Njira yoteteza bwino
Pachitukuko cha mankhwala, kuchokera pakuwona mtengo, kupita patsogolo, khalidwe ndi ntchito, nthawi zambiri zimakhala bwino kuganizira mozama ndikugwiritsa ntchito ndondomeko yoyenera pakukonzekera polojekiti mwamsanga. Mayankho ogwira ntchito nthawi zambiri sakhala abwino potengera magawo owonjezera ndi mapulogalamu ena "ofulumira" okonzedwa omwe akhazikitsidwa pambuyo pa ntchitoyo. Ubwino wake ndi kudalirika kwake ndizosauka, ndipo mtengo wokhazikitsidwa kale pakuchitapo kanthu ndi wapamwamba. Kusawoneratu m'gawo loyambirira la polojekiti nthawi zambiri kumabweretsa kuchedwa kubweretsa ndipo kungayambitse makasitomala kusakhutira ndi malonda. Vutoli limagwira ntchito pamapangidwe aliwonse, kaya ndi kayesedwe, manambala, magetsi kapena makina.
Poyerekeza ndi zigawo zina zotsekereza IC imodzi ndi PCB, mtengo wotsekereza PCB yonse ndi pafupifupi nthawi za 10, ndipo mtengo wotsekereza mankhwala onse ndi nthawi 100. Ngati mufunika kutsekereza chipinda chonse kapena nyumba, mtengo wake ndi wa zakuthambo.
Pachitukuko cha mankhwala, kuchokera pakuwona mtengo, kupita patsogolo, khalidwe ndi ntchito, nthawi zambiri zimakhala bwino kuganizira mozama ndikugwiritsa ntchito ndondomeko yoyenera pakukonzekera polojekiti mwamsanga. Mayankho ogwira ntchito nthawi zambiri sakhala abwino potengera magawo owonjezera ndi mapulogalamu ena "ofulumira" okonzedwa omwe akhazikitsidwa pambuyo pa ntchitoyo. Ubwino wake ndi kudalirika kwake ndizosauka, ndipo mtengo wokhazikitsidwa kale pakuchitapo kanthu ndi wapamwamba. Kusawoneratu m'gawo loyambirira la polojekiti nthawi zambiri kumabweretsa kuchedwa kubweretsa ndipo kungayambitse makasitomala kusakhutira ndi malonda. Vutoli limagwira ntchito pamapangidwe aliwonse, kaya ndi kayesedwe, manambala, magetsi kapena makina.
Poyerekeza ndi zigawo zina zotsekereza IC imodzi ndi PCB, mtengo wotsekereza PCB yonse ndi pafupifupi nthawi za 10, ndipo mtengo wotsekereza mankhwala onse ndi nthawi 100. Ngati mufunika kutsekereza chipinda chonse kapena nyumba, mtengo wake ndi wa zakuthambo.
Cholinga cha EMI chotetezedwa ndikupanga khola la Faraday mozungulira zigawo zotsekedwa za RF za bokosi lachitsulo. Mbali zisanu zam'mwamba zimapangidwa ndi chivundikiro chotchinga kapena thanki yachitsulo, ndipo mbali ya pansi imayendetsedwa ndi zigawo zapansi mu PCB. Mu chipolopolo choyenera, palibe kutulutsa komwe kudzalowa kapena kusiya bokosilo. Kutulutsa kowopsa kotetezedwa kumeneku kudzachitika, monga kutulutsidwa kuchokera kumabowo kupita kumabowo a malata, ndipo zitini za malata zimalola kutentha kutentha pakubwereranso. Kutayikiraku kumatha kuyambitsidwanso ndi zolakwika za khushoni ya EMI kapena zida zowotcherera. Phokosoli limathanso kumasulidwa kuchokera kumtunda pakati pa kuyika pansi mpaka pansi.
Pachikhalidwe, chitetezo cha PCB chimalumikizidwa ndi PCB ndi mchira wowotcherera wa pore. The kuwotcherera mchira pamanja welded pamanja pambuyo chachikulu chokongoletsera ndondomeko. Iyi ndi njira yowononga nthawi komanso yokwera mtengo. Ngati kukonza kumafunika panthawi yokonza ndi kukonza, kuyenera kuwotcherera kuti alowe mu dera ndi zigawo pansi pa chishango chotchinga. M'dera la PCB lomwe lili ndi gawo lovuta kwambiri, pali ngozi yodula kwambiri.
Zomwe zimapangidwira tanki yotchinga yamadzimadzi ya PCB ndi motere:
Zopondapo zazing'ono;
Kusintha kwachinsinsi chochepa;
Mapangidwe awiri (mpanda ndi chivindikiro);
phala kapena phala pamwamba;
Multi-cavity pattern (kupatula zigawo zingapo zokhala ndi chishango chomwecho);
Pafupifupi zopanda malire kapangidwe kusinthasintha;
Zolowera;
Chivundikiro chokhazikika chazigawo zokonzekera mwachangu;
Ine / O hole
Cholumikizira cholumikizira;
RF absorber imawonjezera chitetezo;
chitetezo cha ESD chokhala ndi mapadi otsekemera;
Gwiritsani ntchito kutseka kolimba pakati pa chimango ndi chivindikiro kuti muteteze modalirika kugunda ndi kugwedezeka.
Zomwe zimatetezedwa
Zida zosiyanasiyana zotetezera zimatha kugwiritsidwa ntchito, kuphatikizapo mkuwa, siliva wa nickel ndi chitsulo chosapanga dzimbiri. Mtundu wodziwika kwambiri ndi:
Zopondapo zazing'ono;
Kusintha kwachinsinsi chochepa;
Mapangidwe awiri (mpanda ndi chivindikiro);
phala kapena phala pamwamba;
Multi-cavity pattern (kupatula zigawo zingapo zokhala ndi chishango chomwecho);
Pafupifupi zopanda malire kapangidwe kusinthasintha;
Zolowera;
Chivundikiro chokhazikika chazigawo zokonzekera mwachangu;
Ine / O hole
Cholumikizira cholumikizira;
RF absorber imawonjezera chitetezo;
chitetezo cha ESD chokhala ndi mapadi otsekemera;
Gwiritsani ntchito kutseka kolimba pakati pa chimango ndi chivindikiro kuti muteteze modalirika kugunda ndi kugwedezeka.
Nthawi zambiri, chitsulo chopangidwa ndi malata ndiye chisankho chabwino kwambiri chotsekereza zosakwana 100 MHz, pomwe mkuwa wopangidwa ndi malata ndiye wabwino koposa 200 MHz. Kupaka malata kumatha kukwaniritsa bwino kwambiri kuwotcherera. Chifukwa aluminiyamu palokha alibe makhalidwe a dissipation kutentha, si kophweka kuwotcherera pansi wosanjikiza, choncho kawirikawiri si ntchito PCB mlingo chitetezo.
Malinga ndi malamulo a chinthu chomaliza, zida zonse zomwe zimagwiritsidwa ntchito poteteza zingafunikire kukwaniritsa mulingo wa ROHS. Kuonjezera apo, ngati mankhwalawa akugwiritsidwa ntchito kumalo otentha komanso amvula, angayambitse dzimbiri zamagetsi ndi okosijeni.
Nthawi yotumiza: Apr-17-2023
