# US 2023/0056952 A1 · Induction heating device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0056952 A1 - Document ID: US20230056952A1 - Status: Published application - Kind: A1 - Application number: 17/797,005 - Filed: 2020-06-26 - Published: 2023-02-23 - Earliest claimed: 2020-02-27 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jea Shik HEO; Ho Yong JANG - Web page: https://patentgrep.com/patent/US20230056952A1 ## CPC - H05B 6/062: {for cooking plates or the like} - H05B 6/1272: {with more than one coil or coil segment per heating zone} - H05B 6/065: {using coordinated control of multiple induction coils} - H05B 6/44: having more than one coil or coil segment - H05B 2213/05: Heating plates with pan detection means - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract Disclosed is an induction heating device. The disclosed induction heating device senses whether a container placed on a heating coil is off-center, and if so, the direction in which the container is off-center, on the basis of a change in the resonance current of a plurality of sensing coils disposed along the circumferential direction above the heating coil. Each of the plurality of sensing coils includes a plurality of first layer sensing coils and a plurality of second layer sensing coils. Each of the plurality of first layer sensing coils is electrically connected to a corresponding second layer sensing coil among the plurality of second layer sensing coils. The first layer sensing coil and the second layer sensing coil that are connected to each other are vertically misaligned and have opposite winding directions. ## Claims ### Claim at position 1 1-15. (canceled) ### Claim 16 An induction heating device, comprising: a heating coil; a sensing part comprising a plurality of first layer sensing coils and a plurality of second layer sensing coils forming pairs of a first layer sensing coil and a second layer sensing coil that are spaced from the heating coil perpendicularly; and a controller configured to detect an eccentric placement of a container on the heating coil, based on a change in resonance current flowing in a pair of the first layer sensing coil and the second layer sensing coil in the sensing part, wherein each of the plurality of first layer sensing coils electrically connects to a corresponding second layer sensing coil among the plurality of second layer sensing coils, and the first layer sensing coil and the second layer sensing coil that connect to each other are misaligned perpendicularly with respect to each other, and are wound in opposite directions with respect to each other. ### Claim 17 (depends on 16) The induction heating device of claim 16, wherein any two horizontally adjacent sensing coils, among the plurality of first layer sensing coils and the plurality of second layer sensing coils, are spaced from each other at a regular interval. ### Claim 18 (depends on 16) The induction heating device of claim 16, wherein each of the plurality of first layer sensing coils are arranged adjacent to each other and each of the plurality of second layer sensing coils are arranged adjacent to each other. ### Claim 19 (depends on 16) The induction heating device of claim 16, wherein the plurality of first layer sensing coils are spaced from a central perpendicular line passing through a center of the heating coil and are arranged side by side circumferentially around the central perpendicular line, the plurality of second layer sensing coils are spaced from the central perpendicular line and are arranged side by side circumferentially around the central perpendicular line, and each of the plurality of first layer sensing coils and the plurality of second layer sensing coils has a sector shape. ### Claim 20 (depends on 16) The induction heating device of claim 16, wherein the plurality of first layer sensing coils and the plurality of second layer sensing coils have the same shape. ### Claim 21 (depends on 16) The induction heating device of claim 16, wherein the first layer sensing coil and the second layer sensing coil that connect to each other are disposed to partially overlap with each other perpendicularly. ### Claim 22 (depends on 16) The induction heating device of claim 16, wherein the second layer sensing coil partially overlaps with each of two adjacent first layer sensing coils perpendicularly. ### Claim 23 (depends on 16) The induction heating device of claim 16, wherein a coupling coefficient of one pair of the first layer sensing coil and the second layer sensing coil that are connected to each other is the same as a coupling coefficient of an adjacent pair of the first layer sensing coil and the second layer sensing coil that are connected to each other. ### Claim 24 (depends on 16) The induction heating device of claim 16, wherein the second layer sensing coil is disposed on two adjacent first layer sensing coils in a way that the second layer sensing coil overlaps an area of a same size in each of the two adjacent first layer sensing coils. ### Claim 25 (depends on 16) The induction heating device of claim 16, wherein the controller is configured to detect the eccentricity placement of the container on the heating coil, based on at least one of changes in amplitude and a frequency of the resonance current flowing in the pair of the first layer sensing coil and the second layer sensing coil in the sensing part. ### Claim 26 (depends on 16) The induction heating device of claim 16, comprising an oscillator that connects to the pair of the first layer sensing coil and the second layer sensing coil that are connected to each other, wherein the controller is configured to detect the change in the resonance current flowing in the pair of the first layer sensing coil and the second layer sensing coil, based on an output of the oscillator. ### Claim 27 (depends on 16) The induction heating device of claim 16, wherein the controller is configured to detect a direction of the eccentric placement of the container on the heating coil, based on a position of the pair of the first layer sensing coil and the second layer sensing coil in the sensing part in which the resonance current changes. ### Claim 28 (depends on 16) The induction heating device of claim 16, wherein the controller is configured to determine that the container is placed eccentrically on the heating coil when an amplitude of the resonance current flowing in the pair of the first layer sensing coil and the second layer sensing coil is less than a reference magnitude. ### Claim 29 (depends on 16) The induction heating device of claim 16, wherein the controller is configured to determine that the container is placed eccentrically on the heating coil when a frequency of the resonance current flowing in the pair of the first layer sensing coil and the second layer sensing coil is less than a reference frequency. ### Claim 30 (depends on 16) The induction heating device of claim 16, wherein the controller configured to identify the pair of the first layer sensing coil and the second layer sensing coil in which the resonance current changes, and determine that the container is placed eccentrically on the heating coil in a direction symmetrical to a direction of the identified pair of the first layer sensing coil and the second layer sensing coil with respect to a central perpendicular line passing through a center of the heating coil.