[SI-LIST] Re: Transformer Spice Model
- From: "Dr. Edward P. Sayre" <esayre@xxxxxxxx>
- To: beneken@xxxxxxxxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 12 Feb 2004 12:37:59 -0500
Thomas and fellow SI-List colleagues:
There is an excellent discussion of the circuit theory derivation of the
non-ideal transformer in Chapter 18, Sections 18.4 thru 18.7 in the
circuits text book "Analysis of Electric Cirucits", by Egon Brenner and
Mansour Javid, the McGraw Hill Electrical and Electronic Engineering
Series, McGraw Hill Book Company, Published in 1959. This is one of the
classic "black cover" books that McGraw Hill published over the years,
particularly during the 1950's and 1960's and documents the foundations of
modern circuit theory, fields and waves, complex variables, LaPlace
Transforms and other pertinent "analog" electrical engineering subject
matter. Unfortunately, I do not know for certain if the book is still in
print but I doubt it. The derivation also includes the inclusion of losses
for the linear x-former.
Thanks for addressing this topic; it made me go looking back to find the
complete story.
Sincerely,
ed sayre
======================
At 01:36 PM 1/29/2004 +0100, Thomas Beneken wrote:
>Hi John,
>
>you may find this helpful for a start.
>
> >From measurements:
>L1 is the open circuit inductance of the primary coil
>L2 is the open circuit inductance of the secondary coil
>Ls is the stray inductance measured on primary side with secondary coil
>shorted
>
>Calculated:
>Lp is effective primary inductance with Lp equals L1 minus Ls
>n is primary to secondary turn ratio with n equals sqare root (Lp div by L2)
>k is coupling factor with k equals square root (Lp div by L1)
>M is mutual inductance with M equals square root (Lp times L2)
>
>SPICE model for L1, L2, Ls: 45uH, 20uH, 5uH, k results in 0.943
>L_L1 1 0 45u
>L_L2 2 0 20u
>K_K1 L_L1 L_L2 0.943 Kbreak
>
>Tweak the equations as needed (What is in that data sheet?). You can put in
>non-linearity by editing a core model (instead of Kbreak). Model parameters
>are e.g. flux area, flux path length, gap, saturation factor.
>
>Thomas
>
>
> > -----Original Message-----
> > From: si-list@xxxxxxxxxxxxxxx [mailto:si-list@xxxxxxxxxxxxxxx]
> > Sent: Wednesday, January 28, 2004 3:46 AM
> > To: si-list@xxxxxxxxxxxxxxx
> > Subject: [SI-LIST] Digest Number 985
> >
> > Message: 1
> > Date: Tue, 27 Jan 2004 11:40:58 -0600
> > From: Chuong Nguyen <johnnguy@xxxxxxxxx>
> > Subject: Transformer Spice Model
> >
> > Hi,
> >
> > Does any one know how to construct a transformer's spice
> > model from its
> > datasheet?
> >
> > thanks,
> > jcn
>
>
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