Pcb bhodhi dambudziko redunhu pfupi

Chikonzero chikuru chePCB ipfupi dhizaini haina kunaka padhi dhizaini. Panguva ino, denderedzwa padhi inogona kuchinjwa kuva elliptical chimiro kuwedzera chinhambwe pakati pemapoinzi, kuitira kudzivirira mapfupi maseketi.

Dhizaini isina kufanira yePCB board zvikamu zvinokonzeresa kupfupika kwebhodhi redunhu, zvichikonzera kusashanda. Kana pini yeSOIC ichienderana netini wave, zviri nyore kukonzera tsaona yedunhu pfupi. Muchiitiko ichi, kutungamirirwa kwechikamu kunogona kuchinjwa kuva perpendicular kune tin wave.

Chimwe chikonzero ndechekuti PCB board ipfupi-inotenderera, ndiko kuti, otomatiki plug-in unit yakakotama. Sezvo IPC inotaura kuti kureba kwewaya kushoma kupfuura 2mm, kana kona yekukotama yakakura kwazvo, chikamu chakakura uye zviri nyore kukonzera pfupi pfupi. Iyo solder joint inopfuura 2mm kure nedunhu.

Pamusoro pezvikonzero zvitatu zviri pamusoro apa, pane zvimwe zvikonzero zvinogona kukonzera kutadza kwedunhu kupfupi pane PCB board. Semuenzaniso, iyo substrate gomba yakakura kwazvo, tembiricha yevira yerata yakadzikira, iyo solderability yebhodhi yepamusoro haina kunaka, solder mask haina kukodzera, uye bhodhi. Kusvibiswa kwepamusoro nezvimwe ndizvo zvinowanzokonzera kukanganisa. Injiniya inogona kubvisa uye kutarisa zvikonzero zviri pamusoro uye zvikanganiso chimwe nechimwe.

4 nzira dzekuvandudza PCB yakagadzika chinzvimbo pfupi dunhu

Short-circuit fixed short-circuit short-circuit improvement PCB inonyanya kukonzerwa nekukwenya pamutsetse wekugadzira firimu kana marara kuvhara pachiratidziro chakavharwa. Iyo yakavharwa anti-plating layer inooneswa kumhangura uye inokonzera pfupi pfupi muPCB. Magadzirirwo acho ndeaya anotevera:

Iyo firimu iri pafirimu haifaniri kuva nezvinetso zvakadai se trachoma, scratches, etc. Kana yaiswa, nzvimbo yefirimu inofanira kutarisana uye haifaniri kukwesha kune zvimwe zvinhu. Paunenge uchikopa firimu, firimu inotarisana nepamusoro pefirimu, uye firimu yakakodzera inotakurwa munguva. Chengetedza muhomwe yefirimu.

Kana iyo firimu yakatarisana, inotarisana nePCB pamusoro. Paunenge uchipfura firimu, tora diagonal nemaoko maviri. Usabate zvimwe zvinhu kuti usakwenya pamusoro pefirimu. Apo ndiro inosvika kune imwe nhamba, firimu rega rega rinofanira kumira kuenderana. Tarisa kana kutsiva nemaoko. Isa muhombodo yefirimu yakakodzera uye uichengete.

Vashandi havafaniri kupfeka chero zvishongedzo, zvakadai semhete, zvishongo, nezvimwewo. Zvipikiri zvinofanira kuchekwa uye kuchengetwa mubindu. Hapana tsvina inofanira kuiswa pamusoro petafura, uye pamusoro petafura inofanira kuva yakachena uye yakatsetseka.

Usati wagadzira iyo skrini vhezheni, inofanirwa kunyatsotariswa kuti ive nechokwadi chekuti hapana matambudziko. Screen version. Paunenge uchishandisa firimu rakanyorova, zvinowanzodikanwa kutarisa pepa kuti uone kana pane jamu repepa pachiratidziro. Kana pasina nguva yekudhinda, unofanira kuprinda sikirini isina chinhu kakawanda usati wadhinda kuitira kuti iyo yakatetepa muinki inyatso kunyungudutsa inki yakaomeswa kuitira kuti sikirini ibude zvakanaka.

PCB bhodhi pfupi yedunhu yekuongorora nzira

Kana iri manual welding, zvakakosha kukudziridza tsika dzakanaka. Chekutanga pane zvese, tarisa tarisa PCB board usati watengesa, uye shandisa multimeter kutarisa kana masekete akakosha (kunyanya magetsi uye pasi) ari mapfupi-anotenderera. Chechipiri, tengesa chip nguva dzese. Shandisa multimeter kuyera kana magetsi uye pasi zvakapfupika-kutenderera. Mukuwedzera, usatengesa simbi paunenge uchitengesa. Kana solder inotengeswa kune solder tsoka dze chip (kunyanya pamusoro pepamusoro mount components), hazvisi nyore kuwana.

Vhura PCB pakombuta, vhenekera iyo pfupi-yedunhu network, uye woona kana iri padyo nayo uye iri nyore kubatanidza. Ndokumbira utarise zvakanyanya kupfupi wemukati weIC.

Dunhu pfupi rakawanikwa. Tora bhodhi kuti ucheke mutsara (kunyanya single/double board). Mushure mekucheka, chikamu chimwe nechimwe chevhavha yebasa chinosimbiswa zvakasiyana, uye zvimwe zvikamu hazvina kubatanidzwa.

Shandisa short-circuit location analyzer, yakadai se: Singapore PROTEQ CB2000 short-circuit tracker, Hong Kong Ganoderma QT50 short-circuit tracker, British POLAR ToneOhm950 multi-layer board short-circuit detector.

Kana paine BGA chip, sezvo majoini ese solder asina kuvharwa nechip, uye iri multi-layer board (anopfuura 4 layers), zviri nani kushandisa magineti bead kana 0 ohm kuparadzanisa simba reimwe neimwe. chip mukugadzira. Iyo resistor yakabatana kuitira kuti kana simba rekushandisa riri pfupi-kutenderera pasi, magineti mabhesi anoonekwa uye zviri nyore kutsvaga imwe chip. Nekuti BGA yakaoma kutengesa, kana isiri otomatiki solder yemuchina, iyo yakatarisana nemagetsi uye pasi solder mabhora anozonyatso kupfupikiswa.

Chenjerera paunenge uchitengesa maawa-mahombe uye madiki pamusoro pekukwira capacitors, kunyanya simba sefa capacitors (103 kana 104), anogona nyore kukonzera pfupi pfupi pakati pemagetsi uye pasi. Zvechokwadi, dzimwe nguva nerombo rakaipa, iyo capacitor pachayo ichaita pfupi-circuit, saka nzira yakanakisisa ndeyokutarisa capacitor isati yatengeswa.