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Concept

Théorème de Thévenin

Publications associées (31)

Ripple Voltage and Loss Reduction of Single-Phase ISOP SST by Eliminating the Second Harmonic Current in LLC Converters

Drazen Dujic, Andrea Cervone, Tianyu Wei

In two-stage solid-state transformers with input-series output-parallel structure, the LLC converter operating at a fixed switching frequency is a common choice for the isolated DC/DC conversion stage because it can provide a high efficiency and a fixed vo ...

2024

Shedding light on the MRI-driven dynamo in a stratified shearing box

Abhijit Bhausaheb Bendre

We study the magneto-rotational instability (MRI) dynamo in a geometrically thin disc (H/R < 1) using stratified zero net (vertical) flux shearing box simulations. We find that mean fields and electromotive forces (EMFs) oscillate with a primary frequency ...

2024

Tri-Axial Magnetic Field Sensor up to VHF with Frequency Weighing

German Augusto Ramirez Arroyave

This contribution presents an isotropic magnetic field probe with shaped frequency response in the band 100 kHz - 400 MHz to ponder the aggregate response according to the ICNIRP 2020 guidelines. The basic sensor is a printed loop which is modelled as a Th ...

IEEE2023

A novel approach for SPICE modeling of light and radiation effects in ICs

Chiara Rossi

Modeling the interaction of ionizing radiation, either light or ions, in integrated circuits is essential for the development and optimization of optoelectronic devices and of radiation-tolerant circuits. Whereas for optical sensors photogenerated carriers ...

EPFL2021

Prediction of optically-triggered amplification in phototransistor with SPICE circuit simulators

Jean-Michel Sallese, Chiara Rossi

Modeling of optoelectronic devices involves long and complex numerical simulations, usually performed with TCAD tools. Numerical simulations provide accurate results for a single device but are not feasible when dealing with a full circuit comprising sever ...

SPIE-INT SOC OPTICAL ENGINEERING2020

Passivation Mechanism Exploiting Surface Dipoles Affords High-Performance Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Paul Joseph Dyson, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Kevin Sivula, Jun Ho Yum, Thomas La Grange, Kazuteru Nonomura, Erfan Shirzadi, Fatemeh Ansari

The employment of 2D perovskites is a promising approach to tackling the stability and voltage issues inherent in perovskite solar cells. It remains unclear, however, whether other perovskites with different dimensionalities have the same effect on efficie ...

AMER CHEMICAL SOC2020

Exposure assessment of body-implanted capsules in the 100-MHz–5-GHz range

Anja Skrivervik, Denys Nikolayev

Body-implanted bioelectronics rely on antennas to interface with external on- or off-body equipment. For a given input power, the antenna type and operating frequency significantly affect the power dissipation in tissues. This study addresses the exposure ...

2019

A Generalized Index for Static Voltage Stability of Unbalanced Polyphase Power Systems including Thévenin Equivalents and Polynomial Models

Mario Paolone, Andreas Martin Kettner

This paper proposes a Voltage Stability Index (VSI) suitable for unbalanced polyphase power systems. To this end, the grid is represented by a polyphase multiport network model (i.e., hybrid parameters), and the aggregate behavior of the devices in each no ...

IEEE Institute of Electrical and Electronics Engineers2019

Real-Time State Estimation and Voltage Stability Assessment of Power Grids: From Theoretical Foundations to Practical Applications

Andreas Martin Kettner

The operators of power distribution systems strive to lower their operational costs and improve the quality of the power service provided to their customers. Furthermore, they are faced with the challenge of accommodating large numbers of Distributed Energ ...

EPFL2019

Electrical energy generated by silicone elastomers filled with nanospring- carbon- nanotubes

Frank Nüesch

Dielectric elastomer generators (DEGs) are flexible capacitors that convert mechanical into electrical energy. They rely on an external voltage source to charge the capacitor during each operation cycle. An alternative to this is an autonomous DEG which op ...

