Direct output-voltage control of nonminimum phase higher order DC-DC converters

Garza-Arias, Enrique, Mayo-Maldonado, Jonathan C., Valdez-Resendiz, Jesus E., Escobar, Gerardo, Rosas-Caro, Julio C. and Guillen, Daniel (2022) Direct output-voltage control of nonminimum phase higher order DC-DC converters. IEEE Transactions on Industrial Electronics, 70 (2), 1455-1466. (doi:10.1109/TIE.2022.3157984).

Abstract

This article addresses a fundamental issue in power converter control. Namely, the direct output-voltage control of power converters with higher order dynamics. We argue that despite of the burst in the development of new topologies, legacy control design principles-inherited from second-order converter analysis-have been unduly adopted as de facto rules of procedure. In particular, we refer to the minimum-phase requirement on the feedback variable, as the underlying stabilizing mechanism. In this article, we demonstrate that the requirement of minimum-phaseness for higher order converters and the legacy ad hoc solution via ancillary current control, can be bypassed without compromising closed-loop performance. To prove this, we unveil important differences between stability properties of second-order and higher order converters. Then, we introduce new linear and nonlinear control design strategies that permit direct output-voltage control. Experimental results are provided to validate the theory.

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Contributors

Author: Jonathan C. Mayo-Maldonado

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