This pic shows a literal representation of the unicore concept where the primary/secondary and the 2 chokes are on the same core.

If both are bifilar, then primary/secondary are wrapped together and the 2 chokes are wrapped together.



When + pulses into primary at the top into the light blue wire, the primary coil will have a NORTH field at the top...you can see how the wire comes off the core and are wound that there will be north at top so SOUTH at bottom of primary in this situation.

If secondary is wound together, the BOTTOM wire will need to go through diode to POSITIVE CHARGING CHOKE, which will give a NORTH field at the BOTTOM of the pos charging choke...like in the square coil.

The right diagram with the pole core is just a visualization easier of what is really happening with magnetic field in core.

Anyway, the charging pos choke will have south at top. The negative choke will have the identical field as the pos choke.

A BENEFIT of this arrangement and the only one that makes common sense is that when the primary is charged with north at top that follows around to the south part of charging chokes and up through the chokes and back to south on primary. so in the SQUARE coil diagram, you see that the magnetic field goes north in the CLOCKWISE DIRECTION.

Not only does the chokes charge from the potential going into the chokes from the secondary, BUT, they also get a kick from the magnetic field of the CORE being charged from primary will will give a BOOST to what is happening in the chokes. THIS AMPLIFIES THE CHOKES.

THIS IS ALL HAPPENING DURING THE ON PULSE.

When pulse turns OFF, charged chokes collapse in SAME DIRECTION because of blocking diode, which is the same thing as opening a switch and disconnecting the chokes there. Therefore, they will find ground in the FORWARD direction to "negative"on secondary.

During OFF pulse, primary also collapses and secondary directs that into the chokes also in the forward direction.

For each time you pay for ONE pulse into the system in this arrangement, you get TWO pulses to the WFC capacitor.