Control device
US6882121B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2004 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | May 25, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P5/68
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In order to improve a control device for operating a load circuit having at least one electric motor, this control device comprising a control stage which generates a pulse width modulated control signal, a power stage supplying the load circuit and having an electronic switch activated by the pulse width modulated control signal, a freewheeling element connected in parallel to the load circuit and a blocking monitoring means which generates a measurement switch-off interval by suppressing at least one switch-on interval of the pulse width modulated control signal, monitors the voltage in the load circuit during the measurement switch-off interval, compares it to a limit value and generates a blocking state signal in accordance with the comparison, in such a manner that a differentiated analysis of the voltages occurring in the measurement switch-off interval is possible it is suggested that for monitoring at least two electric motors connected in parallel in the load circuit the blocking monitoring means carry out a test run with at least one measurement cycle, in which a voltage sampling is carried out at different defined points in time after the start of at least one measuremen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.