Heating coil assembly, household appliance having same, and method of manufacturing same

Abstract

The invention relates to a heating coil assembly, a household appliance with the heating coil assembly and a manufacturing method of the household appliance. The present invention comprises a heating coil formed of a plurality of layers of conductors vertically stacked, in which the horizontal outer shape of the heating coil is a polygon. Accordingly, an increase in the horizontal size of the heating coil is suppressed while increasing the pattern cross-sectional area per turn of the heating coil, and thus an increase in the temperature of the heating coil can be effectively suppressed.

Description

Heating coil assembly, household appliance having the heating coil assembly, and method of manufacturing thereof Technical Field

[0001] This invention relates to a household appliance, and more specifically, to a household appliance comprising a heating coil assembly. Background Technology

[0002] Cooking appliances are a type of household appliance used for cooking food, and are devices installed in the kitchen space to cook food according to the user's intentions. These cooking appliances can be classified differently based on their heat source, shape, or type of fuel used.

[0003] When categorizing cooking appliances according to the type of food being cooked, they can also be classified into open and closed cooking appliances based on the shape of the space where the food is placed. Closed cooking appliances include ovens and microwave ovens, while open cooking appliances include stovetops and grill racks.

[0004] The cooktop in an open-style cooking appliance is configured to heat food contained in a cooking container via at least one cooking zone. Such a cooktop can be provided in the form of a cooking zone that uses electricity, or it can be provided in the form of a cooking zone that uses gas. Alternatively, the cooktop can be implemented independently, or it can be implemented as an oven range that includes an oven underneath the cooktop.

[0005] As an example of a cooktop that includes a cooking area that uses electricity, there exists an induction heating cooking appliance. An induction heating cooking appliance is a cooking appliance that performs cooking functions through an induction heating method. In an induction heating cooking appliance, when an electric current is applied to a heating coil, eddy currents are generated in the cooking container, which is a magnetic material, and the cooking of food can be performed by the cooking container being heated by the resistance acting as the eddy currents.

[0006] Such induction heating cooking appliances do not require the combustion of gases, and therefore do not produce combustion exhaust gases. In addition, induction heating cooking appliances allow heat to be generated instantly within the cooking container itself, thereby minimizing the transfer process through radiation or heat conduction, and thus enabling food to be heated at high speeds.

[0007] Typically, in induction heating cooking appliances, the position to be placed in the cooking vessel is indicated on the top plate above the heating coil, and heating of the cooking vessel is performed by the heating coil while the cooking vessel is placed in the indicated position.

[0008] In induction heating cooking appliances, one or more working coils and circuit boards can be provided. The working coils serve to transmit electromagnetic force to the cooking container. Typically, the working coils can be formed by winding wires in a spiral pattern. Furthermore, the circuit board can electrically control the induced current supplied to the working coils.

[0009] Recently, working coils formed by creating coil-like patterns on circuit boards have been used instead of working coils formed by spirally winding wires.

[0010] The cost and time required to manufacture induction heating cooking appliances are largely comprised of the cost and time invested in manufacturing the working coil. This includes the cost of the wire itself, as well as the considerable cost and time required for winding the wire.

[0011] When the working coil is formed by creating a coil-like pattern on a circuit board, rather than by winding wires, the cost and time required to manufacture the working coil can be reduced.

[0012] High-frequency power is applied to the working coil, thus generating a considerable amount of heat within it. In particular, in induction heating cooking appliances that require high power, a significant amount of heat is generated in the working coil when a correspondingly high power is applied.

[0013] When the working coil is formed in the form of a coil-shaped pattern on a circuit board, due to the limited area of ​​the circuit board, the working coil is inevitably formed in a narrow area of ​​the circuit board. Therefore, a large amount of heat is inevitably applied to the circuit board on which the working coil is formed, relative to its area, and as a result, the temperature of the circuit board increases excessively.

[0014] In addition, in recent years, an induction heating cooking appliance has been developed that automatically recognizes the size and position of the cooking container and performs heating in a form suitable for the cooking container, even when the cooking container is not placed in a specific position. To perform heating more efficiently in this type of induction heating cooking appliance, it is necessary to increase the number of working coils installed in the appliance.

[0015] Therefore, in the above-mentioned types of induction heating cooking appliances, it is difficult to apply working coils with coil patterns due to the temperature rise problem caused by the concentration of coil patterns. Summary of the Invention

[0016] Technical issues

[0017] The purpose of this disclosure is to provide a household appliance with an improved structure that allows for the suppression of temperature rise in a heating coil having a coil pattern.

[0018] Another object of this disclosure is to provide a household appliance with an improved structure, which allows for an improvement in the density of the area occupied by the heating coil in the appliance.

[0019] Another object of this disclosure is to provide a household appliance with an improved structure that allows for the suppression of temperature rise in the heating coils while allowing the heating coils to be arranged more densely.

[0020] Another object of this disclosure is to provide a household appliance with an improved structure that reduces the loss of the original board used to manufacture the coil plate portion, while increasing the density of the area occupied by the heating coil in the appliance.

[0021] Another object of this disclosure is to provide a household appliance with an improved structure that simplifies the connection structure between the heating coil and the electrical components.

[0022] Another object of the present invention is to provide a household appliance having an improved structure, which makes it possible to suppress the reduction of the cross-sectional area of ​​the pattern per turn of the heating coil due to foil loss that occurs during the formation of the coil pattern.

[0023] Another object of this disclosure is to provide a household appliance with an improved structure, such that the appearance of the household appliance is not degraded due to the structure associated with the heating coil.

[0024] Technical solution

[0025] According to one embodiment of the present disclosure, a household appliance for achieving the above-mentioned objective includes a heating coil formed of conductors stacked in multiple layers, wherein the external shape of the heating coil is polygonal.

[0026] Another embodiment of this disclosure includes a heating coil formed by a plurality of patterned coils stacked in a vertical direction, wherein the horizontal external shape of the heating coil is polygonal.

[0027] Another embodiment of this disclosure includes a heating coil formed by stacking patterned coils on a plate in a vertical direction, wherein the horizontal external shape of the heating coil is polygonal.

[0028] Another embodiment of this disclosure includes a heating coil formed of conductors stacked in multiple layers, and a plurality of coil modules including at least one heating coil.

[0029] Another embodiment of this disclosure includes a coil module having at least one heating coil formed by a plurality of patterned coils stacked in a vertical direction, wherein the plurality of coil modules are arranged in a horizontal direction.

[0030] Another embodiment of this disclosure includes a rectangular coil module having a heating coil with a horizontally rectangular external shape, wherein a plurality of coil modules are arranged in a line along a horizontal direction.

[0031] Another embodiment of this disclosure includes a coil module having at least one heating coil formed by a plurality of patterned coils stacked in a vertical direction, wherein the plurality of heating coils are arranged in a horizontal direction.

[0032] Another embodiment of this disclosure includes a coil module having at least one heating coil, wherein a plurality of coil portions stacked in a vertical direction are connected in a vertical direction to form a heating coil, respectively.

[0033] Another embodiment of this disclosure includes a heating coil formed by stacking a plurality of first coil plates, wherein the external shape of the heating coil is polygonal.

[0034] Another embodiment of this disclosure includes a coil plate portion and an adhesive material, the coil plate portion having a pair of coil portions patterned on opposite sides of the core in a vertical direction, the adhesive material being stacked together with a plurality of coil plates in a vertical direction to join the coil plates portion, wherein the adhesive material is arranged between a pair of coil portions facing each other in a vertical direction to form an insulating layer therebetween.

[0035] Another embodiment of this disclosure includes a coil module having at least one heating coil, wherein the coil module includes a mask covering the uppermost and lowermost outer surfaces of the coil plate stack in the vertical direction, and the mask is formed in a low-brightness color.

[0036] Another embodiment of this disclosure includes a coil plate stack formed by stacking coil patterns in a vertical direction, and a vertical connecting portion connecting a plurality of coil patterns stacked in a vertical direction, wherein the vertical connecting portion includes through holes connecting a plurality of coil patterns in a vertical direction, and a plurality of through holes arranged in a horizontal direction in each vertical connecting portion are connected to each other.

[0037] Another embodiment of this disclosure includes a coil module having at least one heating coil, wherein the heating coil is formed by coil patterns respectively patterned on a plurality of coil plates stacked in a vertical direction, and the upper and lower cross-sectional shapes of the coil patterns are formed into polygonal shapes, wherein the length of the top side is less than the length of the bottom side.

[0038] A household appliance according to one aspect of this disclosure may include: a plurality of coil plates stacked in a vertical direction to form a heating coil; and an adhesive material stacked together with the coil plates in the vertical direction to connect the coil plates. Each of the coil plates may include a core and a pair of coil portions patterned on both sides of the core in the vertical direction.

[0039] Preferably, the adhesive material is disposed between the pair of coil portions facing each other in the vertical direction to form an insulating layer between the pair of coil portions.

[0040] Furthermore, the coil plate portion preferably includes a copper-clad laminate comprising a core and foils arranged on both sides of the core in the vertical direction.

[0041] Furthermore, the coil portion is preferably formed by patterning the foil plated on the core into a coil shape.

[0042] Furthermore, the core is preferably formed from FR4 prepreg.

[0043] Furthermore, the adhesive material is preferably formed from a prepreg material.

[0044] Furthermore, the adhesive material preferably comprises a plurality of prepreg films stacked in the vertical direction.

[0045] Furthermore, the thickness of the adhesive material is preferably greater than the thickness of the core.

[0046] Furthermore, the thickness of the adhesive material is preferably greater than the thickness of the coil portion.

[0047] Furthermore, the thickness of the adhesive material is preferably greater than or equal to twice the thickness of the coil portion.

[0048] Furthermore, multiple coil plates are preferably stacked in the vertical direction to form a coil module, and the thickness of the coil module is preferably 3.2 mm to 3.8 mm.

[0049] Furthermore, four to six coil plates are preferably stacked in the vertical direction.

[0050] In addition, the thickness of each core is preferably from 0.09 mm to 0.11 mm.

[0051] Furthermore, the thickness of each coil portion is preferably 0.10 mm to 0.11 mm.

[0052] Furthermore, the thickness of each adhesive material is preferably between 0.28 mm and 0.36 mm.

[0053] In addition, each adhesive material preferably comprises four prepreg films stacked in the vertical direction.

[0054] Furthermore, the thickness of each prepreg film is preferably from 0.07 mm to 0.09 mm.

[0055] Furthermore, the thickness of the coil module formed by stacking 10 coil portions in the vertical direction is preferably 3.2 mm to 3.4 mm, or the thickness of the coil module formed by stacking 12 coil portions in the vertical direction is preferably 3.6 mm to 3.8 mm.

[0056] Furthermore, the coil module is preferably formed by a coil plate stack, which is formed by stacking multiple coil plates in the vertical direction.

[0057] In addition, the coil module may include an outer layer disposed on the outer side of the coil plate stack in the vertical direction.

[0058] Furthermore, the coil portion and the outer layer portion are preferably connected in the vertical direction to form a heating coil.

[0059] Furthermore, the coil plate stack is preferably arranged between a pair of pairs of layers that are spaced apart from each other in the vertical direction.

[0060] Furthermore, the total number of coil sections and outer layers is an even number.

[0061] Furthermore, the adhesive material is preferably disposed between the coil plate stack and the outer layer.

[0062] Furthermore, the adhesive material preferably forms an insulating layer between the coil portion and the outer layer, and connects the coil plate stack and the outer layer.

[0063] Furthermore, the coil portion and the insulation layer are preferably arranged alternately in the vertical direction.

[0064] Furthermore, the insulating layer is preferably formed from a core and an adhesive material, respectively.

[0065] Furthermore, a method for manufacturing a heating coil assembly according to one aspect of this disclosure may include: a coil forming step, wherein the coil forming step forms coil portions on each of a plurality of coil plates; a stacking step, wherein the stacking step stacks the plurality of coil plates in a vertical direction to form a coil plate stack; and a connecting step, wherein the connecting step connects the plurality of coil portions stacked in the vertical direction along the vertical direction.

[0066] Furthermore, the stacking step preferably includes stacking the coil plate and adhesive material in a vertical direction such that the coil plate and adhesive material are stacked alternately, followed by heating and pressurization.

[0067] Furthermore, in the stacking step, the multiple coil plates stacked in the vertical direction are preferably connected to each other by an adhesive material to form a coil plate stack, and an insulating layer is preferably formed between a pair of coil portions facing each other in the vertical direction.

[0068] Furthermore, the stacking step preferably includes: stacking four prepreg films vertically between a pair of coil plates stacked vertically, wherein the thickness of each coil portion is 0.10 mm to 0.11 mm, and the thickness of each prepreg film is 0.07 mm to 0.09 mm.

[0069] Furthermore, the connection step may include a hole forming step in forming a hole portion in the coil plate stack, the hole portion being connected to the plurality of coil portions stacked in the vertical direction.

[0070] In addition, the connection step may include a via forming step, which forms a via in the hole portion.

[0071] Furthermore, this disclosure may further include an outer layer forming step, which forms an outer layer on the outer side of the coil plate stack in the vertical direction.

[0072] Furthermore, the stacking step preferably includes stacking coil plates and foils such that multiple coil plates are arranged between a pair of foils, followed by heating and pressurization.

[0073] Furthermore, the outer layer forming step preferably includes processing the foil into a coil shape to form the outer layer.

[0074] Beneficial effects

[0075] This disclosure forms a heating coil in the form of a patterned coil by connecting multiple coil patterns stacked in the vertical direction, and thereby allows for an effective increase in the patterned cross-sectional area per turn of the heating coil by increasing the length of the heating coil in the vertical direction.

[0076] According to this disclosure, by increasing the pattern cross-sectional area of ​​each turn of the heating coil while suppressing the increase in the horizontal dimension of the heating coil, the temperature rise of the heating coil can be effectively suppressed.

[0077] Furthermore, according to this disclosure, since the heating coil disposed in the coil module which is formed in a polygonal shape similar to the external shape of the stove is formed in a polygonal shape similar to the external shape of the coil module, the density of the area occupied by the heating coil in the stove can be effectively increased.

[0078] Therefore, this disclosure can improve the heating efficiency of household appliances by increasing the size of the area in which the heated object contacts the heating coil.

[0079] In addition, this disclosure allows for the formation of a heating coil by connecting multiple coil wires stacked vertically in the vertical direction, and by forming horizontal and vertical twisted structures in the heating coil, it allows for an increase in the patterned cross-sectional area of ​​each turn of the heating coil while minimizing the increase in the horizontal dimension of the heating coil.

[0080] According to this disclosure, by reducing the size of the heating coil and simultaneously reducing the density of the current flowing through the heating coil, the heating coil can be arranged more densely compared to a stove of the same size, and the maximum output can be maintained for a longer period of time compared to a stove of the same size.

[0081] Therefore, this disclosure can provide improved heating efficiency by using densely arranged small heating coils WC, and can also provide higher output over a longer period of time.

[0082] Furthermore, this disclosure allows the heating coil assembly to be formed as a combination of multiple coil modules, thereby allowing for a reduction in the loss of the original board used to manufacture the coil modules and allowing for efficient assurance of the space required to arrange the cooktop control panel on the cooktop.

[0083] Furthermore, according to this disclosure, the wiring for connecting the heating coil and the sensing coil to the connector is patterned on the coil module itself, and the connection between the heating coil and the sensing coil and the electrical component can be achieved solely through the connection between the connector and the electrical component. Therefore, the connection structure between the heating coil and the sensing coil and the electrical component can be formed very simply.

[0084] Therefore, this disclosure can provide the effect that not only does it allow for easy and quick connection between the heating coil assembly and the electrical components, but it also prevents the internal space of the stove, which houses the heating coil assembly and the electrical components, from becoming complicated by a large amount of wiring.

[0085] Furthermore, this disclosure allows the first vertical connection portion to include multiple vias, and through these vias, it allows for an increase in the amount of conductor disposed in the vias, thereby effectively reducing the resistance and heat generation occurring in the first vertical connection portion.

[0086] In addition, the heating coil of this disclosure can be formed to satisfy the following condition, wherein the length of the bottom edge of the coil pattern is set to be in the range of 1.47 to 1.57 times the thickness of the coil pattern.

[0087] The heating coil disclosed herein can be formed to have a sufficient pattern cross-sectional area per turn required to effectively suppress the temperature rise of the heating coil, even when the length of the top edge is more than 20% shorter than the bottom edge during the coil pattern formation process.

[0088] Furthermore, this disclosure allows the surface of the coil module formed by the mask to be formed in the same or similar color as the cover, and thereby allows the heating coil assembly to be arranged inside the stove, making it less visible from the outside of the stove, thus effectively suppressing the deterioration of the appearance of the household appliance due to the heating coil assembly. Attached Figure Description

[0089] Figure 1 is a perspective view of a household appliance according to one embodiment of the present disclosure; Figure 2 is a plan view showing the stove shown in Figure 1 in a separated state; Figure 3 is a view showing the indicator light of the stove shown in Figure 2 in the illuminated state; Figure 4 is an exploded perspective view showing the stove shown in Figure 2 in an exploded state; Figure 5 is a view showing the state in which electrical components are mounted on the lower surface of the support shown in Figure 4; Figure 6 is a plan view schematically showing the structure of the heating coil assembly shown in Figure 4; Figure 7 is a cross-sectional view schematically showing the stacked structure of the coil modules shown in Figure 6; Figure 8 is a plan view showing a first example of the arrangement structure of the first coil module and the second coil module; Figure 9 is a schematic view showing the original... Figure 10 is a plan view showing an example of the arrangement of the first and second coil modules; Figure 11 is a plan view showing another example of the arrangement of the first and second coil modules shown in Figure 8; Figure 12 is a plan view showing another example of the arrangement of the first and second coil modules shown in Figure 10; Figure 13 is a plan view showing a third example of the arrangement of the first and second coil modules; Figure 14 is a plan view showing a fourth example of the arrangement of the first and second coil modules; Figure 15 is a plan view showing a fifth example of the arrangement of the first and second coil modules; Figure 16 shows a plan view showing the first and second coil modules... Figure 17 is a plan view of a sixth example of the module arrangement structure; Figure 18 is an enlarged view of a portion of the first coil plate shown in Figure 17; Figure 19 is a cross-sectional view schematically showing the stacked structure of the first coil portion shown in Figure 18; Figure 20 is a plan view showing an example of the arrangement structure of the sensing coils; Figure 21 is an enlarged view of a portion of Figure 20, showing an example of the arrangement structure of the sensing coils relative to the heating coils; Figure 22 is an enlarged view of the first terminal shown in Figure 18; Figure 23 is an enlarged view of the second terminal shown in Figure 18; Figure 24 shows the first coil module and the second coil module. Figure 25 is a plan view of a seventh example of the arrangement structure; Figure 26 is a diagram showing an example of the drive circuit and load circuit shown in Figure 25; Figure 27 is a plan view showing an example of a heating coil; Figure 28 is a plan view showing another example of a heating coil; Figure 29 is an enlarged view of the first coil portion; Figure 30 is a diagram showing an example of the connection structure between the coil pattern stack and the first vertical connection portion; Figure 31 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connection portion shown in Figure 30; Figure 32 is a diagram showing another example of the connection structure between the coil pattern stack and the first vertical connection portion.Figure 33 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connection shown in Figure 32; Figure 34 is a diagram showing another example of the first vertical connection; Figure 35 is a diagram showing an example of the connection structure between the coil pattern stack and the first vertical connection shown in Figure 34; Figure 36 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connection shown in Figure 35; Figure 37 is a diagram showing another example of the connection structure between the coil pattern stack and the first vertical connection shown in Figure 34; Figure 38 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connection shown in Figure 37; Figure 39 is yet another example of the connection structure between the coil pattern stack and the first vertical connection. Figure 40 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connection shown in Figure 39; Figure 41 is a diagram showing another example of the connection structure between the coil pattern stack and the first vertical connection; Figure 42 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connection shown in Figure 41; Figure 43 is a cross-sectional view showing an example of the stacked structure of the second outer layer and the second coil plate; Figure 44 is an enlarged view of a portion of the second outer layer; Figure 45 is an enlarged view of a portion of the second coil plate; Figure 46 is an enlarged view of a portion of the first coil plate; Figure 47 shows the second terminal and the second connection in a separated state; Figure 48 schematically shows the structure of Figure 47. Figure 49 is a cross-sectional view showing the stacked structure of the second terminal and the second connector; Figure 50 is a cross-sectional view schematically showing an example of the stacked structure of the heating coil assembly shown in Figure 49; Figure 51 is a cross-sectional view schematically showing the heating coil assembly covered by the top plate; Figure 52 is a cross-sectional view schematically showing another example of the stacked structure of the heating coil assembly shown in Figure 49; Figure 53 is a flowchart schematically showing the manufacturing process of the coil plate stack according to one embodiment of the present disclosure; Figure 54 is a flowchart schematically showing the progress of the connection step shown in Figure 53; Figure 55 is a diagram showing an example of the heating coil assembly according to one embodiment of the present disclosure. Figure 56 is a diagram showing the first coil module shown in Figure 55 in a separated state; Figure 57 is a diagram showing the second coil module shown in Figure 55 in a separated state; Figure 58 is a diagram showing the heating coil shown in Figure 55 in a separated state; Figure 59 is a cross-sectional view schematically showing an example of the per-turn arrangement structure of the first coil portion; Figure 60 is a cross-sectional view schematically showing another example of the per-turn arrangement structure of the first coil portion; Figure 61 is an enlarged cross-sectional view of the stacked structure of the heating coil assembly; Figure 62 is a cross-sectional view showing the vertical cross-sectional shape of the patterned coil; Figure 63 is an enlarged view of the patterned coil shown in Figure 62; Figure 64 is a table comparing a patterned coil according to one embodiment of the present disclosure with a comparative example;Figure 65 is an enlarged cross-sectional view showing the vertical cross-sectional shape of a patterned coil formed by etching; and Figure 66 is a cross-sectional view showing another example of a patterned coil formed by etching. Detailed Implementation

[0090] The above aspects, features, and advantages will now be described in detail with reference to the accompanying drawings, so that those skilled in the art to which this disclosure pertains can readily grasp the technical spirit of this disclosure. In this disclosure, detailed descriptions of known technologies relating to the subject matter of this disclosure are omitted if they are deemed to unnecessarily obscure the key points of this disclosure. Hereinafter, preferred embodiments according to this disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals may denote the same or similar components.

[0091] The terms "first," "second," etc., are used herein only to distinguish one component from another. Therefore, these components are not limited by these terms. Of course, a first component can be a second component unless otherwise stated.

[0092] The implementation methods are not limited to those described herein and can be modified and changed in various different forms. The implementation methods in this disclosure are provided so that this disclosure can fully and completely convey its scope to those skilled in the art. Therefore, within the spirit and scope of this disclosure, all modifications, equivalents, or substitutions of the configuration of any implementation method, as well as replacing the configuration of any implementation method with the configuration of another implementation method or adding the configuration of any implementation method to the configuration of another implementation method, will be included within the scope of this disclosure.

[0093] The accompanying drawings are provided to better understand the embodiments set forth herein and are not intended to limit the technical spirit of this disclosure. It should be understood that all modifications, equivalents, or substitutions within the spirit and scope of this disclosure are included within its scope. The dimensions or thicknesses of components in the drawings have been exaggerated or reduced for ease of understanding, etc. However, the scope of protection of the subject matter of this disclosure should not be interpreted in a limiting manner.

[0094] The terminology used in this disclosure is for describing specific embodiments or implementations only and is not intended to limit the subject matter of this disclosure. In this disclosure, the singular form includes the plural form as well as the singular form, unless otherwise expressly indicated. In this disclosure, the terms "comprise," "comprised of," etc., specify the presence of the stated feature, integral, step, operation, element, component, or combination thereof, but do not imply the exclusion or addition of one or more other features, integrals, steps, operations, elements, components, or combinations thereof.

[0095] The terms “first,” “second,” etc., are used here only to distinguish one component from another, and these components are not limited by these terms.

[0096] When any component is described as "connected" or "linked" to another component, either component can be directly connected or linked to the other component. However, an additional component can be "inserted" between the two components, or the two components can be "connected" or "linked" through an additional component. When any component is described as "directly connected" or "directly linked" to another component, an additional component cannot be "inserted" between the two components, or the two components cannot be "connected" or "linked" by an additional component.

[0097] When any component is described as being "above (or below)" another component, any component can be directly above (or below) the other component, and additional components can be inserted between the two components.

[0098] Unless otherwise defined, all terms used herein (including technical or scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. Furthermore, terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant field, and should not be interpreted in an idealized or overly formal manner unless explicitly defined herein.

[0099] With the cooking appliance standing upright on the floor, the direction in which the door is installed relative to the center of the appliance is defined as the forward direction. Therefore, the direction towards the inside of the cooking appliance when the door is open is defined as the backward direction. For convenience, the forward and backward directions can be referred to as the first direction.

[0100] Then, the forward direction is called one direction of the first direction, and the backward direction is called another direction of the first direction.

[0101] In addition, the direction of gravity can be defined as downward, and the direction opposite to the direction of gravity can be defined as upward.

[0102] Furthermore, the horizontal direction spanning the front and back of the cooking appliance, that is, the width of the cooking appliance when viewed from the front of the appliance's door, can be referred to as the left and right direction. For convenience, the left and right direction can be called the second direction. Then, the right side can be called one direction of the second direction, and the left side can be called the other direction of the second direction.

[0103] In addition, the width direction of a cooking utensil can also be referred to as the horizontal direction. Furthermore, the right side can be referred to as one side of the horizontal direction, and the left side can be referred to as the other side of the horizontal direction.

[0104] Furthermore, the up and down directions can be referred to as a third direction. Thus, the upward direction can be considered one direction of the third direction, and the downward direction can be considered another direction of the third direction.

[0105] Furthermore, the up-down direction can be referred to as the vertical direction. Then, the front-back direction and the left-right direction (i.e., the first direction and the second direction) can be referred to as the horizontal direction.

