Simulation Tool?

Rabbedrengen · 8th December 2007, 04:26 PM

I have a lot of troubles with the simulation of switching circuits in Orcad PSPICE, which i use for all other simulations.

The common problem with PSPCICE is that the timestep decreases and reaches the program limit.

I know that it's possible to "tune" the accuracy of volts, amps, charges and increase the iteration calculation.
However it jam the simulation if the tolrances are to large.

I assume the timestep problem is founded in the high rate of di/dt and du/dt of the coils, inductors, and capacitors

My question is then, what program is best suited for switching circuits simulation?

I know TI , and Linear has a tool, but is there other programs which are better?

Those I know, but not tried:
- Simetrix
- Plecs for Matlab
- Electronic Workbench
- Tina TI
- SwitcherCAD Linear

sawreyrw · 8th December 2007, 04:40 PM

SwitcherCAD Linear (LTspice) is free and I as far as I know it is at least as good as many high priced programs.

Time step too small problems often result from using unrealistic (ideal) components without proper damping; inductors and caps with no ESR, for example.

There is a Yahoo LTspice group where these kinds of problems are discussed.

Rabbedrengen · 8th December 2007, 05:44 PM

Hi sawreyrw, thanks for your reply.

Sorry, I forgot to explain that I have added the real equivalent circuit for all capacitors and coils so they aren't ideal anymore.

I will check the newsgroup.

8th December 2007, 04:26 PM	#1
Rabbedrengen diyAudio Member Join Date: Nov 2004 Location: Denmark	Simulation Tool? I have a lot of troubles with the simulation of switching circuits in Orcad PSPICE, which i use for all other simulations. The common problem with PSPCICE is that the timestep decreases and reaches the program limit. I know that it's possible to "tune" the accuracy of volts, amps, charges and increase the iteration calculation. However it jam the simulation if the tolrances are to large. I assume the timestep problem is founded in the high rate of di/dt and du/dt of the coils, inductors, and capacitors My question is then, what program is best suited for switching circuits simulation? I know TI , and Linear has a tool, but is there other programs which are better? Those I know, but not tried: - Simetrix - Plecs for Matlab - Electronic Workbench - Tina TI - SwitcherCAD Linear

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8th December 2007, 04:40 PM	#2
sawreyrw diyAudio Member Join Date: Apr 2006 Location: Minnesota	SwitcherCAD Linear (LTspice) is free and I as far as I know it is at least as good as many high priced programs. Time step too small problems often result from using unrealistic (ideal) components without proper damping; inductors and caps with no ESR, for example. There is a Yahoo LTspice group where these kinds of problems are discussed.

8th December 2007, 05:44 PM	#3
Rabbedrengen diyAudio Member Join Date: Nov 2004 Location: Denmark	Hi sawreyrw, thanks for your reply. Sorry, I forgot to explain that I have added the real equivalent circuit for all capacitors and coils so they aren't ideal anymore. I will check the newsgroup.

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