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Current-mode control is one of the most popular controller strategies forpower converters. With the advent of wide bandgap devices including GaN andSiC, higher switching frequencies have become more viable at higher powerbecause of lower switching losses. However, the advantage of higher switchingfrequency for faster, higher bandwidth control is squandered because of currentsensor interference. We present a framework for characterizing and analyzingthis interference as uncertainties to the controller model. These uncertaintiesintroduce additional dynamics and nonlinearity that can result in instabilityand poor transient performance of the current control loop. In this paper, weprovide a model framework based on a new control conditioning approach thatguarantees global stability and a strategy for optimizing transientperformance. In Part II of this paper series, we present the analysis, design,and hardware validation of three effective solutions.

Overcoming High Frequency Limitations of Current-Mode Control Using a Control Conditioning Approach -- Part I: Modeling and Analysis