All Outputs (28)

Silicon Carbide n-IGBTs: Structure Optimization for Ruggedness Enhancement (2024)
Journal Article
Almpanis, I., Antoniou, M., Evans, P., Empringham, L., Gammon, P., Undrea, F., …Lophitis, N. (2024). Silicon Carbide n-IGBTs: Structure Optimization for Ruggedness Enhancement. IEEE Transactions on Industry Applications, 60(3), 4251-4263. https://doi.org/10.1109/tia.2024.3354870

In recent years, silicon carbide (SiC) based devices are increasingly replacing their silicon counterparts in power conversion applications due to their performance superiority. SiC insulated-gate bipolar transistors are particularly interesting as t... Read More about Silicon Carbide n-IGBTs: Structure Optimization for Ruggedness Enhancement.

10kV+ Rated SiC n-IGBTs: Novel Collector-Side Design Approach Breaking the Trade-Off between dV/dt and Device Efficiency (2023)
Journal Article
Almpanis, I., Evans, P., Antoniou, M., Gammon, P., Empringham, L., Undrea, F., …Lophitis, N. (2023). 10kV+ Rated SiC n-IGBTs: Novel Collector-Side Design Approach Breaking the Trade-Off between dV/dt and Device Efficiency. Key Engineering Materials, 946, 125-133. https://doi.org/10.4028/p-21h5lt

10kV+ rated 4H- Silicon Carbide (SiC) Insulated Gate Bipolar Transistors (IGBTs) have the potential to become the devices of choice in future Medium Voltage (MV) and High Voltage (HV) power converters. However, one significant performance concern of... Read More about 10kV+ Rated SiC n-IGBTs: Novel Collector-Side Design Approach Breaking the Trade-Off between dV/dt and Device Efficiency.

Matrix converter open circuit fault behavior analysis and diagnosis with a model predictive control strategy (2018)
Journal Article
Zhang, J., Dan, H., Empringham, L., De Lillo, L., & Wheeler, P. (2018). Matrix converter open circuit fault behavior analysis and diagnosis with a model predictive control strategy. IEEE Journal of Emerging and Selected Topics in Power Electronics, 6(4), 1831-1839. https://doi.org/10.1109/jestpe.2018.2856460

A novel fast and reliable open circuit fault diagnosis strategy for a Matrix Converter with a Finite Control Set Model Predictive Control strategy is proposed in this paper. Current sensors are located ahead of the clamp circuit to measure the output... Read More about Matrix converter open circuit fault behavior analysis and diagnosis with a model predictive control strategy.

IEEE ITRW working group position paper: packaging and integration: unlocking the full potential of wide-bandgap devices (2018)
Journal Article
Johnson, M., Wilson, P. R., Empringham, L., & De Lillo, L. (2018). IEEE ITRW working group position paper: packaging and integration: unlocking the full potential of wide-bandgap devices. IEEE Power Electronics Magazine, 5(2), 26-33. https://doi.org/10.1109/mpel.2018.2822246

The International Technology Roadmap for Wide-Bandgap Power Semiconductors (ITRW) has four distinct technical working groups, each providing its own perspective on the technology and industrial drivers for the adoption of wide-bandgap (WBG) power sem... Read More about IEEE ITRW working group position paper: packaging and integration: unlocking the full potential of wide-bandgap devices.

Direct predictive current-error vector control for a direct matrix converter (2018)
Journal Article
Vijayagopal, M., Silva, C. A., Empringham, L., & De Lillo, L. (2019). Direct predictive current-error vector control for a direct matrix converter. IEEE Transactions on Power Electronics, 34(2), 1925-1935. https://doi.org/10.1109/TPEL.2018.2833495

This paper proposes a novel control strategy for matrix converters which is coined “Direct Predictive Current-error Vector Control”. The proposed control method retains the advantageous features of both a modulation scheme and of a predictive based c... Read More about Direct predictive current-error vector control for a direct matrix converter.

Matrix converter open circuit fault diagnosis with asymmetric one zero SVM (2017)
Presentation / Conference Contribution
Zhang, J., Empringham, L., De Lillo, L., Dan, H., & Wheeler, P. (2017). Matrix converter open circuit fault diagnosis with asymmetric one zero SVM.

An open-circuit fault detection and diagnosis strategy for a direct matrix converter is proposed in this paper. The current recirculating path during an open circuit condition is considered in detail with the aim of contributing more expert knowledge... Read More about Matrix converter open circuit fault diagnosis with asymmetric one zero SVM.

Differential buck single phase grid connected AC-DC converter with active power decoupling using a flipping Capacitor (2017)
Presentation / Conference Contribution
Gottardo, D., De Lillo, L., Empringham, L., & Costabeber, A. (2017). Differential buck single phase grid connected AC-DC converter with active power decoupling using a flipping Capacitor.