[0106] Throughout this disclosure, unless otherwise stated, the term “A and / or B” as used herein may mean A, B, or A and B, and the term “C to D” may mean above C and below D.

[0107] [The overall structure of home appliances]

[0108] Figure 1 is a perspective view of a household appliance according to one embodiment of the present disclosure, Figure 2 is a plan view showing the stove shown in Figure 1 in a separated state, and Figure 3 is a diagram showing the indicator light of the stove shown in Figure 2 in the lit state.

[0109] As an example, a household appliance can be a cooking appliance that includes a stovetop. However, the household appliances of this disclosure are not limited to cooking appliances, and various types of appliances such as washing machines, water purifiers, dryers, or garment care devices can be used as household appliances of this disclosure. Hereinafter, embodiments of the household appliances of this disclosure will be described using cooking appliances as an example.

[0110] Referring to Figures 1 to 3, the cooking appliance according to this embodiment may include a cooktop 100. Furthermore, the cooking appliance according to this embodiment may also include an oven section 10. In this embodiment, the cooking appliance is shown as being provided in the form of an oven range.

[0111] The cooking appliance according to this embodiment, provided in the form of an oven range, can provide the functions of an oven as a closed cooking appliance and a stove as an open cooking appliance. Such a cooking appliance may include an oven section 10 and a stove 100.

[0112] The cooking chamber can be formed inside the oven section 10. In the oven section, food can be cooked while the interior of the cooking chamber is being heated.

[0113] The oven section 10 may be equipped with a heating element for heating the cooking chamber. The heating element may be a gas-fueled heating device or an electric heater.

[0114] The cooking appliance may be provided with a door 11 configured to selectively open and close the cooking chamber, and configured to be rotatable. As an example, the door may be configured to open and close the cooking chamber by a pull-down method, in which the upper portion of the door rotates up and down about its lower portion.

[0115] A control panel 13 (hereinafter referred to as the "main control panel") may be located on the upper front part of the cooking appliance. The main control panel 13 may form part of the front exterior of the cooking appliance. The main control panel 13 may be equipped with various switches for controlling the operation of the cooking appliance and a display for showing the operating status of the cooking appliance.

[0116] The cooktop 100 can be positioned above the oven section 10. The cooktop is configured to heat food or food containers placed on the upper part of the cooktop 100.

[0117] [Overall structure of the stove]

[0118] Figure 4 is an exploded perspective view of the stove shown in Figure 2 in an exploded state, and Figure 5 is a diagram showing the electrical components installed on the lower surface of the support shown in Figure 4.

[0119] Referring to Figures 1 to 5, the stove 100 may include a housing 110 and a top plate 120. According to this embodiment, the exterior of the stove 100 can be formed by the housing 110 and the top plate 120. The housing 110 is disposed below the top plate 120 and can form the front surface, rear surface, side surface, and bottom surface of the stove. The top plate 120 is disposed at the upper end of the stove 100 and can form the upper outer surface of the stove 100.

[0120] An accommodating space can be formed inside the housing 110. The accommodating space formed within the housing 110 may open upwards. As an example, the housing 110 may be formed in a hexahedral shape with an upward opening. Various internal components constituting the cooktop 100 can be accommodated in the accommodating space surrounded by the top plate 120 and the housing 110.

[0121] According to this embodiment, the housing 110 may include a bottom 111. The bottom 111 forms the bottom surface of the housing 110 and may define the lower boundary surface of the accommodating space. The bottom 111 is disposed below the top plate 120 and may form a plane parallel to the top plate 120.

[0122] Additionally, the housing 110 may include sidewalls 113. Sidewalls 113 may form the front surface, rear surface, and two side surfaces of the housing 110, and may be formed as vertical walls extending upward from the edge of the bottom 111. Sidewalls 113 may define the horizontal boundary surfaces of the accommodating space.

[0123] Additionally, the cooktop 100 may be equipped with a heating element for heating food to be cooked or a container for holding food (hereinafter referred to as "heating object"). The heating element may include at least one cooking area. For example, the cooking area may be provided in the form of a heating coil or heating wire coil that uses electricity.

[0124] In this embodiment, the cooktop 100 is shown as being provided as an induction heating cooking appliance. The cooking area of ​​the cooktop 100 may include a heating coil. Accordingly, the cooking area including the heating coil can be operated by a high-frequency current applied by an inverter to generate a strong magnetic flux.

[0125] The magnetic flux lines generated in the cooking zone, which includes heating coils, can create eddy currents in the container. As the eddy currents flow through the container, they can generate heat to heat the container, and when the container is heated, the food contained within it can be heated.

[0126] Furthermore, the stove 100 according to this embodiment may include a control panel 130 (hereinafter referred to as the "stove control panel"). The stove control panel 130 may be arranged on the top plate 120. The stove control panel 130 may be provided with an operating part including various switches for controlling the operation of the stove 100, and a display for displaying the operating status of the stove 100, etc.

[0127] The cooktop 100 may be equipped with multiple indicator lights L. The indicator lights L may be displayed on the top plate 120 of the cooktop. The indicator lights L may display information related to the location of the food to be heated or the cooking container holding the food (hereinafter referred to as the "heating object"), the heating status of the heating object, the temperature, etc.

[0128] The stove 100 according to this embodiment may include a heating coil assembly 140. The heating coil assembly 140 is configured to constitute the heating part of the stove 100 and may be disposed in a receiving space inside the stove 100.

[0129] Additionally, the cooktop 100 may include a support member 150. The support member 150 may be arranged below the top plate 120. The support member 150 may be disposed in the space surrounded by the top plate 120 and the housing 110, i.e., in the receiving space.

[0130] The support member 150 can form a frame inside the cooktop 100, which supports the various internal components that make up the cooktop. As an example, the support member 150 can be formed into a hexahedral shape with an opening on the lower side. For example, the support member 150 can be formed into a shape that is essentially obtained by vertically flipping the housing 110, and can be formed into a size that is slightly smaller than the size of the housing 110.

[0131] According to this embodiment, the accommodating space can be formed inside the support member 150, and can be formed as a space surrounded by the bottom 111 of the housing 110 and the support member 150. That is, various internal components constituting the stove 100 can be accommodated inside the support member 150.

[0132] According to this embodiment, the support member 150 can also provide a coil base function. That is, the ferrite core 160 can be mounted on the support member 150, and the heating coil assembly 1000 can be mounted above the support member 150 on which the ferrite core 160 is mounted.

[0133] As an example, the ferrite core 160 can be formed by a combination of multiple ferrite modules 161 provided as a separate body. That is, the ferrite core 160 can be provided in a structure that can be separated into multiple ferrite modules 161.

[0134] In this embodiment, each ferrite module 161 is shown as being configured to be connected to a support 150. For this purpose, the support 150 may be formed with a structure for engaging with the ferrite modules 161. Each ferrite module 161 can be connected to the support 150 by being assembled into this structure.

[0135] Each ferrite module 161 includes ferrite capable of forming a magnetic field around the ferrite module 161. As an example, 161 may be provided in a form in which the ferrite is inserted into a mold.

[0136] The ferrite core 160, formed by combining multiple ferrite modules 161 as described above, reduces the work required to install the ferrite core 160 in the cooktop 100. Furthermore, the ferrite core 160 has the advantage that when a portion of it is damaged, it can be repaired by replacing the ferrite module 161 corresponding to the damaged portion.

[0137] Each indicator light L can be implemented by an illumination module 180. The illumination module 180 is configured to emit light toward the light display area of ​​the top panel 120. As an example, the indicator light L can be implemented by light emitted from the illumination module 180 illuminating the light display area of ​​the top panel 120.

[0138] In this embodiment, the light display area is defined as the area where the light emitted from the lighting module 180 can be identified from the outside via the top plate 120, that is, the area on the top plate 120 illuminated by the light emitted from the lighting module 180, and is a predetermined portion of the entire area of ​​the top plate 120.

[0139] As an example, the light display area can be a virtual area designated as a portion of the top plate 120, onto which light emitted from the lighting module 180 is irradiated. In this case, the light display area is not a portion visiblely marked on the top plate 120 by a separate surface treatment on the surface of the top plate 120, but simply corresponds to the virtual area.

[0140] As another example, the light display area may be an area that is visiblely marked on the top plate 120 by a separate surface treatment on the surface of the top plate 120.

[0141] The lighting module 180 may include a light source. For example, an LED may be used as a light source, but the type of light source that can be used as a light source is not limited to LEDs.

[0142] The lighting module 180 may include multiple light sources, and in each lighting module 180, the multiple light sources may be arranged to be spaced apart from each other in the front-to-back direction by a predetermined interval. As an example, the lighting module 180 may be provided in the form of a PCB on which multiple light sources are mounted. The number of light sources for each lighting module 180 and the length of the PCB in the front-to-back direction may be appropriately set according to the size and intensity of the illumination to be achieved by the lighting module 180.

[0143] Furthermore, multiple lighting modules 180 can be arranged in the stovetop, and the multiple lighting modules 180 can be arranged to be spaced apart from each other by a predetermined interval in the lateral direction. The number of lighting modules 180 and the interval between lighting modules 180 can be appropriately set by taking into account the size of the heating coil, the number of heating coils, the interval between the heating coils, etc.

[0144] At least a portion of the lighting module 180 may be arranged between the support 150 and the bottom 111. As an example, the lighting module 180 may be arranged in a receiving space. More specifically, the lighting module 180 may be arranged in a space surrounded by the bottom 111 of the housing 110 and the support 150.

[0145] Inside the cooktop 100, within its storage space, various electrical components can be installed. For example, the main PCB 171, switching power supply (SMPS) 162, inverter PCB 163, resonant PCB 164, noise filter (EMI filter) 165, fan 176, etc., can be installed within the interior space of the cooktop 100.

[0146] In the following text, the aforementioned electrical components will be collectively referred to as electrical section 170. Electrical section 170 may include at least one of a power processing section and a coil controller. A power processing section is provided to supply power to the heating coil assembly 1000, and the power processing section may include a switching power supply (SMPS) 162, an EMI filter 165, etc. A coil controller is provided to control the operation of the heating coil assembly 1000, and the coil controller may include an inverter PCB 174, etc.

[0147] [Overall structure of the heating coil assembly]

[0148] Figure 6 is a schematic diagram showing the construction of the heating coil assembly shown in Figure 4, and Figure 7 is a schematic cross-sectional view showing the stacked structure of the coil modules shown in Figure 6.

[0149] Referring to Figures 4 and 6, the heating coil assembly 1000 may include a plurality of heating coils WC arranged in a horizontal direction. For example, in the heating coil assembly 1000, the plurality of heating coils WC may be arranged in a first direction (i.e., the transverse direction), and the plurality of heating coils WC may also be arranged about a second direction (i.e., the front-back direction).

[0150] The heating coil assembly 140 may include at least one coil module 1001, 1003. In this embodiment, the heating coil assembly 140 is shown as including a plurality of coil modules 1001, 1003.

[0151] As an example, the heating coil assembly 140 may include a plurality of coil modules 1001, 1003 arranged in a horizontal direction. For example, the heating coil assembly 140 may include a plurality of coil modules 1001, 1003 arranged in a first direction.

[0152] In each coil module 1001, 1003, as shown in Figures 6 and 7, multiple heating coils WC can be arranged horizontally. Each heating coil WC can be provided in the form of a spiral coil patterned on a printed circuit board. That is, the heating coil 142 can be provided in a patterned form formed on the coil modules 1001, 1003.

[0153] Each coil module 1001, 1003 may include a coil plate stack 1010. The coil plate stack 1010 may include a plurality of first coil plate portions 1100 stacked in the vertical direction.

[0154] Each first coil plate portion 1100 may include a first coil portion 1120. As an example, the first coil portion 1120 may be formed by patterning metal foil stacked on the surface of the first coil plate portion 1100 into a spiral coil shape.

[0155] According to this embodiment, a plurality of first coil plates 1100 can be stacked vertically to form a coil module 1001, 1003, and correspondingly, a plurality of first coil portions 1120 can be stacked vertically. The plurality of first coil portions 1120 stacked vertically can be connected to each other vertically to each form a heating coil WC.

[0156] Furthermore, in each of the first coil plate portions 1100, a plurality of first coil portions 1120 may be arranged in a horizontal direction, and therefore, each coil module 1001, 1003 may include a plurality of heating coils WC arranged in a horizontal direction.

[0157] Additionally, the heating coil assembly 1000 according to this embodiment may include a sensing coil SC for sensing the presence of a heated object, as shown in Figures 6 and 7. Each coil module 1001, 1003 may include a plurality of sensing coils SC arranged in a horizontal direction. As an example, in the heating coil assembly 1000, the plurality of sensing coils SC may be arranged along a first direction (i.e., the lateral direction), and the plurality of sensing coils SC may also be arranged about a second direction (i.e., the front-back direction).

[0158] Each sensing coil SC can be provided in the form of a spiral coil patterned on a printed circuit board. That is, the sensing coil SC can be provided in the form of a pattern formed on coil modules 1001, 1003.

[0159] According to this embodiment, the coil plate stack 1010 may include at least one second coil plate portion 1200. The second coil plate portion 1200 may be stacked together with the first coil plate portion 1100 in the vertical direction. That is, at least one second coil plate portion 1200 and a plurality of first coil plate portions 1100 may be stacked in the vertical direction to form a coil module 1001, 1003. Therefore, in each coil module 1001, 1003, at least a portion of the heating coil WC and the sensing coil SC may be arranged in the vertical direction.

[0160] Each second coil plate portion 1200 may include a second coil portion 1220. As an example, the second coil portion 1220 may be formed by patterning a metal foil stacked on the surface of the second coil plate portion 1200 into a spiral coil shape.

[0161] Each sensing coil SC can be formed from a second coil portion 1220, or it can be formed as a result of connecting multiple second coil portions 1220 stacked in the vertical direction.

[0162] Furthermore, in each of the second coil plate portions 1200, a plurality of second coil portions 1220 may be arranged in the horizontal direction, and therefore, each coil module 1001, 1003 may include a plurality of sensing coils SC arranged in the horizontal direction.

[0163] Furthermore, the heating coil assembly 1000 according to this embodiment may also include a temperature sensor TS. The temperature sensor TS is used to measure the temperature of the object being heated and may be arranged on the second coil plate portion 1200.

[0164] The temperature sensor TS can be arranged inside the sensing coil SC in the horizontal direction. For example, the temperature sensor TS can be mounted on the second coil plate 1200 and can be arranged in the area surrounded by the sensing coil SC.

[0165] [Arrangement structure of coil modules]

[0166] Figure 8 is a plan view showing a first example of the arrangement structure of the first coil module and the second coil module, and Figure 9 is a diagram schematically showing an example of the original plate cutting state for forming the first coil plate portion. Furthermore, Figure 10 is a plan view showing a second example of the arrangement structure of the first coil module and the second coil module, Figure 11 is a plan view showing another example of the arrangement structure of the first coil module and the second coil module shown in Figure 8, and Figure 12 is a plan view showing another example of the arrangement structure of the first coil module and the second coil module shown in Figure 10. Additionally, Figure 13 is a plan view showing a third example of the arrangement structure of the first coil module and the second coil module, and Figure 14 is a plan view showing a fourth example of the arrangement structure of the first coil module and the second coil module. Furthermore, Figure 15 is a plan view showing a fifth example of the arrangement structure of the first coil module and the second coil module, and Figure 16 is a plan view showing a sixth example of the arrangement structure of the first coil module and the second coil module.

[0167] Referring to Figures 4 and 8, the heating coil assembly 1000 according to this embodiment includes a plurality of coil modules 1001 and 1003, and the plurality of coil modules 1001 and 1003 can be arranged in a horizontal direction in the heating coil assembly 1000. For example, in the heating coil assembly 1000, the plurality of coil modules 1001 and 1003 can be arranged in a first direction.

[0168] As described above, the stove 100 according to this embodiment may include a stove control panel 130. The stove control panel 130 may be arranged on the top plate 120 and may be arranged at a position offset to the front.

[0169] Regarding the first orientation, the cooktop control panel 130 can be positioned approximately at the center of the heating coil assembly 1000. Regarding the second orientation, the cooktop control panel 130 can be positioned offset towards the front of the heating coil assembly 1000.

[0170] The heating coil assembly 1000 is located below the top plate 120, but not below the area of ​​the top plate 120 occupied by the cooktop control panel 130. That is, the heating coil WC is only located below the area of ​​the top plate 120 not occupied by the cooktop control panel 130, and not below the area of ​​the top plate 120 occupied by the cooktop control panel 130.

[0171] The heating coil assembly 1000 may include various types of coil modules 1001 and 1003 with different sizes. In this embodiment, the coil modules 1001 and 1003 are shown as including a first coil module 1001 and a second coil module 1003. In this case, the first coil module 1001 includes a plurality of heating coils WC, and the second coil module 1003 includes fewer heating coils WC than the first coil module 1001.

[0172] According to this embodiment, in the heating coil assembly 1000, the first coil module 1001 and the second coil module 1003 can be arranged in a horizontal direction. Furthermore, regarding the second direction, the length of the second coil module 1003 can be set to be shorter than the length of the first coil module 1001. That is, the second coil module 1003 can be provided in a form that has a shorter length in the second direction than the first coil module 1001 and includes a smaller number of heating coils WC.

[0173] In the heating coil assembly 1000, a pair of first coil modules 1001 and at least one second coil module 1003 may be arranged along a first direction. In this case, the pair of first coil modules 1001 may be arranged to be spaced apart along the first direction. At least one second coil module 1003 may be arranged between the pair of first coil modules 1001.

[0174] For example, at least one second coil module 1003 may be arranged at the center of the heating coil assembly 1000 in a first direction, similar to the cooktop control panel 130. The at least one second coil module 1003 and the cooktop control panel 130 may be arranged in the same straight line in the second direction.

[0175] Regarding the first direction, the cooktop control panel 130 can be arranged between the pair of first coil modules 1001. Furthermore, regarding the second direction, the cooktop control panel 130 can be arranged at a position offset to one side relative to the second coil module 1003, for example, in front of the second coil module 1003. Therefore, at least a portion of the cooktop control panel 130 can be arranged within the area surrounded by the pair of first coil modules 1001 and second coil modules 1003.

[0176] That is, the cooktop control panel 130 is positioned where the user can clearly see the visual information provided by the cooktop control panel 130 and where the user can easily operate the cooktop control panel 130. The cooktop control panel 130 occupies a predetermined area on the upper surface of the cooktop 100.

[0177] Furthermore, since the heating coil WC cannot be placed in the area occupied by the cooktop control panel 130 on the upper surface of the cooktop 100, the heating coil WC should be placed in the remaining area besides the area occupied by the cooktop control panel 130. Therefore, the heating coil assembly 1000, including the heating coil WC, is arranged in the area on the upper surface of the cooktop 100 not occupied by the cooktop control panel 130. For example, the horizontal external shape of the heating coil assembly 1000 can be formed as a shape obtained by vertically flipping a "concave" shape.

[0178] The heating coil assembly 1000 may include coil modules 1001 and 1003, which include a heating coil WC, and may include various types of coil modules 1001 and 1003 with different lengths in a second direction. In this embodiment, the heating coil assembly 1000 is shown as including two types of coil modules 1001 and 1003, namely, a first coil module 1001 and a second coil module 1003.

[0179] For example, the horizontal external shape of each coil module in coil modules 1001 and 1003 (hereinafter referred to as the "external shape of the coil module") can be formed as a rectangle. That is, the external shapes of both the first coil module 1001 and the second coil module 1003 can be formed as rectangles.

[0180] For example, the second coil module 1003 can be formed as a rectangle having a different length in the second direction than the first coil module 1001. Furthermore, the second coil module 1003 and the cooktop control panel 130 are arranged in the same straight line in the second direction, and the second coil module 1003 can be arranged on the rear side of the cooktop control panel 130.

[0181] Considering that the second coil module 1003 is arranged in the same straight line as the stove control panel 130 in the second direction, the length of the second coil module 1003 in the second direction is set to be shorter than the length of the first coil module 1001 in the second direction.

[0182] As described above, the heating coil assembly 1000 is formed by a combination of multiple coil modules 1001 and 1003 arranged in a horizontal direction, and each coil module among the coil modules 1001 and 1003 can be formed as a rectangle. That is, the heating coil assembly 1000 is not formed by a single coil module having a shape obtained by vertically flipping a "concave" shape, but can be formed by a combination of multiple coil modules 1001 and 1003, each coil module 1001 and 1003 being formed as a rectangle.

[0183] According to this embodiment, as shown in Figures 8 and 9, the first coil plate portion 1100 forming the corresponding coil modules 1001 and 1003 can be formed by a copper clad laminate (CCL), and each copper clad laminate forming each first coil plate portion 1100 can be provided as a result obtained by cutting the original board B (hereinafter referred to as the "original board") of the copper clad laminate.

[0184] When the first coil plate portion 1100 is formed in a concave shape or a shape obtained by reversing a concave shape, during the process of manufacturing the first coil plate portion 1100 by cutting the original plate P, loss of the original plate P corresponding to the portion cut out to ensure the arrangement space for the cooktop control panel 130 inevitably occurs. That is, when the heating coil assembly 1000 is formed from a single coil module 1001 or 1003, the problem of increased loss of the original plate P used to manufacture the first coil plate portion 1100 arises.

[0185] In contrast, when the heating coil assembly 1000 is formed by combining multiple coil modules 1001 and 1003, each coil module among the coil modules 1001 and 1003 can be formed into a rectangle. That is, by combining various types of coil modules 1001 and 1003 with different sizes (e.g., first coil module 1001 and second coil module 1003), the heating coil assembly 1000 can be formed into a "concave" shape or a shape obtained by vertically flipping a "concave" shape.

[0186] Therefore, when the original plate P is cut to manufacture the first coil plate portion 1100, the original plate P can be cut into a rectangular shape, thereby effectively reducing the loss of the original plate P used to manufacture the first coil plate portion 1100.

[0187] According to this embodiment, the heating coil WC can be formed into a polygonal shape. For example, the horizontal outer shape of the heating coil WC (hereinafter referred to as the "outer shape of the heating coil") can be a polygonal shape.

[0188] As an example, the external shape of the heating coil WC can be approximately rectangular, and the horizontal external shape of the cooktop 100 (hereinafter referred to as the "external shape of the cooktop") can also be approximately rectangular. Considering the above, the horizontal external shapes of the coil modules 1001 and 1003 (hereinafter referred to as the "external shape of the coil modules") are preferably rectangular.

[0189] Since the outer shapes of coil modules 1001 and 1003 are rectangular, similar to the outer shape of heating coil WC, the density of the area occupied by heating coil WC within coil modules 1001 and 1003 can be effectively increased. Furthermore, since the outer shapes of coil modules 1001 and 1003 are rectangular, similar to the outer shape of stovetop 100, the density of the area occupied by coil modules 1001 and 1003 within stovetop 100 can be effectively increased.

[0190] That is, since the external shapes of the coil modules 1001 and 1003 are formed into polygonal shapes similar to the external shapes of the heating coil WC and the stove 100, the density of the area occupied by the heating coil WC within the stove 100 can be effectively increased, and thus the size of the area within the stove 100 where the cooking target can be heated can be effectively increased.

[0191] Therefore, when the size of the area in which the heated object contacts the heating coil WC inside the stove 100 is increased, the heating efficiency of the stove 100 can be effectively improved.

[0192] Furthermore, the length difference in the second direction between the first coil module 1001 and the second coil module 1003 can be adjusted by the difference in the number of heating coils WC in the second direction. For example, heating coils WC with the same size and shape can be provided in the first coil module 1001 and the second coil module 1003, and the number of heating coils WC in the second direction in the second coil module 1003 can be set to be at least one less than the number of heating coils WC in the second direction in the first coil module 1001.

[0193] As described above, by adjusting the number of heating coils WC, the lengths of the first coil module 1001 and the second coil module 1003 are set differently. Even when the sizes of the coil modules 1001 and 1003 are different, it is not necessary to design the size and shape of the heating coils WC differently according to the size of the coil modules. That is, various types of coil modules 1001 and 1003 with different lengths in the second direction can be provided in the form of including one type of heating coil WC.

[0194] Therefore, not only can the cost and time required to design heating coils WC be reduced, but also various types of coil modules 1001 and 1003 with different lengths in the second direction can be manufactured more easily and faster at a lower cost.

[0195] According to this embodiment, the stove control panel 130 and the second coil module 1003 can be arranged at the center of the upper surface of the stove 100 in the first direction, and the first coil module 1001 can be arranged on both sides of the upper surface of the stove 100 in the first direction.

[0196] For example, the length of the first coil module 1001 in the second direction can be set to be substantially similar to the length of the upper surface of the stove 100 in the second direction. Furthermore, the length difference in the second direction between the first coil module 1001 and the second coil module 1003 can be set to be greater than or equal to the length of the heating coil WC in the second direction.

[0197] Therefore, although the heating coil WC can fill most of the upper surface of the cooktop 100, the area required for arranging the cooktop control panel 130 can be fixed on the upper surface of the cooktop 100.

[0198] For example, in a heating coil assembly 1000, a pair of first coil modules 1001 and a second coil module 1003 may be arranged along a first direction. In this case, the pair of first coil modules 1001 may be arranged to be spaced apart along the first direction. Furthermore, a second coil module 1003 may be arranged between the pair of first coil modules 1001.

[0199] For example, a second coil module 1003 can be arranged at the center of the heating coil assembly 1000 in the first direction, similar to the cooktop control panel 130. The second coil module 1003 and the cooktop control panel 130 can be arranged in the same straight line in the second direction.

[0200] In this case, the number of heating coils WC included in each of the first coil modules 1001 and the number of heating coils WC included in the second coil module 1003 can be, for example, 8 and 6 respectively (see Figure 8), or 6 and 4 respectively (see Figure 11).

