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. 24, 1990
Filed:
Dec. 08, 1988
Applicant:
Inventor:
Michael Peppel, Weinheim, DE;
Assignee:
BBC Brown Boveri AG, Baden, CH;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ; H02H / ;
U.S. Cl.
CPC ...
361 93 ; 361101 ; 361 87 ; 363 50 ; 363 57 ;
Abstract
A method for protecting the gate unit for a GTO thyristor includes predetermining a characteristic curve as a time function adapted both to the maximum load capacity possible for a brief time and to the long-term load capacity of a controllable electronic switch of the gate unit connected to the GTO thyristor. The voltage dropping at the electronic switch is detected and compared with the predetermined characteristic curve. The electronic switch is blocked as soon as the detected switching voltage exceeds the predetermined characteristic curve. An erase pulse switches off the GTO thyristor with the controllable electronic switch.