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Makdessi M.,University Claude Bernard Lyon 1 | Sari A.,University Claude Bernard Lyon 1 | Venet P.,University Claude Bernard Lyon 1 | Aubard G.,Exxelia Technologies | And 4 more authors.
Microelectronics Reliability | Year: 2015

Under steady voltage and temperature stresses, capacitance can be considered as a reliable aging indicator since in such conditions, metallized polymer film capacitors suffer from the gradual loss of their electrode surface. Empirical laws are most often considered to predict the operating lifetime of energy storage systems under specific environmental conditions. However, expected lifetimes in this case are not able to track the capacitors degradation with time. In this paper, a special capacitance degradation model is proposed based on several experimental aging tests at different temperatures and voltage stresses. A total of 30 capacitors using a novel high-voltage high-temperature (HVHT) polymer as dielectric have been studied and compared to validate the proposed law. This novel HVHT polymer offers significant improvements upon the standard dielectric materials, providing excellent self-healing capability with an enhanced energy density. © 2015 Elsevier Ltd.

Makdessi M.,University Claude Bernard Lyon 1 | Sari A.,University Claude Bernard Lyon 1 | Aubard G.,Exxelia Technologies | Venet P.,University Claude Bernard Lyon 1 | And 2 more authors.
IEEE International Symposium on Industrial Electronics | Year: 2015

Metallized polymer film capacitors, assuming a special position among the various types of capacitors thanks to their capabilities to self-heal, became the components of choice for critical power electronics applications requiring optimized performances such as, avionics, automotive and railways equipment's. However, as a result of the increasingly growing demand for guaranteeing safety and enhancing reliability, a greater interest has been devoted to the health monitoring of power electronics devices. In this paper, an online health monitoring approach for metallized film capacitors is proposed based on the estimation of their precursor parameters. The proposed technique makes use of the already existing current, voltage and temperature sensors for the power drive command/control purposes, and do not need the injection of additional external signals. To demonstrate and validate the effectiveness of such technique, the resulting algorithm was simulated on a set of capacitors at different degradations rates with Matlab/Simulink software. In this paper is also presented a novel 'PEN type' polymer. This high-temperature polymer has great advances over the standard polymers films providing excellent self-healing capability with an enhanced energy density, making it one of the most compact film capacitors on the market. © 2015 IEEE.

Moeuf A.,SUPMECA QUARTZ | Tamayo S.,MINES ParisTech | Lamouri S.,Arts et Metiers ParisTech | Pellerin R.,Ecole Polytechnique de Montréal | Lelievre A.,EXXELIA TECHNOLOGIES
IFAC-PapersOnLine | Year: 2016

The purpose of this article is to explore the difficulties experienced when implementing Lean Manufacturing in small and medium sized enterprises (SME). In this work, we draw up a dual evaluation focusing first on the key characteristics of SMEs and then on the management principles of Lean Manufacturing. Based on an analysis of the scientific literature, we observe a number of conflicts between the characteristics identified for SMEs and Lean Manufacturing. The absence of functional organization, lack of methodology and deficiency of formal procedures are often the cause of difficulties experienced by SMEs during the implementation of Lean practices. The analysis of the literature suggests that the notions of leadership, expertise and decision-making are crucial when implementing Lean Manufacturing. However, in the framework of SMEs, these elements tend to be concentrated under the responsibility of the head of the enterprise, leading to several strengths and weaknesses for such implementation. © 2016

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