[0201] As another example, in the heating coil assembly 1000a shown in FIG. 10, two pairs of first coil modules 1001a and a pair of second coil modules 1003a can be arranged along a first direction. In this case, a pair of first coil modules 1001a can be arranged on one side of the pair of second coil modules 1003a in the first direction, and another pair of first coil modules 1001a can be arranged on the other side of the pair of second coil modules 1003a in the first direction.

[0202] In this case, the number of heating coils WC included in each of the first coil modules 1001a and the number of heating coils WC included in each of the second coil modules 1003a can be, for example, four and three respectively (see Figure 10), or three and two respectively (see Figure 12).

[0203] As another example, in the heating coil assembly 1000d shown in FIG. 13, a pair of first coil modules 1001d and a pair of second coil modules 1003d can be arranged to be spaced apart along a first direction. Furthermore, the pair of second coil modules 1003d can be arranged between the pair of first coil modules 1001d.

[0204] As another example, in the heating coil assembly 1000e shown in FIG. 14, two pairs of first coil modules 1001e and two pairs of second coil modules 1003e can be arranged along a first direction. In this case, one pair of first coil modules 1001e can be arranged on one side of the two pairs of second coil modules 1003e in the first direction, and the other pair of first coil modules 1001e can be arranged on the other side of the two pairs of second coil modules 1003e in the first direction.

[0205] Furthermore, as shown in Figure 15, only one pair of first coil modules 1001f can be arranged along the first direction, or as shown in Figure 16, only two pairs of first coil modules 1001g can be arranged along the first direction.

[0206] [Structure of the heating coil]

[0207] FIG17 is a plan view showing an example of a first coil plate portion according to an embodiment of the present disclosure; FIG18 is an enlarged view showing a portion of the first coil plate portion shown in FIG17; and FIG19 is a cross-sectional view schematically showing the stacked structure of the first coil portion shown in FIG18. FIG20 is a plan view showing an example of an arrangement structure of sensing coils; and FIG21 is an enlarged view of a portion of FIG20 showing an example of an arrangement structure of sensing coils relative to heating coils. FIG22 is an enlarged view of the first terminal shown in FIG18; and FIG23 is an enlarged view of the second terminal shown in FIG18.

[0208] According to this embodiment, as shown in Figures 8 and 17 to 19, the heating coil WC can be formed of conductors stacked in multiple layers, more specifically, of electrical conductors. In this embodiment, the conductors are shown as being formed of a first coil portion 1120, more specifically, of a coil pattern Cp, which will be described later.

[0209] The heating coil WC can be formed by vertically connecting the first coil portions 1120, which are respectively disposed in a plurality of first coil plates 1100 stacked in the vertical direction, to each other. Each first coil plate 1100 may include a core 1110 and a first coil portion 1120.

[0210] The core 1110 forms the frame of the first coil plate portion 1100 and can be formed of an insulating material. For example, the core 1110 can be formed of a prepreg material. In this embodiment, the core 1110 is exemplified as being formed of a thermosetting prepreg, more specifically, FR4 prepreg.

[0211] The first coil portion 1120 can be disposed on both sides of the core 1110 in the vertical direction. For example, each first coil plate portion 1100 can be provided in such a form that a layer of the first coil portion 1120 is formed on each of the two sides of the core 1110 in the vertical direction.

[0212] As an example, the first coil portion 1120 may be provided in a patterned form on each of the two sides of the core 1110 in the vertical direction. For example, the first coil plate portion 1100 may be formed from a copper-clad laminate including the core 1110 and copper foil stacked on each of the two sides of the core 1110 in the vertical direction. In this case, the first coil portion 1120 may be formed as a result of the foil stacked on the core 1110 being patterned into a coil shape.

[0213] According to this embodiment, the heating coil WC can be formed into a polygonal shape. For example, the horizontal outer shape of the heating coil WC (hereinafter referred to as the "outer shape of the heating coil") can be a polygonal shape.

[0214] Additionally, as described above, the heating coil WC can be formed from a plurality of first coil plates 1100 stacked in the vertical direction. The first coil plates 1100 may include patterned regions 1101 and unpatterned regions 1103 and 1105.

[0215] The patterned area 1101 corresponds to the area of ​​the first coil plate 1100 in which the first coil portion 1120 is disposed. The unpatterned areas 1103 and 1105 correspond to the areas of the first coil plate 1100 in which the first coil portion 1120 is not disposed. The patterned area 1101 and the unpatterned areas 1103 and 1105 can be disposed on the same plane and can be arranged in a horizontal direction.

[0216] The unpatterned regions 1103 and 1105 may include a first unpatterned region 1103. In each heating coil WC, the first unpatterned region 1103 may be located at the horizontal center. Alternatively, the first unpatterned region 1103 may be located at the horizontal center of the first coil plate portion 1100.

[0217] For example, the first unpatterned region 1103 can be located at the horizontal center of each heating coil WC and the first coil plate portion 1100. The patterned region 1101 can be arranged to surround the first unpatterned region 1103 from the horizontal outside.

[0218] In this embodiment, the term "center" does not mean the exact center, but refers to the area surrounded by the spirally wound heating coil WC, and includes the center of the heating coil WC in the diametrical direction and the area around it.

[0219] At least a portion of the first coil portion 1120 may be horizontally outer to surround the unpatterned regions 1103 and 1105. For example, at least a portion of the first coil portion 1120 may be horizontally outer to surround the first unpatterned region 1103.

[0220] The first coil portion 1120 may include at least one coil pattern Cp disposed horizontally outside the first unpatterned region 1103. In each first coil portion 1120, each coil pattern Cp may be wound multiple turns around the first unpatterned region 1103. The first coil portion 1120 may be formed from at least one coil pattern Cp provided in this manner.

[0221] Each first coil portion 1120 may include a plurality of coil patterns Cp. In this case, in each first coil portion 1120, the plurality of coil patterns Cp may be arranged to be spaced apart from each other at predetermined intervals along the diametrical direction of the heating coil WC.

[0222] For example, each first coil portion 1120 may include three to six coil patterns Cp. However, this disclosure is not limited thereto, and each coil portion 112 may include more than six coil patterns Cp.

[0223] In this embodiment, each first coil portion 1120 is shown as comprising three to six coil patterns Cp. Therefore, in each first coil portion 1120, three to six coil patterns Cp can be arranged along the diametrical direction of the heating coil WC. Each coil pattern Cp arranged in each first coil portion 1120 can be vertically connected to one of the coil patterns Cp arranged in another adjacent first coil portion 1120 in the vertical direction.

[0224] Furthermore, the first coil plate portion 1100 may also include a second unpatterned region 1105. Similar to the first unpatterned region 1103, the second unpatterned region 1105 corresponds to the region in which the first coil portion 1120 is not formed.

[0225] Regarding the horizontal direction, the second unpatterned region 1105 may be disposed outside the first unpatterned region 1103. In this embodiment, the second unpatterned region 1105 is shown as disposed outside the first unpatterned region 1103 in a first direction.

[0226] Furthermore, in each of the first coil plate portions 1100, the first unpatterned region 1103 and the second unpatterned region 1105 are not connected in the horizontal direction. Regarding the horizontal direction, at least a portion of the sensing coil SC can be arranged between the first unpatterned region 1103 and the second unpatterned region 1105. That is, at least a portion of the first coil portion 1120 can be arranged between the first unpatterned region 1103 and the second unpatterned region 1105.

[0227] According to this embodiment, for each heating coil WC, a plurality of second unpatterned regions 1105 can be arranged along a first direction. For example, for each heating coil WC, a pair of second unpatterned regions 1105 can be arranged. The pair of second unpatterned regions 1105 can be arranged outside the first unpatterned region 1103 in the first direction. That is, with respect to the first direction, the first unpatterned region 1103 can be arranged between the pair of second unpatterned regions 1105.

[0228] Furthermore, according to this embodiment, a plurality of heating coils WC can be arranged along a first direction. A plurality of second unpatterned regions 1105 disposed in the plurality of heating coils WC arranged in this manner can be arranged at equal intervals along the first direction.

[0229] Furthermore, as shown in Figures 6 and 7, the second coil plate portion 1200 is disposed above or below the first coil plate portion 1100, and the sensing coil SC can be formed from the second coil plate portion 1200. The sensing coil SC can be arranged above or below the first coil plate portion 1100, and can be arranged in the region that overlaps with the first coil plate portion 1100 in the vertical direction.

[0230] In each of the coil modules 1001 and 1003, as shown in Figures 6 to 7 and Figures 20 to 21, the sensing coil SC can be disposed on the outer side of the heating coil WC in the vertical direction. For example, in each of the coil modules 1001 and 1003, the sensing coil SC and the heating coil WC can be arranged in the vertical direction.

[0231] Regarding the horizontal direction, at least a portion of the sensing coil SC can be arranged in the second unpatterned region 1105. Therefore, since the plurality of second unpatterned regions 1105 are arranged at equal intervals along the first direction, the plurality of sensing coils SC can be arranged at equal intervals along the first direction.

[0232] As described above, since the plurality of second unpatterned regions 1105 are arranged at equal intervals along the first direction, the plurality of sensing coils SC can be arranged at equal intervals along the first direction. According to this embodiment, at least a portion of each sensing coil SC can be arranged in the second unpatterned regions 1105. Therefore, when the plurality of second unpatterned regions 1105 are arranged at equal intervals along the first direction, the plurality of sensing coils SC can be arranged at equal intervals along the first direction.

[0233] According to this embodiment, the temperature sensor TS can be arranged inside the sensing coil SC in the horizontal direction. Regarding the horizontal direction, at least a portion of the temperature sensor TS can be disposed in the second unpatterned region 1105.

[0234] For example, a temperature sensor TS can be disposed in the second unpatterned area 1105. That is, the temperature sensor TS mounted on the second coil plate portion 1200 and the second unpatterned area 1105 formed on the first coil plate portion 1100 can be arranged to overlap each other in the vertical direction.

[0235] For this purpose, each sensing coil SC can be arranged at a position in which the entire temperature sensor TS can be arranged in the second unpatterned area 1105, that is, at a position where the entire temperature sensor TS can overlap with the second unpatterned area 1105 in the vertical direction.

[0236] Additionally, as shown in Figures 17-18 and 22-23, each first coil portion 1120 may include a first terminal 1121 and a second terminal 1122. The first terminal 1121 and the second terminal 1122 are configured to connect a plurality of coil patterns Cp arranged in a horizontal direction, that is, to form a plurality of coil patterns Cp forming a first coil portion 1120.

[0237] Regarding the horizontal direction, the first terminal 1121 may be arranged outside the first unpatterned area 1103 and the second terminal 1122, and at least a portion of the second terminal 1122 may be arranged to contact the first unpatterned area 1103. Therefore, regarding the horizontal direction, the second unpatterned area 1105 may be disposed between the first terminal 1121 and the second terminal 1122.

[0238] Alternatively, relative to the second unpatterned region 1105, the first terminal 1121 may be arranged on the horizontal outer side of the first coil portion 1120, and the second terminal 1122 may be arranged on the horizontal inner side of the first coil portion 1120.

[0239] For example, the first terminal 1121 may be arranged on the outermost side of the first coil portion 1120 in the horizontal direction, and the second terminal 1122 may be arranged on the innermost side of the first coil portion 1120 in the horizontal direction. For example, the first terminal 1121 may be connected to the outermost end of the coil pattern Cp in the horizontal direction. In addition, the second terminal 1122 may be connected to the innermost end of the coil pattern Cp in the horizontal direction.

[0240] Referring to Figures 6 and 20, the heating coil assembly 1000 according to this embodiment may further include a connector 1020. The connector 1020 is provided to be connectable to at least one of the first terminal 1121 and the second terminal 1122. A detailed description of the connector 1020 will be described later.

[0241] [Arrangement structure of heating coils for each coil module]

[0242] As shown in Figure 8, each coil module in coil modules 1001 and 1003 may include multiple heating coils WC arranged in a horizontal direction. For example, each coil module in coil modules 1001 and 1003 may include multiple heating coils WC arranged in a first direction and also in a second direction. That is, each coil module in coil modules 1001 and 1003 may include multiple heating coils WC arranged in a matrix.

[0243] In this case, each heating coil WC can be set to be spaced apart from another adjacent heating coil WC by a predetermined distance in a first direction, and spaced apart from another adjacent heating coil WC by a predetermined distance in a second direction.

[0244] According to this embodiment, the length of each coil module in coil modules 1001 and 1003 in the first direction can be set to be shorter than the length of coil modules 1001 and 1003 in the second direction. That is, each coil module in coil modules 1001 and 1003 can be formed into a rectangular shape, wherein the length in the second direction is longer than the length in the first direction.

[0245] In contrast, the length of each heating coil WC in the second direction can be set to be shorter than the length of the heating coil WC in the first direction. That is, each heating coil WC can be formed into a rectangular shape, wherein the length in the first direction is longer than the length in the second direction.

[0246] In each of the coil modules 1001 and 1003 that include such heating coils WC, the number of heating coils WC arranged along the same straight line in the second direction is greater than the number of heating coils WC arranged along the same straight line in the first direction.

[0247] According to this embodiment, the first coil module 1001 may include a plurality of heating coils WC arranged in a column A × row B configuration, and the second coil module 1003 may include a plurality of heating coils WC arranged in a column A × row C configuration. In this embodiment, a column is defined as a line in a first direction, and a row is defined as a line in a second direction.

[0248] For example, the relationship between A, B, and C can be defined as follows.

[0249] A≥1, C≥2 and B>C.

[0250] For example, in the first coil module 1001 and the second coil module 1003, one or more heating coils WC can be arranged in the first direction, and two or more heating coils WC can be arranged in the second direction. Furthermore, in the first coil module 1001, one or more heating coils WC can be arranged in the first direction, and three or more heating coils WC can be arranged in the second direction.

[0251] Therefore, the number of heating coils WC arranged in the same straight line in the first direction in the first coil module 1001 and the number of heating coils WC arranged in the same straight line in the first direction in the second coil module 1003 can be set to be the same as each other. Alternatively, the number of heating coils WC arranged in the same straight line in the second direction in the second coil module 1003 can be set to be less than the number of heating coils WC arranged in the same straight line in the second direction in the first coil module 1001.

[0252] For example, when n first coil modules 1001 are arranged to be spaced apart along a first direction, n / 2 second coil modules 1003 can be arranged between a pair of first coil modules 1001, which are arranged on the innermost side of the first direction.

[0253] In this configuration, each first coil module 1001 may include 16 / n heating coils WC, arranged in a 4 / n column × 4 row configuration. Furthermore, each second coil module 1003 may include 12 / n heating coils WC, arranged in a 4 / n column × 3 row configuration.

[0254] For example, when two first coil modules 1001 are arranged to be spaced apart along a first direction, a second coil module 1003 can be arranged between a pair of first coil modules 1001, which are arranged at the innermost part of the pair along the first direction. In this case, each of the first coil modules 1001 may include eight heating coils WC arranged in a 2-column × 4-row configuration.

[0255] Furthermore, each second coil module 1003 may include six heating coils WC arranged in a 2-column × 3-row configuration. In this case, the heating coil assembly 1000 may include a total of 22 heating coils WC.

[0256] As described above, the cooktop 100 (see Figure 3) is provided with multiple indicator lights L (see Figure 3), and the indicator lights L can be implemented by the lighting module 180 (see Figure 4). The lighting module 180 is arranged below the heating coil assembly 1000, and the light emitted from the lighting module 180 can pass through the heating coil assembly 1000 to illuminate the light display area of ​​the top plate 120.

[0257] To allow light emitted from the lighting module 180 to pass through the light display area of ​​the top plate 120, each coil module in coil modules 1001 and 1003 may be provided with a through hole h. In each coil module 1001 and 1003, the through hole h may penetrate the coil module 1001 or 1003 in the vertical direction, and each through hole h may be provided between a row of heating coils WC and an adjacent row of heating coils WC.

[0258] As shown in Figure 10, if four first coil modules 1001a are arranged spaced apart along a first direction, two second coil modules 1003a can be arranged between a pair of first coil modules 1001a, which are arranged at the innermost edge of the first direction. In this case, each first coil module in the first coil module 1001a may include four heating coils WC arranged in a 1-column × 4-row configuration.

[0259] When the heating coil assembly 1000a is provided in the manner described above, spaces can be formed between the individual columns of the heating coil assembly 1000a. Such spaces can be used as channels to allow light emitted from the illumination module 180 to pass through and reach the light display area of ​​the top plate 120.

[0260] Therefore, since each coil module in coil modules 1001a and 1003a is provided in the form of only one row of heating coils WC, it is not necessary to form a through hole separately in heating coil assembly 1000a.

[0261] Furthermore, considering that the size of the product and the size of the display or control panel can vary depending on the model, the heating coil assembly 1000a provided in the above form may be more advantageous for mass production than the heating coil assembly shown in Figure 8.

[0262] For example, according to the heating coil assembly 1000a provided in the above form, when producing multiple products with displays or control panels of different sizes, the size of only the second coil module 1003a can be changed according to the size of the display or control panel, while the first coil module 1001a can be used together.

[0263] Furthermore, the heating coil assembly 1000a provided in the above form facilitates maintenance and reduces maintenance costs because each coil module 1001a or 1003a can be repaired or replaced row by row when necessary.

[0264] Furthermore, when each coil module 1001a and 1003a is provided in the form of only one row of heating coils WC as described above, the surface area of ​​each coil module 1001a or 1003a can be relatively increased compared to the case where each coil module includes two rows of heating coils WC, and air can flow through the space between the coil modules 1001a and 1003a, thereby improving the heat dissipation performance of the heating coil assembly 1000a.

[0265] In contrast, as shown in Figure 8, when two or more rows of heating coils WC are arranged in each coil module of coil modules 1001 and 1003, the number of coil modules 1001 and 1003 to be assembled is reduced compared to the case where only one row of heating coils WC is arranged in each coil module, thus providing the advantage of reducing assembly labor.

[0266] Furthermore, when two or more rows of heating coils WC are arranged in each of the coil modules in coil modules 1001 and 1003, the space required to form wiring between two adjacent rows of heating coils WC can be easily fixed in coil modules 1001 and 1003, thus providing the advantage of easy and efficient wiring design.

[0267] Furthermore, each second coil module 1003a may include three heating coils WC arranged in a 1-column × 3-row configuration. In this case, the heating coil assembly 1000a may also include a total of 22 heating coils WC.

[0268] As a second example, as shown in Figure 11, each first coil module in the first coil module 1001b may include 12 / n heating coils WC arranged in a 4 / n column × 3 row configuration. Furthermore, each second coil module 1003b may include 8 / n heating coils WC arranged in a 4 / n column × 2 row configuration.

[0269] For example, when two first coil modules 1001b are arranged spaced apart along a first direction, a second coil module 1003b can be arranged between the pair of first coil modules 1001b, which are positioned at the innermost position along the first direction. In this case, each of the first coil modules 1001b may include six heating coils WC arranged in a 2-column × 3-row configuration.

[0270] Furthermore, each of the second coil modules in the second coil module 1003b may include four heating coils WC arranged in a 2-column × 2-row configuration. In this case, the heating coil assembly 1000b may include a total of 16 heating coils WC.

[0271] As shown in Figure 12, if four first coil modules 1001c are arranged to be spaced apart along a first direction, then two second coil modules 1003c can be arranged between a pair of first coil modules 1001c, which are arranged on the innermost side of the first direction.

[0272] In this configuration, each first coil module in the first coil module 1001c may include three heating coils WC arranged in a 1-column × 3-row configuration. Furthermore, each second coil module in the second coil module 1003c may include two heating coils WC arranged in a 1-column × 2-row configuration. In this configuration, the heating coil assembly 1000c may also include a total of 16 heating coils WC.

[0273] As a third example, as shown in Figure 13, when two first coil modules 1001d are arranged spaced apart along a first direction, two second coil modules 1003d can be arranged between a pair of first coil modules 1001d, which are arranged at the innermost edge of the first direction. In this case, each first coil module in the first coil module 1001d may include ten heating coils WC arranged in a 2-column × 5-row configuration.

[0274] Furthermore, each second coil module 1003d may include six heating coils WC arranged in a 2-column × 3-row configuration. In this case, the heating coil assembly 1000d may include a total of 32 heating coils WC.

[0275] As a fourth example, as shown in Figure 14, when four first coil modules 1001e are arranged spaced apart along a first direction, four second coil modules 1003e can be arranged between a pair of first coil modules 1001e, which are arranged at the innermost edge of the first direction. In this case, each of the first coil modules 1001e may include five heating coils WC arranged in a 1-column × 5-row configuration.

[0276] Furthermore, each of the second coil modules 1003e may include three heating coils WC arranged in a 1-column × 3-row configuration. In this case, the heating coil assembly 1000e may also include a total of 32 heating coils WC.

[0277] As a fifth example, as shown in Figure 15, when n first coil modules 1001f are arranged to be spaced apart along a first direction, each first coil module in the first coil module 1001f may include 16 / n heating coils WC arranged in a configuration of 4 / n columns × 4 rows.

[0278] For example, when two first coil modules 1001f are arranged to be spaced apart along a first direction, each first coil module 1001f may include eight heating coils WC arranged in a 2-column × 4-row configuration. In this case, the heating coil assembly 1000f may include a total of 16 heating coils WC.

[0279] As shown in Figure 16, if the four first coil modules 1001g are arranged to be spaced apart along a first direction, each of the first coil modules 1001g may include four heating coils WC arranged in a 1 column × 4 row configuration. In this case, the heating coil assembly 1000g may also include a total of 16 heating coils WC.

[0280] In the example above, the heating coil assembly may include all heating coils WC having the same size and shape. Alternatively, the heating coil assembly may include various types of heating coils WC having different sizes and shapes.

[0281] Figure 24 is a plan view showing a seventh example of the arrangement of the first coil module and the second coil module.

[0282] As another example, the heating coil assembly 1000h shown in FIG24 may further include at least one of a third coil module 1005 and a fourth coil module 1007. The first coil module 1001 and the third coil module 1005 are arranged in the same straight line in the second direction, and the second coil module 1003 and the fourth coil module 1007 may be arranged in the same straight line in the second direction.

[0283] Therefore, with respect to the first direction, a pair of first coil modules 1001 can be arranged to be spaced apart along the first direction, wherein the second coil module 1003 and the fourth coil module 1007 are located between the pair of first coil modules.

[0284] Furthermore, regarding the second direction, the first coil module 1001 may protrude further to one side than the second coil module 1003, the third coil module 1005 may be arranged at a position offset to one side more than the first coil module 1001, and the fourth coil module 1007 may be arranged at a position offset to one side more than the second coil module 1003.

[0285] That is, the first coil module 1001, whose length in the second direction is greater than that of the second coil module 1003, can protrude further forward than the second coil module 1003; the third coil module 1005 can be arranged at a position offset further forward than the first coil module 1001; and the fourth coil module 1007 can be arranged at a position offset further forward than the second coil module 1003. Of course, the third coil module 1005 is positioned at a position offset further forward than the fourth coil module 1007.

[0286] The third coil module 1005 and the fourth coil module 1007 can be configured to have a horizontal dimension smaller than that of the first coil module 1001 and the second coil module 1003. Therefore, the third coil module 1005 may include a heating coil with a horizontal dimension smaller than that of the heating coil disposed in the first coil module 1001.

[0287] As described above, the cooktop control panel 130 can be positioned further forward than the second coil module 1003, and a pair of first coil modules 1001 can be arranged spaced apart along a first direction, with the cooktop control panel 130 inserted between the pair of first coil modules 1001. Furthermore, a pair of third coil modules 1005 positioned in front of the pair of first coil modules 1001 can also be arranged spaced apart along the first direction, with the cooktop control panel 130 located between the pair of third coil modules 1005.

[0288] Regarding the first direction, the length of the third coil module 1005 can be set to be shorter than the length of the first coil module 1001. Furthermore, regarding the second direction, the length of the third coil module 1005 can also be set to be shorter than the length of the first coil module 1001. That is, the third coil module 1005 can be configured such that its length in both the first and second directions is shorter than the length of the first coil module 1001.

[0289] Furthermore, the fourth coil module 1007 can be arranged behind the cooktop control panel 130. In the second direction, the fourth coil module 1007 can be arranged between the cooktop control panel 130 and the second coil module 1003, and the length of the fourth coil module 1007 can be shorter than the length of the second coil module 1003.

[0290] When the third coil module 1005 and the fourth coil module 1007 are arranged as described above, it can be ensured that the area where the cooktop control panel 130 is located is relatively wide. Therefore, the cooktop control panel 130 can be further spaced apart from the coil modules 1001 and 1003 in the horizontal direction, so that the cooktop control panel 130 is less affected by the heat generated around the heating coil WC.

[0291] [Power Supply Related Structure]

[0292] Figure 25 is a schematic diagram illustrating the construction of a power-related configuration of a cooking appliance according to an embodiment of the present disclosure, and Figure 26 is a diagram illustrating an example of the drive circuit and load circuit shown in Figure 25.

[0293] Referring to Figures 2, 25 and 26, the cooking appliance according to this embodiment may include a cooktop control panel 130, a load circuit 350 and a drive circuit 300.

[0294] According to this embodiment, the cooktop control panel 130 may be equipped with a user interface and a display. The user interface includes various icons for adjusting the operation of the cooktop 100 via touch, and the display is used to indicate the operating status of the cooktop 100. The user can input the target heating intensity through the cooktop control panel 130.

[0295] The load circuit 350 may include at least one heating coil, at least one capacitor, and at least one relay. Here, the at least one heating coil, the at least one capacitor, and the at least one relay may be selectively connected in series or in parallel.

[0296] The drive circuit 300 can provide drive current to the load circuit 350 by switching the drive of the inverter circuit. The drive circuit 300 may include a current converter 330 and a resonant voltage generator 340.

[0297] The current converter 330 can generate a resonant current Ir obtained by converting the current based on the drive current, and the resonant voltage generator 340 generates a resonant voltage Vr based on the current converter 330 and the AC voltage. Depending on the design, the current converter 330 and the resonant voltage generator 340 can be provided within the drive circuit 300.

