Uphando kunye nophuhliso lokutshintsha umbane, Uyilo PCB ithatha indawo ebaluleke kakhulu. A bad PCB has poor EMC performance, high output noise, weak anti-interference ability, and even basic functions are defective.

Kancinci ngokwahlukileyo kwezinye ii-PCBS zehardware, ukutshintsha amandla kwePCBS baneempawu ezizezabo. Eli nqaku liza kuthetha ngokufutshane malunga neminye imigaqo esisiseko ye-wiring ye-PCB yokutshintsha umbane ngokusekwe kumava obunjineli.

1, isithuba

Isithuba somgca kufuneka sithathelwe ingqalelo kwiimveliso zombane ophezulu. Isithuba esinokuhlangabezana neemfuno zemigaqo yokhuseleko ehambelanayo yeyona ilungileyo, kodwa amaxesha amaninzi kwiimveliso ezingasifuniyo isiqinisekiso, okanye ezingafezekisi isatifikethi, isithuba simiselwa ngamava. Bobuphi ububanzi bezithuba obufanelekileyo? Kuya kufuneka uthathele ingqalelo imveliso nokuba uqinisekise ukucoceka kwebhodi yomphezulu, ukufuma kwendalo, nolunye ungcoliseko linda imeko njani.

For the mains input, even if the board surface can be guaranteed clean and sealed, MOS tube drain source electrode close to 600V, less than 1mm is actually more dangerous!

2. Izinto ezisecaleni kwebhodi

For the patch capacitance or other easily damaged devices at the edge of PCB, the PCB splitter direction must be taken into consideration when placing. The figure shows the comparison of the stress on the devices under various placement methods.

IKHIWANE. 1 Thelekisa uxinzelelo kwisixhobo xa ipleyiti yahlulwe

Kuyabonakala ukuba isixhobo kufuneka sikude kwaye sihambelane nomda wokuqhekeka, kungenjalo icandelo linokonakaliswa ngenxa yokuchithwa kwe-PCB.

3. Indawo yelupha

Whether input or output, power loop or signal loop, should be as small as possible. Isitshixo samandla sikhupha ifildi yombane, eya kuthi ikhokelele kwiimpawu ze-EMI ezihlwempuzekileyo okanye ingxolo enkulu yokuphuma; At the same time, if received by the control ring, it is likely to cause an exception.

Kwelinye icala, ukuba indawo yeluphu yamandla inkulu, i-parasitic inductance efanayo iya kwanda, enokuthi inyuse isandi sokuphakama kwengxolo.

4. Iingcingo eziphambili

Ngenxa yesiphumo se-DI / DT, ukunyanzeliswa kwe-node eguqukayo kufuneka kuncitshiswe, kungenjalo umhlaba uya kuba namandla. Ukuba ufuna ukunciphisa ukungasebenzi, ngokusisiseko ufuna ukunciphisa ubude beentambo, ukonyusa inyathelo lobubanzi lincinci.

5. Iintambo zemiqondiso

Lonke icandelo lolawulo, ingqalelo kufuneka inikwe kwintambo kude necandelo lamandla. Ukuba ezi zimbini zisondelelene ngenxa yolunye uthintelo, umgca wolawulo kunye nelayini yamandla akufuneki zihambelane, kungenjalo kunokukhokelela ekusebenzeni ngokungaqhelekanga kombane, ukothuka.

In addition, if the control line is very long, a pair of back and forth lines should be close to each other, or the two lines should be placed on the two sides of the PCB facing each other, so as to reduce the loop area and avoid interference by the electromagnetic field of the power part. IKHIWANE. 2 ibonisa iindlela ezichanekileyo nezingachanekanga zokuhamba ngomzila phakathi kuka-A no-B.

Umzobo 2 iindlela ezichanekileyo nezingalunganga zendlela yentambo.

Ewe kunjalo, umgca wesiginali kufuneka unciphise unxibelelwano ngemingxunya!

6, ubhedu

Ngamanye amaxesha ukubeka ubhedu akufuneki kwaphela kwaye kufuneka kuthintelwe. Ukuba ubhedu lwalulukhulu ngokwaneleyo kwaye iivolthi zalo zahlukile, inokuthi isebenze njenge-eriyali, ikhuphe amaza ombane ajikeleze yona. Kwelinye icala, kulula ukukhetha ingxolo.

Ngokubanzi, ukubekwa kobhedu kuvunyelwe kuphela kwiindawo ezi-static, ezinjenge “node” yomhlaba kwisiphelo sesiphumo, esinokuthi sandise ngokufanelekileyo amandla emveliso kunye nokucoca imiqondiso ethile yengxolo.

7, ukwenza imephu,

Kwisekethe, ubhedu lunokubekwa kwelinye icala le-PCB, ethi izenzele yona ngokuzenzekelayo kwi-wiring kwelinye icala le-PCB ukunciphisa ukunganyanzeleki kwesekethe. Ingathi iseti yezithintelo ezinamaxabiso ahlukeneyo e-impedance aqhagamshelwe ngokufanayo, kwaye okwangoku kuya kukhetha ngokuzenzekelayo umendo kunye nesithintelo esisezantsi sokuhamba.

Ngokwenyani ungayibamba inxenye yolawulo lwesekethe kwelinye icala, kwaye ubeke ubhedu kwindawo “yomhlaba” kwelinye icala, kwaye uqhagamshele macala omabini ngomngxuma.

Isiphumo sokulungisa kwakhona idayidi

Ukuba i-diode yokulungisa imveliso ikufutshane nemveliso, akufuneki ibekwe ngokuhambelana nemveliso. Ngaphandle koko, intsimi ye-electromagnetic eyenziwe kwi-diode iya kungena kwi-loop eyenziwe ngumbane kunye nomthwalo wangaphandle, ukwenzela ukuba isandi sokulinganisa siphumelele.

IKHIWANE. 3 Ukubekwa ngokuchanekileyo nokungachanekanga kweedayidi

9, ucingo lomhlaba,

Iingcingo zeentambo zomhlaba kufuneka zilumke kakhulu. Ngaphandle koko, i-EMS, i-EMI kunye nokunye ukusebenza kunokuwohloka. Ukutshintshela umbane we-PCB “emhlabeni”, ubuncinci la manqaku mabini alandelayo: (1) amandla ombane kunye nomhlaba womqondiso, kufuneka unxibelelaniso lwendawo enye; (2) Akufanele kubekho mhlaba womhlaba.

10. Amandla omsebenzi

Igalelo kunye nemveliso zihlala zixhunywe kwi-Y capacitor, ngamanye amaxesha ngenxa yezizathu ezithile, isenokungakwazi ukuxhoma kumhlaba wokufaka we-capacitor, khumbula ngeli xesha, kufuneka idityaniswe kwi-node emileyo, efana nesiphelo sevolthi ephezulu.

11, enye

Xa uyila i-PCB yonikezelo lwamandla, inokubakho eminye imiba ekufuneka uyiqwalasele, enje nge “varistor kufuneka ibe kufutshane nesekethe ekhuselweyo”, yandisa i-capacitor ”njalo njalo. Ukongeza, isidingo sonyango olukhethekileyo, olunje ngefoyile yobhedu, ukukhusela, njl njl.

Ngamanye amaxesha bahlala bedibana nenqwaba yemigaqo engqubanayo, ukuhlangabezana nenye yazo ayinakho ukuhlangabezana nenye, sisidingo sokuba iinjineli zisebenzise amava akhoyo, ngokweemfuno zeprojekthi, zichonge ezona ntambo zilungileyo!