Royal Society of Chemistry2019

Modeling Surface Recombination with Enhanced Devices Network for Optoelectronics

Jean-Michel Sallese, Camillo Stefanucci, Pietro Buccella, Chiara Rossi

We present a lumped devices network approach to simulate surface recombination effects in optoelectronics devices. The network is composed of generalized lumped devices where the excess carrier concentrations and gradients are mapped on electrical quantiti ...

IEEE2018

SPICE Modeling of Photoelectric Effects in Silicon With Generalized Devices

Jean-Michel Sallese, Camillo Stefanucci, Pietro Buccella, Chiara Rossi

Modeling photoelectric effects in semiconductors with electrical simulators is demonstrated in typical 1-D and 2-D architectures. The concept is based on a coarse meshing of the semiconductor with the so-called generalized lumped devices, where equivalent ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2018

Dispatching Stochastic Heterogeneous Resources Accounting for Grid and Battery Losses

Mario Paolone, Jean-Yves Le Boudec, Fabrizio Sossan, Lorenzo Enrique Reyes Chamorro, Eleni Stai

We compute an optimal day-ahead dispatch plan for distribution networks with stochastic resources and batteries, while accounting for grid and battery losses. We formulate and solve a scenario-based AC Optimal Power Flow (OPF), which is by construction non ...

2018

Advances in the characterization of nanowire photovoltaic devices

Dmitry Mikulik

III-V nanowires (NWs) have a great potential for solar energy applications due to their diameter-dependent optical properties, which may enhance absorption of light. In addition, core-shell radial p-i-n structures, in which the direction of light absorptio ...

EPFL2018

Battery-Free, Sticker-Like, Device for Health Monitoring, Operated by Optical Power Transfer

Sandro Carrara

This work presents the concept of a battery-free, sticker-like, device for a non-invasive health-monitoring sensor. The device consists of two functional blocks: an optical power-transfer block and an amperometric measurement block. The former accumulates ...

IEEE2018

Dynamic Modeling of Magnetic Components for Circuit Simulation of Power Electronic Systems

Min Luo

Magnetic components play an important role in a power electronic converter system. They provide energy buffering, galvanic isolation and voltage ratio conversion and have significant impact on the overall performance of the system regarding power efficienc ...

EPFL2018

Two Full Parameter Identification Methods for Synchronous Machine Applying DC-Decay Tests for a Rotor in Arbitrary Position

Jean-Jacques Simond, Mai Tu Xuan, Frédéric Michael Maurer

The main obstacle to a wide use of dc-Decay tests lies in the necessity to align the rotor with the d- or q-axis, which is very difficult to perform for high-power units. The goal of this paper is to propose and validate standstill dc-Decay measuring metho ...

Ieee-Inst Electrical Electronics Engineers Inc2017

Equivalent Admittance Approach for the Scattering of Patch/Slot-Based Frequency Selective Surfaces

Juan Ramon Mosig, Maria Garcia Vigueras

The equivalent admittance of a 2-D array of printed metallic patches/apertures is obtained here by extending a precedent equivalent circuit approach reported by some of the authors. The goal of the present extension is to cover more complex situations like ...

Ieee2016

Two Novel Methods for Parameter Identification of Synchronous Machine Using DC-Decay Test with Rotor in Arbitrary Position

Jean-Jacques Simond, Mai Tu Xuan, Frédéric Michael Maurer

The goal of this paper is to propose and validate standstill DC-Decay measuring methods for a rotor in arbitrary position. The first new method (DC-Decay I) delivers the equivalent circuit with a few measurements. The second new method (DC-Decay III) permi ...

IEEE2016

Simplified Modal Expansion to Analyze Frequency-Selective Surfaces: An Equivalent Circuit Approach

Juan Ramon Mosig, Maria Garcia Vigueras

This communication extends a previously reported analytical circuit that models the plane wave scattering by 2-D arrays of planar patches/apertures embedded in a layered media. In this extension, it is assumed that the current/electric field spatial profil ...

Ieee-Inst Electrical Electronics Engineers Inc2016