Motor drive device and electronic device using the same
US7848066B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 2006 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Dec 1, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/032
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor drive device includes: chopping signal generation means for generating a chopping signal Sa when drive current of a driver has reached a first threshold value; chopping signal cut-off means for cutting off the chopping signal Sa when the drive current has reached a second threshold value which is greater than the first threshold value; and overcurrent protection means for generating an overcurrent protection signal Se when the drive current has reached a third threshold value which is greater than the first threshold value and its continuation time has reached a predetermined threshold value time. Thus it is possible to simultaneously obtain the constant current chopping function and the overcurrent protection function and to improve its reliability and safety.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.