[0298] Furthermore, the cooking appliance according to this embodiment may also include a current measuring circuit 400. The current measuring circuit 400 can measure the input current applied to the load circuit 350 by using the resonant current Ir and the resonant voltage Vr, and measure the average input current by averaging the input current.

[0299] Furthermore, the cooking appliance according to this embodiment may also include a sensing coil SC and a controller 500.

[0300] The sensing coil SC can detect the presence of a heated object and, when detected, provides a container detection signal to the controller 500. The sensing coil SC can store oscillating energy or, under the control of the controller 500, output a free-resonant oscillating signal. The sensing coil SC can filter the DC component from the oscillating signal, compare the filtered oscillating signal with a reference signal, and output the container detection signal to the controller 500 based on the comparison result.

[0301] The controller 500 can control the drive circuit 300 to drive the load circuit 350 with a target intensity received from the cooktop control panel 130. The controller 500 can control the switching of the switching elements of the drive circuit 300.

[0302] The controller 500 can measure the power of the load circuit 350 based on the average input current received from the current measurement circuit 400, and determine the switching frequency to maintain the target heating intensity according to the power of the load circuit 350. The controller 500 can control the switching drive of the inverter circuit of the drive circuit 300 based on the switching frequency.

[0303] The controller 500 can determine container information based on a container detection signal received from the sensing coil SC, the container information including at least one of the container's position, material, shape, and size. The controller 500 can control at least one relay in the load circuit 350 to activate at least one heating coil corresponding to the container's position.

[0304] In addition, the controller 500 can determine or change the switching frequency of the switch drive for controlling the inverter circuit of the drive circuit 300 based on at least one of the material, shape and size of the container.

[0305] Referring to FIG25, the drive circuit according to an embodiment of the present disclosure may include a rectifier circuit 310 and inverter circuits 320a and 320b.

[0306] Inverter circuits 320a and 320b may include a first inverter circuit 320a and a second inverter circuit 320b. The first inverter circuit 320a may provide a first drive current to the load circuit 350 according to a switching drive, and the second inverter circuit 320b may provide a second drive current to the load circuit 350 together with the first inverter circuit 320a according to a switching drive.

[0307] The load circuit 350 may include at least one capacitor CS1, CS2, CS3, CS4, CS5, CS6, CS7 and CS8 connected in series or in parallel, at least one heating coil WC1, WC2, WC3, WC4, WC5, WC6, WC7 and WC8, and at least one relay RL1, RL2, RL3, RL4, RL5 and RL6.

[0308] In addition, capacitors CS1, CS2, CS3, CS4, CS5, CS6, CS7, and CS8 can be used to filter out the DC component from the drive current. Heating coils WC1, WC2, WC3, WC4, WC5, WC6, WC7, and WC8 can be used to heat the cooking container using electromagnetic induction.

[0309] Relays RL1, RL2, RL3, RL4, RL5, and RL6 can be used to selectively connect heating coils WC1, WC2, WC3, WC4, WC5, WC6, WC7, and WC8 in series or parallel. Heating coils WC1, WC2, WC3, WC4, WC5, WC6, WC7, and WC8, along with capacitors CS1, CS2, CS3, CS4, CS5, CS6, CS7, and CS8, can be used to determine the resonant frequency of the drive current.

[0310] The load circuit 350 may include a first capacitor CS1, a first heating coil WC1, a second heating coil WC2, a second capacitor CS2, and a first relay RL1. The first capacitor CS1 can transmit a first drive current supplied from the first inverter circuit 320a. The first heating coil WC1 can be connected in series with the first capacitor CS1, and the second heating coil WC2 can be connected in series with the first heating coil WC1. The second capacitor CS2 can be connected in series with the second heating coil WC2, and the first relay RL1 can switch between the second capacitor CS2 and a ground voltage terminal.

[0311] In addition, the load circuit 350 may also include a third capacitor CS3, a third heating coil WC3, a fourth heating coil WC4, a fourth capacitor CS4, and a second relay RL2.

[0312] The third capacitor CS3 can transmit the second drive current provided by the second inverter circuit 320b. The third heating coil WC3 can be connected in series with the third capacitor CS3, and the fourth heating coil WC4 can be connected in series with the third heating coil WC3. The fourth capacitor CS4 can be connected in series with the fourth heating coil WC4, and the second relay RL2 can switch between the fourth capacitor CS4 and the ground voltage terminal.

[0313] In addition, the load circuit 350 may also include a third relay RL3. The third relay RL3 can switch between the node between the first heating coil WC1 and the second heating coil WC2 and the node between the third heating coil WC3 and the fourth heating coil WC4.

[0314] In addition, the load circuit 350 may also include a fifth capacitor CS5, a fifth heating coil WC5, a sixth heating coil WC6, a sixth capacitor CS6, and a fourth relay RL4.

[0315] The fifth capacitor CS5 can transmit the first drive current provided by the first inverter circuit 320a. The fifth heating coil WC5 can be connected in series with the fifth heating coil WC5, and the sixth heating coil WC6 can be connected in series with the fifth heating coil WC5. The sixth capacitor CS6 can be connected in series with the sixth heating coil WC6, and the fourth relay RL4 can switch between the sixth capacitor CS6 and the ground voltage terminal.

[0316] In addition, the load circuit 350 may also include a seventh capacitor CS7, a seventh heating coil WC7, an eighth heating coil WC8, an eighth capacitor CS8, and a fifth relay RL5.

[0317] The seventh capacitor CS7 can transmit the second drive current provided from the second inverter circuit 320b. The seventh heating coil WC7 can be connected in series with the seventh capacitor CS7, and the eighth heating coil WC8 can be connected in series with the seventh heating coil WC7. The eighth capacitor CS8 can be connected in series with the eighth heating coil WC8, and the fifth relay RL5 can switch between the eighth capacitor CS8 and the ground voltage terminal.

[0318] In addition, the load circuit 350 may also include a sixth relay RL6. The sixth relay RL6 can switch between the node between the fifth heating coil WC5 and the sixth heating coil WC6 and the node between the seventh heating coil WC7 and the eighth heating coil WC8.

[0319] [Stacking structure of coil board stacks]

[0320] Referring to Figures 7 and 8, each coil module in coil modules 1001 and 1003 can be formed by a coil plate stack 1010. The coil plate stack 1010 may include a plurality of first coil plate portions 1100 and at least one second coil plate portion 1200 stacked in the vertical direction.

[0321] As shown in Figures 8 and 19, the first coil plate portion 1100 can be formed in a structure where the core 1110 and the first coil portion 1120 are stacked vertically. The second coil plate portion 1200 can be formed in a structure where the core 1210 and the second coil portion 1220 are stacked vertically. The core 1210 forms the frame of the second coil plate portion 1200 and can be formed of the same or similar material as the core 1110 of the first coil plate portion 1100.

[0322] For example, in the first coil plate portion 1100, the first coil portion 1120 may be arranged on both sides of the core 1110 in the vertical direction. For example, the first coil portion 1120 may be stacked on the upper and lower surfaces of the core 1110 respectively.

[0323] In the second coil plate portion 1200, the first coil portion 1120 can be arranged on one side of the core 1210 in the vertical direction, that is, below the core 1210, and the second coil portion 1220 can be arranged on the other side of the core 1210 in the vertical direction, that is, above the core 1210. For example, the first coil portion 1120 can be stacked on the lower surface of the core 1210, and the second coil portion 1220 can be stacked on the upper surface of the core 1210.

[0324] As another example, in the second coil plate portion 1200, the second coil portion 1220 may be arranged on both sides of the core 1210 in the vertical direction.

[0325] In this embodiment, the second coil plate portion 1200 is shown to include a first coil portion 1120 and a second coil portion 1220, wherein the first coil portion 1120 is arranged below the core 1210 and the second coil portion 1220 is arranged above the core 1210.

[0326] According to this embodiment, the heating coil WC, more specifically, the coil plate stack 1010 may include six or more layers of first coil portions 1120. That is, the coil plate stack 1010 may include six or more first coil portions 1120, which are connected in the vertical direction and integrally connected to each other.

[0327] To ensure a sufficient amount of induced current for heating the object via the heating coil WC, the amount of conductor included in the heating coil WC needs to be adequately ensured. There are limitations on increasing the height of the coil pattern Cp to increase the number of conductors included in the heating coil WC.

[0328] With this in mind, increasing the number of coil patterns Cp in each layer forming the heating coil WC, and increasing the number of layers of coil patterns Cp forming the heating coil WC, can be an effective method for increasing the number of conductors included in the heating coil WC.

[0329] According to this embodiment, three or more coil patterns Cp connected in parallel for each layer can be arranged along the diameter direction of the heating coil WC to form a coil line. Furthermore, three or more coil lines formed in this way can be stacked to overlap each other in the vertical direction to form the heating coil WC.

[0330] Considering the winding spacing of the coil pattern Cp and other design conditions, there are limitations to increasing the number of coil patterns Cp in each layer. For example, when the number of coil patterns Cp in each layer increases, the size of the individual heating coils WC increases, which may lead to a need to reduce the number of heating coils WC installed in the cooking appliance.

[0331] Furthermore, when the width of the coil pattern Cp is reduced in order to increase the number of coil patterns Cp in each layer, the space required to ensure the spacing between the coil patterns Cp increases. Therefore, the following problem may occur: although the number of coil patterns Cp is increased, the number of conductors included in the heating coil WC is reduced instead.

[0332] Conversely, increasing the number of layers in the coil pattern Cp can be considered a relatively less problematic approach. That is, as the number of layers in the coil pattern Cp increases, the number of conductors included in the heating coil WC also increases, and the likelihood of a decrease in the number of heating coil WC or the number of conductors included in the heating coil WC is very low, even when the number of layers in the coil pattern Cp increases.

[0333] With this in mind, in this embodiment, since three or more coil patterns Cp are arranged for each layer, three layers of coil patterns Cp can also be arranged in the vertical direction to form three layers of coil lines. Furthermore, considering that since such three layers of coil lines (e.g., the first coil line) are arranged, it is necessary to arrange three layers of coil lines with a pattern different from that of the coil lines (e.g., the second coil line), it is preferable that the coil plate stack 1010 includes six or more layers of coil lines.

[0334] Furthermore, depending on the design conditions, the amount of conductor included in the heating coil WC can be increased more effectively by stacking the coil wires into eight or more layers. In this embodiment, a first coil portion 1120 with eight to twelve layers stacked in the vertical direction is shown. However, this disclosure is not limited to this, and the first coil portion 1120 may also be stacked with more than twelve layers.

[0335] For example, as the number of layers in the first coil portion 1120 increases, coil modules 1001 and 1003 can be designed such that the thickness of each layer in the first coil portion 1120 decreases, and thus, despite the increase in the number of layers in the first coil portion 1120, the increase in the total thickness of coil modules 1001 and 1003 can be suppressed to an appropriate level.

[0336] Furthermore, the coil plate stack 1010 may include at least one layer of second coil portion 1220. For example, the coil plate stack 1010 may include 8 to 12 layers of first coil portions 1120 and 1 to 2 layers of second coil portions 1220 that are connected and integrally joined in the vertical direction.

[0337] Furthermore, the coil plate stack 1010 may also include an insulating layer stacked vertically together with the first coil portion 1120. In each coil plate stack 1010, the coil portions 1120 and 1220 and the insulating layer may be arranged alternately in the vertical direction.

[0338] In the first coil plate portion 1100, the insulating layer may be formed from the core 1110. Furthermore, in the second coil plate portion 1200, the insulating layer may be formed from the core 1210.

[0339] Furthermore, an insulating layer may also be provided between the coil plate portions 1100 and 1200. For example, the insulating layer may be provided between a pair of first coil plate portions 1100 that are adjacent to each other in the vertical direction, and the insulating layer may also be provided between the first coil plate portion 1100 and the second coil plate portion 1200. In addition, the insulating layer may also be provided between a pair of second coil plate portions 1200 that are adjacent to each other in the vertical direction.

[0340] As an example, the insulating layer disposed between the coil plate portions 1100 and 1200 as described above can be formed of adhesive material 1400. According to this embodiment, a plurality of first coil plate portions 1100 stacked in the vertical direction can be connected to each other by adhesive material 1400, and the first coil plate portions 1100 and second coil plate portions 1200 can also be connected to each other by adhesive material 1400. Furthermore, a plurality of second coil plate portions 1200 stacked in the vertical direction can also be connected to each other by adhesive material 1400.

[0341] Therefore, the insulating layer can be formed by cores 1110 and 1210 respectively disposed in the first coil plate portion and the second coil plate portion 1100 and 1200 (hereinafter referred to as "coil plate portion"), and the insulating layer can also be formed by adhesive material 1400 disposed between the coil plate portion 1100 and 1200.

[0342] Cores 1110 and 1210 can be disposed between a pair of first coil portions 1120 facing each other in the vertical direction, between a pair of second coil portions 1220 facing each other in the vertical direction, or between the first coil portion 1120 and the second coil portion 1220, thereby forming an insulating layer therebetween. That is, cores 1110 and 1210 can form an insulating layer within the first coil plate portion 1100 or within the second coil plate portion 1200.

[0343] Furthermore, the adhesive material 1400 can be disposed between a pair of first coil portions 1120 facing each other in the vertical direction, between a pair of second coil portions 1220 facing each other in the vertical direction, or between the first coil portions 1120 and the second coil portions 1220 facing each other in the vertical direction, thereby forming an insulating layer therebetween. That is, the adhesive material 1400 can form an insulating layer on the outer side of the first coil plate portion 1100 or the second coil plate portion 1200.

[0344] Therefore, either the first coil portion and the second coil portions 1120 and 1220 (hereinafter referred to as "coil portions") and the insulating layer can be arranged alternately in the vertical direction. That is, the first coil portion 1120 and the insulating layer can also be arranged alternately in the vertical direction, and the second coil portion 1220 and the insulating layer can also be arranged alternately.

[0345] Furthermore, among the multiple insulating layers arranged vertically, the cores 1110 and 1210, as well as the adhesive material 1400, can be arranged alternately in the vertical direction. For example, the coil portions 1120 and 1220, and the insulating layers, can be arranged in a " First coil section 1120 - Core 1110 - First coil section 1120 - Adhesive material 1400 - First coil section 1120 The characters are stacked vertically in the order of "".

[0346] In this embodiment, coil plate portions 1100 and 1200 are shown as being formed of copper-clad laminates including cores 1110 and 1210 and foil, respectively. Therefore, cores 1110 and 1210 can be formed of thermosetting prepreg.

[0347] For example, cores 1110 and 1210 can be formed from FR4 prepreg, and coil portions 1120 and 1220 can be formed as a result of foils disposed on cores 1110 and 1210 being patterned into coil shapes. The thickness of the first coil plate portion 1100 or the second coil plate portion 1200 can be adjusted by changing the thickness of core 1110 or by changing the thickness of the first coil portion 1120 or the second coil portion 1220.

[0348] Furthermore, the adhesive material 1400 can be formed of a prepreg material. For example, each adhesive material 1400 may include multiple prepreg films stacked in the vertical direction. The thickness of the adhesive material 1400 can be adjusted by changing the number of prepreg films stacked in the vertical direction.

[0349] The thickness of the adhesive material 1400 can be set to be greater than the thickness of the cores 1110 and 1210. According to this embodiment, both the cores 1110 and 1210 and the adhesive material 1400 are formed from prepreg, but the cores 1110 and 1210 are formed from thermosetting prepreg, while the adhesive material 1400 is formed from a non-thermosetting prepreg. Considering the above, in this embodiment, the adhesive material 1400 is formed to be thicker than the cores 1110 and 1210, such that the strength of the adhesive material 1400 is maintained at a level similar to that of the cores 1110 and 1210, and the strength of the coil modules 1001 and 1003 can be enhanced.

[0350] Furthermore, the thickness of the adhesive material 1400 can be set to be greater than the thickness of the coil portions 1120 and 1220. For example, the thickness of the adhesive material 1400 can be set to be at least twice the thickness of the coil portions 1120 and 1220. The adhesive material 1400 formed in this way can help enhance the strength of the coil portions 1120 and 1220 disposed on the upper and lower sides of the adhesive material 1400 in the vertical direction.

[0351] Additionally, the heating coil assembly 1000 of this embodiment may also include outer layers 1300 and 1350. The outer layers 1300 and 1350 may be disposed on the outer side of the coil plate stack 1010 in the vertical direction. For example, the outer layers 1300 and 1350 may be disposed on the upper and lower sides of the coil plate stack 1010, respectively, and a pair of outer layers 1300 and 1350 disposed in this manner may be stacked together with the coil plate stack 1010 in the vertical direction. These outer layers 1300 and 1350 stacked together with the coil plate stack 1010 in the vertical direction may form the upper and lower ends of the coil modules 1001 and 1003.

[0352] The outer layers 1300 and 1350 can be divided into a first outer layer 1300 and a second outer layer 1350. Similar to the first coil portion 1120, the first outer layer 1300 may include a plurality of first coil portions 1120 arranged in a horizontal direction. Furthermore, similar to the second coil portion 1220, the second outer layer 1350 may include a plurality of second coil portions 1220 arranged in a horizontal direction.

[0353] The first outer layer 1300 can form a heating coil WC together with a plurality of first coil portions 1120 stacked in the vertical direction. Furthermore, the second outer layer 1350 can form a heating coil WC together with the second coil portion 1220. That is, the first outer layer 1300 can be vertically connected to the first coil portion 1120, and the second outer layer 1350 can be vertically connected to the second coil portion 1220.

[0354] The first outer layer 1300 can be arranged adjacent to the first coil plate 1100. For example, the first outer layer 1300 can be arranged below the first coil plate 1100 and can be connected to the first coil portion 1120 in the vertical direction. The first outer layer 1300 constructed as described above can form a heating coil WC together with the first coil portion 1120.

[0355] The second outer layer 1350 can be arranged adjacent to the second coil plate 1200. For example, the second outer layer 1350 can be arranged above the second coil plate 1200 and can be connected to the second coil portion 1220 in the vertical direction. The second outer layer 1350 constructed as described above can form a sensing coil SC together with the second coil portion 1220.

[0356] For example, the coil plate stack 1010 can be formed in a structure in which the second coil portion 1220 is stacked on top of a plurality of first coil portions 1120. The coil plate stack 1010 can be arranged between a first outer layer portion 1300 and a second outer layer portion 1350, which are spaced apart from each other in the vertical direction.

[0357] In this configuration, the first outer layer 1300, located below the first coil plate 1100, can form the lower end of coil modules 1001 and 1003, and together with the first coil portion 1120, can form the heating coil WC. Furthermore, the second outer layer 1350, located above the second coil plate 1200, can form the upper end of coil modules 1001 and 1003, and together with the second coil portion 1220, can form the sensing coil SC.

[0358] According to this embodiment, in each of the coil plate portions 1100 and 1200, a pair of coil portions 1120 and 1220 can be arranged in the vertical direction. That is, two layers of coil portions 1120 and 1220 can be formed in each of the coil plate portions 1100 and 1200. The coil plate stack 1010 formed by stacking multiple coil plate portions 1100 and 1200 can include multiple layers of coil portions 1120 and 1220, and can include an even number of layers of coil portions 1120 and 1220.

[0359] Furthermore, the outer layers 1300 and 1350 can each be connected to both sides of the coil plate stack 1010 formed above in the vertical direction, and thus, in each coil module of coil modules 1001 and 1003, multi-layer coil portions 1120 and 1220 can be arranged, and even-numbered coil portions 1120 and 1220 can be arranged.

[0360] The outer layers 1300 and 1350 can be connected to the coil plate stack 1010 via an adhesive material 1400 disposed between the coil portions 1120 and 1220 and the outer layers 1300 and 1350. The adhesive material 1400 can form an insulating layer between the coil portions 1120 and 1220 and the outer layers 1300 and 1350, and can connect the coil plate stack 1010 and the outer layers 1300 and 1350.

[0361] For example, the adhesive material 1400 disposed between the first outer layer portion 1300 (disposed at the lower end of coil modules 1001 and 1003) and the first coil plate portion 1100 can form an insulating layer between the first coil portion 1120 disposed in the first coil plate portion 1100 and the first coil portion 1120 disposed in the first outer layer portion 1300, and can connect the first coil plate portion 1100 and the first outer layer portion 1300.

[0362] Furthermore, the adhesive material 1400 disposed between the second outer layer 1350 (disposed at the upper end of coil modules 1001 and 1003) and the second coil plate 1200 can form an insulating layer between the second coil portion 1220 disposed in the second coil plate 1200 and the second coil portion 1220 disposed in the second outer layer 1350, and can connect the first coil plate 1100 and the outer layers 1300 and 1350.

[0363] In this embodiment, a structure is illustrated in which a coil plate stack 1010, a heating coil WC, and a sensing coil SC are formed by stacking units such as coil plate portions 1100 and 1200 and coil portions 1120 and 1220; however, this disclosure is not limited thereto.

[0364] As another example, without a separate plate, the heating coil WC and coil modules 1001 and 1003 can be formed in a structure in which the conductors of the respective layers are stacked sequentially from the bottom layer. In this case, coil modules 1001 and 1003 can be formed in a structure in which the conductors and adhesive material 1400 used to form the heating coil WC are stacked alternately in the vertical direction.

[0365] Furthermore, although the coil modules 1001 and 1003 have been described above as being formed as a stacked structure of the various components constituting the coil modules 1001 and 1003 (e.g., coil plate portions 1100 and 1200, coil portions 1120 and 1220, and conductors), the coil modules 1001 and 1003 are formed as an integral structure in which the various components constituting the coil modules 1001 and 1003 are integrated.

[0366] That is, the coil modules 1001 and 1003 according to this embodiment are formed as an integral structure, and the individual components constituting the coil modules 1001 and 1003 will not be separated from each other unless a separate process such as cutting or chemical treatment is performed.

[0367] [Shape of the heating coil]

[0368] Figure 27 is a plan view showing an example of a heating coil, and Figure 28 is a plan view showing another example of a heating coil.

[0369] Referring to Figures 17 and 27, the heating coil WC can be formed into a shape including a polygonal shape. For example, the external shape of the heating coil WC in the horizontal direction can be a polygon. In other words, when viewed from above, the heating coil WC can have a polygonal shape.

[0370] As an example, the external shape of the heating coil WC can be substantially rectangular. Furthermore, the external shapes of the coil modules 1001 and 1003, which include the heating coil WC, can also be polygonal. Additionally, the heating coil WC can be formed from a patterned coil patterned on an insulating layer. For example, the heating coil WC may not be formed from a stranded wire (Litz) coil wound into a roughly circular shape, but rather from a patterned coil patterned on an insulating layer.

[0371] Because the heating coil WC is formed in such a pattern shape, the outer shape of the heating coil WC can easily be shaped into a polygon, or more specifically, into a roughly rectangular shape.

[0372] Furthermore, since the external shape of the heating coil WC is formed in this way, the heating coil WC can occupy an area up to very close to the edges of the coil modules 1001 and 1003, and thus can effectively increase the density of the area occupied by the heating coil WC within the coil modules 1001 and 1003.

[0373] Furthermore, the horizontal external shape of each first coil plate portion 1100 provided for each heating coil WC (hereinafter referred to as the "external shape of the first coil plate portion") can be polygonal. For example, the external shape of the first coil plate portion 1100 can be substantially rectangular.

[0374] Furthermore, similar to the shapes of coil modules 1001 and 1003 and the first coil plate portion 1100, the horizontal external shape (hereinafter referred to as "core external shape") of the core 1110 forming the frame of each first coil plate portion 1100 can be a polygonal shape.

[0375] For example, the heating coil WC can be formed into a rectangular spiral shape. For example, the heating coil WC can be formed into a rectangular spiral shape, wherein a first straight line L1 extending in a first direction and a second straight line L2 extending in a second direction are alternately connected to each other. Additionally, the outer shape of the core 1110 of the first coil plate portion 1100 forming the heating coil WC can also be formed into a rectangular shape identical to the outer shape of the heating coil WC.

[0376] Therefore, at least one of the plurality of outer sides of the heating coil WC may include a straight line parallel to the outermost of the plurality of outer sides of the core 1110 closest to the core 1110. For example, a first straight line L1 disposed at the foremost side of the heating coil WC may be formed as a straight line parallel to the foremost outer side of the core 1110, and a second straight line L2 disposed at the rightmost side of the heating coil WC may be formed as a straight line parallel to the rightmost outer side of the core 1110.

[0377] Since the outer shape of the core 1110 and the outer shape of the heating coil WC are formed in the manner described above, the heating coil WC can occupy a region very close to the edges of the coil modules 1001 and 1003, and thus can effectively increase the density of the area occupied by the heating coil WC within the coil modules 1001 and 1003.

[0378] Furthermore, according to this embodiment, each coil module in coil modules 1001 and 1003 may include a plurality of heating coils WC. That is, each coil module in coil modules 1001 and 1003 may include an assembly of a plurality of heating coils WC arranged in a horizontal direction. For example, each coil module in coil modules 1001 and 1003 may be provided with an assembly of heating coils WC, which includes eight heating coils WC arranged in a 2-column × 4-row configuration along the horizontal direction.

[0379] According to this embodiment, the external shape of the heating coil WC assembly can be polygonal. That is, the external shape of each coil module in coil modules 1001 and 1003 and the external shape of the heating coil WC assembly disposed in coil modules 1001 and 1003 can be polygonal.

[0380] For example, the external shape of the heating coil WC assembly can be arranged in a rectangular shape. That is, the multiple heating coils WC disposed in the respective coil modules 1001 and 1003 can be arranged in a rectangular shape.

[0381] As another example, as shown in Figure 28, the external shape of the heating coil WCa can be hexagonal. For example, the heating coil WCa can be formed into a hexagonal spiral shape. Therefore, multiple heating coils WCa can be arranged in a honeycomb shape in the coil module 1001a.

[0382] Since the multiple heating coils WCa, each formed in a hexagonal spiral shape, are arranged in a honeycomb pattern, the centers of all the heating coils WCa in the coil module 1001a can maintain the same spacing. For example, all the heating coils WCa in the coil module 1001a can be arranged such that the center-to-center distance from the adjacent heating coil WCa is maintained at a specified value.

