Article
Engineering, Electrical & Electronic
Gerard Delette, Ulrich Soupremanien, Serge Loudot
Summary: This article presents a methodology for designing compact transformers that operate at high frequencies, with an emphasis on thermal management of the magnetic core and winding components. The objective is to reduce core volume, improve power efficiency, and integrate the serial inductance as the leakage inductance of the transformer. A parametric study reveals the sensitivity of copper winding heating to the anisotropic thermal conduction behavior of the wire. By inserting internal thermal drains into specially designed voids, the heating of internal components and resulting thermo-mechanical stress peak can be reduced, paving the way for robust transformers with high power density.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Gabriele Ulissi, Umamaheswara Reddy Vemulapati, Thomas Stiasny, Drazen Dujic
Summary: This article explores the operational performances of series-connected IGCTs in medium-voltage dc-dc resonant converters. The study focuses on low turn-off currents and voltage sharing within a specific range of snubber capacitance. The results demonstrate successful series connection of IGCTs at 5 kHz.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Jung-Soo Bae, Tae-Hyun Kim, Seong-Ho Son, Hyoung-Suk Kim, Chan-Hun Yu, Sung-Roc Jang
Summary: This letter proposes a high output voltage dc-dc converter topology with series stacked converter modules, focusing on output voltage balancing and simplification of the control circuitry as major design objectives. A split-secondary transformer winding structure and distributed connections to the rectifier circuit blocks are proposed to achieve voltage balancing between the modules. This method was verified using a modular LCC resonant converter, simplifying the control circuit by using a single controller and a compact sensing circuit.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Chemistry, Analytical
Daniela Rodriguez-Sotelo, Martin A. Rodriguez-Licea, Ismael Araujo-Vargas, Juan Prado-Olivarez, Alejandro-Israel Barranco-Gutierrez, Francisco J. Perez-Pinal
Summary: This article highlights the importance and challenges of magnetic components in power electronics, and proposes the use of ferromagnetic materials as substitutes for ferrite in the core of magnetic components. The main focus of the article is on the latest techniques and applications of core losses models, providing tools and techniques for magnetic solutions in miniaturization applications.
Article
Engineering, Electrical & Electronic
Cailing Huo, Youhua Wang, Chengcheng Liu, Gang Lei
Summary: This study proposes a residual flux density measurement method for power transformer cores based on magnetising inductance, which is verified through experiments and shown to have higher accuracy compared to widely used voltage integration methods.
IET ELECTRIC POWER APPLICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Declan Jordan, Guannan Wei, Liang Ye, Daniel Lordan, Pranay Podder, Ansar Masood, Kenneth Rodgers, Cian O. Mathuna, Paul McCloskey
Summary: This article explores a novel method of integrating multilayer thin film magnetics in PCBs for Power Supply in a Package (PwrSip) applications. The solenoid inductor structure uses a multilayer CZTB magnetic sheet and achieves low R-dc values. Furthermore, the fabricated flip-chip inductor demonstrates a peak quality factor of 23 at 40 MHz.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Multidisciplinary
Yuki Itogawa, Takeshi Amimoto, Yuu Kawai, Kikuo Izumi
Summary: This study investigates the discontinuous operation modes of a high-frequency isolation circuit using zero-phase current of a three-phase transformer. The circuit controls the power transmitted between primary and secondary bus bars by adjusting the phase difference of the output voltages. By adjusting the primary bus bar voltage, the circuit can regulate the current flowing through the three-phase transformer and achieve soft switching to minimize conduction loss. The proposed circuit scheme improves power-grid efficiency for renewable energy utilization and contributes to the realization of a sustainable society.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Keyao Sun, Yue Xu, Jun Wang, Rolando Burgos, Dushan Boroyevich
Summary: The auxiliary power supply (APS) is critical for medium voltage converters, and insulation design is a key challenge, as partial discharge can lead to system failures. Therefore, a PD-free APS system is required for reliability. Wireless power transfer (WPT) technology is attractive due to its insulation capability, and experimental validation shows its reliability.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Jun Beom Pyo, Xuan Wang, Minsoo Kim, Hanju Oh, Robert Kauffman, Mark G. G. Allen
Summary: Metallic magnetic alloys are attracting attention as core materials in ultracompact or integrated inductors and transformers. To suppress eddy current loss at high frequencies, a multilayer stack of magnetic material laminations and electrically insulating interlayers is required. The use of polypyrrole as an interlayer material in sequential multilayer electrodeposition has been investigated and shown effective in suppressing eddy current loss.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Tao Meng, Hongqi Ben, Chunyan Li, Fengjiang Wu
Summary: This study focused on input-series converters based on integrated-transformers and investigated the impact of winding arrangements on stray capacitance effects. The design effectiveness of integrated-transformer was verified through theoretical analysis and experimental study.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Vadim Sidorov, Andrii Chub, Dmitri Vinnikov
