Filtering choke arrangement for a frequency converter
US7839251B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2007 |
| Grant date | Nov 23, 2010 |
| Priority date | — |
| Expiry date | Mar 22, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2003/106
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Three-phase AC or two-phase DC choke arrangement of a frequency converter, in which is a magnetic core, in which are the phase-specific pillars of the AC choke arrangement or the branch-specific pillars of the DC choke arrangement (1a, 1b), around which are arranged the phase-specific windings of the AC choke arrangement or the branch-specific windings of the DC choke arrangement (Ldc1+, Ldc1−) to filter difference-mode currents, and in which an additional pillar (3) for damping common-mode currents is arranged in the magnetic core of the choke. The additional pillar (3) is arranged without the phase-specific or branch-specific windings fitted around it, in which case damping of the common-mode currents is achieved by means of the common-mode impedance formed by the windings arranged around the additional pillar and around the phase-specific or the branch-specific pillars.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.