Dhizaini yePCB yakawanda (yakadhindwa yedunhu bhodhi) inogona kuve yakaoma kwazvo. Iyo iyo iyo dhizaini inotoda kushandiswa kweanopfuura maviri akaturikidzana zvinoreva kuti inodiwa nhamba yemaseketi haizokwanisi kuiswa chete pamusoro uye pasi pepamusoro. Kunyangwe kana dunhu richikwana mumatanho maviri ekunze, mugadziri wePCB anogona kusarudza kuwedzera simba uye pasi pasi mukati kuti agadzirise kukanganisa kwekuita.

Kubva kuzvinhu zvinopisa kusvika kune yakaoma EMI (Electromagnetic Interference) kana ESD (Electrostatic Discharge) nyaya, kune zvakawanda zvakasiyana zvinhu zvinogona kutungamira kune suboptimal yedunhu kuita uye inoda kugadziriswa nekubviswa. Nekudaro, kunyangwe basa rako rekutanga semugadziri kuri kugadzirisa matambudziko emagetsi, zvakakosha zvakaenzana kuti usaregeredze kurongeka kwemuviri webhodhi redunhu. Mabhodhi akasimba emagetsi anogona kunge achiri kukotama kana kumonyoroka, zvichiita kuti gungano riome kana kusatoita. Neraki, kutarisisa kuPCB kumisikidzwa kwemuviri panguva yedhizaini kutenderera kunoderedza matambudziko egungano remangwana. Layer-to-layer balance ndechimwe chezvinhu zvakakosha zvebhodhi rakagadzikana redunhu.

01
Yakaenzana PCB stacking

Balanced stacking is a stack umo iyo layer pamusoro uye muchinjika-sectional chimiro cheyakadhindwa redunhu bhodhi zvese zvine symmetrical. Chinangwa ndechekubvisa nzvimbo dzinogona kukanganisa kana dzichiiswa kushushikana panguva yekugadzira, kunyanya panguva yelamination phase. Kana bhodhi redunhu rakaremara, zvakaoma kuriisa sandara kuitira gungano. Izvi ndezvechokwadi kunyanya kumatunhu mabhodhi ayo achaunganidzwa pane otomatiki pamusoro pegomo uye mitsara yekuisa. Muzviitiko zvakanyanyisa, deformation inogona kutotadzisa kuungana kwePCBA yakaungana (yakadhindwa redunhu bhodhi musangano) muchigadzirwa chekupedzisira.

IPC's inspection standards inofanira kudzivirira mabhodhi akakombama zvakanyanya kusvika pamidziyo yako. Zvakangodaro, kana iyo PCB mugadziri maitiro asina zvachose kunze kwekutonga, saka iyo midzi yekukombama kwakawanda ichiri hukama nedhizaini. Naizvozvo, zvinokurudzirwa kuti unyatso tarisa PCB marongerwo uye ita gadziriso dzinodiwa usati waisa yako yekutanga prototype odha. Izvi zvinogona kudzivirira goho rakashata.

02
Circuit board chikamu

Chikonzero chakajairwa dhizaini ndechekuti yakadhindwa redunhu bhodhi haizokwanise kuwana inogamuchirika flatness nekuti yayo muchinjika-chikamu chimiro is asymmetric nezvepakati payo. Semuyenzaniso, kana 8-layer dhizaini inoshandisa 4 masiginecha akaturikidzana kana mhangura pamusoro pepakati inovhara zvishoma zvishoma ndege dzemuno uye 4 ndege dzakasimba pazasi, kushushikana kune rumwe rutivi rwestack kunoenderana neimwe kunogona kukonzera Mushure mekucheka, kana izvo zvinhu. yakashongedzwa nekudziya nekutsikirira, iyo laminate yese ichave yakaremara.

Nokudaro, itsika yakanaka yekugadzira stack kuitira kuti rudzi rwemhangura yemhangura (ndege kana chiratidzo) inoratidzirwa maererano nechepakati. Mumufananidzo uri pazasi, mhando dzepamusoro uye dzepasi dzinoenderana, L2-L7, L3-L6 uye L4-L5 mechi. Pamwe kuvharwa kwemhangura pazvikamu zvese zvechiratidzo kunofananidzwa, nepo planar layer inoumbwa nemhangura yakasimba yakakandwa. Kana izvi zviri izvo, saka bhodhi redunhu rine mukana wakanaka wekupedzisa flat, flat surface, iyo yakanaka kune automated assembly.

