Max Frequency of PWM Generator (DC-DC) (from SimPowerSystems)

I've been modeling a simple buck converter in SimPowerSystems. One of the blocks I'm using is a PWM Generator to drive my switch. What I've noticed is that as I get higher in frequency (I'm operating at 31.25 kHz), the duty cycle starts to veer away from the input.

Is there a maximum frequency of this block?

If so, what would be a good alternative? I'm assuming that the problem lies within the triangle generator, so it rules out me building my own from those blocks.

[Isaac]

So I've found that if I use a sample time that is extraordinarily higher than the actual frequency that it tends to get closer (but never exactly to) the duty cycle that I'm putting in.

At the moment, I'm having to use a sample period that is 200 time higher than the desired frequency.

Answer 1

[Joel Van Sickel]

adjusting solver settings should allow this, you can go significantly faster than 31 khz in the tool, but step size needs to shrink accordingly.

This answer is part of a MATLAB Answers cleanup effort for unanswered questions that are outstanding.