..1: Kos daim duab schematic.
..2: Tsim cov tsev qiv ntawv.
..3: Tsim kom muaj kev sib raug zoo network kev sib raug zoo ntawm daim duab schematic thiab cov khoom ntawm cov ntawv luam tawm.
..4: Routing thiab tso.
..5: Tsim cov ntawv luam tawm cov ntaub ntawv siv cov ntaub ntawv thiab tso cov ntaub ntawv siv ntau lawm.
.. Tom qab txiav txim siab txoj hauj lwm thiab cov duab ntawm cov khoom ntawm PCB, xav txog cov txheej txheem ntawm PCB.
1. Nrog rau txoj haujlwm ntawm cov khoom siv, cov xaim yog nqa tawm raws li txoj haujlwm ntawm cov khoom siv.Nws yog lub hauv paus ntsiab lus uas cov xaim ntawm cov ntawv luam tawm yog luv li sai tau.Cov kab mob luv luv, thiab cov channel thiab thaj chaw nyob yog me me, yog li qhov kev hla dhau yuav siab dua.Cov xov hlau ntawm lub davhlau ya nyob twg thiab cov khoom siv tawm ntawm lub rooj tsavxwm PCB yuav tsum sim kom tsis txhob nyob ib sab ntawm ib qho kev sib txuas, thiab nws yog qhov zoo dua los tso cov xaim hauv av ntawm ob lub xov hlau.Txhawm rau kom tsis txhob muaj kev sib txuas lus Circuit Court.Yog tias cov ntawv luam tawm yog cov txheej txheem ntau txheej, cov kev taw qhia ntawm cov teeb liab kab ntawm txhua txheej yog txawv ntawm cov txheej txheem uas nyob ib sab.Rau qee qhov tseem ceeb ntawm cov kab teeb liab, koj yuav tsum ua kom pom zoo nrog tus tsim kab, tshwj xeeb tshaj yog cov kab teeb liab sib txawv, lawv yuav tsum tau dhau los ua khub, sim ua kom lawv sib luag thiab kaw, thiab qhov ntev tsis txawv ntau.Tag nrho cov khoom ntawm PCB yuav tsum txo qis thiab txo cov kev coj ua thiab kev sib txuas ntawm cov khoom.Qhov dav tsawg kawg nkaus ntawm cov xov hlau hauv PCB feem ntau yog txiav txim siab los ntawm lub zog adhesion ntawm cov xov hlau thiab cov txheej txheej insulating substrate thiab cov nqi tam sim no ntws los ntawm lawv.Thaum lub thickness ntawm cov ntawv ci tooj liab yog 0.05 hli thiab qhov dav yog 1-1.5 hli, qhov kub yuav tsis siab tshaj 3 degrees thaum qhov tam sim no ntawm 2A dhau.Thaum cov hlau dav yog 1.5 hli, nws tuaj yeem ua tau raws li qhov yuav tsum tau ua.Rau kev sib xyaw ua ke, tshwj xeeb tshaj yog digital circuits, 0.02-0.03mm feem ntau yog xaiv.Tau kawg, ntev npaum li nws tau tso cai, peb siv cov xaim dav dav kom ntau li ntau tau, tshwj xeeb tshaj yog cov xaim hluav taws xob thiab cov xaim hauv av ntawm PCB.Qhov kev ncua deb tsawg kawg nkaus ntawm cov xov hlau tsuas yog txiav txim siab los ntawm kev tiv thaiv kev tiv thaiv thiab kev tawg ntawm cov xov hlau hauv qhov phem tshaj plaws.
