Multiple Sampling during switching interval

Question

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.

Answer 1

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 "T_p" or "[T_p,T_o]" where T_p is the sample period and T_o is the offset in seconds within that sample period (0≤T_o<T_p).  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.

Comments

This is just what I was looking for - thank you.