| US 7,499,297 B2 | ||
| Low-harmonics, polyphase converter circuit | ||
| Christian Stulz, Zürich (Switzerland); Christoph Eichler, Untersiggenthal (Switzerland); Erich Suter, Baden (Switzerland); Adrian Zuckerberger, Untersiggenthal (Switzerland); Pieder Jörg, Domat/Ems (Switzerland); and Thomas Berner, Waldshut-Tiengen (Germany) | ||
| Assigned to ABB Schweiz AG, Baden (Switzerland) | ||
| Filed on Dec. 15, 2006, as Appl. No. 11/639,300. | ||
| Application 11/639300 is a continuation of application No. PCT/CH2005/000083, filed on Feb. 15, 2005. | ||
| Claims priority of application No. 04405389 (EP), filed on Jun. 23, 2004. | ||
| Prior Publication US 2007/0153555 A1, Jul. 05, 2007 | ||
| Int. Cl. H02M 5/458 (2006.01) | ||
| U.S. Cl. 363—37 [363/65] | 19 Claims |
| 1. A polyphase converter circuit having p≧3 phases (R, Y, B) and a converter circuit element provided for each phase (R, Y,
B), each converter circuit element having a single 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,
and a first AC voltage output of each inverter unit forming a phase connection, and second AC voltage outputs of the inverter
units being star-connected,
wherein n transformers are provided, each having a primary winding and m three-phase secondary windings, where n≧2 and m≧3,
wherein 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
wherein each set of secondary windings with the associated secondary windings is connected to the rectifier unit of a respective
converter circuit element.
|