公开(公告)号：US20240305216A1

公开(公告)日：2024-09-12

申请号：US18599360

申请日：2024-03-08

Applicant: ABB Schweiz AG

Inventor： Veli-Matti Leppanen ,  Peter Muszynski ,  Tero Viitanen

IPC: H02M7/493 ,  H02M1/00 ,  H02M7/521

CPC classification number: H02M7/493 ,  H02M1/0009 ,  H02M7/521

Abstract: A power inverter system includes switching mode inverter legs connected in parallel between a common DC input and, via leg output inductors, a common phase output to feed a phase output current to a common load. The commutations of the parallel-connected inverter legs are initiated by essentially simultaneous commutation commands. The leg output current is sensed before and after a commutation in each of the parallel-connected inverter legs to obtain a pre-commutation current value and a post-commutation current value. Alternatively, a voltage pulse over the leg output inductor is sensed in each of the parallel-connected inverter legs during the commutation. A current sharing between the parallel-connected inverter legs is balanced by means of adjusting switching instants of main switches of the parallel-connected inverter legs for subsequent commutation autonomously in each of the parallel-connected inverter legs based on a difference between the pre-commutation and the post-commutation current values or based on the sensed voltage pulse of the respective parallel-connected inverter leg.

公开(公告)号：US20170099019A1

公开(公告)日：2017-04-06

申请号：US15122854

申请日：2015-03-31

Applicant: ABB SCHWEIZ AG

Inventor： Sjoerd Bosga ,  Veli-Matti Leppanen ,  Mehanathan Pathmanathan ,  Robert Chin ,  Yujing Liu

IPC: H02P6/15

CPC classification number: H02P6/15 ,  H02P6/26

Abstract: A commutation circuit includes a coil connected to an H bridge, the H bridge including four main switches for reversing polarity and a resulting coil current in the coil. The commutation circuit further includes a voltage source configured to generate a bypass current, and at least one auxiliary switch for controlling the bypass current to thereby decrease a switch current through at least one of the main switches. By generating an appropriate bypass current with help of a voltage source, a switch current through a desired main switch in a leading state can be decreased and eventually brought to zero. Zero current in its turn enables the use of thyristors as main switches as it results in the thyristors to be turned off automatically. Furthermore, decreased switch current at the switching moment reduces switching losses even in different types of switches such as GTOs and IGBTs.