PSPICE-FOR-TI: Using VCCS as constant power load

Thiago Faccin

Part Number: PSPICE-FOR-TI

I want to design a constant power load and I was trying to use a VCCS source to do so, but it doesn't seems to work with the expression that I'm using as GAIN = {1/(RMIN/V(n1,n2) + V(n1,n2)/PLOAD}. I've tried something simple as {2*V(n1,n2)} just to test and it gives me the same error: ERROR(ORPSIM-16048): Encoding gain/transconductance/transresistance expression. Is it possible to make a VCCS with non constant variables inside the gain expression? Is there any other way to simulate a constant power load?
Thanks, Thiago.

5 months ago

0 David Larkin 5 months ago

TI__Genius 17100 points

Hi Thiago,

Does this address your question?

https://resources.pcb.cadence.com/i/1480189-pspice-app-note-creating-impedances-with-behavioral-modeling/4?

David

0 Thiago Faccin 4 months ago in reply to David Larkin

Prodigy 25 points

Hi David,
I've read this document too. The expression that I've used is from it aswell, more precisely from page 6:

So my circuit looks like this (Rmin = 1 Ω and PLOAD = 3 W):

And than I get this:

0 David Larkin 4 months ago in reply to Thiago Faccin

TI__Genius 17100 points

Can you post your project here and I'll take a stab at it?

David

0 Thiago Faccin 4 months ago in reply to David Larkin

Prodigy 25 points

Here it is. As a test example it's intended to be very simple. I'm having trouble uploading the file directly here, so I will be leaving a link to download it.
https://file.io/qOdWX9E0iP7q, it expires in one week.