Hall sensing apparatus
US4283643A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 25, 1979 |
| Grant date | Aug 11, 1981 |
| Priority date | — |
| Expiry date | May 25, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/202
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A Hall sensing apparatus having a large dynamic range is adapted for generating a current signal substantially in phase with the current in a conductor. The Hall sensing apparatus has a magnetic field concentrator assembly with oppositely disposed pick-up plates, each with a centrally attached concentrator rod for being symmetrically positioned on either side of the conductor. A Hall sensor element is wholly positioned in the space between the ends of the rods remote from the plates. A current circuit, having an externally controlled current varying device and temperature drift control device in series with a current source, provides a Hall current through the sensor element. A detection circuit, coupled across the width of the sensor element, provides an inverted and non-inverted signal in phase with the conductor current which are coupled to the inverting input of a summing amplifier. A reference voltage is then coupled to the non-inverting input of the summing amplifier to generate a dc bias offset control signal which is coupled, in a negative feedback configuration, to control the Hall current and thereby decrease the dc offset bias.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.