Why is it not popular using common mode chokes in differential mode configuration for differential mode noise filtering?
Mostly when using fly-wire type chokes with filters, where the chokes are simply kept inside the enclosure with its wires connected to X and Y capacitors placed on the PCB (due to its size which makes it costly to be placed on board), can't this kind of arrangement help avoid placing one common mode choke and two separate single winding chokes and go with one common mode choke for common mode filtering and another common mode choke connected in differential mode configuration as shown in attached schematics?
Could saturation be a problem for low current design? If yes, I dont understand why not if two separate chokes are used. I am assuming the core is properly sized to not go to saturation during normal operation.