Hauv cov txheej txheem tsim ntawm PCB boards, txheej txheej ntawm PCB schematics yog ib qho tseem ceeb heev. PCB schematic layering yog hais txog kev faib tag nrho lub voj voog mus rau ntau thaj tsam kev xav, nrog rau txhua cheeb tsam sawv cev hauv ib qho ntawm cov txheej txheem. Kev tsim ntawm txhua txheej muaj cov haujlwm ywj pheej thiab lub luag haujlwm, ua rau tag nrho PCB pawg thawj coj saib muaj cov qauv hierarchical, uas yooj yim los tswj thiab hloov kho. PCB boards tuaj yeem muab faib ua ib txheej boards, ob-sided boards, thiab ntau txheej boards raws li lawv cov khaubncaws sab nraud povtseg.
1, Ib txheej board
Ib txheej txheej txheej yog lub rooj tsavxwm PCB yooj yim tshaj plaws thiab tseem yog lub rooj tsavxwm uas yooj yim thiab tus nqi qis tshaj los tsim. Nws tsuas muaj ib txheej ntawm cov ntawv ci tooj liab thiab lub voj voog tsuas tuaj yeem ntsia tau rau ntawm ib qho chaw, yog li nws muaj kev txwv tseem ceeb. Txawm li cas los xij, rau cov khoom siv hluav taws xob yooj yim thiab cov khoom siv qis, ib txheej boards tseem yog qhov kev xaiv tsim nyog.
2, Ob chav sided board
Ob chav vaj huam sib luag muaj qhov zoo sib xws rau ib txheej vaj huam sib luag, tab sis nws yog coated nrog tooj liab ntawv ntawm ob sab thiab txawv los ntawm cov pob tshab rwb thaiv tsev txheej. Vim tias muaj ob txheej ntawm cov ntawv ci tooj liab, muaj kev ywj pheej ntau dua tuaj yeem tau txais hauv kev xaim thiab kev teeb tsa ntawm lub voj voog. Ob chav sided boards feem ntau yog siv rau kev tsim hluav taws xob nrog kev sib txawv me ntsis, vim tias lawv muaj cov khoom siv ntau dua li cov boards ib txheej, thaum tseem ua tau zoo. Cov txheej txheem txheej txheem no tuaj yeem siv los ntim cov chips, cov phiaj xwm sib xyaw ua ke (ICs), thiab lwm yam khoom siv nrog cov khoom siv sib txuas.
Multilayer boards feem ntau muaj plaub mus rau rau txheej ntawm tooj liab ntawv, nrog rau ntau lwm cov khaubncaws sab nraud povtseg nyob rau hauv, nrog rau lub hwj chim txheej, av txheej, teeb liab txheej, thiab lwm yam. Multilayer boards tsis tau tsuas yog ua tau zoo heev ib feem ntom, tab sis kuj muaj ntau saj zawg zog thaiv txoj kev. Nyob rau hauv ntau txheej boards, txawm hais tias lub circuits yog complex, txoj kev tau qhia meej meej txheej txheej, yog li muaj kev ntseeg siab thiab ruaj khov. Cov txheej txheem yuav tsum tau ua rau ntau txheej boards yog siab, ua rau lawv haum rau cov khoom siv thiab cov nqi siab.
Nws yuav tsum raug sau tseg tias muaj ntau txheej txheej tsis tas txhais tau tias zoo dua, vim tias cov txheej txheem ntau ntxiv tuaj yeem ua rau cov nqi ntau ntxiv thiab cov voj voog ntau lawm. Nyob rau hauv cov txheej txheem tsim ntawm PCB boards, nws yog ib qhov tsim nyog los xaiv cov txheej txheem raws li qhov tseeb.