Monday, April 30, 2012
Active clamp forward
I'm stuck as I can't seem to get an expression for jm1 for the active clamp forward.
It may or may not be necessary, as Cclamp adjusts to reset the XFR but is there a way to determine this?
Also it seems that once the turns ratio is fixed and the device parasitics are fixed (by virtue of selecting a particular mosfet) all I can do is play with Lm to achieve ZVS and select this in a manner that minimizes the magnetization current.
Anybody else have a different approach?
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Hi SM,
I used max current stress = Vds = Vg + Vb to get Vb, then use that to get Mb, which gives you D. You can then use this to get n by using V/(nVg) = D.
Because you know Cds, you can use M*pi/F = (1 + J) to get your Lm value. The tricky part is using the right Vg in the right place.
I got answers that seem reasonable, so hopefully I did it right.
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