Current measuring device with hall sensors

US12174224B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Roland Weiss · Iserlohn, DE
• Karl Fleisch · Erlangen, DE
• Ingolf Hoffmann · Herzogenaurach, DE
• Alexander Itzke · Nuremberg, DE
• Anja Schnieders · Erlangen, DE
• Abderrahim Chahid · Hemhofen, DE
• Florian Zapf · Gersthofen, DE

Key dates

• Filing date: Jul 14, 2021
• Grant date: Dec 24, 2024
• Expiry date: Jul 14, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R19/10
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A current measuring device for generating an output current proportional to a current to be measured includes at least two Hall sensors arranged on a circular path and oriented identically in relation to a center point. The current measuring device includes an adding circuit summing measurement signals of the Hall sensors, a subtracting circuit for eliminating an offset, a voltage-controlled current source, and a current supply with a toroidal coil having a paramagnetic and/or diamagnetic core and a DC/DC converter supplying the Hall sensors. In a method for measuring a current, a current measuring device has an adding circuit for adding the measurement signals of the Hall sensors and generating a voltage proportional to the current to be measured. An offset of the voltage is subtracted by a subtracting circuit, generating an output current with a predefined transformation ratio relative to the measured current.