I am running a transient model of a Type-E PFN circuit (probably not an important detail) and my processing time jumps from about 1 minute for one DC source voltage to roughly 475 years for another.
My circuit basically charges up a series of capacitors and switches the voltage into a resistive load at 1us.
However when I set the charge voltage to 80kV the model hangs up at ~2ps and the processing time drops to something like 1 fs/s wich will never finish.
Does anyone have any idea why the charge voltage would effect the model? It works for 30k, 50k, 100k and scaled values (i.e. 30V, 50V, 100V), but does not work for 70k, 80k, etc.
It consists of 4 stacked versions of the first picture to multiply the voltage. I am relying on the DC operating solution to generate a floating voltage on my capacitors in the PFN (so I can't use uic I think). I found that I cannot use .ic for these voltages because they will all be ground referenced and the model wont work.