Method and related device for estimating the currents flowing in windings of a poly-phase electrical load at a certain instant
US7728538B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2008 |
| Grant date | Jun 1, 2010 |
| Priority date | — |
| Expiry date | Dec 11, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is a method of estimating values of winding currents, at an instant of a period, in a winding of a load, controlled in space vector modulation mode through symmetrical control phases. The winding is cyclically coupled between two supply lines through respective switches. A measuring device is alternately coupled to the supply lines. A current of one supply line, with anticipation smaller than or equal to half of the period with respect to the instant and chosen so the current is equal in amplitude to the winding current, and a current of the supply line with delay equal to the anticipation with respect to the instant, is measured. The winding current is estimated at the instant based upon the supply line currents. A threshold interval is fixed between consecutive switching edges of control phases of the winding and another control phase of the switching period wherein current is measured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.