Center tapped transformer equations

Just in case the transformer is with iron core, forget the frequency domain. Fourier transform assumes linearity, which an iron transformer is not.

In case the transformer is air core, some equations may be sufficient.

Rene

Those are very simplified transformer equations!

In the real world, transformers have distributed resistance and capacitance and quite a bit of non-linearity at high fluxes, all of which make simple models work not very well at high or low frequencies, or high amplitudes.

Here's a web page with more advanced models you may find helpful:

Why do you use that Tiny URL crap? Just post the real URL so someone can still find the web page in a couple months: Quite often I will click on one of those links to find that it has expired, or even worse it has been reused.

Because quite often the long url is full of funny characters that most web browsers cant figure out are not delimiters.

even worse it has been reused.

Please show us ONE example of this.

As far as I know, and tinyurl claims, they never expire or reuse the tiny URLS. For them to do so would be pointless, counterproductive, and just plain dumb.

Maybe you're thinking of something else...

-- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85.

Michael A. Terrell Central Florida

Reply

More likely the browser software used to post the long URL is faulty and breaks it into several parts. I simply add < and > around any length link to tell my newsreader not to break the link. If there is a problem with the long link the redirect site still couldn't send you there. Think about it. Also, you are posting through Goggle which is a second or third rate method to access usenet.

or even worse it has been reused.

I had archived several treads with those short URLs and they were all bad or had been reused so i deleted them. Why would I keep them if they didn't work?

No, it was one of these linking services that corrupted a lot of interesting threads I had archived.

On the other hand, why would you care if someone looks at the Google archives in a couple years to find the link is bad? If they at least knew the home page for the site they might luck out and find the information anyway.

Others have noted that transformers are nonlinear devices. Setting that aside, perhaps your question is how to deal with a centertapped xfmr or one with more than two windings.

For multiple windings you must set up the mesh equations with terms for coupling from each winding to every other winding, as:

V1 = s(I1) L11 + s(I2)L12 + s(I3) L13 + ... V2 = s(I1) L21 + s(I2) L22 + s(I3) L23 + .... ...... Vn = s(I1)Ln1 + s(I2)Ln2 + s(I3) Ln3 + ....+s(In) Lnn

This is further oversimple (beyond ignorinig nonlinearities) because it ignores winding resistances.