Zero-crossing correction in sinusoidally commutated motors
US7161819B2 · kind B2 · utility
1Cited by
12References
12Claims
0Family size
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Key dates
| Filing date | Jul 22, 2004 |
| Grant date | Jan 9, 2007 |
| Priority date | — |
| Expiry date | Jun 23, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/53873
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for controlling sinusoidal currents in inductive loads during zero-crossing to reduce distortion. The apparatus and method utilizes first and second PWM signals during a single PWM cycle to apply opposite voltage signals to obtain a net desired voltage across the inductive load. The voltage applied to the load is compared with a threshold and, when the applied voltage is greater than the threshold, normal PWM signals are applied to the load, and when the applied voltage is less than the threshold, an adjusted voltage formed of first and second PWM signals is applied to the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.