Eric Laboure

The Current Sensors in Power Electronics, a Review

Abstract Current sensors are widely used in all the fields of electrical engineering and power conversion. The applications are very diverse: current measurements in semiconductors, current sensing for variable speed drive, current measurement in high voltage networks. These examples show the great diversity of performances, electrical constraints and environmental constraints of these sensors. In this paper a state-of-the-art is presented about the main types of sensors, so that the user can optimise his choice with respect to the problem to solve.

Core losses measurements in intercell transformers for interleaved converters

In interleaved converters, the commutation cells can be interconnected by intercell transformers. In this paper we show how a modified sequence of the voltages applied to windings reduces the flux density in the magnetic core branches. Experimental measurements confirm the flux reduction obtained with the modified supply. Thermal measurements were made in order to evaluate the reduction of total core losses when the modified supply is used.

Ferroelectric loop modelling based on experimental Preisach density determined by FORC method

In this article a Preisach type density will be used to reconstruct the capacitive effects associated to a ferroelectric loop. This density will be experimentally determined using the FORC method. The small-signal capacitance, which can not be modelled by a Preisach type density, is measured simultaneously and must be subtracted from total capacitive effect. It will be shown finally that all ferroelectric loops, including minor loops, can be correctly reconstructed from this experimental Preisach density, on the condition that the small-signal capacitance is taken into account.

Gate driver with efficient energy recovery for a 3 MHz resonant converter

This paper shows a new insulated gate driver with efficient energy recovery for the top and bottom switches of an half bridge. This gate driver is design to drive the main switches of a 3 MHz resonant converter (48 V/3.3 V 20 Watts). The originality of this driver comes from its low number of devices and its high frequency operation even if it drives switches having a high gate capacitor, as TrenchMos. The gate driver theoretically only provides the power dissipated by the internal power MOSFET gate resistance. This gate driver is dedicated to high frequency resonant converter with a 0.5 duty cycle

Impedance calculation of integrated magnetic components in a wide frequency range

Based on a simplified field analysis, expressions are derived to calculate the set of frequency-dependent impedances of a planar magnetic component. This model is derived from the layout, the dimensions and the magnetic materials properties. It provides the foundation for a flexible approach to design and optimize integrated passive components. Data issued from an integrated magnetic component are used to illustrate the accuracy and the limitations of such a method

Dynamic electric model for IGBT power module based on Q3D® and Simplorer®: 3D Layout design, stray inductance estimation, experimental verifications

The layout of power modules is one of the key points in power module design, especially for high power densities, where couplings are increased. Stray inductances cause various problems in switching devices and should be minimized at an early design stage to avoid later required countermeasures and redesign after the device prototype has been built. In this paper, using Ansys® Q3D® Extractor, electromagnetic simulation is carried out to extract and evaluate the inductive and resistive parasitics of one phase of a three-phase automotive inverter module with rating of 650 V–400 A. The purpose is to develop and verily the electrical model including parasitic parameters for the studied phase-leg operating as a chopper. The switching behavior of the studied structure is analyzed based on Ansys® Simplorer® simulation, and a dynamic electrical model is carried out. Experimental test measurements are performed. The comparison between the simulation models and the experimental data is reported and conclusions are made.