Importance

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Abstract

A high power density, low corona resistor comprises a dielectric thermally conductive substrate having upper and lower surfaces and having a resistance element mounted on the upper surface thereof. The resistance element comprises a thin film of electrically conductive material. A pair of electrical leads are electrically connected to the resistance element and extend upwardly therefrom. An electrically insulative material covers the resistance element to provide physical and structural protection to the resistance element and the pair of leads. An electrically conductive sheet is operatively secured to the lower surface of the substrate and is in intimate contact therewith so as to substantially fill any microscopic indentations in the lower surface of the substrate thereby substantially eliminating voids between the lower surface of the substrate and the conductive sheet. Means are provided for securing the substrate to a heat sink surface with the metal sheet in heat conducting contact with the heat sink surface. A modified form of the invention includes the use of a water cooling plate in the place of the metallic sheet.

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First Claim