This paper introduces a new single-phase AC-DC converter capable of achieving independent voltage control across a dedicated power decoupling capacitor, by exploiting the same full bridge that controls the grid current in combination with two bidirec... Read More about Differential buck single phase grid connected AC-DC converter with active power decoupling using a flipping Capacitor.

A low capacitance single-phase AC-DC converter with inherent power ripple decoupling (2016)
Presentation / Conference Contribution
Gottardo, D., De Lillo, L., Empringham, L., & Costabeber, A. (2016). A low capacitance single-phase AC-DC converter with inherent power ripple decoupling.

This paper proposes a new single-phase AC-DC conversion topology with inherent power ripple decoupling, based on the combination of a PWM H-bridge inverter, an AC side LC filter and a ZVS line commutated H-bridge. A capacitor on the AC side is used a... Read More about A low capacitance single-phase AC-DC converter with inherent power ripple decoupling.

Experimental comparison of devices thermal cycling in direct matrix converters (DMC) and Indirect Matrix Converters (IMC) using SiC MOSFETs (2016)
Presentation / Conference Contribution
Trentin, A., Zanchetta, P., Empringham, L., De Lillo, L., Wheeler, P., & Clare, J. C. (2016). Experimental comparison of devices thermal cycling in direct matrix converters (DMC) and Indirect Matrix Converters (IMC) using SiC MOSFETs.

This paper presents an experimental comparison between a Direct Matrix Converter and an Indirect Matrix Converter in terms of semiconductor devices thermal cycling. Both converters have been designed and built using SiC MOSFETs; the Indirect Matrix C... Read More about Experimental comparison of devices thermal cycling in direct matrix converters (DMC) and Indirect Matrix Converters (IMC) using SiC MOSFETs.

Efficiency evaluation of fully integrated on-board EV battery chargers With nine-phase machines (2016)
Journal Article
Bodo, N., Levi, E., Subotic, I., Espina, J., Empringham, L., & Johnson, C. M. (2016). Efficiency evaluation of fully integrated on-board EV battery chargers With nine-phase machines. IEEE Transactions on Energy Conversion, 32(1), 257-266. https://doi.org/10.1109/TEC.2016.2606657

A fully integrated on-board battery charger for future electric vehicles (EVs) has been recently introduced. It reutilizes all the propulsion components of an EV in charging/vehicle-to-grid (V2G) modes, it does not require any additional components o... Read More about Efficiency evaluation of fully integrated on-board EV battery chargers With nine-phase machines.

Experimental efficiency comparison between a direct matrix converter and an indirect matrix converter using both Si IGBTs and SiC MOSFETs (2016)
Journal Article
Trentin, A., Liliana de Lillio, L., Empringham, L., Zanchetta, P., Wheeler, P., & Clare, J. C. (2016). Experimental efficiency comparison between a direct matrix converter and an indirect matrix converter using both Si IGBTs and SiC MOSFETs. IEEE Transactions on Industry Applications, 52(5), 4135-4145. https://doi.org/10.1109/TIA.2016.2573752

This paper presents an experimental efficiency comparison study between two different direct AC-AC converter topologies: a direct matrix converter (DMC) and an indirect matrix converter (IMC). The evaluation is performed under variable load condition... Read More about Experimental efficiency comparison between a direct matrix converter and an indirect matrix converter using both Si IGBTs and SiC MOSFETs.

A hybrid control method to suppress the three time fundamental frequency neutral-point voltage fluctuation in a VIENNA rectifier (2015)
Journal Article
Song, W.-Z., Xing, F.-X., Yang, H., Empringham, L., De Lillo, L., Wheeler, P., Li, J., & Zhong, Y.-R. (2015). A hybrid control method to suppress the three time fundamental frequency neutral-point voltage fluctuation in a VIENNA rectifier. IEEE Journal of Emerging and Selected Topics in Power Electronics, 4(2), https://doi.org/10.1109/JESTPE.2015.2503125

This paper presents a solution to the control of the three times fundamental frequency fluctuation of the neutral-point in a VIENNA rectifier. A hybrid method combining a dynamic adjustment factor with a voltage deviation control of the split DC-link... Read More about A hybrid control method to suppress the three time fundamental frequency neutral-point voltage fluctuation in a VIENNA rectifier.

Short-circuit fault analysis and isolation strategy for matrix converters (2015)
Journal Article
Wang, L.-N., De Lillo, L., Brunson, C., Empringham, L., & Wheeler, P. (in press). Short-circuit fault analysis and isolation strategy for matrix converters. Journal of Central South University of Technology, 22(9), https://doi.org/10.1007/s11771-015-2886-y

The behavior of matrix converter (MC) drive systems under the condition of MC short-circuit faults is comprehensively investigated. Two isolation strategies using semiconductors and high speed fuses (HSFs) for MC short-circuit faults are examined and... Read More about Short-circuit fault analysis and isolation strategy for matrix converters.

