How to Determine the Input Impedance of a Buck Converter

This tutorial video uses PSIM to determine the input impedance of a buck converter which has a multi-loop control scheme consisting of an inner current loop and outer voltage loop. The method used in the video is applicable to any power converter topology.
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Why is PSIM preferred for Power Electronics simulation? - hubs.ly/H0f9wFX0
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Why you should use PSIM for device level simulations - hubs.ly/H0f9wDk0