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Alfred Rufer

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Publications associées (215)

Control of a Hybrid Asymmetric Multilevel Inverter for Competitive Medium-Voltage Industrial Drives

Alfred Rufer, Martin Veenstra

In symmetric multilevel inverters, there is a tradeoff between the output quality and the reliability and efficiency of the converter. New asymmetric and hybrid solutions, using different voltages and devices in various parts of the inverter, promise signi ...

2005

An overview of the technique of asymmetrical multilevel inverters

Alfred Rufer

This paper deals with cascade multilevel inverters. It focuses on asymmetrical topologies where the cell input voltages are of different values. These hybrid topologies might be interesting for several applications. One of the main benefit is the high reso ...

2005

Acoustic Mapping for Active Transformer Quieting Applications Based on a Modular DSP Platform

Alfred Rufer, Eric Van Lancker, Christian Blanc

The Laboratoire d’Electronique Industrielle has realized an active noise controller. The system is designed to efficiently attenuate low frequency transformer noise where passive methods are either ineffective or tend to be very expensive. This paper descr ...

2005

Hybrid Energy Storage Systems based on Compressed Air and Supercapacitors with Maximum Efficiency Point Tracking

Alfred Rufer, Sylvain Lemofouet-Gatsi

Beside the high-capacity storage facilities based on hydro-power technologies, electrochemical solutions are the today's candidate for storage for renewable energy sources. However, limited life-cycles and sustainability of batteries are often inhibiting f ...

2005

Hybrid Energy Storage System based on Compressed Air and Super Capacitors with MEPT (Maximum Efficiency Point Tracking)

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents a hybrid energy storage system based on Compressed Air Energy Storage (CAES), where the charging and discharging is done within maximum efficiency conditions. As the maximum efficiency conditions impose the level of converted power, an ...

2005

Non-Linear Properties and Efficiency Improvements of a Bi-Directional Isolated DC-AC Converter with Soft Commutation

Alfred Rufer, Christophe Chabert

This paper presents the operation principle and the properties of a single-phase DC-AC converter with medium frequency transformer and soft commutation. The influence of the non-dissipative snubber capacitor and the transformer parasitic components for ZVS ...

2005

A flexible 4kW - 3 Phase - 2 Switch PFC Power Rectifier for Supplying a Modern EDM Machine

Alfred Rufer

Power Factor Corrected rectifiers are a new tendency in development of power supplies. In the last few years, a lot of R&D activities have led to a new category of products for one-phase applications. In this contribution, a new simplified topology is prop ...

2005

Non-Equilibrium State Capacitor-Voltage Stabilization in a Hybrid Asymmetric Nine-Level Inverter: Non-Linear Model-Predictive Control

Alfred Rufer, Martin Veenstra

2005

A new solution for increasing the efficiency of an electric scooter with supercapacitors through a novel, interleaved multi-channel DC/DC converter

Alfred Rufer, Blaise Destraz, Philippe Barrade

Scooters are a well-established transport system for short distances – particularly within cities. Currently, the majority of scooters are petrol powered. Their engines typically exhibit bad efficiencies and thus contribute to global warming by CO2 product ...

2005

A hybrid energy storage system based on compressed air and supercapacitors with maximum efficiency point tracking

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents a hybrid energy storage system based on Compressed Air Energy Storage (CAES), where the extraction of energy is done within maximum efficiency conditions. As the maximum efficiency conditions impose the level of converted power, an inte ...

2004

Principle of a hybrid Compressed Air and Supercapacitors Energy Storage system with Maximum Efficiency Point Tracking

Félix Grasser, Alfred Rufer, Philippe Barrade, Sylvain Lemofouet-Gatsi

2003

Analytical analysis of Quasi-Saturation Effect in PT and NPT IGBTs

Serge Pittet, Alfred Rufer

During the turn-on process insulated gate bipolar transistors (IGBTs) traverse a quasi-saturation region from the off.state to the on-state (saturation). The additional voltage drop due to the quasi.saturation of the junction hardly depends on the DC-link ...

2002

Importance of Quasi-Saturation Effect in the Bipolar Junction of High Voltage NPT- IGBTs for power calculations

Serge Pittet, Alfred Rufer

During the turn-on process insulated gate bipolar transistors (IGBTs) traverse a quasi-saturation region from the off-state to the on-state (saturation). The additional voltage drop due to the quasi-saturation of the junction hardly depends on the DC-link ...

2001

Energy storage system using a series connection of supercapacitors, with an active device for equalizing the voltages

Serge Pittet, Alfred Rufer, Philippe Barrade

An energy storage system based on battery and supercapacitors is presented. It allows bigger amount of intantaneous power. The properties of the proposed system are oriented in high efficiency, in a special topology with parallel channels. The paper presen ...

2000

Series connection of supercapacitors, with an active device for equalizing the voltages

Serge Pittet, Alfred Rufer, Philippe Barrade

The paper presents an active sharing device, for equalizing the voltages across a series connection of supercapacitors. This ensures an optimal value for the stored energy. Based on a buck-boost topology, this device is designed and controlled to propose a ...

2000

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