# US 2021/0243853 A1 · Induction heating cooking apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243853 A1 - Document ID: US20210243853A1 - Status: Published application - Kind: A1 - Application number: 17/050,926 - Filed: 2018-06-14 - Published: 2021-08-05 - Earliest claimed: 2018-06-14 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Ikuro SUGA; Hayato YOSHINO - Web page: https://patentgrep.com/patent/US20210243853A1 ## CPC - H05B 6/1245: {with special coil arrangements} - H05B 6/1272: {with more than one coil or coil segment per heating zone} - H05B 6/062: {for cooking plates or the like} - H05B 2206/022: Special supports for the induction coils - Y02B 40/00: Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract An induction heating cooking apparatus according to an embodiment of the present disclosure includes: a plurality of heating coils each including an inner circumferential coil provided on an innermost circumferential side and an outer circumferential coil provided on an outermost circumferential side; and a supporting base that is provided below the plurality of heating coils, and support the plurality of heating coils. The supporting base is formed in the shape of a flat plate and made of a nonmagnetic body, and has a plurality of openings under the outer circumferential coil. ## Claims ### Claim 1 An induction heating cooking apparatus comprising: a plurality of heating coils including an inner circumferential coil provided on an innermost circumferential side, an outer circumferential coil provided on an outermost circumferential side, and an intermediate coil provided between the inner circumferential coil and the outer circumferential coil; a supporting base provided below the plurality of heating coils, and configured to support the plurality of heating coils; a plurality of inverter circuits each configured to supply high-frequency power to an associated one of the plurality of heating coils; and a controller configured to control driving of the plurality of inverter circuits, and perform a heating operation in which a frequency of high-frequency power to be supplied to the outer circumferential coil is increased higher than a frequency of high-frequency power to be supplied to the inner circumferential coil, and a frequency of high-frequency current to be supplied to the intermediate coil is increased higher than the frequency of the high-frequency current to be supplied to the inner circumferential coil, wherein the supporting base is formed in the shape of a flat plate and made of a nonmagnetic body, and includes a plurality of openings formed in part of the supporting base that is located below the outer circumferential coil, and also a plurality of openings formed in part of the supporting base that is located below the intermediate coil. ### Claim 2 (canceled) ### Claim 3 (depends on 1) The induction heating cooking apparatus of claim 1, wherein the openings of the supporting base are notches provided in an outer circumferential edge of the supporting base. ### Claim 4 (depends on 1) The induction heating cooking apparatus of claim 1, further comprising: a plurality of ferrites provided between the plurality of heating coils and the supporting base; wherein of the plurality of ferrites, the ferrite provided under the outer circumferential col is located in a larger area than an area in which the ferrite provided under the inner circumferential coil is located, as viewed in plan view. ### Claim 5 (depends on 1) The induction heating cooking apparatus of claim 1, further comprising: a plurality of ferrites provided between the plurality of heating coils and the supporting base; wherein of the plurality of ferrites, the ferrite provided under the outer circumferential coil have a lower magnetic resistance than a magnetic resistance of the ferrite provided under the inner circumferential coil, at the frequency of the high-frequency current to be supplied to the outer circumferential coil. ### Claim 6 (depends on 4) The induction heating cooking apparatus of claim 4, wherein the ferrite provided under the outer circumferential coil is formed such that an end portion of the ferrite that is located on an outer circumferential side of the outer circumferential coil projects upwards along a side surface of the outer circumferential coil. ### Claim 7 (depends on 4) The induction heating cooking apparatus of claim 4, wherein the ferrite provided under the outer circumferential coil is formed such that an end portion of the ferrite that is located on an inner circumferential side of the outer circumferential coil projects upwards along a side surface of the outer circumferential coil. ### Claim 8 (depends on 4) The induction heating cooking apparatus of claim 4, further comprising an insulator provided between the plurality of heating coils and the plurality of ferrites. ### Claim 9 (depends on 4) The induction heating cooking apparatus of claim 4, further comprising an insulator provided between the plurality of ferrites and the supporting base. ### Claim 10 (depends on 1) The induction heating cooking apparatus of claim 1, further comprising magnetic shield members that are provided below the openings of the supporting base and made of a flat metal plate. ### Claim 11 (depends on 10) The induction heating cooking apparatus of claim 10, wherein an end portion of each of the magnetic shield members is connected to part of an edge of an associated one of the openings. ### Claim 12 (depends on 11) The induction heating cooking apparatus of claim 11, wherein the magnetic shield members are formed integrally with the supporting base, by forming the openings by cutting and raising part of the supporting base. ### Claim 13 (depends on 1) The induction heating cooking apparatus of claim 1, wherein the plurality of heating coils have different diameters and are concentrically arranged. ### Claim 14 (depends on 1) The induction heating cooking apparatus of claim 1, further comprising a material determining unit configured to determine a material of part of an object to be heated that is located above each of the plurality of heating coils, wherein when a material of part of the object that is located above the outer circumferential coil includes at least a nonmagnetic body, and a material of part of the object that is located above the inner circumferential coil is a magnetic body, the controller increases a frequency of high-frequency current to be supplied to the outer circumferential coil to a frequency higher than a frequency of high-frequency current to be supplied to the inner circumferential coil.