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Random Dropped Pulses when using PWM
Posted Dec 2, 2010, 12:31 PM EST Studies & Solvers Version 3.5a 4 Replies
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This produces 5 second pulses of 2V which repeat every 30 seconds.
When I run my simulation, looking at the temperature of the iron block as a function of time, I can see when the pulses are on because of the spike in heat around the resistive heaters.
My problem is that COMSOL will randomly drop certain pulses on each simulation. Usually the first pulse occurs, but often the following pulses will not. If I repeat the simulation again, without changing anything at all, I will eventually get results in which I can see 3 successful pulses occur. I have yet to see the 4th pulse occur.
Is there any reason why COMSOL would choose to drop random pulses sometimes, but not all the time?
Is there something in my solver parameters that may fix this?