## About

173

Publications

59,823

Reads

**How we measure 'reads'**

A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more

1,654

Citations

Introduction

Nadir Idir currently works at the Laboratory of Electrical Engineering and Power Electronics (L2EP), University of Lille. Nadir does research in Power Electronics, EMC, Electronic Engineering and Electrical Engineering. Their current project is 'EMI FILTER FOR WIDE-BAND SEMI-CONDUCTORS (SiC and GaN).'

Education

October 1994 - October 2030

**Institut universitaire de technologie (IUT A)**

Field of study

- Power electronics and Electromagnetic Compatibility (EMC)

## Publications

Publications (173)

High-frequency power converters need electromagnetic interferences filters using common and differential mode chokes with low parasitic capacitance to comply with the electromagnetic compatibility standards. This paper proposes a modelling method of this capacitance and ways to minimize it. The obtained model allows accurate evaluation of the effec...

High-frequency static converters requires inductors, common and differential mode chokes with a low equivalent parallel capacitance. To reduce it, this paper proposes first a semi-analytical model of this capacitance for inductors made with coated ring cores of nano-crystalline material. This model is based on 2D finite element method to compute th...

The stray capacitance of inductors impairs their high frequency impedance. A semi-analytical model is proposed for inductors with conductive core to gain insight for ways to decrease stray capacitance for high frequency power electronic applications. First the elementary capacitances are simulated thanks to 2D electrostatic finite element method (F...

Les capacités parasites des bobines impactent
leur impédance à haute fréquence. Un modèle semi-analytique
de la capacité parasite équivalente pour des
bobines à noyau conducteur (nanocristallin) est proposé
pour expliquer son origine et la réduire, notamment pour
des applications de filtrage pour la compatibilité électromagnétique
(CEM) à haute fré...

In order to model GaN-HEMT switching transients and determine power losses, a compact model including dynamic RDSon effect is proposed herein. The model includes mathematical equations to represent device static and capacitance-voltage characteristics, and a behavioural voltage source, which includes multiple RC units to represent different time co...

Due to the high switching speed of Gallium Nitride (GaN) transistors, parasitic inductances have significant impacts on power losses and electromagnetic interferences (EMI) in GaN-based power converters. Thus, the proper design of high-frequency converters in a simulation tool requires accurate electromagnetic (EM) modeling of the commutation loops...

The paper investigates the management of drain voltage and current slew rates (i.e., dv/dt and di/dt) of high-speed GaN-based power switches during the transitions. An active gate voltage control (AGVC) is considered for improving the safe operation of a switching cell. In an application of open-loop AGVC, the switching speeds vary significantly wi...

The new power GaN transistors allow to increase the operating frequency of converters to megahertz range, thanks to their low switching time that is of a few nanoseconds or less. This permits to reduce the values and the volume of the passive components, and enhance the power density of power converters. However, inductors needed for energy storage...

Because of trapped charges in GaN transistor structure, device dynamic ON-state resistance RDSon is increased when it is operated in high frequency switched power converters, in which device is possibly operated by zero voltage switching (ZVS) to reduce its turn-ON switching losses. When GaN transistor finishes ZVS during one switching period, devi...

Thermal performance of power converters is a key issue for the power integration. Temperatures inside the active and passive devices can be determined using thermal models. Modelling the temperature distribution of high‐frequency magnetic components is quite complex due to the diversity of their geometries and used materials. This study presents a...

In order to better predict the high-frequency switching operation of transistors in power converters, parasitic elements of these devices such as resistances, inductances, and capacitances must be accurately evaluated. This paper reports on the characterization of a gallium nitride (GaN) packaged power transistor using S-parameters in order to extr...

ElectroMagnetic Interferences (EMI) filters are broadly used in power electronic systems in order to respect EMC normative constraints, which considerably increase overall cost and volume mainly because of the common-mode inductor. In this paper, a new method to calculate the minimum volume of the common-mode inductor is proposed. It takes into acc...

This paper presents a PWM strategy for the cancellation of common-mode (CM) voltage generated by three-phase back-to-back two-level inverters. This method theoretically provides complete elimination of the CM voltage by synchronizing all the commutations of one converter with commutations of the other one, so that the overall resulting CM voltage d...

The Ring core inductors are widely used in EMI filters within the aeronautic domain. To optimize, at the design step, the performances of the EMI-filters, a design tool is developed in which a lot of high frequency physical aspects are included.
It's well known that the high frequency behavior of the inductors used in EMI filters is limited by the...

