Patent · US Expired

Method and circuit arrangement for limiting an overvoltage

US7315439B2 · kind B2 · utility

8Cited by

8References

9Claims

0Family size

Assignee

EUPEC Europaeische Gesellschaft fur Leistungshalbleiter mbH · DE

Inventors

Mark Nils Muenzer · Neubiberg, DE
Reinhold Bayerer · Warstein, DE
Peter Kanschat · Soest, DE

Key dates

Filing date	Mar 10, 2004
Grant date	Jan 1, 2008
Priority date	—
Expiry date	Nov 9, 2024

Classification

Technology area (CPC H)Electricity
CPC primaryH02M1/088
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In order to limit an overvoltage at a parallel circuit of IGBT (3) and freewheeling diode (7), an undesirable current spike is used to switch on the intrinsically turned-off IGBT (3′) 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 (Lσ) and reduces the undesirable induced overvoltages.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.