Working coil and household appliance comprising same

Abstract

The present specification relates to a working coil and a home appliance including the same. In one embodiment, a working coil may include a plurality of first coil layers arranged along a first pattern and stacked in a vertical direction; and a plurality of second coil layers arranged along the second pattern and stacked in the vertical direction, the plurality of second coil layers being arranged in a layer different from the plurality of first coil layers. In one embodiment, the working coil may include a connected region and a non-connected region. In one embodiment, the connection region may include a via that electrically connects at least one coil strand included in the plurality of first coil layers with at least one coil strand included in the plurality of second coil layers.

Description

Technical Field

[0001] This disclosure relates to working coils and household appliances that include working coils. Background Technology

[0002] Recently, various household appliances have been used to make human life more convenient. Examples of these appliances include cooking appliances, refrigerators, washing machines, dryers, laundry management machines, water purifiers, and more.

[0003] Cooking appliances are household appliances used for cooking food. They are installed in the kitchen space and are used to cook food according to the user's intentions. Such cooking appliances can be classified into various categories based on the shape and type of heat source or fuel used.

[0004] When categorizing cooking appliances based on the method of cooking food, they can be classified into open-type and closed-type cooking appliances according to the type of space where food is placed. Examples of closed-type cooking appliances include ovens and microwave ovens, while examples of open-type cooking appliances include cooktops and stove racks.

[0005] In open-top cooking appliances, the cooktop is configured to heat food contained in a cooking container via at least one burner. The cooktop can be provided with an electric burner or with a gas burner. Alternatively, the cooktop can be implemented as a standalone unit or as an oven including a furnace located beneath the cooktop.

[0006] As an example of a cooktop with an electric burner, there exists an induction heating device. An induction heating device is a cooking appliance that performs cooking functions using an induction heating method. In an induction heating device, when an electric current is applied to a working coil, eddy currents can be generated in a cooking container made of magnetic material, and food can be cooked by the cooking container, which generates heat by acting as the resistance of the eddy currents.

[0007] This induction heating device does not require gas combustion, and therefore does not produce combustion exhaust gases. Furthermore, by allowing the container itself to generate heat immediately, the induction heating device minimizes the heat transfer process via thermal radiation or conduction, thus enabling the rapid heating of cooked food.

[0008] Typically, in an induction heating device, the location for placing the cooking container is marked on a top plate above the working coil, and the cooking container is heated by the working coil while it is placed in the marked area.

[0009] In an induction heating device, one or more working coils and a circuit board can be provided. The working coil is used to transfer electromagnetic force to the cooking container. Typically, the working coil can be formed in the form of a wire wound into a spiral shape. And the circuit board can play a role in controlling the supply of induced current to the working coil in a circuit manner.

[0010] Recently, working coils in the form of coil patterns formed on circuit boards have also been used instead of working coils in the form of wires wound in a spiral shape.

[0011] The cost and time spent manufacturing the working coil constitute a large proportion of the total cost and time required to produce an induction heating device. The cost of the wire itself, and the time and cost required for winding it, are particularly significant.

[0012] If the working coil is formed by creating a coil-shaped pattern on a circuit board, rather than by winding wire, the cost and time spent manufacturing the working coil can be reduced.

[0013] High-frequency power is applied to the working coil, thereby generating a considerable amount of heat in the working coil. In particular, in induction heating devices that require high power, a large amount of heat is generated in the working coil when high power is applied.

[0014] 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 where the coil pattern is concentrated. As a result, the circuit board with the working coil may inevitably be subjected to a large amount of heat relative to its area, and therefore, the temperature of the circuit board may rise excessively.

[0015] Meanwhile, an induction heating device has recently been developed that automatically identifies the size and position of the cooking container and performs heating appropriately even if the cooking container is not placed in a specific location. To perform heating more effectively in this type of induction heating device, it is necessary to increase the number of working coils installed in the induction heating device.

[0016] Therefore, due to the temperature rise problem caused by coil pattern concentration, it is difficult to apply working coils in the form of coil patterns to the above-mentioned type of induction heating device. Summary of the Invention

[0017] Technical issues

[0018] The purpose of this disclosure is to provide a working coil and a household appliance including the working coil, the structure of which is improved to suppress temperature rise.

[0019] Furthermore, the purpose of this disclosure is to provide a working coil and a household appliance including the working coil, the structure of which is improved to increase the density of the area occupied by the working coil in the cooktop.

[0020] Furthermore, the purpose of this disclosure is to provide a working coil and a household appliance including the working coil, the structure of which is improved to allow the working coil to be arranged more densely while suppressing the temperature rise of the working coil.

[0021] Furthermore, the purpose of this disclosure is to provide a working coil and a household appliance including the working coil, the structure of which is improved to reduce the loss of the original substrate used to manufacture the coil substrate portion, while increasing the density of the area occupied by the working coil in the cooktop.

[0022] Furthermore, the purpose of this disclosure is to provide a working coil and a household appliance including the working coil, the structure of which is improved to simplify the connection structure between the working coil and the electronic unit.

[0023] Furthermore, the purpose of this disclosure is to provide a working coil and a household appliance including the working coil, the structure of which is improved to suppress the reduction of the cross-sectional area of ​​the pattern per turn of the working coil caused by foil loss generated during the coil patterning process.

[0024] Furthermore, the purpose of this disclosure is to provide a working coil and a household appliance including the working coil, which can make the current distribution and magnetic flux density distribution of the working coil more uniform by reducing the proximity effect and skin effect of the coil strands included in the working coil.

[0025] Furthermore, the purpose of this disclosure is to reduce power loss and improve power efficiency during the operation of household appliances.

[0026] Furthermore, the purpose of this disclosure is to mitigate the phenomenon that the temperature of a specific area of ​​the working coil becomes excessively higher than that of other areas during the operation of a household appliance.

[0027] The purpose of this disclosure is not limited to the above-described objectives, and other objectives and advantages not mentioned herein will become clearer from the embodiments described below. Furthermore, the objectives and advantages of this disclosure can be achieved by the components and combinations thereof described in the claims.

[0028] Problem-solving methods

[0029] According to one embodiment, the working coil may include: a plurality of first coil layers arranged along a first pattern and stacked in a vertical direction; and a plurality of second coil layers arranged along a second pattern, stacked in a vertical direction, and disposed in a layer different from the plurality of first coil layers.

[0030] In one embodiment, the working coil may include a connected region and a non-connected region.

[0031] In one embodiment, the connection region may include a via that electrically connects at least one coil strand in the plurality of first coil layers to at least one coil strand in the plurality of second coil layers.

[0032] In one embodiment, each coil strand included in the plurality of first coil layers and each coil strand included in the plurality of second coil layers may be disposed in different traces in the non-connected region.

[0033] In one embodiment, each coil strand included in the plurality of first coil layers and each coil strand included in the plurality of second coil layers may be disposed in the same trace in the non-connection region.

[0034] In one embodiment, each coil strand included in the plurality of first coil layers and each coil strand included in the plurality of second coil layers may be parallel to each other in the non-connected region.

[0035] In one embodiment, each coil strand included in the plurality of first coil layers and each coil strand included in the plurality of second coil layers may cross each other in the connection region.

[0036] In one embodiment, the connection area may include two or more via patterns.

[0037] In one embodiment, each via pattern may be arranged on a straight line orthogonal to the coil strands included in the plurality of first coil layers or the plurality of second coil layers.

[0038] In one embodiment, each via pattern may be arranged on a straight line intersecting with coil strands included in the plurality of first coil layers or the plurality of second coil layers at a predetermined angle.

[0039] In one embodiment, the working coil may include multiple coil turns.

[0040] In one implementation, each via pattern included in each coil turn can be arranged on the same straight line.

[0041] In one embodiment, the via pattern included in each coil turn may be positioned in the same location as the via pattern included in another coil turn.

[0042] In one implementation, each via pattern included in the nth coil turn may be arranged on a first straight line, and each via pattern included in the (n+1)th coil turn may be arranged on a second straight line (where n is a positive integer).

[0043] In one implementation, the connected region and the unconnected region may be alternately provided.

[0044] In one embodiment, the working coil may be included in a household appliance and used to heat an object.

[0045] According to one embodiment, the working coil may include: a plurality of first coil layers arranged along a first pattern and stacked in a vertical direction; a plurality of second coil layers arranged along a second pattern, stacked in a vertical direction, and disposed in a layer different from the plurality of first coil layers; and a plurality of third coil layers arranged along a third pattern, stacked in a vertical direction, and disposed in a layer different from the plurality of first coil layers and the plurality of second coil layers.

[0046] In one embodiment, the working coil may include a connected region and a non-connected region.

[0047] In one embodiment, the connection area may include a via that can electrically connect at least one coil strand included in the plurality of first coil layers, at least one coil strand included in the plurality of second coil layers, and at least one coil strand included in the plurality of third coil layers.

[0048] In one embodiment, each coil strand included in the plurality of first coil layers, each coil strand included in the plurality of second coil layers, and each coil strand included in the plurality of third coil layers may be disposed in the same trace in the non-connection region.

[0049] In one embodiment, the connection area may include a first connection area and a second connection area.

[0050] In one implementation, the via may be formed in the nth coil turn in the first connection region (where n is a positive integer).

[0051] In one embodiment, the via may be formed in the (n+1)th coil turn in the second connection region (where n is a positive integer).

[0052] In one embodiment, at least one coil strand in each of the plurality of first coil layers and at least one coil strand in each of the plurality of second coil layers can be electrically connected through the via in the first connection region.

[0053] In one embodiment, at least one of each coil strand in the plurality of second coil layers and at least one of each coil strand in the plurality of third coil layers can be electrically connected through the via in the second connection region.

[0054] In one embodiment, each coil strand included in the plurality of first coil layers, each coil strand included in the plurality of second coil layers, and each coil strand included in the plurality of third coil layers may cross each other in the connection region.

[0055] In one embodiment, the connection area may include two or more via patterns.

[0056] In one embodiment, each via pattern may be arranged on a straight line orthogonal to the coil strands included in the plurality of first coil layers, the plurality of second coil layers, or the plurality of third coil layers.

[0057] In one embodiment, each via pattern may be arranged on a straight line that intersects with coil strands included in the plurality of first coil layers, the plurality of second coil layers, or the plurality of third coil layers at a predetermined angle.

[0058] In one embodiment, the working coil may include multiple coil turns.

[0059] In one implementation, each via pattern included in the nth coil turn may be arranged on a first straight line, and each via pattern included in the (n+1)th coil turn may be arranged on a second straight line (where n is a positive integer).

[0060] In one implementation, the connected region and the unconnected region may be alternately provided.

[0061] In one embodiment, in the nth coil turn, the first connected region and the non-connected region may be alternately arranged, and in the (n+1)th coil turn, the second connected region and the non-connected region may be alternately arranged (where n is a positive integer).

[0062] In one embodiment, the working coil may be included in a household appliance and used to heat an object.

[0063] Beneficial effects

[0064] According to the implementation, multiple coil patterns stacked in the vertical direction are connected to each other in the vertical direction to form a working coil in the form of a patterned coil, thereby increasing the length of the working coil in the vertical direction, so that the patterned cross-sectional area of ​​each turn of the working coil can be effectively increased.

[0065] According to the implementation method, by suppressing the increase in the size of the working coil in the horizontal direction and increasing the pattern cross-sectional area of ​​each turn of the working coil, the temperature rise of the working coil can be effectively suppressed.

[0066] According to the implementation method, since the working coil, which is formed into a polygonal shape similar to the shape of the stove surface, is also formed into a polygonal shape similar to the shape of the coil module, the density of the area occupied by the working coil within the stove surface can be effectively increased.

[0067] According to the implementation method, the heating efficiency of household appliances can be increased by increasing the area of ​​the region where the object to be heated contacts the working coil.

[0068] According to the embodiment, multiple coil lines stacked in the vertical direction are connected to each other in the vertical direction to form a working coil, and a horizontal twist structure and a vertical twist structure are formed in the working coil, so that the increase in the horizontal dimension of the working coil can be minimized while increasing the pattern cross-sectional area of ​​each turn of the working coil.

[0069] According to the implementation method, by reducing the size of the working coil and simultaneously reducing the current density flowing in the working coil, the working coil can be arranged more closely together compared to a cooktop of the same standard size, and can maintain maximum output for a longer period of time compared to a cooktop of the same size.

[0070] According to the implementation method, by using densely arranged small working coils, improved heating efficiency and higher output can be provided over a longer period of time.

[0071] According to the implementation method, by allowing the coil assembly to be made from a combination of multiple coil modules, the loss of the original substrate used to manufacture the coil modules can be reduced, and the space required to set up the control panel on the cooktop can be effectively ensured.

[0072] According to the embodiment, the wiring for connecting the working coil and the sensing coil to the terminal portion is formed in a patterned form within the coil module itself, and the connection between the working coil and the sensing coil and the electronic unit can be achieved solely through the connection between the terminal portion and the electronic unit. Therefore, the connection structure between the electronic unit and the working coil and the sensing coil can be formed very simply.

[0073] According to the implementation method, in addition to allowing easy and quick connection between coil assemblies and electronic units, it can also effectively prevent the internal space of the cooktop containing the coil assemblies and electronic units from becoming complicated by a large amount of wiring.

[0074] According to the implementation method, since the proximity effect and skin effect of the coil strands included in the working coil are reduced, the current distribution and magnetic flux density distribution of the working coil can become more uniform.

[0075] According to the implementation method, power loss during the operation of household appliances can be reduced, and power efficiency can be improved.

[0076] According to the implementation method, the phenomenon that the temperature of a specific area of ​​the working coil becomes excessively higher than that of other areas during the operation of a household appliance can be mitigated. Attached Figure Description

[0077] Figure 1 This is a perspective view showing a household appliance according to an embodiment.

[0078] Figure 2 It is shown separately. Figure 1 The diagram shows the plan view of the stove surface.

[0079] Figure 3 It is shown Figure 2 The view shown shows the indicator lights on the cooktop.

[0080] Figure 4 It is shown Figure 2 The diagram shows an exploded perspective view of the stove surface.

[0081] Figure 5 It shows that electronic components are installed in Figure 4 A view showing the state of the bottom surface of the support member.

[0082] Figure 6 It is shown schematically. Figure 4 A plan view showing the configuration of the coil assembly.

[0083] Figure 7 It is shown schematically. Figure 6 The diagram shows a cross-sectional view of the stacked structure of the coil modules.

[0084] Figure 8 This is a plan view showing a first example of the layout structure of the first coil module and the second coil module.

[0085] Figure 9 This is a view schematically showing an example of the cutting state of the original substrate used to form the first coil substrate portion.

[0086] Figure 10 This is a plan view showing a second example of the layout structure of the first coil module and the second coil module.

[0087] Figure 11 It is shown Figure 8 A plan view of another example of the layout structure of the first and second coil modules shown.

[0088] Figure 12 It is shown Figure 10 A plan view of another example of the layout structure of the first coil module and the second coil module shown.

[0089] Figure 13 This is a plan view showing a third example of the layout structure of the first coil module and the second coil module.

[0090] Figure 14 This is a plan view showing a fourth example of the layout structure of the first coil module and the second coil module.

[0091] Figure 15 This is a plan view showing a fifth example of the layout structure of the first coil module and the second coil module.

[0092] Figure 16 This is a plan view showing a sixth example of the layout structure of the first coil module and the second coil module.

[0093] Figure 17 This is a plan view showing an example of the first coil substrate portion according to an embodiment.

[0094] Figure 18 It is shown Figure 17 An enlarged view of a portion of the first coil substrate shown.

[0095] Figure 19 It is shown schematically. Figure 18 The cross-sectional view of the stacked structure of the first coil section is shown.

[0096] Figure 20 This is a plan view showing an example of the layout structure of the sensing coil.

[0097] Figure 21 yes Figure 20 The enlarged view of section "21" shows an example of the layout structure of the sensing coil relative to the working coil.

[0098] Figure 22 yes Figure 18 An enlarged view of the first terminal shown.

[0099] Figure 23 yes Figure 18 An enlarged view of the second terminal shown.

[0100] Figure 24 This is a plan view showing a seventh example of the layout structure of the first coil module and the second coil module.

[0101] Figure 25 This is a block diagram schematically illustrating the power-related configuration of a household appliance according to an embodiment.

[0102] Figure 26 This is a circuit diagram of a household appliance according to one embodiment.

[0103] Figure 27 This is a plan view showing an example of a working coil.

[0104] Figure 28 This is an enlarged view of a portion of the first coil layer group of the coil pattern of the working coil according to the first embodiment.

