Controllability Analysis and Controller Design of Higher Order Novel Switched Inductor–Capacitor DC–DC Converters
Sija Gopinathan, V. Seshagiri Rao, Kumaravel Sundaramoorthy
Abstract
Performance analysis and controller design of novel switched inductor-capacitor high gain DC-DC converters that are formed by a switch-diode-inductor-capacitor network (SDLCN), viz., converter A and converter B are presented in this paper. Using the proposed structure of the components to form the SDLCN, the converters A and B have continuous input current, better efficiency due to lower voltage and current stress, and minimum component count compared to some of the conventional DC-DC converters. To analyze the controllability of these converters, a switched linear system model is developed for the proposed converters. For better accuracy, the effect of parasitic elements is considered in the model. The controllability is validated by experiments on a 380 V, 50 kHz, 200 W laboratory prototype. From the switched linear system model, a small signal model and nominal transfer functions are obtained, and validated experimentally. Using the stability boundary locus technique and Kharitonov's first method, the PI controllers are designed. This technique selects a resilient performance zone for closed loop converter operation by considering source and load side disturbances. The developed PI controllers are implemented in the Xilinx System Generator (XSG) and the closed-loop performance is validated experimentally.