Abb Research Ltd.

Abb Schweiz Ag

Alper Akdag

Luc Meysenc

Pieder Joerg

Philippe Noisette

Philippe Stefanutti

Nicolas Hugo

Amina Hamidi

A power supply system for railway traction applications including a multilevel AC/DC converter. The converter comprises a plurality of series-connected single-stage cycloconverters or direct AC frequency converters connected between an AC supply line and a traction transformer. The transformer is operable at a transformer nominal frequency below 3 kHz and above the AC line frequency. On the secondary side of the transformer, more than one parallel-connected secondary converter are provided and connected to a DC link. In case of failure of one of the secondary converters, the multilevel AC/DC converter may continue to operate with reduced power delivered by the remaining operating levels.

Multilevel AC/DC converter for traction applications

A signal transformer having a primary limb and a first secondary limb is specified, a primary winding at least partly enclosing the primary limb and a secondary winding at least partly enclosing the first secondary limb and the primary limb being connected to the first secondary limb. Furthermore, 2n+1 additional secondary limbs are provided, where n=0, 1, 2, 3, . . . , and the additional secondary limbs are connected to the primary limb and the first secondary limb. At least one secondary winding is in each case provided for the additional secondary limbs and for the first secondary limb, the secondary winding at least partly enclosing the respective secondary limb. Moreover, a control winding is provided for each secondary limb, said control winding at least partly enclosing the respective secondary limb. Furthermore, a method for operating such a signal transformer and a driver circuit having such a signal transformer are specified.

Signal transformer and method for operating such a signal transformer

The power module housing comprises two electrically insulating housing elements ( ) that are attached to each other. A first of said housing elements ( ) comprises at least two openings ( ) for electric power terminals ( ) and a slot-like recess ( ). Between the openings ( ) three insulating walls ( ) are arranged on and perpendicular to a surface of the housing. One insulating wall ( ) is part of a second of said housing elements ( ) and is inserted into the recess ( ) in said first housing element ( ), while an at least one second of said insulating walls ( ) is part of the first housing element ( ). The insulating walls between the openings for the power terminals allow a compact arrangement of the terminals.

Module housing and power semiconductor module

Growing community of inventors

Baden-Rütihof, Switzerland

Alper Akdag