[0383] The advantage of setting the heating coil WCa in the above manner is that by making all center-to-center distances between adjacent heating coils WCa the same, it is possible to facilitate the structural design of the heating coil assembly 1000 for allowing the heating coil WCa to perform the functions of detecting the presence of the object to be heated and heating the object to be heated.

[0384] As another example, the external shape of the heating coil can be circular or elliptical. For instance, the heating coil can be formed into a spiral shape similar to a circle or ellipse. Even in this case, the coil modules can be arranged such that the centers of all the heating coils located in the coil module are spaced at the same interval.

[0385] [Structure of the first vertical connecting part]

[0386] Figure 29 is an enlarged view showing the first coil portion; Figure 30 is a diagram showing an example of the coil pattern stack and the first vertical connection portion; and Figure 31 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connection portion shown in Figure 30. Figure 32 is a diagram showing another example of the coil pattern stack and the first vertical connection portion; Figure 33 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connection portion shown in Figure 32; and Figure 34 is a diagram showing another example of the first vertical connection portion. Figure 35 is a diagram showing an example of the connection structure between the coil pattern stack and the first vertical connection portion shown in Figure 34; and Figure 36 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connection portion shown in Figure 35. Figure 37 is a diagram showing another example of the connection structure between the coil pattern stack and the first vertical connection portion shown in Figure 34; and Figure 38 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connection portion shown in Figure 37. Figure 39 is a diagram showing another example of the connection structure between the coil pattern stack and the first vertical connecting portion, and Figure 40 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connecting portion shown in Figure 39. Figure 41 is a diagram showing another example of the connection structure between the coil pattern stack and the first vertical connecting portion, and Figure 42 is a cross-sectional view showing the structure of the coil pattern stack and the first vertical connecting portion shown in Figure 41.

[0387] Referring to Figures 6, 17, and 29, the heating coil assembly 1000 according to this embodiment may further include a first vertical connecting portion 1030. The first vertical connecting portion 1030 is configured to vertically connect a plurality of first coil portions 1120 stacked in the vertical direction in the respective coil plate stack 1010.

[0388] Each first vertical connecting portion 1030 extends vertically through multiple first coil plate portions 1100 and can be vertically connected to multiple first coil portions 1120 arranged in a straight line in the vertical direction. Each heating coil WC can be formed by vertically connecting multiple first coil portions 1120 arranged in a straight line in the vertical direction through the first vertical connecting portions 1030.

[0389] Each first vertical connecting portion 1030 may include a via V. For each first coil portion 1120, each via V may be vertically connected one after another to multiple coil patterns Cp stacked in the vertical direction.

[0390] For example, each via V can be connected to a coil pattern Cp in each first coil plate portion 1100, and multiple coil patterns Cp stacked in the vertical direction can be connected vertically. Furthermore, in each first coil portion 1120, each via V can be connected to a coil pattern Cp in the horizontal direction.

[0391] As an example, the first coil portion 1120 can be formed in a rectangular spiral shape. For instance, the first coil portion 1120 can be formed in a rectangular spiral shape, wherein a first straight line L1 extending in a first direction and a second straight line L2 extending in a second direction are alternately connected.

[0392] According to this embodiment, in each first coil portion 1120, the area where the coil pattern Cp is arranged can be divided into a plurality of division regions 1120a. The plurality of division regions 1120a can be arranged along the diametrical direction (hereinafter referred to as the "diametrical direction") of the spiral formed by the first coil portions 1120.

[0393] For example, when a cross-section of each first coil portion 1120 is viewed in the vertical direction, the plurality of division regions 1120a may be arranged in the horizontal direction. As an example, when the first coil portion 1120 includes six coil patterns Cp, each division region 1120a may include six coil patterns Cp arranged in the diametrical direction.

[0394] In Figure 29, a first coil portion 1120 is exemplarily shown comprising six coil patterns Cp; however, this disclosure is not limited thereto. As another example, the first coil portion 1120 may include four coil patterns Cp, and thus each partitioned region 1120a may include four coil patterns Cp arranged along a diametrical direction (see Figure 34). As yet another example, the first coil portion 1120 may include three coil patterns Cp, and thus each partitioned region 1120a may include three coil patterns Cp arranged along a diametrical direction.

[0395] As described above, the first coil portion 1120, which includes multiple division regions 1120a, may further include a partition region 1120b in which no coil pattern Cp is arranged. According to this embodiment, the multiple division regions 1120a provided in the first coil portion 1120 may be arranged to be spaced apart from each other at predetermined intervals along the diametrical direction. The partition region 1120b may be arranged in the gaps between the multiple division regions 1120a. That is, in each first coil portion 1120, the division regions 1120a and the partition regions 1120b may be arranged alternately in the diametrical direction.

[0396] For example, when observing the vertical cross-section of each first coil portion 1120, multiple dividing regions 1120a and separating regions 1120b can be arranged in the horizontal direction, and the dividing regions 1120a and separating regions 1120b can be arranged alternately in the horizontal direction.

[0397] The first vertical connecting portion 1030 can be arranged in the partition region 1120b. That is, the first vertical connecting portion 1030 can be provided in the gap between the plurality of partition regions 1120a, and can include at least one through hole V arranged in the partition region 1120b.

[0398] According to this embodiment, a plurality of coil patterns Cp arranged along the diametrical direction form a coil line 1123 or 1124, and the coil line 1123 or 1124 can be wound multiple times to form a first coil portion 1120. That is, in each coil line 1123 or 1124, a plurality of coil patterns Cp can be arranged in the diametrical direction, and each coil pattern Cp can extend along the circumferential direction (hereinafter referred to as the "circumferential direction") of the spiral formed by the first coil portion 1120.

[0399] As described above, the multiple coil patterns Cp forming coil lines 1123 and 1124 can form a twisted structure within the heating coil WC. For example, as shown in FIG30, each coil pattern Cp can extend along the circumferential direction and can extend along a direction between the circumferential direction and the diametrical direction. That is, each coil pattern Cp forming coil lines 1123 and 1124 can extend along the circumferential direction while forming an oblique line inclined in the diametrical direction.

[0400] For example, a coil pattern Cp can be arranged at one position in the circumferential direction of coil line 1123 or 1124 at the outermost position in the diametrical direction of coil line 1123 or 1124, at another position in the circumferential direction of coil line 1123 or 1124 at the center position in the diametrical direction of coil line 1123 or 1124, and at yet another position in the circumferential direction at the innermost position in the diametrical direction of coil line 1123 or 1124.

[0401] That is, by changing the diameter direction position of the coil pattern Cp within the coil line 1123 or 1124, each coil line in the coil lines 1123 and 1124 forming the first coil portion 1120 can form a horizontally twisted structure within the first coil portion 1120.

[0402] In this embodiment, coil lines 1123 and 1124 are exemplarily divided into a first coil line 1123 and a second coil line 1124. In the first coil line 1123, each coil pattern Cp can extend along the circumferential direction while forming an oblique line inclined towards the centripetal direction. In the second coil line 1124, each coil pattern Cp can extend along the circumferential direction while forming an oblique line inclined towards the centrifugal direction.

[0403] According to this embodiment, the first coil wire 1123 and the second coil wire 1124 stacked in the vertical direction can be connected in the vertical direction to form a heating coil WC, and the first vertical connecting portion 1030 can connect the first coil wire 1123 and the second coil wire 1124 stacked in the vertical direction in the vertical direction.

[0404] Each first vertical connecting portion 1030 can be connected to a coil pattern Cp for each coil line 1123 or 1124, and can connect multiple coil patterns Cp stacked in the vertical direction. Furthermore, each coil pattern Cp can be connected to multiple first vertical connecting portions 1030 arranged in the circumferential direction. That is, each coil pattern Cp can be vertically connected to another coil pattern Cp arranged above or below it at multiple locations in the circumferential direction.

[0405] Therefore, the connection between the first coil line 1123 and the second coil line 1124 is made in such a way that the coil pattern Cp of the first coil line 1123 and the coil pattern Cp of the second coil line 1124 are alternately connected to each other. That is, the first coil line 1123 and the second coil line 1124 stacked in the vertical direction can form a vertical twisted structure within the heating coil WC in such a way that the first coil line 1123 and the second coil line 1124 are alternately connected to each other.

[0406] Therefore, each coil wire 1123 or 1124 forming the first coil portion 1120 can form a horizontal twisted structure within the first coil portion 1120, and the first coil wire 1123 and the second coil wire 1124 stacked in the vertical direction can form a vertical twisted structure, so that the multiple coil patterns Cp forming the heating coil WC can form a braided twisted structure.

[0407] The twisted structure of the heating coil WC formed in this way not only allows for an increase in the length of the connecting body formed by connecting multiple coil patterns Cp to form the heating coil WC, but also provides the advantage of preventing the position of each coil pattern Cp from being biased only to the innermost or outermost side within each heating coil WC.

[0408] Additionally, referring to Figures 29 to 31, each via V may include a hole portion Va, an inner wall portion Vb, and a platform portion Vc. The hole portion Va may be formed as a hole shape that penetrates at least a portion of the coil plate stack 1010 in the vertical direction. The hole portion Va may penetrate in the vertical direction the region of the coil plate stack 1010 in which the first coil plate portion 1100 is stacked.

[0409] The inner wall portion Vb can be disposed inside the hole portion Va and can be vertically connected to multiple coil patterns Cp stacked in the vertical direction. The inner wall portion Vb can include conductors disposed in the hole portion Va and can be electrically connected to the multiple coil patterns Cp stacked in the vertical direction. For example, the inner wall portion Vb can be formed as a copper plating layer plated on the inner wall of the first coil plate portion 1100 surrounding the hole portion Va.

[0410] The platform portion Vc can be electrically connected to the inner wall portion Vb and the coil pattern Cp. The platform portion Vc can be formed as a copper plating layer plated on the upper or lower surface of the first coil plate portion 1100, and can be electrically connected to the inner wall portion Vb and the coil pattern Cp respectively.

[0411] Each of the first vertical connecting portions 1030 constructed in the above manner may also include a via connecting portion Vd. The via connecting portion Vd is used to electrically connect the coil pattern Cp and the via V, and more specifically, to electrically connect the coil pattern Cp and the platform portion Vc. The via connecting portion Vd may be formed as a pattern shape protruding from the coil pattern Cp toward the separating region 1120b in the horizontal direction.

[0412] For example, the via connection Vd can be formed to extend from the coil pattern Cp along the direction between the diameter direction and the circumferential direction of the spiral formed by the first coil portion 1120. For example, the via connection Vd can be formed as a straight line connecting the coil pattern Cp and the via V in the direction between the diameter direction and the circumferential direction.

[0413] Each via V provided in the above manner can be connected to a coil pattern Cp for each coil line 1123 or 1124, and multiple coil patterns Cp can be connected in the vertical direction. The first vertical connection portion 1030 including the via V can be electrically connected to multiple coil patterns Cp stacked in the vertical direction.

[0414] For example, a heating coil WC can be formed by connecting multiple coil lines 1123 and 1124 stacked in the vertical direction in the vertical direction, and can be formed, by way of connecting a group of multiple first coil lines 1123 connected in the vertical direction to a group of multiple second coil lines 1124 connected in the vertical direction.

[0415] For example, the heating coil WC can be formed by four to five first coil lines 1123 connected continuously in the vertical direction and four to five second coil lines 1124 connected continuously in the vertical direction below the group.

[0416] The heating coil WC with this structure is advantageous in responding to situations where interlayer coil lines 1123 and 1124 are unintentionally joined due to various reasons that cannot be identified because of the fine machining characteristics. The arrangement of coil lines 1123 and 1124 with the above structure can be a structure that can improve the reliability of coil formation because coil lines 1123 and 1124 with the same current direction are arranged adjacent to each other.

[0417] As another example, as shown in Figures 32 and 33, the first coil wire 1123 and the second coil wire 1124 can be arranged alternately in the vertical direction. That is, with the first coil wire 1123 and the second coil wire 1124 arranged alternately in the vertical direction, a vertical connection between the first coil wire 1123 and the second coil wire 1124 can be performed, and a heating coil WC can be formed by connecting multiple first coil wires 1123 and second coil wires 1124 in this way in the vertical direction.

[0418] When coil lines 1123 and 1124 are connected continuously, the current may be concentrated at the midpoint of the orifice V in the vertical direction, that is, at the point where the first coil line 1123 and the second coil line 1124 come into contact with each other. Therefore, the heat generation at the corresponding part may increase, and the current may become difficult to flow smoothly through the orifice V (see Figures 31 and 32).

[0419] In contrast, when coil lines 1123 and 1124 are arranged alternately, each first coil line 1123 can be arranged in pairs adjacent to the corresponding second coil line 1124. Therefore, when coil lines 1123 and 1124 are arranged alternately, the current can be shunted and flow, and the generated heat can be relatively reduced. That is, not only can the current flow smoothly through the via V, but the phenomenon of heat concentration in a portion of the via V can also be effectively suppressed.

[0420] As described above, each of the first vertical connecting portions 1030 that connects the first coil line 1123 and the second coil line 1124 in the vertical direction may include at least one through hole V. For example, each of the first vertical connecting portions 1030 may include one through hole V.

[0421] According to this embodiment, via V can be provided in the partition region 1120b. For example, via V can be arranged further inward than the innermost coil pattern Cp arranged in the diameter direction among the plurality of coil patterns Cp forming the coil lines 1123 and 1124, or via V can be arranged further outward than the outermost coil pattern Cp arranged in the coil pattern Cp.

[0422] For example, the distance between the innermost coil pattern in a plurality of coil patterns Cp and the center of the via V, or the distance between the outermost coil pattern in a plurality of coil patterns Cp and the center of the via V, can be set to be longer than the radius of the via V.

[0423] Therefore, the via V arranged in the partition region 1120b can be in a position that does not contact another coil pattern Cp adjacent in the diametrical direction, that is, coil pattern Cp other than the coil pattern Cp directly connected to the via V.

[0424] Furthermore, the vertical distance between the center of via V and the first straight line L1, or the vertical distance between the center of via V and the second straight line L2, can be set to be longer than the radius of via V. Additionally, the horizontal length of the partition region 1120b can be formed to be longer than the diameter of via V. In these cases, via V can also be arranged in the partition region 1120b such that there is no contact between via V and the coil pattern Cp.

[0425] As another example, each of the first vertical connecting portions 1030 may include a plurality of through holes V, as shown in Figures 34 to 36. For example, each of the first vertical connecting portions 1030 may include a plurality of through holes V arranged along the circumferential direction (hereinafter referred to as the circumferential direction) of the spiral formed by the first coil portion 1120.

[0426] Each via V included in the first vertical connecting portion 1030 can form a channel connecting multiple coil patterns Cp stacked in the vertical direction. The width of each channel formed by the via V is mainly related to the area of ​​the inner wall portion Vb. That is, when the area of ​​the inner wall portion Vb increases, the width of the via formed by the via V will increase.

[0427] The area of ​​the inner wall portion Vb is mainly related to the diameter of the hole portion Va. That is, as the diameter of the hole portion Va increases, the area of ​​the inner wall portion Vb can increase, and therefore, the channel formed by the through hole V can be widened. When the first vertical connecting portion 1030 includes a single through hole V, the diameter of the hole portion Va must be increased to increase the area of ​​the inner wall portion Vb.

[0428] However, since the via V must be arranged in the partition region 1120b, i.e., the region where the coil pattern Cp is not arranged, increasing the diameter of the via Va requires a corresponding increase in the size of the partition region 1120b. For this purpose, not only the circumferential length of the partition region 1120b but also its diametrical length must be increased. However, when the diametrical length of the partition region 1120b is increased, the size of the available area for arranging the coil pattern Cp in the first coil portion 1120 inevitably decreases.

[0429] Considering the above, in this embodiment, each first vertical connecting portion 1030 can be formed by a plurality of through holes V arranged along the circumferential direction. Therefore, each first vertical connecting portion 1030 can form a plurality of channels that connect a plurality of coil patterns Cp stacked in the vertical direction.

[0430] That is, multiple coil patterns Cp stacked in the vertical direction can be connected in the vertical direction through multiple channels formed by multiple through holes V constituting a first vertical connection portion 1030.

[0431] In each of the first vertical connecting portions 1030, the multiple vias V arranged in the horizontal direction can be electrically connected to each other. That is, in each of the first vertical connecting portions 1030, the electrical connection between the multiple vias V can be established by electrically connecting to the coil pattern Cp of the multiple vias V, or by connecting the platform portions Vc provided in each via V to each other.

[0432] As described above, since the first vertical connecting portion 1030 includes multiple through holes V, the area of ​​the inner wall portion Vb of the first vertical connecting portion 1030 can be increased, thereby reducing the resistance in the first vertical connecting portion 1030 and reducing the heat generated in the first vertical connecting portion 1030.

[0433] As described above, a plurality of vias V constituting the first vertical connecting portion 1030 are arranged in the partition region 1120b and can be connected to via connecting portions Vd protruding from the coil pattern Cp into the partition region 1120b. In this case, each via connecting portion Vd can form a straight line extending from the coil pattern Cp in a direction between the diametrical direction and the circumferential direction, and the plurality of vias V connected thereto can be arranged along the circumferential direction.

[0434] When the first coil portion 1120 is formed into a rectangular spiral shape, the first vertical connecting portion 1030 can be connected to either the first straight line L1 or the second straight line L2. When the first vertical connecting portion 1030 is connected to the first straight line L1, the first vertical connecting portion 1030 may include a plurality of through holes V arranged along a first direction. When the first vertical connecting portion 1030 is connected to the second straight line L2, the first vertical connecting portion 1030 may include a plurality of through holes V arranged along a second direction.

[0435] The first vertical connecting portion 1030 and the plurality of through holes V included therein are arranged in the partition region 1120b. Therefore, the first vertical connecting portions 1030 connected to the first straight line L1 can be arranged along the second direction, and the first vertical connecting portions 1030 connected to the second straight line L2 can be arranged along the first direction. That is, the first vertical connecting portions 1030 connected to the first straight line L1 can be arranged along the diameter direction, and the first vertical connecting portions 1030 connected to the second straight line L2 can also be arranged along the diameter direction.

[0436] Since multiple vias V form multiple paths in each of the first vertical connecting portions 1030, the area of ​​the paths formed by each of the first vertical connecting portions 1030 can be increased compared to the case where the vertical connecting portion includes only a single via V. For example, the area of ​​the paths formed by the first vertical connecting portions 1030 can be increased proportionally to the number of vias V.

[0437] According to this embodiment, the plurality of through holes V forming each first vertical connecting portion 1030 can be arranged in a circumferential direction. That is, in each first vertical connecting portion 1030, the plurality of through holes V can be arranged not in a direction parallel to the straight line formed by the through hole connecting portion Vd, but in a circumferential direction.

[0438] If multiple vias V are arranged in the first vertical connecting portion 1030 in a direction parallel to the straight line formed by the via connecting portion Vd, for example, in a direction between the diametrical direction and the circumferential direction, it may be necessary to increase the size of the partition region 1120b in which the first vertical connecting portion 1030 is arranged, reduce the number of vias V, or reduce the size of each via V.

[0439] In contrast, in this embodiment, the plurality of through holes V in the first vertical connecting portion 1030 are arranged in the circumferential direction. Therefore, even when each of the first vertical connecting portions 1030 includes a plurality of through holes V, it is not necessary to increase the size of the partition region 1120b in which the first vertical connecting portions 1030 are arranged, and in particular, it is not necessary to increase the length of the partition region 1120b in the diametrical direction.

[0440] As a result, the first vertical connecting portion 1030 according to this embodiment can effectively increase the area of ​​the path formed by the first vertical connecting portion 1030 for vertically connecting multiple coil patterns Cp, while suppressing the reduction in the size of the area that can be used to arrange the coil patterns Cp in the first coil portion 1120.

[0441] In this embodiment, the plurality of through holes V constituting the first vertical connecting portion 1030 are arranged, by way of example, in a direction parallel to the circumferential direction; however, this disclosure is not limited thereto.

[0442] As another example, vias V can be arranged along the diametrical direction or along the direction between the diametrical direction and the circumferential direction, as long as vias V do not extend beyond the dividing area 1120b, and vias V can be arranged to form a broken line or curve instead of a straight line, or can be arranged in a polygonal, circular or elliptical shape.

[0443] For example, the distance between the innermost coil pattern in a plurality of coil patterns Cp and the center of the via V, or the distance between the outermost coil pattern in a plurality of coil patterns Cp and the center of the via V, can be set to be longer than the radius of the via V.

[0444] Therefore, the via V arranged in the partition region 1120b can be arranged so as not to contact another coil pattern Cp adjacent in the diametrical direction, that is, coil pattern Cp other than the coil pattern Cp directly connected to the via V.

[0445] Furthermore, the vertical distance between the center of via V and the first straight line L1, or the vertical distance between the center of via V and the second straight line V, can be set to be longer than the radius of via V. Additionally, the horizontal length of the separating region 1120b can be formed to be longer than the diameter of via V. In these cases, via V can also be provided within the separating region 1120b such that there is no contact between via V and the coil pattern Cp.

[0446] As another example, as shown in Figures 37 and 38, multiple vias V can be provided in the first vertical connection portion 1030, and the first coil line 1123 and the second coil line 1124 can be arranged alternately in the vertical direction.

[0447] As another example, as shown in Figures 39 and 40, the first vertical connection portion 1030 may include more than two through holes V, for example, five through holes V, and the multiple through holes V may be arranged along the circumferential direction.

[0448] As another example, as shown in Figures 41 and 42, more than two through holes V can be provided in the first vertical connection portion 1030, and the first coil wire 1123 and the second coil wire 1124 can be arranged alternately in the vertical direction.

[0449] As another example, two or more coil patterns Cp can be arranged along the diameter direction. Furthermore, the horizontal length of the separating region 1120b can be formed to be twice the diameter of the via V. For example, when two coil patterns Cp are arranged in the diameter direction, the horizontal length of the separating region 1120b can be formed to be twice the diameter of the via V, and when three or more coil patterns Cp are arranged in the diameter direction, the horizontal length of the separating region 1120b can be formed to be three times the diameter of the via V.

[0450] Therefore, even when multiple vias V are arranged in the partition region 1120b along the diametrical direction, the vias V can be arranged in the partition region 1120b so that there is no contact between the vias V and the coil pattern Cp.

[0451] [Structure of the sensing coil]

[0452] Figure 43 is a cross-sectional view showing an example of the stacked structure of the second outer layer and the second coil plate, Figure 44 is an enlarged view showing a magnified portion of the second outer layer, and Figure 45 is an enlarged view showing a magnified portion of the second coil plate.

[0453] According to this embodiment, as shown in FIG7 and FIGS. 43 to 37, the sensing coil SC can be formed from the second coil portion 1220 disposed in the second coil plate portion 1200. Each sensing coil SC can be formed from one second coil portion 1220, or it can be formed by connecting multiple second coil portions 1220 stacked in the vertical direction.

[0454] For example, the sensing coil SC can be arranged above the heating coil WC. Furthermore, each of the second coil plates 1200 may include a core 1210 and a second coil portion 1220. Additionally, each of the second coil plates 1200 may also include a first coil portion 1120.

[0455] The second coil portion 1220 may be arranged on at least one side of the core 1210 in the vertical direction, on one side and the other side. For example, when the second coil plate portion 1200 includes both the first coil portion 1120 and the second coil portion 1220, the first coil portion 1120 may be arranged on one side of the core 1210 in the vertical direction, and the second coil portion 1220 may be arranged on the other side of the core 1210 in the vertical direction. For example, the first coil portion 1120 may be provided in a patterned form below the core 1210, while the second coil portion 1220 may be provided in a patterned form above the core 1210.

[0456] When the second coil plate portion 1200 includes only the core 1210 and the second coil portion 1220, the second coil portion 1220 can be arranged on both sides of the core 1210 in the vertical direction. For example, each of the second coil plate portions 1200 can be configured such that a layer of the second coil portion 1220 is formed on each of the two sides of the core 1210 in the vertical direction. Similar to the first coil portion 1120, such a second coil portion 1220 can be provided in a patterned form on both sides of the core 1210 in the vertical direction.

[0457] In this embodiment, each second coil plate portion 1200 is shown as including a core 1210, a first coil portion 1120 and a second coil portion 1220, wherein the first coil portion 1120 is provided in a patterned form below the core 1210 and the second coil portion 1220 is provided in a patterned form above the core 1210.

[0458] Furthermore, the second outer layer 1350 can be arranged above the second coil plate 1200, and the second outer layer 1350 may include a second coil portion 1220 similar to the second coil plate 1200. A second coil portion 1220 disposed in the second coil plate 1200 and a second coil portion 1220 disposed in the second outer layer 1350 can be connected in the vertical direction to form a sensing coil SC.

[0459] Furthermore, multiple second coil portions 1220 may be arranged horizontally in each of the second coil plate portion 1200 and the second outer layer portion 1350, so the coil modules 1001 and 1003 may include multiple sensing coils SC arranged horizontally.

[0460] In each of the coil modules 1001 and 1003, the sensing coil SC can be arranged on the outer side of the first coil plate portion 1100 in the vertical direction. For example, the sensing coil SC can be arranged above or below the first coil plate portion 1100.

[0461] As another example, the sensing coil SC can be arranged below the heating coil WC. In this case, the second coil plate portion 1200 can be arranged below the first coil plate portion 1100, and the second coil portion 1220 can be arranged below the core 1210. Additionally, an outer layer portion 1300 or 1350, formed in the same or similar form as the second coil portion 1220, can be disposed below the second coil portion 1220 and can be vertically connected to the second coil portion 1220.

[0462] As another example, the sensing coil SC can be arranged inside the heating coil WC. In this case, at least one first coil plate portion 1100 can be arranged below the second coil plate portion 1200, and at least one first coil plate portion 1100 can also be arranged above the second coil plate portion 1200. Therefore, the sensing coil SC can be arranged between the stacks of the first coil plate portions 1100, thereby being arranged inside the heating coil WC formed by the stacks of the first coil plate portions 1100.

