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Time varying coupling coefficient for 2 inductors

ttakeshian All Messages By This Member #46981 I need to model the coupling coefficient of two inductors as a function of time. I tried using combination of .func and .param statements to pass a time varying variable to the spice K component without success. I also have tried the trick used for defining a time varying resistor using a voltage of a node in the schematic. Any suggestion would be greatly appreciated. tony
analog spiceman All Messages By This Member #46985 --- In LTspice@..., Tony "ttakeshian" wrote: I need to model the coupling coefficient of two inductors as a function of time. I tried using combination of .func and .param statements to pass a time varying variable to the SPICE K component without success. As you have noted, K must be a fixed value. However, LTspice includes a behavioral inductor that may be a function of time. I suppose you could set up a T-network of three such inductors to vary with time the percentage of inductance shared between each side of the "T" while keeping the total inductance "seen" from each side fixed (this is what K effectively does). If you require other than a one-to-one turns ration, you could add an ideal transformer to one side of the T. -- a.s. PS: The behavioral inductor is well described in Help and in the many examples available here in the group archive, both in past messages and in files posted.
Rick All Messages By This Member #46996 --- In LTspice@..., "ttakeshian" <ttakeshian@...> wrote: I need to model the coupling coefficient of two inductors as a function of time. I tried using combination of .func and .param statements to pass a time varying variable to the spice K component without success. I also have tried the trick used for defining a time varying resistor using a voltage of a node in the schematic. Any suggestion would be greatly appreciated. tony Tony, LTspice can be used to model any system of ordinary (not partical) differential equations using "analog computer" techniques. The coefficients can be made time varying by using BV elements that are a function of time. Rick
Ganesan #47000 I have modeled an ideal transformer with time varying coupling coefficient.. File is in Temp--> Non_ideal_transformer.asc <> Your feedback will be appreciated. Cheers A. Ganesan toggle quoted message Show quoted text On 9/16/2011 11:02 AM, ttakeshian wrote: I need to model the coupling coefficient of two inductors as a function of time. I tried using combination of .func and .param statements to pass a time varying variable to the spice K component without success. I also have tried the trick used for defining a time varying resistor using a voltage of a node in the schematic. Any suggestion would be greatly appreciated. tony
Ganesan #47001 I forgot to add.. The flux doesn't collapse instantaneously... This can be modeled by putting V(X) through an RC low pass. Cheers AG toggle quoted message Show quoted text On 9/16/2011 5:55 PM, Ganesan wrote: I have modeled an ideal transformer with time varying coupling coefficient.. File is in Temp--> Non_ideal_transformer.asc <> Your feedback will be appreciated. Cheers A. Ganesan On 9/16/2011 11:02 AM, ttakeshian wrote: I need to model the coupling coefficient of two inductors as a function of time. I tried using combination of .func and .param statements to pass a time varying variable to the spice K component without success. I also have tried the trick used for defining a time varying resistor using a voltage of a node in the schematic. Any suggestion would be greatly appreciated. tony No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.914 / Virus Database: 271.1.1/3900 - Release Date: 09/16/11 01:34:00

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