Patent · US Expired

Circuit arrangement with a number of frequency converters, particularly Y-connected direct frequency converters

US4008428A · kind A · utility

8Cited by

3References

1Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Hermann Waldmann · Radebeul, DE
Manfred Weibelzahl · Fairview Avenue, DE

Key dates

Filing date	Jan 7, 1976
Grant date	Feb 15, 1977
Priority date	—
Expiry date	Jan 7, 1996

Classification

Technology area (CPC H)Electricity
CPC primaryH02M5/271
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit arrangement is disclosed having an odd number of Y-connected frequency converters. The control units of the frequency converters are associated with current regulators, all of which are addressed by an additional common reference value. In accord with the invention, the aforesaid reference value is derived by generating a difference voltage corresponding to the difference of the voltages at the neutral point of the frequency converter circuit and the neutral point of the load. This difference voltage is then passed through a delay member whose time constant corresponds to the time constant of the load to develop the reference value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.