Adjustable PWM method to increase low speed starting torque and inverter voltage measurement accuracy
US9318976B1 · kind B1 · utility
16Cited by
24References
20Claims
0Family size
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Key dates
| Filing date | Oct 30, 2014 |
| Grant date | Apr 19, 2016 |
| Priority date | — |
| Expiry date | Nov 21, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/017
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Methods, control apparatus and computer readable mediums are presented for controlling a switching inverter in which a controller selectively suspends PWM carrier signals to provide inverter switching control signals using zero vectors in response to a maximal pulse width value for a present PWM half cycle being greater than a threshold value, and accumulates a present output control value for individual output phases for use in a subsequent PWM half cycle for selective effective reduction in switching frequency for low-speed operation while maintaining high frequency control loop sampling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.