Heating apparatus and cooking utensil

Abstract

The present application discloses a heating apparatus and a cooking utensil, the heating apparatus comprising a mounting bracket, a coil winding, and a magnetically conductive structure, the mounting bracket being provided with corner parts, the coil winding being mounted on the mounting bracket, and the magnetically conductive structure being arranged on one side of the coil winding. The magnetically conductive structure comprises first magnetic strips, and the first magnetic strips extend outward from the middle of the coil winding to the corner parts.

Description

Heating devices and cooking utensils

[0001] This application claims priority to Chinese patent application No. 202420604198.3 filed on March 26, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the technical field of electromagnetic heating, and in particular to a heating device and a cooking appliance. Background Art

[0003] Electromagnetic heating is now ubiquitous in household appliances. Electromagnetic heating uses a coil as a magnetic field, which acts on the pot to generate a heating current. This current acts on the cooking pot, generating heat. The location and area of ​​the heat field within the pot are determined by the coil's winding position, meaning the heat field stays within the coil's area.

[0004] For conventional induction cookers (stoves), the cooking support surface is almost flat, and the bottom of the supported pot is also flat. In order to increase the heating area, the heating coils of our conventional products also use square coils to match the square inner pot to achieve a larger heating area (see Figures 1 and 2). However, the corner positions of such conventional square coils have weaker heating because the magnetic fields of the coils on both sides of the corners cancel each other out. When cooking with square pots, the heat field at the four corners of the pot will also be weak. Therefore, this conventional square coil solution will cause the heat field in the corners to be weak, and cannot truly achieve the square heating effect of the coil shape. Technical issues

[0005] The main purpose of this application is to propose a heating device and a cooking utensil, which aims to solve the problem that there are heating blind spots in the corners of existing square plates, resulting in weak thermal fields in the corners. Technical Solutions

[0006] To achieve the above objectives, the present application proposes a heating device, which includes:

[0007] a mounting bracket, the mounting bracket having corner portions;

[0008] a coil winding mounted on the mounting bracket; and

[0009] The magnetic conductive structure is provided on one side of the coil winding, and the magnetic conductive structure includes a first magnetic strip, which extends outward from the middle of the coil winding and extends to the corner.

[0010] In one embodiment, the mounting bracket is arranged in a quasi-square shape to have a plurality of first side edges, and the corner portion is formed at the intersection of two adjacent first side edges.

[0011] In one embodiment, the first magnetic strip is arranged in a straight line.

[0012] In one embodiment, the first magnetic strip includes a first main section extending from the middle of the coil winding to the corner portion, and a first protruding section bent from at least one end portion of the first main section toward the other side of the coil winding, and the first protruding section is located outside the outermost coil of the coil winding.

[0013] In one embodiment, the mounting bracket has a plurality of corner portions, and correspondingly, a plurality of first magnetic strips are provided.

[0014] In one embodiment, the coil winding includes a first coil winding and a second coil winding arranged around the periphery of the first coil winding. The second coil winding is arranged in a square ring shape to have multiple second sides. A chamfer is provided at the intersection of two adjacent second sides, and the chamfer is provided corresponding to the corner portion.

[0015] In one embodiment, the magnetic conductive structure further includes a plurality of magnetic strips spaced apart along the circumference of the mounting bracket, and each of the magnetic strips extends from the middle of the coil winding to the circumference thereof.

[0016] In one embodiment, the plurality of magnetic strips include a plurality of second magnetic strips and a plurality of third magnetic strips, the length of the second magnetic strips is set to be greater than the third magnetic strips, each of the second magnetic strips is located between each adjacent two of the first magnetic strips, and each of the third magnetic strips is located between the adjacent first magnetic strips and the second magnetic strips.

[0017] In one embodiment, each of the second magnetic strips extends from the inner side of the innermost turn of the first coil winding to the outer side of the outermost turn of the second coil winding; and / or,

[0018] Each of the third magnetic strips extends from the inner side of the innermost circle of the second coil winding to the outer side of the outermost circle of the second coil winding.

