All Outputs (23)

On Accelerated Degradation of DC-Link Film Capacitors and Data-based Lifetime Estimation (2024)
Journal Article
Pena-Quintal, A., Mustafa, U., Gerada, C., & Ahmed, M. R. (2024). On Accelerated Degradation of DC-Link Film Capacitors and Data-based Lifetime Estimation. IEEE Access, 12, 177565-177575. https://doi.org/10.1109/access.2024.3474256

Methods to address the lifetime of film capacitors are a new trend, which have come about due to the importance of control algorithms relying on the stability and the reliability of this passive device for controlling ever-increasing power with optim... Read More about On Accelerated Degradation of DC-Link Film Capacitors and Data-based Lifetime Estimation.

On Optimized Modulation Strategies for Electric Vehicle Integrated On-board Chargers (2024)
Journal Article
Kougioulis, I., Zanchetta, P., Wheeler, P., & Ahmed, M. R. (2025). On Optimized Modulation Strategies for Electric Vehicle Integrated On-board Chargers. IEEE Transactions on Industry Applications, 61(1), 714-725. https://doi.org/10.1109/TIA.2024.3463610

Integration of the on-board charger (OBC) and auxiliary power module (APM) in electric vehicles (EVs) can reduce the overall weight, volume and cost of the on-board charging system, as well as increase efficiency. This paper proposes optimized modula... Read More about On Optimized Modulation Strategies for Electric Vehicle Integrated On-board Chargers.

Design Analysis of High-Frequency, High Power 3-Phase DAB Transformer for Electric Vehicle Charger Applications (2024)
Presentation / Conference Contribution
Mustafa, U., Kougioulis, I., Watson, A. J., Wheeler, P., & Ahmed, M. R. (2024, June). Design Analysis of High-Frequency, High Power 3-Phase DAB Transformer for Electric Vehicle Charger Applications. Presented at 2024 IEEE Transportation Electrification Conference and Expo (ITEC), Chicago, IL, USA

The power requirements for onboard chargers in Electric Vehicles are increasing due to the need for increased charging speeds. The 3-Phase Dual Active Bridge (DAB) DC-DC converter is an enabling topology for high-power onboard chargers (22kW). Howeve... Read More about Design Analysis of High-Frequency, High Power 3-Phase DAB Transformer for Electric Vehicle Charger Applications.

Novel converter-dynamic voltage restorer integration to mitigate voltage sags (2024)
Presentation / Conference Contribution
Alwahaibi, S., Wheeler, P., Rivera, M., & Ahmed, R. (2024, June). Novel converter-dynamic voltage restorer integration to mitigate voltage sags. Presented at 13th International Conference on Power Electronics, Machines and Drives (PEMD 2024), Nottingham, England

Voltage sag is common power quality issue that disturb load operation and need attention. The Dynamic Voltage Restorer (DVR) is an effective solution for voltage sags compensation. However, the conventional DVR, consisting of a DC source and an inver... Read More about Novel converter-dynamic voltage restorer integration to mitigate voltage sags.

Analysis and Experimental Evaluation of a Soft Switching Boost Converter with Unbalanced Capacitor Voltage (2024)
Journal Article
Chen, Q., Klumpner, C., Li, Y., & Ahmed, M. R. (2024). Analysis and Experimental Evaluation of a Soft Switching Boost Converter with Unbalanced Capacitor Voltage. IEEE Transactions on Power Electronics, 39(9), 11176 - 11186. https://doi.org/10.1109/TPEL.2024.3404260

This paper presents a novel unbalanced capacitor voltage (UCV) soft switching boost converter under full loads range with a simple control scheme. The topology consists of a half bridge switching-leg, filter inductor, and an auxiliary circuit contain... Read More about Analysis and Experimental Evaluation of a Soft Switching Boost Converter with Unbalanced Capacitor Voltage.

An Unbalanced Capacitor Voltage Buck Converter With Wide Soft Switching Range (2023)
Journal Article
Chen, Q., Klumpner, C., & Ahmed, M. R. (2023). An Unbalanced Capacitor Voltage Buck Converter With Wide Soft Switching Range. IEEE Transactions on Industrial Electronics, 71(8), 8703-8713. https://doi.org/10.1109/tie.2023.3314856

DC–DC converters using soft switching technology have gained popularity in several industrial applications. Nevertheless, a wider soft switching range and a simpler structure are the holy grail for these converters. In this article, an innovative unb... Read More about An Unbalanced Capacitor Voltage Buck Converter With Wide Soft Switching Range.

