Convergence Assistant (error of the Op-Amp)

Hi all

This is my first post here, and I am familiar with Multisim on a basic level. I created my sim file based on a pattern that I was not designed. I get the error message:

A simulation error occurred. You want to run the wizard of Convergence to try to resolve this problem automatically?

Most every time I hit Yes, convergence assistant is able to solve the problem, but he is unable to fix this circuit. I think the problem is with the amplifiers and tried to tinker around to fix.

I have included:

  1. JPG file sim
  2. Schema of the source GIF
  3. Multisim file

Any ideas? Thank you.

Moreover, it is a pulse width modulator used to keep the constant running rms.

Hello

I took a glance at your circuit, and it seems that the question of convergence is in the template that you use.  The model is a 3-terminal op amp; in other words, only the input and output pins are modeled and not the power supply.  This leads to problems of in your circuit in question because you have some operational amplifiers in open-loop configurations expected that output will be cut to supply voltages.  But because the power supplies are not modeled, the output is not be truncated, and so very great tension values produce outputs.

I have replaced the template you are currently using in the circuit (ITI/LM324A) by another who does not model power supply (ITI/LM324A_2).  It seems that solved the issue of convergence.  The modified file is attached.  There are also specific models to the LM324 provider in the database in case you use a specific component of the seller (depending on your version of Multisim).

Let us know if that fixes the problem.

Tags: NI Software

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