Re: [Scilab-users] Faster PWM signal

[Gary Nelson]

Mike,
Since you are modeling the circuit, it does not have to run in real time. You 
could get meaningful results by running at (for example) 10sec simulation time 
= 1sec real time. 

Gary Nelson, PhD

Life is complex.
It has real and imaginary parts

> On Oct 16, 2015, at 12:50 AM, Serge Steer  wrote:
> 
> Try with lower solver tolerances  with the Simulate/Confiure menu.
> 
> Serge Steer
> Le 15/10/2015 18:53, Michael Greenish a écrit :
>> Hello,
>> 
>> I am modeling an electrical circuit.  I have a voltage across an inductor 
>> being switched on the ground side.  I am generating a pwm using a sawtooth 
>> genartor as shown by the attached image.  In my circuit, my PWM switches at 
>> 50kHz.  When if I set the sawtooth generator period to > 0.025, the results 
>> look as expected on the graphs.  If the sawtooth generate period is < 0.025, 
>> the results are flat; the system can't seem to calculate at that interval.  
>> The period on the timer attached to the scope is 0.0001.
>> 
>> I am only at 25ms, I need to get to 0.02 ms to match my real-life circuit.  
>> Is there a limit of the system I am running into or do I have a parameter 
>> wrong?
>> 
>> Thanks,
>> 
>> Mike Greenish
>> 
>> 
>> 
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Re: [Scilab-users] Faster PWM signal

[Serge Steer]

Try with lower solver tolerances  with the Simulate/Confiure menu.

Serge Steer
Le 15/10/2015 18:53, Michael Greenish a écrit :
> Hello,
>
> I am modeling an electrical circuit.  I have a voltage across an
> inductor being switched on the ground side.  I am generating a pwm
> using a sawtooth genartor as shown by the attached image.  In my
> circuit, my PWM switches at 50kHz.  When if I set the sawtooth
> generator period to > 0.025, the results look as expected on the
> graphs.  If the sawtooth generate period is < 0.025, the results are
> flat; the system can't seem to calculate at that interval.  The period
> on the timer attached to the scope is 0.0001.
>
> I am only at 25ms, I need to get to 0.02 ms to match my real-life
> circuit.  Is there a limit of the system I am running into or do I
> have a parameter wrong?
>
> Thanks,
>
> Mike Greenish
>
>
>
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> users mailing list
> users@lists.scilab.org
> http://lists.scilab.org/mailman/listinfo/users

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Re: [Scilab-users] Faster PWM signal

[Michael Greenish]

@Serge: Thank you for the idea!
I found my problem for running faster.  It turns out the slope of the triangle 
waveform is independent of the period so I had to apply a greater gain for the 
sawtooth for it to cross zero.  Now I am running at 50kHz.

Thanks,
Michael Greenish
  From: Serge Steer <serge.st...@inria.fr>
 To: users@lists.scilab.org 
 Sent: Friday, October 16, 2015 9:50 AM
 Subject: Re: [Scilab-users] Faster PWM signal
   
 Try with lower solver tolerances  with the Simulate/Confiure menu.
 
 Serge Steer
 Le 15/10/2015 18:53, Michael Greenish a écrit :
  
 

 Hello, 
  I am modeling an electrical circuit.  I have a voltage across an inductor 
being switched on the ground side.  I am generating a pwm using a sawtooth 
genartor as shown by the attached image.  In my circuit, my PWM switches at 
50kHz.  When if I set the sawtooth generator period to > 0.025, the results 
look as expected on the graphs.  If the sawtooth generate period is < 0.025, 
the results are flat; the system can't seem to calculate at that interval.  The 
period on the timer attached to the scope is 0.0001.
  
  I am only at 25ms, I need to get to 0.02 ms to match my real-life circuit.  
Is there a limit of the system I am running into or do I have a parameter 
wrong? 
  Thanks, 
  Mike Greenish
  
   
  
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[Scilab-users] Faster PWM signal

[Michael Greenish]

Hello,
I am modeling an electrical circuit.  I have a voltage across an inductor being 
switched on the ground side.  I am generating a pwm using a sawtooth genartor 
as shown by the attached image.  In my circuit, my PWM switches at 50kHz.  When 
if I set the sawtooth generator period to > 0.025, the results look as expected 
on the graphs.  If the sawtooth generate period is < 0.025, the results are 
flat; the system can't seem to calculate at that interval.  The period on the 
timer attached to the scope is 0.0001.

I am only at 25ms, I need to get to 0.02 ms to match my real-life circuit.  Is 
there a limit of the system I am running into or do I have a parameter wrong?
Thanks,
Mike Greenish



Inductor PWM noise.zcos
Description: Binary data
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