Estimation of Leakage Inductance in High-frequency Three-Winding Transformers for Electric Vehicle On-board Chargers (2023)
Presentation / Conference Contribution
Kougioulis, I., Vannini, A., Pal, A., Wheeler, P., & Ahmed, M. R. (2023, September). Estimation of Leakage Inductance in High-frequency Three-Winding Transformers for Electric Vehicle On-board Chargers. Presented at 25th European Conference on Power Electronics and Applications: EPE’23 ECCE Europe, Aalborg, Denmark

This paper reviews several methods to estimate the equivalent circuit model parameters of high-frequency three-winding transformers, considering measurement accuracy and tolerance to measurement errors. First, several equivalent circuit models of the... Read More about Estimation of Leakage Inductance in High-frequency Three-Winding Transformers for Electric Vehicle On-board Chargers.

Impact of Grid Unbalances on Electric Vehicle Chargers (2023)
Journal Article
Alwahaibi, S., Wheeler, P., Rivera, M., & Ahmed, M. R. (2023). Impact of Grid Unbalances on Electric Vehicle Chargers. Energies, 16(17), Article 6201. https://doi.org/10.3390/en16176201

There is a global trend to reduce emissions from cars through the adoption of other alternatives, such as electric vehicles (EVs). The increasing popularity of EVs has led to a growing demand for electric vehicle chargers. EV chargers are essential f... Read More about Impact of Grid Unbalances on Electric Vehicle Chargers.

An Optimisation Tool for Hybrid-Electric Aircraft Propulsion Systems (2023)
Presentation / Conference Contribution
Walmsley, R., Ahmed, R., Klumpner, C., & Saleh, B. M. (2023, May). An Optimisation Tool for Hybrid-Electric Aircraft Propulsion Systems. Presented at IEEE International Electric Machines & Drives Conference (IEMDC 2023), San Francisco, CA, USA

The requirement for reductions in CO 2 , NO X and noise emissions from aviation have come under great assiduity. The use of electric and hybrid-electric propulsion systems within aircraft offer potential performance and efficiency improvements, throu... Read More about An Optimisation Tool for Hybrid-Electric Aircraft Propulsion Systems.

An Isolated Multiport DC–DC Converter for Integrated Electric Vehicle On-Board Charger (2023)
Journal Article
Kougioulis, I., Pal, A., Wheeler, P., & Ahmed, M. R. (2023). An Isolated Multiport DC–DC Converter for Integrated Electric Vehicle On-Board Charger. IEEE Journal of Emerging and Selected Topics in Power Electronics, 11(4), 4178-4198. https://doi.org/10.1109/jestpe.2023.3276048

This paper proposes an integrated on-board charger (IOBC) for Electric Vehicles (EVs) based on an isolated three-port DC-DC converter. The proposed architecture integrates the on-board charger (OBC) and the auxiliary power module (APM) in a single mu... Read More about An Isolated Multiport DC–DC Converter for Integrated Electric Vehicle On-Board Charger.

A comprehensive review of machine-integrated electric vehicle chargers (2022)
Journal Article
Mustafa, U., Ahmed, R., Watson, A., Wheeler, P., Ahmed, N., & Dahele, P. (2022). A comprehensive review of machine-integrated electric vehicle chargers. Energies, 16(1), Article 129. https://doi.org/10.3390/en16010129

Electric Vehicles are becoming increasingly popular due to their environment friendly operation. As the demand for electric vehicles increases, it has become quite important to explore their charging strategies. Since charging and traction do not nor... Read More about A comprehensive review of machine-integrated electric vehicle chargers.

A Critical Review on Charging Technologies of Electric Vehicles (2022)
Journal Article
Shahjalal, M., Shams, T., Tasnim, M. N., Ahmed, M. R., Ahsan, M., & Haider, J. (2022). A Critical Review on Charging Technologies of Electric Vehicles. Energies, 15(21), Article 8239. https://doi.org/10.3390/en15218239

The enormous number of automobiles across the world has caused a significant increase in emissions of greenhouse gases, which pose a grave and mounting threat to modern life by escalating global warming and polluting air quality. These adverse effect... Read More about A Critical Review on Charging Technologies of Electric Vehicles.

New approach for comparing Modular Multilevel Converter submodule losses considering IGBT and SiC MOSFET devices (2022)
Presentation / Conference Contribution
Guicharrousse, P., Rishad Ahmed, M., Wheeler, P., & Zanchetta, P. (2022, October). New approach for comparing Modular Multilevel Converter submodule losses considering IGBT and SiC MOSFET devices. Presented at IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society, Brussels, Belgium

Submodule losses for Modular Multilevel Converter (MMC) are frequently inferred based only on the number of components. This procedure lacks support because Submodule losses also depend on other conditions. In this work, the simulation of different S... Read More about New approach for comparing Modular Multilevel Converter submodule losses considering IGBT and SiC MOSFET devices.

