Metòd la kalkil nan Pkb lajè liy ak aktyèl se jan sa a:

Premye kalkile zòn nan kwa-seksyonèl nan Track. Epesè FOIL kwiv la nan pifò PCBS se 35um (si ou pa sèten, ou ka mande manifakti PCB la). Zòn kwa-seksyonèl la miltipliye pa lajè liy lan. There is an empirical value for current density ranging from 15 to 25 amperes per square millimeter.

Peze zòn nan kwa-seksyonèl yo ka resevwa kapasite a atravè-koule. I= KT0.44a0.75K is the correction coefficient. Generally, 0.024 is taken in the inner layer of copper clad wire, and 0.048t is taken in the outer layer as the maximum temperature rise, and the unit is Celsius (the melting point of copper is 1060℃). A is the cross-sectional area of copper clad, and the unit is square MIL(not mm mm, I is the maximum allowable current, the unit of amperes (AMP) is generally 10mil=0.010inch=0.254, which can be 1A, 250MIL=6.35mm, and is 8.3A data. The calculation of PCB current-carrying capacity has been lacking of authoritative technical methods and formulas. Experienced CAD engineers rely on personal experience to make more accurate judgments. Men, CAD inisyasyon, pa ka di yo satisfè yon pwoblèm difisil.

Kapasite aktyèl la nan pkb depann sou faktè sa yo: lajè liy, epesè liy (epesè FOIL kwiv), monte tanperati admisib. As we all know, the wider the PCB line, the greater the current-carrying capacity. Here, please tell me: assuming that 10MIL can withstand 1A under the same conditions, how much current can 50MIL withstand, is it 5A? Repons lan, nan kou, se pa gen okenn. The line width is in the unit of Inch (Inch Inch =25.4 millimetres) 1 oz. Copper = 35 Micron epè, 2 oz. = 70 Micron epè, 1 oz = 0.035mm 1mil. = 10-3inch. Trace Capacityper MIL STD 275

The pressure drop caused by the resistance of the wire length must also be considered in the experiment. The tin on process welds is only used to increase the current capacity, but it is difficult to control the volume of tin. 1 OZ kwiv, 1mm lajè, jeneralman 1-3 Yon galvanomètr, tou depann de longè liy ou, kondisyon yo gout presyon.

Valè maksimòm aktyèl la ta dwe valè maksimòm admisib la anba limit ogmantasyon tanperati a, ak valè fuse a se valè kote ogmantasyon tanperati a rive nan pwen k ap fonn kwiv la. Eg. 50mil 1oz tanperati monte 1060 degre (sa vle di kwiv pwen k ap fonn), aktyèl la se 22.8A.