Motor driving device
US7902775B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2008 |
| Grant date | Mar 8, 2011 |
| Priority date | — |
| Expiry date | Sep 5, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An object of the present invention is to provide a motor driving device capable of outputting an accurate rotation signal while preventing a false detection of B-EMF in a position detecting comparator. The motor driving device includes an output circuit, filter circuit, comparison circuit, current zero ampere detecting circuit, position detecting circuit, sensorless drive arithmetic operation circuit, noise reduction current waveform generating circuit, signal synthesizing circuit, and output transistor control circuit, the comparison circuit including a comparator, polarity switching portion connected to a + terminal and − terminal of the comparator and signal switching portion, the comparator being structured to be able to set and release an offset having a predetermined voltage value set preliminarily.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.