标题: PCB线宽与电流（PCB line width and current） [打印本页] 作者: ddddaaaaa 时间: 2020-2-17 15:30 标题: PCB线宽与电流（PCB line width and current） PCB 线宽与电流(PCB line width and current)1 P7 L4 s$ e! z% J j* l% P
The withstand current of 1 square copper wire is 5 -- 8A, 380V can 9 l; h1 u) s& ^be brought with maximum 4KW, 220V can be maximum 2KW. 0 W& b$ g0 _4 d$ S' z. m4 w" Q2 square? Three square meters can be pushed like that + y# C) G! t, tPCB line width and current relationship ( i0 {! C0 U3 y( }I. calculation method is as follows: : s/ w5 g3 C* HFirst, the section area of Track is calculated. The copper foil0 b# W$ h, o& C8 P/ d
thickness of most PCB is 35um (the PCB manufacturer can be asked if it & {8 b- J6 k5 Pis not certain). The width of the PCB is the . f/ A/ h7 L# ecross-sectional area. There is an experience value of current ) v. X; k- @* D$ q5 Ddensity for 15 ~ 25 amperes per square millimeter. We can just call it $ W6 n5 E/ d% j! d0 c( `, j- nthe area where we get the volume.$ n$ A) n6 r( t5 u+ L
I = KT0.44 A0.75 (K is the correction factor, which is 0.024 in the! K/ [6 L2 h( a; u
inner layer of the copper line, and 0.048 in the outer layer)- Y& G$ Y: L" | P! t
T to the maximum temperature rise, the unit for degrees Celsius4 ?2 B: B" _# N& {% H/ a; {
(copper melting point is 1060 ?) 1 _& k8 i6 b+ ^- |/ gA to cover the area of copper, the unit is square MIL (not mm mm,/ ]* x0 ]" [/ D! J0 \5 A/ ^
the attention is square MIL.): o% I. \2 z& b4 \6 A B
I is the maximum allowable current, the unit is ampere (amp).$ D6 ^. i& O0 t& r" p
The average 10mil = 0.010 inch = 0.254 May be 1A, 250MIL = 6.35mm, # \! C/ t7 P8 T7 O3 _7 Hwhich is 8.3 A ' g# ?7 p6 T4 ?4 c