[0463] Additionally, the heating coil assembly 1000 according to this embodiment may also include a second vertical connecting portion 1040. The second vertical connecting portion 1040 is configured to connect in the vertical direction to a coil plate stack 1010 having second coil plate portions 1200 and second outer layer portions 1350 stacked in the vertical direction, or a coil plate stack 1010 having a plurality of second coil plate portions 1200 stacked in the vertical direction.

[0464] Each coil module in coil modules 1001 and 1003 may include a plurality of second vertical connecting portions 1040. Each second vertical connecting portion 1040 may be vertically connected to a plurality of second coil portions 1220 arranged in the same straight line in the vertical direction.

[0465] For example, when the second outer layer 1350 is stacked above the second coil plate 1200 in the coil plate stack 1010, each of the second vertical connecting portions 1040 can penetrate the second outer layer 1350 and the second coil plate 1200 in the vertical direction, and can connect the second coil portion 1220 in the vertical direction. In this case, since the second coil portion 1220 and the second coil plate 1200 of the second outer layer 1350 stacked in the vertical direction are connected in the vertical direction by the second vertical connecting portions 1040, each sensing coil SC can be formed.

[0466] As another example, when multiple second coil portions 1220 are stacked vertically in the respective coil plate stacks 1010, each second vertical connecting portion 1040 can penetrate the multiple second coil plate portions 1200 vertically and connect the second coil portions 1220 vertically. In this case, since the second coil portions 1220 of the multiple second coil plate portions 1200 stacked vertically are connected vertically by the second vertical connecting portions 1040, each sensing coil SC can be formed.

[0467] The second vertical connecting portion 1040 can be disposed in the area of ​​the second coil plate portion 1200 where the first coil portion 1120 is not disposed, and can be connected in the horizontal direction to the second coil portion 1220 or the outer layer portion 1300 or 1350. Similar to the first vertical connecting portion 1030, each of the second vertical connecting portions 1040 can include a through hole V.

[0468] Each via V can be vertically connected to the outer layer portion 1300 or 1350 and the second coil portion 1220, which are arranged in a straight line in the vertical direction. Each such via V can be arranged in the area of ​​the second coil plate portion 1200 where the first coil portion 1120 is not provided, and can be horizontally connected to the second coil portion 1220 or the outer layer portion 1300 or 1350.

[0469] According to this embodiment, at least one of the plurality of second coil portions 1220 arranged in the horizontal direction can be arranged at a position that overlaps with the unpatterned area 1103 or 1105 of the first coil portion 1120 in the vertical direction. In this case, at least a portion of the corresponding second coil portion 1220 can be arranged at a position that overlaps with the unpatterned area 1103 or 1105 of the first coil portion 1120 in the vertical direction.

[0470] More specifically, at least one of the plurality of second coil portions 1220 arranged horizontally can be positioned at a location overlapping the second unpatterned region 1105 in the vertical direction. In this case, at least a portion of the corresponding second coil portion 1220 can be arranged at a location overlapping the second unpatterned region 1105 in the vertical direction.

[0471] Furthermore, the second vertical connecting portion 1040 connected to the second coil portion 1220 and the via V included therein can be arranged at a position that overlaps with the second unpatterned area 1105 in the vertical direction.

[0472] Furthermore, each heating coil WC can be arranged to be spaced apart by a predetermined distance from another heating coil WC adjacent to it in the first direction, and can also be arranged to be spaced apart by a predetermined distance from another heating coil WC adjacent to it in the second direction. That is, a separation space can be formed between two adjacent heating coils WC along the first direction, and also between two adjacent heating coils WC along the second direction.

[0473] According to this embodiment, at least one of the plurality of second coil portions 1220 can be disposed at a position overlapping with the partition space formed between two adjacent heating coils WC in the second direction along the vertical direction. In this case, at least a portion of the corresponding second coil portion 1220 can be arranged at the position overlapping with the partition space in the vertical direction.

[0474] Furthermore, the second vertical connecting portion 1040 connected to the second coil portion 1220 and the via V included therein can be arranged at a position that overlaps with the partition space in the vertical direction.

[0475] Typically, the second vertical connecting portion 1040 is formed after the first coil plate portion 1100 and the second coil plate portion 1200 have been stacked to form the coil plate stack 1010. That is, the hole portion Va for the through hole V used to form the second vertical connecting portion 1040 is processed while both the first coil plate portion 1100 and the second coil plate portion 1200 are stacked.

[0476] However, if the second vertical connecting portion 1040 is positioned to overlap with the coil pattern Cp of the first coil portion 1120 in the vertical direction, damage to the coil pattern Cp may occur due to the drilling operation used to process the hole portion Va. In contrast, if the formation of the second vertical connecting portion 1040 is performed before stacking the first coil plate portion 1100 and the second coil plate portion 1200, the formation of the first vertical connecting portion 1030 and the second vertical connecting portion 1040 will inevitably be performed separately. In this case, the workload required to manufacture the heating coil assembly 1000 increases, and the manufacturing cost increases.

[0477] Considering these points, in this embodiment, the second vertical connecting portion 1040 is arranged at a position that overlaps with the unpatterned areas 1103 and 1105 of the first coil portion 1120 in the vertical direction. Accordingly, since the second vertical connecting portion 1040 is arranged at a position that does not overlap with the coil pattern Cp of the first coil portion 1120 in the vertical direction, the drilling operation used to form the second vertical connecting portion 1040 does not affect the unpatterned areas 1103 and 1105 of the first coil portion 1120.

[0478] That is, as exemplified in this embodiment, when the second vertical connecting portion 1040 is arranged as described above, even if the drilling operation for forming the second vertical connecting portion 1040 is performed after the stacking of the first coil plate portion 1100 and the second coil plate portion 1200 to form the coil plate stack 1010 has been completed, the possibility of damage to the coil pattern Cp due to the drilling operation can be greatly reduced.

[0479] Therefore, the heating coil assembly 1000 according to this embodiment can effectively suppress the occurrence of damage to the coil pattern Cp caused by the operation for forming the via V, while suppressing the increase in workload and manufacturing cost required to manufacture the heating coil assembly 1000.

[0480] [Structure of the connector]

[0481] Figure 46 is an enlarged view of the first coil plate portion, Figure 47 is a view showing the second terminal and the second connector separated from each other, and Figure 48 is a cross-sectional view schematically showing the stacked structure of the second terminal and the second connector shown in Figure 47.

[0482] Referring to Figures 7, 17, 20, and 44 to 48, a connector 1020 can be provided for connection between the power supply unit and the heating coil WC. For example, the connector 1020 can be electrically connected to the heating coil WC, and can also be electrically connected to the drive circuit 300 and the load circuit 350.

[0483] In the horizontal direction, the connector 1020 can be arranged outside a plurality of heating coils WC. The connector 1020 can be provided to connect to at least one of the first terminal 1121 and the second terminal 1122.

[0484] The connector 1020 may include a first connector 1021. The first connector 1021 is connected to a first terminal 1121. The first connector 1021 can be connected to the heating coil WC via the first terminal 1121.

[0485] Furthermore, connector 1020 may include a second connector 1023. The second connector 1023 is connected to a second terminal 1122. The second connector 1023 can be connected to the heating coil WC via the second terminal 1122.

[0486] The first terminal 1121 and the second terminal 1122 may be respectively disposed in the first coil plate portion 1100 and the first outer layer portion 1300. That is, the first terminal 1121 and the second terminal 1122 may be formed in the same layer as the layer forming the first coil portion 1120.

[0487] According to this embodiment, in each of the coil modules 1001 and 1003, multiple heating coils WC can be arranged in a matrix. That is, the multiple heating coils WC can be arranged along a first direction, and the multiple heating coils WC can also be arranged along a second direction.

[0488] For example, each connector 1020 may include a plurality of first connectors 1021 arranged in the first direction. Additionally, in each coil module of coil modules 1001 and 1003, a plurality of adjacent heating coils WC in the second direction may be connected to operate simultaneously.

[0489] Accordingly, each of the first connectors 1021 can be connected to a heating coil WC. Furthermore, the second connector 1023 can be connected to a plurality of adjacent heating coils WC in the second direction.

[0490] For example, when multiple heating coils WC are arranged in a 2-column × 4-row configuration in each coil module 1001 and 1003, a pair of connectors 1020 can be provided in each coil module 1001 and 1003. The pair of connectors 1020 can be arranged to be spaced apart from each other in a first direction, with a group of multiple heating coils WC located between the pair of connectors 1020. That is, one connector of the pair of connectors 1020 can be arranged on the front side of the group of multiple heating coils WC, while the other connector of the pair of connectors 1020 can be arranged on the rear side of the group of multiple heating coils WC.

[0491] In each coil module of coil modules 1001 and 1003, multiple heating coils WC can be divided into two halves, each half having a 2-column × 2-row configuration, and each connector 1020 can be connected to the adjacent 2-column × 2-row heating coil WC. For example, one connector of a pair of connectors 1020 located on the front side can be connected to four heating coils WC located on the front side of coil modules 1001 and 1003, while the other connector of a pair of connectors 1020 located on the rear side can be connected to four heating coils WC located on the rear side of coil modules 1001 and 1003.

[0492] As described above, the first terminal 1121 can be connected to the outermost horizontal end of the heating coil WC, and the second terminal 1122 can be connected to the innermost end of the heating coil WC. For example, each of the first terminals 1121 can be arranged in a position biased toward the connector 1020 to which the first terminal 1121 is to be connected.

[0493] That is, regarding the second direction, each first terminal 1121 can be arranged closer to the end of the heating coil WC than to the center of the heating coil WC, and can be positioned biased toward the connector 1020 to which the first terminal 1121 is to be connected. For example, the first terminals 1121 provided in the four heating coils WC adjacent to the connector 1020 arranged on the front side of the pair of connectors 1020 can be positioned biased toward the front side of the heating coil WC.

[0494] According to this embodiment, each connector 1020 may include a pair of first connectors 1021 arranged along a first direction. Each first connector 1021 may be connected to a first terminal 1121, thereby connecting to only one heating coil WC. Each of the first connectors 1021 can electrically connect the heating coil WC one after another to a power supply, such as a drive circuit 300 and a load circuit 350.

[0495] The second connector 1023 can connect the heating coil WC to ground. The second connector 1023 can be connected to a pair of adjacent second terminals 1122 in the second direction. That is, the second connector 1023 can connect a pair of adjacent heating coils WC in the second direction to ground.

[0496] Furthermore, each connector 1020 may also include a third connector 1025. The third connector 1025 can connect the heating coil SC to the power supply. The third connector 1025 may be disposed in the second outer layer 1350 and may also be disposed in the second coil plate 1200.

[0497] For example, connectors 1020 may be respectively disposed in the first coil plate portion 1100, the second coil plate portion 1200, and the outer layer portions 1300 and 1350 stacked in the vertical direction. For example, the first connectors 1021 disposed in the first coil plate portion 1100, the second coil plate portion 1200, the first outer layer portion 1300, and the second outer layer portion 1350 may be stacked in the vertical direction and electrically connected through the through-hole V.

[0498] Furthermore, the second connectors 1023 respectively provided in the first coil plate portion 1100, the second coil plate portion 1200, the first outer layer portion 1300 and the second outer layer portion 1350 can be stacked in the vertical direction, and the second connectors 1023 stacked in the vertical direction can be electrically connected through the through hole V.

[0499] As another example, connector 1020 may be provided only in the second outer layer 1350. That is, connector 1020 may be arranged on the upper end of only coil modules 1001 and 1003.

[0500] According to this embodiment, each coil module in coil modules 1001 and 1003 includes a plurality of sensing coils SC, and the plurality of sensing coils SC can be arranged to be spaced apart from each other by a predetermined distance along a first direction. Furthermore, similar to the first coil plate portion 1100, the second outer layer portion 1350 and the second coil plate portion 1200 can respectively include a first terminal 1121 and a second terminal 1122. That is, the first terminal 1121 and the second terminal 1122 can also be formed in the same layer as the layer forming the second coil portion 1220.

[0501] Furthermore, at least one of the first terminal 1121 and the second terminal 1122 may include a via V. In this embodiment, the first terminal 1121 and the second terminal 1122 are shown as each including a plurality of vias V, and the plurality of vias V in each of the first terminal 1121 and the second terminal 1122 are arranged in a horizontal direction.

[0502] According to this embodiment, the first terminals 1121 respectively disposed in the first coil plate portion 1100, the second coil plate portion 1200, and the second outer layer portion 1350 can be stacked in the vertical direction, and the first terminals 1121 stacked in the vertical direction can be electrically connected through the through-hole V. Furthermore, the second terminals 1122 respectively disposed in the first coil plate portion 1100 and the second coil plate portion 1200 can be stacked in the vertical direction, and the second terminals 1122 stacked in the vertical direction can be electrically connected through the through-hole V.

[0503] For example, each via V can penetrate vertically through the first coil plate portion 1100 and the second coil plate portion 1200 stacked vertically. The via V provided in the first terminal 1121 can connect to a plurality of first terminals 1121 arranged in a straight line in the vertical direction. Furthermore, the via V provided in the second terminal 1122 can connect to a plurality of second terminals 1122 arranged in a straight line in the vertical direction.

[0504] Furthermore, at least one of the second coil plate portion 1200 and the second outer layer portion 1350 may include a first wiring pattern Wpa and a second wiring pattern Wpb. For example, the first wiring pattern Wpa and the second wiring pattern Wpb may be formed in the second coil plate portion 1200 and the second outer layer portion 1350, respectively. As another example, the first wiring pattern Wpa and the second wiring pattern Wpb may be formed only in the second outer layer portion 1350.

[0505] In this embodiment, the first wiring pattern Wpa and the second wiring pattern Wpb are shown to be formed in the second coil plate portion 1200 and the second outer layer portion 1350, respectively. Accordingly, the first wiring pattern Wpa can be provided to electrically connect the first connector 1021 and the first terminal 1121 on the outer side of the first coil plate portion 1100 in the vertical direction. Furthermore, the second wiring pattern Wpb can be provided to electrically connect the second connector 1023 and the second terminal 1122 on the outer side of the first coil plate portion 1100 in the vertical direction.

[0506] That is, the first wiring pattern Wpa can be electrically connected to a first terminal 1121 provided in at least one of the second coil plate portion 1200 and the second outer layer portion 1350, and can be electrically connected to the heating coil WC formed in the first coil plate portion 1100 through the first terminal 1121. Furthermore, the second wiring pattern Wpb can be electrically connected to a second terminal 1122 provided in at least one of the second coil plate portion 1200 and the second outer layer portion 1350, and can be electrically connected to the heating coil WC formed in the first coil plate portion 1100 through the second terminal 1122.

[0507] According to this embodiment, each sensing coil SC can be arranged at a position that overlaps with the second unpatterned region 1105 or the partition space in the vertical direction. Each such sensing coil SC can be arranged so that it does not overlap with the first terminal 1121 and the second terminal 1122 in the vertical direction, and can also be arranged so that it is not on the same straight line as the first terminal 1121 and the second terminal 1122 in the second direction.

[0508] That is, in each of the coil modules 1001 and 1003, a pair of sensing coils SC can be arranged to be spaced apart from each other along a first direction, and a second terminal 1122 is inserted between the pair of sensing coils SC. For example, a second wiring pattern Wpb can extend from the second connector 1023 in a second direction and can extend from the second connector 1023 in the second direction through the path between the pair of sensing coils SC.

[0509] Furthermore, at least one of the second coil plate portion 1200 and the second outer layer portion 1350 may also include a third wiring pattern Wpc. The third wiring pattern Wpc may be formed in each of the second coil plate portion 1200 and the second outer layer portion 1350, or it may be formed only in the second outer layer portion 1350. The third wiring pattern Wpc is provided to electrically connect the heating coil SC and the third connector 1025.

[0510] As described above, the plurality of heating coils WC and sensing coils SC disposed in coil modules 1001 and 1003 can be connected to connector 1020 through wiring patterns Wpa, Wpb and Wpc in coil modules 1001 and 1003, and can be connected to electrical component section 170 through connector 1020 (see FIG4).

[0511] That is, the wiring for connecting the heating coil WC and the sensing coil SC to the connector 1020 is formed in a patterned form in the coil modules 1001 and 1003 themselves, and the connection between the heating coil WC and the sensing coil SC and the electrical component 170 can be achieved solely through the connection between the connector 1020 and the electrical component 170.

[0512] Accordingly, the heating coil WC and the sensing coil SC can be easily and simply connected to the electrical component 170 by connecting the connector 1020 and the electrical component 170, and the connection structure between the heating coil WC and the sensing coil SC and the electrical component 170 can be formed very simply.

[0513] Furthermore, since there is no need for separate wiring operations to connect the heating coil WC and the sensing coil SC to the electrical component section 170, the connection operation between the heating coil assembly 1000 and the electrical component section 170 can be performed easily and quickly, and the storage space within the stove 100 that houses the heating coil assembly 1000 and the electrical component section 170 will not become complicated due to a large amount of wiring.

[0514] [Structure of masks and dummy vias]

[0515] Figure 49 is a diagram showing the state in which the heating coil assembly is covered by a mask, and Figure 50 is a cross-sectional view schematically showing an example of the stacked structure of the heating coil assembly shown in Figure 49. Furthermore, Figure 51 is a cross-sectional view schematically showing the state in which the heating coil assembly is covered by a top plate, and Figure 52 is a cross-sectional view schematically showing another example of the stacked structure of the heating coil assembly shown in Figure 49.

[0516] Referring to Figures 44 and 49 to 51, the heating coil assembly 1000 according to this embodiment may further include a mask 1500. The mask 1500 is provided to cover the uppermost and lowermost outer surfaces of the coil plate stack 1010 in the vertical direction.

[0517] That is, a mask 1500 is provided to cover the upper and lower surfaces of coil modules 1001 and 1003. The mask 1500 can form the surfaces of coil modules 1001 and 1003 and can form a heat-resistant coating that protects various patterns (e.g., coil pattern Cp, wiring patterns Wpa and Lpb) and vias V arranged on the upper and lower surfaces of coil modules 1001 and 1003.

[0518] For example, mask 1500 may cover patterns or vias V arranged on the outermost surface of coil plate stack 1010, and may form protrusions and recesses having shapes corresponding to the patterns or vias V. That is, the upper and lower surfaces of coil modules 1001 and 1003 formed by mask 1500 may include protrusions and recesses having shapes corresponding to the shapes of patterns or vias V arranged on the outermost surface of coil plate stack 1010.

[0519] The mask 1500 described above is provided to cover the upper and lower surfaces of the coil modules 1001 and 1003, such that the various patterns provided on the upper and lower surfaces of the coil modules 1001 and 1003 are not exposed to the outside of the coil modules 1001 and 1003, thereby preventing solder from unnecessarily adhering to the circuit patterns formed on the coil modules 1001 and 1003 and protecting the surfaces of the coil modules 1001 and 1003.

[0520] The mask 1500 can be formed from solder resist printed on the uppermost and lowermost outer surfaces of the coil board stack 1010 in the vertical direction. For example, the mask 1500 can be formed by UV curing photosensitive solder resist ink printed on the upper and lower surfaces of the coil modules 1001 and 1003.

[0521] According to this embodiment, the top plate 120 can be arranged on the outer side of the coil modules 1001 and 1003 in the vertical direction. That is, the coil modules 1001 and 1003 can be covered by the top plate 120 disposed above the coil modules 1001 and 1003. For example, the top plate 120 can be formed of a transparent or translucent material capable of transmitting light, such as glass or acrylic resin.

[0522] On one surface of the top plate 120 in the vertical direction, a cover portion 123 may be formed to cover the mask 1500 from the outside in the vertical direction. For example, the cover portion 123 may be formed on the lower surface of the top plate 120, and the cover portion 123 may cover the mask 1500 from above. For example, the cover portion 123 may be a printed layer or coating formed on the lower surface of the top plate 120 facing the mask 1500.

[0523] According to this embodiment, a light display area 121 is formed in the top plate 120, and a cover portion 123 may be provided in an area where the light display area 121 is not provided. For example, the cover portion 123 may be formed in most of the area of ​​the top plate 120, and the light display area 121 may be formed only in a portion of the area used to illuminate the upper part of the top plate 120 with light emitted from the lighting module 180.

[0524] Therefore, the light display area 121 can be formed to have a higher transparency than the cover portion 123. For example, the cover portion 123 can be formed to be almost opaque, with almost no light transmission. For example, the cover portion 123 can be formed to be a low-brightness color with a grayscale value of 0 to 3. For example, the cover portion 123 can be formed to be achromatic, more specifically, black.

[0525] The mask 1500 can be formed in a color similar to that of the cover 123. That is, the mask 1500 can be formed in a color that is not easily distinguishable from the color of the cover 123. For example, the mask 1500 can be formed in the same color as the cover 123.

[0526] For example, mask 1500 can be formed as a low-brightness color with a grayscale brightness value of 0 to 3. For example, cover portion 123 can be formed as a low-brightness color, and mask 1500 can also be formed as the same or similar low-brightness color.

[0527] In this embodiment, the mask 1500 is exemplified as being formed in a non-color. Accordingly, the cover portion 123 can be formed in a non-color, and the mask 1500 can also be formed in a non-color.

[0528] For example, the mask 1500 can be formed in black. Accordingly, the cover 123 can be formed in black, and the mask 1500 can also be formed in black. As a result, the surfaces of the coil modules 1001 and 1003 can be formed in black that is the same as or similar to the color of the cover 123.

[0529] Because the surfaces of coil modules 1001 and 1003 are formed to be the same or similar in color to the cover 123, the heating coil assembly 1000 may not be easily seen from the outside of the cooktop 100. Furthermore, because the surfaces of coil modules 1001 and 1003 are formed to be a dark color such as black, the heating coil assembly 1000, located in the dark interior space of the cooktop 100, may not be easily detected.

[0530] That is, by using a mask 1500 formed in black, which is the same or similar in color to the cover 123, the heating coil assembly 1000 can be installed inside the stove 100, so that it is not easily seen from the outside of the stove 100, thereby effectively suppressing the deterioration of the aesthetics of the cooking appliance caused by the heating coil assembly 1000.

[0531] For example, the mask 1500 can be formed before the via V is formed. That is, the via V can be formed after the mask 1500 is first formed on the upper outer surface of the coil plate stack 1010 in the vertical direction. In this case, at least a portion of the via V can be exposed outside the mask 1500. For example, one end of the via V, such as the platform portion Vc, can be exposed outside the coil plate stack 1010 covering the mask 1500.

[0532] As another example, as shown in Figure 52, the via V can be formed before the mask 1500 is formed. That is, the mask 1500 can be formed after the via V is formed first. In this case, the via V can be provided in a state covered by the mask 1500.

[0533] Additionally, referring to Figures 21 and 52, the coil module may also include a dummy via DV. The dummy via DV may be disposed in the unpatterned areas 1103 and 1105, and may be formed in the form of a hole that penetrates the coil plate stack 1010 in the vertical direction.

[0534] For example, a dummy via DV can be provided in a form similar to a via V (see Figure 50). For example, a dummy via DV can be formed in a form that includes a hole portion Va (see Figure 50), an inner wall portion Vb (see Figure 50), and a platform portion Vc (see Figure 50).

[0535] Furthermore, dummy vias (DVs) can be formed electrically isolated from various circuit patterns (such as the coil pattern Cp forming the heating coil WC or the sensing coil SC, and the wiring patterns Wpa, Wpb, and Wpc). Such dummy vias (DVs) do not serve as power or signal transmission devices, but can instead serve as heat dissipation devices for the coil module.

[0536] The dummy via DV can be arranged in the unpatterned areas 1103 and 1105, and can therefore be arranged to form the coil pattern Cp of the heating coil WC or the sensing coil SC without contact or overlapping in the vertical direction.

[0537] For example, multiple dummy vias (DVs) can be arranged in the first unpatterned region 1103 and the second unpatterned region 1105, respectively, and the dummy vias (DVs) can be arranged to not contact or overlap in the vertical direction, not only with coil patterns (Cp) but also with various circuit patterns such as wiring patterns (Wpa, Wpb, and Wpc).

[0538] The dummy via DV provided in this way can improve the heat dissipation performance of the coil module without interfering with the power or signal transmission of various circuit patterns formed in the coil module.

[0539] For example, the formation of a dummy via (DV) can be performed after the formation of the mask 1500. For instance, the formation of the via V can be performed before the formation of the mask 1500, and the formation of the dummy via DV can be performed after the formation of the mask 1500. In this case, the via V can be covered by the mask 1500, and the dummy via DV can be exposed outside the mask 1500. At this time, the conductors of the inner wall portion and the platform portion of the dummy via DV can be exposed outside the mask 1500 through the upper end of the dummy via DV.

[0540] In this configuration, the stability of the via V connected to the heating coil WC, etc., can be improved, and in addition, the dummy via DV can provide further improved heat dissipation performance.

[0541] As another example, for process convenience, the formation of via V and dummy via DV can both be performed after the formation of mask 1500. As yet another example, the formation of mask 1500 can be performed after both via V and dummy via DV are formed.

[0542] [Method for manufacturing coil board stacks]

[0543] Figure 53 is a flowchart schematically illustrating the manufacturing process of a coil plate stack according to an embodiment of the present disclosure, and Figure 54 is a flowchart schematically illustrating the progress of the connection step shown in Figure 53.

[0544] As described above, the heating coil assembly 1000 can be formed by stacking the first coil plate portion 1100, the second coil plate portion 1200, etc., in a vertical direction. The heating coil assembly 1000 includes a heating coil WC and a sensing coil SC. The heating coil WC can be formed by connecting a plurality of first coil portions 1120 respectively disposed in the first coil plate portion 1100 in a vertical direction, and the sensing coil SC can be formed by at least one second coil portion 1220 disposed in the second coil plate portion 1200.