[0019] In one embodiment, the second magnetic strip includes a second main section extending from the middle of the coil winding to the corner portion, and a second protruding section bent from at least one end of the second main section from one side of the coil winding to the other side thereof, and the second protruding section is located on the inner side of the innermost coil of the coil winding.

[0020] In one embodiment, the magnetic permeability of each of the second magnetic strips is set to be smaller than that of each of the first magnetic strips and each of the third magnetic strips.

[0021] In one embodiment, the coil winding is arranged in a quasi-square shape, and the side length of the coil winding is set to A, wherein 170 mm ≤ A ≤ 260 mm.

[0022] In one embodiment, the square-like shape includes one of a rectangle, a square and a racetrack shape.

[0023] The present application also provides a cooking appliance, the cooking appliance comprising a heating device, the heating device comprising:

[0024] a mounting bracket, the mounting bracket having corner portions;

[0025] a coil winding mounted on the mounting bracket; and

[0026] The magnetic conductive structure is provided on one side of the coil winding, and the magnetic conductive structure includes a first magnetic strip, which extends outward from the middle of the coil winding and extends to the corner.

[0027] In one embodiment, the cooking appliance comprises an induction cooker or an induction range. Beneficial effects

[0028] In the technical solution provided in the present application, the coil winding is installed on the mounting bracket. Since the mounting bracket has corners, the magnetic field generated by the coil winding is difficult to reach the corners, that is, it is difficult to form a heat field at the corners of the cookware, which causes uneven heating of the cookware. By extending the first magnetic strip from the middle of the coil winding toward the outside and extending it to the corners, the magnetic field is guided to the corners by utilizing the magnetic concentration effect of the magnetic strip, so that the magnetic field at the corners is increased, thereby achieving the strengthening of the heat field of the cookware at the corresponding position of the corners, so as to solve the problem that there is a heating blind spot in the corners of the existing square plate, resulting in a weak heat field in the corners. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] FIG1 is a plan view of a coil winding involved in this application;

[0031] FIG2 is a schematic diagram of the thermal field range formed by the square coil disk;

[0032] FIG3 is a plan view of an embodiment of a heating device provided by the present application;

[0033] FIG4 is a schematic diagram of the thermal field range corresponding to the square coil winding of the heating device provided by the present application;

[0034] FIG5 is an exploded schematic diagram of an embodiment of the cooking appliance provided in the present application.

[0035] Description of Figure Numbers:

[0036] Reference number name Reference number name 1 mounting bracket 22 second coil winding 11 corner portion 221 second side 12 first side 3 first magnetic strip 2 coil winding 4 second magnetic strip 21 first coil winding 5 third magnetic strip

[0037] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0038] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0041] Electromagnetic heating is almost universally adopted in household appliances. Electromagnetic heating uses a coil as a magnetic field, which acts on the pot to generate a heating current. This current acts on the cooking pot, generating heat. The location and area of ​​the heat field within the pot are determined by the coil's winding position; that is, the heat field does not extend beyond the coil area. Conventional induction cooktops have a nearly flat cooking surface, and the bottom of the pot they support is also flat. To increase the heating area, our conventional heating coils sometimes use square coils to match square pots, achieving a larger heating area (see Figures 1 and 2). However, these conventional square coils have weaker heating at the corners because the magnetic fields of the coils on either side cancel each other out. When cooking with a square pot, the heat field is also weak at the four corners. Therefore, this conventional square coil solution results in a weaker heat field in the corners, failing to achieve the desired heating effect.

[0042] In order to solve the above problems, the present application provides a heating device, Figure 1 is a planar schematic diagram of the coil winding involved in the present application; Figure 2 is a schematic diagram of the thermal field range formed by the square coil disk; Figure 3 is a planar schematic diagram of an embodiment of the heating device provided by the present application; Figure 4 is a schematic diagram of the thermal field range formed by the square coil winding of the heating device provided by the present application; Figure 5 is an exploded schematic diagram of an embodiment of the cooking utensil provided by the present application.

