Current detecting device using ferromagnetic magnetoresistance element
US4937521A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1988 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Jul 7, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R17/105
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A current detecting device comprises a substrate, a magnetism sensing member made of ferromagnetic magnetoresistance element, an insulating member, and a conducting member, and these members are formed by a photolithography technique such that the magnetism sensing member is electrically isolated from the conducting member by the insulating member. When a current flows into the conducting member, the magnetism sensing member responds to a magnetic field generated by the current. At this time, the resistance of the magnetism sensing member changes due to a magnetoresistance effect in accordance with the intensity of the current. Therefore, the current can be measured by detecting the resistance change. In such a current detecting device, there is no reactance component thereby achieving high sensitivity when detecting the current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.