Uyilo lwe-EMC kwi Ibhodi PCB kufuneka ibe yinxalenye yoyilo olubanzi lwaso nasiphi na isixhobo sombane kunye nenkqubo, kwaye ineendleko ezingaphezulu lee kunezinye iindlela ezizama ukwenza imveliso ifikelele kwi-EMC. Itekhnoloji ephambili yoyilo lokuhambelana kwe-electromagnetic kuphononongo lwemithombo yokuphazamiseka kwe-electromagnetic. Ukulawula ukukhutshwa kwe-electromagnetic kwimithombo yokuphazamiseka kwe-electromagnetic sisisombululo esisisigxina. Ukulawula ukukhutshwa kwemithombo yokuphazamiseka, ukongeza ekunciphiseni inqanaba lengxolo ye-electromagnetic eveliswa yindlela yokuphazamiseka kwemithombo ye-electromagnetic, ukukhusela (kubandakanya ukubekwa wedwa), ukuhluza, kunye netekhnoloji yokumisa kufuneka isetyenziswe ngokubanzi.

Obona buchule buphambili boyilo lwe-EMC bubandakanya iindlela zokukhusela i-electromagnetic, iindlela zokucoca isekethe, kunye nengqalelo ekhethekileyo kufuneka ihlawulwe kuyilo olusisiseko lwento esezantsi egqitheneyo.

Enye, iphiramidi yoyilo ye-EMC kwibhodi yePCB
Umzobo we-9-4 ubonisa indlela ecetyiswayo yoyilo lwe-EMC olungcono lwezixhobo kunye neenkqubo. Le yigrafu yephiramidi.

Okokuqala, isiseko soyilo lwe-EMC elungileyo kukusetyenziswa kwemigaqo elungileyo yombane kunye noyilo lomatshini. Oku kubandakanya iingqwalasela zokuthembeka, ezinje ngeenkcukacha zoyilo lwentlanganiso ngaphakathi kokunyamezela okwamkelekileyo, iindlela ezilungileyo zokuhlanganisa, kunye neendlela ezahlukeneyo zovavanyo eziphantsi kophuhliso.

Ngokubanzi, izixhobo eziqhuba izixhobo zombane zanamhlanje kufuneka zixhonywe kwiPCB. Ezi zixhobo zenziwe ngamacandelo kunye neesekethe ezinemithombo enokubakho yokuphazamiseka kwaye zinovakalelo kumbane wombane. Ke ngoko, uyilo lwe-EMC yePCB ngowona mba ubalulekileyo ulandelayo kuyilo lwe-EMC. Indawo yamacandelo asebenzayo, ukuhanjiswa kwemigca eprintiweyo, ukuhambelana kwe-impedance, uyilo lomgangatho, kunye nokucoca isekethe kufuneka zonke ziqwalaselwe ngexesha loyilo lwe-EMC. Amanye amacandelo ePCB nawo kufuneka akhuselwe.

Okwesithathu, iintambo zangaphakathi zisetyenziswa ngokubanzi ukuqhagamshela iiPCB okanye ezinye iinxalenye zangaphakathi. Ke ngoko, uyilo lwe-EMC yentambo yangaphakathi kubandakanya indlela yokuhambisa kunye nokukhusela kubaluleke kakhulu kwi-EMC iyonke yaso nasiphi na isixhobo.

Uluqhuba njani uyilo lwe-EMC kwibhodi yePCB?

Emva koyilo lwe-EMC yePCB kunye noyilo lwangaphakathi lwekhebula lugqityiwe, ingqwalasela ekhethekileyo kufuneka ihlawulwe kuyilo lokukhusela i-chassis kunye neendlela zokucubungula zonke izikhewu, i-perforations kunye nekhebula ngokusebenzisa imingxuma.

Ekugqibeleni, kufuneka kwakhona kugxininise kwigalelo kunye nonikezelo lwamandla ombane kunye neminye imiba yokucoca intambo.

