Kutheni iibhodi zePCB zenza i-impedance?
I-Impedance - enyanisweni, ibhekisela ekuchaseni kunye neeparitha zesibini sokusabela, kuba umgca we-PCB ukuqwalasela ukufakwa kweplagi yamacandelo e-elektroniki, i-plug-in emva kokuqwalaselwa kwe-conductivity kunye nokusebenza kokudluliselwa komqondiso kunye neminye imiba, ngoko akunakuphepheka ukuba i-impedance ephantsi ingcono, ukuxhathisa kufuneka kube ngaphantsi kwe-square centimeter 1 × 10 ye-minus 6 amaxesha alandelayo.
Kwelinye icala, ibhodi PCB kwinkqubo imveliso ukuya ukutyhutyha ubhedu, inkonkxa yokutyabeka (okanye yokubeka imichiza, okanye itoti yokutshiza thermal), izihlanganisi kunye nezinye iinxalenye ikhonkco kunye nezinto ezisetyenziswa kweli khonkco kufuneka aqinisekise ukuba ezantsi. of the resistivity, ukuze kuqinisekiswe ukuba i-impedance yonke yebhodi ye-PCB iphantsi ukuze ihambelane neemfuno zomgangatho wemveliso, okanye ibhodi yesekethe ayiyi kusebenza ngokuqhelekileyo.
Ishishini le-elektroniki lilonke, ibhodi yesekethe PCB kwibhodi yesekethe kwikhonkco letin-plating yeyona ngxaki, yimpembelelo i impedance amakhonkco engundoqo, kuba ibhodi yesekethe tin-plating link, ngoku ithandwa ukuphumeza injongo. i-tin-plating isebenzisa iteknoloji ye-tin-plating, kodwa thina njengeshishini le-elektroniki njengomamkeli kushishino lombane, okanye i-PCB yemveliso yebhodi kunye noshishino lokucubungula iminyaka engaphezu kwe-10 yoqhagamshelwano kunye nokuqwalaselwa.
Kwishishini le-elektroniki, ngokutsho kumgca wophando, obona buthathaka bubulalayo bomgangatho wetoti yekhemikhali kulula ukuyitshintsha (zombini i-oxidation elula okanye i-deliquescence), ukunyanyiswa okungahambi kakuhle kukhokelela ekubeni kube nzima ukuwelda, ukungenelela kuphezulu kakhulu kukhokelela ekuqhubeni kakubi okanye yonke ibhodi ukusebenza ukungazinzi, lula ukukhula amabhovu inkonkxa kukhokelela PCB line short-circuiting okanye nokuba utshise okanye kwiziganeko umlilo.
Umgca ophambili webhodi yesekethe ye-PCB yifoyile yobhedu, ifoyile yobhedu kumalungu e-solder ngumaleko we-tin, kwaye amacandelo e-elektroniki adlula kwintlama ye-solder (okanye umgca we-solder) odityaniswe ngaphezulu komgangatho we-tin, enyanisweni, intlama ye-solder ukunyibilika isimo sokuthengisa kumacandelo elektroniki kunye nenkcenkceza umaleko phakathi kwenkcenkce yenkcenkce (oko kukuthi, iimonomers zetsimbi eziqhubayo), ukuze kube lula kwaye kube mfutshane ukubonisa ukuba amacandelo e-elektroniki afakwe ngenkcenkceshe yenkcenkce kunye nezantsi kwe-PCB. ibhodi kunye nefoyile yobhedu Connection.
Ngoko ukucoceka komgangatho we-tin kunye ne-impedance yayo ngundoqo;kodwa hayi phambi kodibaniso lwamacandelo e-elektroniki, ngokuthe ngqo kunye nesixhobo sokubona i-impedance, enyanisweni, isixhobo sokuhlola isixhobo (okanye eyaziwa ngokuba yipeni yemitha) siphela kwakhona ngonxibelelwano lokuqala kunye nebhodi yebhodi yesekethe emazantsi omhlaba. yefoyile yobhedu yocweyo lwenkcenkce kwaye emva koko kunye nomzantsi webhodi ye-PCB yefoyile yobhedu ukudibanisa okwangoku.Ngoko ke inkonkxa ukutyabeka isitshixo, isitshixo ukuchaphazela impedance kwaye kuchaphazela ukusebenza kwebhodi yebhodi yesekethe, kodwa kulula ukuba ngoyaba isitshixo.
Ukongeza monomers metal, iikhompawundi zabo abaqhubi kakubi zombane okanye nokuba non-conductive (nto leyo ikwabangelwa ubukho umthamo ukusasaza kumgca okanye umthamo transmission of isitshixo), ngoko umaleko tin Plating phambi kolu luhlu. uhlobo lwekhompawundi ezibonakala ngathi ziqhuba kwaye zingaqhubekiyo okanye imixube yetoti, ukumelana kwayo esele yenziwe okanye i-oxidation yexesha elizayo, ukusabela kwe-electrolytic ukufuma kunye nokumelana kwayo okuhambelanayo kunye nokuphazamiseka kuphezulu kakhulu (ngokwaneleyo ukuchaphazela inqanaba okanye ukuhanjiswa komqondiso kwiisekethe zedijithali. ).inqanaba okanye ukuhanjiswa komqondiso kwiisekethe zedijithali), kwaye i-impedance yayo yeempawu ayihambelani.Oku kuchaphazela ukusebenza kwebhodi yesekethe kunye nomatshini ngokupheleleyo.
Ngokubhekiselele kwinto yangoku yemveliso yentlalo, ibhodi ye-pcb ezantsi kwezinto zokucoca kunye nokusebenza kukuchaphazela iimpawu zebhodi ye-PCB ye-impedance yesona sizathu sibalulekileyo kunye nesona sizathu sithe ngqo, kodwa nangenxa yokwaleka kunye nokwaluphala. kunye nokufuma kwe-electrolysis yokuguquguquka kwe-impedance ukuze i-impedance yayo ivelise ixhala malunga nefuthe lempembelelo efihliweyo ngakumbi kwaye iyatshintsha, kwaye esona sizathu siphambili sokufihla kwayo ilele koku kulandelayo: eyokuqala ayinakubonwa yi iliso leze, kwaye eyesibini ayinakulinganiswa rhoqo, kuba inexesha kunye nokufuma kwe-ambient kunye nokutshintsha kwe-impedance yebhodi kunye nokusebenza komatshini.Ngenxa yokuba inokuhlukahluka kunye nokutshintsha kwexesha kunye nokufuma kokusingqongileyo, ngoko kusoloko kulula ukungahoywa.
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Ixesha lokuposa: Sep-08-2023