Comparative study of two model-based controllers for a quadratic boost converter

摘要

Two model-based controllers for the quadratic boost converter with different number of sensors are presented and compared. The quadratic boost converter model is a bilinear control system whose linearization has complex right-half plane zeros. Common-use controllers consist in current and voltage control loops and rely on the requirement that the current dynamics is faster than the voltage dynamics. Controllers that are reviewed in this paper aim at the output voltage regulation and are obtained by requiring that the derivative of an energylike function be negative semi-definite along the trajectories of the closed-loop system. The considered controllers make use the complete four state variables and a subset of the state variables. The controllers include a load conductance estimation scheme to cope with possibly variations of the converter load. Closed-loop operation is verified via numerical simulation under equal conditions.