J
Julius Junghans
- Jan 1, 1970
- 0
hello netlanders,
Im in the process to calculate a forward converter transformer, im hanging on the reset winding... in the smps book from A. Pressman theres this formula:
Lmg = Al * (n/1000)^2 = 2900nH * (4/1000)^2 = 46,6mH
Al = 2900nH Epcos Datasheet E42/21/15 - N27 core.
n = secondary turns
Im not sure if nH for Al is right here, if its right the next step is to calculate the rms current through that winding:
Img = 0,365 * ((Vdc(min) * ton(max)) / Lmg) = ((0,365 * 248V * 13,3us) / 46,6mH) = 71mA
Img = current of the reset winding
Vdc(min) = min rectified voltage
ton(max) = max ontime, f = 30kHZ, T = 33,3us
is this correct?
Im in the process to calculate a forward converter transformer, im hanging on the reset winding... in the smps book from A. Pressman theres this formula:
Lmg = Al * (n/1000)^2 = 2900nH * (4/1000)^2 = 46,6mH
Al = 2900nH Epcos Datasheet E42/21/15 - N27 core.
n = secondary turns
Im not sure if nH for Al is right here, if its right the next step is to calculate the rms current through that winding:
Img = 0,365 * ((Vdc(min) * ton(max)) / Lmg) = ((0,365 * 248V * 13,3us) / 46,6mH) = 71mA
Img = current of the reset winding
Vdc(min) = min rectified voltage
ton(max) = max ontime, f = 30kHZ, T = 33,3us
is this correct?