Vincent Ardon

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.

MoM and PEEC Method to Reach a Complete Equivalent Circuit of a Static Converter

This paper presents an application of the Method of Moments (MoM), to compute parasitic capacitances of a power electronics layout. By coupling these capacitances to a resistive and inductive equivalent circuit obtained thanks to Partial Element Equivalent Circuit (PEEC) method, a complete electrical equivalent circuit made of lumped elements is obtained. Its simulation by means of a SPICE-like tool enables the evaluation of the EMC efficiency of a power electronics structure. This method is applied to a boost converter and the results obtained by numerical simulation (MoM and finite element method - FEM) are compared to measurements. Finally, radiated EMC investigations are presented thanks to circuit simulation and measurements.

Formal Sensitivity Computation of Magnetic Moment Method

This paper presents a methodology for computing formally sensitivities of the magnetic moment method. This numerical method is known to be very accurate and light to compute force and torque acting on an open field problem. We propose an approach which computes formal derivatives with respect to the geometrical parameters of the device. Once the sensitivities are obtained, gradient based optimization algorithm can be used.

EMC behavior of static converters thanks to radiated field modeling using an equivalent electrical circuit

Concerning power electronics converters, due to frequency and/or power rising, EMC constraints become more and more important for industrials and compliance with standards is not guarantee. In consequence, anticipation becomes a key word for engineers and the conception using computer aided design tools is actually more suitable. That is why, nowadays, efforts are focused on model developments. Unfortunately, modeling methods are limited by the complexity of industrial products. This complexity is due to the geometries with arbitrary shapes and to the nature of associated components (magnetic or not). This paper presents the EMC modeling of static converters with an application to a variable speed drive using integral methods. PEEC, AMLFMM methods and a circuit simulator are combined to compute the differential and common mode sources and finally the emitted field.