Thyristor with integrated power supply for an associated circuit and method for manufacture thereof
AssigneeSiemens Aktiengesellshaft
InventorRoland Sittig
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Abstract
A thyristor having a p-n-p-n semiconductor construction has a shoulder of the n-base extending through the p-base to an exterior surface of the body of the thyristor and is connected to an associated circuit to supply the circuit with operating current. The shoulder has a first part at the boundary surface of the body and a second part with smaller cross-sectional dimensions, connected between the first part and the n-base. The cross-sectional dimensions of the conductive connection between the shoulder and the external circuit are less than the corresponding dimensions of the first part, such that the conductive coating is shielded from the space charge zone adjacent the second part.
Claims7
A thyristor having a semiconductor body with an n-emitter, a cathode electrode in contact with said n-emitter, a p-base, an n-base adjacent said p-base, and a p-emitter adjacent said n-base, and an anode electrode in contact with said p-emitter, said n-base having a shoulder penetrating through said p-base up to a boundary surface at the cathode side of said p-base, a conductive coating on said shoulder at said boundary surface, a circuit unit connected to said conductive coating for receiving an operating current from said shoulder, said shoulder comprising a first part at said boundary surface and carrying said conductive coating and a second part interconnected between said first part and said n-base, the cross-sectional dimensions of said first part being greater than the corresponding dimensions of said conductive coating and greater than the corresponding dimensions of said second part, whereby said conductive coating is isolated from the space charge zone in the area of said first and second parts.
Dependencies are inferred from the claim text.