Block commutation to reduce inverter losses for BLDC drives
US10374533B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2017 |
| Grant date | Aug 6, 2019 |
| Priority date | — |
| Expiry date | Nov 21, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Techniques to sense the direction of current through the power transistor of an inverter drive circuit and the position of the rotor for a brushless direct current (BLDC) motor. During the time demagnetizing current flows, the power transistor is turned ON, directing the demagnetizing current through the lower impedance transistor channel rather than through the body diode. Directing current to the transistor channel may reduce the diode losses in the power transistors, thereby reducing the overall power losses. In other examples, the low side as well as the high side power transistor may be turned on during the time the demagnetizing current flows through the given power transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.