Accession Number : ADA189985

Title :   Advanced Capacitor Development.

Descriptive Note : Interim rept. Oct 84-Apr 86,

Corporate Author : HUGHES AIRCRAFT CO EL SEGUNDO CA

Personal Author(s) : Buritz, Robert S

PDF Url : ADA189985

Report Date : Jan 1987

Pagination or Media Count : 158

Abstract : This document describes the technical approach taken by Hughes Aircraft COmpany for the development and testing of ac filter capacitors for airborne applications which will have a higher operating temperature than presently available. Successful completion of this program will result in improved lightweight, highly reliable filter capacitors that will operate at ambient temperatures exceeding 200 C. By providing capacitors that will operate in a higher temperature environment the study will significantly advance the state of the art in capacitor technology. Two problems faced in achieving higher operating temperatures are the temperature limitation of the dielectric materials and thermal management of the heat generated. Failures are usually caused by the dissipation of relatively large amounts of power in a poorly cooled volume. These failures can take the form of thermal runaway, insulation failure because of very great local hot-spot temperatures, and excessive thermal expansion. Because the thermal properties of films available for capacitor use range from about 115 C to more than 450 C, operating temperatures up to 300 to 400 C appear to be feasible. Since these numbers far exceed operating temperatures reported in the literature, the question arises as to the reason for the large difference.

Descriptors :   *CAPACITORS, *DIELECTRICS, AIRBORNE, AIRCRAFT INDUSTRY, ALTERNATING CURRENT, COOLING, FAILURE, FILMS, FILTERS, INSULATION, LIMITATIONS, MANAGEMENT, METHODOLOGY, RELIABILITY, TEMPERATURE, TEMPERATURE CONTROL, THERMAL EXPANSION, VOLUME

Subject Categories : Electrical and Electronic Equipment
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE