Sei mabhodhi ePCB achiita impedance?
Impedance - kutaura zvazviri, rinoreva kuramba uye parameters vaviri reactance, nokuti PCB mutsetse kufunga plug-in kugadzwa emagetsi zvinoriumba, plug-in pashure kufunga conductivity uye chiratidzo kutapurirana kuita uye dzimwe nyaya, saka. hazvidziviriki kuti iyo yakaderera iyo impedance iri nani, iyo resistivity inofanira kunge yakaderera pane per square centimita 1 × 10 ye minus 6 nguva inotevera.
Kune rimwe divi, PCB bhodhi mukugadzira nzira kuenda kuburikidza nemhangura inonyura, tin plating (kana kemikari plating, kana thermal pfapfaidzo tin), zvibatanidza uye zvimwe zvikamu zvechibatanidzo uye zvinhu zvinoshandiswa mune iyi link zvinofanirwa kuve nechokwadi chekuti pasi. yeResistivity, kuitira kuti ive nechokwadi chekuti iyo impedance yePCB board yakadzikira kuitira kuti ienderane nezvinodiwa zvemhando yechigadzirwa, kana zvikasadaro bhodhi redunhu harishande zvakajairika.
Iyo indasitiri yemagetsi yakazara, PCB redunhu bhodhi fekitori mune tin-plating link ndiyo inonyanya kunetsa, iko kukanganisa kweiyo impedance yeakakosha links, nekuti redunhu bhodhi tin-plating link, yave kufarirwa kuzadzisa chinangwa. tin-plating tichishandisa kemikari tin-plating tekinoroji, asi isu seindasitiri yezvemagetsi seanogamuchira indasitiri yemagetsi, kana PCB bhodhi yekugadzira nekugadzira indasitiri kweanopfuura makore gumi ekusangana nekuona.
Kune indasitiri yezvemagetsi, zvinoenderana nemutsara wekuferefeta, kushaya simba kwakanyanya kwekemikari tin layer iri nyore kuburitsa (zvese zviri nyore oxidation kana deliquescence), kushambidzika kwakashata kunotungamira kunetsa kupinza, impedance yakakwira zvakanyanya zvichitungamira mukutadza conductivity kana. iyo yose bhodhi kuita kusagadzikana, nyore kukura tin ndebvu kutungamirira PCB mutsetse pfupi-circuiting kana kunyange kupiswa kana pamoto zviitiko.
Mutsara mukuru wePCB wedunhu bhodhi ndeyemhangura foil, foil yemhangura mumajoini ekutengesa ndiyo tin layer, uye zvigadzirwa zvemagetsi zviri kuburikidza nesolder paste (kana solder mutsara) wakasungirirwa pamusoro pe tin layer, chokwadi, solder paste mu kunyunguduka kwekutengesa kune zvigadzirwa zvemagetsi uye tin plating layer pakati perata simbi (kureva, conductive simbi monomers), saka zvinogona kuve nyore uye zvakapfupika kuratidza kuti zvinhu zvemagetsi zvakaputirwa nerata yekuisa pasi nepasi pePCB. bhodhi uye ipapo mhangura foil Connection.
Saka kuchena kweti plating layer uye impedance yayo ndiyo kiyi;asi kwete pamberi pekubatana kwezvinhu zvemagetsi, zvakananga nechishandiso chekuona iyo impedance, kutaura zvazviri, chiridzwa probe (kana inozivikanwa semita peni) inopera zvakare kuburikidza nekutanga kusangana nebhodhi redunhu pazasi pevhu. yefoiri yemhangura yerata yekuisa layer uyezve nepasi pePCB board copper foil kubatanidza ikozvino.Saka iyo tin coating ndiyo kiyi, ndiyo kiyi yekukanganisa iyo impedance uye kukanganisa mashandiro edunhu bhodhi bhodhi, asi zvakare nyore kufuratirwa kiyi.
Kuwedzera kune simbi monomers, makomisheni avo ari murombo conductor emagetsi kana kunyange asiri-conductive (izvo zvinokonzereswa nekuvapo kwekugovera kugona mumutsara kana kutapurirana kwekiyi), saka tin plating layer pamberi peizvi. mhando yezvinoita senge inoitisa uye isiri-conductive makomisheni kana musanganiswa wetin, yakagadzirira-yakagadzirwa resistivity kana ramangwana oxidation, iyo electrolytic reaction yehunyoro uye inowirirana resistivity uye impedance yakakwira zvakanyanya (yakakwana kukanganisa mwero kana chiratidzo chekufambisa kwemaseketi edhijitari. )chiyero kana chiratidzo chekufambisa mumaseketi edhijitari), uye hunhu hwayo impedance haina kuenderana.Izvi zvinokanganisa kushanda kwebhodhi redunhu uye muchina wose.
Panyaya yezvino kugadzirwa kwemagariro chiitiko, pcb bhodhi pazasi pemidziyo yekuisa uye kuita ndeye kukanganisa iyo PCB bhodhi hunhu hwekuipedance kwechikonzero chakakosha uye chikonzero chakanangana, asiwo nekuda kwekuputira nekuchembera. uye unyoro electrolysis yekusiyana kweiyo impedance kuitira kuti iyo impedance ibudise kunetsekana pamusoro pekukanganisa kweiyo yakavanzika uye inoshanduka, uye chikonzero chikuru chekuvanza kwayo chiri mune zvinotevera: yekutanga haigone kuonekwa ne ziso rakashama, uye yechipiri haigone kuyera nguva dzose, nekuti ine nguva uye ambient humidity uye shanduko yeimpedance yebhodhi uye kuita kwemuchina.Nekuti ine musiyano nekuchinja kwenguva uye humidity kwezvakatipoteredza, saka zvinogara zviri nyore kufuratirwa.
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Nguva yekutumira: Sep-08-2023