Transformer X model vs. K parameter - not equal?

QSPICE
1

Hi guys,

I am simulating a design using a transformer. I have tried the mutual coupling parameter K and also the transformer model X.

When testing them on a simple sinewave input they both behave the same way, but when I instert them into my circuit they significantly alter the behaviour of signals.

Here is a screenshot with the K parameter:

image
image2554×1391 218 KB

And here is a screenshot with the X model:
(in the following post since I cant post two screenshots…)

Any suggestions on what is causing the difference?

Thanks!

Samo

2

And here is a screenshot with the K parameter:

image
image2553×1370 245 KB

3

Why you not defined transformer parameters as described in Help file?

4

Well they are, aren’t they?
The only mandatory parameter is TURNS which i have specified. All other are additional parameters. Did i overlook something?