# LTspice simulation problem - energy harvesting rectifier circuit

SO the circuit below is an approximation to an electrostatic energy harvesting system and device. Basically I want to observe the charging voltage waveform across the cap C3. In real life the cap charges in a few hours but I do not think LTspice likes completing that many iterations without converging on a steady state condition. It just either stops working after a while or gives a 'singular matrix' error (after the first iteration)depending upon the value I use for the cap C3.

Is there anyone that is handy with Ltspice that could tell me how to make it like this sort of transient analysis?

Perhaps this system just has too high source impedance for LTspice?

• Try with a real diode model instead of ideal ones – PlasmaHH Oct 2 '16 at 9:55
• One theory I have now while trying out your circuit is that LTspice perhaps doesn't handle longer timespans. It might be problems with floats/doubles if it has to work with nanosecond delta-times when the actual time is in the thousands. Adding more precision didn't help though, so maybe it's a flawed theory. – pipe Oct 2 '16 at 10:41

• It works with the default diode, too. For example with this model: .model d d ron=1 roff=100meg vfwd=0.7 vrev=1k epsilon=100m revepsilon=50m it charges close to 190V. – a concerned citizen Oct 2 '16 at 13:06