Lub CCL (Copper Clad Laminate) yog siv qhov chaw seem ntawm PCB raws li qib siv, tom qab ntawd sau nws nrog cov khoom tooj liab, uas tseem hu ua tooj liab pouring.
Qhov tseem ceeb ntawm CCL raws li hauv qab no:
- txo av impedance thiab txhim kho kev tiv thaiv kev cuam tshuam
- txo voltage poob thiab txhim kho lub zog efficiency
- txuas nrog hauv av thiab tuaj yeem txo qhov chaw ntawm lub voj voog.
Raws li qhov txuas tseem ceeb ntawm PCB tsim, tsis hais hauv tsev Qingyue Feng PCB tsim software, kuj muaj qee qhov txawv teb chaws Protel, PowerPCB tau muab cov khoom siv tooj liab ntse, yog li yuav ua li cas siv tooj liab zoo, Kuv yuav qhia qee yam ntawm kuv tus kheej lub tswv yim nrog koj, vam tias yuav coj txiaj ntsig rau kev lag luam.
Tam sim no txhawm rau ua kom PCB vuam kom deb li deb tau yam tsis muaj deformation, feem ntau cov tuam txhab PCB tseem yuav xav tau tus tsim PCB los sau qhov chaw qhib ntawm PCB nrog tooj liab lossis kab sib chaws zoo li hauv av. Yog tias CCL tsis ua haujlwm zoo, nws yuav ua rau muaj txiaj ntsig tsis zoo. Puas yog CCL "zoo dua li kev puas tsuaj" lossis "qhov phem tshaj qhov zoo"?
Nyob rau hauv cov xwm txheej ntawm lub siab zaus, nws yuav ua haujlwm ntawm cov ntawv luam tawm Circuit Court wiring capacitance, thaum qhov ntev yog ntau tshaj 1/20 ntawm lub suab nrov zaus sib xws wavelength, ces tuaj yeem tsim cov nyhuv kav hlau txais xov, lub suab nrov yuav tawm los ntawm kev xaim, yog tias muaj qhov tsis zoo hauv av CCL hauv PCB, CCL tau dhau los ua lub cuab yeej ntawm cov suab nrov kis tau tus mob, yog li ntawd, nyob rau hauv high zaus Circuit Court, tsis txhob ntseeg hais tias yog tias koj txuas ib lub hauv av xaim rau hauv av, qhov no yog "hauv av", qhov tseeb. , nws yuav tsum tsawg tshaj li qhov sib nrug ntawm λ/20, xuas nrig ntaus ib lub qhov nyob rau hauv lub cabling thiab multilayer av dav hlau "zoo grounded". Yog tias CCL raug tswj kom raug, nws tuaj yeem tsis tsuas yog nce qhov tam sim no, tab sis kuj ua si lub luag haujlwm ntawm kev tiv thaiv kev cuam tshuam.
Muaj ob txoj hauv kev ntawm CCL, uas yog thaj tsam loj tooj liab cladding thiab mesh tooj liab, feem ntau kuj nug, qhov twg yog qhov zoo tshaj plaws, nws nyuaj rau hais. Vim li cas? Loj cheeb tsam ntawm CCL, nrog rau qhov nce ntawm tam sim no thiab shielding dual lub luag hauj lwm, tab sis muaj loj cheeb tsam ntawm CCL, lub rooj tsavxwm yuav ua warped, txawm npuas yog los ntawm cov yoj soldering.Yog li ntawd, feem ntau kuj yuav qhib ob peb qhov rau alleviate lub bubbling tooj liab, lub mesh CCL yog tsuas yog shielding, ua rau lub luag hauj lwm ntawm lub tam sim no yog txo, Los ntawm qhov kev xav ntawm tshav kub dissipation, daim phiaj muaj txiaj ntsig (nws txo cov cua sov saum npoo ntawm tooj liab) thiab ua lub luag haujlwm ntawm electromagnetic shielding. Tab sis nws yuav tsum tau taw qhia tias daim phiaj yog tsim los ntawm kev sib hloov kev taw qhia ntawm kev khiav, peb paub txog kab dav rau kev ua haujlwm zaus ntawm lub rooj tsavxwm Circuit Court muaj nws qhov "hluav taws xob" ntev ntawm (qhov loj tiag tiag muab faib los ntawm kev ua haujlwm zaus ntawm cov khoom siv digital. zaus, cov phau ntawv pob zeb), thaum lub sijhawm ua haujlwm tsis siab, tej zaum lub luag haujlwm ntawm cov kab hluav taws xob tsis pom tseeb, ib zaug qhov hluav taws xob ntev thiab kev ua haujlwm zaus sib piv, yog qhov phem heev, koj yuav pom tias lub voj voog yuav tsis ua haujlwm zoo, emission teeb liab cuam tshuam qhov system ua haujlwm nyob txhua qhov chaw.Yog li ntawd, rau cov neeg siv kab sib chaws, kuv cov lus qhia yog xaiv raws li kev ua haujlwm ntawm lub rooj tsav xwm Circuit Court tsim, tsis yog tuav rau ib yam.Yog li ntawd, cov kev xav tau ntau zaus Circuit Court tiv thaiv kev cuam tshuam ntawm cov multi-purpose daim phiaj, tsis tshua muaj zaus Circuit Court nrog high tam sim no Circuit Court thiab lwm yam uas feem ntau siv ua tiav tooj liab.
