SummaryFuture power electronics is moving towards compact, economical, feasible, and reliable inverters for integration with renewable energy sources and energy efficient drive schemes. Multilevel inverters (MLIs) are becoming more prominent candidates for such medium and high power applications. Though their attractive performance offers a better choice, the real time implementation of MLIs suffer with higher part count, compatibility of bidirectional switches, complementary conditions, number of transitions, polarity conversion module, and reliability. In order to bridge this gap, this work has come up with a new seven level symmetric MLI for utility applications. The abovementioned design parameters have been considered in the proposed MLI that promotes feasible and reliable operation for real time implementation. To defend this proposed topology, recent symmetric seven level MLI topologies have been compared and the results are compiled from constructional, operational, and performance aspects using Matlab/SIMULINK. The performance indices quantified for the analysis include part count, total harmonic distortion (THD), complementary conditions, number of transitions, polarity conversion module, switching losses, and reliability in terms of failure rate. The proposed topology has been validated through real time hardware implementation in which Atmega 2560 microprocessor is deployed for pulse generation.

Intermediate Bus Architecture (IBA) is used for power distribution in information communication technology (ICT) equipment due to the flexibility of its power distribution and cost-effectiveness compared to centralized or DC-mediated power. The reason for IBA's good performance in this context is its greater reliability and efficient Intermediate Bus Converter (IBC). Existing IBAs comprise low-voltage systems with multiple power, resulting in power loss. This study outlines the need for a high-voltage DC-to-DC converter to solve the problems associated with conventional 48 VDC converters. A 300 W LLC series resonant converter is utilized for the design and analysis of converter efficiency and losses across various input voltages. The results indicate that the maximum converter efficiency is >92% at full load. MATHCAD is used to analyze the performance of the LLC converter and understand the suitable operating zones for zero-voltage-switching. The LLC converter's efficiency is investigated for multiple input voltage ranges. The LLC converter is designed and developed in MATLAB and the results of the simulation are presented. Trade-offs in the LLC converter's design are also discussed, with the goal of operating the converter in an optimal manner and achieving the maximum possible efficiency.

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