Copper txheej yog dab tsi?
Lub thiaj li hu ua tooj liab ncuav yog siv qhov chaw tsis siv ntawm lub
PCB raws li ib tug siv nto thiab ces sau nws nrog cov khoom tooj liab.Cov chaw tooj liab no tseem hu ua tooj liab filling.
Qhov tseem ceeb ntawm cov txheej tooj liab yog txhawm rau txo qhov impedance ntawm cov xaim hauv av thiab txhim kho lub peev xwm tiv thaiv kev cuam tshuam;txo qhov hluav taws xob poob thiab txhim kho kev ua haujlwm ntawm lub zog hluav taws xob;yog tias nws txuas nrog hauv av xaim, nws kuj tuaj yeem txo qhov voj voog.
Tsis tas li ntawd rau lub hom phiaj ntawm kev ua kom lub PCB tsis deformed li sai tau thaum lub sij hawm soldering, feem ntau PCB manufacturers kuj yuav tsum tau PCB designers sau lub qhib cheeb tsam ntawm lub PCB nrog tooj liab los yog daim phiaj-zoo li hauv av xov hlau.Yog tias cov tooj liab tsis ua haujlwm zoo, nws yuav Yog tias qhov nce tsis tsim nyog rau qhov poob, puas yog cov txheej tooj liab "ntau qhov zoo dua qhov tsis zoo" lossis "qhov tsis zoo tshaj qhov zoo"?
Txhua leej txhua tus paub hais tias nyob rau hauv cov ntaub ntawv ntawm high zaus, kev faib capacitance ntawm cov xov hlau nyob rau hauv lub luam Circuit Court board yuav ua hauj lwm.Thaum qhov ntev ntau dua 1/20 ntawm qhov sib thooj ntawm lub suab nrov zaus, cov nyhuv kav hlau txais xov yuav tshwm sim, thiab lub suab nrov yuav tawm los ntawm cov xov hlau.Yog tias muaj qhov tsis zoo ntawm cov tooj liab hauv PCB, cov tooj liab nchuav ua ib qho cuab yeej rau kev nthuav tawm suab nrov.
Yog li ntawd, nyob rau hauv ib tug high-frequency Circuit Court, tsis txhob xav hais tias cov av xaim txuas nrog rau hauv av nyob rau hauv ib qho chaw.Lub dav hlau hauv av ntawm laminate yog "zoo av".Yog tias cov txheej txheem tooj liab raug tswj kom zoo, cov txheej tooj liab tsis yog tsuas yog ua rau qhov tam sim no, tab sis kuj tseem ua lub luag haujlwm ntawm kev tiv thaiv kev cuam tshuam.
Ob hom ntawm tooj liab txheej
Feem ntau muaj ob txoj hauv kev ntawm tooj liab ncuav, uas yog thaj chaw loj tooj liab ncuav thiab daim phiaj tooj liab.Nws feem ntau nug seb qhov loj-qhov tooj liab ncuav zoo dua los yog daim phiaj tooj liab ncuav zoo dua.Nws tsis zoo rau generalize.
Vim li cas?Loj-chaw tooj liab txheej muaj ob lub zog ntawm kev nce tam sim no thiab tiv thaiv.Txawm li cas los xij, yog tias thaj tsam loj ntawm tooj liab txheej siv rau yoj soldering, lub rooj tsavxwm tuaj yeem nqa thiab txawm tias hlwv.Yog li ntawd, rau thaj tsam loj ntawm tooj liab txheej, ob peb grooves feem ntau yog qhib los daws cov hlwv ntawm cov ntawv ci tooj liab.Raws li qhia hauv qab no:
Daim phiaj tooj liab-clad feem ntau yog siv rau kev tiv thaiv, thiab cov nyhuv ntawm kev nce tam sim no raug txo.Los ntawm qhov kev xav ntawm cov cua kub dissipation, daim phiaj yog qhov zoo (nws txo cov cua sov ntawm tooj liab) thiab ua lub luag haujlwm ntawm electromagnetic shielding rau qee yam.Tshwj xeeb tshaj yog rau circuits xws li kov, raws li qhia hauv daim duab hauv qab no:
Nws yuav tsum tau muab sau tseg tias daim phiaj yog ua los ntawm cov kab nyob rau hauv staggered cov lus qhia.Peb paub tias rau lub voj voog, qhov dav ntawm cov kab muaj qhov sib thooj "hluav taws xob ntev" rau kev khiav hauj lwm zaus ntawm lub rooj tsav xwm hauv Circuit Court (qhov loj tiag tiag yog muab faib los ntawm cov zaus digital sib raug rau qhov ua haujlwm zaus, saib cov phau ntawv muaj feem xyuam rau cov ntsiab lus. ).
Thaum lub sijhawm ua haujlwm tsis yog siab heev, tej zaum lub luag haujlwm ntawm kab sib chaws tsis pom tseeb.Thaum qhov hluav taws xob ntev sib npaug ntawm kev ua haujlwm zaus, nws yog qhov phem heev.Koj yuav pom tias PCB tsis ua haujlwm tag nrho, thiab cov kev cuam tshuam tau ua haujlwm txhua qhov chaw.teeb liab ntawm.
Cov lus qhia yog xaiv raws li kev ua haujlwm ntawm lub rooj tsavxwm tsim, tsis txhob tuav ib qho.Yog li ntawd, lub high-frequency Circuit Court muaj ib tug siab yuav tsum tau rau ntau lub hom phiaj rau kev tiv thaiv kev cuam tshuam, thiab lub low-frequency Circuit Court muaj ib tug loj tam sim no Circuit Court thiab lwm yam uas feem ntau siv tag tooj liab.
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