Comparative Simulation Analysis on High Gain Bidirectional and High Step-up DCDC Converters

Abstract

Abstract-This article mainly focuses on a comparative analysis on high gain bidirectional and high stepup soft-switching DC-DC converters for high gain high power applications. These converters are useful for high step up and step down conversion with reduced switching losses. These converters obtain zero voltage switching turn-on and zero current switching turn-off operation of the semiconductor switches by utilizing the simple series resonant capacitor and inductors respectively. The advantages of these converters are minimized voltage and current stresses, which improves overall converter efficiency. This paper describes the operational principles of bidirectional and high step-up converters as well and their simulation evaluations were compared in order to show their effectiveness of these topologies. Keywords -Buck, Boost, non-isolated, Zero voltage switching (ZVS), Zero current switching (ZCS)I. INTRODUCTION The bidirectional DC to DC converters are most popularly used to transfer from high voltage to low voltage and vice-versa. These converters are extensively used in many industrial applications such as uninterrupted power supply systems, hybrid electric vehicles, auxiliary supplies and battery banks for storing of energy etc. A variable inductor based bidirectional converter increases the saturation level and reduces its magnetic core size [1] of power inductor, because of variable inductor under the dynamic load variations leads to increasing the additional losses. However, the overall efficiency may reduce. A bidirectional DC-DC converter [2] implemented with the parallel connection of IGBT and MOSFETs were used to reduce conduction losses and improved the voltage gain. A loosely coupled inductor (LCI) based high power density interleaved boost converter [3] obtained improved efficiency and reduced power losses, respectively. However, the converter is cost-effective due to the SiC (silicon carbide) switching devices are used. A dual half bridge DC-DC converter [4][5][6] are obtained zero voltage switching to the semiconductor devices with the aid of leakage inductances of their high frequency transformer and snubber capacitors with the MOSFETs. They achieved a poorer efficiency, due to high switching frequency operated at higher output power levels. To choose an efficient DC-DC converters, a vast comparison of various converters is presented in [7], which are used to interface fuel cells in electric vehicles. The isolated soft switching converter achieves ZVS and ZCS with low efficiency by operating the circuit in discontinuous conduction mode (DCM) [8]. A non-isolated interleaved boost converter [9-10] achieved high gain and ZVS with the aid of coupled inductors and active clamping circuits, respectively. Furthermore, it has higher efficiency at low power and lower efficiency at high power. A cascaded buck-boost inductor in middle and cascaded buckboost capacitor in middle converters [10] are comparing their efficiency at 10kW and achieved efficiency is 92%.This article presents the comparative simul...