vacuum capacitor

Abstract

A vacuum capacitor (8) is described, which has at least two electrodes (1, 2) in a vacuum dielectric (3), said electrodes being manufactured or coated with aluminum or an aluminum alloy, and the vacuum capacitor (8 ) comprises an insulating (eg ceramic) part and two or more conducting parts (4, 5).

Description

technical field [0001] The invention relates to the field of vacuum capacitors. Vacuum capacitors are well known in the art and are used in applications requiring high frequency and high power. Common applications include, for example, oscillating circuits used in high-power radio frequency transmission and high-frequency power supplies in the manufacture of semiconductor solar panels and flat panel displays. Background technique [0002] A capacitor consists of two or more conductive surfaces, commonly referred to as electrodes, separated by a dielectric medium. In the case of vacuum capacitors, the dielectric medium is vacuum. Vacuum capacitors usually require high vacuum (10 -6 Torr or better). A vacuum is maintained within an airtight enclosure, which also surrounds the electrodes. A typical case may comprise an insulating ceramic cylinder fitted with a metal ferrule fastened to the ceramic cylinder by a bonding technique which ensures a hermetic seal enabling a hig...

AI Technical Summary

Problems solved by technology

An electrode made of tungsten or molybdenum will consume more than three times the electrical energy in the form of heat compared to a similar copper electrode, and this extra heat will be conducted away through the electrode about 2.5 times less efficiently than through a copper electrode

This combination of increased heat generation and less efficient heat transfer means that the cooling requirements for electrodes made of (or coated with) tungsten or molybdenum are greatly increased

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