[0043] Please refer to Figures 3 to 4. The heating device includes a mounting bracket 1, a coil winding 2 and a magnetic conductive structure. The mounting bracket 1 has a corner portion 11; the coil winding 2 is installed on the mounting bracket 1; the magnetic conductive structure is arranged on one side of the coil winding 2, and the magnetic conductive structure includes a first magnetic strip 3, which extends outward from the middle of the coil winding 2 and extends to the corner portion 11.

[0044] It should be noted that the corner portion 11 can be understood as a non-arc shape, so the coil disk is non-circular, that is, the coil disk is set to have a shape of a corner portion 11, such as a polygon, a sector, etc.

[0045] It is understandable that the magnetic strips, as magnetic conductors, can concentrate and guide the magnetic field, making it more concentrated and powerful. By providing the magnetic strips, the present application can, on the one hand, reduce the dissipation of the magnetic field, thereby enhancing the magnetic field strength of the coil; on the other hand, the magnetic strips can help orient and focus the magnetic field, making it more concentrated and more directional. The magnetic field can be guided according to the layout direction and shape of the magnetic strips.

[0046] In the technical solution provided in the present application, the coil winding 2 is installed on the mounting bracket 1. Since the mounting bracket 1 has a corner portion 11, the magnetic field generated by the coil winding 2 is difficult to reach the corner portion 11, that is, it is difficult to form a heat field at the position of the cookware corresponding to the corner portion 11, thereby causing uneven heating of the cookware. By extending the first magnetic strip 3 from the middle of the coil winding 2 toward the outside and extending it to the corner portion 11, the magnetic field is guided to the corner portion 11 by utilizing the magnetic concentration effect of the magnetic strip, so that the magnetic field at the corner portion 11 is increased, thereby achieving the strengthening of the heat field of the cookware at the position corresponding to the corner portion 11, so as to solve the problem that there is a heating blind spot in the corner of the existing square plate, resulting in a weak heat field in the corner.

[0047] Specifically, in this embodiment, the mounting bracket 1 is quasi-square in shape, having multiple first sides 12. The intersection of two adjacent first sides 12 forms the corner portions 11. Thus, when the coil winding 2 is circular, the four corners of the mounting bracket 1 form the corner portions 11 relative to the coil winding 2. Because the housings of most cooking appliances on the market are square, the mounting bracket 1 is designed to better fit within the housing of the cooking appliance.

[0048] Of course, the mounting bracket 1 may also be provided in other possible shapes, such as a pentagon, a hexagon, a diamond, etc. The specific shape may be determined according to actual conditions, and the embodiments of this specification do not limit this.

[0049] The effects of the first magnetic strip 3 vary depending on its shape. In the first embodiment, the first magnetic strip 3 is arranged in a straight line. Due to the shape characteristics of the bar magnet, the magnetic field can be made more uniform and directional, thereby better controlling the directionality of the magnetic field.

[0050] In the second embodiment, the first magnetic strip 3 includes a first main section extending from the middle of the coil winding 2 to the corner portion 11, and a first protruding section bent from the inner end of the first main section toward the other side of the coil winding 2. The first protruding section is located outside the outermost coil of the coil winding 2. Thus, the first magnetic strip 3 forms an L-shape. When the first protruding section is located outside the outermost coil of the coil winding 2, it can prevent the magnetic field from spreading outward, thereby providing magnetic shielding on the circumference of the coil winding 2.

[0051] In the third embodiment, the first magnetic strip 3 includes a first main section extending from the middle of the coil winding 2 to the corner portion 11, and two first protruding sections bent from the inner and outer ends of the first main section toward the other side of the coil winding 2, respectively. One of the first protruding sections is located on the inner side of the innermost coil of the coil winding 2, and the other first protruding section is located on the outer side of the outermost coil of the coil winding 2. Of course, the first protruding section located at the inner end of the first main section may also be a coil that passes through part of the inner region or passes through the entire inner region. In this way, the first magnetic strip 3 forms a U-shape. When the first protruding section located on the outer side is located on the outer side of the outermost coil of the coil winding 2, it can prevent the magnetic field from spreading outward, thereby magnetically shielding the circumference of the coil winding 2. The first protruding section located on the inner side further enhances the magnetic field around the corner portion 11.