[0105] Figure 29 This is an enlarged view of a portion of the second coil layer group of the coil pattern of the working coil according to the first embodiment.

[0106] Figure 30 This is an enlarged view of a portion of the first coil layer group and the second coil layer group of the working coil according to the first embodiment.

[0107] Figure 31 This is a cross-sectional view of the connection area of ​​the coil pattern of the working coil according to the first embodiment.

[0108] Figure 32 This is a cross-sectional view of the AA1-AA2 portion of the connection area of ​​the coil pattern of the working coil according to the first embodiment.

[0109] Figure 33 This is a cross-sectional view of the BB1-BB2 portion of the non-connected area of ​​the coil pattern of the working coil according to the first embodiment.

[0110] Figure 34 This is an enlarged view of a portion of the first coil layer group of the coil pattern of the working coil according to the second embodiment.

[0111] Figure 35 This is an enlarged view of a portion of the second coil layer group of the coil pattern of the working coil according to the second embodiment.

[0112] Figure 36 This is an enlarged view of a portion of the first and second coil layer groups of the working coil according to the second embodiment.

[0113] Figure 37 This is a cross-sectional view of the non-connected area of ​​the coil pattern of the working coil according to the second embodiment.

[0114] Figure 38 This is a cross-sectional view of the AA1-AA2 portion of the connection area of ​​the coil pattern of the working coil according to the second embodiment.

[0115] Figure 39 This is a cross-sectional view of the BB1-BB2 portion of the connection area of ​​the coil pattern of the working coil according to the second embodiment.

[0116] Figure 40 This is an enlarged view of a portion of the first coil layer group of the coil pattern of the working coil according to the third embodiment.

[0117] Figure 41 This is an enlarged view of a portion of the second coil layer group of the coil pattern of the working coil according to the third embodiment.

[0118] Figure 42 This is an enlarged view of a portion of the third coil layer group of the coil pattern of the working coil according to the third embodiment.

[0119] Figure 43 This is an enlarged view of a portion of the first coil layer group, the second coil layer group, and the third coil layer group of the working coil according to the third embodiment.

[0120] Figure 44 This is a cross-sectional view of the non-connected area of ​​the coil pattern of the working coil according to the third embodiment.

[0121] Figure 45 This is a cross-sectional view of the AA1-AA2 portion of the connection area of ​​the coil pattern of the working coil according to the third embodiment.

[0122] Figure 46 This is a cross-sectional view of the BB1-BB2 portion of the connection area of ​​the coil pattern of the working coil according to the third embodiment.

[0123] Figure 47 This is an enlarged view of a portion of the first coil layer group of the coil pattern of the working coil according to the fourth embodiment.

[0124] Figure 48 This is an enlarged view of a portion of the second coil layer group of the coil pattern of the working coil according to the fourth embodiment.

[0125] Figure 49 This is an enlarged view of a portion of the first and second coil layer groups of the working coil according to the fourth embodiment.

[0126] Figure 50 This is a cross-sectional view of the non-connected area of ​​the coil pattern of the working coil according to the fourth embodiment.

[0127] Figure 51 This is a cross-sectional view of the AA1-AA2 portion of the connection area of ​​the coil pattern of the working coil according to the fourth embodiment.

[0128] Figure 52 This is a cross-sectional view of the BB1-BB2 portion of the connection area of ​​the coil pattern of the working coil according to the fourth embodiment.

[0129] Figure 53 This is a circuit diagram of a sensing circuit according to one embodiment.

[0130] Figure 54 This is a diagram showing the waveform of the resonant signal output from the output node of the sensing circuit according to the embodiment.

[0131] Figure 55 This is a diagram showing the waveform of the square wave output from the comparator of the sensing circuit according to the embodiment. Detailed Implementation

[0132] The above-described objects, 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 practice the technical ideas of this disclosure. In describing this disclosure, detailed descriptions of known technologies related to this disclosure will be omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of this disclosure. Preferred embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar components.

[0133] Although the terms "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another, and unless otherwise specified, it should be understood that a first component can also be a second component.

[0134] This disclosure is not limited to the embodiments disclosed below and can be modified in various ways, and can be implemented in many different forms. These embodiments are provided merely to ensure the completeness of the disclosure and to fully inform those skilled in the art of its scope. Therefore, it should be understood that this disclosure is not limited to the embodiments disclosed below, but includes all variations, equivalents, or substitutions included within the technical concept and scope of this disclosure, as well as the substitution of components of one embodiment with components of another embodiment and the addition of components to another embodiment.

[0135] The accompanying drawings are provided only for easy understanding of the embodiments disclosed herein, and the technical concepts disclosed herein are not limited to the drawings. Furthermore, it should be understood that this disclosure includes all modifications, equivalents, or substitutions falling within the technical concept and scope of this disclosure. In the drawings, for ease of understanding, components may be exaggerated in size or thickness as large or small, but the scope of protection of this disclosure should not be construed as limited thereto.

[0136] The terminology used herein is for describing a particular implementation or method only and is not intended to limit this disclosure. Furthermore, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as “comprising,” “including,” “having,” “equipped with,” “consisting of,” etc., are intended to indicate the presence of the features, quantities, steps, operations, components, parts, or combinations thereof described herein. That is, it should be understood that the use of terms such as “comprising,” “including,” “having,” “equipped with,” “consisting of,” etc., herein does not presuppose the presence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0137] Ordinal terms (such as first, second, etc.) may be used to describe various components, but these components are not limited by these terms. The terms mentioned above are used only for the purpose of distinguishing one component from another.

[0138] When the first component is described as "connected" or "linked" to the second component, it should be understood that these components can be directly connected or linked to each other, but a third component can be inserted between these components. On the other hand, when the first component is described as "directly connected" or "directly linked" to the second component, it should be understood that no other component is inserted between them.

[0139] When a component is described as "above another component" or "below another component", it should be understood that the component may be configured to contact the top (or bottom) surface of another component, and yet another component may be inserted therebetween.

[0140] 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 to which this disclosure pertains. Terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an ideal or overly formal sense unless expressly defined in this application.

[0141] When an appliance is placed on the floor, the direction in which the door is installed is defined as forward, based on the center of the appliance. Therefore, the direction to enter the appliance after opening the door is backward. Furthermore, the horizontal direction perpendicular to the forward-backward direction of the appliance, that is, the width direction of the appliance when viewed from the front of the door, can be referred to as the left-right direction.

[0142] For convenience, the left and right directions can be referred to as the first direction. Then, the right side can be referred to as one side of the first direction, and the left side can be referred to as the other side of the first direction.

[0143] Additionally, the width direction of a household appliance can be referred to as the horizontal direction. Then, the right side can be referred to as one side in the horizontal direction, and the left side can be referred to as the other side in the horizontal direction.

[0144] 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.

[0145] For convenience, we can refer to the directions facing forward and backward as the second direction. Then, the front side can be referred to as one side of the second direction, and the rear side can be referred to as the other side of the second direction.

[0146] Furthermore, the aforementioned up and down directions can be referred to as the third direction. Then, the upward direction can be referred to as one side of the third upward direction, and the downward direction can be referred to as the other side of the third upward direction.

[0147] Furthermore, the aforementioned 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 both be referred to as the horizontal direction.

[0148] Throughout this document, unless otherwise stated, “A and / or B” means A, B, or A and B, and unless otherwise stated, “C to D” means equal to or greater than C and equal to or less than D.

[0149] [The overall structure of home appliances]

[0150] Figure 1 This is a perspective view showing a household appliance according to an embodiment; Figure 2 It is shown separately. Figure 1 The plan view of the stovetop shown; and Figure 3 It is shown Figure 2 The view shown shows the indicator lights on the cooktop.

[0151] Reference Figures 1 to 3The household appliance according to one embodiment may include a cooktop 100. Additionally, the household appliance according to one embodiment may also include a stove section 10. In this embodiment, the household appliance is exemplified as being provided in the form of an oven.

[0152] The household appliance provided in the form of an oven, according to the embodiment, can provide the functions of an oven as a closed household appliance and a cooktop as an open household appliance. The household appliance may include an oven section 10 and a cooktop 100.

[0153] The oven section 10 may have a cooking chamber formed therein. In the oven section, food can be cooked as the interior of the cooking chamber is heated.

[0154] In the furnace section 10, a heating element may be provided to heat the cooking chamber. The heating element may be configured as a gas-fueled heating device or as an electric heater.

[0155] In household appliances, the door 11 can be rotatably configured to selectively open and close the cooking chamber. As an example, the door can be configured to open and close the cooking chamber by pulling down, with the upper end pivoting up and down about its lower end.

[0156] A control panel 13 (hereinafter referred to as the "main control panel") may be installed on the upper part of the front surface of a household appliance. The main control panel 13 may form part of the exterior of the front surface of the household appliance. The main control panel 13 may be equipped with various switches for adjusting the operation of the household appliance, a display for showing the operating status of the household appliance, etc.

[0157] A cooktop surface 100 may be provided on the upper side of the stove section 10. The cooktop surface is configured to heat food or a container holding food placed on top of the cooktop surface 100.

[0158] [Overall structure of the stovetop]

[0159] Figure 4 It is shown Figure 2 The image shown is an exploded 3D view of the stovetop. Figure 5 It shows that electronic components are installed in Figure 4 A view showing the state of the bottom surface of the support member.

[0160] See Figures 1 to 5The cooktop 100 may include a housing 110 and a top plate 120. In one embodiment, the exterior of the cooktop 100 may be formed by the housing 110 and the top plate 120. The housing 110 may be disposed below the top plate 120 and may form the front surface, rear surface, side surface, and bottom surface of the cooktop. The top plate 120 may be disposed on the upper end of the cooktop 100 and may form the top surface of the exterior of the cooktop 100.

[0161] An accommodating space can be formed inside the housing 110. The accommodating space formed inside the housing 110 can open upwards. As an example, the housing 110 can be formed into a hexahedral shape with an opening on the upper side. Various internal components can be accommodated in the accommodating space surrounded by the top plate 120 and the housing 110 to form the cooktop 100.

[0162] In one embodiment, the housing 110 may include a bottom 111. The bottom 111 may form the bottom surface of the housing 110 to define the lower boundary surface of the receiving space. The bottom 111 may be disposed below the top plate 120 to form a plane parallel to the top plate 120.

[0163] Additionally, the housing 110 may include a sidewall portion 113. The sidewall portion 113 may form the front surface, rear surface, and two side surfaces of the housing 110 to form a vertical wall shape extending upward from the edge of the bottom 111. The sidewall portion 113 may define the horizontal boundary surface of the accommodating space.

[0164] Additionally, the cooktop 100 may be provided with a heating element for heating food to be cooked or a container holding the food (hereinafter referred to as "the object to be heated"). The heating element may be provided with at least one burner. For example, the burner may be provided in the form of a working coil or a heating coil that uses electricity.

[0165] In this embodiment, the cooktop 100 is exemplified as being provided in the form of an induction heating device. The burner of the cooktop 100 may include a working coil. A burner including the working coil as described above can be operated by a high-frequency current applied by an inverter to generate a strong magnetic field.

[0166] The magnetic field lines generated in the burner, which includes the working coil as described above, can generate eddy currents in the container, and heat is generated due to the flow of the eddy currents in the container, thereby heating the container, and thus the food contained in the container can be heated by heating the container.

[0167] Additionally, according to one embodiment, the cooktop 100 may be equipped with a control panel 130. The control panel 130 may be located in the top plate 120. The control panel 130 may include an operating part, which includes various switches for adjusting the operation of the cooktop 100, a display for showing the operating status of the cooktop 100, etc.

[0168] The cooktop 100 may be equipped with multiple indicator lights L. The indicator lights L can provide indication on the top plate 120 of the cooktop. The indicator lights L can display information related to the location of the food to be heated or the cooking container holding the food (hereinafter referred to as the "object to be heated"), the heating status of the object to be heated, the temperature, etc.

[0169] According to one embodiment, a cooktop 100 may include a coil assembly 1000. The coil assembly 1000 may be configured to constitute a heating portion of the cooktop 100 and may be disposed within a receiving space inside the cooktop 100.

[0170] Additionally, the cooktop 100 may include a support member 150. The support member 150 may be disposed on the underside of the top plate 120. The support member 150 may be disposed in the space surrounded by the top plate 120 and the outer casing 110, i.e., in the receiving space.

[0171] The support member 150 can be formed as a frame for supporting various internal components constituting the cooktop 100. For example, the support member 150 can be formed as a hexahedron shape with an opening on the lower side. For example, the support member 150 can be formed as an inverted form of the housing 110, having a size slightly smaller than that of the housing 110.

[0172] In one embodiment, a receiving space may be formed inside the support 150 to form a space surrounded by the bottom 111 of the outer casing 110 and the support 150. That is, various internal components constituting the cooktop 100 may be received inside the support 150.

[0173] In one embodiment, the support 150 may also provide a coil base function. That is, a ferrite core 160 may be mounted on the support 150, and the coil assembly 1000 may be mounted on the upper side of the support 150, with the ferrite core 160 mounted on the support 150 in this manner.

[0174] As an example, the ferrite core 160 can be formed by a combination of multiple ferrite modules 161 provided as individual elements. That is, the ferrite core 160 can be configured in a structure in which the ferrite core 160 can be separated into multiple ferrite modules 161.

[0175] In this embodiment, the ferrite module 161 is illustrated such that each is configured to be coupled to the support member 150. For this purpose, the support member 150 may have a structure formed therein for cooperating with the ferrite module 161. Each ferrite module 161 can be coupled to the support member 150 by being assembled into this structure.

[0176] Each ferrite module 161 includes ferrite capable of forming a magnetic field around the ferrite module 161. As an example, each ferrite module 161 may be provided in the form of insert-injected ferrite.

[0177] The ferrite core 160, formed by combining multiple ferrite modules 161 as described above, can reduce the number of working hours required to install the ferrite core 160 in the cooktop 100. Furthermore, the ferrite core 160 has the advantage that if a portion of the ferrite core 160 is damaged, it can be repaired by replacing the corresponding ferrite module 161.

[0178] 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 illuminating the light display area of ​​the top panel 120 by the illumination module 180.

[0179] In this embodiment, the light display area is the area from which the light emitted from the lighting module 180 can be identified from the outside via the top plate 120, that is, the area from the top plate 120 that illuminates the light emitted from the lighting module 180, and is defined as a predetermined portion of the entire area of ​​the top plate 120.

[0180] As an example, the light display area can be a virtual area designated as the portion of the top plate 120 from which light emitted from the lighting module 180 will be illuminated. In this case, the light display area is not a portion that is prominently marked on the top plate 120 by means of methods such as performing a separate surface treatment on the surface of the top plate 120, but simply a virtual area.

[0181] As another example, the light display area can be an area that is prominently marked on the top plate 120 by means of a method such as performing a separate surface treatment on the surface of the top plate 120.

[0182] The lighting module 180 may include a light source. As an example, an LED can be used as a light source, but the types of light sources that can be used as a light source are not limited to LEDs.

[0183] The lighting module 180 may include multiple light sources, which may be disposed in each lighting module 180 and spaced apart from each other by a predetermined interval in the front-to-back direction. As an example, the lighting module 180 may be provided in the form of multiple light sources mounted on a PCB in the form of a PCB. 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 or intensity of the lighting to be achieved by the lighting module 180.

[0184] Furthermore, multiple lighting modules 180 can be arranged in the cooktop surface, and the multiple lighting modules 180 can be arranged to be spaced apart from each other at predetermined intervals in the lateral direction. The number of lighting modules 180 and the distance between lighting modules 180 can be appropriately set by taking into account the size and number of working coils, the distance between working coils, etc.

[0185] At least a portion of the lighting module 180 may be disposed between the support 150 and the bottom 111. As an example, the lighting module 180 may be disposed within a receiving space. More specifically, the lighting module 180 may be disposed within a space surrounded by the bottom 111 of the housing 110 and the support 150.

[0186] Inside the cooktop 100, that is, in the accommodating space, various electronic components can be installed. For example, inside the cooktop 100, a main PCB 171, a switch-mode power supply (SMPS) 162, an inverter PCB 163, a resonant PCB 164, an EMI filter 165, a fan 176, etc., can be installed.

[0187] In the following text, the electronic components will be collectively referred to as electronic unit 170. Electronic unit 170 may include at least one of a power processing section and a coil control section. The power processing section may be provided to supply power to the coil assembly 1000, and the power processing section may include a switch-mode power supply (SMPS) 162, an EMI filter (EMI filter 165), etc. The coil control section is provided to control the operation of the coil assembly 1000, and the coil control section may include an inverter PCB 174, etc.

