Polypropylene metallizedcapacitors are of general use in power electronics because of their reliability, theirself-healing capabilities, and their low price. Though the behavior of metallized coiledcapacitors has been discussed, no work has been carried out on stacked and flattenedmetallized capacitors. The purpose of this article is to suggest an analytical model ofresonance frequency, stray inductance and impedance of stacked capacitors. We first solve theequation of propagation of the magnetic potential vector (A) in the dielectric of anhomogeneous material. Then, we suggest an original method of resolution, like the one usedfor resonant cavities, in order to present an analytical solution of the problem. Finally, we give some experimental results proving that the physical knowledge of the parameters of the capacitor (dimension of the component, and material constants), enables us to calculate an analytical model of resonance frequency, stray inductance and impedance of stacked capacitors.

This paper presents a new method of switching management for four quadrant switches (FQS) of matrix converters. By discriminating the FQS command orders, it is possible to lay down the FQS configuration (transistor or diode). The presented method uses the load current sign and zero closeness information to ensure good sequencing of command orders. By using Mealy state machines, we simplify the existing state diagrams for any phase number switching cell. The successful results on a three-phase switching cell, without oversized power circuit, validate this new state diagram structure.