I am trying to simulate Push-pull converter in LT spice. Vin=50 Vo= 17.5V, and input power of P=38.28W with switching frequency of f 150kHz, L= 268.19uH and C = 41.42nF and R load=8ohms. I am not able to get the desired output across the load resistance. Is it because of Flux walking at primary of transformer or due to some other reason? Should I need to design a simple RC snubber for the two Mosfets and what is the procedure for designing snubber for push-pull converter? The main problem is that the PWM pulses applied to primary of the transformer is not a perfect alternating square wave and pulses are reaching a peak value of 27KV which is not at all desirable. Any suggestions to rectify this problem.

 

This may have some suggestions.

You should use actual device models for the semiconductors, not the generic, as those can have some odd characteristics.

 

thanks @crutschow.

Any guidelines or criteria to choose semiconductor switch and diode for the specific application would help, as there are many manufacturers with different operating ranges.