[0188] [Overall structure of the coil assembly]

[0189] Figure 6 It is shown schematically. Figure 4 A view showing the configuration of the coil assembly, and Figure 7 It is shown schematically. Figure 6 The diagram shows a cross-sectional view of the stacked structure of the coil modules.

[0190] Reference Figure 4 and Figure 6The coil assembly 1000 may include a plurality of working coils WC arranged in a horizontal direction. For example, in the coil assembly 1000, the plurality of working coils WC may be arranged in a first direction (i.e., the lateral direction) and the plurality of working coils WC may be arranged in a second direction (i.e., the front-to-back direction).

[0191] The coil assembly 1000 may include at least one coil module 1001, 1003. In this embodiment, the coil assembly 1000 is illustrated as including a plurality of coil modules 1001, 1003.

[0192] As an example, the coil assembly 1000 may include a plurality of coil modules 1001, 1003 arranged in a horizontal direction. For example, the coil assembly 1000 may include a plurality of coil modules 1001, 1003 arranged in a first direction.

[0193] In each coil module 1001, 1003, such as Figure 6 and Figure 7 As shown, multiple working coils WC can be arranged in the horizontal direction. Each working coil WC can be provided in the form of a spiral coil formed as a pattern on a printed circuit board. That is, the working coils WC can be provided in the form of a pattern formed in coil modules 1001, 1003.

[0194] Each of the coil modules 1001 and 1003 may include a coil substrate stack 1010. The coil substrate stack 1010 may include a plurality of first coil substrate portions 1100 stacked in the vertical direction.

[0195] Each of the first coil substrate portions 1100 may include a first coil portion 1120. As an example, the first coil portion 1120 may be formed as a result of a metal foil stacked on the surface of the first coil substrate portion 1100 being patterned into a spiral coil shape.

[0196] In one embodiment, a plurality of first coil substrate portions 1100 may be stacked in the vertical direction to form a coil module 1001, 1003, and thereby a plurality of first coil portions 1120 may be stacked in the vertical direction. The plurality of first coil portions 1120 stacked in the vertical direction may be connected to each other in the vertical direction to form each of the working coils WC.

[0197] In addition, each first coil substrate portion 1100 may have a plurality of first coil portions 1120 arranged in a horizontal direction, and therefore, coil modules 1001, 1003 may include a plurality of working coils WC arranged in a horizontal direction.

[0198] Additionally, according to one embodiment, the coil assembly 1000 may include a sensing coil SC for sensing the presence of an object to be heated, such as... Figures 6 to 7 As shown. Each of the coil modules 1001 and 1003 may include a plurality of sensing coils SC arranged in a horizontal direction. As an example, in the coil assembly 1000, the plurality of sensing coils SC may be arranged in a first direction (i.e., the lateral direction) and the plurality of sensing coils SC may be arranged in a second direction (i.e., the front-back direction).

[0199] Each sensing coil SC can be provided in the form of a spiral coil formed as a pattern on a printed circuit board. That is, the sensing coil SC can be provided in the form of a pattern formed in coil modules 1001, 1003.

[0200] In one embodiment, the coil substrate stack 1010 may include at least one second coil substrate portion 1200. The second coil substrate portion 1200 may be stacked together with the first coil substrate portion 1100 in the vertical direction. That is, at least one second coil substrate portion 1200 and a plurality of first coil substrate portions 1100 may be stacked in the vertical direction to form a coil module 1001, 1003. Therefore, in each of the coil modules 1001, 1003, at least a portion of the working coil WC and the sensing coil SC may be arranged in the vertical direction.

[0201] Each of the second coil substrate portions 1200 may include a second coil portion 1220. As an example, the second coil portion 1220 may be formed as a result of a metal foil stacked on the surface of the second coil substrate portion 1200 being patterned into a spiral coil shape.

[0202] Each sensing coil SC can be formed by a second coil portion 1220, or by connecting multiple second coil portions 1220 stacked in the vertical direction to each other in the vertical direction.

[0203] In addition, each second coil substrate portion 1200 may have a plurality of second coil portions 1220 arranged in a horizontal direction, and therefore, coil modules 1001, 1003 may include a plurality of sensing coils SC arranged in a horizontal direction.

[0204] Additionally, the coil assembly 1000 according to one embodiment may also include a temperature sensor TS. The temperature sensor TS can be provided to measure the temperature of the object to be heated, and the temperature sensor TS can be disposed in the second coil substrate portion 1200.

[0205] The temperature sensor TS can be disposed horizontally inside the sensing coil SC. For example, the temperature sensor TS can be mounted in the second coil substrate 1200 to be disposed in the area surrounded by the sensing coil SC.

[0206] This disclosure describes an embodiment in which the coil assembly 1000 is used in a household appliance. However, in another embodiment, the coil assembly 1000 can be applied to other devices requiring induction heating. For example, the coil assembly 1000 can be installed in a washing machine to heat the water tank, drum, or clothes container inside the washing machine, or to heat the wash water. As another example, the coil assembly 1000 can be installed in a water purifier to heat a hot water pipe or tank. As yet another example, the coil assembly 1000 can be installed in a dryer or clothes dryer to heat air to dry clothes. As yet another example, the coil assembly 1000 can be installed in an electric rice cooker or rice cooker to heat liquids or food inside the device.

[0207] [Layout structure of the coil module]

[0208] Figure 8 This is a plan view showing a first example of the layout structure of the first coil module and the second coil module, and Figure 9 This is a schematic view illustrating an example of the cut state of the original substrate used to form the first coil substrate portion. Furthermore, Figure 10 This is a plan view showing a second example of the layout structure of the first coil module and the second coil module; Figure 11 It is shown Figure 8 A plan view of another example of the layout structure of the first and second coil modules shown; and Figure 12 It is shown Figure 10 A plan view of another example of the layout structure of the first and second coil modules shown. Furthermore, Figure 13 This is a plan view showing a third example of the layout structure of the first coil module and the second coil module, and Figure 14 This is a plan view showing a fourth example of the layout structure of the first coil module and the second coil module. Furthermore, Figure 15 This is a plan view showing a fifth example of the layout structure of the first coil module and the second coil module, and Figure 16 This is a plan view showing a sixth example of the layout structure of the first coil module and the second coil module.

[0209] See Figure 4 and Figure 8 According to one embodiment, a coil assembly 1000 may include a plurality of coil modules 1001, 1003, and the plurality of coil modules 1001, 1003 may be arranged in the coil assembly 1000 along a horizontal direction. For example, in the coil assembly 1000, a plurality of coil modules 1001, 1003 may be arranged along a first direction.

[0210] As described above, the cooktop 100 according to one embodiment may include a control panel 130. The control panel 130 may be disposed in the top panel 120 at a position offset towards the front.

[0211] Relative to the first direction, the control panel 130 can be positioned approximately at the center of the coil assembly 1000. Relative to the second direction, the control panel 130 can be positioned at a position offset towards the front of the coil assembly 1000.

[0212] The coil assembly 1000 is disposed on the underside of the top plate 120, but not on the underside of the area of ​​the top plate 120 occupied by the control panel 130. That is, the working coil WC is disposed only on the underside of the area of ​​the top plate 120 not occupied by the control panel 130, and not on the underside of the area of ​​the top plate 120 occupied by the control panel 130.

[0213] The coil assembly 1000 may include several types of coil modules 1001 and 1003 with different sizes. In this embodiment, coil modules 1001 and 1003 are illustrated as including a first coil module 1001 and a second coil module 1003. The first coil module 1001 may include a plurality of working coils WC, and the second coil module 1003 may include a smaller number of working coils WC than the first coil module 1001.

[0214] In one embodiment, the first coil module 1001 and the second coil module 1003 may be arranged in the coil assembly 1000 along a horizontal direction. Furthermore, the length of the second coil module 1003 may be set to be shorter than the length of the first coil module 1001 relative to the second direction. That is, the second coil module 1003 may be provided in the form of having a shorter second-direction length than the first coil module 1001 and including a fewer number of working coils WC.

[0215] In the 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 spaced apart from each other along the first direction. And at least one second coil module 1003 may be disposed between the pair of first coil modules 1001.

[0216] For example, similar to control panel 130, at least one second coil module 1003 may be disposed at the center of coil assembly 1000 in a first direction. As described above, at least one second coil module 1003 and control panel 130 may be disposed on the same straight line in a second direction.

[0217] Relative to the first direction, the control panel 130 can be disposed between a pair of first coil modules 1001. Additionally, relative to the second direction, the control panel 130 can be disposed at a position offset to one side from the second coil module 1003, for example, in front of the second coil module 1003. Therefore, at least a portion of the control panel 130 can be disposed in the area surrounded by the pair of first coil modules 1001 and second coil module 1003.

[0218] That is, the control panel 130 is positioned where the user can easily see the visual information provided by the control panel 130, and where the user can easily operate the control panel 130. The control panel 130 occupies a predetermined area on the top surface of the cooktop 100.

[0219] Furthermore, since the working coil WC cannot be placed in the area occupied by the control panel 130 on the top surface of the cooktop 100, the working coil WC must be placed in the remaining area besides the area occupied by the control panel 130. Therefore, the coil assembly 1000 with the working coil WC is placed in an area not occupied by the control panel 130 on the top surface of the cooktop 100. For example, the horizontal shape of the coil assembly 1000 can be formed as an inverted version of a "concave" shape.

[0220] The coil assembly 1000 may include coil modules 1001 and 1003 with a working coil WC, wherein the coil modules 1001 and 1003 are of several types and have different lengths in the second direction. In this embodiment, the coil assembly 1000 is illustrated as including two types of coil modules 1001 and 1003, namely a first coil module 1001 and a second coil module 1003.

[0221] As an example, the horizontal shape of coil modules 1001 and 1003 (hereinafter referred to as "the shape of the coil module") can be formed as a rectangle. That is, the shapes of the first coil module 1001 and the second coil module 1003 can be formed as rectangles respectively.

[0222] For example, the second coil module 1003 can be shaped as a rectangle having a second directional length different from that of the first coil module 1001. The second coil module 1003 and the control panel 130 can be arranged on the same straight line in the second direction, and the second coil module 1003 can be arranged on the rear side of the control panel 130.

[0223] Considering that the second coil module 1003 and the control panel 130 are arranged on the same straight line in the second direction, the second direction length of the second coil module 1003 is set to be shorter than the second direction length of the first coil module 1001.

[0224] As described above, the coil assembly 1000 can be made from a combination of multiple coil modules 1001, 1003 arranged in a horizontal direction, and each of the coil modules 1001, 1003 can be formed in a rectangular shape. That is, the coil assembly 1000 may not be formed from a single coil module with an inverted version of a "concave" shape, but rather from a combination of multiple coil modules 1001, 1003 formed in a rectangular shape.

[0225] In one implementation, such as Figure 8 and Figure 9 As shown, the first coil substrate portion 1100 forming each of the coil modules 1001 and 1003 can be formed by a copper clad laminate (CCL), and each copper clad laminate forming each first coil substrate portion 1100 can be provided as a result of cutting the original substrate B (hereinafter referred to as the "original substrate") of the copper clad laminate.

[0226] When the first coil substrate portion 1100 is formed in a concave shape or an inverted concave shape, when the first coil substrate portion 1100 is manufactured by cutting the original substrate P, the loss of the original substrate P is inevitably as much as the amount cut out to ensure space for the control panel 130. That is, when the coil assembly 1000 is formed from a coil module 1001, 1003, there is a problem of increased loss of the original substrate P used to manufacture the first coil substrate portion 1100.

[0227] On the other hand, when the coil assembly 1000 is formed by a combination of multiple coil modules 1001, 1003, each of the coil modules 1001, 1003 can be formed in a rectangular shape. That is, by combining various coil modules 1001, 1003 with different sizes (e.g., first coil module 1001 and second coil module 1003), the coil assembly 1000 can be formed in a concave shape or an inverted version of a concave shape.

[0228] Therefore, when the first coil substrate portion 1100 is manufactured by cutting the original substrate P, the original substrate P can be cut into a rectangular shape, thereby reducing the losses that occur in the original substrate P used to manufacture the first coil substrate portion 1100.

[0229] In one embodiment, the working coil WC can be formed into a shape including a polygon. For example, the horizontal outline of the working coil WC (hereinafter referred to as the "outline of the working coil") can be a polygon.

[0230] As an example, the shape of the working coil WC can be approximately rectangular, and the horizontal shape of the cooktop surface 100 (hereinafter referred to as the "shape of the cooktop surface") is also approximately rectangular. With this in mind, it is preferable that the horizontal shape of the coil modules 1001 and 1003 (hereinafter referred to as the "shape of the coil module") is rectangular.

[0231] Because the coil modules 1001 and 1003 are shaped like rectangles, similar to the shape of the working coil WC, the density of the area occupied by the working coil WC in the coil modules 1001 and 1003 can be effectively increased. Furthermore, because the coil modules 1001 and 1003 are shaped like rectangles, similar to the shape of the cooktop 100, the density of the area occupied by the coil modules 1001 and 1003 in the cooktop 100 can be effectively increased.

[0232] In other words, since the coil modules 1001 and 1003 are shaped into polygons similar to the shape of the working coil WC and the shape of the stove surface 100, the density of the area occupied by the working coil WC in the stove surface 100 can be effectively increased, thereby effectively increasing the range of the area in the stove surface 100 where the container can be heated.

[0233] Therefore, the area of ​​contact between the container and the working coil WC in the cooktop 100 can be increased, thereby effectively improving the heating efficiency of the cooktop 100.

[0234] On the other hand, the length difference between the first coil module 1001 and the second coil module 1003 in the second direction can be adjusted by the difference in the number of working coils WC in the second direction. For example, working coils WC of the same size and shape can be provided to both the first coil module 1001 and the second coil module 1003, and the number of working coils WC in the second direction in the second coil module 1003 can be set to be one less than the number of working coils WC in the second direction in the first coil module 1001.

[0235] In this way, by setting the lengths of the first coil module 1001 and the second coil module 1003 differently to adjust the number of working coils WC, even if the dimensions of the coil modules 1001 and 1003 are changed, it is not necessary to design the size and shape of the working coils WC differently accordingly. That is, various coil modules 1001 and 1003 with different second-direction lengths can be provided in the form of including a working coil WC.

[0236] Therefore, it is possible not only to reduce the cost and time required to design the working coil WC, but also to manufacture various coil modules 1001, 1003 with different second direction lengths more easily and faster at a lower cost.

[0237] In one embodiment, the control panel 130 and the second coil module 1003 may be disposed at the center of the top surface of the stove surface 100 in a first direction, and the first coil module 1001 may be disposed on both sides of the top surface of the stove surface 100 in the first direction.

[0238] As an example, the second directional length of the first coil module 1001 can be set to be approximately similar to the second directional length of the top surface of the cooktop 100. Furthermore, the difference in the second directional length between the first coil module 1001 and the second coil module 1003 can be set to be greater than or equal to the second directional length of the working coil WC.

[0239] Therefore, although most of the top surface of the cooktop 100 can be filled with the working coil WC, it can be ensured that the control panel 130 is placed in the required area on the top surface of the cooktop 100.

[0240] For example, in the 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 spaced apart from each other along the first direction. And a second coil module 1003 may be disposed between the pair of first coil modules 1001.

[0241] For example, similar to control panel 130, a second coil module 1003 may be disposed at the center of coil assembly 1000 in a first direction. As described above, the second coil module 1003 and control panel 130 may be disposed on the same straight line in a second direction.

[0242] In this respect, the number of working coils WC included in each first coil module 1001 and the number of working coils WC included in each second coil module 1003 can be 8 and 6 respectively (see...). Figure 8 ), or 6 and 4 respectively (see Figure 11 ).

[0243] As another example, in such Figure 10 In the coil assembly 1000a shown, 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 a pair of second coil modules 1003a along the first direction, and another pair of first coil modules 1001a can be arranged on the other side of a pair of second coil modules 1003a along the first direction.

[0244] In this respect, the number of working coils WC included in each first coil module 1001a and the number of working coils WC included in each second coil module 1003a can be four and three, respectively (see...). Figure 10 ), or three and two respectively (see Figure 12 ).

[0245] As another example, in coil assembly 1000d, such as Figure 13 As shown, a pair of first coil modules 1001d and a pair of second coil modules 1003d can be configured to be spaced apart along a first direction. A pair of second coil modules 1003d can be disposed between a pair of first coil modules 1001d.

[0246] As another example, in such Figure 14 In the coil assembly 1000e shown, 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.

