{"id":4212,"date":"2025-10-28T07:56:54","date_gmt":"2025-10-28T07:56:54","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4212"},"modified":"2025-10-28T07:59:30","modified_gmt":"2025-10-28T07:59:30","slug":"what-you-need-to-know-to-design-your-pcb","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/fi\/what-you-need-to-know-to-design-your-pcb\/","title":{"rendered":"Mit\u00e4 sinun on tiedett\u00e4v\u00e4 PCB:n suunnittelemiseksi"},"content":{"rendered":"

Piirilevysuunnittelu perustuu piirikaavioon piirisuunnittelijan tarvitsemien toimintojen toteuttamiseksi. PCB-suunnittelu<\/a> on hyvin teknist\u00e4 ty\u00f6t\u00e4, ja se vaatii monen vuoden kokemuksen kartuttamista. Seuraavat piirilevyvalmistajat ovat tiivist\u00e4neet useita PCB-piirien suunnittelun yleisi\u00e4 ongelmia viitteeksi.<\/p>\n\n\n\n

Ensimm\u00e4inen. Tyynyjen p\u00e4\u00e4llekk\u00e4isyys<\/h2>\n\n\n\n
    \n
  1. Tyynyjen p\u00e4\u00e4llekk\u00e4isyys (lukuun ottamatta pinta-asennettavia tyynyj\u00e4) tarkoittaa reikien p\u00e4\u00e4llekk\u00e4isyytt\u00e4. Porausprosessin aikana poranter\u00e4 rikkoutuu, koska porataan useita reiki\u00e4 yhteen paikkaan, jolloin rei\u00e4t vaurioituvat.<\/li>\n\n\n\n
  2. Kaksi reik\u00e4\u00e4 monikerroksisessa levyss\u00e4 on p\u00e4\u00e4llekk\u00e4in. Esimerkiksi yksi reik\u00e4 on eristyslevy ja toinen reik\u00e4 on liit\u00e4nt\u00e4tyyny (kukkatyyny), joten kalvo n\u00e4kyy eristyslevyn\u00e4 kalvon piirt\u00e4misen j\u00e4lkeen, jolloin syntyy romua.<\/li>\n<\/ol>\n\n\n\n

    Toinen. Grafiikkakerroksen v\u00e4\u00e4rink\u00e4ytt\u00f6<\/h2>\n\n\n\n
      \n
    1. Joillakin grafiikkatasoilla tehtiin joitakin turhia kytkent\u00f6j\u00e4. Alun perin kyseess\u00e4 oli nelikerroksinen piirilevy, mutta se suunniteltiin yli viiden kerroksen johdotuksilla, mik\u00e4 aiheutti v\u00e4\u00e4rink\u00e4sityksi\u00e4.<\/li>\n\n\n\n
    2. S\u00e4\u00e4st\u00e4 vaivaa suunnittelun aikana. Ota Protel-ohjelmisto esimerkiksi piirt\u00e4m\u00e4\u00e4n linjat jokaiselle kerrokselle Board-kerroksella ja k\u00e4yt\u00e4 Board-kerrosta linjojen merkitsemiseen. T\u00e4ll\u00e4 tavoin kevyit\u00e4 piirustustietoja suoritettaessa, koska Board-kerrosta ei ole valittu, se j\u00e4tet\u00e4\u00e4n pois. Yhteys katkeaa tai se voi olla oikosulussa Board-kerroksen merkint\u00e4viivan valinnan vuoksi, joten grafiikkakerroksen eheys ja selkeys s\u00e4ilyy suunnittelun aikana.<\/li>\n\n\n\n
    3. Tavanomaisen suunnittelun rikkominen, kuten komponentin pinnan suunnittelu pohjakerroksessa ja hitsauspinnan suunnittelu yl\u00e4kerroksessa, aiheuttaa haittaa.<\/li>\n<\/ol>\n\n\n\n

      Kolmanneksi. Hahmojen satunnainen sijoittelu<\/h2>\n\n\n\n
        \n
      1. Merkin kansilevyn SMD-juotosalusta aiheuttaa haittaa painetun levyn jatkuvuustestaukselle ja komponenttien juottamiselle.<\/li>\n\n\n\n
      2. Liian pienet merkit aiheuttavat vaikeuksia silkkipainossa, ja liian suuret merkit ovat p\u00e4\u00e4llekk\u00e4isi\u00e4 ja niit\u00e4 on vaikea erottaa toisistaan.<\/li>\n<\/ol>\n\n\n\n

        Nelj\u00e4s. Yksipuolisen tyynyn aukon asettaminen<\/h2>\n\n\n\n
          \n
        1. Yksipuolisia tyynyj\u00e4 ei yleens\u00e4 porata. Jos poraus on merkitt\u00e4v\u00e4, rei\u00e4n halkaisija on suunniteltava nollaksi. Jos numeerinen arvo suunnitellaan, porausdataa luotaessa rei\u00e4n koordinaatit n\u00e4kyv\u00e4t t\u00e4ss\u00e4 kohdassa, ja syntyy ongelma.<\/li>\n\n\n\n
        2. Yksipuoliset tyynyt on merkitt\u00e4v\u00e4 erityisesti, jos ne porataan.<\/li>\n<\/ol>\n\n\n\n

          Viisi. K\u00e4yt\u00e4 t\u00e4ytelohkoja tyynyjen piirt\u00e4miseen<\/h2>\n\n\n\n

          Piirustustyynyjen piirt\u00e4minen t\u00e4ytepaloilla voi l\u00e4p\u00e4ist\u00e4 DRC-tarkastuksen piiri\u00e4 suunniteltaessa, mutta se ei ole hyv\u00e4 k\u00e4sittely\u00e4 varten. Siksi samanlaiset tyynyt eiv\u00e4t voi suoraan tuottaa juotosmaskidataa. Kun juotosvastusta levitet\u00e4\u00e4n, t\u00e4yteaineblokin alue peittyy juotosvastuksen alle, mik\u00e4 johtaa siihen, ett\u00e4 laitteen juottaminen on vaikeaa.<\/p>\n\n\n\n

          PHILIFAST<\/a> on ammattitaitoinen PCB-insin\u00f6\u00f6ritiimi, joka tarjoaa hy\u00f6dyllisen teknisen ehdotuksen suunnittelun optimoimiseksi.<\/p>\n\n\n\n

          <\/p>","protected":false},"excerpt":{"rendered":"

          PCB design is based on the circuit schematic diagram to realize the functions required by the circuit designer. PCB design 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design is based on the circuit schematic diagram to realize the functions required by the circuit designer. PCB design […]","_links":{"self":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/posts\/4212","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/comments?post=4212"}],"version-history":[{"count":2,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/posts\/4212\/revisions"}],"predecessor-version":[{"id":4216,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/posts\/4212\/revisions\/4216"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/media\/4215"}],"wp:attachment":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/media?parent=4212"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/categories?post=4212"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/tags?post=4212"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}