Analysis of two-input Switched Inductor-Capacitor Hybrid Buck-SEPIC DC-DC converter

Abstract

This paper introduces a Two-input Switched Inductor Capacitor Hybrid Buck-SEPIC DC-DC converter (TISICHBSC) topology useful for various DC power applications. The converter falls into a category of electrically coupled Multi-input DC-DC Converters (MICs) which can provide adequate bucking of voltage even at higher duty ratios. As it offers excessive bucking the converter uses additional energy storage elements, so it is of sixth order family MIC. It is a modified converter topology of earlier proposed Two-input Hybrid Buck SEPIC (TIHBSC) converter. A 36/12 V to 24 V, with power capacity of, 100W prototype is considered to validate the proposed concept. The controllers are designed in discrete domain based on Quantitative feedback theory (QFT) to obtain the robust performance. The theoretical analysis is validated through simulations.