Analysis and Design of Quadratic Following Boost Converter

Abstract

A boost converter which closely follows the quadratic converter voltage gain is proposed in this article. At tradeoff duty ratios, this converter is able to boost a lower input dc voltage to higher values at load side, higher than the traditional boost converter. This article also proposes a double-loop voltage-mode controller (DLVMC) for load voltage regulation, which exhibits better reference tracking as well as robust performance over the conventional proportional-integral-derivative (PID)-type robust controller. Also, addition of load voltage forward term suppresses the sensitivity and stability issues. An analytical and graphical approach is established to formulate the stabilizing region for the DLVMC parameter set. Parameter-space approach is the basis for the evolution of all possible controller parameter stabilizing regions. Furthermore, guaranteed combined sensitivity and guaranteed up–down glitch margin-related multiple performance constraints are simultaneously adopted in addition to absolute stability. As a result, any parameter combination corresponding to these stabilizing regions definitely ensures the proposed closed-loop converter system stability with sufficient robustness. An optimization methodology using integral time square error performance index is adopted to arrive at the optimal parameter set for DLVMC belonging to robust stabilizing regions. In order to assess the efficacy of the proposed robust controller design technique, a 75-W laboratory prototype is designed for experimentation. The DLVMC effectiveness in terms of load voltage regulation against the load and source perturbations along with reference tracking features is demonstrated experimentally. To also highlight its performance improvements, dynamic responses are compared and illustrated with the sample PID controller dynamic performance characteristics.