High DC bias Common mode Choke

[yopat]

Find this site out of desparation, I have problem finding suitable core material for my common mode choke. The problem is the huge DC bias, 11A, 31A and 38A. I tried amorphous core but the resulting choke is gigantic, and still the inductance gone to nothing. The required inductance is in the mH range. What kind of core should I use?

Thanks so much in advance
P.S. Have I posted on the wrong forum?

 

[mariovittorio]

Hello, I think you have a problem because you forget that in a common mode choke the currents in the two windings are opposite and hence you don't have to worry about saturation of the core. Choose a large toroidal core and worry about the wire AWG according to the DC currents you are dealing with. Depending on the Al of the core you can calculate the number of turns (the same for each winding. Let me know if you need more help than this. Best regards, pazzini.m@microsigma.it

 

[jbartos]

Suggestion: Some high DC biases will not be possible to deal with over the material or magnetic circuit. Some DC blocking or DC mitigation will be needed.

 

[electricuwe]

To avoid useless duplicate discussions see:

thread238-51522