03
PCB dielectric layer ukobvu

Iyo zvakare tsika yakanaka yekuenzanisa ukobvu hweiyo dielectric layer yeiyo yese stack. Sezvineiwo, ukobvu hwega ega dielectric layer hunofanirwa kuratidzwa nenzira yakafanana semhando yedhiri inotaridzwa.

Kana ukobvu hwakasiyana, zvingava zvakaoma kuwana boka rezvinhu zviri nyore kugadzira. Dzimwe nguva nekuda kwezvimiro zvakaita seantenna traces, asymmetric stacking inogona kunge isingadzivisike, nekuti chinhambwe chakakura kwazvo pakati peantenna trace nendege yereferensi inogona kudikanwa, asi ndapota ita shuwa yekuongorora nekupedza zvese usati waenderera. Dzimwe sarudzo. Kana kusaenzana kwedielectric spacing kuchidikanwa, vagadziri vazhinji vanokumbira kuzorora kana kusiya zvachose uta uye kumonyorora kushivirira, uye kana vasingakwanise kukanda mapfumo pasi, vanogona kutorega basa. Ivo havadi kuvakazve akati wandei anodhura mabhechi ane goho rakaderera, uye pakupedzisira kuwana akakwana akakodzera mayuniti kuti asangane neiyo yekutanga odha huwandu.

04
PCB ukobvu dambudziko

Uta uye kumonyoroka ndiwo akajairika matambudziko emhando. Kana stack yako isina kuenzana, pane imwe mamiriro ayo dzimwe nguva anokonzera kukakavara mukupedzisira kuongorora-iyo yakazara PCB ukobvu panzvimbo dzakasiyana pabhodhi redunhu ichachinja. Mamiriro ezvinhu aya anokonzerwa nekuita sediki dhizaini etariro uye haina kujairika, asi inogona kuitika kana dhizaini yako ichigara iine kuvharika kwemhangura isina kuenzana pamatanho akawanda munzvimbo imwechete. Inowanzoonekwa pamapuranga anoshandisa zvishoma 2 ounces emhangura uye nhamba yakawanda yezvikamu. Zvakaitika ndezvekuti imwe nzvimbo yebhodhi yaive nenzvimbo yakakura yakadirwa mhangura, nepo imwe yacho yaive isina mhangura. Kana aya akaturikidzana akaiswa pamwe chete, divi rine mhangura rinotsikirirwa kusvika pakukora, ukuwo divi risina mhangura kana kuti risina mhangura rinotsikirirwa pasi.

Mazhinji mapuranga edunhu anoshandisa hafu aunzi yemhangura haizokanganisike zvakanyanya, asi iyo inorema mhangura, iyo yakakura kurasikirwa kwekukora. Semuenzaniso, kana uine zvikamu zvisere zvemaonzi matatu emhangura, nzvimbo dzine mhangura yakareruka dzinokwanisa kudonha zviri nyore pasi pehuwandu hwekushivirira. Kuti izvi zvisaitike, iva nechokwadi chekudururira mhangura muchikamu chese chepamusoro. Kana izvi zvisingaite pakufunga nezvemagetsi kana huremu, wedzera mamwe akavharwa nemumaburi parukukwe rwemhangura uye ita shuwa kuti unosanganisira mapedhi emaburi pane imwe neimwe layer. Aya magomba / padhi zvimiro zvinopa tsigiro yemuchina paY axis, nekudaro ichidzikisa kurasikirwa kwekukora.

05
Kupira kubudirira

Kunyangwe kana uchigadzira uye nekuisa akawanda-layer PCBs, iwe unofanirwa kutarisisa kune ese emagetsi kuita uye chimiro chemuviri, kunyangwe iwe uchifanira kuregeredza pazvinhu zviviri izvi kuti uwane inoshanda uye inogadzirwa yakazara dhizaini. Paunenge uchiyera zvisarudzo zvakasiyana-siyana, yeuka kuti kana zvakaoma kana zvisingabviri kuzadza chikamu nekuda kwekushandurwa kwehuta uye mafomu akamonyoroka, dhizaini ine maitiro akakwana emagetsi haashandi zvishoma. Balance stack uye teerera kune kugoverwa kwemhangura pane imwe neimwe layer. Aya matanho anowedzera mukana wekupedzisira kuwana bhodhi redunhu riri nyore kuunganidza uye kuisa.