cupoftea
Advanced Member level 6
Hi,
We are doing a offline flyback at 100kHz.
irms(pri) is 1A
Primary is 32 strands of 0.315mm EC Wire.
Skin depth is 0.206mm
According to this.....
(Post #27 of this....)
_____--_________________________vvv___________
First calculate x from:
x=2*pi*r*sqrt(2*f/172400)
where f is frequency in Hertz and r is wire radius in millimeters,
then for 0<=x<=4 use:
K=(3.2*x^4+576)/(x^4+576)
and for 4<x<=10 use:
K=(204*x+151)/576
and then we have:
Rac=Rdc*K
r = radius in mm
f = freq
____---__________________________^^^-----------
Rac = 1.01 x Rdc
Surely this cant be right? Rac almost equals Rdc
We are doing a offline flyback at 100kHz.
irms(pri) is 1A
Primary is 32 strands of 0.315mm EC Wire.
Skin depth is 0.206mm
According to this.....
(Post #27 of this....)
Totally unsuitable wire used for SMPS transformer (skin effect)?
So another way to look at is "effective impedance" from the ratio of utilization of AC/DC currents from geometry of skin effects, but not a change in sacred terms like Resistance or Conductance. That would probably keep "The Electrican" happy. It appears "The Electrician" isn;t your average...
www.electro-tech-online.com
First calculate x from:
x=2*pi*r*sqrt(2*f/172400)
where f is frequency in Hertz and r is wire radius in millimeters,
then for 0<=x<=4 use:
K=(3.2*x^4+576)/(x^4+576)
and for 4<x<=10 use:
K=(204*x+151)/576
and then we have:
Rac=Rdc*K
r = radius in mm
f = freq
____---__________________________^^^-----------
Rac = 1.01 x Rdc
Surely this cant be right? Rac almost equals Rdc