Kupisa kunogadzirwa nemichina yemagetsi panguva yekushanda kunokonzera kupisa kwemukati kwemidziyo kukwira nokukurumidza. Kana kupisa kusina kupera munguva, midziyo icharamba ichipisa, chigadziro chichakundikana nekuda kwekupisa, uye kuvimbika kwezvigadzirwa zvemagetsi zvichaderera. Nokudaro, zvakakosha zvikuru kubvisa kupisa kubhodhi redunhu.
Factor Analysis yeTemperature Rise yePrinted Circuit Board
Chikonzero chakananga chekukwira kwekushisa kwebhodhi rakadhindwa nekuda kwekuvapo kwemagetsi emagetsi emagetsi, uye zvigadzirwa zvemagetsi zvine simba rekushandisa kune zvakasiyana-siyana, uye kupisa kwekushisa kunoshanduka nekushandiswa kwesimba.
Zviitiko zviviri zvekukwira kwekushisa mumabhodhi akadhindwa:
(1) Tembiricha yekukwira kwenzvimbo kana kukwira kwenzvimbo hombe;
(2) Kukwira kwekushisa kwenguva pfupi kana kukwira kwekushisa kwenguva refu.
Paunenge uchiongorora PCB yekupisa simba mashandisirwo emagetsi, kazhinji kubva pane zvinotevera zvinhu.
Kushandiswa kwemagetsi emagetsi
(1) Ongorora mashandisirwo emagetsi pachikamu chimwe chete;
(2) Ongorora kugoverwa kwesimba rekushandisa paPCB redunhu bhodhi.
2. Chimiro chebhodhi rakadhindwa
(1) Ukuru hwebhodhi rakadhindwa;
(2) Zvinhu zvebhodhi rakadhindwa.
3. Kuisa nzira yebhodhi rakadhindwa
(1) Kuisa nzira (senge yakatwasuka yekuisa uye yakachinjika kuisirwa);
(2) Chisimbiso mamiriro uye chinhambwe kubva kune casing.
4. Thermal mwaranzi
(1) Emissivity yenzvimbo yakadhindwa yebhodhi;
(2) Musiyano wetembiricha pakati pebhodhi rakadhindwa nenzvimbo iri padyo uye tembiricha yavo yakakwana;
5. Kuitisa kupisa
(1) Isai reyeta;
(2) Kuitisa zvimwe zvekuisa zvimiro zvikamu.
6. Thermal convection
(1) Kutenderera kwechisikigo;
(2) Kumanikidzwa kutonhora convection.
Kuongororwa kwezvinhu zviri pamusoro kubva kuPCB inzira inoshanda yekugadzirisa kukwira kwekushisa kwebhodhi rakadhindwa. Izvi zvinhu zvinowanzoenderana uye zvinoenderana nechigadzirwa uye system. Zvizhinji zvinhu zvinofanirwa kuongororwa zvichienderana nemamiriro chaiwo, chete kune chaiyo chaiyo mamiriro. Mumamiriro ezvinhu aya chete ndipo panogona kusimudzwa tembiricha uye kushandiswa kwemagetsi kuverengerwa kana kufungidzirwa nemazvo.
Circuit board cooling method
1. Chigadzirwa chepamusoro chekugadzira kupisa pamwe nekupisa sink uye kupisa conduction ndiro
Kana michina mishoma muPCB inoburitsa huwandu hwakawanda hwekupisa (pasi pe3), singi yekupisa kana pombi yekupisa inogona kuwedzerwa kumudziyo wekugadzira kupisa. Kana tembiricha isingadzikiswe, singi yekupisa ine feni inogona kushandiswa kuwedzera kupisa kwekupisa. Kana pane zvimwe zvinopisa zvinopisa (zvinopfuura 3), chifukidziro chikuru chekupisa kupisa (bhodhi) chinogona kushandiswa. Iyo yakakosha radiator yakagadziridzwa zvinoenderana nenzvimbo uye kureba kwemudziyo wekudziya paPCB board kana muhombe flat radiator Cheka kureba kwezvinhu zvakasiyana. Sunga chivharo chekupisa kupisa kune chikamu chepamusoro, uye bata chikamu chimwe nechimwe kuti chibvise kupisa. Zvisinei, nekuda kwekusagadzikana kwehurombo hwezvikamu panguva yegungano uye welding, kupisa kwekushisa hakuna kunaka. Kazhinji iyo yakapfava yekupisa chikamu shanduko yekupisa pad inowedzerwa pane chikamu chepamusoro kuti ivandudze kupisa kupisa mhedzisiro.
