Motor driving apparatus
US7612521B2 · kind B2 · utility
5Cited by
1References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 9, 2005 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Jan 21, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/29
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a fan motor drive circuit which drives a motor based on a pulse-modulated external control signal, a temperature control signal generator generates a pulse-modulated temperature control signal whose duty ratio changes depending on temperature. A signal synthesizer synthesizes the external control signal and the temperature control signal by a logical operation. A drive controller drives the motor based on output of the signal synthesizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.