Prev: USB to serial driver for FT232R in QNX 6.4.1
Next: Software bloat (Larkin was right)
From: Klaus Kragelund on 18 May 2010 19:41
On 19 Maj, 00:37, Vladimir Vassilevsky <nos...(a)nowhere.com> wrote:
> Jim Thompson wrote:
> > On Tue, 18 May 2010 20:37:28 GMT, n...(a)puntnl.niks (Nico Coesel)
> > wrote:
>
> >>EE123 <ony...(a)juno.com> wrote:
>
> >>>I am running a magnetic transformer simulation.
> >>>However, I get an error involving convergence.
>
> >>>A message comes up saying that the minimum time step
> >>>allowed is  35.00 E-15 seconds.
> >>>Is this an absolute minimum?
> >>>Or can I change it?
> >>>If so, then where because I have been searching all
> >>>over and cannot find where to change it.
>
> >>Decreasing the time step won't help. Its better to add some parasitic
> >>resistance or capacitance. Convergence problems usually indicate the
> >>simulator can't deal with the circuit.  
>
> > Shhhhh!  Don't give away our trivial secrets :-)
>
> I bet he is running a square wave...

Typical problem is a hard connection somewhere which lets the voltage/
current in the circuit take off rapidly. Remedy is to change DEVTOL to
a larger value or add resistances in series with circuit paths (10mohm
often does the trick). Also, don't use a VSRC as your PSU, use the
VPWL or VPULSE, so you can ramp up the PSU slowly like in a real
circut.

Regards

Klaus
First  |  Prev  | 
Pages: 1 2
Prev: USB to serial driver for FT232R in QNX 6.4.1
Next: Software bloat (Larkin was right)