Kukho imithetho yoyilo yePCB emininzi. Oku kulandelayo ngumzekelo wesithuba sokhuseleko lombane. Ukusetwa komgaqo wombane yibhodi yesekethe yoyilo kwi-wiring kufuneka ihambisane nemithetho, kubandakanya umgama wokhuseleko, isekethe evulekileyo, isethingi yesekethe emfutshane. Ukusetwa kwezi parameters kuya kuchaphazela iindleko zemveliso, ubunzima boyilo kunye nokuchaneka koyilo lwePCB eyiliweyo, kwaye kufuneka iphathwe ngokungqongqo.
1.Imithetho yoCwangciso
Uyilo lwe-PCB lunesithuba sothungelwano olufanayo, isithuba sokhuseleko lwenethiwekhi eyahlukileyo, enye, ububanzi bomgca kufuneka bubekwe, ububanzi bomgca ongagqibekanga kunye nesithuba yi-6mil, isithuba esingagqibekanga yi-6mil, ububanzi bomgca obuncinane bubekwe kwi-6mil, ixabiso elicetyiswayo ( ububanzi bocingo olungagqibekanga) lubekwe kwi-10mil, ubuninzi bubekwe kwi-200mil. Izicwangciso eziKhethekileyo ngokobunzima bebhodi yokumisela i-wiring.
Ububanzi bomgca obekiweyo kunye nesithuba kufuneka kwakhona kuthethathethwane nomvelisi PCB kwangaphambili, kuba abanye abavelisi basenokungakwazi ukufikelela umgca omiselweyo ububanzi kunye nesithuba ngenxa yengxaki umthamo inkqubo, kwaye incinci ububanzi umgca kunye nesithuba; ixabiso eliphezulu.
2.Isithuba somgca 3W umthetho
Zonke ziyilelwe kumgca wewotshi, umgca wokuhlula, ividiyo, iaudio, umgca wokusetha kwakhona kunye neminye imigca ebalulekileyo yenkqubo. Xa iingcingo zomqondiso wesantya esiphezulu zihamba imigama emide, ukuze kuncitshiswe intetho enqamlezileyo phakathi kwemigca, isithuba somgca kufuneka sibe sikhulu ngokwaneleyo. Xa isithuba seziko lomgca singekho ngaphantsi kwamaxesha ama-3 ububanzi bomgca, iindawo ezininzi zombane azikwazi ukuphazamisana, oko kukuthi umgaqo we-3W. Umgaqo we-3W ugcina i-70% yamasimi ekuphazamiseni omnye nomnye, kunye ne-10W yezithuba, i-98% yemimandla inokufezekiswa ngaphandle kokuphazamisana.
Umgaqo we-3.20H woluhlu lwamandla
Umgaqo we-20H ubhekiselele kumgama we-20H phakathi komgangatho wokunikezelwa kwamandla kunye nokwakheka, okuqinisekileyo ukuthintela umphumo we-radiation edge. Ngenxa yokuba indawo yombane ephakathi komaleko wamandla nomhlaba iyatshintsha, uphazamiseko lwe-electromagnetic luya kuphuma ngaphandle emphethweni wepleyiti, ebizwa ngokuba yi-edge effect. Isisombululo kukunciphisa umaleko wonikezelo lwamandla ukwenzela ukuba indawo yombane idluliselwe kuphela kuluhlu lomhlaba. Nge-H enye (ubukhulu bendawo ephakathi phakathi komthombo wamandla kunye nomhlaba) njengeyunithi, i-70% yendawo yombane inokuvalelwa ekupheleni komhlaba kunye ne-contraction ye-20H, kunye ne-98% yendawo yombane. uvaleleke ngokufinyezwa kwe-100H.
4.Impembelelo ye-impedance line space
Isakhiwo esiyinkimbinkimbi solawulo lwe-impedance olubandakanya imigca yemiqondiso emibini eyahlukileyo. Iimpawu zegalelo ekupheleni komqhubi zimbini ze-waveforms ze-polarity ezichaseneyo, ngokulandelelana zihanjiswa yimigca emibini yokwahlula, kunye neempawu ezimbini ezihlukeneyo ekupheleni kommkeli zithatyathwa. Le ndlela isetyenziswa ikakhulu kwiisekethe ze-analog zedijithali ezikhawulezayo zokuqinisekisa ingqibelelo yophawu olungcono kunye nokumelana nengxolo. I-impedance ilingana nokwahluka kwezithuba zomgca, kwaye okukhona kukho isithuba somgca umahluko, kokukhona i-impedance inkulu.
5. Umgama we-creepage wombane
Ukucocwa kombane kunye nomgama ohambahambayo kubaluleke ngakumbi kuyilo lwePCB lonikezelo lwamandla ombane aphezulu okutshintsha. Ukuba ukukhutshwa kombane kunye nomgama we-creepage uncinci kakhulu, kuyimfuneko ukubeka ingqalelo kwimeko yokuvuza. Isithuba seCreepage kunye nesikhewu sombane Ngexesha loyilo lwePCB, isithuba sombane sinokuhlengahlengiswa ngokulungelelanisa isithuba ukusuka kwiphedi ukuya kwipadi. Xa isithuba sePCB siqinile, isithuba se-creepage sinokunyuswa ngokukrolwa.
