Polytopic Robust Stability for a Dual-Capacitor Boost Converter in Symmetric and Non-Symmetric Configurations

Abstract

The step-up power electronic converter, which is easily implemented with two symmetric parallel-boost stages, has recently been proposed in the literature, showing considerable voltage gains with no excessive duty cycle, thus minimizing heat and other adverse effects. Its other advantages are floating-output voltage and increased power density because of the diminution of the capacitors’ voltage rating. In this paper, the Lyapunov-based robust stability of a converter operating in both closed- and open-loop is proved, showing its versatility even during the variation of parameters, which nullifies the symmetry of the converter. Simulation and experimental data allow the corroboration of the analysis.

Keywords

• symmetric converter
• stability analysis
• double capacitor
• step-up converter