Method and device for controlling an electric load connected to a multiphase switchable DC/AC frequency convertor
US6864660B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 2003 |
| Grant date | Mar 8, 2005 |
| Priority date | — |
| Expiry date | Jun 11, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/53876
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and a device for realizing an effective value of a quantity to be varied in an electrical load connected to a multi-phase switchable DC/AC frequency convertor comprising a plurality of controllable switches. The value is realized by varying a current or a voltage delivered by the DC/AC frequency convertor through suitable switching of the switches thereof, and wherein the quantity exhibits a load angle which, averaged in time, leads or lags the voltage or current being delivered. The method and/or the device is arranged for carrying out the steps comprising the defining of a dead zone having dimensions that are representative of an allowable amplitude and phase angle deviation in the quantity to be realized; the orienting of the dead zone with respect to the voltage or current delivered by the DC/AC frequency convertor by rotating the dead zone through the load angle in the direction of the delivered voltage or current; and the switching of one or more of the switches on the basis of the manner in which the deviation in the quantity to be realized extends beyond the dead zone, for the purpose of realizing the quantity during operation with an amplitude and phase deviation …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.