[0052] Furthermore, in this embodiment, the mounting bracket 1 has multiple corner portions 11, and correspondingly, multiple first magnetic strips 3 are provided. Thus, each first magnetic strip 3 can guide the magnetic field toward the corresponding corner portion 11, thereby making the magnetic field generated by the coil winding 2 as compatible as possible with the shape of the mounting bracket 1, thereby ensuring that the coil winding 2 has the largest possible heating area, and can provide a larger heating field area for larger cookware.

[0053] In this embodiment, the coil winding 2 includes a first coil winding 21 and a second coil winding 22 arranged around the periphery of the first coil winding 21. The second coil winding 22 is configured as a square ring having multiple second sides 221. A chamfer is provided at the intersection of two adjacent second sides 221, and the chamfer is provided corresponding to the corner portion 11.

[0054] It should be noted that, referring to Figure 2, the second coil winding 22 is set to a square ring shape, so the winding is about 90 degrees at the corner. During operation, the current direction of the two adjacent sides of the square second coil winding 22 suddenly changes at the corner, the induced magnetic field generated by the coil changes 90°, the direction of the magnetic field suddenly changes, and the partial components of the magnetic field generated by the same wire on both sides of the corner are offset, resulting in a weak magnetic field at the corner and a weak thermal field, resulting in a thermal field only formed in area A, blind spots appearing at the four corners, and uneven heating.

[0055] The chamfers are used to create a transition between the two second side edges 221, preventing sudden changes in the current direction between the two second side edges 221. This reduces the degree of magnetic field component cancellation, mitigates sudden changes in the electromagnetic field, and makes the thermal field more uniform. Furthermore, the chamfers are positioned corresponding to the corner portions 11, and the first magnetic strips 3 can further guide the magnetic field at the chamfers to accommodate the shape of the mounting bracket 1, thereby also forming a thermal field in area B. The thermal field generated by the heating device comprises eight thermal field zones, four areas A and four areas B, thereby increasing the heating area and heating energy efficiency.

[0056] In this embodiment, the magnetic conductive structure further comprises a plurality of magnetic strips spaced circumferentially around the mounting bracket 1, each extending from the center of the coil winding 2 to its circumference. The provision of multiple circumferentially spaced magnetic strips allows for a more uniform magnetic field distribution throughout the coil, improving coil performance and stability. This also increases coil efficiency, enabling the coil windings to generate a stronger magnetic field at a given current, or requiring less current to maintain the same magnetic field.

[0057] It is understood that the shapes and sizes of the magnetic strips can be identical or inconsistent to achieve better results. Specifically, in this embodiment, the multiple magnetic strips include multiple second magnetic strips 4 and multiple third magnetic strips 5. The second magnetic strips 4 are longer than the third magnetic strips 5. Each second magnetic strip 4 is positioned between two adjacent first magnetic strips 3, and each third magnetic strip 5 is positioned between adjacent first and second magnetic strips 3 and 4. Thus, by providing multiple second magnetic strips 4, a radial magnetic structure is formed with the first magnetic strips 3, resulting in a more uniform magnetic field distribution throughout the coil. Longer second magnetic strips 4 provide a larger magnetic shielding area and greater magnetic permeability, absorbing and transferring magnetic fields. The shorter third magnetic strip 5, positioned between two relatively longer first and second magnetic strips 3 and 4, fills the gap between them and reduces the range of magnetic field interference. The first, second, and third magnetic strips 3 and 4 form a protective ring, effectively reducing magnetic field diffusion and magnetic leakage, thereby enhancing magnetic shielding effectiveness.

