[SI-LIST] Re: Transformer Spice Model
- From: steve weir <weirsp@xxxxxxxxxx>
- To: esayre@xxxxxxxx, beneken@xxxxxxxxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 12 Feb 2004 10:33:11 -0800
Ed, the models in isSpice are pretty good. They have an extensive
component database for real transformers and chokes from Coiltronics and
others.
Regards,
Steve.
At 12:37 PM 2/12/2004 -0500, Dr. Edward P. Sayre wrote:
>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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>
>
>
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