Dynamics and control of voltage multiplier cells integrated boost converter

Abstract

This paper presents a reduced order sliding mode controller based on hysteresis modulation for a boost converter with single voltage multiplier cell (VMC) operating in continuous conduction mode. Although VMC integrated boost converter improves the static gain without extreme duty cycle, it increases the number of components which in turn increases the order of the system. Due to complexity in control of higher order converters, a reduced order sliding mode controller is suggested in this study to reduce the number of sensors. Both static and dynamic performances are improved by considering only two control parameters, the input inductor current and the output capacitor voltage of the VMC integrated boost converter. The robustness of SMC over line variation, load variation and parameter variations are revealed through simulation and compared with conventional PI controller. Inrush current of the VMC integrated boost converter is observed to be high and a startup control with an auxiliary diode is incorporated. A prototype model of a 100 W boost converter with single VMC controlled by SMC is designed and implemented to validate the simulated results. A VMC integrated boost converter with SMC approach offers high voltage gain at reduced duty cycle with improved dynamic characteristics.