Jérémie Aimé

Busbar Design: How to Spare Nanohenries ?

This paper intends to compare the many different solutions available to design a busbar interconnection. Starting from a single copper plate and going to multilayer busbars, the influence of the external shape of the sheet, of the number and the nature of holes and apertures are considered. Simulations and measurements are used to determine the stray inductance of the different busbars. Design rules are deduced from the many case studies, based on industrial examples

EMC Modeling of an Industrial Variable Speed Drive With an Adapted PEEC Method

This paper presents an adapted partial element equivalent circuit (PEEC)-based methodology applied to the modeling of interconnections of power electronics devices. Although this method is already well known, the originality of this work is its use to model a device presenting an industrial complexity. To make possible this modeling, two adapted integral methods, based on two different meshings, are presented. They are dedicated respectively to the computation of parasitic inductances and capacitances and lead to an equivalent circuit of the system. From a time-domain simulation of this circuit, current and voltage sources can be extracted and used to compute the radiated near magnetic field. This approach has been applied to model a real industrial static converter via system couplings, a variable speed drive. Good agreements have been obtained between simulated and measured results on conducted and emitted electromagnetic analysis.

Design of Power Electronic Transformer based on Cascaded H-bridge Multilevel Converter

One key component of the future automation in electrical network is the replacement of conventional distribution transformers by an all-solid-state (power- electronic) alternative. In this paper, the optimum design of a power electronic transformer (PET) based on state of the art cascaded H-bridge multilevel converter is investigated. In the design process, a new and simple control method for balancing the cascaded H-bridge DC buses has been introduced. The proposed PET is extremely modular and can be extended for different voltage and power levels. It performs typical functions and has advantages such as power factor correction, elimination of voltage sag and swell, and reduction of voltage flicker in load side. Also in comparison to conventional transformers, it has lower weight, lower volume and eliminates necessity for toxic dielectric coolants.

Comparison of FEM-PEEC Coupled Method and Finite-Element Method

This paper analyzes the efficiencies of the new coupling between finite-element methods (FEMs) and the partial element equivalent circuit method (PEEC), which are computation time and memory space. To show its performance, a common mode filter is modeled by the coupling and the results are then compared with those of a FEM analysis. The comparison shows that the coupling is very efficient to model electromagnetic systems comprising magnetic materials and systems of complex thin conductors.

Layout techniques for reduction of common mode current in static converters

The radiation is, for the most part, generated by common-mode currents. This paper shows that action on layout can reduce common-mode currents effectively. Cost-effective, the common-mode current control enables the radiation level knowledge at the conception of a device. This is an important gain of time. Four boost structures are studied in order to validate first, experimentally and second by modelling, reduction common-mode current layouts, supposed effective. The simulated models are based on the partial equivalent element circuit (PEEC) method. We show also the impact of these layout techniques on radiated perturbations

Numerical methods for eddy currents modeling of planar transformers

Having many advantages compared to classic wire wound technology; planar magnetic components are largely used. Modeling tools are required to help designers for less time consuming conception. Nevertheless, number of adapted modeling solutions is limited by the complexity of such geometries. The determination of appropriate description (2D or 3D) for eddy currents modeling and by this way AC copper losses evaluation are investigated in this paper. The validity of the approach is successfully presented on an industrial application from the current evaluation until thermal simulations.

Determination of the layout influence on the effectiveness of a three-phase common mode filter by using equivalent circuits and PSpice

Conducted and radiated disturbances of motor driver associations are due to differential and common mode currents. Common mode filters are usually used to evacuate common mode currents from the static converter to the earth. In consequence, such structures play a main role in disturbance reduction and are widely used in industry. However, stray elements of components and layout can reduce the filtering effectiveness. A modeling method taking into account all stray elements of industrial multilayer structures is presented. A three-phase common mode filter is modeled and optimized. This filter is implemented in a four layers industrial motor driver. The common mode inductance is modeled using complex inductive equivalent model. The layout impedance is computed using PEEC method. The electric computing is achieved using Spice.

Magnetic field computation of a common mode filter using Finite Element, PEEC methods and their coupling

The layout and wounded components are sources of radiated perturbations in static converters. Used to reduce conducted perturbations, common mode filters can be responsible of the incompliance to radiated standards. Magnetic field computation of common mode filters allows defining their radiated perturbation level during the definition. This allows earning time considering the design process of the whole system (static converter-filter-driver) is an important gain of time. An original modeling method is presented. The common mode inductance is modeled using finite element method. The layout is modeled using partial element equivalent circuit (PEEC) method. Then, the PEEC model is imported into the finite element one. By this way, interaction phenomena between the inductance and the layout are modeled.

Far field extrapolation from near field interactions and shielding influence investigations based on a FE-PEEC coupling method

Considering standards, the main source of far field emitted by power electronic structures is the common mode current generated by the floating potentials tracks. Moreover, due to the frequency and power increases, the compliance to EMC becomes more and more difficult. In consequence, it is necessary to investigate practical solutions to reduce the emitted field. A useful solution is the shielding of wounded components which are near field influent sources. But this solution may be not efficient for far field reduction and investigations concerning component placement can be a better and cheaper solution. A FE-PEEC hybrid method was developed and can be used to investigate near field interactions and shielding influence. The method is applied to a structure combining a common mode filter with the floating potentials of an inverter. Using the hybrid method, the near field interactions and the influence of the common mode inductance shielding are analyzed on the floating potentials which are the sensitive part of the structure.