Hi everyone, I have a few doubts about transformer design. 1.How do I calculate the AL value(inductance factor) of a transformer core .[ ferrite in my case ].? The Al value is given in the data sheet is for a set of UI ungapped core. What if I have to stack 2-3 cores together? How will the AL value differ? 2. Number of turns calculation: step up voltage from 300 V (square wave ) to 5.7 KV (sinuous ) rms . So my ratio N1:N2 is 1:19 N1= (Vin× T/2)/ (B*Amin) Vin=300V. I max = 4 A f=30 KHz . T = 3.3*10^-5 B = 0.5 T (Given in data sheet) Amin= 1800 mm^2 So the value computed from this formula is my number of primary windings or the minimun number of primary windings? How could I calculate the number of primary windings ? I have also attached the datasheet of the ferrite core.. Thank you ..