Modeling The Input Step Response Of A Power Converter

Focus:

Conventional methods of defining power converter stability are based on the analysis of the frequency response of the unlocked feedback loop. This is a straightforward way of obtaining the gain and phase margins, and says something about how the converter will respond to a load step, but nothing about how the converter output reacts to an input voltage step. Knowledge of the control system reaction to the input voltage step is important because it allows the designer to immediately define whether the power converter will work correctly. This can be done by obtaining the closed-loop system response to an input voltage step. The derivation of the needed transfer function is described here for the familiar buck converter and a design example is presented.

What you’ll learn:

• How to model the input step response of a buck converter

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Author & Publication:

Gregory Mirsky, Continental Automotive Systems, Deer Park, Ill., How2Power Today, Oct 16 2017

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