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Failure Analysis of Ceramic Substrates Used in High Power IGBT Modules

Engineering（科研） 2016年第9期8卷 561-571页

作者： Zenjebil Jouini zarel valdez-nava David Malec LAPLACE Université de Toulouse CNRS INPT UPS Toulouse France

High voltage power modules are used in numerous applications to build high power converters. Technically, these modules are made of different materials and among them, dielectric materials are organic and inorganic. Organic insulators (gels) are used to avoid corona discharges in the vicinity of connecting wires and high voltage dies (diodes and transistors) and to protect them from moisture and contaminants. Inorganic insulators (ceramic substrates) are used to insulate the high voltage which dies from the grounded elements and to transfer heat to the heat sink. Despite being used since the late 90s, there is a lack of fundamental knowledge about the electrical properties of these substrates. Consequently, manufacturers tend to assure the reliability by over sizing them. As there are no clear rules for how to do that, failures occur, leading to the converter shutdown. The aim of this study is to bring new information about the understanding of the dielectric strength of ceramic materials used in these modules. We have focused our work on the correlation between the mechanical and the dielectric properties of ceramics by using relevant experiments. We provide new information about the impact of existing cracks on the ceramic dielectric failure, according to the electromechanical breakdown model. Our conclusions bring crucial information about the precautions to be taken during manufacturing and implementation of these substrates in power modules to reduce the likelihood of the particular causes of failure.

关键词： High Voltage Power Module Ceramic Substrate Dielectric Strength Electro-Mechanical Breakdown

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Dielectric Properties of Colossal Permittivity Materials： An Update

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Journal of Energy and Power Engineering 2013年第4期7卷 726-732页

作者： Chafe Cheballah zarel valdez-nava Lionel Laudebat Thierry Lebey Pierre Bidan Sombel Diaham Sophie Guillemet-Fritsch LAPLACE (Laboratoire Plasma et Conversion d'Energie) Universite de Toulouse Toulouse 9 F-31062 France CNRS (Centre National de la Recherche Scientifique) LAPLACE Toulouse F-31062 France Centre Universitaire Jean-Frangois Champollion Albi 81012 France Institut Carnot CIRIMA T (Centre Inter-universitaire de Recherche et d 'lngdnierie des Matdriaux) Universitd Paul Sabatier Toulouse 9 31062 France

During the last 10 years, a lot of interests have been devoted to the so-called CDC (colossal dielectric constant) materials. The first materials exhibiting this behavior were the perovskite-based ceramics on the CCTO (CaCu3Ti4O12) composition. Relative dielectric permittivity can attain values up to (or even larger than) 105. Nevertheless, their dielectric losses are too high, the lower values ranging 10%, in a narrow frequency range, thus limiting their applications. The underlying physical mechanisms at the origin of the CDC are still under study. The analysis of broadband impedance spectroscopy measurements leads most of the authors to propose an interfacial polarization mechanism (at the electrodes or at internal barriers), there is a limited number of complementary electrical characterization techniques, which, up to now, comfort the proposed interfacial polarization mechanisms. In the present work, I-V and time-domain polarization are used to characterize these materials. One of the main results is the observation of a non-symmetrical response of these materials related to the direction of the polarization. These results are observed for both macroscopic level on bulk polycrystalline material and within individual grains of the same samples. These results do not fit current accepted models for polarization for CDC materials.

关键词：相对介电常数材料表介电性能疾病预防控制中心极化机制偏振方向介电损耗数值范围

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