PID Digital Controller Design

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Mohammad
Mohammad 2016-1-16
Hi I design a PID controller for a buck converter and discrete it by matlab with ZOH and Ts=500 ns and it work. However, this controller does not work for other time-step, such 100 ns or 1000ns. For other time-step the output is 0! How we can find the optimum time-step to for a digital controller?
Thanks

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