公开(公告)号：US20170214310A1

公开(公告)日：2017-07-27

申请号：US15125325

申请日：2014-03-19

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Di ZHANG ,  Luis Jose GARCES ,  Andrew Allen ROCKHILL

IPC: H02M1/08 ,  H02M7/539 ,  H02M7/525 ,  H02M7/155 ,  H02M7/217

CPC classification number: H02M1/083 ,  H02M7/1557 ,  H02M7/217 ,  H02M7/487 ,  H02M7/5152 ,  H02M7/525 ,  H02M7/539 ,  H02M7/7575 ,  H02M2007/4835 ,  Y02E60/60

Abstract: A method for power conversion includes coupling a first string to a second string via a first connecting node and a second connecting node to form at least one leg of a power converter. The first string is operatively coupled across a first bus and a second bus and comprises a first branch and a second branch coupled via a third connecting node. The first branch and the second branch include a plurality of controllable semiconductor switches. Furthermore, the second string comprises a first chain link and a second chain link coupled via an alternating current phase bus and includes a plurality of switching units. The first chain link and/or the second chain link are controlled to generate a negative voltage across at least one of the plurality of controllable semiconductor switches during a switch turn off process.