Motor driving circuit and method thereof
US10439524B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2018 |
| Grant date | Oct 8, 2019 |
| Priority date | — |
| Expiry date | Aug 20, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor driving circuit includes a Hall sensor, an offset detecting circuit, a driving circuit and a back EMF zero point detector. The Hall sensor generates a Hall signal group, the offset detecting circuit detects the first phase changing point of the Hall signal group, and the driving circuit generates the initial phase changing signal in the pre-operation mode according to the Hall signal group. In the correction mode, the driving circuit stops outputting the initial phase changing signal, the back EMF zero detector detects the back EMF zero point, and outputs the back EMF zero point signal. The offset detecting circuit detects a phase difference between the first phase changing point and back EMF zero point, and determines a difference value between the phase difference and a predetermined phase difference. Then, the phase of the Hall signal group is adjusted according to the difference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.