Rau qee qhov sib xyaw ua ke (IC), lub suab tuaj yeem ua kom me dua 5-8 hli los ntawm kev xav ntawm thev naus laus zis.Kev khoov ntawm cov ntawv luam tawm feem ntau yog qhov tsawg tshaj plaws arc, thiab kev siv qis dua 90-degree khoov yuav tsum zam.Lub kaum sab xis thiab lub kaum sab xis suav nrog yuav cuam tshuam rau kev ua haujlwm hluav taws xob hauv qhov hluav taws xob ntau zaus.Nyob rau hauv luv luv, txoj hlua ntawm cov ntawv luam tawm yuav tsum zoo ib yam, ntom thiab zoo ib yam.Sim zam kom tsis txhob siv cov ntawv loj loj ntawm cov ntawv ci hauv Circuit Court, txwv tsis pub, thaum tshav kub kub tsim tau ntev heev thaum siv, cov ntawv ci tooj liab yuav nthuav dav thiab poob tawm yooj yim.Yog tias yuav tsum tau siv cov ntawv xov tooj loj loj, cov kab sib chaws zoo li yuav siv tau.Lub davhlau ya nyob twg ntawm cov hlau yog lub ncoo.Lub qhov nruab nrab ntawm lub ncoo yog qhov loj dua li txoj kab uas hla ntawm cov khoom siv lead ua.Yog tias lub ncoo loj dhau lawm, nws yooj yim los tsim ib qho kev sib txuas virtual thaum vuam.Sab nraud txoj kab uas hla D ntawm lub ncoo feem ntau tsis tsawg dua (d + 1.2) mm, qhov twg d yog lub aperture.Rau qee qhov sib xyaw nrog kev ntom ntom ntom heev, qhov tsawg kawg ntawm lub qhov hluav taws xob ntawm cov ntaus ntawv tiav, tom qab tsim nyog los ntawm cov khoom siv ntawm cov ntawv luam tawm, thiab cov ntawv nyeem thiab cov cim yuav tsum tau cim tib lub sijhawm.Feem ntau, qhov siab ntawm cov ntawv los yog ncej yuav tsum nyob ib ncig ntawm 0.9mm, thiab kab dav yuav tsum nyob ib ncig ntawm 0.2mm.Thiab cov kab xws li cov ntawv cim thiab cov cim yuav tsum tsis txhob nias rau ntawm lub ncoo.Yog hais tias nws yog ob-txheej board, lub cim hauv qab yuav tsum tsom rau daim ntawv lo.
Qhov thib ob, txhawm rau ua kom cov khoom tsim tau ua haujlwm zoo dua thiab muaj txiaj ntsig zoo, PCB yuav tsum xav txog nws cov peev xwm tiv thaiv kev cuam tshuam hauv kev tsim, thiab nws muaj kev sib raug zoo nrog rau qhov tshwj xeeb Circuit Court.
Kev tsim cov kab hluav taws xob thiab cov kab hauv av hauv Circuit Board yog qhov tseem ceeb tshwj xeeb.Raws li qhov loj ntawm qhov tam sim no ntws los ntawm cov kab hluav taws xob sib txawv, qhov dav ntawm cov kab hluav taws xob yuav tsum tau nce ntxiv kom ntau li ntau tau kom txo tau lub voj voog tiv thaiv.Nyob rau tib lub sijhawm, cov kev taw qhia ntawm cov kab hluav taws xob thiab cov kab hauv av thiab cov ntaub ntawv Cov kev taw qhia ntawm kev sib kis tseem zoo ib yam.Pab txhawb rau kev txhim kho ntawm lub peev xwm los tiv thaiv lub suab nrov ntawm Circuit Court.Muaj ob lub logic circuits thiab linear circuits ntawm PCB, yog li ntawd lawv tau sib cais ntau li ntau tau.Qhov qis-zaus Circuit Court tuaj yeem txuas nrog tib lub ntsiab lus.Cov kab hluav taws xob tiag tiag tuaj yeem txuas nrog hauv series thiab tom qab ntawd txuas rau hauv kev sib txuas.Cov hlau hauv av yuav tsum luv thiab tuab.Cov ntawv loj hauv av tuaj yeem siv nyob ib puag ncig cov khoom siv ntau zaus.Cov hlau hauv av yuav tsum yog tuab li ua tau.Yog tias cov hlau hauv av nyias nyias, lub peev xwm hauv av yuav hloov nrog tam sim no, uas yuav txo qhov kev ua haujlwm ntawm lub suab