Abstract 1,088,139. Semi-conductor devices. MOTOROLA Inc. June 18, 1965 [July 17, 1964], No. 25926/65. Heading H1K. A high current rectifier consists of a plurality of matched solid state rectifier cells each having one terminal in the form of a cap or can 12 and one in the form of a wire 15, the cells being connected in parallel by soldering between two terminal plates 14 and 17. Each cell (Figs. 2 and 3, not shown) consists of a diffused junction silicon disc coated with gold-over-nickel and soldered between copper discs which are in turn soldered to the steel can 12 and the wire 15 respectively, the solder being an alloy of silver, indium and lead. The cells are sealed by cover-plates welded to the can and contain calcium aluminium silicate to absorb moisture and deleterious gases. The cells are mass produced, are tested after encapsulation and sorted into matched groups. A matched group is then soldered between the plates 14 and 17-by discs 50 and rings 60 of a silver-tin alloy of lower melting point than the solder in the cells-with the caps 12 in the recesses 51 and the wires 15 in the holes 58. The assembled device is potted, e.g. in epoxy resin, the lug 19 providing one common terminal and the screw shown, or equivalent means, carried by the base-plate 14 used to connect the device to a heat sink providing the other terminal.
A SEMICONDUCTOR RECTIFIER COMPRISING A PLURALITY OF MATCHED UNIT CELLS, SAID UNIT CELLS EACH HAVING FOR ELECTRICAL CONNECTIONS A CAP AND AN EXTENDING WIRE TERMINAL, A METAL BASE WITH A PLURALITY OF RECESSES INTO WHICH ARE SOLDERED SAID CAPS OF SAID UNIT CELLS, SAID METAL BASE EQUIPPED WITH A MOUNTING MEANS TO FACILITATE MAKING ELECTRICAL AND THERMAL CONNECTION TO SAID BASE, A METAL CONNECTOR WITH APERTURES RESPECTIVELY ALIGNED WITH SAID RECESSES AND INTO WHICH ARE SOLDERED SAID WIRE TERMINALS, AND A TERMINAL MEANS OTHER THAN THE SAID WIRE TERMINALS OF SAID UNIT CELLS ATTACHED TO SAID CONNECTOR FOR MAKING ELECTRICAL CONNECTION TO SAID CONNECTOR.
Claim 2
Dependent Claim
104 words
A SEMICONDUCTOR RECTIFIER COMPRISING A PLURALITY OF MATCHED UNIT CELLS, SAID UNIT CELLS EACH HAVING FOR ELECTRICAL CONNECTIONS A CAP AND AN EXTENDING WIRE TERMINAL, A METAL BASE WITH A PLURALITY OF RECESSES INTO WHICH ARE SOLDERED SAID CAPS OF SAID UNIT CELLS, SAID METAL BASE EQUIPPED WITH A MOUNTING MEANS TO FACILITATE MAKING ELECTRICAL AND THERMAL CONNECTION TO SAID BASE, A METAL CONNECTOR WITH APERTURES RESPECTIVELY ALIGNED WITH SAID RECESSES AND INTO WHICH ARE SOLDERED SAID WIRE TERMINALS, AND A TERMINAL MEANS OTHER THAN THE SAID WIRE TERMINALS OF SAID UNIT CELLS ATTACHED TO SAID CONNECTOR FOR MAKING ELECTRICAL CONNECTION TO SAID CONNECTOR.