Summary: This article describes a proposed isolated buck-boost series resonant dc-dc converter with topology morphing control. The converter operates in six different modes and is capable of bidirectional operation. Experimental results confirm the theoretical expressions for the converter's dc voltage gain.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Haiwang Li, Kaiyun Zhu, Kaibo Lei, Tiantong Xu, Hanxiao Wu
Summary: This study presents a through-silicon via high-aspect-ratio toroidal transformer manufactured using microelectro-mechanical systems and electroplating. By wrapping a 1.2 mm high toroidal Ni-Zn ferrite core in silicon, a compact transformer with excellent performance in a high frequency range is achieved.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Olympio Cipriano da Silva, Fernando Lessa Tofoli, Peter Zacharias, Demercil de Souza Oliveira
Summary: This paper introduces a magnetic integration approach to reduce the number of individual cores required by an isolated symmetrical full-bridge converter. Through the derived design methodology based on the gyrator concept, only two cores will be required instead, resulting in reduced dimensions. The proposed solution leads to improved performance in terms of component count, volume, and efficiency compared to the counterpart that uses individual elements.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Manmath Kumar Badapanda, Akhilesh Tripathi, Rinki Upadhyay, Mahendra Lad
Summary: This is a modular 36 kV, 24 A crowbarless dc power supply used for biasing high power RF amplifiers. It has a control system with both feed-forward and feedback control for fine regulation of its output voltage. It also incorporates an optimized control strategy for ripple-free output and active redundancy for improved reliability.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Jose Luis Rodriguez-Amenedo, Santiago Arnaltes Gomez
Summary: The increasing integration of renewable energy in power systems has raised concerns about system stability. This paper proposes two novel power stabilizers for damping low-frequency oscillations in the power system, using active power and reactive power to achieve this goal.
Article
Energy & Fuels
Kankana Paul, Andreas Amann, Saibal Roy
Summary: This study introduces a high power density nonlinear wideband energy harvester using novel tapered spring architectures, providing a sustainable energy source for the Internet of Things applications.
Article
Materials Science, Multidisciplinary
Darragh Cronin, M. Hardiman, D. Lordan, G. Wei, P. McCloskey, C. O'Mathuna, A. Masood
Summary: This study focuses on the influence of residual stress on in-plane uniaxial magnetic anisotropy in amorphous films, showing that tensile stress undermines soft magnetic performance. It is suggested that sources of tensile stress should be avoided during the fabrication or post-processing of amorphous films to retain magnetic softness.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Daniel C. Smallwood, Paul McCloskey, Cian O'Mathuna, Declan P. Casey, James F. Rohan
Summary: This paper introduces a new photolithography technique that utilizes photochemical reactions and diffraction effects to determine VIA latent images, suitable for broad-spectrum exposure systems without the need for complex in situ measurements. Through comparative studies, it has been shown that this technique displays a high correlation between simulated geometries and experimental data.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Chemistry, Physical
Hasan Ahmadian Baghbaderani, Ansar Masood, Kenny L. Alvarez, Cian O. Mathuna, Paul McCloskey, Plamen Stamenov
Summary: By utilizing the CALPHAD method and topological instability parameters, the optimization of CoFeB alloys through in-situ nanocrystallization was achieved, leading to outstanding magnetic properties. The controlled local atomic ordering of nanocrystalline phases and element distribution differences were instrumental in enhancing the alloy performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Jaime Lopez Lopez, Pablo Zumel, Seamus O'Driscoll, Zoran Pavlovic, Ruaidhri Murphy, Cian O'Mathuna, Cristina Fernandez
Summary: This article presents a comprehensive design procedure for cored micro-inductors, allowing for the optimal device to be designed in a single iteration. It also helps designers easily determine the limits of the inductor in terms of handled current and losses, providing valuable physical insights into the process output.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Chandra Shetty, Youssef Kandeel, Liang Ye, Seamus O'Driscoll, Paul McCloskey, Maeve Duffy, Cian O. Mathuna
Summary: This work presents analytical expressions for the dc inductance of 3-D air-core inductors with different cross-sectional pillars and discusses the effects of high frequency on inductance. The proposed analytical models show good agreement with numerical analysis and measurement results, providing accurate predictions for various inductor structures.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Chemistry, Physical
Hasan Ahmadian Baghbaderani, Ansar Masood, Kenny L. Alvarez, Daniel Lordan, M. Venkatesan, Cian O. Mathuna, Paul McCloskey, Plamen Stamenov
Summary: In this study, the amorphisation capability of Co-Fe-B alloys fabricated by melt spinning is predicted and evaluated using liquidus temperature, mixing enthalpy, and atomic mismatch factor. The study successfully predicts five amorphous alloy compositions and finds a strong correlation between amorphisation ability and crystallisation behaviour.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Arindam Samanta, Saibal Roy
