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:
Jan. 01, 2008
Filed:
Mar. 10, 2004
Applicants:
Mark Muenzer, Soest, DE;
Reinhold Bayerer, Warstein, DE;
Peter Kanschat, Bad Sassendorf, DE;
Inventors:
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H 9/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
In order to limit an overvoltage at a parallel circuit of IGBT () and freewheeling diode (), an undesirable current spike is used to switch on the intrinsically turned-off IGBT (') during the presence of the current spike precisely to an extent such that a current which counteracts the overvoltage arises in the IGBT/freewheeling diode pair. The oppositely acting current reduces the current gradient in leakage inductances (L) and reduces the undesirable induced overvoltages.