[0247] In addition, such as Figure 15 As shown, only one pair of first coil modules 1001f can be arranged along the first direction, or as... Figure 16 As shown, only two pairs of first coil modules 1001g can be arranged along the first direction.

[0248] [Structure of the working coil]

[0249] Figure 17 This is a plan view showing an example of the first coil substrate portion according to an embodiment; Figure 18 It is shown Figure 17 An enlarged view of a portion of the first coil substrate shown; and Figure 19 It is shown schematically. Figure 18 A cross-sectional view of the stacked structure of the first coil section is shown. Furthermore, Figure 20 This is a plan view showing an example of the layout structure of the sensing coil, and Figure 21 yes Figure 20 An enlarged view of section "21" shows an example of the layout structure of the sensing coil relative to the operating coil. Furthermore, Figure 22 yes Figure 18 An enlarged view of the first terminal shown. Figure 23 yes Figure 18 An enlarged view of the second terminal shown.

[0250] In one implementation method Figure 8 , Figures 17 to 19 As shown, the working coil WC can be formed of a conductor, more specifically, of electrical conductors stacked in multiple layers. In this embodiment, the first coil portion 1120 (more specifically, the coil pattern Cp, which will be described later) is illustrated as being formed of a conductor.

[0251] The working coil WC can be formed as a result of connecting the first coil portions 1120 to each other in the vertical direction. The first coil portions 1120 are respectively provided to a plurality of first coil substrate portions 1100 stacked in the vertical direction. Each of the first coil substrate portions 1100 may include a core 1110 and a first coil portion 1120.

[0252] The core 1110 can form the frame of the first coil substrate portion 1100 and can be formed of an insulating material. As an example, the core 1110 can be formed of a pre-impregnated material. In this embodiment, the core 1110 is illustrated as being formed of a thermosetting prepreg, more specifically, of FR4 prepreg.

[0253] The first coil portion 1120 can be respectively disposed on both sides of the core 1110 in the vertical direction. For example, each first coil substrate portion 1100 can be provided in such a form that the first coil portion 1120 is formed as a layer on both sides of the core 1110 in the vertical direction.

[0254] As an example, the first coil portion 1120 may be provided in the form of a pattern formed on both sides of the core 1110 in a vertical direction. For example, the first coil substrate portion 1100 may be formed of a copper-clad laminate including the core 1110 and copper foils stacked on both sides of the core 1110 in a vertical direction. In this case, the first coil portion 1120 may be formed as a result of patterning the foils stacked on the core 1110 into a coil shape.

[0255] In one embodiment, the working coil WC can be formed into a shape including a polygon. For example, the horizontal outline of the working coil WC (hereinafter referred to as the "outline of the working coil") can be a polygon.

[0256] Furthermore, as described above, the working coil WC can be formed from a plurality of first coil substrate portions 1100 stacked in the vertical direction. The first coil substrate portion 1100 may include a patterned region 1101 and unpatterned regions 1103, 1105.

[0257] The patterned area 1101 corresponds to the area of ​​the first coil substrate 1100 where the first coil portion 1120 is disposed. Additionally, the unpatterned areas 1103 and 1105 correspond to the areas of the first coil substrate 1100 where 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.

[0258] The unpatterned regions 1103 and 1105 may include a first unpatterned region 1103. In each working coil WC, the first unpatterned region 1103 may be located at the center in the horizontal direction. Alternatively, the first unpatterned region 1103 may be located at the center in the horizontal direction of the first coil substrate portion 1100.

[0259] For example, the first unpatterned region 1103 may be disposed at the horizontal center of each of the working coil WC and the first coil substrate portion 1100. The patterned region 1101 may be disposed to surround the first unpatterned region 1103 on the outer side in the horizontal direction.

[0260] In this embodiment, the term "center" does not refer to an exact center, but rather to the area surrounded by the spirally wound working coil WC, and includes the center of the working coil WC in the diametrical direction and its surroundings.

[0261] At least a portion of the first coil portion 1120 may be horizontally outer-side around unpatterned regions 1103, 1105. As an example, at least a portion of the first coil portion 1120 may be horizontally outer-side around a first unpatterned region 1103.

[0262] The first coil portion 1120 may include at least one coil pattern Cp disposed horizontally outside the first unpatterned region 1103. In each of the first coil portions 1120, each coil pattern Cp may be wound multiple times around the first unpatterned region 1103. The first coil portion 1120 may be formed from at least one coil pattern Cp provided in this form.

[0263] Each of the first coil sections 1120 may include a plurality of coil patterns Cp. In this respect, in each of the first coil sections 1120, the plurality of coil patterns Cp may be arranged to be spaced apart from each other at a predetermined interval along the diametrical direction of the working coil WC.

[0264] For example, each of the first coil portions 1120 may include three to six coil patterns Cp. However, this disclosure is not limited thereto, and each first coil portion 1120 may include more than six coil patterns Cp.

[0265] In this embodiment, each of the first coil sections 1120 is illustrated as comprising three to six coil patterns Cp. Accordingly, in each of the first coil sections 1120, three to six coil patterns Cp can be arranged along the diametrical direction of the working coil WC. The coil patterns Cp provided in each of the first coil sections 1120 can be connected in the vertical direction to any one of the coil patterns Cp provided in the other adjacent first coil sections 1120 in the vertical direction.

[0266] Additionally, the first coil substrate 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 where the first coil portion 1120 is not formed.

[0267] The second unpatterned region 1105 may be disposed outside the first unpatterned region 1103 relative to the horizontal direction. In this embodiment, the second unpatterned region 1105 is illustrated as being disposed outside the first unpatterned region 1103 in a first direction.

[0268] Furthermore, in each of the first coil substrate portions 1100, the first unpatterned region 1103 and the second unpatterned region 1105 are not connected in the horizontal direction. At least a portion of the sensing coil SC can be disposed between the first unpatterned region 1103 and the second unpatterned region 1105, relative to the horizontal direction. That is, at least a portion of the first coil portion 1120 can be disposed between the first unpatterned region 1103 and the second unpatterned region 1105.

[0269] In one embodiment, for each working coil WC, a plurality of second unpatterned regions 1105 may be arranged along a first direction. As an example, a pair of second unpatterned regions 1105 may be provided for each working coil WC. This pair of second unpatterned regions 1105 may be located outside the first unpatterned region 1103 in the first direction. That is, relative to the first direction, the first unpatterned region 1103 may be located between the pair of second unpatterned regions 1105.

[0270] In another embodiment, a plurality of working coils WC may be arranged along a first direction. A plurality of second unpatterned regions 1105 provided to the plurality of working coils WC arranged in this manner may be arranged at equal intervals along the first direction.

[0271] At the same time, such as Figure 6 and Figure 7As shown, the second coil substrate portion 1200 may be disposed above or below the first coil substrate portion 1100, and the sensing coil SC may be formed from the second coil substrate portion 1200. The sensing coil SC may be disposed above or below the first coil substrate portion 1100, and the sensing coil SC may be disposed in the region overlapping with the first coil substrate portion 1100 in the vertical direction.

[0272] like Figure 6 , Figure 7 , Figure 20 and Figure 21 As shown, in each of the coil modules 1001 and 1003, the sensing coil SC can be disposed on the outside of the working coil WC in the vertical direction. For example, in each of the coil modules 1001 and 1003, the sensing coil SC and the working coil WC can be arranged in the vertical direction.

[0273] At least a portion of the sensing coil SC can be disposed in the second unpatterned region 1105 relative to the horizontal direction. Therefore, since the plurality of second unpatterned regions 1105 are disposed at equal intervals along the first direction, the plurality of sensing coils SC can be disposed at equal intervals along the first direction.

[0274] 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. In one embodiment, at least a portion of each sensing coil SC may be disposed in the second unpatterned regions 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.

[0275] In one embodiment, the temperature sensor TS may be disposed inside the sensing coil SC in the horizontal direction. At least a portion of the temperature sensor TS may be disposed in the second unpatterned region 1105 relative to the horizontal direction.

[0276] As an example, the temperature sensor TS can be disposed in the second unpatterned area 1105. That is, the temperature sensor TS mounted on the second coil substrate 1200 and the second unpatterned area 1105 formed on the first coil substrate 1100 can be disposed to overlap each other in the vertical direction.

[0277] Therefore, each sensing coil SC can be positioned at a location where the entire temperature sensor TS can be positioned within the second unpatterned area 1105, that is, the entire temperature sensor TS can be positioned at a location where it overlaps with the second unpatterned area 1105 in the vertical direction.

[0278] At the same time, such as Figure 17 , Figure 18 , Figure 22 and Figure 23 As shown, each first coil section 1120 may include a fourth terminal 1121 and a fifth terminal 1122. The fourth terminal 1121 and the fifth terminal 1122 may be configured to connect multiple coil patterns Cp arranged in a horizontal direction, that is, to form multiple coil patterns Cp of a first coil section 1120.

[0279] Relative to the horizontal direction, the fourth terminal 1121 may be disposed outside the first unpatterned area 1103 and the fifth terminal 1122, and at least a portion of the fifth terminal 1122 may be disposed in contact with the first unpatterned area 1103. Accordingly, relative to the horizontal direction, the second unpatterned area 1105 may be disposed between the fourth terminal 1121 and the fifth terminal 1122.

[0280] Additionally, based on the second unpatterned region 1105, the fourth terminal 1121 may be disposed in the horizontal outer region of the first coil portion 1120, and the fifth terminal 1122 may be disposed in the horizontal inner region of the first coil portion 1120.

[0281] As an example, the fourth terminal 1121 may be located on the outermost side of the first coil portion 1120 in the horizontal direction, and the fifth terminal 1122 may be located on the innermost side of the first coil portion 1120 in the horizontal direction. For example, the fourth terminal 1121 may be connected to the outermost end of the coil pattern Cp in the horizontal direction, and the fifth terminal 1122 may be connected to the innermost end of the coil pattern Cp.

[0282] See Figure 6 and Figure 20 According to one embodiment, the coil assembly 1000 may further include a terminal portion 1020. The terminal portion 1020 may be connected to at least one of a fourth terminal 1121 and a fifth terminal 1122. A detailed description of the terminal portion 1020 will be provided later.

[0283] [Layout structure of the working coils in each coil module]

[0284] like Figure 8 As shown, in each of the coil modules 1001 and 1003, multiple working coils WC can be arranged horizontally. For example, in each of the coil modules 1001 and 1003, multiple working coils WC can be arranged along a first direction and also along a second direction. That is, in each of the coil modules 1001 and 1003, multiple working coils WC can be arranged in a matrix.

[0285] In this case, each working coil WC can be configured to be spaced apart from another working coil WC adjacent to it in the first direction by a predetermined interval, and can also be configured to be spaced apart from another working coil WC adjacent to it in the second direction by a predetermined interval.

[0286] In one embodiment, the length of 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 of coil modules 1001 and 1003 can be formed into a rectangular shape, wherein the rectangular shape can have a second direction length that is longer than the length in the first direction.

[0287] In contrast, the length of the working coil WC in the second direction can be set to be shorter than the length of the working coil WC in the first direction. That is, each working coil WC can be formed into a rectangular shape, wherein the rectangular shape can have a first direction length that is longer than the second direction length.

[0288] In each of the coil modules 1001 and 1003 that include these working coils WC, the number of working coils WC arranged on the same straight line in the second direction is greater than the number of working coils WC arranged on the same straight line in the first direction.

[0289] In one embodiment, the first coil module 1001 may include a plurality of working coils WC arranged in column A × row B, and the second coil module 1003 may include a plurality of working coils WC arranged in column A × row C. In this embodiment, a column is defined as a line along a first direction, and a row is defined as a line along a second direction.

[0290] As an example, the relationship between A, B, and C can be defined as follows: A≥1, C≥2, B>C For example, in the first coil module 1001 and the second coil module 1003, one or more working coils WC can be arranged along the first direction, and two or more working coils WC can be arranged along the second direction. Additionally, in the first coil module 1001, one or more working coils WC can be arranged along the first direction, and three or more working coils WC can be arranged along the second direction.

[0291] Accordingly, the number of working coils WC arranged on the same straight line in the first direction in the first coil module 1001 and the number of working coils WC arranged on the same straight line in the first direction in the second coil module 1003 can be set to be equal to each other. Alternatively, the number of working coils WC arranged on the same straight line in the second direction in the second coil module 1003 can be set to be less than the number of working coils WC arranged on the same straight line in the second direction in the first coil module 1001.

[0292] As an example, when n first coil modules 1001 are spaced apart along a first direction, n / 2 second coil modules 1003 can be disposed between a pair of first coil modules 1001 disposed on the innermost side of the first direction.

[0293] In this configuration, each first coil module 1001 may include 16 / n working coils WC arranged in a 4 / n column × 4 row configuration. And each second coil module 1003 may include 12 / n working coils WC arranged in a 4 / n column × 3 row configuration.

[0294] For example, when two first coil modules 1001 are spaced apart along a first direction, a second coil module 1003 may be disposed between the pair of first coil modules 1001 disposed on the innermost side of the first direction. In this case, each of the first coil modules 1001 may include eight working coils WC arranged in a 2-column × 4-row configuration.

[0295] Furthermore, each second coil module 1003 may include six working coils WC arranged in a 2-column × 3-row configuration. In this case, the coil assembly 1000 may include a total of 22 working coils WC.

[0296] As mentioned above, the stovetop 100 (see Figure 3 Multiple indicator lights L can be set (see...) Figure 3 ), and the indicator light L can be supplied by the lighting module 180 (see Figure 4 The illumination module 180 can be disposed on the underside of the coil assembly 1000, and the light emitted from the illumination module 180 can pass through the coil assembly 1000 to illuminate the light display area of ​​the top plate 120.

[0297] To allow light emitted from the illumination module 180 to be transmitted to the light display area of ​​the top plate 120, each of the coil modules 1001 and 1003 may be provided with a via h. In each coil module 1001 and 1003, the via h can penetrate the coil module 1001 and 1003 in the vertical direction, and each via h can be provided between a row of working coils WC.

[0298] like Figure 10 As shown, if the four first coil modules 1001a are arranged to be spaced apart from each other along a first direction, then two second coil modules 1003a can be arranged between the pair of first coil modules 1001a located at the innermost end of the first direction. In this case, each of the first coil modules 1001a can include four working coils WC arranged in a column × row configuration.

[0299] When the coil assembly 1000a is provided in the manner described above, a space can be formed between the columns in the coil assembly 1000a. This space can be used as a channel to allow light emitted from the illumination module 180 to be transmitted to the light display area of ​​the top plate 120.

[0300] That is, by providing each of the coil modules 1001a and 1003a in the form of only one column of working coils WC, it is not necessary to form a separate via in the coil assembly 1000a.

[0301] Furthermore, considering that its own size, or the size of the display or control panel, can vary for each model, the coil assembly 1000a provided in the above form may be more suitable for mass production than... Figure 8 The coil assembly shown is more advantageous.

[0302] For example, according to the coil assembly 1000a provided in the above form, when several products with displays or control panels of different sizes are produced, the first coil module 1001a can be used together, while only the size of the second coil module 1003a is changed according to the size of the display or control panel.

[0303] Furthermore, according to the coil assembly 1000a provided in the above form, when necessary, it is sufficient to repair or replace only one row for each coil module 1001a, 1003a, thus making maintenance easier and reducing maintenance costs.

[0304] Furthermore, if each coil module 1001a, 1003a is provided in the form of including only one column of working coils WC as described above, the surface area of ​​each coil module 1001a, 1003a can be relatively widened compared to the form in which each coil module includes two columns of working coils WC, and air can flow in each space between the coil modules 1001a, 1003a, thereby improving the heat dissipation performance of the coil assembly 1000a.

[0305] In comparison, in such Figure 8When two or more columns of working coils WC are set at each coil module 1001, 1003, the number of coil modules 1001, 1003 to be assembled is reduced compared to the case where only one column of working coils WC is set in each coil module, thus reducing the assembly time.

[0306] Furthermore, when two or more columns of working coils WC are arranged in each of the coil modules 1001 and 1003, the space required to form wiring between two adjacent columns of working coils WC can be easily fixed in the coil modules 1001 and 1003, thus having the advantage of being able to easily and effectively perform wiring design.

[0307] Furthermore, each second coil module 1003a may include three working coils WC arranged in a column × 3 row configuration. Similarly, in this case, the coil assembly 1000a may include a total of 22 working coils WC.

