Direct-current fan control chip
US9957967B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2015 |
| Grant date | May 1, 2018 |
| Priority date | — |
| Expiry date | Apr 13, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2224/48145
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A direct-current fan control chip comprises a magnetoresistive sensor, a controller, a driver and a substrate. The magnetoresistive sensor, the controller and the driver are integrated on the substrate. The sensing direction of the magnetoresistive sensor is perpendicular to or parallel to the surface of the direct-current fan control chip. The magnetoresistive sensor provides the controller with a rotor position signal, a rotor speed signal, and rotor a rotation direction signal for the controller. The controller outputs a control signal to the driver according to the received signals. After receiving the control signals, the driver outputs a drive signal. This control chip has the advantages of good temperature stability, good frequency response and so on.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.