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:
May. 18, 1993
Filed:
Dec. 04, 1990
Applicant:
Inventors:
Eric Baudelot, Erlangen, DE;
Hans Laber, Erlangen-Bruck, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 91 ; 361 18 ; 361 56 ;
Abstract
Protecting a gate fully controlled thyristor that is controlled by a drive circuit including a turn-on circuit and a turn-off circuit against overvoltage, is accomplished by monitoring the anode voltage of said gate fully controlled thyristor relative to its cathode voltage. Upon overshoot of the voltage of a predetermined limit, a control signal is generated. This control signal causes the negative voltage source that is connected at the gate of the gate fully controlled thyristor to turn off. The gate fully controlled thyristor is then turned on by means of the turn-on circuit.