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:
Mar. 09, 1976
Filed:
Sep. 26, 1974
Applicant:
Inventor:
Gerd Thiele, Erlangen, Frauenaurach, DT;
Assignee:
Siemens Aktiengesellschaft, Munich, DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ; H02H / ;
U.S. Cl.
CPC ...
317 / ; 317 / ; 317 / ; 321 11 ; 321 13 ;
Abstract
This invention concerns a protective device for at least one thyristor. Separate measuring sensors are provided for determining the thyristor parameters of current and the magnitude and rising slope of the thyristor voltage. The measuring sensors are followed by a comparison stage which compares the parameters with definite, predetermined conditions, and transmits a trigger pulse for the thyristor. With the protective device according to the invention, the thyristor can be fired by means of its control electrode during the recovery time of the thyristor, if an overvoltage occurs.