[SI-LIST] Transformer Spice Model

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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