公开(公告)号：SE9903956D0

公开(公告)日：1999-11-02

申请号：SE9903956

申请日：1999-11-02

Applicant: ABB RESEARCH LTD

Inventor： DANIELSSON BO ,  AABERG ANDERS ,  OVREN CHRISTER ,  KRUSE LENNART ,  VALDEMARSSON STEFAN ,  BAKOWSKI MIETEK ,  BERGMAN KARL ,  BIJLENGA BO ,  HERMANSSON WILLY

IPC: H02M7/5387 ,  H02M

公开(公告)号：SE9802908D0

公开(公告)日：1998-08-31

申请号：SE9802908

申请日：1998-08-31

Applicant: ABB RESEARCH LTD

Inventor： OVREN CHRISTER ,  ASPLUND GUNNAR ,  HERMANSSON WILLY ,  DANIELSSON B ,  LUNDBERG PETER ,  AABERG ANDERS

IPC: H02H7/12 ,  H02M1/088 ,  H03K17/10 ,  H02H

Abstract: An electric circuit comprises a plurality of high power switching services connected in series and adapted to be controlled to be all conducting or blocking substantially simultaneously act together as a single switch and each holding a part of a high voltage to be held by the switch in the blocking state of the switching devices. Each switching device has an avalanche diode of SiC connected in anti-parallel therewith and adapted to start to conduct current when reverse biased as of a predetermined voltage limit for preventing that the voltage across the respective switching device exceeds such limit.