A Novel Modified Switched Inductor Boost Converter with Reduced Switch Voltage Stress

Abstract

DC-DC power converters are necessary to step-up the voltage or current with high conversion ratio for many applications e.g. photovoltaic and fuel cell energy conversion, uninterruptible power supply, DC microgrid, automobile, high intensity discharged lamp ballast, hybrid vehicle, etc. in order to use low voltage sources. In this project, a modified SIBC (mSIBC) is proposed with reduced voltage stress across active switches. The proposed mSIBC configuration is transformerless and simply derived by replacing one diode of the classical switched inductor structure with an active switch. As a result, mSIBC required low voltage rating active switches, as the total output voltage is shared between two active switches. Moreover, the proposed mSIBC is low in cost, provides higher efficiency and required the same number of components compared to the classical SIBC. The experimental results are presented which validated the theoretical analysis and functionality, and the efficiency of the designed converter is 97.17%. The proposed mSIBC converter provides higher voltage conversion ratio compared to classical converters e.g. boost, buck-boost, cuk, and SEPIC. The newly designed configurations will aid the intermediate power stage between the renewable sources and utility grid or high voltage DC or AC load. Since, the total output voltage is distributed among the two active switches, low voltage rating switches can be employed to design the power circuit of the proposed converter. The classical boost converter or recently proposed switched inductor based boost converter can be replaced by the proposed mSIBC converter in real-time applications such as DC microgrid, DC-DC charger, battery backup system, UPS, EV, an electric utility grid. The proposed power circuitry is cost effective, compact in size, easily diagnostic, highly efficient and reliable.

A high step‐up DC–DC converter with active switched LC‐network and voltage‐lift circuit: Topology, operating principle, and implementation

“…The common grounded load converters are practical in applications such as PV systems, DC MGs, and so forth. A novel modified boost converter in Sadaf et al 19 is suitable for PV applications due to grounded load. Also, a switched inductor‐based boost converter is introduced in Sadaf et al 20 The common ground connection of source and load in the proposed converter circuit is suitable for DC MG integrated with solar PV.…”

Parameter optimization design and performance analysis of filter‐integrated switched boost grid‐connected inverter

“…Although these topologies have excellent boost performance and high voltage utilization, boosting at the DC side is bound to bring high voltage stress on the switches in the inverters. 13 In existing grid-connected system, besides the boost converter at the front of the inverter, a filter after inverter is also needed to suppress the harmonics. Compare with the L and LC filter, LCL filter has been applied and studied more widely because of its excellent harmonic suppression effect and the need for smaller volume.…”

“…On the basis of this method, many experts and scholars have carried out the research on dc/dc boost topologies, and proposed high efficiency topological structures to realize boost function. Although these topologies have excellent boost performance and high voltage utilization, boosting at the DC side is bound to bring high voltage stress on the switches in the inverters 13 . In existing grid‐connected system, besides the boost converter at the front of the inverter, a filter after inverter is also needed to suppress the harmonics.…”

Analysis and Investigation of Hybrid DC–DC Non-Isolated and Non-Inverting Nx Interleaved Multilevel Boost Converter (Nx-IMBC) for High Voltage Step-Up Applications: Hardware Implementation

“…Photovoltaic technology is tenaciously growing with betterment in photovoltaic cells which ultimately leads to the priceless powered nation and the world too [6]. More and more renewable energy sources such as solar arrays, wind turbines, and fuel cell stacks are widely employed for front-end DC/DC applications [7], [8]. These inexhaustible energy sources need a DC-DC converter with a high conversion ratio to augment the voltage magnitude to feed the power grid or power DC-AC converter (Inverter) [9], [10].…”