2. Ukhuselo lombane
Ukukhusela ikakhulu kusetyenziswa izinto ezahlukeneyo zokuqhuba, zenziwe kumaqokobhe ahlukeneyo kwaye ziqhagamshelwe emhlabeni ukusika indlela yokusasaza ingxolo yombane eyenziwe ludibaniso lwe-electrostatic, ukudibanisa inductive okanye ukudibanisa intsimi ye-electromagnetic field. Ukwahlukaniswa ikakhulu kusetyenziswa iireyilayi, iinguqu zodwa okanye i-photoelectric Isolators kunye nezinye izixhobo zokunqumla indlela yokusasaza ingxolo ye-electromagnetic ngendlela yokuqhuba ziphawulwa ngokwahlula inkqubo yomhlaba yamacandelo amabini esekethe kunye nokunqunyulwa kwamathuba okudibanisa. ukungaphumeleli.

Ukusebenza komzimba okhuselayo kubonakaliswa ngokusebenza kokukhusela (SE) (njengoko kuboniswe kuMfanekiso 9-5). Ukusebenza kokhuselo kuchazwa ngolu hlobo:

Uluqhuba njani uyilo lwe-EMC kwibhodi yePCB?

Ubudlelwane phakathi kokusebenza kokhuselo lwe-electromagnetic kunye nokuthomalalisa amandla entsimi zidweliswe kwiThebhile 9-1.

Uluqhuba njani uyilo lwe-EMC kwibhodi yePCB?

Okukhona kuphezulu ukusebenza kokhuselo, kokukhona kuya kuba nzima kunyuso ngalunye lwe-20dB. Imeko yezixhobo zasekuhlaleni ifuna kuphela ukusebenza okukhuselweyo okumalunga ne-40dB, ngelixa imeko yezixhobo zomkhosi ifuna ukusebenza ngempumelelo okungaphezulu kwe-60dB.

Izinto eziphathekayo ezinombane ophezulu kunye ne-magnetic permeability zingasetyenziswa njengezinto zokukhusela. Izinto ezisetyenziswa ngokuqhelekileyo zikhusela ipleyiti yentsimbi, ipleyiti ye-aluminium, i-aluminium foil, ipleyiti yobhedu, i-foil yobhedu njalo njalo. Ngeemfuno ezingqongqo zokuhambelana kombane we-electromagnetic kwiimveliso zasekuhlaleni, ngakumbi nangakumbi abavelisi baye bamkela indlela yokufaka i-nickel okanye ubhedu kwimeko yeplastiki ukuze bakhuseleke.

uyilo PCB, nceda uqhagamshelane 020-89811835

Isithathu, ukuhluza
Ukucoca bubuchule bokwenza ingxolo ye-electromagnetic kwisizinda samaza, ukubonelela ngendlela ephantsi yokuthintela ingxolo ye-electromagnetic ukufezekisa injongo yokucinezela ukuphazamiseka kwe-electromagnetic. Sika umendo osasazwa uphazamiseko ecaleni komgca wesignali okanye umgca wamandla, kwaye ukukhuselwa ndawonye kukukhusela ukuphazanyiswa okugqibeleleyo. Umzekelo, isihluzi sobonelelo lwamandla sibonisa ukuchaneka okuphezulu kumbane ophindaphindwayo we-50 Hz, kodwa sibonisa ukunyanzeliswa okuphantsi kwengxolo ye-electromagnetic spectrum.

Ngokwezinto ezahlukeneyo zokucoca, isihluzi sahlulwe saba sisihluzo samandla e-AC, isihluzo somgca wokuhambisa umqondiso kunye nesihluzo sokuqhawula. Ngokwebhanti yefrikhwensi yesihluzi, isihluzi sinokwahlulwa sibe ziindidi ezine zezihluzi: ukudlula okuphantsi, ukupasa okuphezulu, ukudlula ibhendi, kunye nokumisa ibhendi.

Uluqhuba njani uyilo lwe-EMC kwibhodi yePCB?