nrov.Yog li ntawd, cov av xaim yuav tsum tau thickened kom nws thiaj li ncav cuag qhov tso cai tam sim no ntawm lub rooj tsav xwm hauv Circuit Court.Yog tias tus qauv tsim tso cai rau txoj kab uas hla hauv av xaim ntau dua 2-3 hli, hauv cov kab hluav taws xob digital, cov xaim hauv av tuaj yeem npaj rau hauv. ib lub voj los txhim kho lub peev xwm los tiv thaiv lub suab nrov.Hauv PCB tsim, tsim nyog decoupling capacitors feem ntau teeb tsa hauv qhov tseem ceeb ntawm cov ntawv luam tawm.Lub 10-100uF electrolytic capacitor txuas nrog hla txoj kab ntawm lub hwj chim tawm tswv yim kawg.Feem ntau, 0.01PF sib nqus nti capacitor yuav tsum tau teem caij ze ntawm lub hwj chim tus pin ntawm cov khoom sib txuas nrog 20-30 tus pins.Rau cov chips loj, cov hlau lead yuav muaj ob peb tus pins, thiab nws yog qhov zoo dua los ntxiv ib lub decoupling capacitor nyob ze lawv.Rau ib nti nrog ntau tshaj 200 pins, ntxiv tsawg kawg yog ob lub decoupling capacitors ntawm nws plaub sab.Yog tias qhov sib txawv tsis txaus, 1-10PF tantalum capacitor kuj tuaj yeem npaj rau ntawm 4-8 chips.Rau cov khoom uas tsis muaj zog tiv thaiv kev cuam tshuam thiab kev hloov pauv loj ntawm lub zog, lub decoupling capacitor yuav tsum tau txuas ncaj qha ntawm cov kab hluav taws xob thiab cov kab hauv av ntawm cov khoom., Tsis muaj teeb meem dab tsi ntawm cov hlau lead txuas nrog lub capacitor saum toj no, nws tsis yooj yim kom ntev dhau.
3. Tom qab cov khoom siv thiab kev tsim hluav taws xob ntawm lub rooj tsav xwm Circuit Court ua tiav, nws cov txheej txheem tsim yuav tsum tau txiav txim siab tom ntej, txhawm rau tshem tawm txhua yam tsis zoo ua ntej pib tsim khoom, thiab tib lub sijhawm, coj mus rau hauv tus account lub manufacturability. lub Circuit Court board thiaj li yuav tsim cov khoom zoo.thiab ntau lawm.
.. Thaum tham txog qhov chaw thiab xaim ntawm cov khoom, qee yam ntawm cov txheej txheem ntawm lub rooj tsav xwm Circuit Court tau koom nrog.Tus txheej txheem tsim ntawm lub rooj tsavxwm Circuit Court yog tsuas yog rau cov organically sib sau ua ke lub rooj tsavxwm Circuit Court thiab cov khoom peb tsim los ntawm SMT cov kab ntau lawm, thiaj li ua tau zoo hluav taws xob sib txuas thiab ua tiav txoj hauj lwm layout ntawm peb cov khoom tsim.Pad tsim, xaim thiab tiv thaiv kev cuam tshuam, thiab lwm yam kuj yuav tsum tau txiav txim siab seb lub rooj tsavxwm uas peb tsim tau yooj yim los tsim, txawm tias nws tuaj yeem sib sau ua ke nrog cov cuab yeej niaj hnub sib dhos-SMT technology, thiab tib lub sijhawm, nws yog ib qho tsim nyog yuav tsum tau ua kom tau raws li qhov xav tau. cov xwm txheej uas tsis tso cai rau cov khoom tsis raug tsim tawm thaum lub sijhawm tsim khoom.siab.Tshwj xeeb, muaj cov hauv qab no:
1: Cov kab sib txawv SMT ntau lawm muaj cov xwm txheej ntau lawm, tab sis hais txog qhov loj ntawm PCB, ib lub rooj tsav xwm loj ntawm PCB tsis tsawg dua 200 * 150mm.Yog hais tias sab ntev me dhau lawm, siv tau, thiab qhov sib piv ntawm qhov ntev mus rau qhov dav yog 3: 2 lossis 4: 3.Thaum qhov loj ntawm lub rooj tsav xwm Circuit Court yog ntau dua 200 × 150mm, lub zog txhua yam ntawm lub rooj tsavxwm yuav tsum tau txiav txim siab.
