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Multiple Sampling during switching interval

0 votes
What is the easiest way to implement an interleaved sampling approach for 3 parallel DC-DC converters? I want to sample each individual control loop (three in parallel) at the begining of the individual switching intervals. However, the ZOH only allows setting of the sample time, and not setting of a phase delay between multiple sampling. Any insight is appreciated.
asked Oct 29, 2020 by tbeechner (16 points)

1 Answer

0 votes

It's not immediately obvious, but the ZOH parameter is a Discrete-Periodic sample time input.  That means you can enter the sample time as "Tp" or "[Tp,To]" where Tp is the sample period and To is the offset in seconds within that sample period (0≤To<Tp).  A basic example is attached. 

Another approach would be to use triggered subsystems.  The nice thing about that approach is you can visualize how the trigger is aligned in a scope.

answered Oct 29, 2020 by Bryan Lieblick (1,941 points)
This is just what I was looking for - thank you.