Variable pulse width modulation for reduced zero-crossing granularity in sensorless brushless direct current motors
US8278860B2 · kind B2 · utility
9Cited by
3References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 26, 2010 |
| Grant date | Oct 2, 2012 |
| Priority date | — |
| Expiry date | Apr 23, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Zero-crossing detection accuracy is enhanced in a sensorless brushless direct current (BLDC) motor by increasing the PWM drive frequency in anticipation of a zero-crossing event in any one or more commutation periods. Once a zero-crossing event is detected, the PWM frequency can go back to a lower normal operating frequency. Switching losses of the power drive transistors are thereby minimized while maintaining accurate zero-crossing detection for stable operation of the BLDC motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.