2: Thaum qhov loj ntawm lub rooj tsav xwm Circuit Court me dhau, nws nyuaj rau tag nrho SMT kab ntau lawm txheej txheem, thiab nws tsis yooj yim los tsim hauv cov khoom siv.Txoj hauv kev zoo tshaj plaws yog siv daim ntawv board, uas yog sib xyaw ua ke 2, 4, 6 thiab lwm cov boards raws li qhov loj ntawm lub rooj tsavxwm.Ua ke ua ke los tsim ib lub rooj tsav xwm tag nrho tsim nyog rau kev tsim khoom loj, qhov loj ntawm tag nrho lub rooj tsavxwm yuav tsum tsim nyog rau qhov loj ntawm cov khoom sib txuas.
3: Yuav kom hloov mus rau qhov chaw ntawm cov kab ntau lawm, lub veneer yuav tsum tawm ntawm qhov ntau ntawm 3-5mm yam tsis muaj cov khoom, thiab lub vaj huam sib luag yuav tsum tawm ntawm 3-8mm txheej txheem ntug.Muaj peb hom kev sib txuas ntawm cov txheej txheem ntug thiab PCB: A tsis muaj kev sib tshooj, muaj lub tank sib cais, B muaj ib sab thiab lub tank sib cais, thiab C muaj ib sab thiab tsis muaj lub tank sib cais.Nruab nrog cov txheej txheem xuas nrig ntaus.Raws li cov duab ntawm PCB pawg thawj coj saib, muaj ntau hom jigsaw boards, xws li Youtu.Cov txheej txheem sab ntawm PCB muaj ntau txoj hauv kev sib txawv raws li cov qauv sib txawv, thiab qee qhov muaj qhov chaw nyob ntawm cov txheej txheem sab.Txoj kab uas hla ntawm lub qhov yog 4-5 cm.Hais txog hais lus, qhov tseeb ntawm qhov chaw yog siab dua li ntawm sab, yog li muaj Cov qauv nrog lub qhov chaw yuav tsum tau muab nrog qhov chaw qhov chaw thaum lub sij hawm ua PCB, thiab lub qhov tsim yuav tsum yog tus qauv kom tsis txhob muaj teeb meem rau kev tsim khoom.
4: Txhawm rau kom ua tiav txoj haujlwm zoo dua thiab ua tiav qhov raug siab dua, nws yog qhov yuav tsum tau teeb tsa lub ntsiab lus siv rau PCB.Txawm hais tias muaj qhov taw qhia siv thiab seb qhov teeb tsa zoo lossis tsis zoo yuav cuam tshuam ncaj qha rau kev tsim khoom loj ntawm SMT cov kab ntau lawm.Cov duab ntawm cov ntsiab lus siv tuaj yeem yog square, ncig, daim duab peb sab, thiab lwm yam. Thiab txoj kab uas hla yuav tsum nyob rau hauv thaj tsam ntawm 1-2mm, thiab qhov chaw nyob ib puag ncig ntawm qhov siv taw tes yuav tsum nyob rau hauv thaj tsam ntawm 3-5mm, tsis muaj cov khoom siv thiab coj.Nyob rau tib lub sijhawm, qhov taw qhia siv yuav tsum du thiab tiaj tus yam tsis muaj kuab paug.Kev tsim cov ntsiab lus siv yuav tsum tsis txhob ze rau ntawm ntug ntawm lub rooj tsavxwm, yuav tsum muaj qhov deb ntawm 3-5mm.
5: Los ntawm kev xaav ntawm tag nrho cov txheej txheem ntau lawm, cov duab ntawm lub rooj tsavxwm zoo dua pitch-zoo li tus, tshwj xeeb tshaj yog rau yoj soldering.Rectangular rau kev xa khoom yooj yim.Yog tias muaj qhov ploj lawm ntawm PCB lub rooj tsavxwm, qhov zawj uas ploj lawm yuav tsum tau ntim rau hauv daim ntawv ntawm cov txheej txheem ntug, thiab ib qho SMT board raug tso cai kom muaj qhov ploj lawm.Tab sis qhov ploj lawm tsis yooj yim kom loj dhau thiab yuav tsum tsawg dua 1/3 ntawm qhov ntev ntawm sab.
Post lub sij hawm: May-06-2023