When should zero-order hold be adopted?

fire
Tue, 26 Jul 2022 09:25:46 +0000
PLECS

hey, I am studying using plecs, and I meet a problem that I don’t know when zero-order hold should be adopted,

the example is attached, and it can run without zero-order hold, but when ZOH is added, the waveforms is bad,

why? And can you find other questions in this simulations?

Thank you

best wishes

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