Andrii Chub

This addresses errors in [1]. Due to a production error, integral term"R(t)dt" in (21) was inadvertently published as "R(t)dtrm". This should have appeared as "R(t)dt".

Various critical applications in domains such as electric vehicles, space technology, defence, data-centers and microgrids require high power, uninterruptible and high reliability power electronic converters. This paper focusses on developing a highly modular and topology independent fault tolerant approach, making it an attractive solution for industrial applications. The paper validates the proposed approach through PLECS simulation of a 400 V and 5 kW full-bridge forward converter, and performs hardware validation at 400 V DC bus voltage as well. Further, the paper thoroughly analyses the losses, efficiency, reliability and mean time to failure of the proposed fault tolerance solution, and proves its effectiveness across various key factors in comparison to existing approaches in literature.

Wide voltage gain range dc-dc converters are vital in applications like photovoltaic and energy storage systems. Over the past decade, extensive research has focused on developing efficient converter topologies capable of accommodating a wide voltage gain range, including wide input or output voltage ranges. This paper systematically categorizes these converters into two main groups based on their approach to extending the voltage gain range (≥1:3). The first group includes topology morphing control (TMC) based dc-dc converters, which dynamically modify the converter topology through reconfiguration at either the input or output side, or by adjusting transformer turns ratio or resonant tank components. The second category comprises isolated buck-boost converters (IBBC), boost half-bridge converters (BHBC), resonant converters, and multi-phase converters. These converters achieve wide voltage gain ranges through structural modifications or control strategies. Additionally, each group is divided into subgroups that highlight their operating principles, features, and limitations. The paper also discusses challenges, including efficiency optimization and control complexity, in achieving wide voltage gain ranges. This paper serves as a valuable resource for researchers and engineers developing high-performance isolated dc-dc converters for applications requiring a wide voltage gain range. The findings provide insights into current challenges and future research opportunities, thereby supporting the development of innovative and efficient converter topologies for wide voltage gain applications.

Partial Power Converters (PPCs) offer high efficiency by processing only a fraction of total power, yet multiport solutions remain limited. This article presents a multiport power converter (MPC) enabling coordinated integration of PV, battery, and DC microgrid ports in a 350 V system. The design employs a current-fed push-pull structure with decoupled port-control variables, enabling simultaneous MPPT for the PV port and droop regulation for the battery. A unified fast fault-protection scheme is introduced to handle short-circuit and open-circuit faults, supported by experimental validation under PV-side fault events. Furthermore, the article discusses the internal inrush currents that arise during mode transitions and outlines measures to prevent device overstress. Both simulation and hardware results validate the effectiveness of these strategies, demonstrating the suitability of the MPC for advanced DC microgrid applications.

This paper presents a proof of concept of a reconfigurable non-isolated DC-DC converter for connecting different energy sources and loads in a DC microgrid. Reconfigurable converters enhance redundancy, ease maintenance, and allow plug-and-play capability for converters for different power sources in DC microgrids. The proposed reconfigurable converter can operate as a unidirectional boost or buck converter or as a bidirectional converter. The proposed architectures offer the DC microgrid outstanding flexibility and can handle a variety of power flow circumstances effectively. Its bidirectional capacity enables a balanced and robust microgrid operation by facilitating energy exchange between battery storage systems and distributed loads. Simulation and experimental work confirm the effectiveness of the proposed converter in terms of dynamic response and justify the proof of concept of plug-and-play capability of the reconfigurable converter in the DC microgrid. This research highlights the converter's ability to meet the growing energy storage needs, renewable energy integration, and smart grid features, paving the way for scalable and environmentally friendly DC microgrid systems.

This manuscript investigates a sigma-delta–based cycle-skipping modulation strategy for power regulation and current sharing in modular series resonant DC transformers. The method enables continuous power control without changing the switching frequency, duty cycle, or phase shift, making it suitable for DC transformer architectures that normally operate in a load-independent manner. A modified cycle-skipping approach is introduced to maintain magnetizing current during idle intervals, thereby preserving soft switching across the full operating range. The sigma-delta modulator replaces the fixed burst patterns of traditional cycle skipping with a noise-shaped pulse distribution that improves control resolution and mitigates low-frequency ripple. A practical implementation on an STM32 microcontroller is presented, including a lookup-table-based mapping of the sigma-delta bitstream to hardware burst-mode registers. Experimental validation on a 1-kW SRC-DCX prototype confirms accurate power regulation. Later demonstrated that, when extended to a dual-module IPOP configuration, the method achieves effective current balancing, with a peak efficiency of nearly 98%.