mushure PCB dhizaini yapera, zvese zvichanaka? Kutaura zvazviri, izvi hazvisizvo. Mukugadzirisa kwePCB, matambudziko akasiyana-siyana anowanzosangana, senge tini inoenderera mberi mushure mekutengesa kwemafungu. Ehe, haasi matambudziko ese ari “hari” yePCB dhizaini, asi sevagadziri, isu tinofanira kutanga tive nechokwadi chekuti dhizaini yedu yakasununguka.

Glossary

Wave soldering

Wave soldering ndeyekugadzira iyo inotenderedza pamusoro pe plug-in bhodhi yakanangana nepamusoro-tembiricha yemvura tin kuzadzisa chinangwa chekutengesa. Iyo yepamusoro-tembiricha yemvura tin inochengetedza mutsetse, uye yakakosha mudziyo inoita kuti mvura yeti iite senge wave phenomenon, saka inonzi “wave soldering”. Nyaya huru ndeye solder bars.

Sei bhodhi rePCB richionekwa nerata mushure mekutengesa kwemafungu? Nzira yekuzvidzivirira sei?

Wave soldering process

Majoini maviri kana anopfuura anotengeswa akabatanidzwa ne solder, zvichikonzera kusatarisika kwakanaka uye kushanda, izvo zvinotsanangurwa seyero yekuremara ne IPC-A-610D.

Sei bhodhi rePCB richionekwa nerata mushure mekutengesa kwemafungu?

Chokutanga pane zvose, tinofanira kujekesa kuti kuvapo kwetin paPCB board haisi dambudziko rekugadzirisa PCB. Izvo zvinogona zvakare kuve nekuda kwekushata kwekuita basa, kusakwana kunyorova, kusaenzana application, preheating uye solder tembiricha panguva wave soldering. Zvakanaka kumirira chikonzero.

Kana iri PCB dhizaini dambudziko, tinogona kufunga kubva pane zvinotevera zvinhu:

1. Kana chinhambwe chiri pakati pemajoini emasoja emuchina weave soldering chakakwana;

2. Iyo nzira yekufambisa yeplug-in inonzwisisika here?

3. Muchiitiko chekuti pitch haizadzise zvinodiwa pakuita, pane chero marata ekubira pedhi neingi yesirikiri sikirini yakawedzerwa?

4. Kunyangwe kureba kwepini-plug-in kwakareba, nezvimwe.

Nzira yekudzivirira sei kunyange tini muPCB dhizaini?

1. Sarudza zvikamu zvakakodzera. Kana bhodhi richida wave soldering, inokurudzirwa mudziyo spacing (center spacing pakati pePINs) yakakura kudarika 2.54mm, uye inokurudzirwa kuti ive yakakura kudarika 2.0mm, zvikasadaro njodzi yekubatanidza tini yakanyanya. Pano iwe unogona kunyatso gadzirisa padhi yakagadziridzwa kuti isangane neiyo tekinoroji yekugadzirisa uchidzivirira tini kubatana.

2. Usapinda netsoka ye soldering kupfuura 2mm, kana zvisina kudaro zviri nyore kwazvo kubatanidza tini. Kukosha kwe empirical, kana kureba kwekutungamira kunze kwebhodhi kuri ≤1mm, mukana wekubatanidza tini yedense-pini socket ichaderedzwa zvakanyanya.

3. Nharaunda pakati pezvindori zvemhangura haifaniri kunge iri pasi pe 0.5mm, uye mafuta machena anofanira kuwedzerwa pakati pezvindori zvemhangura. Ichi ndicho chikonzero isu tichiwanzoisa dhizaini yemafuta chena yesilika pane welding pamusoro peplug-in kana uchigadzira. Munguva yekugadzira, kana padhi yakavhurwa munzvimbo ye solder mask, teerera kuti udzivise mafuta machena pane sirika skrini.

4. Bhiriji remafuta rakasvibirira rinofanira kunge risingasviki 2mil (kunze kwekukwira kwepini-yakadzika machipisi akadai seQFP mapakeji), kana zvisina kudaro zviri nyore kukonzera kuwirirana kwetini pakati pemapadhi panguva yekugadzirisa.

5. Kureba kutungamirirwa kwezvikamu kunopindirana nehutungamiri hwekufambisa kwebhodhi mumugwagwa, saka nhamba yepini yekubata kubatanidzwa kwetini ichaderedzwa zvikuru. Muhunyanzvi PCB dhizaini dhizaini, dhizaini inosarudza kugadzirwa, saka iyo nzira yekufambisa uye yekumisikidzwa kweave wave soldering zvishandiso zvinonyanya kunaka.

6. Wedzera tin kuba mapedhi, wedzera matani ekubira mapedhi pamagumo ekufambisa kwekufambisa maererano nezvinodiwa zvekugadzirisa plug-in pabhodhi. Ukuru hwematani ekuba padhi hunogona kugadziriswa zvakakodzera maererano nekuwanda kwebhodhi.

7. Kana iwe uchifanira kushandisa denser pitch plug-in, tinogona kuisa solder drag piece panzvimbo yepamusoro yetini yegadziriro yekudzivirira iyo solder paste kubva pakugadzira uye kuita kuti chikamu chetsoka chibatanidze kune tini.