[0545] In order to manufacture the heating coil assembly 1000 as described above, as shown in Figures 50 and 53, the step of forming coil portions 1120 and 1220 in each of the coil plate portions 1100 and 1200 (coil forming step S10) can be performed first.

[0546] In the coil forming step S10, a plurality of first coil portions 1120 can be formed in each of the first coil plate portions 1100, and a plurality of second coil portions 1220 can be formed in each of the second coil plate portions 1200. Furthermore, the first coil portions 1120 can be formed on the upper and lower surfaces of the first coil plate portions 1100, and the second coil portions 1220 can be formed on the upper and lower surfaces of the second coil plate portions 1200.

[0547] For example, coil portions 1100 and 1200 can be formed from a copper-clad laminate including cores 1110 and 1210 and copper foil stacked on both sides of cores 1110 and 1210 in the vertical direction. In this case, the individual coil patterns Cp forming coil portions 1120 and 1220 can be formed by patterning the foil stacked on cores 1110 and 1210 into a coil shape.

[0548] For example, the formation of a coil pattern Cp can be performed by sequentially including processes of dry film attachment, exposure, development, and etching.

[0549] For example, after the dry film is attached to the copper-clad laminate, when ultraviolet light is irradiated onto the dry film, a portion of the photoresist in the UV-irradiated dry film is cured (exposed). During the development process, the uncured portions of the photoresist are removed, and when the foil at the portion where the photoresist has been removed is removed by etching, the coil pattern Cp can be formed in the coil board portions 1100 and 1200.

[0550] When the coil pattern Cp and the coil portions 1120 and 1220 including the coil pattern Cp are formed in each of the coil plate portions 1100 and 1200 as described above, the coil plate stack 1010 can be formed by stacking multiple coil plate portions 1100 and 1200 in the vertical direction (stack step S20).

[0551] In the stacking step S20, coil plates 1100 and 1200 and adhesive material 1400 can be stacked in the vertical direction. At this time, the coil plates 1100 and 1200 and adhesive material 1400 can be stacked such that the coil plates 1100 and 1200 and adhesive material 1400 are alternately arranged in the vertical direction.

[0552] For example, the adhesive material 1400 may include at least one prepreg film F. For example, the adhesive material 1400 may be formed in the form in which a plurality of prepreg films are stacked in a vertical direction. That is, the adhesive material 1400 may be formed by stacking a plurality of prepreg films in a vertical direction, and the adhesive material 1400 may be located between the coil plate portions 1100 and 1200 stacked in a vertical direction.

[0553] When the coil plates 1100 and 1200 stacked vertically as described above, along with the adhesive material 1400, are heated and pressed, the adhesive material 1400 located between the coil plates 1100 and 1200 stacked vertically can be melted and then cured to bond the coil plates 1100 and 1200 together. Therefore, multiple coil plates 1100 and 1200 and adhesive materials 1400 can be integrated, resulting in a coil plate stack 1010 having multiple layers of coil portions 1120 and 1220.

[0554] In the coil plate stack 1010 formed as described above, the coil portions 1120 and 1220 and the insulating layer can be arranged alternately in the vertical direction. Accordingly, the insulating layer can be formed by cores 1110 and 1210 arranged between a pair of coil portions 1120 and 1220 in each of the coil plate portions 1100 and 1200, and the insulating layer can also be formed by adhesive material 1400 arranged between the coil plate portions 1100 and 1200.

[0555] For example, the thickness of each coil portion in coil portions 1120 and 1220 can be set to 0.10 mm to 0.11 mm, and the thickness of each prepreg film disposed between a pair of coil portions 1120 and 1220 arranged in a vertical direction can be set to 0.05 mm to 0.09 mm. Furthermore, each adhesive material 1400 disposed between a pair of coil portions 1120 and 1220 arranged in a vertical direction can be formed from three prepreg films F stacked in a vertical direction.

[0556] For example, the thickness of each prepreg film F can be set to 0.06 mm to 0.08 mm, and each adhesive material 1400 can be formed from three prepreg films F.

[0557] As another example, the thickness of each prepreg film F can be set to 0.07 mm to 0.09 mm. In addition, each adhesive material 1400 disposed between a pair of coil portions 1120 and 1220 arranged in the vertical direction can be formed by four prepreg films F stacked in the vertical direction.

[0558] The adhesive materials 1400 formed in the manner described above can effectively fill the spaces formed in the coil plates 1100 and 1200 by removing the foil through etching, and can join the coil plates 1100 and 1200 together.

[0559] Furthermore, in the stacking step S20, not only the multiple coil plate portions 1100 and 1200, but also a pair of outer layer portions 1300 and 1350 can be stacked together. That is, the multiple coil plate portions 1100 and 1200 and a pair of outer layer portions 1300 and 1350 can be stacked together, such that the multiple coil plate portions 1100 and 1200 are disposed between the pair of outer layer portions 1300 and 1350. Therefore, these outer layer portions 1300 and 1350 can form the upper and lower ends of the coil plate stack 1010.

[0560] The outer layers 1300 and 1350 can be bonded to the coil plates 1100 and 1200 using an adhesive material 1400 disposed between the outer layers 1300 and 1350 and the coil plates 1100 and 1200. The adhesive material 1400 can form an insulating layer between the coil portions 1120 and 1220 and the outer layers 1300 and 1350, and can connect the coil plate stack 1010 to the outer layers 1300 and 1350.

[0561] With the coil plate stack 1010 formed as described above, the outer layers 1300 and 1350 can be formed on the outer side of the coil plate stack 1010 in the vertical direction (outer coil forming step S30). In the outer coil forming step S30, the operation of forming the outer layers 1300 and 1350 by processing the foil into a coil shape can be performed.

[0562] Similar to the formation of coil portions 1120 and 1220, the formation of outer layers 1300 and 1350 can be performed by a sequence of steps including dry film attachment, exposure, development and etching, and a detailed description thereof will be omitted.

[0563] For example, when the coil plate stack 1010 is formed in such a way that the second coil portion 1220 is stacked on top of a plurality of first coil portions 1120, the outer layer portions 1300 and 1350 arranged on the second coil plate portion 1200 can be formed in the same form as the second coil portion 1220 to form a sensing coil SC together with the second coil portion 1220, and the outer layer portions 1300 and 1350 arranged below the first coil plate portion 1100 can be formed in the same form as the first coil portion 1120 to form a heating coil WC together with the first coil portion 1120.

[0564] After the coil plate stack 1010 is formed as described above, multiple coil portions 1120 and 1220 stacked in the vertical direction can be connected in the vertical direction (connection step S40).

[0565] In the connection step S40, as shown in Figures 50 and 54, the operation of forming holes Va that connect to the multiple coil portions 1120 and 1220 stacked in the vertical direction can be performed first (drilling step S41). Each hole Va can be formed in the form of a hole penetrating the coil plate stack 1010 in the vertical direction, and the formation of the hole Va can be performed by drilling the coil plate stack 1010 in the vertical direction to process the hole.

[0566] After forming the hole Va, a through hole V can be formed in the hole Va formed as described above, and multiple coil portions 1120 and 1220 can be connected in the vertical direction through the through hole V (through hole forming step S43).

[0567] For example, multiple first coil portions 1120 can be connected in the vertical direction via a first vertical connecting portion 1030 formed by a through-hole V to form a heating coil WC. Furthermore, multiple second coil portions 1220 can be connected in the vertical direction via a second vertical connecting portion 1040 formed by a through-hole V to form a sensing coil SC.

[0568] Each via V can be formed to include an inner wall portion Vb and a platform portion Vc. For example, the inner wall portion Vb can be formed by electroplating a conductive metal (e.g., copper foil) on the inner wall of each coil plate portion 1100 and 1200 surrounding the via portion Va, and the platform portion Vc can be formed by electroplating copper foil on the upper and lower surfaces of the coil plate portions 1100 and 1200 to connect to the inner wall portion Vb.

[0569] After the heating coil WC and sensing coil SC are formed as described above, a mask 1500 can be formed on the outer side of the coil plate stack 1010 in the vertical direction (mask formation step S50).

[0570] In the mask forming step S50, a mask 1500 may be set to cover the upper and lower surfaces of coil modules 1001 and 1003. The mask 1500 may be formed with a heat-resistant coating that protects various circuit patterns disposed on the upper and lower surfaces of coil modules 1001 and 1003.

[0571] As another example, as shown in Figure 52, the formation of the mask 1500 can be performed after the via V is formed first. In this case, the via V can be provided in a state covered by the mask 1500.

[0572] As another example, a via V can be formed before the mask 1500 is formed, and a dummy via DV can be formed after the mask 1500 is formed (see Figure 21). In this case, the via V can be covered by the mask 1500, and the dummy via DV can be exposed outside the mask 1500. At this time, the conductors of the inner wall portion and the platform portion of the dummy via DV can be exposed outside the mask 1500 through the upper end of the dummy via DV.

[0573] As another example, the formation of via V and the formation of dummy via DV can both be performed after the formation of mask 1500, or the formation of mask 1500 can be performed after the formation of via V and dummy via DV.

[0574] [Example of a heating coil assembly]

[0575] Figure 55 is a diagram illustrating an example of a heating coil assembly according to an embodiment of the present disclosure; Figure 56 is a diagram illustrating a first coil module shown in Figure 55 in a separated state; and Figure 57 is a diagram illustrating a second coil module shown in Figure 55 in a separated state. Furthermore, Figure 58 is a diagram illustrating the heating coil shown in Figure 55 in a separated state; and Figure 59 is a cross-sectional view schematically illustrating an example of the per-turn arrangement structure of the first coil portion. Additionally, Figure 60 is a cross-sectional view schematically illustrating another example of the per-turn arrangement structure of the first coil portion; and Figure 61 is a cross-sectional view showing an enlarged view of the stacked structure of the heating coil assembly.

[0576] In the following text, an example of a heating coil assembly will be described with reference to Figures 55 to 60.

[0577] Referring to Figures 55 to 57, the heating coil assembly 1000 according to this embodiment may include a plurality of coil modules 1001 and 1003. In this embodiment, a pair of first coil modules 1001 and a second coil module 1003 are shown arranged along a first direction.

[0578] Each of the first coil module 1001 and the second coil module 1003 may include a plurality of heating coils WC. For example, each of the first coil modules 1001 may include eight heating coils WC arranged in a 2-column × 4-row configuration, and the second coil module 1003 may include six heating coils WC arranged in a 2-column × 3-row configuration. Therefore, the heating coil assembly 1000 may include a total of 22 heating coils WC.

[0579] For example, the heating coil assembly 1000 can be formed as a polygon with a length a1 of 920 mm to 940 mm in a first direction and a length b1 of 525 mm to 545 mm in a second direction. The first coil module 1001 forming the heating coil assembly 1000 can be formed as a rectangle with a length a2 of 245 mm to 255 mm in the first direction and a length b2 of 400 mm to 410 mm in the second direction. The second coil module 1003 can be formed as a rectangle with a length a3 of 245 mm to 255 mm in the first direction and a length b3 of 300 mm to 310 mm in the second direction.

[0580] Referring to Figure 58, each heating coil WC disposed in coil modules 1001 and 1003 can be formed into a generally rectangular spiral shape. The external shape of each heating coil WC can be generally rectangular.

[0581] For example, the external shape of the heating coil WC can be a rectangle with rounded corners. In a heating coil WC with this shape, the orientation-changing portion of the coil pattern Cp can be formed into a curved shape. That is, the straight portions of the coil pattern Cp extending in the left-right direction and the straight portions extending in the front-back direction can be smoothly connected to each other through the curved portions.

[0582] Furthermore, when the corners of the heating coil WC are rounded, the change in the cross-sectional area of ​​the heating coil WC becomes more gradual than when the corners are angled, and therefore, the resistance of the heating coil WC can be reduced. That is, a heating coil WC with rounded corners can generate less heat than a heating coil with angular corners.

[0583] As another example, the external shape of the heating coil WC can be a rectangle with angular corners. In this case, the length of the spiral formed by the heating coil WC can be increased, and therefore, the pattern cross-sectional area per turn of the heating coil WC can be increased.

[0584] In this embodiment, the external shape of the heating coil WC is shown as a rectangle having a first direction length different from the second direction length. As another example, the external shape of the heating coil WC can be a square. The advantage of forming the heating coil WC in this way is that it facilitates the design and production of the heating coil WC.

[0585] The external shape of each heating coil WC can be a rectangle with a length b4 of 60 mm to 120 mm and a width a4 of 80 mm to 130 mm. That is, the external shape of each heating coil WC can be a rectangle with a first directional length a4 of 80 mm to 130 mm and a second directional length b4 of 60 mm to 120 mm.

[0586] For example, the external shape of each heating coil WC can be a rectangle having a first directional length of 95 mm to 125 mm and a second directional length of 90 mm to 110 mm. Such a heating coil WC can be formed by winding a coil pattern Cp around a first unpatterned region 1103 nine or more turns. For example, the heating coil WC can be formed by winding a coil pattern Cp around a first unpatterned region 1103 nine to eleven turns.

[0587] In this case, as shown in Figures 50, 58, and 59, the width w of each coil pattern Cp can be from 0.2 mm to 0.4 mm. Furthermore, the spacing d between adjacent coil patterns Cp can be from 0.2 mm to 0.4 mm.

[0588] In these coil modules 1001 and 1003, a plurality of first coil plates 1100 can be stacked vertically, such that the first coil portions 1120 are arranged vertically. In this embodiment, the first coil portions 1120 are arranged in 10 or more layers vertically, for example. For example, the first coil portions 1120 can be stacked in 10 to 12 layers vertically.

[0589] However, this disclosure is not limited thereto, and the number of stacked layers of the first coil portion 1120 may be set to more than twelve layers depending on design conditions such as product thickness, required power, heat generation, etc.

[0590] According to this embodiment, 10 to 12 first coil portions 1120 arranged on the same straight line in the vertical direction can be connected in the vertical direction to form a heating coil WC. For this purpose, multiple coil patterns Cp arranged on the same straight line in the vertical direction can be connected together in the vertical direction.

[0591] More specifically, the external shape of each heating coil WC can be a rectangle having a first directional length of 100 mm to 125 mm and a second directional length of 85 mm to 95 mm. Such a heating coil WC can be formed by winding a coil pattern Cp around a first unpatterned region 1103 nine or more turns.

[0592] For example, the coil pattern Cp may be wound around the first unpatterned region 1103 9 to 11 turns, and the outer shape of the heating coil WC may be a rectangle with a first directional length of 100 mm to 110 mm and a second directional length of 88 mm to 100 mm. As another example, the outer shape of the heating coil WC may be a rectangle with a first directional length of 115 mm to 125 mm and a second directional length of 88 mm to 100 mm.

[0593] In this case, the width w of each coil pattern Cp can be from 0.25 mm to 0.35 mm. Furthermore, the spacing d between adjacent coil patterns Cp can be from 0.25 mm to 0.35 mm. In such coil modules 1001 and 1003, a plurality of first coil plates 1100 can be stacked vertically, such that the first coil portions 1120 are arranged in ten layers along the vertical direction.

[0594] In this configuration, ten first coil portions 1120 arranged in a straight line along the vertical direction can be connected vertically to form a heating coil WC. For this purpose, multiple coil patterns Cp arranged in a straight line along the vertical direction can be connected vertically.

[0595] As described above, each heating coil WC can be formed by winding a coil pattern Cp around the first unpatterned region 1103 nine to eleven turns, more specifically eleven turns. Furthermore, each heating coil WC may include three to six coil patterns Cp arranged in each layer. Here, the term "turn" refers to the number of times the coil pattern Cp is wound, and can also be expressed as "loop" or "cycle". For example, "11 turns" can alternatively be expressed as "11 loops" or "11 cycles".

[0596] When each heating coil WC is cut in the vertical direction and the vertical cross-section of the heating coil WC is observed, the multiple coil patterns Cp included in the heating coil WC can be divided into multiple unit cells along the radial direction of the spiral formed by the heating coil WC (hereinafter referred to as the "radial direction").

[0597] In this case, each unit body can be defined with reference to the dividing region 1120a. For example, when each first coil portion 1120 includes four coil patterns Cp, each dividing region 1120a may include four coil patterns Cp arranged along the diameter direction, and each unit body may include four columns of coil patterns Cp. Furthermore, when each heating coil WC includes 10 layers of coil patterns Cp, each unit body may include coil patterns Cp arranged in a 4-column × 10-row configuration.

[0598] For each unit cell, the sum of the vertical cross-sectional areas of the coil pattern Cp, that is, the pattern cross-sectional area of ​​each turn of the heating coil WC, can satisfy the following relationship.

[0599] 1≤S=I / D, 15≤D≤20, 15≤I≤20, D=P m n, where S represents the pattern cross-sectional area (mm²) of each turn of the heating coil. 2I represents the current flowing through the heating coil at maximum output, and D represents the current density (A / mm²) of the current flowing through the heating coil at maximum output. 2 P represents the cross-sectional area (mm²) of each coil pattern. 2 ), m represents the number of coil sections stacked in each heating coil, and n represents the number of coil patterns in each coil section.

[0600] According to this embodiment, the cross-sectional area S of each turn of the heating coil WC is set such that the current density D (hereinafter referred to as "current density") of the current flowing through the heating coil WC at the maximum output of the stove 100 is 15 A / mm². 2 Up to 20 A / mm 2 Within the range of.

[0601] For example, when the maximum output of a cooktop 100 including 22 heating coils WC is 3.6 kW, and the current I flowing through each heating coil WC is 15 A to 20 A, the cross-sectional area S of each turn of the heating coil WC can be set such that the current density D is 15 A / mm². 2 Up to 20 A / mm 2 Within the range of.

[0602] By satisfying these conditions regarding the cross-sectional area S of each turn of the heating coil WC, the frequency of the current flowing through each heating coil WC can be kept at a low level. When the frequency of the current flowing through the heating coil WC can be kept at a low level, the temperature rise of the heating coil WC can be effectively suppressed.

[0603] For example, when the cross-sectional area S of the pattern per turn of the heating coil WC is set as described above, such that the current density D is 15 A / mm², 2 Up to 20 A / mm 2 Within the specified range, the frequency of the current flowing through the heating coil WC can be maintained below 90 kHz, and therefore, even when the heating coil WC operates continuously for more than 10 minutes, the temperature of the heating coil WC can be maintained below 150°C.

[0604] Based on the results of the water boiling test, a cooking appliance can be evaluated as having relatively excellent conditions in the water boiling test when it boils 6 liters of water within 11 minutes. That is, in order for the cooking appliance of this embodiment to provide performance sufficient to obtain an excellent rating in the water boiling test, the heating coil WC needs to be able to operate continuously for approximately 9 to 11 minutes at maximum output.

[0605] Furthermore, in this embodiment, a printed circuit board forming the heating coil assembly 1000 or the heating coil assembly 1000 as a whole is provided exemplary to identify heat resistance at 150°C based on the North American Relative Thermal Index (RTI) standard.

[0606] Therefore, when the temperature of the heating coil WC can be maintained below 150°C, or even when the heating coil WC operates continuously for more than 10 minutes, the stability standards of the printed circuit board and the performance conditions of the water boiling test can be met.

[0607] That is, even when the heating coil WC operates continuously for more than 10 minutes, the cooking appliance of this embodiment can provide excellent heating performance by keeping the temperature of the heating coil WC below 150°C, while effectively meeting the standards related to the heating coil assembly 1000.

[0608] According to this embodiment, a coil wire 1123 or 1124 may be formed by a group of multiple coil patterns Cp arranged along the diameter direction. A coil wire 1123 or 1124 may be wound multiple times to form a first coil portion 1120, and the first coil portion 1120 may be connected in the vertical direction to form a heating coil WC.

[0609] Furthermore, each coil line 1123 or 1124 forming the first coil portion 1120 forms a horizontal twisted structure within the first coil portion 1120, and the multiple coil lines 1123 or 1124 stacked in the vertical direction form a vertical twisted structure, such that the multiple coil patterns Cp forming the heating coil WC can form a braided twisted structure.

[0610] That is, the heating coil WC can be formed by forming horizontal and vertical twisted structures from multiple coil patterns Cp and connecting them in the vertical direction. Therefore, the total area of ​​the metal foil of each heating coil WC is not a value obtained by summing the areas of the metal foil of the layer forming the coil portion 1120 or 1220, but a value obtained by summing the areas of the metal foil of the multiple coil portions 1120 and 1220 connected in the vertical direction.

[0611] The current density D of the heating coil WC and the pattern cross-sectional area S per turn are inversely proportional. Therefore, to reduce the current density D, it is necessary to increase the pattern cross-sectional area S per turn of the heating coil WC.

[0612] With this in mind, in this embodiment, the heating coil WC is formed by connecting multiple coil lines 1123 and 1124 stacked in the vertical direction in the vertical direction, and a horizontal twist structure and a vertical twist structure are formed in the heating coil WC, thereby increasing the pattern cross-sectional area S of each turn of the heating coil WC.

[0613] The heating coil WC formed in this way can increase the cross-sectional area S of the pattern per turn of the heating coil WC, while minimizing the increase in the horizontal size of the heating coil WC. With the help of such a heating coil WC, it is possible to effectively reduce the current density D flowing through the heating coil WC while reducing the size of the heating coil WC.

[0614] Because the size of the heating coils WC can be reduced, the stove 100 of this embodiment can include a greater number of heating coils WC than other stoves with the same standard. That is, in the stove 100 of this embodiment, heating coils WC, which are smaller than those in the prior art, can be arranged more densely.

[0615] Furthermore, because the current density D flowing through the heating coil WC can be reduced, the temperature rise of the heating coil WC can be suppressed more effectively. Therefore, compared with other cooktops with the same standards, the maximum output can be maintained for a longer period of time.

[0616] That is, the cooking appliance according to this embodiment can provide further improved heating efficiency by using small and densely arranged heating coils WC, and can also provide higher output over a longer period of time.

[0617] The pattern cross-sectional area S of each turn of the heating coil WC is set such that the current density is 15 A / mm². 2 Up to 20A / mm 2 For example, the thickness t of the coil pattern Cp can be from 0.08 mm to 0.12 mm, the width w of the coil pattern Cp can be from 0.25 mm to 0.35 mm, and the spacing d between multiple coil patterns Cp can be set from 0.25 mm to 0.40 mm.

[0618] The pattern cross-sectional area S of each turn of the heating coil WC is set such that the current density is 15 A / mm². 2 Up to 20A / mm 2 In another example within the range, the thickness t of the coil pattern Cp can be from 0.085 mm to 0.110 mm, the width w of the coil pattern Cp can be from 0.28 mm to 0.32 mm, and the spacing d between multiple coil patterns Cp can be set from 0.30 mm to 0.35 mm.

[0619] In this embodiment, each coil pattern Cp is shown as being formed in a generally rectangular shape. That is, the values ​​associated with the coil pattern Cp are set assuming that the coil pattern Cp is formed in a rectangular shape.

[0620] More specifically, the thickness t of the coil pattern Cp can be from 0.10 mm to 0.11 mm, the width w of the coil pattern Cp can be from 0.28 mm to 0.32 mm, and the spacing d between multiple coil patterns Cp can be set from 0.30 mm to 0.35 mm. Additionally, the interlayer spacing between the coil patterns Cp can be set from 0.10 mm to 0.21 mm.

[0621] In this configuration, the heating coil assembly 1000 may include a total of 22 heating coils WC, and the external shape of each heating coil WC may be rectangular, having a first direction length of 100 mm to 125 mm and a second direction length of 85 mm to 95 mm. Furthermore, each heating coil WC may include 10 or more layers of coil patterns Cp, and may be formed as a result of each coil pattern Cp being wound around the first unpatterned region 1103 nine or more times. As an example, each heating coil WC may include 10 layers of coil patterns Cp, and each coil pattern Cp may be wound around the first unpatterned region 1103 nine to eleven times.

[0622] Furthermore, each heating coil WC may include three or four coil patterns Cp per layer. For example, when each heating coil WC includes 10 layers of coil patterns Cp, four coil patterns Cp may be arranged in one of the upper five layers and the lower five layers of the heating coil WC, and three coil patterns Cp may be arranged in another layer.

[0623] For example, four coil patterns Cp can be arranged in the upper five layers of the heating coil WC, and three coil patterns Cp can be arranged in the lower five layers of the heating coil WC. In this case, each heating coil WC can include a total of 35 coil patterns Cp.

[0624] In the heating coil WC with the above structure, the coil patterns Cp of the upper five layers and the coil patterns Cp of the lower five layers can be arranged so that they do not overlap in the vertical direction. That is, the upper coil patterns Cp and the lower coil patterns Cp can be arranged in an alternating manner.

[0625] In this case, the electromagnetic generation positions of the coil pattern Cp in the upper layer and the coil pattern Cp in the lower layer can be staggered in the horizontal direction, thereby suppressing electromagnetic interference in the heating coil WC.

[0626] As another example, three coil patterns Cp can be arranged in the upper five layers of the heating coil WC, and four coil patterns Cp can be arranged in the lower five layers of the heating coil WC. In this case, each heating coil WC can also include a total of 35 coil patterns Cp.

[0627] As another example, as shown in Figure 60, four coil patterns Cp can be arranged in each layer of the heating coil WC. In this case, the individual heating coils WC can include a total of 40 coil patterns Cp.

[0628] That is, when four coil patterns Cp are provided in each layer of the heating coil WC, the number of coil patterns Cp included in the heating coil WC can be increased compared to the case where the number of coil patterns Cp in each layer is different. Since the number of coil patterns Cp can be increased in this way, the pattern cross-sectional area per turn of the heating coil WC can be increased, and therefore, the frequency of the current flowing through the heating coil WC can be kept at a low level, thereby effectively suppressing the temperature increase of the heating coil WC.

[0629] The coil modules 1001 and 1003 described above can be formed as a structure in which four to six coil plate portions 1100 and 1200 and one outer layer portion 1300 and 1350 are stacked in the vertical direction. The length of the coil modules 1001 and 1003 in the vertical direction, i.e., their thickness, can be set in the range of 3.2 mm to 3.8 mm.

