Design and Construction of High-Quality Capacitor for High Frequency and Power Application

Martin Zavřel,Tomáš Kavalír,Pavel Drábek,Vladimír Kindl

doi:10.26552/com.c.2021.1.c1-c6

Martin Zavřel, Tomáš Kavalír + Show 2 more

Open Access

https://doi.org/10.26552/com.c.2021.1.c1-c6

Copy DOI

Abstract

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 verification and the quality evaluation based on frequency characteristics compared to existing commercial high-quality capacitor.

Highlights

Increasing the power density of electrical passive components, such as a capacitor [1,2,3], inductor or resistor, incorporated into modern power systems, is a common technical goal for many power applications
Besides the capacitance, the practical capacitor consists of equivalent series resistance (ESR), equivalent series inductance (ESL) and insulation resistance (R ) [11,12,13]
This paper proposes a design of high-quality, highfrequency and high-power capacitor and describes step-bystep manufacturing and assembling process

Summary

Introduction

Increasing the power density of electrical passive components, such as a capacitor [1,2,3], inductor or resistor, incorporated into modern power systems, is a common technical goal for many power applications. 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) filters [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. As obvious from Equation (1), the energy loss starts to dominate at higher frequencies, 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. The capacitor properties are compared to the equivalent high-quality capacitor available on the market [18]

Design of the capacitor

Electrical parameters and dimensions

Mechanical and construction design

Soldering and surface finishing

Housing

Experimental verification