Ntawm CCL, txhawm rau cia nws ua tiav peb qhov kev xav tau, ces CCL yam yuav tsum tau ua tib zoo saib xyuas cov teeb meem dab tsi:
1. Yog tias hauv av ntawm PCB ntau dua, muaj SGND, AGND, GND, thiab lwm yam, yuav nyob ntawm txoj hauj lwm ntawm PCB lub ntsej muag, feem ntau ua rau lub ntsiab "hauv av" raws li qhov taw qhia rau kev ywj pheej CCL, rau digital thiab analog rau cais tooj liab, ua ntej tsim cov CCL, ua ntej ntawm tag nrho cov, bold coj lub hwj chim cords: 5.0 V, 3.3 V, thiab lwm yam, nyob rau hauv no txoj kev, ib tug xov tooj ntawm txawv cov duab yog tsim ntau deformation qauv.
2. Rau ib qho kev sib txuas ntawm qhov chaw sib txawv, txoj kev yog txuas los ntawm 0 ohm tsis kam lossis cov hlaws sib nqus lossis inductance;
3. CCL nyob ze ntawm lub crystal oscillator. Crystal oscillator nyob rau hauv Circuit Court yog ib tug high zaus emission qhov chaw. Cov txheej txheem yog los puag ncig cov siv lead ua oscillator nrog tooj liab cladding thiab tom qab ntawd hauv av lub plhaub ntawm cov siv lead ua oscillator cais.
4.Qhov teeb meem ntawm qhov chaw tuag, yog tias xav tias nws loj heev, ces ntxiv ib qho av ntawm nws.
5. Thaum pib ntawm kev xaim, yuav tsum tau kho kom sib npaug rau hauv av xaim, peb yuav tsum xaim hauv av zoo thaum xaim, tsis tuaj yeem tso siab rau ntxiv cov vias thaum tiav CCL kom tshem tawm cov av pin rau kev sib txuas, cov nyhuv no zoo heev. phem.
6. Nws yog qhov zoo dua kom tsis txhob muaj lub kaum ntse ntse ntawm lub rooj tsavxwm (= 180 °), vim tias los ntawm qhov pom ntawm electromagnetism, qhov no yuav tsim ib lub kav hlau txais xov, yog li kuv xav kom siv cov npoo ntawm lub arc.
7. Multilayer nruab nrab txheej thaiv qhov chaw seem, tsis txhob tooj liab, vim nws nyuaj ua rau CCL rau "grounded"
8. cov hlau hauv cov khoom siv, xws li hlau radiator, hlau reinforcement strip, yuav tsum ua tiav "zoo hauv av".
9.Qhov txias hlau thaiv ntawm peb lub davhlau ya nyob twg voltage stabilizer thiab txoj siv hauv av sib cais nyob ze ntawm cov siv lead ua oscillator yuav tsum tau zoo hauv av. Hauv ib lo lus: CCL ntawm PCB, yog tias qhov teeb meem hauv av tau daws tau zoo, nws yuav tsum yog "zoo dua li qhov phem", nws tuaj yeem txo cov teeb liab kab rov qab, txo cov teeb liab sab nraud electromagnetic cuam tshuam.