Experimental comparison of a matrix converter using Si IGBT and SiC MOSFETs (2015)
Journal Article
Trentin, A., De Lillo, L., Empringham, L., Wheeler, P., & Clare, J. C. (2015). Experimental comparison of a matrix converter using Si IGBT and SiC MOSFETs. IEEE Journal of Emerging and Selected Topics in Power Electronics, 3(2), https://doi.org/10.1109/JESTPE.2014.2381001

This paper presents an analytical and experimental comparison between comparable Silicon (Si) IGBTs and Silicon Carbide (SiC) MOSFETS when used in a direct AC/AC matrix converter circuit. The switching performance of the two devices is analysed and t... Read More about Experimental comparison of a matrix converter using Si IGBT and SiC MOSFETs.

A four-legs matrix converter ground power unit with repetitive voltage control (2014)
Journal Article
Rohuma, W., Zanchetta, P., Wheeler, P., & Empringham, L. (2015). A four-legs matrix converter ground power unit with repetitive voltage control. IEEE Transactions on Industrial Electronics, 62(4), https://doi.org/10.1109/TIE.2014.2379585

In this paper, a four-leg matrix converter is proposed as the power conversion core for aircraft ground power unit (GPU) applications. This structure allows easy management of unbalanced and nonlinear loads with minimal disruption of the power supply... Read More about A four-legs matrix converter ground power unit with repetitive voltage control.

Open circuit fault detection and diagnosis in matrix converters (2014)
Journal Article
Brunson, C., Empringham, L., De Lillo, L., Wheeler, P., & Clare, J. C. (2014). Open circuit fault detection and diagnosis in matrix converters. IEEE Transactions on Power Electronics, 30(5), https://doi.org/10.1109/TPEL.2014.2364152

With the increased use of power electronics in aerospace, automotive, industrial, and energy generation sectors, the demand for highly reliable and power dense solutions has increased. Matrix converters become attractive when taking into account dema... Read More about Open circuit fault detection and diagnosis in matrix converters.

Reduction of output common mode voltage using a novel SVM implementation in matrix converters for improved motor lifetime (2014)
Journal Article
Espina, J., Ortega, C., De Lillo, L., Empringham, L., Balcells, J., & Arias, A. (2014). Reduction of output common mode voltage using a novel SVM implementation in matrix converters for improved motor lifetime. IEEE Transactions on Industrial Electronics, 61(11), https://doi.org/10.1109/TIE.2014.2304931

This paper presents the study of an alternative Space Vector Modulation (SVM) implementation for Matrix Converters (MC) which reduces the output Common Mode (CM) voltage. The strategy is based on replacing the MC zero vectors by the rotating ones. In... Read More about Reduction of output common mode voltage using a novel SVM implementation in matrix converters for improved motor lifetime.

Design challenges in the use of silicon carbide JFETs in matrix converter applications (2013)
Journal Article
Empringham, L., De Lillo, L., & Shulz, M. (2013). Design challenges in the use of silicon carbide JFETs in matrix converter applications. IEEE Transactions on Power Electronics, 29(5), https://doi.org/10.1109/TPEL.2013.2290835

This paper investigates some of the challenges en¬countered during the implementation of a Silicon Carbide JFET matrix converter which has been designed to meet a specific power density of 20kW/litre with forced air cooling. After a brief introductio... Read More about Design challenges in the use of silicon carbide JFETs in matrix converter applications.

HF induction motor modeling using Genetic Algorithms and experimental impedance measurement (2010)
Presentation / Conference Contribution
Degano, M., Zanchetta, P., Clare, J., & Empringham, L. (2010). HF induction motor modeling using Genetic Algorithms and experimental impedance measurement. . https://doi.org/10.1109/ISIE.2010.5637052

High frequency (HF) models of electrical motors and converters are of basic importance for Electro Magnetic Compatibility (EMC) characterization of electrical drives and for EMI filters design. In this paper a method for characterizing and tuning HF... Read More about HF induction motor modeling using Genetic Algorithms and experimental impedance measurement.

Design and testing of electromechanical actuator for aerospace applications
Presentation / Conference Contribution
Papini, L., Connor, P., Patel, C., Empringham, L., Gerada, C., & Wheeler, P. (2018, January). Design and testing of electromechanical actuator for aerospace applications. Presented at 2018 25th International Workshop on Electric Drives: Optimization in Control of Electric Drives (IWED), Moscow, Russia

Electromechanical actuators are gaining interest in the aerospace industry within the More Electrical Aircraft (MEA) architecture. The end-goal of fully electric aircraft includes Electromechanical actuation for flight control systems. The design and... Read More about Design and testing of electromechanical actuator for aerospace applications.