Circuit protection device with PTC device and backup fuse
AssigneeLittelfuse, Inc.
InventorsYuriy Borisovich Matus, Martin G. Pineda, Sergio Fuentes
Life of this patent
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Abstract
A circuit protection device including a positive temperature coefficient (PTC) device and a backup fuse electrically connected in series with one another, the backup fuse comprising a quantity of solder disposed on a dielectric chip and having a melting temperature that is higher than a trip temperature of the PTC device, wherein the a surface of the dielectric chip exhibits a de-wetting characteristic relative to the solder such that, when the solder is melted, the solder draws away from the surface to create a galvanic opening in the backup fuse.
Claims18
A circuit protection device comprising a positive temperature coefficient (PTC) device and a backup fuse electrically connected in series with one another, the backup fuse comprising a quantity of solder disposed on a dielectric chip and having a melting temperature that is higher than a trip temperature of the PTC device, wherein the a surface of the dielectric chip exhibits a de-wetting characteristic relative to the solder such that, when the solder is melted, the solder draws away from the surface to create a galvanic opening in the backup fuse, wherein the dielectric chip is fastened to an electrode of the PTC device by a thermally conductive medium.
A circuit protection device comprising a positive temperature coefficient (PTC) device and a backup fuse electrically connected in series with one another, the backup fuse comprising a cartridge fuse having a fusible element with a melting temperature that is higher than a trip temperature of the PTC device, wherein a fuse body of the cartridge fuse exhibits a de-wetting characteristic relative to the fusible element such that, when the fusible element is melted, the fusible element draws away from a surface of the fuse body to create a galvanic opening in the fusible element.
Dependencies are inferred from the claim text.