[0308] As a second example, such as Figure 11 As shown, each first coil module 1001b may include 12 / n working coils WC arranged in a 4 / n column × 3 row format. And each second coil module 1003b may include 8 / n working coils WC arranged in a 4 / n column × 2 row format.

[0309] For example, when two first coil modules 1001b are spaced apart along a first direction, a second coil module 1003b may be disposed between the pair of first coil modules 1001b disposed on the innermost side of the first direction. In this case, each of the first coil modules 1001b may include six working coils WC arranged in a 2-column × 3-row configuration.

[0310] Each of the second coil modules 1003b may include four working coils WC arranged in a 2-column × 2-row configuration. In this case, the coil assembly 1000b may include a total of 16 working coils WC.

[0311] like Figure 12 As shown, if the four first coil modules 1001c are arranged to be spaced apart from each other along the first direction, then the two second coil modules 1003c can be arranged between the pair of first coil modules 1001c arranged at the innermost side of the first direction.

[0312] In this configuration, each of the first coil modules 1001c may include three working coils WC arranged in a 1-column × 3-row configuration. And each of the second coil modules 1003c may include two working coils WC arranged in a 1-column × 2-row configuration. Similarly, in this configuration, the coil assembly 1000c may include a total of 16 working coils WC.

[0313] As a third example, such as Figure 13 As shown, when two first coil modules 1001d are spaced apart from each other along a first direction, two second coil modules 1003d can be disposed between the pair of first coil modules 1001d disposed on the innermost side of the first direction. In this case, each of the first coil modules 1001d may include ten working coils WC arranged in a 2-column × 5-row configuration.

[0314] Furthermore, each second coil module 1003d may include six working coils WC arranged in a 2-column × 3-row configuration. In this case, the coil assembly 1000d may include a total of 32 working coils WC.

[0315] As a fourth example, such as Figure 14 As shown, if the four first coil modules 1001e are arranged to be spaced apart from each other along a first direction, then the four second coil modules 1003e can be arranged between the pair of first coil modules 1001e located at the innermost end of the first direction. In this case, each of the first coil modules 1001e may include five working coils WC arranged in a column × row configuration.

[0316] Each of the second coil modules 1003e may include three working coils WC arranged in a column × 3 row configuration. Similarly, in this case, the coil assembly 1000e may include a total of 32 working coils WC.

[0317] As a fifth example, such as Figure 15 As shown, when n first coil modules 1001f are arranged to be spaced apart from each other along a first direction, each first coil module 1001f may include 16 / n working coils WC arranged in the form of 4 / n columns × 4 rows.

[0318] For example, when two first coil modules 1001f are arranged to be spaced apart from each other along a first direction, each first coil module 1001f may include eight working coils WC arranged in a 2-column × 4-row configuration. In this case, the coil assembly 1000f may include a total of 16 working coils WC.

[0319] like Figure 16 As shown, if the four first coil modules 1001g are arranged to be spaced apart from each other along a first direction, each first coil module 1001g may include four working coils WC arranged in a column × 4 rows. Similarly, in this case, the coil assembly 1000g may include a total of 16 working coils WC.

[0320] In the example above, the coil assembly may include working coils WC all having the same size and shape. Alternatively, the coil assembly may include several working coils WC with different sizes and shapes.

[0321] Figure 24 This is a plan view showing a seventh example of the layout structure of the first coil module and the second coil module.

[0322] As another example, such as Figure 24 The coil assembly 1000h shown 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 may be arranged on the same straight line in the second direction, and the second coil module 1003 and the fourth coil module 1007 may be arranged on the same straight line in the second direction.

[0323] Accordingly, a pair of first coil modules 1001 can be configured to be spaced apart from each other along the first direction, with a second coil module 1003 and a fourth coil module 1007 inserted between them.

[0324] Furthermore, relative to the second direction, the first coil module 1001 may protrude to one side more than the second coil module 1003; the third coil module 1005 may be positioned to one side more than the first coil module 1001; and the fourth coil module 1007 may be positioned to one side more than the second coil module 1003.

[0325] That is, the first coil module 1001, whose length in the second direction is greater than that of the second coil module 1003, protrudes further forward than the second coil module 1003; the third coil module 1005 can be positioned further forward than the first coil module 1001; and the fourth coil module 1007 can be positioned further forward than the second coil module 1003. Of course, the third coil module 1005 can be positioned further forward than the fourth coil module 1007.

[0326] The third coil module 1005 and the fourth coil module 1007 can be configured to have a smaller horizontal dimension than the first coil module 1001 and the second coil module 1003. Therefore, the third coil module 1005 may include a working coil with a horizontal dimension smaller than the horizontal dimension of the working coil provided to the first coil module 1001.

[0327] As described above, the control panel 130 can be positioned further forward than the second coil module 1003, and the pair of first coil modules 1001 can be spaced apart from each other along a first direction, with the control panel 130 inserted between the first coil modules 1003. Additionally, the pair of third coil modules 1005 positioned in front of the pair of first coil modules 1001 can also be spaced apart from each other along the first direction, with the control panel 130 inserted between them.

[0328] The length of the third coil module 1005 can be set to be shorter than the length of the first coil module 1001 relative to the first direction. And the length of the third coil module 1005 can be set to be shorter than the length of the first coil module 1001 relative to the second direction. That is, the third coil module 1005 can be configured to have a first-direction length and a second-direction length that are both shorter than the first coil module 1001's first-direction length and second-direction length.

[0329] Additionally, the fourth coil module 1007 can be disposed on the rear side of the control panel 130. Relative to the second direction, the fourth coil module 1007 can be disposed between the control panel 130 and the second coil module 1003, and the length of the fourth coil module 1007 can be made shorter than the length of the second coil module 1003.

[0330] Because the third coil module 1005 and the fourth coil module 1007 are arranged in the manner described above, a wider area can be ensured for the area used to set the control panel 130. Accordingly, the control panel 130 can be further spaced horizontally from the coil modules 1001 and 1003, and thus, the control panel 130 can be less affected by the heat generated around the working coil WC.

[0331] [Power Supply Configuration]

[0332] Figure 25 This is a block diagram schematically illustrating the power-related configuration of a household appliance according to an embodiment. Figure 26 This is a circuit diagram of a household appliance according to one embodiment.

[0333] Reference Figure 25 According to the embodiments, the household appliance may include a control panel 130, a drive circuit 300, a load circuit 350, a controller 500, and a sensing coil SC.

[0334] A user interface can be presented to the control panel 130, which includes various icons for adjusting the operation of the cooktop 100 by touch, a display showing the operating status of the cooktop 100, etc. The user can input the desired heating level through the control panel 130.

[0335] The load circuit 350 may include at least one operating coil, at least one capacitor, and at least one relay. Here, the at least one operating coil, at least one capacitor, and at least one relay may be selectively connected in series or in parallel with each other.

[0336] The drive circuit 300 can provide switching signals for driving the inverter included in the load circuit 350.

[0337] The household appliance according to the embodiment may also include a current measuring circuit 400. When the inverter included in the load circuit 350 is driven, the current measuring circuit 400 can measure the resonant current Ir and resonant voltage Vr of the load circuit 350. The controller 500 can use the resonant current Ir and resonant voltage Vr to calculate the input current applied to the load circuit 350. The controller 500 can calculate the output power value of the operating coil based on the input current, and determine the drive frequency of the inverter included in the load circuit 350 based on the calculated output power value and the heating level input via the control panel 130.

[0338] The controller 500 can provide the drive circuit 300 with a control signal corresponding to the determined drive frequency. The drive circuit 300 can generate a switching signal based on the control signal provided by the controller 500 and provide the switching signal to the load circuit 350.

[0339] The controller 500 can determine whether a container is on top of a working coil by using a sensing coil SC. The controller 500 can supply current to the sensing coil SC for a predetermined time period. The controller 500 can determine whether a container is on top of a working coil, or which working coil the container is on, based on the resonant signal output by the sensing coil SC through the current supply.

[0340] In one embodiment, the controller 500 can determine container information using a sensing coil SC, the container information including at least one of the container's location, material, shape, and size. The controller 500 can then control at least one relay in the load circuit 350 based on the container's location, such that at least one operating coil corresponding to the container's location is activated.

[0341] In addition, the controller 500 can determine or change the switching frequency of the inverter based on at least one of the material, shape and size of the container.

[0342] Reference Figure 25 According to the embodiments, the household appliance may include a rectifier circuit Rc, a DC link capacitor CD, an inverter INV, a sensing coil SC, a controller 500, a drive circuit 300, a working coil WC, and a resonant capacitor Cr.

[0343] The rectifier circuit Rc rectifies the input voltage supplied from the external power supply Ps and outputs the rectified voltage. The rectifier circuit Rc can be a circuit that includes multiple diodes (e.g., a bridge circuit).

[0344] The DC link capacitor CD can smooth the voltage output from the rectifier circuit Rc and output the smoothed voltage.

[0345] The inverter INV can output AC current using the voltage output from the DC link capacitor CD. In one embodiment, the inverter INV may include a first switching element SW1 and a second switching element SW2. The first switching element SW1 and the second switching element SW2 can be turned on and off by a first switching signal S1 and a second switching signal S2 provided by the drive circuit 300. The first switching element SW1 and the second switching element SW2 can be turned on and off alternately. In another embodiment, the inverter INV may include two or more switching elements.

[0346] The controller 500 can determine whether a container is on top of a working coil by using a sensing coil SC. The controller 500 can supply current to the sensing coil SC for a predetermined time period. The controller 500 can determine whether a container is on top of a working coil, or which working coil the container is on, based on the resonant signal output by the sensing coil SC through the current supply.

[0347] The controller 500 can determine the drive frequency of the inverter included in the load circuit 350 based on the output power value of the working coil WC and the heating level input via the control panel 130. The controller 500 can provide a control signal to the drive circuit 300 corresponding to the drive frequency of the inverter INV. When the control signal is provided to the drive circuit 300, the drive circuit 300 can output switching signals S1 and S2. When the first switching signal S1 and the second switching signal S2 are provided to the inverter INV, the first switching element SW1 and the second switching element SW2 can be alternately switched on and off. Thus, an alternating current can be output from the inverter INV. When the alternating current output from the inverter INV is provided to the working coil WC, the container positioned on top of the working coil WC can be heated.

[0348] The resonant capacitor Cr can be connected to one end of the working coil WC. When alternating current is supplied to the working coil WC, resonance may occur due to the working coil WC, the resonant capacitor Cr, and the capacitor.

[0349] exist Figure 26In the example shown, only one working coil WC and one resonant capacitor Cr are illustrated. However, in another embodiment, the household appliance may include multiple working coils and resonant capacitors.

[0350] [Stacked structure of coil substrate stack]

[0351] Reference Figure 7 and Figure 8 Each of the coil modules 1001 and 1003 can be formed by a coil substrate stack 1010. The coil substrate stack 1010 may include a plurality of first coil substrate portions 1100 and at least one second coil substrate portion 1200 stacked in the vertical direction.

[0352] like Figure 7 and Figure 19 As shown, the first coil substrate portion 1100 can be formed in a configuration where the core 1110 and the first coil portion 1120 are stacked in the vertical direction. The second coil substrate portion 1200 can be formed in a configuration where the core 1210 and the second coil portion 1220 are stacked in the vertical direction. The core 1210 can form the frame of the second coil substrate portion 1200 and can be formed of the same or similar material as the core 1110 of the first coil substrate portion 1100.

[0353] For example, in the first coil substrate portion 1100, the first coil portion 1120 may be disposed on both sides of the core 1110 in the vertical direction. For example, the first coil portion 1120 may be stacked on the top surface and bottom surface of the core 1110 respectively.

[0354] Furthermore, in the second coil substrate portion 1200, the first coil portion 1120 can be disposed on one side in the vertical direction, that is, on the lower side of the core 1210, and the second coil portion 1220 can be disposed on the other side in the vertical direction, that is, on the upper side of the core 1210. For example, the first coil portion 1120 can be stacked on the bottom surface of the core 1210, and the second coil portion 1220 can be stacked on the top surface of the core 1210.

[0355] As another example, in the second coil substrate portion 1200, the second coil portion 1220 may be disposed on both sides of the core 1210 in the vertical direction.

[0356] This embodiment shows that the second coil substrate portion 1200 includes a first coil portion 1120 and a second coil portion 1220, wherein the first coil portion 1120 is disposed on the lower side of the core 1210, and the second coil portion 1220 is disposed on the upper side of the core 1210.

[0357] In one embodiment, the working coil WC (more specifically, the coil substrate stack 1010) may include six or more layers of first coil portions 1120. That is, the coil substrate stack 1010 may include six or more layers of first coil portions 1120, which are connected to each other in the vertical direction and are integrally connected to each other.

[0358] To ensure sufficient induced power from the working coil WC to heat the object, the number of conductors included in the working coil WC must be adequately ensured. There are limitations to increasing the height of the coil pattern Cp to increase the number of conductors included in the working coil WC.

[0359] With this in mind, increasing the number of coil patterns Cp in each layer forming the working coil WC and increasing the number of layers of coil patterns Cp forming the working coil WC can be an effective method for increasing the number of conductors included in the working coil WC.

[0360] In one implementation, three or more coil patterns Cp connected in parallel for each layer can be arranged along the diametrical direction of the working coil WC to form a coil line. The coil lines formed in this way can be stacked up to three or more times, thus overlapping each other in the vertical direction to form the working coil WC.

[0361] Considering the winding spacing of the coil pattern Cp or other design conditions, there are limitations on increasing the number of coil patterns Cp in each layer. For example, if the number of coil patterns Cp in each layer increases, the size of each working coil WC may increase, which could lead to the problem that the number of working coils WC installed in household appliances must be reduced.

[0362] In addition, 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. This may lead to the problem that, although the number of coil patterns Cp increases, the number of conductors included in the working coil WC is reduced considerably.

[0363] In comparison, increasing the number of layers in the coil pattern Cp can be considered a method that causes relatively fewer problems. That is, as the number of layers in the coil pattern Cp increases, the number of conductors included in the working coil WC can also increase, and despite the increase in the number of layers in the coil pattern Cp, there is almost no concern that the number of working coils WC or the number of conductors included in the working coil WC will decrease.

[0364] With this in mind, in this embodiment, since three or more coil patterns Cp are provided for each layer, three layers of coil patterns Cp are provided in the vertical direction to form three layers of coil lines. In addition, considering that when three layers of coil lines (e.g., the first coil line) are provided, another three layers of coil lines (e.g., the second coil line) with a different pattern from the aforementioned coil lines must be provided, it is preferable that the coil substrate stack 1010 includes six or more layers of coil lines.

[0365] Furthermore, depending on the design conditions, the number of conductors included in the working coil WC can be increased more effectively by stacking the coil wires into eight or more layers. This embodiment shows eight to twelve layers of the first coil portion 1120 stacked in the vertical direction. However, this disclosure is not limited to this, and the first coil portion 1120 can be stacked in more than twelve layers.

[0366] As an example, coil modules 1001 and 1003 can be designed such that as the number of layers of the first coil portion 1120 increases, the thickness of each layer of the first coil portion 1120 decreases, and thus the increase in the total thickness of coil modules 1001 and 1003 can be suppressed to an appropriate level despite the increase in the number of layers of the first coil portion 1120.

[0367] Additionally, the coil substrate stack 1010 may include at least one second coil portion 1220. For example, the coil substrate stack 1010 may include 8 to 12 layers of first coil portions 1120 and 1 to 2 layers of second coil portions 1220, which are connected to each other in the vertical direction and are integrated with each other.

[0368] Additionally, the coil substrate stack 1010 may also include an insulating layer stacked together with the first coil portion 1120 in the vertical direction. In each coil substrate stack 1010, the coil portions 1120, 1220 and the insulating layer may be alternately arranged in the vertical direction.

[0369] In the first coil substrate portion 1100, the insulating layer may be formed from the core 1110. Furthermore, in the second coil substrate portion 1200, the insulating layer may be formed from the core 1210.

[0370] Additionally, an insulating layer may be provided between the coil substrate portions 1100 and 1200. For example, the insulating layer may be provided between a pair of first coil substrate portions 1100 that are adjacent to each other in the vertical direction, and the insulating layer may also be provided between the first coil substrate portion 1100 and the second coil substrate portion 1200. Alternatively, the insulating layer may also be provided between a pair of second coil substrate portions 1200 that are adjacent to each other in the vertical direction.

[0371] For example, the insulating layer disposed between the coil substrate portions 1100 and 1200 as described above can be formed of adhesive material 1400. In one embodiment, a plurality of first coil substrate portions 1100 stacked in the vertical direction can be connected to each other by adhesive material 1400, and the first coil substrate portions 1100 and second coil substrate portions 1200 can also be connected to each other by adhesive material 1400. Furthermore, a plurality of second coil substrate portions 1200 stacked in the vertical direction can be connected to each other by adhesive material 1400.