Summary: Researchers have developed a magnon microwave antenna that can generate microwaves with tunable frequencies. This is achieved by modulating confined spin waves in a patterned array of magnetostrictive nanomagnets/piezoelectric heterostructures using surface acoustic waves. The generated microwaves have a wide range of frequencies, from 0.56 GHz to 30 GHz, and can be used in various applications, including energy-efficient logic and low-power computing.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Youssef Kandeel, Seamus O'Driscoll, Cian O. Mathuna, Maeve Duffy
Summary: This article presents a new design procedure for fourth order and fourth-order resonance (4thRes) output filters, making component selection a straightforward process for given buck converter specifications. Accurate filter analysis is provided to predict the filter component currents and voltages in both frequency and time domains. Application of the analysis in a design study of a 20 MHz, 5.4 W buck converter shows that the 4thRes filter has the potential to reduce the output passive components for a wide duty cycle range. As compared with a second-order filter at V-IN = 6.6 V to V-OUT = 1.8 V, total inductance, inductor energy, capacitance, and capacitor energy are 58%, 35%, 45%, and 31% lower, respectively. Air-core printed circuit board (PCB) integrated solenoid inductors are considered for implementation and testing within a prototype converter to show the impact of these filters on the converter performance. The 4thRes filter achieved 3.7% and 3.6% higher full-load efficiency than the second- and fourth-order filters, respectively, and a better load transient performance.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Kankana Paul, Dinesh R. Gawade, Roy B. V. B. Simorangkir, Brendan O'Flynn, John L. Buckley, Andreas Amann, Saibal Roy
Summary: This article presents the design and fabrication of a resonant vibration energy harvester (VEH) that can provide a sustainable power source for wireless devices. The VEH has a compact size and high power density, and its feasibility in supporting near field communication (NFC)-based wireless sensor platforms is demonstrated. The study also shows that the VEH can enhance the wireless communication range for the NFC sensor nodes. This high-performance energy harvester-assisted NFC sensor node has the potential to be applied in various Internet of Things (IoT) platforms as an efficient power solution.
IEEE INTERNET OF THINGS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Youssef Kandeel, Seamus O'Driscoll, Cian O'Mathuna, Maeve Duffy
Summary: This article analyzes low-power, multiphase interleaved buck converters and investigates the benefits of adding more phases for reducing component sizes. It focuses on a typical converter application with a wide operating duty cycle range and a need for good load transient. The study demonstrates that increasing phase numbers is limited in its theoretical reduction of total inductor peak energy due to the restriction of phase current ripple. Additionally, the article evaluates the advantages of inductor coupling and provides guidelines for selecting coupling factors to avoid inductance roll-off. It showcases the implementation of different inductor types in single- and two-phase buck converter prototypes, highlighting size reduction and lower losses in the two-phase designs.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Arindam Samanta, Gianluca Gubbiotti, Saibal Roy
Summary: The study investigates the magnetic properties of exchange spring nanoheterostructured CoP films prepared by electrodeposition at room temperature. Static magnetic measurement reveals different hysteresis loop structures, and the first-order reversal curve distributions confirm the nature of the films. Field-dependent Brillouin light scattering spectra unveil different spin wave modes in the films. The study demonstrates the evolution of the exchange spring structure and the enhanced strength of the exchange coupling in the developed film.
Proceedings Paper
Energy & Fuels
Cian O. Mathuna, Seamus O'Driscoll
Summary: This talk will discuss the performance opportunities and technology challenges of heterogeneous integration of power converters into processor packages through methods like PCB embedding, 2.5D or even 3D packaging. The emergence of magnetics-on-silicon technology and PCB-embedded magnetics technologies, along with integrated high density capacitor technologies, PMICs and power switches, are central to the development of integrated power solutions for multi-core microprocessors and other complex SOC platforms.
2022 24TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'22 ECCE EUROPE)
(2022)
Proceedings Paper
Energy & Fuels
Ruaidhri Murphy, Paul McCloskey, Zhibo Cao, Cian O. Mathuna, Seamus O'Driscoll
Summary: This paper discusses the integration of high-frequency inductor devices into PCBs to achieve higher density integration of power converters, using commercially available thin flexible planar magnetic materials to manufacture toroidal inductors, and comparing magnetic material properties across frequencies through electrical performance testing.
2021 THIRTY-SIXTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2021)
(2021)
Article
Engineering, Electrical & Electronic
Kankana Paul, Dhiman Mallick, Saibal Roy
Summary: This letter presents a potential solution to power wireless sensor networks for the Internet of Things by scavenging mechanical energy from ubiquitous vibrations through miniaturized electromagnetic transducers. Through systematic design study, the compact device topology yielded high EM coupling and improved half-power bandwidth. The designs can be implemented using standard MEMS fabrication methods for potential applications in the IoT.
IEEE MAGNETICS LETTERS
(2021)