Current sensor arrangement for measuring currents in a primary conductor

US8823362B2 · kind B2 · utility

Assignees

• Vacuumschmelze GmbH & Co. KG · DE
• BOSCH CORPORATION · JP

Inventors

• Ralf Koch · Eisenberg (Pfalz), DE
• Juergen Schoettle · Heubach, DE
• Marcus Bremmer · Benningen am Neckar, DE
• Jens Doeblitz · Stuttgart, DE
• Michael Wolf · Mundelsheim, DE

Key dates

• Filing date: Jun 17, 2009
• Grant date: Sep 2, 2014
• Expiry date: Jul 19, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R15/185
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and an array for measuring a primary current in a primary conductor that is magnetically coupled to a secondary conductor via a ferromagnetic core. In said method, a voltage having a specific amplitude is applied to the secondary conductor such that a secondary current flows for reversing the magnetization of the ferromagnetic core; the secondary current is measured while the magnetization of the ferromagnetic core is reversed in order to obtain a first measured value; the polarity of the voltage is reversed such that a secondary current flows for once again reversing the magnetization of the ferromagnetic core; the secondary current is measured while the magnetization of the core is reversed in order to obtain a second measured value; the primary current is calculated in accordance with the first and the second measured value, the polarity of the voltage being regularly reversed at a certain sensor frequency that is continuously varied.