# US 12,000,869 B2 · Positioning and correction of current sensing devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,000,869 B2 - Document ID: US12000869B2 - Status: Granted - Kind: B2 - Application number: 17/869,120 - Filed: 2022-07-20 - Published: 2024-01-25 - Granted: 2024-06-04 - Earliest claimed: 2022-07-20 - Assignees: GM Global Technology Operations LLC - Applicants: GM Global Technology Operations LLC - Inventors: Muhammad Hussain Alvi; Suresh Gopalakrishnan - Web page: https://patentgrep.com/patent/US12000869B2 ## CPC - G01R 15/20: using galvano-magnetic devices, e.g. Hall-effect devices {, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices} - G01R 19/0092: {Measuring current only} - G01R 23/02: Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage - G01R 15/202: {using Hall-effect devices (Hall elements in arrangements for measuring electrical power G01R21/08)} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract A system includes a current sensor disposed proximate to a first conductor of a conductor assembly, the current sensor configured to measure a current through the first conductor and generate a first current measurement. The system also includes a correction module configured to perform a correction method. The correction method includes determining a frequency of the first current measurement, and applying a gain correction factor to the first current measurement, the gain correction factor based on pre-characterization data relating a gain of a reference current sensor to frequency. In addition, or alternatively, the correction method includes determining a first phase of the first current measurement, acquiring a second current measurement of a second conductor of the conductor assembly, determining a second phase of the second current measurement, and applying a current adjustment to the first current measurement based on a temporal relationship between the first phase and the second phase. ## Claims ### Claim 1 A system for sensing current, comprising: a current sensor disposed proximate to a first conductor of a conductor assembly, the current sensor configured to measure a current through the first conductor and generate a first current measurement; and a correction module configured to receive the first current measurement from the current sensor and perform a correction method, the correction method including at least one of: determining a frequency of the first current measurement, and applying a gain correction factor to the first current measurement, the gain correction factor based on pre-characterization data relating a gain of a reference current sensor to current frequency, wherein the pre-characterization data is acquired based on at least one of measuring and simulating a reference current through the reference current sensor at a plurality of frequencies, and deriving a reference gain distribution; and determining a first phase of the first current measurement, acquiring a second current measurement of a second conductor of the conductor assembly, determining a second phase of the second current measurement, and applying a current adjustment to the first current measurement based on a temporal relationship between the first phase and the second phase. ### Claim 2 (depends on 1) The system of claim 1, wherein the current sensor is a point field detection (PFD) sensor. ### Claim 3 (depends on 1) The system of claim 1, wherein the conductor assembly is connected to a power supply and an electric motor, and the reference gain distribution is indicative of gain as a function of speed of the electric motor. ### Claim 4 (depends on 1) The system of claim 1, wherein the gain correction factor is applied based on a data structure storing a plurality of gain values, each gain value associated with a respective gain correction factor value. ### Claim 5 (depends on 1) The system of claim 1, wherein the temporal relationship is based on a difference between the first phase and an expected phase of the measured current, the expected phase determined based on a preconfigured phase separation between current applied through the first conductor and current applied through the second conductor. ### Claim 6 (depends on 1) The system of claim 1, wherein the correction module is configured to apply the gain correction factor and the current adjustment using at least one of a lead and lag filter and a current regulator. ### Claim 7 (depends on 1) The system of claim 1, wherein the current sensor is a magnetic field sensor. ### Claim 8 (depends on 1) The system of claim 1, wherein the current sensor is disposed at a location selected based on a strength of a magnetic field around the first conductor and a degree of cross-coupling between the first conductor and the second conductor. ### Claim 9 A method of sensing current, comprising: measuring a current through a first conductor of a conductor assembly by a current sensor disposed proximate to the first conductor, to generate a first current measurement; and receiving the first current measurement at a correction module and performing a correction method, the correction method including at least one of: determining a frequency of the first current measurement, and applying a gain correction factor to the first current measurement, the gain correction factor based on pre-characterization data relating a gain of a reference current sensor to current frequency, wherein the pre-characterization data is acquired based on at least one of measuring and simulating a reference current through the reference current sensor at a plurality of frequencies, and deriving a reference gain distribution; and determining a first phase of the first current measurement, acquiring a second current measurement of a second conductor of the conductor assembly, determining a second phase of the second current measurement, and applying a current adjustment to the first current measurement based on a temporal relationship between the first phase and the second phase. ### Claim 10 (depends on 9) The method of claim 9, wherein the current sensor is a point field detection (PFD) sensor. ### Claim 11 (depends on 9) The method of claim 9, wherein the conductor assembly is connected to a power supply and an electric motor, and the reference gain distribution is indicative of gain as a function of speed of the electric motor. ### Claim 12 (depends on 9) The method of claim 9, wherein the gain correction factor is applied based on a data structure storing a plurality of gain values, each gain value associated with a respective gain correction factor value. ### Claim 13 (depends on 9) The method of claim 9, wherein the temporal relationship is based on a difference between the first phase and an expected phase of the measured current, the expected phase determined based on a preconfigured phase separation between the current applied through the first conductor and current applied through the second conductor. ### Claim 14 (depends on 9) The method of claim 9, wherein the gain correction factor and the current adjustment are applied using at least one of a lead and lag filter and a current regulator. ### Claim 15 (depends on 9) The method of claim 9, wherein the current sensor is a magnetic field sensor, and the current sensor is disposed at a location selected based on a strength of a magnetic field around the conductor and a degree of cross-coupling between the first conductor and the second conductor. ### Claim 16 A vehicle system comprising: a memory having computer readable instructions; and a processing device for executing the computer readable instructions, the computer readable instructions controlling the processing device to perform a method including: measuring a current through a first conductor of a conductor assembly by a current sensor disposed proximate to the first conductor, to generate a first current measurement; and receiving the first current measurement at a correction module and performing a correction method, the correction method including at least one of: determining a frequency of the first current measurement, and applying a gain correction factor to the first current measurement, the gain correction factor based on pre-characterization data relating a gain of a reference current sensor to current frequency, wherein the pre-characterization data is acquired based on at least one of measuring and simulating a reference current through the reference current sensor at a plurality of frequencies, and deriving a reference gain distribution; and determining a first phase of the first current measurement, acquiring a second current measurement of a second conductor of the conductor assembly, determining a second phase of the second current measurement, and applying a current adjustment to the first current measurement based on a temporal relationship between the first phase and the second phase. ### Claim 17 (depends on 16) The vehicle system of claim 16, wherein the current sensor is a point field detection (PFD) sensor. ### Claim 18 (depends on 16) The vehicle system of claim 16, wherein the conductor assembly is connected to a power supply and an electric motor, and the reference gain distribution is indicative of gain as a function of speed of the electric motor. ### Claim 19 (depends on 16) The vehicle system of claim 16, wherein the gain correction factor is applied based on a data structure storing a plurality of gain values, each gain value associated with a respective gain correction factor value. ### Claim 20 (depends on 16) The vehicle system of claim 16, wherein the temporal relationship is based on a difference between the first phase and an expected phase of the measured current, the expected phase determined based on a preconfigured phase separation between the current applied through the first conductor and current applied through the second conductor.