© 2021 UNIVERSITY OF ZILINA COMMUNICATIONS 23 (1) C1-C6 ORIGINAL RESEARCH ARTICLE Electrical Engineering in Transport C1 Resume The paper proposes a design and construction of a special plated capacitor exhibiting very good high-frequency characteristics. The capacitor is designed to minimize the parasitic parameters like ESR (equivalent series resistance) and ESL (equivalent series inductance) and to be suitable for power industry applications. The paper describes the fabrication process and discusses technical issues related to technology of manufacturing and assembling. It also provides an experimental verifcation and the quality evaluation based on frequency characteristics compared to existing commercial high-quality capacitor. DESIGN AND CONSTRUCTION OF HIGH-QUALITY CAPACITOR FOR HIGH FREQUENCY AND POWER APPLICATION Martin Zavřel 1 , Vladimír Kindl 1, *, Tomáš Kavalír 2 , Pavel Drábek 1 1 Regional Innovation Centre for Electrical Engineering, Faculty of Electrical Engineering, University of West Bohemia, Pilsen, Czech Republic 2 Regional Technological Institute, Faculty of Mechanical Engineering, University of West Bohemia, Pilsen, Czech Republic *E-mail of corresponding author: vkindl@kev.zcu.cz Article info Received 26 May 2020 Accepted 8 June 2020 Online 27 October 2020 Keywords: capacitor, high quality, high power, high frequency, parasitics, construction design, testing Available online: https://doi.org/10.26552/com.C.2021.1.C1-C6 ISSN 1335-4205 (print version) ISSN 2585-7878 (online version) neglecting infuence of the insulation resistance (is too high), one may write: Q f I ESR C I RC 2 2 2 1 1 m m 2 2 2 r ~ ~ = = . (1) In Equation (1), ~ represents the angular frequency of the power supply, I m is the magnitude of the current through the capacitor C and R represents its ESR. As obvious from Equation (1), the energy loss starts to dominate at higher frequencies, therefore the high Q factor capacitors must be used to prevent any performance issues. This could be achieved by special design having the ultra-low ESR and so ESL. This high-quality capacitor will fnd its purpose in any industrial-, electronics- or medicine application [14-17] that are using frequencies even higher than tens of MHz. This paper proposes a design of high-quality, high- frequency and high-power capacitor and describes step-by- step manufacturing and assembling process. The capacitor properties are compared to the equivalent high-quality capacitor available on the market [18]. 2 Design of the capacitor As mentioned in previous section, to demonstrate the quality of this design, the properties of the capacitor are compared to the existing one developed by Vishay 1 Introduction Increasing the power density of electrical passive components, such as a capacitor [1-3], inductor or resistor, incorporated into modern power systems, is a common technical goal for many power applications. Higher power density brings better material utilization, lower weight and lower equipment cost. Many power applications are using the high frequency and sometimes the resonance, e.g. wireless power transfer [4-5], high-pass, low-pass and EMI (electromagnetic interference) flters [6-7], induction heating [8-9] etc. In these applications, the compensation capacitors play a very important role, since they must carry very high electrical current and are being stressed with relatively high voltage. In that case, the quality factor (Q factor) of the capacitor is one of the most important characteristics in a power circuit design [10]. Besides the capacitance (the main parameter), the practical capacitor consists of equivalent series resistance (ESR), equivalent series inductance (ESL) and insulation resistance (R g ) [11-13]. The electrodes and the terminals of a capacitor contribute the resistive component and the inductive component, while the dielectric material contributes the insulation resistance. The ESR component causes energy loss in a form of heat and the ESL parameter creates a magnetic feld interfering with how the current rises to the peak and falls back. The Q factor then represents effciency of a given capacitor in terms of its rate of energy loss. When