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Power Film Capacitors for DC Bus Applications

This presentation explores the state-of-the-art in metallized dielectric DC link capacitors. The discussion is based on dry constructions. The present industry demands are discussed, system level approaches for discrete versus modular capacitors, factors affecting capacitor design, and future development trends. Metallized polypropylene is discussed as the premier power film and how the film has reached its potential. The need for a dielectric... Read More

AC Film Capacitors for Inverter Output Filters

This presentation discusses AC filter capacitors used in inverter outputs. Notably the presentation concentrates on the use of metallized polypropylene capacitors of dry construction. Oil filled capacitors dominate these applications in the higher voltage and power markets generally in front-end filtering and power factor correction. However, the use of dry capacitors for inverter output filtering has increased in the medium voltage filters over... Read More

ECI High Temperature Film Capacitors

Electronic Concepts Inc. is an industry leading plastic film capacitor manufacturer incorporated in 1969. Primary markets served include military, medical, aerospace, alternative energy, traction, and industrial power conversion. Global corporation with design and manufacturing in America and Europe. Vertically integrated with: Solvent casting plant producing polymers including polycarbonate and proprietary dielectrics. Full machining capabilities... Read More

AC Filter Capacitors for PWM Inverter

The overall variable frequency drive (VFD) system relies on capacitors to control an AC induction motor properly. The VFD system includes an input sine filter, AC/DC converter, DC link, DC/AC inverter, and AC inverter output filer. Within the VFD are DC bus capacitors, located between the output of the AC/DC converter and the input to the DC/AC inverter. These high-energy capacitors store energy, smooth rectifier ripple currents, and provide “ride... Read More

The Self-Healing Affect of Metallized Capacitors

Metallized capacitors offer the advantages of volume efficiency and self-healing. Self- healing is the ability of a metallized capacitor to clear a fault area where a momentary short occurs due to dielectric breakdown under voltage. The conditions that lead to a fault vary. In the production of the dielectric film, contamination can occur or a process control problem can result in compromised dielectric strength. In most circumstances, these problems... Read More

Selecting Film Bus Link Capacitors For High Performance Inverter Applications

Abstract – For years design engineers have chosen electrolytic capacitor technology for use as the bus link capacitor on inverter designs. The main attraction has always been the low cost per farad associated with electrolytic capacitors. This paper will present a practical mathematical approach on how to properly size a bus link capacitor for a high performance hard switched DC to AC inverter using film capacitors and will show how film capacitors... Read More

A New Mitigation Strategy for Failures in Metallized Polypropylene Capacitors

Abstract Metallized film capacitors utilizing polypropylene dielectric have become the component of choice in critical applications because of their low dielectric loss and superior breakdown voltage strength. There are some concerns that in certain applications metallized polypropylene capacitors can fail in a manner such that the failure poses a hazard to the equipment and personnel. Fuseacâ„¢ is a thermal fuse technology designed to protect against... Read More

Capacitors in Series

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Capacitors in Parallel

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