System for measuring electrical output or energy
US4525668A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1981 |
| Grant date | Jun 25, 1985 |
| Priority date | — |
| Expiry date | Dec 18, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C11/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an apparatus for the measurement of electrical power, including a multiplier which receives on an input thereof an electrical signal proportional to the voltage component of the electrical power, and which is subjected to an external magnetic field proportional to the current component of the electrical power, an auxiliary magnetic field is applied to the multiplier. The multiplier is a Wheatstone bridge including four ferromagnetic and magnetoresistive thin films, and the magnetic fields have a direction along the direction of the hard magnetic axes of each of the thin films. The thin films are so positioned that the magnetization of two electrically oppositely disposed thin films resulting from the application of the external magnetic field thereto is rotated in a direction opposite to that of the correspondingly resulting magnetization of the remaining thin films, following application of the auxiliary magnetic field to the films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.