Txoj kev suav ntawm PCB kab dav thiab tam sim no yog raws li hauv qab no:

Ua ntej xam thaj tsam hla ntu ntawm Track. Cov ntawv ci tooj liab tuab ntawm feem ntau PCBS yog 35um (yog tias koj tsis paub meej, koj tuaj yeem nug THE PCB chaw tsim khoom). Thaj tsam ntawm cheeb tsam yog muab faib ua kab dav. Muaj tus nqi kwv yees rau qhov ceev tam sim no suav txij li 15 txog 25 amperes ib square millimeter.

Ntsuas thaj tsam hla ntu kom tau txais cov peev txheej dhau los. Kuv = KT0.44a0.75K yog qhov kho qhov coefficient. Feem ntau, 0.024 tau muab tso rau hauv txheej txheej tooj liab, thiab 0.048t raug muab coj los rau txheej txheej sab nraud raws li qhov kub siab tshaj plaws, thiab chav tsev yog Celsius (lub ntsiab lus yaj ntawm tooj liab yog 1060 ℃). A yog thaj tsam hla ntawm tooj liab clad, thiab chav tsev yog square MIL (tsis yog mm mm, Kuv yog qhov tso cai tau ntau tshaj tam sim no, chav tsev amperes (AMP) feem ntau yog 10mil = 0.010inch = 0.254, uas tuaj yeem yog 1A, 250MIL = 6.35mm, thiab yog 8.3A cov ntaub ntawv. Kev suav ntawm PCB lub peev xwm nqa tau tam sim no tsis muaj kev tso cai cov txheej txheem thiab cov qauv. Kev paub txog CAD cov kws tsim txuj ci vam khom tus kheej kev paub txhawm rau txiav txim kom raug dua. Tab sis rau CAD novice, tsis tuaj yeem hais kom ntsib teeb meem nyuaj.

Lub peev xwm nqa tam sim no ntawm PCB nyob ntawm cov xwm txheej hauv qab no: kab dav, kab tuab (tooj liab ntawv tuab), tso cai kub nce. Raws li peb txhua tus paub, cov kab PCB dav dua, qhov muaj peev xwm nqa tau ntau dua tam sim no. Ntawm no, thov qhia rau kuv: piv txwv tias 10MIL tuaj yeem tiv taus 1A hauv tib qhov xwm txheej, tam sim no muaj peev xwm 50MIL tuaj yeem tiv taus, nws puas yog 5A? Cov lus teb, tau kawg, tsis yog. Txoj kab dav yog nyob hauv chav Inch (Inch Inch = 25.4 millimeters) 1 oz. Tooj liab = 35 micron tuab, 2 oz. = 70 micron tuab, 1 oz = 0.035mm 1mil. = 10-3inch. Txheeb Ze Peev Xwm MIL STD 275

Lub siab poob los ntawm kev tiv thaiv ntawm cov xov hlau ntev yuav tsum raug txiav txim siab hauv qhov kev sim. Cov tin ntawm cov txheej txheem welds tsuas yog siv los ua kom muaj peev xwm tam sim no, tab sis nws nyuaj rau tswj lub ntim ntawm tin. 1 OZ tooj liab, 1mm dav, feem ntau yog 1-3 A galvanometer, nyob ntawm koj txoj kab ntev, qhov xav tau poob qis.

Tus nqi siab tshaj tam sim no yuav tsum yog tus nqi tso cai siab tshaj plaws hauv qhov ntsuas kub nce, thiab tus fuse tus nqi yog tus nqi uas qhov kub nce mus txog qhov kub yaj ntawm tooj liab. Piv txwv 50mil 1oz kub nce 1060 degrees (piv txwv li tooj liab melting point), tam sim no yog 22.8A.