[0630] As an example, coil modules 1001 and 1003 can be formed as a structure in which one first outer layer portion 1300, three first coil plate portions 1100, one second coil plate portion 1200, and one second outer layer portion 1350 are stacked in the vertical direction. That is, coil modules 1001 and 1003 can be formed to include 10 layers of coil portions 1120 and 1220. The thickness of coil modules 1001 and 1003 can be set in the range of 3.2 mm to 3.4 mm.

[0631] As described above, each of the coil plates 1100 and 1200 may include a core 1110 or 1210 and a coil portion 1120 or 1220, and the plurality of coil plates 1100 and 1200 may be connected to each other by an adhesive material 1400.

[0632] In this case, the thickness of the adhesive material 1400 can be set to be greater than the thickness of the cores 1110 and 1210. Furthermore, the thickness of the adhesive material 1400 can be set to be greater than the thickness of the coil portions 1120 and 1220. For example, the thickness of the adhesive material 1400 can be set to be at least twice the thickness of the coil portions 1120 and 1220.

[0633] Additionally, in Figures 59 and 60, for ease of description, the vertical cross-sectional shape of the coil pattern Cp is shown as a rectangle; however, the actual vertical cross-sectional shape of the coil pattern Cp can be a polygon with bottom and top sides of different lengths, such as a trapezoid. Furthermore, in the actual vertical cross-section of the coil pattern Cp, the sides may not be formed as vertical straight lines, but rather as inclined straight lines or curved shapes.

[0634] As an example, as shown in Figures 56 and 61, the thickness of each core 1110 and 1210 can be from 0.09 mm to 0.11 mm, the thickness of each coil portion 1120 and 1220 can be from 0.10 mm to 0.11 mm, and the thickness of each adhesive material 1400 can be from 0.28 mm to 0.36 mm.

[0635] Here, the thickness of the adhesive material 1400 refers to the thickness of the adhesive material 1400 before it is inserted between the coil plate portions 1100 and 1200. After the adhesive material 1400 is inserted between the coil plate portions 1100 and 1200 to connect the coil plate portions 1100 and 1200, the thickness of the adhesive material 1400 can be reduced compared to the thickness before insertion.

[0636] As an example, the thickness of each core in cores 1110 and 1210 can be from 0.10 mm to 0.11 mm, and the thickness of the adhesive material 1400 located between coil plate portions 1100 and 1200 can be from 0.18 mm to 0.21 mm. In this case, the interlayer spacing of the coil pattern Cp can be from 0.10 mm to 0.21 mm.

[0637] As described above, the thickness of coil modules 1001 and 1003, which include 10 coil layers 1120 and 1220, can be set to 3.2 mm to 3.4 mm. As another example, the thickness of coil modules 1001 and 1003, which are formed by stacking a first outer layer 1300, four first coil plate portions 1100, a second coil plate portion 1200, and a second outer layer portion 1350 in the vertical direction, i.e., the thickness of coil modules including 12 coil layers 1120 and 1220, can be set to the range of 3.6 mm to 3.8 mm.

[0638] In the coil modules 1001 and 1003 formed as described above, the diameter dm of each via V connecting the coil portions 1120 and 1220 in the vertical direction can be set to 0.40 mm or more. In this via V, the horizontal thickness wt of the inner wall portion Vb can be set to be less than the thickness t of the coil pattern Cp. That is, the inner wall portion Vb of each via V can be formed to have a thickness less than the thickness t of the coil pattern Cp.

[0639] As an example, each of the first vertical connecting portions 1030 may include a plurality of through holes V arranged along the circumferential direction of the spiral formed by the heating coil WC. Furthermore, the sum of the horizontal thicknesses wt of the inner wall portions Vb of the through holes V included in one of the first vertical connecting portions 1030 can be set to be greater than half the thickness t of a coil pattern Cp. For example, when two through holes V are provided in each of the first vertical connecting portions 1030, the horizontal thickness of the inner wall portion Vb of each through hole V can be set to be greater than one-quarter of the thickness t of a coil pattern Cp.

[0640] Therefore, a current path with sufficient width for current flow can be formed within each of the first vertical connecting portions 1030. By forming a current path with sufficient width for current flow in the first vertical connecting portions 1030 as described above, the current flow in the heating coil WC can be stably maintained, and the loss of current flowing through the heating coil WC can be effectively reduced.

[0641] According to this embodiment, as shown in Figures 29 and 61, vias V are arranged in the partition region 1120b. In each via V arranged as described above, the diameter of the platform portion Vc can be set in the range of 0.75 mm to 0.85 mm. This is a result of a design that takes into account the length of the partition region 1120b in the diametrical direction being set in the range of 1.05 mm to 1.15 mm. For example, the diameter of the platform portion Vc can be set to be shorter than the length of the partition region 1120b in the diametrical direction, while being long enough to stably connect to the coil pattern Cp.

[0642] In each vertical connecting part 1030, multiple through holes V can be arranged along the circumferential direction. That is, in each vertical connecting part 1030, multiple through holes V can be arranged in a line along the circumferential direction, rather than along the diametrical direction.

[0643] [Structure of coil patterns]

[0644] Figure 62 is a cross-sectional view showing the vertical cross-sectional shape of a patterned coil, Figure 63 is an enlarged view of the patterned coil shown in Figure 62, and Figure 64 is a table comparing a patterned coil according to an embodiment of the present disclosure with a comparative example. Figure 65 is an enlarged cross-sectional view showing the vertical cross-sectional shape of a patterned coil formed by etching, and Figure 66 is a cross-sectional view showing another example of a patterned coil formed by etching.

[0645] As shown in Figures 50 and 62 to 64, the heating coil WC can be formed by a plurality of first coil portions 1120 stacked in the vertical direction, and each first coil portion 1120 can include a plurality of coil patterns Cp arranged along the diametrical direction of the heating coil WC.

[0646] For example, each coil pattern Cp can be formed as a shape patterned in the form of a coil on the core 1110 of the first coil plate portion 1100.

[0647] As described above, the coil pattern Cp can be formed by a series of steps including dry film attachment, exposure, development, and etching. That is, the coil pattern Cp can be formed by etching the portion of the foil disposed on the core 1110 that has not been cured by exposure to remove that portion from the coil plate portions 1100 and 1200.

[0648] The vertical cross-section of each coil pattern Cp can be formed into a polygon shape, including a bottom edge Ca closest to the core 1110 and a top edge Cb spaced apart from the core 1110 by the thickness of the coil pattern Cp. In the coil pattern Cp, the length of the top edge Cb can be set to be less than the length of the bottom edge Ca.

[0649] Typically, during the formation of the coil pattern Cp as described above, a greater amount of foil is removed in the region adjacent to the top edge Cb than in the region adjacent to the bottom edge Ca. That is, as a result of the etching process used to form the coil pattern Cp, a significant amount of foil loss occurs in the region adjacent to the top edge Cb.

[0650] For example, during the process of removing a portion of the foil to form the coil pattern Cp, the amount of foil removed around the top edge Cb is greater than the amount of foil removed around the bottom edge Ca, causing the length of the top edge Cb to become shorter than the design value and smaller than the length of the bottom edge Ca.

[0651] For example, the vertical cross-section of the coil pattern Cp can be formed as a polygon, wherein the length of the top side Cb is 70% to 80% of the length of the bottom side Ca. In this embodiment, the vertical cross-section of the coil pattern Cp is shown as a polygonal shape that is close to a trapezoid, in which the bottom side Ca and the top side Cb are parallel to each other.

[0652] For example, the vertical cross-section of each coil pattern Cp can be formed as a polygonal shape including a pair of side sides ca and Ccb connecting the bottom edge Ca and the top edge Cb in the vertical direction. Each of the side sides ca and Ccb can include a first side side ca connected to the top edge Cb and a second side side cb connecting the first side side ca and the bottom edge Ca. That is, the second side side cb is arranged above the bottom edge Ca, and the first side side ca is arranged above the second side side cb.

[0653] For example, the first side ca can be formed as a vertical straight line. The second side ca can be formed as an inclined surface connecting the lower end of the first side ca and the bottom edge Ca.

[0654] The second side cb can be formed as an inclined surface, which slopes outward in the horizontal direction toward the bottom edge Ca as the second side cb approaches the bottom edge Ca in the vertical direction, i.e., toward the bottom edge. For example, the second side cb can be formed as a curved shape connecting the lower end of the first side ca and the bottom edge Ca. In this case, the second side cb can be formed as a concave shape toward the inner side of the coil pattern Cp in the horizontal direction and toward the lower side of the coil pattern Cp.

[0655] For example, the vertical cross-section of the coil pattern Cp can satisfy the following relationship: 1.47≤W1 / t≤1.57 (where W1 represents the length of the bottom edge of the coil pattern and t represents the thickness of the coil pattern).

[0656] According to this embodiment, the length W1 of the bottom edge Ca of the coil pattern Cp is set within the range of 1.47 to 1.57 times the thickness of the coil pattern Cp. By setting the length W1 of the bottom edge Ca of the coil pattern Cp to satisfy the above condition, even if the length of the top edge Cb becomes more than 20% shorter than the bottom edge Ca during the formation of the coil pattern Cp, the coil pattern Cp can still be formed, so that the cross-sectional area of ​​each coil pattern Cp is more than 90% of the design value.

[0657] For example, the width W of the coil pattern Cp can be set in the range of 0.3 mm to 0.6 mm. More specifically, the width W of the coil pattern Cp can be set in the range of 0.5 mm to 0.6 mm.

[0658] Referring to Figures 62 to 55, under the condition that each unit body of the heating coil WC, having a first direction length of 104 mm and a second direction length of 96 mm, includes 10 layers of first coil portions 1120 and the thickness of each coil pattern Cp is 0.105 mm, when the width of each coil pattern Cp and the spacing between coil patterns Cp are both 0.30 mm, the cross-sectional area S of each turn of the heating coil WC can be approximately 0.945 mm². 2 (Comparative Example). That is, according to the design values ​​of the comparative example, the cross-sectional area S of the pattern per turn of the heating coil WC can be approximately 0.945 mm². 2 .

[0659] In this case, each unit cell of the heating coil WC may include coil patterns Cp arranged in a three-column × ten-column configuration. That is, the number of coil patterns Cp per turn of the heating coil WC becomes approximately 30.

[0660] In the comparative example designed as described above, the actual heating coil WC can be formed in a trapezoidal shape, and the pattern cross-sectional area S of each turn of the trapezoidal heating coil WC can be approximately 0.827 mm².2 That is, the cross-sectional area S of each turn of the actual heating coil WC, which is formed in a trapezoidal shape, is only about 87.5% of the design value.

[0661] In contrast, under the same conditions as the heating coil WC of the comparative example—that is, when each unit of the heating coil WC, having a first direction length of 104 mm and a second direction length of 96 mm, comprises 10 layers of first coil portions 1120 and the thickness of each coil pattern Cp is 0.105 mm—when the width of each coil pattern Cp and the spacing between coil patterns Cp are both 0.53 mm, each unit of the heating coil WC can include coil patterns Cp arranged in a two-column × 10-row configuration. That is, the number of coil patterns Cp per turn of the heating coil WC becomes approximately 20.

[0662] In this embodiment, the pattern cross-sectional area S of each turn of the heating coil WC can be approximately 1.113 mm². 2 That is, according to the design values ​​of this embodiment, the cross-sectional area S of the pattern per turn of the heating coil WC can be approximately 1.113 mm². 2 .

[0663] In the embodiment designed as described above, the actual heating coil WC can be formed in a trapezoidal shape, and the pattern cross-sectional area S of each turn of the trapezoidal heating coil WC can be approximately 1.030 mm². 2 That is, the cross-sectional area S of each turn of the actual heating coil WC, which is formed in a trapezoidal shape, reaches approximately 92.5% of the design value.

[0664] Therefore, according to this embodiment, although the number of coil patterns Cp per turn of the heating coil WC is reduced compared to the comparative example, the pattern cross-sectional area S per turn of the heating coil WC is increased compared to the comparative example.

[0665] Furthermore, the cross-sectional area S of the pattern per turn of the heating coil WC (i.e., the rectangular heating coil WC of this embodiment) according to the design values ​​of this embodiment is greater than the cross-sectional area S of the pattern per turn of the heating coil WC (i.e., the rectangular heating coil WC of the comparative example) according to the design values ​​of the comparative example. Furthermore, the cross-sectional area S of the pattern per turn of the actual heating coil WC (i.e., the trapezoidal heating coil WC of this embodiment) of this embodiment is greater than the cross-sectional area S of the pattern per turn of the rectangular heating coil WC of the comparative example.

[0666] That is, the heating coil WC of this embodiment is formed to satisfy the following condition: the length W1 of the bottom edge Ca of the coil pattern Cp is set in the range of 1.47 to 1.57 times the thickness of the coil pattern Cp, so that even when the length of the top edge Cb becomes more than 20% shorter than the bottom edge Ca during the formation of the coil pattern Cp, the heating coil WC can be formed to have a sufficient pattern cross-sectional area S per turn required to effectively suppress the temperature rise of the heating coil WC.

[0667] The coil pattern Cp formed as described above can be connected to the via V, as shown in Figures 29 and 61 to 63. For example, the diameter dm of the via V connected to the coil pattern Cp can be set to be greater than the length of the bottom edge Ca of the coil pattern Cp. When the diameter dm of the via V is set to be greater than the length of the bottom edge Ca of the coil pattern Cp, the connection between the via V and the coil pattern Cp can be achieved with high reliability.

[0668] For example, even if there is a deviation in the position of the coil pattern Cp in each layer during the manufacturing process of the heating coil assembly, if the diameter dm of the via V is greater than the width of the coil pattern Cp, the possibility of properly achieving the connection between the via V and the coil pattern Cp can be increased.

[0669] Furthermore, considering that the length of the bottom edge Ca in the coil pattern Cp may be greater than the length of the top edge Cb, when the diameter dm of the via V is set to be greater than the length of the bottom edge Ca, even if the position of the coil pattern Cp in each layer deviates during the manufacturing process of the heating coil assembly, the connection between the via V and the coil pattern Cp can be achieved with high reliability.

[0670] As another example, similar to via V, the diameter of a dummy via DV (see Figure 21) that is not connected to the coil pattern Cp can also be set to be greater than the length of the bottom edge Ca of the coil pattern Cp.

[0671] As another example, the inner diameter of the via V can be set to be less than the length of the bottom edge Ca. More preferably, the inner diameter of the via V can be set to be less than the length of the top edge Cb. In this case, although the horizontal length of the area occupied by the hole portion Va within the via V decreases, the horizontal length of the area occupied by the inner wall portion Vb can increase.

[0672] As described above, when the inner diameter of the via V is set to be smaller than the length of the bottom edge Ca or the length of the top edge Cb, the connection between the via V and the coil pattern Cp can be achieved with high reliability. Furthermore, the contact area between the via V and the coil pattern Cp can be increased, thereby reducing the resistance at the connection point between the via V and the coil pattern Cp.

[0673] Additionally, the coil pattern CP may include a first coil pattern CP1 and a second coil pattern CP2. The first coil pattern CP1 may be formed into a polygonal shape, in which the bottom edge Ca is arranged on the lower side and the top edge Cb is arranged on the upper side. The second coil pattern CP2 may be formed into a polygonal shape, wherein the bottom edge Ca is arranged on the upper side and the top edge Cb is arranged on the lower side.

[0674] For example, the first coil pattern CP1 and the second coil pattern CP2 can be configured to be symmetrical about a horizontal straight line. For example, the first coil pattern CP1 and the second coil pattern CP2 can be formed into trapezoidal shapes, and can be formed to be symmetrical about the core 1110 line.

[0675] In this case, the first coil pattern CP1 and the second coil pattern CP2 can be configured not to form a completely line-symmetrical region, but to include partially line-symmetrical regions. That is, due to the position or pattern shape characteristics of the via V, some regions of the first coil pattern CP1 or the second coil pattern CP2 may not be symmetrical, and the first coil pattern CP1 and the second coil pattern CP2 may be provided in a form where the remaining regions, except for the asymmetrical regions, are line-symmetrical.

[0676] When the coil pattern CP is formed in a patterned shape on the core 1110 of the first coil plate portion 1100, the first coil pattern CP1 can be disposed on the upper side of the core 1110, and the second coil pattern CP2 can be disposed on the lower side of the core 1110.

[0677] According to this embodiment, a first coil pattern CP1 and a second coil pattern CP2 stacked in the vertical direction can be connected in the vertical direction to form a heating coil WC. In this case, coil modules 1001 and 1003 may include areas where the first coil pattern CP1 and the second coil pattern CP2 are arranged alternately in the vertical direction.

[0678] For example, multiple first coil plates 1100 can be stacked in the vertical direction, and first coil pattern CP1 and second coil pattern CP2 can be deposited on both sides of each first coil plate 1100 in the vertical direction, and thus, first coil pattern CP1 and second coil pattern CP2 can be arranged alternately in the vertical direction.

[0679] When the coil pattern Cp is formed in a patterned shape on the core 1110 of the first coil plate portion 1100, the bottom edge Ca can contact the core 1110, and the top edge Cb can be spaced apart from the core 1110 in the vertical direction by the thickness of the coil pattern Cp.

[0680] Additionally, as mentioned above, the coil pattern Cp can be formed by etching, and in this case, at least a portion of the coil pattern Cp can form a rough surface. In the previously shown figures, the coil pattern Cp has been depicted as having only a smooth surface; however, the coil pattern Cp formed by methods such as etching can actually be formed with a rough surface.

[0681] For example, in the coil pattern Cp of this embodiment, as shown in FIG65, one of the bottom edge Ca and the top edge Cb can form a flat surface, and the other of the bottom edge Ca and the top edge Cb can form a rough surface.

[0682] For example, the bottom edge Ca can form a flat surface, while the top edge Cb can form a rough surface. Through the etching process used to form the coil pattern Cp, the top edge Cb can form a rough surface, and the bottom edge Ca, which is in contact with the core 1110, can form a flat surface.

[0683] When the coil pattern Cp is formed in a patterned shape on both sides of the core 1110 in the vertical direction of the first coil plate portion 1100, the upper surface of the first coil pattern CP1 arranged on the upper side of the core 1110 can be formed with a rough surface, and the lower surface of the second coil pattern CP2 arranged on the lower side of the core 1110 can be formed with a rough surface.

[0684] As another example, as shown in Figure 66, the coil pattern Cp may be formed only on the cross-section of the first coil plate portion 1100, or the coil pattern Cp may be printed on the upper surface of each insulating layer. When the coil pattern Cp is printed on the upper surface of each insulating layer, the insulating layers and the coil pattern Cp printed thereon can be stacked sequentially from the bottom layer.

[0685] In this case, in all coil patterns Cp, the top edge Cb can be positioned above the bottom edge Ca. Therefore, in all coil patterns Cp, the top edge Cb can face one direction, for example, upwards. In other words, in all coil patterns Cp shown in Figure 66, the flat bottom edge Ca can be arranged facing downwards, while the rough top edge Cb can be arranged facing upwards.

[0686] These embodiments have been described above with reference to several illustrative embodiments. However, these embodiments are provided by way of example, and many other modifications and equivalent embodiments can be derived from these embodiments by those skilled in the art. Therefore, the technical scope of protection of the subject matter of this disclosure will be defined in accordance with the appended claims.

[0687] For example, this specification describes an embodiment of applying a heating coil assembly to a cooking appliance. However, in other embodiments, the heating coil assembly may be applied to other household appliances that require induction heating.

[0688] For example, a heating coil assembly can be installed in a washing machine and used to heat the tub, drum, or washing container inside the washing machine, or to heat the washing water.

[0689] As another example, a heating coil assembly can be installed in a water purifier and used to heat hot water pipes or water tanks.

[0690] As another example, the heating coil assembly can be installed in a dryer or garment care appliance and used to heat the air for drying clothes.

[0691] As another example, the heating coil assembly can be installed in an electric kettle or rice cooker and used to heat liquids or food inside the appliance.

[0692] [Description of reference numerals in the attached figures]

[0693] 10: Oven Section

[0694] 11: Door

[0695] 13: Main Control Panel

[0696] 100: Stove

[0697] 105: Controller

[0698] 110: Shell

[0699] 111: Bottom

[0700] 113: Side wall

[0701] 115: Support protrusion

[0702] 120: Top plate

[0703] 130: Stove control panel

[0704] 150: Support component

[0705] 160: Ferrite core

[0706] 171: Main PCB

[0707] 172: Switching power supply

[0708] 173: Inverter PCB

[0709] 174: Resonant PCB

[0710] 175: Noise Filter

[0711] 176: Fan

[0712] 180: Lighting Module

[0713] 1000: Heating coil assembly

[0714] 1001: First Coil Module

[0715] 1003: Second Coil Module

[0716] 1010: Coil board stack

[0717] 1020: Connector

[0718] 1021: First connector

[0719] 1023: Second connector

[0720] 1025: Third connector

[0721] 1030: First vertical connecting part

[0722] 1040: Second vertical connection part

[0723] 1100: First coil plate section

[0724] 1101: Patterned area

[0725] 1103: First unpatterned region

[0726] 1105: Second unpatterned region

[0727] 1110: Core

[0728] 1120: First coil section

[0729] 1120a: Dividing the area

[0730] 1120b: Separating Regions

[0731] 1121: First terminal

[0732] 1122: Second terminal

[0733] 1123: First coil wire

[0734] 1124: Second coil wire

[0735] 1200: Second coil plate section

[0736] 1210: core

[0737] 1220: Second coil section

[0738] 1300: First outer layer

[0739] 1350: Second outer layer

[0740] 1400: Adhesive material

Claims

1. A household appliance, said household appliance comprising: Multiple coil plates are stacked vertically to form a heating coil; And an adhesive material, which is stacked together with the coil plate portion in the vertical direction to connect the coil plate portion, wherein each coil plate portion includes a core and a pair of coil portions, the pair of coil portions being patterned on both sides of the core in the vertical direction, and wherein the adhesive material is disposed between the pair of coil portions facing each other in the vertical direction to form an insulating layer between the pair of coil portions.

2. The household appliance according to claim 1, wherein, The coil plate portion includes a copper-clad laminate, the copper-clad laminate including the core and foils arranged on both sides of the core in the vertical direction, and wherein the coil portion is formed by patterning the foils plated on the core into a coil shape.

3. The household appliance according to claim 2, wherein, The core is formed from FR4 prepreg.

4. The household appliance according to claim 1, wherein, The adhesive material is formed from a prepreg material.

5. The household appliance according to claim 1, wherein, The adhesive material comprises a plurality of prepreg films stacked in the vertical direction.

6. The household appliance according to claim 1, wherein, The thickness of the adhesive material is greater than the thickness of the core.

7. The household appliance according to claim 1, wherein, The thickness of the adhesive material is greater than the thickness of the coil portion.

8. The household appliance according to claim 1, wherein, The thickness of the adhesive material is greater than or equal to twice the thickness of the coil portion.

9. The household appliance according to claim 6, wherein, Four to six of the coil plates are stacked in the vertical direction, wherein the thickness of each core is 0.09 mm to 0.11 mm, the thickness of each coil portion is 0.10 mm to 0.11 mm, and the thickness of each adhesive material is 0.28 mm to 0.36 mm.

10. The household appliance according to claim 1, wherein, A coil module is formed by stacking a plurality of coil plates in the vertical direction. The coil module includes an outer layer disposed on the outer side of the coil plate stack in the vertical direction. The coil portion and the outer layer are connected in the vertical direction to form the heating coil.

11. The household appliance according to claim 10, wherein, The coil plate stack is arranged between a pair of outer layers spaced apart from each other along the vertical direction, wherein the total number of the coil portions and the outer layers is an even number.

12. The household appliance according to claim 10, wherein, The adhesive material is disposed between the coil plate stack and the outer layer, wherein the adhesive material forms the insulating layer between the coil portion and the outer layer and connects the coil plate stack to the outer layer.

13. The household appliance according to claim 1, wherein, The coil portion and the insulating layer are arranged alternately in the vertical direction, and wherein the insulating layer is formed by the core and the adhesive material.

14. A method for manufacturing a heating coil assembly, the method comprising the following steps: A coil forming step, wherein a coil portion is formed on each of a plurality of coil plates; A stacking step, wherein the plurality of coil plates are stacked vertically to form a coil plate stack; And a connection step, wherein the connection step connects the vertically stacked multiple coil portions along the vertical direction.

15. The method of manufacturing a heating coil assembly according to claim 14, wherein, The stacking step includes: stacking the coil plate portions and adhesive material in the vertical direction such that the coil plate portions and adhesive material are stacked alternately, then heating and pressurizing, and wherein, in the stacking step, the plurality of coil plate portions stacked in the vertical direction are interconnected by the adhesive material to form the coil plate stack, and an insulating layer is formed between a pair of coil portions facing each other along the vertical direction.

16. The method of manufacturing a heating coil assembly according to claim 15, wherein, The stacking step includes: stacking four prepreg films in the vertical direction between a pair of coil plates stacked in the vertical direction, wherein the thickness of each coil portion among the coil portions is 0.10 mm to 0.11 mm, and wherein the thickness of each prepreg film among the prepreg films is 0.07 mm to 0.09 mm.

17. The method of manufacturing a heating coil assembly according to claim 14, wherein, The connection step includes: a hole processing step, wherein the hole processing step forms a hole portion in the coil plate stack, the hole portion being connected to the plurality of coil portions stacked in the vertical direction; and a via forming step, wherein the via forming step forms a via in the hole portion.

18. The method of manufacturing a heating coil assembly according to claim 14, the method further comprising the step of: The outer layer forming step involves forming an outer layer on the outer side of the coil plate stack in the vertical direction.

19. The method of manufacturing a heating coil assembly according to claim 18, wherein, The stacking step includes: stacking the coil plates and foils such that the plurality of coil plates are arranged between a pair of foils, then heating and pressurizing, and wherein the outer layer forming step forms the outer layer by processing the foils into a coil shape.

20. A method of manufacturing a household appliance, the method comprising the method according to any one of claims 14 to 19.

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