Hi,
I was curious about how fast the winding induced flux will propagate through a transformer core (ie a ferrite core) assuming a single primary winding on a toroid? Would it be possible to make a resonant transformer using core geometry (ie replacing the toroid with a shape that has a sine wave on the toroid). If the switching frequency is high enough, maybe it is possible to utilize the finite flux propagation speed (ie. by using resonant flux switching to give different simulated urns ratios etc)
cheers, Jamie