Motor drive circuit and illumination apparatus and method
US9912269B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2014 |
| Grant date | Mar 6, 2018 |
| Priority date | — |
| Expiry date | Sep 5, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor-drive circuit includes: an output transistor configured to supply a drive current to a motor for a cooling fan; a switching-control circuit configured to control switching of the output transistor so that the motor rotates in a first direction, or rotates in a second direction opposite to the first direction; and a switching circuit configured to, when a first time has elapsed since start of rotation of the motor in the first direction, cause the switching-control circuit to start switching control so that the motor stops rotating in the first direction and thereafter rotates in the second direction, and configured to, when a second time has elapsed since start of rotation of the motor in the second direction, cause the switching-control circuit to start switching control so that the motor stops rotating in the second direction and thereafter rotates in the first direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.