[0372] Accordingly, the insulating layer may be formed from cores 1110 and 1210 respectively disposed in the first coil substrate portion 1100 and the second coil substrate portion 1200 (hereinafter referred to as "coil substrate portion"), and the insulating layer may also be formed from adhesive material 1400 disposed between the coil substrate portions 1100 and 1200.

[0373] Cores 1110 and 1210 may be disposed between a pair of first coil portions 1120 or second coil portions 1220, or between the first coil portions 1120 and the second coil portions 1220, with the first coil portions 1120 and the second coil portions 1220 facing each other in the vertical direction to form an insulating layer between them. That is, the cores 1110 and 1210 may form an insulating layer inside the first coil substrate portion 1100 or inside the second coil substrate portion 1200.

[0374] 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, to form an insulating layer therebetween. That is, the adhesive material 1400 can form an insulating layer on the outside of the first coil substrate portion 1100 or the second coil substrate portion 1200.

[0375] Therefore, either the first coil portion 1120 or the second coil portion 1220 (hereinafter referred to as "coil portion") and the insulating layer can be alternately arranged in the vertical direction. That is, the first coil portion 1120 and the insulating layer can be alternately arranged in the vertical direction, and the second coil portion 1220 and the insulating layer can be alternately arranged.

[0376] Furthermore, among the multiple insulating layers arranged in the vertical direction, the cores 1110 and 1210 and the adhesive material 1400 can be alternately arranged in the vertical direction. For example, the coil portions 1120 and 1220 and the insulating layers can be stacked in the vertical direction in the order of "...first coil portion 1120—core 1110—first coil portion 1120—adhesive material 1400—first coil portion 1120...".

[0377] In this embodiment, each of the coil substrate portions 1100 and 1200 is illustrated as being formed of a copper-clad laminate including cores 1110 and 1210 and foil. Accordingly, the cores 1110 and 1210 may be formed of a thermosetting prepreg.

[0378] As an 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 stacked on cores 1110 and 1210 being patterned into coil shapes. The thickness adjustment of the first coil substrate portion 1100 or the second coil substrate portion 1200 can be performed by changing the thickness of core 1110 or changing the thickness of the first coil portion 1120 or the second coil portion 1220.

[0379] Additionally, the adhesive material 1400 can be formed from a prepreg material. As an 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.

[0380] The thickness of the adhesive material 1400 can be set to be thicker than that of the cores 1110 and 1210. In one embodiment, both the cores 1110 and 1210 and the adhesive material 1400 are formed of prepreg; however, the cores 1110 and 1210 are formed of thermosetting prepreg, while the adhesive material 1400 is formed of non-thermosetting prepreg. With this in mind, in this embodiment, the adhesive material 1400 can be formed to be thicker than the cores 1110 and 1210, so that the strength of the adhesive material 1400 can be maintained at a similar level to that of the cores 1110 and 1210, and the strength of the coil modules 1001 and 1003 can be enhanced.

[0381] Furthermore, the thickness of the adhesive material 1400 can be set to be greater than the thickness of the coil portions 1120 and 1220. As an example, the thickness of the adhesive material 1400 can be set to be more than twice the thickness of the coil portions 1120 and 1220. The adhesive material 1400 formed as described above can help enhance the strength of the coil portions 1120 and 1220 disposed on both sides of the adhesive material 1400 in the vertical direction.

[0382] Additionally, the coil assembly 1000 according to one embodiment may further include outer layer portions 1300 and 1350. The outer layer portions 1300 and 1350 may be disposed on the outer side of the coil substrate stack 1010 in the vertical direction. As an example, the outer layer portions 1300 and 1350 may be disposed on the upper and lower sides of the coil substrate stack 1010, respectively, and a pair of outer layer portions 1300 and 1350 disposed in this manner may be stacked together with the coil substrate stack 1010 in the vertical direction. These outer layer portions 1300 and 1350 stacked together with the coil substrate stack 1010 as described above may form the upper and lower ends of the coil modules 1001 and 1003.

[0383] The outer layer portions 1300 and 1350 can be divided into a first outer layer portion 1300 and a second outer layer portion 1350. Similar to the first coil portion 1120, the first outer layer portion 1300 may include a plurality of first coil portions 1120 arranged in a horizontal direction. And, similar to the second coil portion 1220, the second outer layer portion 1350 may include a plurality of second coil portions 1220 arranged in a horizontal direction.

[0384] The first outer layer portion 1300 can form a working coil WC together with a plurality of first coil portions 1120, which are stacked in the vertical direction. Additionally, the second outer layer portion 1350 can form a working coil WC together with a second coil portion 1220. That is, the first outer layer portion 1300 can be connected to the first coil portion 1120 in the vertical direction, and the second outer layer portion 1350 can be connected to the second coil portion 1220 in the vertical direction.

[0385] The first outer layer portion 1300 may be disposed at a position adjacent to the first coil substrate portion 1100. As an example, the first outer layer portion 1300 may be disposed on the lower side of the first coil substrate portion 1100 to be connected to the first coil portion 1120 in the vertical direction. The first outer layer portion 1300 and the first coil portion 1120 may together form a working coil WC.

[0386] The second outer layer portion 1350 may be disposed at a position adjacent to the second coil substrate portion 1200. As an example, the second outer layer portion 1350 may be disposed on the upper side of the second coil substrate portion 1200 to be connected to the second coil portion 1220 in the vertical direction. The second outer layer portion 1350 may form a sensing coil SC together with the second coil portion 1220.

[0387] For example, the coil substrate stack 1010 may be formed in such a way that the second coil portion 1220 is stacked on top of a plurality of first coil portions 1120. And the coil substrate stack 1010 may be disposed between the first outer layer portion 1300 and the second outer layer portion 1350, the first outer layer portion 1300 and the second outer layer portion 1350 being spaced apart from each other in the vertical direction.

[0388] In this configuration, the first outer layer portion 1300 disposed on the lower side of the first coil substrate portion 1100 can form the lower end of the coil modules 1001 and 1003, and together with the first coil portion 1120, form the working coil WC. Additionally, the second outer layer portion 1350 disposed on the upper side of the second coil substrate portion 1200 can form the upper end of the coil modules 1001 and 1003, and together with the second coil portion 1220, form the sensing coil SC.

[0389] In one embodiment, a pair of coil portions 1120, 1220 are disposed in each of the coil substrate portions 1100, 1200 in a vertical direction. That is, two layers of coil portions 1120, 1220 are formed on each of the coil substrate portions 1100, 1200. The coil substrate stack 1010 formed in the form of stacking multiple coil substrate portions 1100, 1200 may include multiple coil portions 1120, 1220, and more specifically, may include an even number of layers of coil portions 1120, 1220.

[0390] In addition, the outer layers 1300 and 1350 can be combined to the upper and lower sides of the coil substrate stack 1010 formed as described above, and thus, a plurality of coil portions 1120 and 1220 can be provided in each of the coil modules 1001 and 1003, and more specifically, an even number of coil portions 1120 and 1220 can be provided.

[0391] The outer layers 1300 and 1350 can be bonded to the coil substrate stack 1010 using 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 bond the coil substrate stack 1010 to the outer layers 1300 and 1350.

[0392] As an example, the adhesive material 1400 disposed between the first coil substrate portion 1100 and the first outer layer portion 1300 (disposed in the lower end of the coil modules 1001, 1003) can form an insulating layer between the first coil portion 1120 disposed to the first coil substrate portion 1100 and the first coil portion 1120 disposed to the first outer layer portion 1300, and the first coil substrate portion 1100 and the first outer layer portion 1300 can be combined.

[0393] Furthermore, the adhesive material 1400 disposed between the second coil substrate portion 1200 and the second outer layer portion 1350 (disposed in the upper end of the coil modules 1001, 1003) can form an insulating layer between the second coil portion 1220 disposed to the second coil substrate portion 1200 and the second coil portion 1220 disposed to the second outer layer portion 1350, and can combine the second coil substrate portion 1200 with the second outer layer portion 1350.

[0394] In this embodiment, a coil substrate stack 1010, a working coil WC, and a sensing coil SC are formed by stacking units such as coil substrate portions 1100, 1200, coil portions 1120, and 1220, but this disclosure is not limited thereto.

[0395] As another example, the working coil WC and coil modules 1001, 1003 can be formed in such a way that the conductors of each layer are stacked sequentially from the bottom layer without the need for a separate substrate. In this case, the coil modules 1001, 1003 can be formed in such a way that the conductors and adhesive material 1400 used to form the working coil WC are stacked alternately in the vertical direction.

[0396] Furthermore, in the above description, the coil modules 1001 and 1003 are formed in a stacked form, consisting of various parts constituting the coil modules 1001 and 1003, such as coil substrate parts 1100 and 1200, coil parts 1120 and 1220, conductors, etc. However, the coil modules 1001 and 1003 are formed in a form in which the various parts constituting the coil modules 1001 and 1003 are integrated into one unit.

[0397] That is, according to one embodiment, the coil modules 1001 and 1003 are formed as a single unit and are not divided into separate components constituting the coil modules 1001 and 1003, unless a separate process such as cutting or chemical treatment is performed.

[0398] [Shape of the working coil]

[0399] Figure 27 This is a plan view showing an example of a working coil.

[0400] See Figure 17 and Figure 27The working coil WC can be formed into a shape that includes polygons. For example, the horizontal shape of the working coil WC can be polygonal. In other words, when the working coil WC is viewed from above, its shape can be polygonal.

[0401] As an example, the working coil WC can be approximately rectangular in shape. Alternatively, the coil modules 1001 and 1003, including the working coil WC, can also be polygonal in shape. Furthermore, the working coil WC can be formed from a conductor with a pattern formed on the insulating layer. For example, the working coil WC can be formed from a conductor with a pattern formed on the insulating layer, rather than a tightly wound Ritz coil.

[0402] Since the working coil WC is formed in the pattern described above, the shape of the working coil WC can be easily formed into a polygonal shape, more specifically, an approximate rectangular shape.

[0403] In addition, since the working coil WC is shaped in this way, the working coil WC can occupy a region very close to the edge of the coil modules 1001 and 1003, thereby effectively increasing the density of the region occupied by the working coil WC in the coil modules 1001 and 1003.

[0404] Furthermore, the horizontal shape (hereinafter referred to as "the shape of the first coil substrate portion") of each first coil substrate portion 1100 provided on each working coil WC can be polygonal. For example, the shape of the first coil substrate portion 1100 can be approximately rectangular.

[0405] In addition, the horizontal shape of the core 1110 forming the frame of each first coil substrate portion 1100 (hereinafter referred to as the "shape of the core") can be a polygonal shape, similar to the shape of the coil modules 1001, 1003 and the first coil substrate portion 1100.

[0406] As an example, the working coil WC can be formed into a rectangular spiral shape. For instance, the working coil WC can be formed into a rectangular spiral shape, wherein a first straight line L1 in a first direction and a second straight line L2 in a second direction are alternately connected to each other. Furthermore, the shape of the core 1110 of the first coil substrate portion 1100 forming the working coil WC can be formed into a rectangular shape similar to the shape of the working coil WC.

[0407] Therefore, at least one of the outermost edges of the working coil WC may include a straight line parallel to any one of the outermost edges of the core 1110. For example, the first straight line L1 located at the foremost part of the working coil WC may be formed as a straight line parallel to the front outermost edge of the core 1110, and the second straight line L2 located at the rightmost part of the working coil WC may be formed as a straight line parallel to the right outermost edge of the core 1110.

[0408] Since the shape of the core 1110 and the shape of the working coil WC are formed in the above manner, the working coil WC can occupy a region very close to the edge of the coil modules 1001 and 1003, thereby effectively increasing the density of the region occupied by the working coil WC in the coil modules 1001 and 1003.

[0409] Furthermore, in one embodiment, each of the coil modules 1001 and 1003 may include a plurality of working coils WC. That is, each of the coil modules 1001 and 1003 may include an assembly of a plurality of working coils WC arranged in a horizontal direction. For example, each of the coil modules 1001 and 1003 may be provided with an assembly of working coils WC, which includes eight working coils WC arranged in a 2-column × 4-row configuration along a horizontal direction.

[0410] In one embodiment, the shape of the components of the working coil WC can be polygonal. That is, the shapes of each coil module 1001, 1003 and the shapes of the components of the working coil WC disposed in the coil modules 1001, 1003 can all be polygonal.

[0411] As an example, the components of the working coil WC can be configured such that their shape is rectangular. That is, the multiple working coils WC disposed in each coil module 1001, 1003 can be configured to be rectangular.

[0412] As another example, the working coil WC can also be hexagonal in shape. For example, the working coil WC can be formed into a hexagonal spiral shape. Therefore, in the coil module 1001a, multiple working coils can be arranged in a honeycomb shape. By providing multiple working coils WC, each working coil WC being formed into a hexagonal spiral shape or a honeycomb shape, the centers of all the working coils WC provided to the coil module 1001a can be kept at equal intervals. For example, all the working coils WC provided to the coil module 1001a can be arranged such that the distance from the center of another adjacent working coil WC is kept at a specified value.

[0413] The advantage of providing the working coil WC in this form is that by making the center distance between adjacent working coils WC the same, the structure of the coil assembly 1000 can be designed more easily, so that the working coil WC can perform the functions of detecting the presence of the object to be heated and heating the object to be heated.

[0414] As another example, the working coil can be circular or elliptical in shape. For instance, the working coil can be formed into a spiral shape similar to a circle or ellipse. Even in this case, the coil module can be configured such that the centers of all the working coils provided to the coil module can be kept equally spaced.

[0415] [Exemplary Implementation of Coil Pattern]

[0416] Figure 28 This is an enlarged view of a portion of the first coil layer group of the coil pattern of the working coil according to the first embodiment. Figure 29 This is an enlarged view of a portion of the second coil layer group of the coil pattern of the working coil according to the first embodiment. Figure 30 This is an enlarged view of a portion of the first coil layer group and the second coil layer group of the working coil according to the first embodiment. Figure 31 This is a cross-sectional view of the non-connected area of ​​the coil pattern of the working coil according to the first embodiment. Figure 32 This is a cross-sectional view of the AA1-AA2 portion of the connection area of ​​the coil pattern of the working coil according to the first embodiment. Figure 33 This is a cross-sectional view of the BB1-BB2 portion of the connection area of ​​the coil pattern of the working coil according to the first embodiment.

[0417] like Figures 28 to 30 As shown, the working coil according to the first embodiment may include multiple coil turns CT1, CT2. Although in Figures 28 to 30 Only two coil turns CT1 and CT2 included in the working coil are shown, but the number of coil turns included in the working coil can vary depending on the implementation.

[0418] Each of the coil turns CT1 and CT2 may include multiple coil strands. For example, the first coil turn CT1 may include multiple coil strands us1, us2, us3, us4, us5..., ls1, ls2, ls3, ls4... Similarly, the second coil turn CT2 may also include multiple coil strands.

[0419] Additionally, each coil turn CT1, CT2 may include multiple via patterns V1, V2, ... For example, the first coil turn CT1 may include multiple via patterns V1, V2, ... Similarly, the second coil turn CT2 may include multiple via patterns.

[0420] like Figures 31 to 33 As shown, the working coil according to the first embodiment may include a first coil layer group and a second coil layer group. The first coil layer group includes a plurality of first coil layers CL1-1, CL1-2, CL1-3, and CL1-4, and the second coil layer group includes a plurality of second coil layers CL2-1, CL2-2, CL2-3, and CL2-4.

[0421] Multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 can be configured according to a first pattern. Multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 can be stacked in the vertical direction.

[0422] Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be configured according to a second pattern different from the first pattern. Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be stacked vertically. Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be positioned below multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4.

[0423] Each coil layer may include multiple coil strands. For example, each of the first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and the second coil layers CL2-1, CL2-2, CL2-3, CL2-4 may include multiple coil strands us1, us2, us3, us4, us5..., ls1, ls2, ls3, ls4...

[0424] Although Figures 31 to 33 Only a cross-sectional view of the first coil turn CT1 is shown, but the second coil turn CT2 may also have the same structure and pattern as the first coil turn CT1.

[0425] Figures 31 to 33 An embodiment is shown in which the working coil includes four first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and four second coil layers CL2-1, CL2-2, CL2-3, CL2-4. However, the number of coil layers included in the working coil may vary depending on the embodiment.

