I am simulating the pulse transformer in LT spice to see how core gets reset using the diode D1.
Diode D1 current (Id1 : red colour) is in pulsating form as shown in the image below.
But the magnetizing current (Il1 : blue colour) keeps on adding by each pulse and never returns to zero during off time of the pulse.
Transformer is not saturating since I can see clearly the input pulse on the secondary side without any distortion.
What could be the reason that magnetizing current is building though I have done reset arrangement?