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This paper focuses on the study of high-capacitance embedded capacitors for power electronics applications, manufactured by the screen-printing technique. Thick film ferroelectric ceramic was printed on Ag/AlO substrates and dried at 120 °C, then a pre-treatment was applied by cold isostatic pressing (CIP) before sintering. A comparison of the physico-chemical and electrical properties of the non-CIP and CIP samples is made. The results show that the thick film samples pre-treated by CIP have higher permittivity and higher dielectric strength compared to the untreated ones. The capacitor samples with CIP pre-treatment also exhibit higher capacitances, lower parasitic equivalent series inductance and series resistance; all key intrinsic dielectric properties relevant for applications. We propose the use of this process for obtaining the embedded capacitors that allow for high-capacitance values for decoupling and filtering in power electronics applications. [ABSTRACT FROM AUTHOR]

A low-input voltage high-power realization is presented with the aim to demonstrate the feasibility and the interest of topologies using intercell transformer. They constitute a promising option to interleave converter stages, and therefore, can answer to the specifications considered in this paper. These specifications require a galvanic insulation and the chosen topology is the Intercell Transformer (ICT) flyback converter, previously proposed by the authors. In a first part, the operating principle of the ICT flyback converter is recalled. The second part presents briefly the main features of the intercell transformer design, more precisely described in a previous paper. This part includes a discussion about the choice of the cell number. The last part presents the design and the implementation of the complete flyback converter using eight cells. A preliminary work concerns the choice, the design, and the test of each cell elements, mainly the transformer and the primary switching stage. In the end, the experimental results are presented and discussed. They demonstrate the potential of this original topology that needs only one level of magnetic components. Considering the suitability of the converter interleaving for the high-power--low-voltage applications, the ICT flyback converter constitutes a good candidate in that field. [ABSTRACT FROM AUTHOR]

Analyzes the properties of multicell converters. Analysis of the different ways to introduce soft switching in multicell converters; Concept of distributing power over several switches; Description of direct ac-ac converters using the multicell approach.