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:
Aug. 10, 1976
Filed:
May. 15, 1975
Applicant:
Inventor:
Wolfgang Timpe, Erlangen, DT;
Assignee:
Siemens Aktiengesellschaft, Munich, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
321 13 ; 2191 / ; 321 16 ; 330 86 ;
Abstract
The invention concerns a circuit arrangement for use with an electric melting furnace of a type which is fed by a converter, the latter converter being equipped with thyristors and controlled by a control unit and a series-connected current regulator. More specifically, in accord with the invention, the circuit arrangement is provided with monitoring circuits for monitoring the operation of the thyristors. These monitoring circuits, in turn, generate signals which control switches for selectively short-circuiting the feedback resistors of the regulator.