The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 1986
Filed:
May. 18, 1983
Applicant:
Inventor:
Helmut Herberg, Munich, DE;
Assignee:
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
3072 / ; 3072 / ; 3072 / ; 307305 ; 357 234 ; 357 38 ;
Abstract
A semiconductor switch has a disconnectible thyristor, a first switching transistor connected to a lead of the thyristor and a turn-off current path which emits a control electrode of the thyristor to a terminal of the lead. Given such semiconductor switches, the critical voltage rise rate dU/dt is increased for an inhibit voltage up to which an undesired ignition of the thyristor is reliably avoided. This is achieved by providing a second switching transistor having its switching path connected in the turn-off current path. Both switching transistors are conductive in the inhibiting condition of the thyristor and form a stabilizing emitter-base short.