[0058] Specifically, in this embodiment, each second magnetic strip 4 extends from the innermost circle of the first coil winding 21 to the outermost circle of the second coil winding 22; and / or each third magnetic strip 5 extends from the innermost circle of the second coil winding 22 to the outermost circle of the second coil winding 22. In this way, the second magnetic strip 4 can increase the magnetic field strength in the area corresponding to the entire coil winding 2. Because the magnetic field strength of the inner circle of the coil winding 2 is relatively greater than that of the outer circle, the provision of the third magnetic strip 5 further enhances the magnetic field in the outer circle of the coil winding 2. Providing magnetic strips in areas with weaker magnetic fields makes the magnetic field distribution more uniform throughout the coil.

[0059] Specifically, in this embodiment, the second magnetic strip 4 includes a second main body section extending from the middle of the coil winding 2 to the corner portion 11, and a second protruding section bent from at least one end of the second main body section from one side of the coil winding 2 toward the other side thereof, and the second protruding section is located on the inner side of the innermost coil of the coil winding 2.

[0060] In the first embodiment, the second magnetic strip 4 includes a second main section extending from the middle of the coil winding 2 to the corner portion 11, and a second protruding section extending from the inner end of the second main section and bending from one side of the coil winding 2 to the other side. The second protruding section is located inward of the innermost coil of the coil winding 2. Thus, the second magnetic strip 4 is configured in an L-shape. Because the magnetic field in the center of the first coil winding 21 is relatively weak, locating the second protruding section inward of the innermost coil of the coil winding 2 further enhances the magnetic field in the center of the first coil winding 21.

[0061] In the second embodiment, the second magnetic strip 4 includes a second main section extending from the middle of the coil winding 2 to the corner portion 11, and a second protruding section extending from the outer end of the second main section and bending from one side of the coil winding 2 to the other side thereof. The second protruding section is located outside the outermost coil of the coil winding 2. Thus, the second magnetic strip 4 is configured in an L-shape. When the second protruding section is located outside the outermost coil of the coil winding 2, outward spread of the magnetic field can be prevented, thereby providing magnetic shielding around the coil winding 2.

[0062] In the second embodiment, the second magnetic strip 4 includes a second main section extending from the middle of the coil winding 2 to the corner portion 11, and two second protruding sections bent from the inner and outer ends of the second main section, respectively, from one side of the coil winding 2 to the other side thereof. One of the second protruding sections is located outside the outermost coil of the coil winding 2, and the other second protruding section is located inside the innermost coil of the coil winding 2. Thus, the second magnetic strip 4 forms a U-shape. When the outer second protruding section is located outside the outermost coil of the coil winding 2, it prevents the magnetic field from spreading outward, thereby magnetically shielding the circumference of the coil winding 2. The inner second protruding section further enhances the magnetic field in the central region of the first coil winding 21.

[0063] Furthermore, in this embodiment, the magnetic permeability of each second magnetic strip 4 is set to be lower than that of each first magnetic strip 3 and each third magnetic strip 5. The first magnetic strip 3 and the third magnetic strip 5 are high-permeability strips, while the second magnetic strip 4 is low-permeability strips. This is because the stronger the magnetic permeability of a magnetic strip, the stronger its ability to enhance the magnetic field, and conversely, the weaker the magnetic permeability of a magnetic strip, the weaker its ability to enhance the magnetic field. This configuration avoids the concentration of excessive high-permeability magnetic strips in the central region, thereby improving the outer ring heating effect of the second coil winding 22 and reducing the risk of concentrated heating in the middle.

[0064] In this embodiment, in order to make the mounting bracket 1 and the coil winding 2 have a substantially square shape, the side length of the coil winding 2 is set to A, where 170 mm ≤ A ≤ 260 mm. By constraining the size of the coil winding 2 within this range, it can be adapted to the size of commonly used cookware.

