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Push-Pull Converters snubber calculating

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Finkl

Finkl

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Hi guys
I need to calculate RCD snubber for push pull converter
That work on 1Mhz switching frequency.
Input voltage to the transformer is 24V
I understand that I need to calculate the
leakage inductance and the parasitic capacitance
how do I do that? And finely calculate the RCD snubber?

Thanks
 

Dear Finkl
Hi
There are many simpler ways to calculate snubber networks available , would you like that i explain some of them for you ?
Best Wishes
Goldsmith
 

You can measure the primary leakage inductances on your push pull transformer, you can assume the dominant cap will be the mosfet, use a snubber cap 5-10x this value.
calculate R from 0.5 x SQRT(L/C), if you have very high leakage and/or reflected energy from the secondary there are other ways to work out the RC based on Ipk at mosfet turn off and max power you can tolerate in the snubber R (e.g. 3W may be practical) this allows a higher value of C and more effective snubbing. Regards, Anna.
 

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