Fast Response of Deviation-Constrained Hybrid Controllers for Indirect Energy Transfer Converters

Abstract

This paper introduces and surveys a new family of transient-oriented controllers for indirect energy transfer converters. The controllers incorporate a peak current programmed mode control for steady-state operation and a nonlinear, state-plane-based transient-mode control schemes for load transients. The new controllers facilitate extremely fast convergence from a loading transient to the new steady-state operating point while constraining the output voltage and inductor current deviations to a desired (minimal) value. As a result, the loading transient performance of indirect energy transfer converters can be significantly improved since two control objectives (convergence time and minimal components’ stress) are simultaneously obtained. A detailed principle of operation of the controllers is provided and explained through a state-plane analysis. The operation of the controllers is experimentally verified on a 30 W 3.3 V-to-12 V boost converter, demonstrating a significantly lower output voltage deviation and lower peak inductor current when compared to time-optimal control, allowing for volume reduction of the converter.