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:
Mar. 03, 2009
Filed:
Dec. 15, 2006
Christian Stulz, Zürich, CH;
Christoph Eichler, Untersiggenthal, CH;
Erich Suter, Baden, CH;
Adrian Zuckerberger, Untersiggenthal, CH;
Pieder Jörg, Domat/Ems, CH;
Thomas Berner, Waldshut-Tiengen, DE;
Christian Stulz, Zürich, CH;
Christoph Eichler, Untersiggenthal, CH;
Erich Suter, Baden, CH;
Adrian Zuckerberger, Untersiggenthal, CH;
Pieder Jörg, Domat/Ems, CH;
Thomas Berner, Waldshut-Tiengen, DE;
ABB Schweiz AG, Baden, CH;
Abstract
A polyphase converter circuit having p≧3 phases (R, Y, B) and a converter circuit element provided for each phase (R, Y, B) is specified, each converter circuit element having a rectifier unit, a DC voltage circuit which is connected to the rectifier unit and an inverter unit which is connected to the DC voltage circuit. In addition, a first AC voltage output of each inverter unit forms a phase connection, and second AC voltage outputs of the inverter units are star-connected. In order to produce harmonics which are as low as possible with respect to the fundamental of the voltage and the current of an electrical AC voltage system which is connected on the input side to the converter circuit, n transformers are provided, each having a primary winding and m three-phase secondary windings, where n≧2 and m≧3. Furthermore, p sets of secondary windings are provided, each set of secondary windings being formed by in each case three-phase secondary windings of each transformer, and each set of secondary windings with the associated secondary windings being connected to the rectifier unit of a respective converter circuit element.