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282 results on '"Castellazzi, Alberto"'

9. Hybrid GaN-SiC Power Switches for Optimum Switching, Conduction and Free-Wheeling Performance

Author

Battuvshin Bayarkhuu, Nath Tripathi, Ravi, Omura, Ichiro, and Castellazzi, Alberto

Subjects
Wide bandgap devices, Hybrid GaN-SiC, GaN HEMT, SiC MOSFET
Abstract

In the wide bandgap (WBG) arena, it is generally considered that GaN and SiC are competitors for the 600 V voltage class. However, in reality, they possess partly highly complementary functional characteristics, which, when duly combined, can yield advanced performance in power conversion applications. Here, the focus is specifically on the development of a hybrid GaN-SiC power switch to demonstrate superiority over either a GaN-only or SiC-only transistor. It is an original undertaking, whose outcomes will be directly applicable to several application domains., IEEE International Symposium on Power Semiconductor Devices and ICs (ISPSD 2022), 22-25 May 2022, Vancouver, Canada

Published
2022
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29. Empowering International, Intersectoral and Interdisciplinary Dimensions in Higher Education: The STEPS and EECPS Master Courses Experience

Author

Garcia, Jorge, primary, Arboleya, Pablo, additional, Gonzalez-Moran, Cristina, additional, Garcia, Pablo, additional, Perdigao, Marina, additional, Pereirinha, Paulo, additional, Agreira, Cristina, additional, Capponi, Fabio Giulii, additional, De Donato, Giulio, additional, Castellazzi, Alberto, additional, and Williams, Arthur, additional

Published
2019
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38. Numerical Simulation and Analytical Modeling of the Thermal Behavior of Single- and Double-Sided Cooled Power Modules.

Author

Catalano, Antonio Pio, Scognamillo, Ciro, d'Alessandro, Vincenzo, and Castellazzi, Alberto

Subjects
FINITE element method, COMPUTER simulation, CASCADING style sheets, HUMAN behavior models, THERMAL analysis
Abstract

This article presents the detailed thermal analysis and modeling of multichip power modules (PMs). For the first time, a fair thermal comparison between the widespread single-sided cooled (SSC) technology and the innovative double-sided cooled (DSC) one is presented. The latter solution emerges among all packaging techniques due to its improved electrical performances and mechanical reliability. The investigation is carried out using 3-D finite-element method thermal simulations automated by an in-house routine. The PMs under test are thoroughly studied in a wide range of boundary conditions (BCs) in order to support the choice of an appropriate cooling strategy and the comprehension of the heat spreading (HS) effect occurring in such domains. In addition, attention is paid to dynamic behavior. Thermal modeling strategies are then proposed and discussed. As the main finding, no relevant thermal discrepancies were observed in the two PM technologies. In most of the BCs, the SSC PM enjoys an enhanced HS effect leading to a better thermal behavior with respect to the DSC counterpart, the adoption of which is justified only in the presence of excellent cooling systems. [ABSTRACT FROM AUTHOR]

Published
2020
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39. Study of Dual Active Bridge With Modified Modulation Techniques for Reduced Link Current Peak Stress and Harmonics Losses in Magnetics.

Author

Maharana, Suman, Mukherjee, Srija, De, Dipankar, Dash, Abinash, and Castellazzi, Alberto

Subjects
MAGNETICS, MAGNETIC flux leakage, MATHEMATICAL analysis, BRIDGE circuits, PHASE modulation
Abstract

High-frequency-link power-conversion is gaining popularity in recent days due to reduction of the size and weight of the converters for various applications. The performance of the dual active bridge heavily depends on the nature of modulation strategy used and on the loading conditions. Look-up table (LUT) based output power and output voltage dependent modulation strategies to investigate the peak current stress and harmonics in high-frequency link current is proposed in this article. The modulator is, thus, simple to implement. The peak stress, the harmonics (total demand distortion) in link current, and associated losses due to the proposed techniques are compared in four main cases, namely, first, single-phase shift, second, dual-phase shift, third, triple phase shift, and, fourth, modified phase shift (MPS)-I, -II, and -III. In MPS-I, weighted aggregate of harmonic currents minimization including fundamental component is carried out to achieve the minimum conduction losses in the magnetic elements. The same method is extended for minimizing the peak-to-peak ripple in the link current as MPS-II. In MPS-III, the desired total demand distortion in the ac-link current is enforced. The variation of voltage transfer ratio between input and output is taken into consideration using two-dimensional (2-D) LUT. Moreover, the requirement of 2-D LUTs are eliminated by using suitable curve-fitting exercise for the output load voltage variation and 1-D LUTs of coefficients. A detailed simulation study, associated mathematical analysis of the methods adopted and experimental verification are presented from 1 kW prototype. [ABSTRACT FROM AUTHOR]

Published
2020
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