[0426] Referring back to the accompanying drawings, the working coil according to the first embodiment may include non-connection regions 3001a, 3001b and connection region 3002.

[0427] Non-connected regions 3001a and 3001b and connected region 3002 can be set alternately. For example, although not shown in the figure, another connected region can be set at one end of non-connected region 3001a, and yet another connected region can be set at one end of non-connected region 3001b.

[0428] Reference Figures 28 to 31 In the non-connection regions 3001a and 3001b, each coil strand included in the plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in the plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 may not be electrically connected to each other.

[0429] In one embodiment, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be disposed in different traces in non-connection regions 3001a, 3001b.

[0430] For example, such as Figure 31 As shown, coil strands us1, us2, us3, and us4 included in multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 can be respectively arranged in the first trace TR1, the third trace TR3, the fifth trace TR5, and the seventh trace TR7. Furthermore, each of the coil strands 1s1, 1s2, and 1s3 included in multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be arranged in the second trace TR2, the fourth trace TR4, and the sixth trace TR6.

[0431] According to this configuration, since the distance between the coil strands included in the multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and the coil strands included in the multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 is increased, the proximity effect between the coil strands included in the multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and the coil strands included in the multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be reduced. Therefore, since the current distribution and magnetic flux density distribution of the working coil become more uniform, the power loss generated during the driving process of household appliances can be reduced, and the power efficiency can be improved. In addition, the phenomenon that the temperature of certain areas of the working coil becomes excessively high compared to other areas during the driving process of household appliances can be mitigated.

[0432] like Figure 30As shown, in the non-connection regions 3001a and 3001b, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be arranged to be parallel to each other.

[0433] like Figure 30 As shown, in the connection region 3002, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be configured to cross each other.

[0434] In connection region 3002, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be electrically connected to each other. In one embodiment, connection region 3002 may include vias VT1 and VT2, which electrically connect at least one coil strand included in the plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 to at least one coil strand included in the plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4.

[0435] For example, refer to Figures 28 to 30 , Figure 32 and Figure 33 The connection area 3002 may include vias VT1 and VT2 (e.g., through holes), vias VT1 and VT2 are electrically connected to via patterns V1 and V2, via patterns V1 and V2 are electrically connected to at least one coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, and CL1-4, and via patterns V1 and V2 are electrically connected to at least one coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, and CL2-4.

[0436] According to this structure, each coil strand included in the multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in the multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be electrically connected in the connection region 3002 while crossing each other. Therefore, the entire coil pattern included in the working coil can have a twisted structure similar to a Ritz coil. Thus, the skin effect and / or proximity effect between each coil strand included in the multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in the multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be reduced. Therefore, since the current distribution and magnetic flux density distribution of the working coil become more uniform, power losses generated during the driving process of household appliances can be reduced, and power efficiency can be improved. Additionally, the phenomenon that the temperature of certain areas of the working coil becomes excessively higher than other areas during the driving process of household appliances can be mitigated.

[0437] like Figure 30 As shown, the connection area 3002 may include two or more via patterns V1, V2. Therefore, the connection area 3002 may include two or more vias VT1, VT2.

[0438] In one embodiment, each via pattern may be positioned on a straight line intersecting with coil strands included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 or a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 at a predetermined angle. For example, in Figure 30 In the first coil turn CT1, the first via pattern V1 and the second via pattern V2 are arranged on a straight line that intersects the coil strands arranged in the non-connection regions 3001a and 3001b at a predetermined angle.

[0439] In one implementation, each via pattern included in each coil turn can be arranged on the same straight line. For example, in Figure 30 In the first coil turn CT1, the first via pattern V1 and the first via pattern in the second coil turn CT2 are arranged on the same straight line AA1-AA2. Similarly, the second via pattern V2 in the first coil turn CT1 and the second via pattern in the second coil turn CT2 are arranged on the same straight line BB1-BB2.

[0440] In one implementation, each via pattern included in each coil turn can be positioned at the same location as the via pattern included in another coil turn. For example, in Figure 30In the first coil turn CT1, the first via pattern V1 and the first via pattern in the second coil turn CT2 are located at the same position. Similarly, the second via pattern V2 in the first coil turn CT1 and the second via pattern in the second coil turn CT2 are located at the same position.

[0441] Figure 34 This is an enlarged view of a portion of the first coil layer group of the coil pattern of the working coil according to the second embodiment. Figure 35 This is an enlarged view of a portion of the second coil layer group of the coil pattern of the working coil according to the second embodiment. Figure 36 This is an enlarged view of a portion of the first and second coil layer groups of the working coil according to the second embodiment. Figure 37 This is a cross-sectional view of the non-connected area of ​​the coil pattern of the working coil according to the second embodiment. Figure 38 This is a cross-sectional view of the AA1-AA2 portion of the connection area of ​​the coil pattern of the working coil according to the second embodiment. Figure 39 This is a cross-sectional view of the BB1-BB2 portion of the connection area of ​​the coil pattern of the working coil according to the second embodiment.

[0442] like Figures 34 to 36 As shown, the working coil according to the second embodiment may include multiple coil turns CT1, CT2, CT3, and CT4. Although in Figures 34 to 36 Only four coil turns CT1, CT2, CT3, and CT4 included in the working coil are shown, but the number of coil turns included in the working coil can vary depending on the implementation.

[0443] Each of coil turns CT1, CT2, CT3, and CT4 may include multiple coil strands. For example, the first coil turn CT1 may include multiple coil strands us1, us2, us3, us4, us5..., ls1, ls2, ls3, ls4... Similarly, the second coil turn CT2, the third coil turn CT3, and the fourth coil turn CT4 may also include multiple coil strands.

[0444] Furthermore, each of the coil turns CT1, CT2, CT3, and CT4 may include multiple via patterns V1, V2, ... For example, the first coil turn CT1 may include multiple via patterns V1, V2, ..., and the second coil turn CT2 may include multiple via patterns V3, V4, ... Similarly, the third coil turn CT3 and the fourth coil turn CT4 may include multiple via patterns.

[0445] like Figures 37 to 39As shown, the working coil according to the second embodiment may include a first coil layer group and a second coil layer group. The first coil layer group includes a plurality of first coil layers CL1-1, CL1-2, CL1-3, and CL1-4, and the second coil layer group includes a plurality of second coil layers CL2-1, CL2-2, CL2-3, and CL2-4.

[0446] Multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 can be configured according to a first pattern. Multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 can be stacked in the vertical direction.

[0447] Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be configured according to a second pattern different from the first pattern. Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be stacked vertically. Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be positioned below multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4.

[0448] Each coil layer may include multiple coil strands. For example, each of the first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and the second coil layers CL2-1, CL2-2, CL2-3, CL2-4 may include multiple coil strands us1, us2, us3, us4, us5..., ls1, ls2, ls3, ls4...

[0449] Although Figures 37 to 39 Only the cross-sectional view of the first coil turn CT1 and the second coil turn CT2 is shown, but the third coil turn CT3 and the fourth coil turn CT4 may also have the same structure and pattern as the first coil turn CT1 and the second coil turn CT2.

[0450] Figures 37 to 39 An embodiment is shown in which the working coil includes four first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and four second coil layers CL2-1, CL2-2, CL2-3, CL2-4. However, the number of coil layers included in the working coil can vary depending on the embodiment.

[0451] Referring back to the accompanying drawings, the working coil according to the second embodiment may include non-connection regions 3003a, 3003b and connection region 3004.

[0452] Non-connected regions 3003a and 3003b and connected region 3004 can be set alternately. For example, although not shown in the figure, another connected region can be set at one end of non-connected region 3003a, and yet another connected region can be set at one end of non-connected region 3003b.

[0453] Reference Figures 34 to 37 In the non-connection regions 3003a and 3003b, each coil strand included in the plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in the plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 may not be electrically connected to each other.

[0454] In one embodiment, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 may be arranged in the same traces of each other in the non-connection regions 3003a, 3003b.

[0455] For example, such as Figure 37 As shown, the coil strands us1, us2, us3, and us4 of the multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 included in the first coil turn CT1 can be respectively arranged in the first trace TR1, the third trace TR3, the fifth trace TR5, and the seventh trace TR7. Similarly, the coil strands 1s1, 1s2, 1s3, and 1s4 of the multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 included in the first coil turn CT1 can also be respectively arranged in the first trace TR1, the third trace TR3, the fifth trace TR5, and the seventh trace TR7.

[0456] like Figure 36 As shown, in the non-connection regions 3003a and 3003b, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be arranged to be parallel to each other.

[0457] like Figure 36 As shown, in the connection region 3004, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be configured to cross each other.

[0458] In connection region 3004, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be electrically connected to each other. In one embodiment, connection region 3004 may include vias VT1, VT2, VT3, VT4, which electrically connect at least one coil strand included in the plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 to at least one coil strand included in the plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4.

[0459] For example, refer to Figures 34 to 36 , Figure 38 and Figure 39 The connection area 3004 may include vias VT1, VT2, VT3, VT4 (e.g., through holes), which will be electrically connected to via patterns V1, V2, V3, V4 included on at least one coil strand of a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and electrically connected to via patterns V1, V2, V3, V4 included on at least one coil strand of a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4.

[0460] According to this structure, each coil strand included in the multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in the multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be electrically connected in the connection region 3004 while crossing each other. Therefore, the entire coil pattern included in the working coil can have a twisted structure similar to a Ritz coil. Thus, the skin effect and / or proximity effect between each coil strand included in the multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in the multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be reduced. Therefore, since the current distribution and magnetic flux density distribution of the working coil become more uniform, power losses generated during the driving process of household appliances can be reduced, and power efficiency can be improved. Additionally, the phenomenon that the temperature of certain areas of the working coil becomes excessively higher than other areas during the driving process of household appliances can be mitigated.

[0461] like Figure 36 As shown, the connection area 3004 may include two or more via patterns V1, V2, V3, V4. Therefore, the connection area 3004 may include two or more vias VT1, VT2, VT3, VT4.

[0462] In one embodiment, each via pattern may be arranged on a straight line orthogonal to the coil strands included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 or a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4. For example, in Figure 36 In the first coil turn CT1, the first via pattern V1 and the second via pattern V2 are disposed on a straight line AA1-AA2 orthogonal to the coil strands disposed in the non-connection regions 3003a and 3003b. Similarly, the third via pattern V3 and the fourth via pattern V4 in the second coil turn CT2 are disposed on a straight line BB1-BB2 orthogonal to the coil strands disposed in the non-connection regions 3003a and 3003b.

[0463] In one implementation, each via pattern included in each coil turn can be arranged on the same straight line. For example, in Figure 36 In the first coil turn CT1, the first via pattern V1 and the second via pattern V2 are arranged on the same straight line AA1-AA2. Similarly, the third via pattern V3 and the fourth via pattern V4 in the second coil turn CT2 are arranged on the same straight line BB1-BB2.

[0464] In one implementation, each via pattern included in the nth coil turn can be positioned at the same location as the via pattern included in the (n+2)th coil turn (where n is a positive integer). For example, in Figure 30 In the first coil turn CT1, the first via pattern V1 and the second via pattern V2 are located at the same positions as the first via pattern and the second via pattern included in the third coil turn CT3. Similarly, the third via pattern V3 and the fourth via pattern V4 included in the second coil turn CT2 are located at the same positions as the third via pattern and the fourth via pattern included in the fourth coil turn CT4.

[0465] Figure 40 This is an enlarged view of a portion of the first coil layer group of the coil pattern of the working coil according to the third embodiment. Figure 41 This is an enlarged view of a portion of the second coil layer group of the coil pattern of the working coil according to the third embodiment. Figure 42 This is an enlarged view of a portion of the third coil layer group of the coil pattern of the working coil according to the third embodiment. Figure 43 This is an enlarged view of a portion of the first coil layer group, the second coil layer group, and the third coil layer group of the working coil according to the third embodiment. Figure 44 This is a cross-sectional view of the non-connected area of ​​the coil pattern of the working coil according to the third embodiment. Figure 45This is a cross-sectional view of the AA1-AA2 portion of the connection area of ​​the coil pattern of the working coil according to the third embodiment. Figure 46 This is a cross-sectional view of the BB1-BB2 portion of the connection area of ​​the coil pattern of the working coil according to the third embodiment.

[0466] like Figures 40 to 43 As shown, the working coil according to the third embodiment may include multiple coil turns CT1, CT2, CT3, and CT4. Although in Figures 40 to 43 Only four coil turns CT1, CT2, CT3, and CT4 included in the working coil are shown, but the number of coil turns included in the working coil can vary depending on the implementation.

[0467] Each of coil turns CT1, CT2, CT3, and CT4 may include multiple coil strands. For example, the first coil turn CT1 may include multiple coil strands us1, us2, us3, us4, us5..., ls1, ls2, ls3, ls4... Similarly, the second coil turn CT2, the third coil turn CT3, and the fourth coil turn CT4 may also include multiple coil strands.

[0468] Furthermore, each of the coil turns CT1, CT2, CT3, and CT4 may include multiple via patterns V1, V2, ... For example, the first coil turn CT1 may include multiple via patterns V1, V2, ..., and the second coil turn CT2 may include multiple via patterns V3, V4, ... Similarly, the third coil turn CT3 and the fourth coil turn CT4 may include multiple via patterns.

[0469] like Figures 40 to 43 As shown, the working coil according to the third embodiment may include a first coil layer group, a second coil layer group and a third coil layer group. The first coil layer group includes a plurality of first coil layers CL1-1, CL1-2, CL1-3 and CL1-4. The second coil layer group includes a plurality of second coil layers CL2-1, CL2-2, CL2-3 and CL2-4. The third coil layer group includes a plurality of third coil layers CL3-1, CL3-2, CL3-3 and CL3-4.

[0470] Multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 can be configured according to a first pattern. Multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 can be stacked in the vertical direction.

[0471] Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be configured according to a second pattern different from the first pattern. Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be stacked vertically. Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be positioned below multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4.

[0472] Multiple third coil layers CL3-1, CL3-2, CL3-3, and CL3-4 can be configured according to a third pattern different from the first and second patterns. Multiple third coil layers CL3-1, CL3-2, CL3-3, and CL3-4 can be stacked vertically. Multiple third coil layers CL3-1, CL3-2, CL3-3, and CL3-4 can be positioned below multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4.

[0473] Each coil layer may include multiple coil strands. For example, each of the first coil layers CL1-1, CL1-2, CL1-3, CL1-4, the second coil layers CL2-1, CL2-2, CL2-3, CL2-4, and the third coil layers CL3-1, CL3-2, CL3-3, CL3-4 may include multiple coil strands us1, us2, us3, us4, us5..., ls1, ls2, ls3, ls4..., ms1, ms2, ms3, ms4...

[0474] Although Figures 44 to 46 Only the cross-sectional view of the first coil turn CT1 and the second coil turn CT2 is shown, but the third coil turn CT3 and the fourth coil turn CT4 may also have the same structure and pattern as the first coil turn CT1 and the second coil turn CT2.

[0475] Figures 44 to 46 An embodiment is shown in which the working coil includes four first coil layers CL1-1, CL1-2, CL1-3, CL1-4, four second coil layers CL2-1, CL2-2, CL2-3, CL2-4, and four third coil layers CL3-1, CL3-2, CL3-3, CL3-4. However, the number of coil layers included in the working coil can vary depending on the embodiment.

[0476] Referring back to the accompanying drawings, the working coil according to the third embodiment may include non-connected regions 3005a, 3005b and connected regions 3006a, 3006b.

[0477] Non-connected regions 3005a and 3005b and connected regions 3006a and 3006b can be set alternately. For example, although not shown in the figure, another connected region can be set at one end of non-connected region 3005a, and yet another connected region can be set at one end of non-connected region 3005b.

[0478] Reference Figures 40 to 44 In the non-connection regions 3005a and 3005b, each coil strand included in the plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4, each coil strand included in the plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4, and each coil strand included in the plurality of third coil layers CL3-1, CL3-2, CL3-3, CL3-4 may not be electrically connected to each other.

[0479] In one embodiment, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4, each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4, and each coil strand included in a plurality of third coil layers CL3-1, CL3-2, CL3-3, CL3-4 may be arranged in the same trace as each other in the non-connection regions 3005a, 3005b. However, in another embodiment, at least one of each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4, each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4, and each coil strand included in a plurality of third coil layers CL3-1, CL3-2, CL3-3, CL3-4 may be arranged in a different trace than the coil strand included in another coil layer.

