Regular chokes can certainly be used in parallel so that multiple smaller chokes with a lower current rating can be used. But does this also work for common mode chokes?
I would assume that differential currents are also affected by the common mode choke if the current goes in choke 1 and goes out choke 2. Can you assume that for regular differential output currents \$i_\mathrm{in1}\$ is always the same as \$i_\mathrm{gnd1}\$?
My intuition is that the common mode inductance will ensure that \$i_\mathrm{in1} = i_\mathrm{gnd1}\$ for differential output currents, at least at higher frequencies. Close to DC I'm not so sure anymore. For paralleling regular inductors I would not assume exactly equal current sharing.
Worst case I can imagine would be a DC differential output current leading to \$i_\mathrm{in1} \neq i_\mathrm{gnd1}\$ and saturating the choke, rendering it useless for actual common mode current. Is this a realistic scenario?
If you find any application note etc. regarding parallel CM-chokes, let me know. I couldn't find anything. But maybe this is a blatantly obvious topic.
simulate this circuit – Schematic created using CircuitLab
Regular chokes can certainly be used in parallel so that multiple smaller chokes with a lower current rating can be used.
- this is a generally flawed idea so, maybe you have a particular use-case where they can? \$\endgroup\$