Electric power conversion device, compressor motor with the device, and air conditioner with the motor
US8305020B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 19, 2009 |
| Grant date | Nov 6, 2012 |
| Priority date | — |
| Expiry date | Apr 10, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/5395
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The device is provided with an electric power conversion circuit including switching elements for converting a DC electric power to an AC electric power, a load connected to an output side of the electric power conversion circuit, means for detecting a current flowing through a DC side in the electric power conversion circuit, a voltage command value preparing means for controlling the operation of the switching elements in the electric power conversion circuit and a wire breaking detecting means. The wire breaking detection means judges a wire breaking in the load or an abnormality of any of the switching elements in the electric power conversion circuit by making use of a DC current detection value in a period when a current of maximum voltage phase or of voltage minimum phase of the electric power conversion circuit is flowing in a DC current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.