PCB线宽与电流（PCB line width and current）

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PCB 线宽与电流(PCB line width and current)
The withstand current of 1 square copper wire is 5 -- 8A, 380V can
be brought with maximum 4KW, 220V can be maximum 2KW.
2 square? Three square meters can be pushed like that
# K5 P) u0 \5 `  UPCB line width and current relationship
I. calculation method is as follows:
First, the section area of Track is calculated. The copper foil
thickness of most PCB is 35um (the PCB manufacturer can be asked if it
3 A3 L" G. B4 y+ U/ B0 y# o0 @is not certain). The width of the PCB is the
cross-sectional area. There is an experience value of current
; i$ d3 g2 i  _. ndensity for 15 ~ 25 amperes per square millimeter. We can just call it
the area where we get the volume.
8 Z9 p/ [$ C/ i( t3 z7 \6 B) ZI = KT0.44 A0.75 (K is the correction factor, which is 0.024 in the
inner layer of the copper line, and 0.048 in the outer layer)
4 m7 Y" s: E% ]" a- UT to the maximum temperature rise, the unit for degrees Celsius
(copper melting point is 1060 ?)
% h. b8 Z5 h- iA to cover the area of copper, the unit is square MIL (not mm mm,
, x+ P9 S# R* k* Ithe attention is square MIL.)
# u( D8 |/ e7 S, Q4 z, d3 rI is the maximum allowable current, the unit is ampere (amp).
The average 10mil = 0.010 inch = 0.254 May be 1A, 250MIL = 6.35mm,
which is 8.3 A  
) V9 p2 G& X4 u- \. T$ \! _


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PCB线宽与电流

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学习一下，谢谢。
2 _8 a/ l5 L) H7 b