukuba iintambo ezikhuselweyo zombiwe zokumisa yonke i-1000mil.

Umgaqo 2: imigaqo evaliweyo yokuhamba kwemiqondiso yesantya esiphezulu

Imigaqo evaliweyo yokuhamba kwemiqondiso yesantya esiphezulu

Yeyiphi imigaqo ye-EMI yoyilo olukhawulezayo lwePCB

Imigaqo evaliweyo yokuhamba kwemiqondiso yesantya esiphezulu

Ngenxa yoxinzelelo olwandayo lwebhodi ye-PCB, iinjineli ezininzi ze-PCB LAYOUT zithambekele ekwenzeni impazamo kwinkqubo ye-wiring. Ngamanye amagama, inethiwekhi yesantya esiphezulu enjengewotshi yewotshi evelisa iziphumo zomtya ovaliweyo xa kufakwa ii-multi-layer PCB wiring. Iziphumo ezivaliweyo zelaptop ziya kuvelisa i-eriyali yeringi kwaye zonyuse amandla emitha ye-EMI.

Umgaqo 3: imigaqo evulekileyo yokuhamba kwemiqondiso yesantya esiphezulu

Imigaqo evulekileyo yokuhamba kwemiqondiso yesantya esiphezulu

Yeyiphi imigaqo ye-EMI yoyilo olukhawulezayo lwePCB

Imigaqo evulekileyo yokuhamba kwemiqondiso yesantya esiphezulu

Umgaqo 2 ukhankanye ukuba ivali evaliweyo yesantya esiphezulu iya kubangela i-EMI radiation, ngelixa i-loop evulekileyo iya kubangela nemitha ye-EMI.

Inethiwekhi yenethiwekhi yesantya esiphezulu, njengophawu lwewotshi, nje ukuba iziphumo zokuvula okuvulekileyo zenziwe kulungelelwaniso lwePCB eyahlukeneyo, i-eriyali yomgama iya kwenziwa kunye nokuqina kwemitha ye-EMI kuya kwandiswa.

Umgaqo 4: uphawu lokuqhubela phambili ngokunyanzelwa kwemiqondiso yesantya esiphezulu

Ukuqhubekeka komgaqo wokuqhubekeka kwemiqondiso yesantya esiphezulu

Yeyiphi imigaqo ye-EMI yoyilo olukhawulezayo lwePCB

Ukuqhubekeka komgaqo wokuqhubekeka kwemiqondiso yesantya esiphezulu

Kwimiqondiso yesantya esiphezulu, ukuqhubekeka kweempawu zempawu kufuneka kuqinisekiswe xa kutshintshwa phakathi kwamanqanaba; Ngaphandle koko, i-EMI radiation iya kwandiswa. Oko kukuthi, ububanzi beentambo zoluhlu olufanayo kufuneka luqhubeke, kwaye ukungqinelana kweentambo kweendlela ezahlukeneyo kufuneka kuqhubeke.

Umgaqo 5: Imigaqo yokuhambisa umkhombandlela kuyilo olukhawulezayo lwePCB

Ukuqhubekeka komgaqo wokuqhubekeka kwemiqondiso yesantya esiphezulu

Yeyiphi imigaqo ye-EMI yoyilo olukhawulezayo lwePCB

Iintambo eziphakathi kwamanqanaba amabini akufutshane kufuneka zihanjiswe ngokuthe nkqo. Ngaphandle koko, i-crosstalk inokwenzeka kwaye i-EMI radiation inokunyuka. Ngamafutshane, ii-wiring ezikufutshane zilandela ulungelelwaniso lwe-wiring ethe tye, ethe tye kwaye ethe nkqo, kwaye ii-wiring ezithe nkqo zinokucinezela i-crosstalk phakathi kwemigca.

Umgaqo 6: Imithetho yeTopology kuyilo olukhawulezayo lwePCB

Yeyiphi imigaqo ye-EMI yoyilo olukhawulezayo lwePCB

Ukuqhubekeka komgaqo wokuqhubekeka kwemiqondiso yesantya esiphezulu

Kuyilo lwe-PCB olukhawulezayo, ulawulo lwebhodi yesekethe impedance kunye noyilo lobume be-topological phantsi komthwalo omninzi ngokuthe ngqo lubonisa impumelelo okanye ukusilela kwemveliso.

I-topy ye-daisy ye-topology ibonakalisiwe kulo mzobo, uluncedo ngokubanzi kwi-Mhz ezimbalwa. Kuyacetyiswa ukuba kusetyenziswe ubume beenkwenkwezi macala kwinqanaba elingasemva kuyilo lwe-PCB olukhawulezayo.

Umgaqo 7: Umgaqo we-Resonance wobude bomgca

Umgaqo we-Resonance wobude bomgca

Yeyiphi imigaqo ye-EMI yoyilo olukhawulezayo lwePCB

Umgaqo we-Resonance wobude bomgca

Jonga ukuba ubude bomgca wesiginali kunye nobuninzi besiginali benza isandi, oko kukuthi xa ubude bokubamba iintambo kungamaxesha apheleleyo omqondiso wobude be-1/4, le wiring iya kuvelisa isandi, kwaye isandi siza kubhengeza amaza ombane, ukuvelisa ukuphazamiseka.

Umgaqo 8: Umgaqo wendlela yokubuyela umva

Umgaqo wendlela yokubuyela umva

Yeyiphi imigaqo ye-EMI yoyilo olukhawulezayo lwePCB

Umgaqo wendlela yokubuyela umva

Zonke iimpawu ezikhawulezayo kufuneka zibe nendlela yokuhamba kwakhona. Nciphisa umendo wokubuya kweempawu zesantya esiphezulu ezinje ngeewotshi. Ngaphandle koko i-radiation iyonyuka kakhulu, kwaye inani lemitha liyalingana nendawo ejikelezwe ngumqondiso wendlela kunye nendlela yokubuyela umva.

Umgaqo 9: Imigaqo yokubekwa kwesixhobo sokucoca isixhobo sokuhlaziya

Imigaqo yokubeka izixhobo zokudibanisa izixhobo

Yeyiphi imigaqo ye-EMI yoyilo olukhawulezayo lwePCB

Imigaqo yokubeka izixhobo zokudibanisa izixhobo

Indawo ekuyo i-decoupling capacitor ibaluleke kakhulu. Ubeko olungalunganga alunakho ukufikelela kwisiphumo sokudityaniswa. Umgaqo: kufutshane nepini yokuhambisa umbane, kunye nokuhambisa umbane we-capacitor kunye nomhlaba ojikelezwe yeyona ndawo incinci.