Methods, systems and apparatus for detecting abnormal operation of an inverter sub-module
US7977963B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2009 |
| Grant date | Jul 12, 2011 |
| Priority date | — |
| Expiry date | Jan 4, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods and apparatus are provided for determining whether one or more inverter sub-modules of an inverter module is operating properly. Amplitude of each stator current signal is regularly measured. For each current signal, a positive counter counts a number of consecutive times the amplitude of that current signal is less than a positive current threshold, while a negative counter counts a number of consecutive times the amplitude of that current signal is greater than a negative current threshold. If the positive counter or the negative counter exceeds a maximum count, it is determined that an inverter sub-module is operating abnormally.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.