# US 11,994,387 B2 · Inductive sensor with improved safety > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,994,387 B2 - Document ID: US11994387B2 - Status: Granted - Kind: B2 - Application number: 17/301,746 - Filed: 2021-04-13 - Published: 2022-10-13 - Granted: 2024-05-28 - Earliest claimed: 2021-04-13 - Assignees: Infineon Technologies AG - Applicants: Infineon Technologies AG - Inventors: Friedrich Rasbornig; Dirk Hammerschmidt; Tobias Werth - Web page: https://patentgrep.com/patent/US11994387B2 ## CPC - G01B 7/30: for measuring angles or tapers; for testing the alignment of axes - G01D 5/2046: {by a movable ferromagnetic element, e.g. a core} - G01D 3/08: with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown - G01L 3/105: {involving inductive means (G01L3/102, G01L3/104 take precedence)} - G01L 5/221: {to steering wheels, e.g. for power assisted steering} - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR - G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) ## Abstract An inductive sensor may include a first angle measurement path associated with determining an angular position based on a first set of input signals. The inductive sensor may include a second angle measurement path associated with determining an angular position based on a second set of input signals. The inductive sensor may include an amplitude regulation path associated with regulating amplitudes of a set of output signals. The inductive sensor may include a safety path associated with performing one or more safety checks. Each safety check of the one or more safety checks may be associated with at least one of the first angle measurement path, the second angle measurement path, or the amplitude regulation path. ## Claims ### Claim 1 An inductive sensor, comprising: a first angle measurement path associated with determining an angular position based on a first set of input signals; a second angle measurement path associated with determining an angular position based on a second set of input signals; an amplitude regulation path associated with regulating amplitudes of a set of output signals; and a safety path associated with performing one or more safety checks, wherein each safety check of the one or more safety checks is associated with at least one of the first angle measurement path, the second angle measurement path, or the amplitude regulation path. ### Claim 2 (depends on 1) The inductive sensor of claim 1, wherein the first angle measurement path, the second angle measurement path, the amplitude regulation path, and the safety path are integrated on a monolithic semiconductor device. ### Claim 3 (depends on 1) The inductive sensor of claim 1, wherein the amplitude regulation path includes a partial safety path associated with performing a safety check, of the one or more safety checks, associated with the first set of input signals. ### Claim 4 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether a difference between the angular position determined on the first angle measurement path and the angular position determined on the second angle measurement path satisfies a threshold. ### Claim 5 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether an amplitude of an output signal, of the set of output signals, matches a target output signal amplitude determined on the amplitude regulation path. ### Claim 6 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether a target output signal amplitude determined on the amplitude regulation path matches a target output signal amplitude determined on the safety path. ### Claim 7 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether a vector length of amplitudes associated with the first set of input signals is within a particular vector length range on the amplitude regulation path. ### Claim 8 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether a vector length of amplitudes associated with the second set of input signals is within a particular vector length range on the safety path. ### Claim 9 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether an amplitude associated with a subset of the first set of input signals on the first angle measurement path matches an amplitude associated with a corresponding subset of the second set of input signals on the second angle measurement path. ### Claim 10 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether a torque based on an angle measurement path matches a torque based on the safety path. ### Claim 11 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether a resistance at a connection of the inductive sensor to an external coil satisfies a resistance threshold. ### Claim 12 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether a vector length of amplitudes associated with the first set of input signals is within a particular vector length range on the first angle measurement path. ### Claim 13 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether a vector length of amplitudes associated with the second set of input signals is within a particular vector length range on the second angle measurement path. ### Claim 14 (depends on 1) The inductive sensor of claim 1, wherein the one or more safety checks includes a determination of whether a characteristic of a first coil input associated with a first input signal matches a characteristic of a second coil input associated with a second input signal, wherein the first input signal is included in the first set of input signals and the second input signal is included in the second set of input signals. ### Claim 15 A method, comprising: receiving a plurality of signals on a safety path of an inductive sensor, wherein the plurality of signal comprises: a first signal received from a first angle measurement path of the inductive sensor or a second angle measurement path of the inductive sensor, and a second signal received from an amplitude regulation path of the inductive sensor; and performing one or more safety checks on the safety path based on the plurality of signals, wherein each safety check of the one or more safety checks is associated with at least one of the first angle measurement path, the second angle measurement path, or the amplitude regulation path. ### Claim 16 (depends on 15) The method of claim 15, wherein the first angle measurement path, the second angle measurement path, the amplitude regulation path, and the safety path are integrated on a monolithic semiconductor device. ### Claim 17 (depends on 15) The method of claim 15, wherein the plurality of signals includes a first signal indicating an angular position determined on the first angle measurement path and a second signal indicating an angular position determined on the second angle measurement path, and wherein performing the one or more safety checks comprises: determining whether a difference between the angular position determined on the first angle measurement path and the angular position determined on the second angle measurement path satisfies a threshold. ### Claim 18 (depends on 15) The method of claim 15, wherein the plurality of signals includes a third signal indicating an amplitude of an output signal, and fourth signal indicating a target output signal amplitude determined on the amplitude regulation path, and wherein performing the one or more safety checks comprises: determining whether the amplitude of the output signal matches the target output signal amplitude. ### Claim 19 An inductive sensor, comprising: a first measurement path associated with determining a position of a first object based on a first set of input signals; a second measurement path associated with determining a position of a second object based on a second set of input signals; an amplitude regulation path associated with regulating amplitudes of a set of output signals; and a safety path associated with assessing functionality of at least one of the first measurement path, the second measurement path, or the amplitude regulation path. ### Claim 20 (depends on 19) The inductive sensor of claim 19, wherein the first measurement path, the second measurement path, the amplitude regulation path, and the safety path are integrated on a monolithic semiconductor device.