A Numerical Thermal Analysis of a Battery Pack in an Electric Motorbike Application (2022)
Journal Article
Shahjalal, M., Shams, T., Hossain, S. B., Roy, P. K., Jion, A. A., Ahsan, M., Chowdhury, J. I., Ahmed, M. R., Alam, S. B., & Haider, J. (2022). A Numerical Thermal Analysis of a Battery Pack in an Electric Motorbike Application. Designs, 6(4), Article 60. https://doi.org/10.3390/designs6040060

Today, electric driven motorbikes (e-motorbikes) are facing multiple safety, functionality and operating challenges, particularly in hot climatic conditions. One of them is the increasing demand for efficient battery cooling to avoid the potential th... Read More about A Numerical Thermal Analysis of a Battery Pack in an Electric Motorbike Application.

A review on second-life of Li-ion batteries: prospects, challenges, and issues (2021)
Journal Article
Shahjalal, M., Roy, P. K., Shams, T., Fly, A., Chowdhury, J. I., Ahmed, M. R., & Liu, K. (2022). A review on second-life of Li-ion batteries: prospects, challenges, and issues. Energy, 241, Article 122881. https://doi.org/10.1016/j.energy.2021.122881

High energy density has made Li-ion battery become a reliable energy storage technology for transport-grid applications. Safely disposing batteries that below 80% of their nominal capacity is a matter of great concern to reduce overall carbon footpri... Read More about A review on second-life of Li-ion batteries: prospects, challenges, and issues.

A comprehensive review on system architecture and international standards for electric vehicle charging stations (2021)
Journal Article
Rajendran, G., Vaithilingam, C. A., Misron, N., Naidu, K., & Ahmed, M. R. (2021). A comprehensive review on system architecture and international standards for electric vehicle charging stations. Journal of Energy Storage, 42, Article 103099. https://doi.org/10.1016/j.est.2021.103099

Electric Vehicles (EVs) are rapidly becoming an important facet in the drive for attaining sustainable energy goals. However, EV sales still constitute only a small proportion of vehicles in most countries. The expansion of DC fast-charging network w... Read More about A comprehensive review on system architecture and international standards for electric vehicle charging stations.

A review of thermal management for Li-ion batteries: Prospects, challenges, and issues (2021)
Journal Article
Shahjalal, M., Shams, T., Islam, M. E., Alam, W., Modak, M., Hossain, S. B., Ramadesigan, V., Ahmed, M. R., Ahmed, H., & Iqbal, A. (2021). A review of thermal management for Li-ion batteries: Prospects, challenges, and issues. Journal of Energy Storage, 39, Article 102518. https://doi.org/10.1016/j.est.2021.102518

Li-ion batteries are essential component in the current generation of electric vehicles. However, further pushing electric vehicles are concerned with battery life. Since the temperature dictates battery lifetime, it is crucial to manage the heat and... Read More about A review of thermal management for Li-ion batteries: Prospects, challenges, and issues.

Voltage Oriented Controller based Vienna Rectifier for Electric Vehicle Charging Stations (2021)
Journal Article
Rajendran, G., Vaithilingam, C. A., Misron, N., Naidu, K., & Ahmed, M. R. (2021). Voltage Oriented Controller based Vienna Rectifier for Electric Vehicle Charging Stations. IEEE Access, 9, 50798-50809. https://doi.org/10.1109/ACCESS.2021.3068653

Vienna rectifiers have gained popularity in recent years for AC to DC power conversion for many industrial applications such as welding power supplies, data centers, telecommunication power sources, aircraft systems, and electric vehicle charging sta... Read More about Voltage Oriented Controller based Vienna Rectifier for Electric Vehicle Charging Stations.

An Analysis of the Thermal Interaction Between Components in Power Converter Applications (2020)
Journal Article
Shahjalal, M., Ahmed, M. R., Lu, H., Bailey, C., & Forsyth, A. J. (2020). An Analysis of the Thermal Interaction Between Components in Power Converter Applications. IEEE Transactions on Power Electronics, 35(9), 9082-9094. https://doi.org/10.1109/tpel.2020.2969350

Accurately predicting the temperature of semiconductor devices is very important in the initial design of the power electronics converter. RC thermal models derived from the well-known methods have some ability to predict the temperature. However, th... Read More about An Analysis of the Thermal Interaction Between Components in Power Converter Applications.

A Single- and Three-Phase Grid Compatible Converter for Electric Vehicle On-Board Chargers (2019)
Journal Article
Zhao, H., Shen, Y., Ying, W., Ghosh, S. S., Ahmed, M. R., & Long, T. (2020). A Single- and Three-Phase Grid Compatible Converter for Electric Vehicle On-Board Chargers. IEEE Transactions on Power Electronics, 35(7), 7545-7562. https://doi.org/10.1109/tpel.2019.2956653

This article proposes a voltage-source converter for an on-board electric vehicle charger, which is compatible with both the single- and three-phase (1-Φ and 3-Φ) grids. The classic 3-Φ active ac-dc rectifier circuit is used for both the 1-Φ and 3-Φ... Read More about A Single- and Three-Phase Grid Compatible Converter for Electric Vehicle On-Board Chargers.