Me yasa allon PCB ke yin impedance?
Impedance - a gaskiya, yana nufin juriya da ma'auni na biyu na reactance, saboda layin PCB don yin la'akari da shigar da kayan aikin lantarki, toshewa bayan la'akari da ƙaddamarwa da aikin watsa sigina da sauran batutuwa, don haka Babu makawa cewa ƙananan impedance mafi kyau, tsayayyar ya kamata ya zama ƙasa da kowane santimita murabba'in 1 × 10 na rage sau 6 masu zuwa.
A daya hannun, PCB hukumar a cikin samar da tsari don shiga ta hanyar da jan karfe nutse, da tin plating (ko sinadarai plating, ko thermal fesa tin), haši da sauran sassa na mahada da kayan amfani a cikin wannan mahada dole ne tabbatar da cewa kasa. na resistivity, domin a tabbatar da cewa gaba daya impedance na PCB hukumar ya yi low domin bi da bukatun na samfurin ingancin, ko kuma da kewaye hukumar ba za ta yi aiki kullum.
Masana'antar lantarki gabaɗaya, masana'antar keɓaɓɓiyar hukumar PCB a cikin hanyar haɗin gwiwar tin-plating ita ce mafi matsala, ita ce tasirin tasirin hanyoyin haɗin yanar gizo, saboda hanyar haɗin keɓaɓɓiyar allon katako, yanzu ta shahara don cimma manufar. tin-plating ta amfani da fasahar tin-plating na sinadarai, amma mu a matsayin masana'antar lantarki a matsayin mai karɓar masana'antar lantarki, ko masana'antar samarwa da sarrafa PCB fiye da shekaru 10 na lamba da kallo.
Ga masana'antar lantarki, bisa ga layin bincike, mafi ƙarancin rauni na Layer tin ɗin sinadarai yana da sauƙin canza launin (duka mai sauƙin iskar oxygen ko ɓacin rai), ƙarancin brazing yana haifar da wahalar walda, impedance yana da tsayi da yawa yana haifar da rashin ƙarfi ko rashin ƙarfi. da dukan jirgin yi rashin zaman lafiya, sauki girma tin whiskers kai ga PCB line short-circuiting ko ma kone ko a kan wuta aukuwa.
Babban layin da'irar PCB shine foil ɗin tagulla, foil ɗin tagulla a cikin haɗin gwiwa shine tin Layer, kuma kayan aikin lantarki suna ta hanyar solder manna (ko layin solder) wanda aka waƙa a saman Layer ɗin tin, a zahiri, manna solder a cikin narkewa yanayin soldering zuwa lantarki aka gyara da kwano plating Layer tsakanin tin karfe (watau conductive karfe monomers), don haka yana iya zama mai sauki da kuma takaitacce don nuna cewa lantarki aka gyara suna plated da tin plating Layer tare da kasa na PCB. allo sai kuma tagulla foil Connection.
Don haka tsarkin kwandon da aka yi wa kwano da abin da ya hana shi shi ne mabuɗin;amma ba kafin haɗin kayan aikin lantarki ba, kai tsaye tare da kayan aiki don gano impedance, a gaskiya ma, binciken kayan aikin (ko wanda aka sani da alƙalami na mita) yana kuma ta hanyar tuntuɓar farko tare da allon allo a kasan saman saman. na foil ɗin tagulla na Layer plating Layer sa'an nan kuma tare da kasan allon PCB na tagulla don haɗa abin da ke yanzu.Don haka rufin tin shine maɓalli, shine mabuɗin don rinjayar impedance kuma yana tasiri aikin hukumar da'irar, amma kuma yana da sauƙin yin watsi da maɓallin.
Bayan karfe monomers, mahadi na su matalauta conductors na wutar lantarki ko ma da ba ya aiki (wanda kuma shi ne ya haifar da samuwar ikon rarraba a cikin layi ko watsa iya aiki na key), don haka da tin plating Layer a gaban wannan. nau'in nau'in mahaɗar da ba daidai ba ko gaurayawan tin, shirye-shiryen sa na resistivity ko iskar shaka na gaba, da electrolytic dauki na danshi da kuma m resistivity da impedance ne quite high (isa ya shafi matakin ko siginar watsa na dijital da'irori. ).matakin ko watsa sigina a cikin da'irori na dijital), kuma halayen sa ba daidai ba ne.Wannan yana shafar aikin allon kewayawa da injin gabaɗaya.
A cikin sharuddan halin yanzu zamantakewa samar sabon abu, pcb hukumar a kan kasa na plating abu da kuma yi shi ne ya shafi PCB hukumar halaye na impedance na mafi muhimmanci dalili da kuma mafi kai tsaye dalilin, amma kuma saboda plating tare da tsufa. da danshi electrolysis na sãɓãwar launukansa na impedance ta yadda ta impedance don samar da wani damuwa game da tasirin tasirin mafi boye da canji, da kuma babban dalilin da ya boye ya ta'allaka ne a cikin wadannan: na farko ba za a iya gani da ido tsirara, kuma na biyu ba zai iya zama ma'auni akai-akai ba, saboda yana da lokaci da zafi na yanayi da canji na impedance na jirgi da aikin na'ura.Domin yana da sauye-sauye tare da canjin lokaci da yanayin yanayi, don haka yana da sauƙi a yi watsi da shi koyaushe.
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Lokacin aikawa: Satumba-08-2023