The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 2009
Filed:
Feb. 01, 2008
Luc Meysenc, Saint Egreve, FR;
Philippe Stefanutti, Choisy, FR;
Philippe Noisette, Sergy, FR;
Nicolas Hugo, Geneva, CH;
Alper Akdag, Umiken, CH;
Luc Meysenc, Saint Egreve, FR;
Philippe Stefanutti, Choisy, FR;
Philippe Noisette, Sergy, FR;
Nicolas Hugo, Geneva, CH;
Alper Akdag, Umiken, CH;
ABB Research Ltd, Zurich, CH;
Abstract
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.