Measurement of the current of a frequency converter
US7742321B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2007 |
| Grant date | Jun 22, 2010 |
| Priority date | — |
| Expiry date | Mar 18, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/5395
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and an apparatus for measuring the output currents of a frequency converter, preferably a vector-controlled frequency converter, which comprises a mains bridge (10) connectable to an alternating-current network and a load bridge (11) connectable to an alternating-current load and between these a direct-voltage intermediate circuit, by using current samples obtained from a current measuring sensor in the intermediate voltage circuit, wherein a sample is taken from the signal of the current measuring sensor substantially simultaneously with a point of change of the output voltage vector and upon the lapse of a predetermined delay after the point of change after the switching effects have settled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.