alisarhangpour
New Member
I'm going to design a 25W Flyback SMPS, and I had a look at Abraham Pressman's book: "Switching Power Supply Design 2nd. Ed.".
The problem is: according to the relations given in the book, when I calculate the RMS current of primary and secondary windings of the transformer, I find out that Irms(pri.)*VDC(nominal) or Irms(sec.)*VDC(out) is twice the intended power.
And when I checked the example given in the book, I found the same: Power is twice the intended figure. Am I making any mistakes simply multiplying Irms by VDC? or is there anything I'm not taking into account? look at example 4.3.2.7 in attachment.
The problem is: according to the relations given in the book, when I calculate the RMS current of primary and secondary windings of the transformer, I find out that Irms(pri.)*VDC(nominal) or Irms(sec.)*VDC(out) is twice the intended power.
And when I checked the example given in the book, I found the same: Power is twice the intended figure. Am I making any mistakes simply multiplying Irms by VDC? or is there anything I'm not taking into account? look at example 4.3.2.7 in attachment.