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# Pulse Transformer - Transformer Design Confusion

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#### ElecDesigner

##### Member level 5
Hi,

I am designing a Pulse Transformer for an isolated Thyristor Gate Drive solution and an confused by a detail in calculating the required turns.
I am using the information from the third page here.....

It states that...
N = ET / B.Ac.10^-8

What I dont understand is that I am used to the equation for a square-wave in a transformer being
Bmax = Vin(nom) x 10^8 / 4 x f x N(prim) x Ac

I am assuming that T (first equation) is the pulse time, so actually f (second equation) = 2T.

This would presumably rearrange to
N = Vin x 2T / 4 x f x N(prim) x Ac

and...

N = Vin x T / 2 x f x N(prim) x Ac

My confusion is why I have a 2 here. Is there something I am missing.

dB/dt = V / ( N.Ae ) all in SI units

so from -100mT to +100mT, in 5uS ( 100kHz square wave ) = V / ( N. Ae )

where V = applied square wave volts, N = turns, Ae = core cross sect area
--- Updated ---

Ae in m^2, B in Tesla,

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