Motor control device, air conditioner, washing machine and refrigerator
US9580858B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 2015 |
| Grant date | Feb 28, 2017 |
| Priority date | — |
| Expiry date | Sep 24, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/53873
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor control device driving a motor via an inverter circuit includes a current sensing element, a PWM signal generation unit and a current detection unit. The PWM signal generation unit is configured to generate three-phase PWM signals in a manner such that the current detection unit is capable of detecting two-phase currents at two fixed time-points within a carrier period of the PWM signal. A duty of one of the three-phase PWM signals is increased/decreased to both phase lag side and phase lead side with reference to any phase. A duty of another phase PWM signal is increased/decreased to both phase lag side and phase lead side with reference to any phase away one half of the carrier period from the reference phase. A duty of the other phase PWM signal is increased/decreased to either phase lag side or phase lead side with reference to any phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.