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
( g( {/ h& l4 i& a6 `6 v& H# S, Bbe brought with maximum 4KW, 220V can be maximum 2KW.
& ~; @, ^+ I2 W- [& H/ ?5 q2 square? Three square meters can be pushed like that
3 g# M: p; Y. R9 |6 U; V, R+ mPCB line width and current relationship
* e4 f# u- |- o* p& G& a3 v! ]' _$ aI. calculation method is as follows:
) K6 V9 ]( T9 [3 F" zFirst, the section area of Track is calculated. The copper foil
) d- f* z7 O0 W  \thickness of most PCB is 35um (the PCB manufacturer can be asked if it
is not certain). The width of the PCB is the
cross-sectional area. There is an experience value of current
% `3 _# P1 D' `( Qdensity for 15 ~ 25 amperes per square millimeter. We can just call it
1 H; R# @4 p! S2 S/ }. N- N9 cthe area where we get the volume.
I = 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)
T to the maximum temperature rise, the unit for degrees Celsius
(copper melting point is 1060 ?)
A to cover the area of copper, the unit is square MIL (not mm mm,
the attention is square MIL.)
I is the maximum allowable current, the unit is ampere (amp).
+ d- H- w4 A* z, e5 [. YThe average 10mil = 0.010 inch = 0.254 May be 1A, 250MIL = 6.35mm,
4 V9 x. Y" P$ h$ A# q) f* `1 Fwhich is 8.3 A  

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PCB线宽与电流

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学习一下，谢谢。