Method and system for determining the orientation of magnetic fields by means of GMR sensors
US6882146B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 2001 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Aug 11, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y25/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method and a system for determining the orientation of an external magnetic field by means of giant magneto-resistor (GMR) sensors. A sensor circuit is provided with two or more sub-circuits each having two GMR sensors connected in series. Three respective sensor voltages are obtained and a scaling factor is determined from differences in these voltages. An external magnetic field orientation is determined based on a scaling factor applied to the difference voltages. The inventive method enables signals from the GRM sensors to be reprocessed easily in order to compensate the temperature dependence of the signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.