Magnetoresistor integrated sensor for measuring voltage or current, and diagnostic system

摘要

The invention relates to an integrated sensor, including terminals (1, 2) for connection to an electric generator, said terminals being connected to a metal measuring line (4, 5) in which a current proportional to the voltage or current of the generator to be measured flows, and magnetoresistors (31, 32, 33, 34). The metal measuring line includes elongate and parallel sections (4, 5) in which the current flows in opposite directions, said sections being connected to a portion (3) for closing the metal measuring line (3, 4, 5), which is arranged on a galvanic isolation layer (8) that is in turn arranged on an integrated circuit portion including the magnetoresistors (31, 32, 33, 34), each of which have a sensitive portion that is vertically adjacent to one of the elongate sections (4, 5). The sensor can be integrated into a diagnostic system.

主权项

1. A magnetoresistor integrated sensor for measuring voltage or current, comprising first and second terminals for connection to a generator for which the voltage or current is to be measured, linked to a metal measuring line through which flows a current proportional to the voltage or current of the generator which is to be measured, and at least two magnetoresistors for measuring the magnetic field created remotely by said current flowing through such measuring line,
wherein the metal measuring line includes at least first and second elongated and parallel sections through which the current flows in opposite directions, connected to a section aimed at closing the measuring line, with the metal measuring line unit being arranged on one of the faces of an integrated galvanic isolation layer for voltages higher than or equal to 1500 V, with said integrated galvanic isolation layer being itself arranged on a section of the integrated detection circuit, said portion of the integrated detection circuit includes at least two magnetoresistors which themselves each have a sensitive section that is essentially superimposed onto one of the elongated sections of the metal measuring line in order to be sensitive to the field created by the current flowing through the measuring line and in that each of the first and second elongated sections of the metal measuring line comprises a narrowing or constriction in a zone near a zone superimposed onto a liaison path to a ground contact, on the side of said first and second terminals, said constrictions being used as an integrated fuse in case of an isolation defect created by an overvoltage peak.