Voltage oscillation in different transformer modeling approach

[Vanease]

@mhx

When the simulator makes a small error in the on-time of the
output diodes, the secondary leakage inductor currents store some energy
that can go nowhere when the output diodes subsequently turn off again.

so you basically confirm trap-ringing tends to happen at ideal diode and inductor’s current reaching zero? any other situations where it can happen?

nice to know in deep details why small time step and some dissipation help.

Marcel, thanks!