Do you know why this simulation fails at 12us?

[alexbilo]

Hi,

Do you have any idea why this simulation would stop simulating at 12us? It's a very simple circuit and I tried changing the component's values, the current source setpoints, etc. with no luck.

Thank you,

Alex

[lacy]

O.K. Here's what I found. Double click on the PWL Source on the right had side of the schematic. In the pop-up window at the very bottom you will notice a check box that says "Repeat data during simulation". Uncheck that box and it will simulate.

I have no idea why this is, but maybe some can tell us that information.

I hope this helps. Have A Nice Day

[lacy]

I want to make an addition to my last post. I said that after making the change it will simulate, but I am not sure it is simulating correctly as I don't have that much experience with the PWL source (I have never had occasion to use it).

I thought I would just make that clarification.

Have a Nice Day

[alexbilo]

Hi,

I know that the simulation will run if I disable this option, but this isn't what I want to do. This option is used to make the defined current signal periodic. If it is disabled, the signal will be active for one cycle and then it will keep the last value.

Thanks for the help anyway, but the simulation should run with this option enabled.

Alex

[lacy]

Here's something to try other than my first suggestion. It seems to at least simulate now with the option Repeat turned on. What I did was set the first time to 1e-008 instead of zero in the PWL Source listing. Also, you are going to have to change the amp rating on the Coil as it is blowing out each time the simulation starts. I have mine set to 20A.

I hope this helps some.

Have A Nice Day

[lacy]

Error correction: that value should be 1.5e-008. Sorry abou that typo

[alexbilo]

Thanks for the fix lacy. At least I can get a rough idea of the results for this circuit. However, this is still abnormal that the simulation fails with an unknown error when the first time in the table is 0.

The inductor also shouldn't blow since the PWL current is always below 0.5 amps and the peak inductor current rating is at 0.5 amps.

Thanks,

Alex

[lacy]

Your welcome. I try my best. Nestor may have better information than I do. When he is available I hope he reads this post and may provide an explaination to both of us.

Have A Nice Day

Edit: As far as the conductor blowing, I went back and set it to 1A and it worked fine. It is my theory that with the capacitor acting a short at power up there may be a current rush above the rating for a brief time, just enough to blow the coil at .5 A (this is just theory and I could be wrong). I am unable to measure this surge, so this is conjecture on my part.

Message Edited by lacy on 09-24-2007 08:31 AM

[Tien_P]

Hi All,

This looks like a convergence problem.  I was able to simulate this circuit by changing TMAX.  Select Simulate>>Interactive simulation setting, I reduced TMAX from the default value of 1e-5 and changed it to 1e-7 sec. 

[lacy]

Thanks Tien, that worked great on my machine. Your time and response is greatly appreciated.

Have A Nice Day