Ringing is the issue of transformer only (other words not an issue its happening all transformer due to low coupling or leakage inductance)
To reduce these ringing you should do interleaved winding (Fro example half primary flowed by secondary then reaming half primary )
The ringing is not good for health. Use a diode capacitor and see that the ringing is not more than 20% (overshoot) - also ensure that you turn-on hard - is the gate drive sufficient?
your turns ratio is 38.4:1
Can you give more information about the type of MOSFET, diodes and output power? Maybe you can post your schematic as well.
I assume the gate resistor burn't out as the fet had died? from in-sufficient heatsinking?
A big snubber across your o/p diode will help a lot too...!
how much power are you trying to process? more than 200W? if so you will need large snubbers.
from the scope shots you are well into continuous operation with a high duty cycle - unfortunately this will always give problems with spikes on the o/p diodes and lots of RFI...! and heat in the fet...
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A big snubber across your o/p diode will help a lot too...!
I am sticking on previous post about the ringing . But I surprise when I see your transformer design. You are using unmatched transformer for your application.
See the formula ,
L pri = Vin*Dmax/Ipk*F
70*0.5/10.37*100000= 33.7uH
Ipk =Iin *5.5
Air gap required for fly back topologies to store energy when the switch closed, Use below equation to find air gap
Air gap in meter =.4*3.14*Lpri*Ipk*Ipk/Area of cross section of core*0.4*0.4
For 120W power ETD 39 will do better
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