Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1992-12-07
1994-07-05
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361103, 361111, H02H 904
Patent
active
053273184
ABSTRACT:
A surge protection device to protect telecommunication equipment coupled to telephone lines is shown having in a first embodiment three cells with each cell having a semiconductor element with a reverse breakdown PN junction mounted on a heat sink. The device includes a lead frame having a first pair of leads formed with a platform raised out of the plane of the remainder of the lead frame to provide suitable clearance relative to the semiconducting elements and each platform has a finger extending downwardly into engagement with a top electrode of a respective semiconducting element and is soldered thereto. A second lead lies in the plane of the lead frame and is soldered to a first heat sink plate mounting two semiconducting elements and another finger extending from one of the platforms is soldered to a second heat sink plate mounting the third semiconducting element. The heat sinks, semiconducting elements and portions of the leads are encapsulated in thermally conductive, electrically insulative epoxy. The device, when subjected to excessive current and voltage conditions, is adapted to fail closed. A second embodiment has two cells mounted on a single heat sink plate mounted in the same manner as in the first embodiment.
REFERENCES:
patent: 5130882 (1992-07-01), Hilland
patent: 5164877 (1992-11-01), Furahata et al.
Baskin Gennady
Candelet Ronald J.
Popat Pravin N.
Tonnies Gary L.
Unterweger Diethard
Baumann Russell E.
Deboer Todd E.
Donaldson Richard L.
Grossman Rene E.
Texas Instruments Incorporated
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