부산대학교 도서관

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 article. 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, and 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 and the closed-loop performance is validated experimentally.