[0065] In this embodiment, the quasi-square shape includes one of a rectangle, a square and a racetrack shape. Of course, the quasi-square shape can refer to a rectangle or a square with certain chamfers, and the chamfers can be arc angles or straight chamfers.

[0066] Please refer to Figure 5. The present invention also provides a cooking utensil, which includes the above-mentioned cooking device. Since the cooking utensil includes the cooking device, the specific structure of the cooking device refers to the above-mentioned embodiment. Since the cooking device of the cooking utensil adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0067] Specifically, the cooking appliance includes an induction cooker or an induction range. When the cooking appliance is an induction cooker, one heating device may be provided; when the cooking appliance is an induction range, multiple heating devices may be provided to achieve multi-head heating. Of course, the configuration and application scenarios of the heating device are not limited to the above examples; specific designs may be tailored to actual circumstances, and this specification is not intended to limit this.

[0068] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A heating device, wherein: The heating device comprises: a mounting bracket, the mounting bracket having corner portions; a coil winding mounted on the mounting bracket; and The magnetic conductive structure is provided on one side of the coil winding, and the magnetic conductive structure includes a first magnetic strip, which extends outward from the middle of the coil winding and extends to the corner.

2. The heating device according to claim 1, wherein The mounting bracket is arranged in a quasi-square shape to have a plurality of first side edges, and the intersection of two adjacent first side edges forms the corner portion.

3. The heating device according to claim 1, wherein The first magnetic strip is arranged in a straight line.

4. The heating device according to claim 1, wherein The first magnetic strip includes a first main section extending from the middle of the coil winding to the corner, and a first protruding section bent from at least one end of the first main section toward the other side of the coil winding, and the first protruding section is located outside the outermost coil of the coil winding.

5. The heating device according to claim 1 or 2, wherein: The mounting bracket has a plurality of corner portions, and correspondingly, a plurality of first magnetic strips are provided.

6. The heating device according to claim 5, wherein The coil winding includes a first coil winding and a second coil winding arranged around the periphery of the first coil winding. The second coil winding is arranged in a square ring shape to have multiple second sides. A chamfer is provided at the intersection of two adjacent second sides, and the chamfer is provided corresponding to the corner portion.

7. The heating device according to claim 6, wherein The magnetic conductive structure further includes a plurality of magnetic strips spaced apart along the circumference of the mounting bracket, and each of the magnetic strips extends from the middle of the coil winding to the circumference thereof.

8. The heating device according to claim 7, wherein: The multiple magnetic strips include multiple second magnetic strips and multiple third magnetic strips, the length of the second magnetic strips is set to be greater than the third magnetic strips, each of the second magnetic strips is located between each adjacent two first magnetic strips, and each of the third magnetic strips is located between the adjacent first magnetic strips and the second magnetic strips.

9. The heating device according to claim 8, wherein Each of the second magnetic strips extends from the inner side of the innermost turn of the first coil winding to the outer side of the outermost turn of the second coil winding; and / or, Each of the third magnetic strips extends from the inner side of the innermost circle of the second coil winding to the outer side of the outermost circle of the second coil winding.

10. The heating device according to claim 9, wherein The second magnetic strip includes a second main section extending from the middle of the coil winding to the corner, and a second protruding section bent from at least one end of the second main section from one side of the coil winding to the other side thereof, and the second protruding section is located on the inner side of the innermost coil of the coil winding.

11. The heating device according to claim 8, wherein The magnetic permeability of each of the second magnetic strips is set to be smaller than that of each of the first magnetic strips and each of the third magnetic strips.

12. The heating device according to claim 1, wherein The coil winding is arranged in a quasi-square shape, and the side length of the coil winding is set to A, wherein 170 mm ≤ A ≤ 260 mm.

13. The heating device according to claim 2 or 12, wherein: The square-like shape includes one of a rectangle, a square and a racetrack shape.

14. A cooking appliance, wherein: The cooking appliance comprises the heating device according to any one of claims 1 to 13.

15. The cooking appliance according to claim 14, wherein The cooking appliance includes an induction cooker or an induction range.

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