Electronics > Projects, Designs, and Technical Stuff

Effective dimensions of binocular ferrite core

(1/1)

Telegraph:
I was trying to do calculations on a ferrite binocular core.  I found formulas to calculate the permeability that require the effective area and magnetic path length.  For a regular toroid, or bead, that appears to be straight forward.  What about a binocular (mulit-aperture core)?  I found documentation for more complex arrangements, such as, E-cores but nothing on the binocular format.

richard.cs:
Treat is as two independent tube cores, each like a long bead.

igor78:
This topic comes first in websearch. For future readers:

Page 2 here
https://www.tdk-electronics.tdk.com/inf/80/db/fer/double_aperture_cores.pdf

Notice the dimension units there mm^-1

Also see https://owenduffy.net/blog/?p=14712 "Geometry factors for some common Fair-rite binocular ferrite cores"

CoreBN designationΣA/l (m)2843000202BNxx-2020.002882843000302BNxx-3020.002112843001502BNxx-15020.001392843002402BNxx-24020.0015428430104020.00308

jonpaul:
for,a shield EMI bead, see mfg specs,
for use,as balun, the exact spec is seldom important

We just wind and test on a high frequency RLC or impedance analyzer
j

jonpaul:
beside TDK try old Fair-Rite, EPCOS, Philips data.

j

Navigation

[0] Message Index