Cov ntawv luam tawm Circuit boards (PCBs) tau dhau los ua ib feem tseem ceeb ntawm cov thev naus laus zis niaj hnub no, txhawb nqa tag nrho cov khoom siv hluav taws xob uas peb tso siab rau txhua hnub.Thaum cov khoom thiab kev ua haujlwm ntawm PCB paub zoo, muaj ib lub ntsiab lus tseem ceeb uas feem ntau tsis saib xyuas tab sis tseem ceeb heev rau nws txoj haujlwm: lub substrate.Hauv cov ntawv blog no, peb yuav tshawb xyuas seb lub substrate yog dab tsi hauv PCB thiab vim li cas nws thiaj li muaj lub luag haujlwm tseem ceeb.
Dab tsi yog qhov substrate hauv PCB?
Cov substrates, feem ntau hu ua PCB substrates lossis cov khoom siv hauv pawg thawj coj, yog lub hauv paus rau mounting PCB cov khoom siv hluav taws xob.Nws yog ib txheej uas tsis yog-conductive uas muab cov qauv kev txhawb nqa thiab ua raws li cov txheej txheem hluav taws xob rwb thaiv tsev ntawm cov txheej tooj liab ntawm lub rooj sib tham.Cov khoom siv feem ntau siv hauv cov khoom siv hauv PCB yog iav fiber reinforced epoxy laminate, feem ntau hu ua FR4.
Lub ntsiab lus ntawm cov khoom siv hauv paus:
1. Kev them nyiaj yug tshuab:
Lub luag haujlwm tseem ceeb ntawm lub substrate yog muab kev txhawb nqa txhua yam rau cov khoom muag uas tau teeb tsa rau ntawm lub rooj tsavxwm.Nws ua kom muaj kev ruaj ntseg thiab kav ntev ntawm PCB, tso cai rau nws tiv taus kev ntxhov siab sab nraud, kev co thiab kub hloov.Yog tias tsis muaj cov txheej txheem muaj zog, cov txheej txheem kev ncaj ncees ntawm PCB tuaj yeem cuam tshuam, cuam tshuam kev ua haujlwm thiab kev ua haujlwm ntev ntawm cov khoom siv hluav taws xob.
2. Hluav taws xob rwb thaiv tsev:
Lub substrate ua raws li hluav taws xob insulator ntawm cov txheej txheem tooj liab ntawm PCB.Lawv tiv thaiv hluav taws xob luv luv thiab cuam tshuam ntawm cov khoom sib txawv thiab cov kab sib txawv, uas tuaj yeem ua rau lub cev tsis zoo lossis kev puas tsuaj.Tsis tas li ntawd, cov khoom dielectric ntawm lub substrate pab tswj kev ncaj ncees thiab zoo ntawm cov teeb liab hluav taws xob ntws hauv lub rooj tsavxwm.
3. Thaum tshav kub kub dissipation:
Cov khoom siv hluav taws xob inevitably ua kom sov thaum ua haujlwm.Substrates ua lub luag haujlwm tseem ceeb hauv kev ua kom cov cua sov kom deb ntawm cov khoom kom lawv nyob hauv qhov kev ua haujlwm zoo.Qee cov ntaub ntawv substrate, xws li cov tub ntxhais hlau PCBs lossis ceramics, tau txhim kho cov thermal conductivity, tso cai rau cov cua sov hloov mus thiab txo qhov kev pheej hmoo ntawm overheating.
4. Teeb liab kev ncaj ncees:
Cov khoom siv ntawm lub substrate ho cuam tshuam lub teeb liab kev ncaj ncees ntawm PCB.Piv txwv li, impedance tswj xyuas kom zoo ib yam ntawm cov high-frequency signals yam tsis muaj attenuation.Lub dielectric tas li thiab poob tangent ntawm cov khoom siv substrate cuam tshuam rau cov yam ntxwv impedance thiab kev sib kis kab kev ua tau zoo, thaum kawg txiav txim siab tag nrho kev ua haujlwm thiab kev ntseeg siab ntawm PCB.
Txawm hais tias lub substrate yuav tsis yog qhov pom tshaj plaws, nws ua lub luag haujlwm tseem ceeb hauv kev ua tau zoo, ua haujlwm ntev thiab kev ntseeg siab ntawm cov ntawv luam tawm Circuit Board.Qhov tseem ceeb ntawm substrate tsis tuaj yeem hais txog qhov tseem ceeb, los ntawm kev muab kev txhawb nqa tshuab thiab kev sib cais hluav taws xob los ua kom yooj yim rau cov cua sov dissipation thiab tswj cov teeb liab kev ncaj ncees.Nkag siab txog qhov tseem ceeb ntawm kev xaiv cov khoom siv substrate kom raug thiab nws cov khoom yog qhov tseem ceeb rau PCB tus tsim, cov tuam ntxhab thiab cov neeg nyiam siv hluav taws xob.Los ntawm kev nkag siab txog lub luag haujlwm ntawm substrates, peb tuaj yeem ua kom muaj kev vam meej thiab kev ua haujlwm ntawm cov khoom siv hluav taws xob ntau dua thiab ua tau zoo yav tom ntej.
Post lub sij hawm: Lub Xya hli ntuj-26-2023