Browsing by Author "Ur Rehman, M.B."

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Comparative Study on Efficiency and Output Voltage Regulation in Dual-Active Bridge Converter with SPS and TPS Modulation under Input Voltage Variations
(Institute of Electrical and Electronics Engineers Inc., 2024) Ur Rehman, M.B.; Ilamparithi, T.; Nagendrappa, H.
The comprehensive performance characteristics of two prominent modulation techniques on Dual-Active Bridge (DAB) converter: Single Phase Shift (SPS) and Triple Phase Shift (TPS) is presented in this paper. The DAB converter topology is a promising architecture for its high-efficiency, bidirectional power conversion, galvanic isolation and flexible gating schemes. The primary objective is to evaluate the effectiveness of modulation techniques on output voltage regulation under varying input voltage conditions. Phase displacement patterns and their correlation with the varying input voltage are illustrated graphically along with the detailed results. A comprehensive design analysis is developed, followed by the detailed simulation results is showcased for a 1 kW converter in boost mode of operation. This study highlights the insights for the selection and optimization of modulation strategies for DAB converter in applications demanding precise output voltage regulation and high efficiency. Â© 2024 IEEE.
Fixed-frequency modified gating signals controlled high-frequency isolated LCL-T DC-DC resonant power converter
(Taylor and Francis Ltd., 2025) Reddy, V.B.; Ur Rehman, M.B.; Srinivas, B.; Nagendrappa, N.
In this paper, a fixed-frequency modified gating signals controlled LCL-T type of resonant power converter is proposed. The converter is designed to operate in lagging power factor (pf) mode to ensure zero-voltage switching (ZVS) of the inverter switches. Steady-state analysis of the converter is carried out using the Fourier series approach by considering the effect of n-harmonics. A 300 W converter is designed, and its performance is studied using PSIM simulations. It is shown that all inverter switches turn-on with ZVS for entire loading conditions with the minimum input voltage, while only one switch loses ZVS when the input voltage is maximum. Also, a small change in pulse width is enough to regulate the output voltage for wide variations in the input voltage and the load. Power loss breakdown analysis is performed. The experimental prototype of the LCL-T resonant converter is built and tested to validate the theoretical and simulation results. The results have been compared and discussed. © 2024 Informa UK Limited, trading as Taylor & Francis Group.
Performance Comparison of Dual Active Bridge Conventional and Dual Active Bridge CLLC Resonant Converter
(Institute of Electrical and Electronics Engineers Inc., 2024) Afridi, S.; Ur Rehman, M.B.; Nagendrappa, H.
This paper presents a comparative analysis of the performance between dual active bridge (DAB) conventional converter and dual active bridge CLLC resonant converter for energy storage applications. The DAB resonant converter topology has gained significant attention due to its high efficiency, reduced size, and improved reliability compared to conventional converter topologies. In this paper, the performances of DAB conventional converter and DAB CLLC resonant converter on same control and modulation technique under various operating load have been evaluated. The study focuses on design of converters for an output power of 500 W, an input DC link voltage of 200 V, and an output voltage range of 60-84 V. Â© 2024 IEEE.