# US 11,112,434 B2 · Sensor apparatus for measuring direct and alternating currents > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,112,434 B2 - Document ID: US11112434B2 - Status: Granted - Kind: B2 - Application number: 16/779,841 - Filed: 2020-02-03 - Published: 2020-08-06 - Granted: 2021-09-07 - Earliest claimed: 2019-02-01 - Assignees: Dr. Ing. h.c. F. Porsche Aktiengesellschaft - Applicants: Dr. Ing. h.c. F. Porsche Aktiengesellschaft - Inventors: Stefan Goetz - Web page: https://patentgrep.com/patent/US11112434B2 ## CPC - G01R 15/181: {using coils without a magnetic core, e.g. Rogowski coils} - G01R 15/207: {Constructional details independent of the type of device used} - G01R 33/072: {Constructional adaptation of the sensor to specific applications} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract A sensor apparatus (1) is provided for measuring direct and alternating currents through a conductor (2). The sensor apparatus (1) has a Rogowski coil (3) and the plane of main extent of the Rogowski coil (3) is arranged substantially orthogonally in relation to the direction of main extent of the conductor (2). The conductor (2) is enclosed by the Rogowski coil (3). The sensor apparatus (1) also has a plurality of magnetic field sensors. ## Claims ### Claim 1 A sensor apparatus for measuring direct and alternating currents through a conductor, the sensor apparatus comprising: a Rogowski coil, a plane of a main extent of the Rogowski coil being arranged substantially orthogonally to the direction of main extent of the conductor, the conductor being enclosed by the Rogowski coil; and a plurality of magnetic field sensors, wherein: the sensor apparatus has an evaluation electronics system for evaluating the measurement values of the magnetic field sensors, the evaluation electronics system being an analog evaluation electronics system the evaluation electronics system has a preamplifier for each magnetic field sensor, and the evaluation electronics system further has an amplifier, the preamplifiers being configured to preamplify by a respective preamplification factor, the preamplification factors being proportional to distances of the respective magnetic field sensor from its nearest adjacent magnetic field sensors. ### Claim 2 (depends on 1) The sensor apparatus of claim 1, wherein the magnetic field sensors are Hall sensors. ### Claim 3 (depends on 1) The sensor apparatus of claim 1, wherein the magnetic field sensors are arranged in the plane of main extent of the Rogowski coil, and the Rogowski coil is arranged between the conductor and the magnetic field sensors. ### Claim 4 (depends on 1) The sensor apparatus of claim 1, wherein the magnetic field sensors are arranged on an annular area around the conductor, the conductor being arranged in the center of the annular area, distances between adjacent magnetic field sensors along the annular area being equal. ### Claim 5 (depends on 1) The sensor apparatus of claim 1, wherein the magnetic field sensors are arranged such that a measurement direction of the magnetic field sensors lies tangentially in relation to the Rogowski coil and along the plane of main extent of the Rogowski coil. ### Claim 6 (depends on 1) The sensor apparatus of claim 1, wherein the evaluation electronics system has a low-pass filter. ### Claim 7 A sensor apparatus for measuring direct and alternating currents through a conductor, the sensor apparatus comprising: a Rogowski coil, a plane of a main extent of the Rogowski coil being arranged substantially orthogonally to the direction of main extent of the conductor, the conductor being enclosed by the Rogowski coil; and a plurality of magnetic field sensors, wherein: the sensor apparatus has an evaluation electronics system for evaluating the measurement values of the magnetic field sensors, the evaluation electronics system being an analog evaluation electronics system, the evaluation electronics system has a preamplifier for joint amplification of all magnetic field sensors, and the evaluation electronics system has an amplifier. ### Claim 8 A sensor apparatus for measuring direct and alternating currents through a conductor, the sensor apparatus comprising: a Rogowski coil, a plane of a main extent of the Rogowski coil being arranged substantially orthogonally to the direction of main extent of the conductor, the conductor being enclosed by the Rogowski coil; and a plurality of magnetic field sensors, wherein: the sensor apparatus has an evaluation electronics system for evaluating the measurement values of the magnetic field sensors, the evaluation electronics system being an analog evaluation electronics system, the evaluation electronics system is configured to generate a correction value, and the evaluation electronics system being configured: to generate a mean value of the measurement values of the magnetic field sensors, to generate difference values of the respective magnetic field sensors, where the difference value is a difference between the measurement value of the respective magnetic field sensor and the mean value, and to generate the correction value from the difference values. ### Claim 9 (depends on 1) A method for measuring direct and alternating currents flowing through a conductor using the sensor apparatus of claim 1, the method comprising measuring alternating currents using the Rogowski coil and measuring direct currents using the magnetic field sensors. ### Claim 10 (depends on 7) A method for measuring direct and alternating currents flowing through a conductor using the sensor apparatus of claim 7, the method comprising measuring alternating currents using the Rogowski coil and measuring direct currents using the magnetic field sensors. ### Claim 11 (depends on 8) A method for measuring direct and alternating currents flowing through a conductor using the sensor apparatus of claim 8, the method comprising measuring alternating currents using the Rogowski coil and measuring direct currents using the magnetic field sensors.