2. Kupisa kupisa kuburikidza nePCB board pachayo
Parizvino, mahwendefa ePCB anoshandiswa zvakanyanya ndeyemhangura-yakapfeka / epoxy girazi jira substrates kana phenolic resin girazi jira substrates, uye shoma shoma-yakavakirwa-yakavakirwa mhangura-clad ndiro inoshandiswa. Kunyangwe aya ma substrates aine yakanakisa mashandiro emagetsi uye mashandiro ekugadzirisa, ane hurombo hwekupisa kupisa. Senzira yekupisa kupisa kwepamusoro-inogadzira zvinhu zvinogadzira kupisa, iyo PCB pachayo haigone kutarisirwa kuitisa kupisa kubva kune resin yePCB, asi kubvisa kupisa kubva pamusoro pechikamu kuenda kumhepo yakatenderedza. Zvisinei, sezvo zvigadzirwa zvemagetsi zvakapinda munguva yeminiaturization yezvikamu, kuiswa kwepamusoro-density, uye kuungana kwepamusoro-kupisa, hazvina kukwana kuvimba nepamusoro pezvikamu zvine nzvimbo shoma shoma kuti iparadze kupisa. Panguva imwecheteyo, nekuda kwekushandiswa kwakanyanya kwezvikamu zvepamusoro-soro zvakadai seQFP neBGA, kupisa kunokonzerwa nezvikamu kunoendeswa kubhodhi rePCB muhuwandu hwakawanda. Nokudaro, nzira yakanakisisa yekugadzirisa kupisa kwekushisa ndeyekuvandudza kupisa kwekushisa kwePCB pachayo pachedu yakananga nechokupisa. Kufambisa kana kuburitsa.
3. Gamuchira inonzwisisika routing dhizaini kuti uwane kupisa kupisa
Nemhaka yekuti kupisa kwekushisa kweresin mupepa hakuna kunaka, uye mitsara yemhangura yefoil nemakomba zvakanaka conductors ekupisa, kuvandudza kusara kwemhangura yemhangura uye kuwedzera maburi ekupisa ndiyo nzira huru yekupisa kupisa.
Kuti uongorore simba rekupisa kupisa kwePCB, zvinodikanwa kuverenga iyo yakaenzana yekupisa conductivity (mapfumbamwe eq) yezvinhu zvakaumbwa zvakaumbwa nezvinhu zvakasiyana-siyana zvine macoefficients akasiyana ekupisa-iyo insulating substrate yePCB.
4. Pamichina inoshandisa mahara convection air cooling, zviri nani kuronga masekete akabatanidzwa (kana mamwe madivayiri) vertically kana horizontally.
5. Zvishandiso pabhodhi rakadhindwa rimwechete rinofanira kurongeka maererano nechizvarwa chavo chekupisa uye kupisa kupisa zvakanyanya sezvinobvira. Zvishandiso zvine chizvarwa chidiki chekupisa kana kushomeka kwekudzivirira kupisa (senge madiki masaini transistors, madiki-akabatanidzwa maseketi, electrolytic capacitors, nezvimwewo) anoiswa muKurukova kwepamusoro kwemhepo inotonhorera (pamusuwo), zvishandiso zvine chizvarwa chikuru chekupisa kana zvakanaka kupisa kupisa (zvakadai semagetsi transistors, makuru-akabatanidzwa maseketi, nezvimwewo) anoiswa kune yakanyanya kudzika kwemhepo inotonhorera.
6. Munzira yakatarisa, michina yepamusoro-simba inofanira kuiswa pedyo sezvinobvira kumucheto webhodhi rakadhindwa kuti ipfupise nzira yekupisa kupisa; munzira yakatwasuka, iyo yakakwirira-simba zvishandiso zvinofanirwa kuiswa padyo sezvinobvira kumusoro kwebhodhi rakadhindwa kuti kuderedze tembiricha yezvishandiso izvi kana uchishanda pane zvimwe zvishandiso Impact.
7. Chishandiso chinodzivirira kupisa chinonyatsoiswa munzvimbo ine tembiricha yakaderera (yakadai sepasi pechigadzirwa). Usambofa wakaiisa zvakananga pamusoro pechigadzirwa chekugadzira kupisa. Midziyo yakawanda inokwanisa kudzedzereka pane yakachinjika ndege.
8. Kupisa kwekupisa kwebhodhi rakadhindwa mumichina inonyanya kuenderana nemhepo inoyerera, saka nzira yekuyerera kwemhepo inofanira kudzidzwa mukugadzira, uye chigadziro kana bhodhi redunhu rakadhindwa rinofanira kugadziriswa zvinonzwisisika. Kana mhepo ichiyerera, inogara ichiyerera apo kushorwa kuri kudiki, saka kana uchigadzira zvigadziri pabhodhi redunhu rakadhindwa, zvinodikanwa kuti urege kusiya nzvimbo huru yemhepo mune imwe nzvimbo. Kugadziriswa kweakawanda akadhindwa edunhu mabhodhi mumushini wese anofanirwawo kutarisisa kune rimwe dambudziko.
9. Dzivisa kusangana kwenzvimbo dzinopisa paPCB, govera simba rakaenzana paPCB zvakanyanya sezvinobvira, uye chengetedza kushanda kwekushisa kweyunifomu yePCB yepamusoro uye inowirirana. Zvinowanzo kuoma kuwana yakasimba yunifomu kugovera mukugadzira dhizaini, asi zvinodikanwa kuti udzivise nzvimbo dzine yakawandisa simba density kudzivirira nzvimbo dzinopisa dzinokanganisa kushanda kwakajairika kwedunhu rese. Kana mamiriro ezvinhu achibvumira, kuongorora kwekushisa kwemasekete akadhindwa kunodiwa. Semuyenzaniso, kudziya kwekupisa indekisi yekuongorora software modules yakawedzerwa mune imwe nyanzvi PCB dhizaini software inogona kubatsira vagadziri kukwenenzvera dhizaini yedunhu.