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Piezoelectric transformer interfaced with electrical circuit.

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Hello,

I have made a piezo transformer model and wish to drive it using an external electrical circuit interface.
I have made connections to the electrical circuit elements using a voltage source, a small input resistor and a load at the output terminal.
It is basically a 3-terminal device, wherein the input and output electrodes have a common ground.

After doing a frequency domain study, I get the following error:

Failed to find a solution for the initial parameter.
Maximum number of segregated iterations reached.
Returned solution is not converged.

I'm not sure if the error is with the electrical circuit interface or something to do with the meshing/tolerance/solver since the model simulated fine before addition of the electrical circuit interface, plotting susceptance and electrical potential.

Anyone who would be able to throw some light, it would be of great help to me. I have attached the model and the diagrammatic representation of the entire model.
Thanks!

Sneha

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