Les composants magnétiques planar sont de plus en plus présents dans les convertisseurs de puissance en remplacement des composants bobinés classiques. L’aspect thermique de ces composants est essentiel pour un fonctionnement correct des structures de puissances. Dans cet article, un modèle thermique de transformateurs planar, basé sur un réseau no...

Since some years, one solution to increase the power density of the power converters consists to use the wide band gap semiconductors like SiC and GaN. These devices allow having power converters that operating with the high switching frequencies. These fast devices induce of very high variations of the voltage (dv/dt) and current (di/dt) during co...

In order to study switching waveforms of a SiCJFET, its inter-electrode capacitances evolution is necessary when the power device is in linear region. In this paper, the reverse transfer capacitance Cgd is at first characterized by the multiplecurrent- probe method and afterwards validated by the measurement with an impedance analyzer. The output c...

Improving the operation of power grid and offering new smart applications, the deployment of a supervisory infrastructure is necessary. One solution to transmit data may be based on the power-line communication (PLC) technology. It consists of the superposition of high-frequency signals with the electrical signal of 50/60 Hz. However, the power gri...

This paper deals the design method of EMI filter associated with buck converter using silicon carbide (SiC) power semi-conductors. It's well known that to comply with EMC standards, EMI filters are necessary. The aim is to propose a design method based on an equivalent electrical circuit. Thus, the first step is the identification of the different...

With the advantage of high bandwidth and small insertion impedance, a current surface probe (CSP) used to measure switching current waveforms is presented in this paper. Its transfer impedance is characterized and validated by measuring an IGBT switching current that is compared with those obtained with a current probe (CP), a current shunt (CS) an...

Revue électronique, étude des problèles de compatibilité électromagnétique des convertisseurs staiques

This paper presents a PWM strategy for the reduction of common-mode (CM) voltage generated by variable-speed motor drives composed of two-level, three-phase active-front-end rectifier and three-phase inverter. This method theoretically provides complete elimination of the CM voltage by synchronizing all inverter commutations with rectifier commutat...

With the advantage of high bandwidth and small insertion impedance, a current surface probe (CSP) used to measure switching current waveforms is presented in this letter. Its transfer impedance is characterized and validated by measuring an IGBT switching current that is compared with those obtained with a current probe and a Hall effect current pr...

This paper focuses on the modeling method of energy cables used in power conversion systems, in the aim of EMC simulation and overvoltage analysis. Based on the node-to-node functions method, a simple frequency-domain model with a reduced number of equivalent impedances is considered and applied to three-wire shielded cables, along with a fast iden...

The switching of the power semiconductors in static converters is the main source of electromagnetic interferences (EMI). To meet with electromagnetic compatibility standards, it is necessary to reduce the level of the conducted emissions. This reduction can be achieved by different techniques including the EMI filters whose design is mainly based...

Planar magnetic components are promising solutions for the integration of power electronic systems. The leakage inductance of such components plays an essential role in power converters. In this paper, an analytical modeling method for leakage inductance computation is developed for planar components with plastoferrite leakage layers. This method i...

Two current probes are designed with the appropriate magnetic material in order to make impedance measurements in High Frequency (HF) using the Current Injection Method (CIM). These probes are then used to measure the commonmode impedance of power converters in real-operating conditions. The characterization of this impedance is required for a corr...

In the simulation of power electronics systems, for reasons of computing time and convergence, it may be necessary to use ideal components which generate ideal voltage switchings (steep edges). However, in reality, these voltage variations are far from ideal and to reproduce a voltage closer to reality, it is necessary to model these variations. Th...

The magnetic material when designing EMI filter determines the inductance value and the parasitic elements that influence the insertion loss effectiveness of the filter. Moreover, the EMI filter characterization is usually realized at low power levels (low current and low voltage). When the EMI filter is subjected to higher currents through its coi...

The classic procedure design of EMI filters determines the insertion loss of the common mode and differential mode filters under standardized 50© at the input and output impedances. In order to choose the more adapted filter topology for a static converter, it's necessary to consider the exact impedances connected to the input and output port in op...

In order to enhance the performance of electromagnetic interference (EMI) �lters,
it is necessary to identify high-frequency parasitic elements of their passive
components, mainly those related to the coupled inductors. Motivated by this
issue, in this work a realistic high-frequency model is proposed for the coupled
inductors. Actually, using inte...

With the advantage of high bandwidth and small insertion impedance, a current surface probe (CSP) used to measure switching current waveforms is presented in this paper. Its transfer impedance is characterized and validated in the first time by measuring an IGBT switching current with a passive current probe (CP) and a Hall effect current probe (HE...

