Modeling, Simulation and Design of Variable Structure Based Sliding Mode Controller for KY-Voltage Boosting Converter

– The demand of the non-isolated voltage-boosting converters has experienced an unprecedented augmentation in the last decade. The diversified application domains host the variety of specifications and rating on DC/DC converters and several variations has been addressed, in addition to the basic buck and boost converters. The main issue with them is presence of objectionable level of voltage ripple, which is due the current pulsation. KY series of converters offer solution to this issue and they always dwell in continuous conduction mode (CCM) and imitate the synchronous rectification in performance. This paper presents the analysis, design and load voltage control of positive output KY voltage boosting converter (KY-VBC) using variable structure based sliding mode controller (SMC) for purposes needing the fixed power supply in battery operated portable devices, computer peripheral devices, various medical equipments, industrial and robot system applications etc. The SMC is developed for the innately variable-nature of the KY-VBC with help of the state-space average based model. The performance characteristics of the SMC are verified for its robustness to perform over a wide range of operating conditions through MATLAB/Simulink model in comparison with linear proportional-integral (PI) controller. Theoretical analysis and simulation results are presented along with the complete design procedure. Key-Words: DC-DC power conversion, KY-boost converter, sliding mode controller, proportional integral controller, state-space average model.