Integrable current sensors
US5041780A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1988 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Sep 13, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/207
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A current conductor is provided with opposing notches to produce a restricted section and with magnetic flux sensors on opposite sides of the restricted current section. The flux sensors are connected to differential amplification circuitry. The restricted section increases the concentration of magnetic flux sensed, and the differential amplification circuitry eliminates the sensing of currents in external conductive paths. An electrostatic shield is provided between the shaped conductor and the magnetic flux sensors to elminate electrostatic effects on the output signal. The flux sensors and differential amplification circuitry is fabricated in an integrated circuit chip. For small currents, the shaped conductor may be deposited on the chip; otherwise a shaped conductor is formed and a mounting substrate of insulating material, such as ceramic, is used to support the integrated circuit chip on the shaped conductor with each of the two sensors centered respectively within the two opposite notches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.