Isine, unikezelo lwamandla, iteknoloji yokumisa
Nokuba sisixhobo sobuchwepheshe bolwazi, izixhobo zombane zikanomathotholo, kunye neemveliso zombane, kufuneka zinikwe amandla ngumthombo wamandla. Unikezelo lwamandla lwahlulahlulwe kunikezelo lwamandla lwangaphandle kunye nonikezelo lwangaphakathi lwangaphakathi. Ubonelelo lwamandla ngumthombo oqhelekileyo kunye nonzulu wokuphazamiseka kwe-electromagnetic. Njengempembelelo yegridi yamandla, i-voltage ye-peak ingaba phezulu njenge-kilovolts okanye ngaphezulu, eya kubangela umonakalo onobungozi kwisixhobo okanye inkqubo. Ukongeza, intambo yamandla engundoqo yindlela yeempawu ezahlukeneyo zokuphazamiseka ukuze zihlasele izixhobo. Ke ngoko, inkqubo yonikezelo lwamandla, ngakumbi uyilo lwe-EMC yonikezelo lombane lokutshintsha, luyinxalenye ebalulekileyo yoyilo lwenqanaba lecandelo. Amanyathelo ahlukeneyo, afana nekhebula lonikezelo lwamandla lutsalwa ngokuthe ngqo kwisango eliphambili legridi yamandla, i-AC ethathwe kwigridi yamandla izinzile, i-low-pass filtering, ukuhlukaniswa phakathi kwe-wind transformer windings, ukukhusela, ukunyanzeliswa kwe-surge, kunye ne-overvoltage kunye nokhuseleko oludlulayo.

I-Grounding ibandakanya ukubeka phantsi, ukubeka umqondiso, njalo njalo. Uyilo lomzimba womhlaba, uyilo locingo olusezantsi, kunye nokuphazamiseka kocingo olusezantsi kwiifrikhwensi ezahlukeneyo azinxulumananga kuphela nokhuseleko lombane lwemveliso okanye inkqubo, kodwa zikwanxulumene nokuhambelana kwe-electromagnetic kunye netekhnoloji yokulinganisa.

Ukubekwa komhlaba okuhle kunokukhusela ukusebenza okuqhelekileyo kwesixhobo okanye inkqubo kunye nokhuseleko lomntu, kwaye kunokuphelisa ukuphazamiseka okuhlukeneyo kombane kunye nokubetha kombane. Ke ngoko, ukuyila komhlaba kubaluleke kakhulu, kodwa ikwangumxholo onzima. Kukho iintlobo ezininzi zeengcingo eziphantsi komhlaba, kubandakanywa umhlaba onengqondo, umhlaba womqondiso, umhlaba wekhaka, kunye nomhlaba wokukhusela. Iindlela zokumisa zinokwahlulwa zibe yindawo enye, isiseko esinamanqaku amaninzi, umhlaba oxubeneyo kunye nomhlaba odadayo. Umphezulu ofanelekileyo wokumisa kufuneka ube kwi-zero, kwaye akukho mahluko unokubakho phakathi kweendawo zokumisa. Kodwa ngokwenene, nayiphi na “umhlaba” okanye ucingo lomhlaba lunokuchasana. Xa ukuhamba kwangoku, ukuhla kwe-voltage kuya kwenzeka, ukwenzela ukuba amandla ombane omhlaba angabikho zero, kwaye kuya kuba ne-voltage yomhlaba phakathi kweendawo ezimbini zokumisa. Xa isiphaluka sisekelwe kwiindawo ezininzi kwaye kukho uxhulumaniso lwesignali, luya kwenza i-voltage yokuphazamiseka kwe-loop yomhlaba. Ngoko ke, iteknoloji yokumisa igxininisekile kakhulu, njengokumisa umqondiso kunye nokubekwa kwamandla kufuneka kuhlulwe, iisekethe eziyinkimbinkimbi zisebenzisa i-multi-point grounding kunye nesiseko esiqhelekileyo.