Dans le domaine de la variation de vitesse, les perturbations conduites de mode commun sont les plus difficiles à maîtriser du fait des multiples chemins de propagation possibles. Ces perturbations peuvent être réduites à l’aide de filtres passifs qui sont généralement très volumineux. Une solution pour réduire la taille de ces filtres consiste à r...

Afin d’étudier les commutations du transistor SiC-JFET “ Normally-off ”, l’évolution des capacités inter-électrodes est présentée dans ce papier lorsque le composant est en régime désaturé. La capacité de contre-réaction Cgd est tout d’abord caractérisée par la méthode des pinces de courant et ensuite validée par la mesure à l’aide d’analyseur d’im...

In recent years, design and service evolution in electric distribution networks are mainly guided by the increasing in the customer consumption and the emergence of new sources and loads such as renewable energy, electric and hybrids vehicles. The lack of control over these new constraints in the future may lead to technical and financial problems....

The characterization of voltage-dependent capacitances of power semiconductor devices [diode, MOSFET, insulated gate bipolar transistor (IGBT), etc.] is very important for modeling their dynamic performances. A measurement method using two current probes has been developed to characterize interelectrode capacitances of power devices while isolating...

Two current probes, based on the current injection method, are designed with appropriated high frequency magnetic material. These probes are used to measure the common-mode impedance of power converters in real-operating conditions. The characterization of this impedance is of importance for the EMI filter design. In this paper, a simple formulatio...

The electrical power aboard aircraft tends to increase thanks to the progress in switched-mode power converters. The generalization of the use of power converters leads to EMI issues. The EMC standards compliance is often obtained by adding an EMI filter after a measurement on a prototype. Since prototyping is costly and time consuming, it is inter...

This paper presents a method to improve EMI filters performances, based on the optimization of the component layout. It's well known that the EMI filter insertion losses are highly degraded by the high frequency stray couplings between filter passive components. The latter can be reduced by acting on these components' placement. This paper proposes...

The characterization of voltage-dependent capacitances of power semiconductor devices is very important for modeling their dynamic performances. A measurement method using multiple current probes has been proposed to characterize inter-electrode capacitances of power devices. The advantage of this method is that it can isolate the measurement devic...

This paper presents an analytical method for calculating the parasitic capacitances of planar components with 3 dimensions. The calculation is based on the Electric Field Decomposition (EFD) between multi-conductors. 2D formulations used in micro-electronics have been extended to enable the applications on the cases of planar magnetic components. T...

Power converters with high switching frequency generate conducted electromagnetic interference (EMI) noise. EMI filters are thus widely used to reduce these conducted noises for the compliance with electromagnetic compatibility standards. In this paper, a high-frequency (HF) equivalent circuit model for common mode (CM) chokes used in EMI filters i...

Electromagnetic interference (EMI) filters are main solutions to suppress the conducted emissions from static power converters. For some years, integration techniques for EMI filters have been widely investigated to realize more compact systems. In this letter, a common-mode (CM) choke with toroid-EQ mixed structure is presented. This structure is...

Since the early 1990's, electrical energy tends to replace pneumatic and hydraulic energy aboard aircrafts. This is lead by MEA project and allows to reduce weight and volume of the actuators. But an increase of onboard electric energy leads to EMI issues. To comply with EMC standards, an EMI filter is often added to the electrical systems. In orde...

EMI filters are essential parts in power converters which is used to reduce the conducted emissions in order to meet with EMC standards. However, the parasitic elements of the passive components in the filters limit their performances on high frequencies. This paper proposes an analytical model for the parasitic capacitances of CM inductors in plan...

This paper deals with a high-frequency modeling method of the coupled inductors used in electromagnetic interference (EMI) filters. These filters are intended to reduce conducted emissions generated by power static converters towards the power grid. To model the EMI filters, it is necessary to identify the various parameters of the passive elements...

The passive magnetic ferrite components used in EMI filters have a complex magnetic permeability (CMP) which varies with frequency. The CMP in frequency range from 150 kHz to 30MHz is not given by manufactures. Moreover, measurement techniques require some specific size and shape of sample to measure CMP of ferrites. Common application of these pas...

The increase of electric energy in aircraft leads to EMI issues, because the use of power electronics converters induces sharp voltage and current variations. EMC standards compliance often calls for EMI filtering. In order to simulate a system up to 50MHz it is necessary to use high frequency models of the studied system. The subject is to perform...