Coupling Surface Charge Density from Electrostatics to Electrical Circuit

Hi,

I have made a model of a varying overlap capacitor with an electric potential on one side as an electret. It seems to work with just ES and ALE but once I add in CIR and set the top electrodes as circuit terminals for the electric circuit, the study takes much too long and doesn't finish so I don't believe that will result in a correct answer.

I have instead integrated the surface charge density over the surface of the top electrodes and am able to show that it changes over time, hence a current (shown in image). But how can I couple this current to the electric circuit model?

Thanks,
Jeffrey