My LTSpice simulation is too slow

AI Thread Summary
To speed up LTSpice simulations, users can change the integration method to trapezoidal, decrease the tolerance, and add large resistors in parallel with inductors. Reducing the simulation duration and recording less data can also enhance performance. The discussion highlights the importance of adjusting the time-step, especially when switching occurs on a microsecond scale for extended periods. Users are encouraged to evaluate the necessity of long simulation times. Implementing these strategies can significantly reduce simulation time.
ernd59
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Hi,

How can i make my Ltepsice simulation faster ?

it is taking me too much time (three days and it is not complete)

the Defi diodes are supposed to hold up to 4 kv
 

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hi

what computer system are you running it on ?
what are its spec's ?
 
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davenn said:
hi
Windows 7

spec.PNG

what computer system are you running it on ?
what are its spec's ?
 
can you provide the model for the diodes?
 
some things you can do to make it faster...

change the integration method to trapezoidal.
decrease the tolerance.
put large (10 meg) resistors in parallel with the inductors.

sim it for less time.
record less of the simulation.

You are running a simulation at a very small time-step (switching is occurring on a microsecond scale) for 30 seconds. is that necessary?
 

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