Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1991-07-17
1992-08-04
Ro, Bentsu
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
388937, H05K 118
Patent
active
051364697
ABSTRACT:
A compact, hermetically sealed, heat dissipating electric power unit comprises a P.C. board having a hole therethrough. A semiconductor electric power control device fits loosely in the hole. A backer of heat and electric current conductive material is bonded in heat and electric current conductive contact (1) with the P.C. board around the perimeter of the hole to hermetically seal the corresponding end of the hole and (2) with an opposed first electrode of the device, the backer acting as an electric current path and at least part of a heat sink for the device, the backer and P.C. board having similar thermal expansion coefficients so as to maintain the hermetic seal. An electrically conductive ground ring is electrically conductively fixed on the other face of the P.C. board and is electrically connected to the second electrode of the device and acts as a further electric current path. A cover of ceramic material has a thermal expansion coefficient similar to that of the core. The cover loosely overlies the device and has a perimeter portion sealed to the P.C. board to form therewith and with the backer a hermetically sealed chamber containing the device.
REFERENCES:
patent: 4758927 (1988-07-01), Berg
patent: 4847731 (1989-07-01), Smolley
patent: 4923404 (1990-05-01), Redmond et al.
patent: 4999740 (1991-03-01), Ilardi et al.
patent: 5003429 (1991-03-01), Baker et al.
Data sheets published by Siliconix Incorporated, pp. 4-343 and 8-1.
Carusillo Steven J.
Izenbaard John
Robertson Ralph S.
Ro Bentsu
Stryker Corporation
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