[0480] like Figure 44 As shown, in the non-connection regions 3005a and 3005b, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4, each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4, and each coil strand included in a plurality of third coil layers CL3-1, CL3-2, CL3-3, CL3-4 can be arranged to be parallel to each other.

[0481] like Figure 43As shown, in the connection regions 3006a and 3006b, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4, each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4, and each coil strand included in a plurality of third coil layers CL3-1, CL3-2, CL3-3, CL3-4 can be configured to cross each other.

[0482] In connection regions 3006a and 3006b, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4, each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4, and each coil strand included in a plurality of third coil layers CL3-1, CL3-2, CL3-3, CL3-4 can be electrically connected to each other. In one embodiment, connection regions 3006a and 3006b may include vias VT1, VT2, VT3, and VT4, which electrically connect at least one coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, and CL1-4, at least one coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, and CL2-4, and at least one coil strand included in each of a plurality of third coil layers CL3-1, CL3-2, CL3-3, and CL3-4.

[0483] For example, see Figures 40 to 43 , Figure 45 and Figure 46 The connection areas 3006a and 3006b may include vias VT1, VT2, VT3, and VT4 (e.g., through holes), which are electrically connected to via patterns V1, V2, V3, and V4 included on at least one coil strand of a plurality of first coil layers CL1-1, CL1-2, CL1-3, and CL1-4, and electrically connected to via patterns V1, V2, V3, and V4 included on at least one coil strand of a plurality of second coil layers CL2-1, CL2-2, CL2-3, and CL2-4.

[0484] Connection regions 3006a and 3006b may include a first connection region 3006a and a second connection region 3006b. In the first connection region 3006a, a via can be formed in the nth coil turn. In the second connection region 3006b, a via can be formed on the (n+2)th coil turn (where n is a positive integer). For example, in the first connection region 3006a, vias VT1 and VT2 can be formed in the first and third coil turns, while in the second connection region 3006b, vias VT3 and VT4 can be formed in the second and fourth coil turns.

[0485] According to this structure, each coil strand in the plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4, each coil strand in the plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4, and each coil strand in the plurality of third coil layers CL3-1, CL3-2, CL3-3, CL3-4 can be electrically connected in connection regions 3006a, 3006b while crossing each other. Therefore, the entire coil pattern included in the working coil can have a twisted structure similar to that of a Ritz coil. Thus, the skin effect and / or proximity effect between each coil strand in the plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4, each coil strand in the plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4, and each coil strand in the plurality of third coil layers CL3-1, CL3-2, CL3-3, CL3-4, which can be electrically connected to each other, can be reduced. Therefore, because the current and magnetic flux density distributions in the working coil become more uniform, power losses during the operation of household appliances can be reduced, and power efficiency can be improved. Additionally, it can mitigate the phenomenon where certain areas of the working coil become excessively hotter than other areas during the operation of household appliances.

[0486] like Figure 43 As shown, connection areas 3006a and 3006b may include two or more via patterns V1, V2, V3, and V4. Therefore, connection areas 3006a and 3006b may include two or more vias VT1, VT2, VT3, and VT4.

[0487] In one embodiment, each via pattern may be arranged on a straight line orthogonal to the coil strands included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 or a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 or a plurality of third coil layers CL3-1, CL3-2, CL3-3, CL3-4. For example, in Figure 43In the first coil turn CT1, the first via pattern V1 and the second via pattern V2 are disposed on a straight line AA1-AA2 orthogonal to the coil strands disposed in the non-connection regions 3005a and 3005b. Similarly, the third via pattern V3 and the fourth via pattern V4 in the second coil turn CT2 are disposed on a straight line BB1-BB2 orthogonal to the coil strands disposed in the non-connection regions 3005a and 3005b.

[0488] In one implementation, each via pattern included in each coil turn can be arranged on the same straight line. For example, in Figure 43 In the first coil turn CT1, the first via pattern V1 and the second via pattern V2 are arranged on the same straight line AA1-AA2. Similarly, the third via pattern V3 and the fourth via pattern V4 in the second coil turn CT2 are arranged on the same straight line BB1-BB2.

[0489] In one implementation, each via pattern included in the nth coil turn can be positioned at the same location as the via pattern included in the (n+2)th coil turn (where n is a positive integer). For example, in Figure 43 In the first coil turn CT1, the first via pattern V1 and the second via pattern V2 are located at the same positions as the first via pattern and the second via pattern included in the third coil turn CT3. Similarly, the third via pattern V3 and the fourth via pattern V4 included in the second coil turn CT2 are located at the same positions as the third via pattern and the fourth via pattern included in the fourth coil turn CT4.

[0490] Figure 47 This is an enlarged view of a portion of the first coil layer group of the coil pattern of the working coil according to the fourth embodiment. Figure 48 This is an enlarged view of a portion of the second coil layer group of the coil pattern of the working coil according to the fourth embodiment. Figure 49 This is an enlarged view of a portion of the first and second coil layer groups of the working coil according to the fourth embodiment. Figure 50 This is a cross-sectional view of the non-connected area of ​​the coil pattern of the working coil according to the fourth embodiment. Figure 51 This is a cross-sectional view of the AA1-AA2 portion of the connection area of ​​the coil pattern of the working coil according to the fourth embodiment. Figure 52 This is a cross-sectional view of the BB1-BB2 portion of the connection area of ​​the coil pattern of the working coil according to the fourth embodiment.

[0491] like Figures 47 to 52 As shown, the working coil according to the fourth embodiment may include multiple coil turns CT1, CT2. Although in Figures 47 to 52Only two coil turns CT1 and CT2 included in the working coil are shown, but the number of coil turns included in the working coil can vary depending on the implementation.

[0492] Each of the coil turns CT1 and CT2 may include multiple coil strands. For example, the first coil turn CT1 may include multiple coil strands us1, us2, us3, us4, us5..., ls1, ls2, ls3, ls4... Similarly, the second coil turn CT2 may also include multiple coil strands.

[0493] Additionally, each coil turn CT1, CT2 may include multiple via patterns V1, V2, ... For example, the first coil turn CT1 may include multiple via patterns V1, V2, ... Similarly, the second coil turn CT2 may include multiple via patterns.

[0494] like Figures 50 to 52 As shown, the working coil according to the first embodiment may include a first coil layer group and a second coil layer group. The first coil layer group includes a plurality of first coil layers CL1-1, CL1-2, CL1-3, and CL1-4, and the second coil layer group includes a plurality of second coil layers CL2-1, CL2-2, CL2-3, and CL2-4.

[0495] Multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 can be configured according to a first pattern. Multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 can be stacked in the vertical direction.

[0496] Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be configured according to a second pattern different from the first pattern. Multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be stacked in the vertical direction.

[0497] In one embodiment, multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be arranged alternately. For example, as Figures 50 to 52 As shown, the second coil layer CL2-1 can be located below the first coil layer CL1-1, and the first coil layer CL1-2 can be located below the second coil layer CL2-1. Thus, multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be arranged alternately.

[0498] Although not shown, in another embodiment, the first coil layer CL1-2 may be disposed below the first coil layer CL1-1, and the second coil layer CL2-1 and the second coil layer CL2-2 may be disposed below the first coil layer CL1-2. Furthermore, the first coil layers CL1-3 and CL1-4 may be stacked below the second coil layer CL2-2.

[0499] At the same time, although not shown, it is included according to Figures 34 to 39 In the second embodiment shown, the first and second coil layers in the working coil can also be arranged alternately.

[0500] Additionally, although not shown, it is included according to Figures 40 to 46 In the third embodiment shown, at least two of the first, second, and third coil layers in the working coil can be arranged alternately with each other.

[0501] Each coil layer may include multiple coil strands. For example, each of the first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and the second coil layers CL2-1, CL2-2, CL2-3, CL2-4 may include multiple coil strands us1, us2, us3, us4, us5..., ls1, ls2, ls3, ls4...

[0502] Although Figures 50 to 52 Only a cross-sectional view of the first coil turn CT1 is shown, but the second coil turn CT2 may also have the same structure and pattern as the first coil turn CT1.

[0503] Figures 50 to 52 An embodiment is shown in which the working coil includes four first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and four second coil layers CL2-1, CL2-2, CL2-3, CL2-4. However, the number of coil layers included in the working coil can vary depending on the embodiment.

[0504] Referring back to the accompanying drawings, the working coil according to the fourth embodiment may include non-connection regions 3001a, 3001b and connection region 3002.

[0505] Non-connected regions 3001a and 3001b and connected region 3002 can be set alternately. For example, although not shown in the figure, another connected region can be set at one end of non-connected region 3001a, and yet another connected region can be set at one end of non-connected region 3001b.

[0506] Reference Figures 47 to 49In the non-connection regions 3001a and 3001b, each coil strand included in the plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in the plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 may not be electrically connected to each other.

[0507] In one embodiment, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be disposed in different traces in non-connection regions 3001a, 3001b.

[0508] For example, such as Figure 50 As shown, coil strands us1, us2, us3, and us4 included in multiple first coil layers CL1-1, CL1-2, CL1-3, and CL1-4 can be respectively arranged in the first trace TR1, the third trace TR3, the fifth trace TR5, and the seventh trace TR7. Furthermore, each of the coil strands 1s1, 1s2, and 1s3 included in multiple second coil layers CL2-1, CL2-2, CL2-3, and CL2-4 can be arranged in the second trace TR2, the fourth trace TR4, and the sixth trace TR6.

[0509] According to this structure, since the distance between the coil strands included in the multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and the coil strands included in the multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 is increased, the proximity effect between the coil strands included in the multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and the coil strands included in the multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be reduced. Therefore, since the current distribution and magnetic flux density distribution of the working coil become more uniform, the power loss generated during the driving process of household appliances can be reduced, and the power efficiency can be improved. In addition, the phenomenon that the temperature of certain areas of the working coil becomes excessively high compared to other areas during the driving process of household appliances can be mitigated.

[0510] Figures 47 to 52The coil layers of the working coil shown can be manufactured using a fine process. However, due to the nature of the fine process, there is a possibility that adjacent strands may unintentionally bond or break due to unknown reasons. However, as mentioned above, when the first and second coil layers are arranged alternately, and a structure in which the first and second coil layers are arranged in different traces is applied, it is advantageous to respond to situations where adjacent strands are bonded or broken during the manufacturing process of the coil layers as described above. In particular, even if strands in some areas of the working coil are broken, there are other paths through which current can flow in the same direction, and therefore, the reliability of the working coil and the household appliance can be improved.

[0511] like Figure 49 As shown, in the non-connection regions 3001a and 3001b, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be arranged to be parallel to each other.

[0512] like Figure 49 As shown, in the connection region 3002, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be configured to cross each other.

[0513] In connection region 3002, each coil strand included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be electrically connected to each other. In one embodiment, connection region 3002 may include vias VT1 and VT2, which electrically connect at least one coil strand included in the plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 to at least one coil strand included in the plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4.

[0514] For example, see Figures 47 to 49 , Figure 51 and Figure 52The connection area 3002 may include vias VT1, VT2 (e.g., through holes), which are electrically connected to via patterns V1, V2 on at least one of the coil strands in the plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4, and electrically connected to via patterns V1, V2 on at least one of the coil strands in the plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4.

[0515] According to this structure, each coil strand included in the multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in the multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be electrically connected in the connection region 3002 while crossing each other. Therefore, the entire coil pattern included in the working coil can have a twisted structure similar to a Ritz coil. Thus, the skin effect and / or proximity effect between each coil strand included in the multiple first coil layers CL1-1, CL1-2, CL1-3, CL1-4 and each coil strand included in the multiple second coil layers CL2-1, CL2-2, CL2-3, CL2-4 can be reduced. Therefore, since the current distribution and magnetic flux density distribution of the working coil become more uniform, power losses generated during the driving process of household appliances can be reduced, and power efficiency can be improved. Additionally, the phenomenon that the temperature of certain areas of the working coil becomes excessively higher than other areas during the driving process of household appliances can be mitigated.

[0516] like Figure 49 As shown, the connection area 3002 may include two or more via patterns V1, V2. Therefore, the connection area 3002 may include two or more vias VT1, VT2.

[0517] In one embodiment, each via pattern may be positioned on a straight line intersecting with coil strands included in a plurality of first coil layers CL1-1, CL1-2, CL1-3, CL1-4 or a plurality of second coil layers CL2-1, CL2-2, CL2-3, CL2-4 at a predetermined angle. For example, in Figure 49 In the first coil turn CT1, the first via pattern V1 and the second via pattern V2 are arranged on a straight line that intersects the coil strands arranged in the non-connection regions 3001a and 3001b at a predetermined angle.

[0518] In one implementation, each via pattern included in each coil turn can be arranged on the same straight line. For example, in Figure 49In the first coil turn CT1, the first via pattern V1 and the first via pattern in the second coil turn CT2 are arranged on the same straight line AA1-AA2. Similarly, the second via pattern V2 in the first coil turn CT1 and the second via pattern in the second coil turn CT2 are arranged on the same straight line BB1-BB2.

[0519] In one implementation, each via pattern included in each coil turn can be positioned at the same location as the via pattern included in another coil turn. For example, in Figure 30 In the first coil turn CT1, the first via pattern V1 and the first via pattern in the second coil turn CT2 are located at the same position. Similarly, the second via pattern V2 in the first coil turn CT1 and the second via pattern in the second coil turn CT2 are located at the same position.

[0520] Figure 53 This is a circuit diagram of a sensing circuit according to one embodiment. Figure 54 This is a diagram showing the waveform of the resonant signal output from the output node of the sensing circuit according to the embodiment. Figure 55 This is a diagram showing the waveform of the square wave output from the comparator of the sensing circuit according to the embodiment.

[0521] In one implementation, the controller 500 can use Figure 53 The sensing circuit shown is used for container detection.

[0522] Reference Figure 53 The sensing circuit according to the embodiment may include a sensing coil SC, a resonant capacitor Cr2 connected in parallel with the sensing coil SC, a switching element SWt connected with the sensing coil SC and the resonant capacitor Cr2, and a comparator 360 that compares the resonant signal output from the output node N with a predetermined reference signal and outputs a square wave.

[0523] When container detection begins, the controller 500 can turn on the switching element SWt within a predetermined charging time. This allows the first power supply voltage VR1 and the ground terminal to be electrically connected, thereby applying voltage to the sensing coil SC and the resonant capacitor Cr2.

[0524] When the predetermined charging time has elapsed, the controller 500 can disconnect the switching element SWt. This causes resonance to occur between the sensing coil SC and the resonant capacitor Cr2.

[0525] When resonance occurs between the sensing coil SC and the resonant capacitor Cr2, a resonant signal can be output through the output node N. Figure 54This is a diagram showing the waveform of the resonant signal output from the output node of the sensing circuit according to the embodiment.

[0526] In one embodiment, the sensing circuit may further include a DC blocking unit 350 for removing the DC component from the resonant signal output from output node N. In another embodiment, the DC blocking unit 350 may be omitted.

[0527] The resonant signal output from output node N can be input to comparator 360. Comparator 360 can output a square wave by comparing the resonant signal with a reference signal defined by the second power supply voltage VR2. Figure 55 This is a diagram showing the waveform of the square wave output from the comparator of the sensing circuit according to the embodiment.

[0528] More specifically, comparator 360 can compare the voltage amplitude of the reference signal generated by the second power supply voltage VR2 with the voltage amplitude of the resonant signal output from output node N, and can output a square wave based on the comparison result. For example, if the voltage amplitude of the resonant signal output from output node N is greater than or equal to the voltage amplitude of the reference signal, comparator 360 can output a signal with a first level (e.g., 5V) voltage amplitude, and if the voltage amplitude of the resonant signal is less than the voltage amplitude of the reference signal, comparator 360 can output a signal with a second level (e.g., 0V) voltage amplitude.

[0529] The controller 500 can count the number of waveforms in the square wave output from the comparator 360 and determine whether a container is present on top of the sensing coil SC based on the count of the number of waveforms in the square wave.

[0530] When a container is present on top of the sensing coil SC, the impedance of the sensing coil SC and the resonant capacitor Cr2 remains relatively high compared to when the container is not present. Therefore, the resonant signal can be attenuated and then dissipated over a relatively short time period. Conversely, when a container is not present on top of the sensing coil SC, the impedance of the sensing coil SC and the resonant capacitor Cr2 remains relatively low compared to when the container is present. Therefore, the resonant signal can be attenuated and then dissipated over a relatively long time period.

[0531] As a result, the number of waveforms in the square wave output by comparator 360 when there is no container on top of the sensing coil SC is greater than the number of waveforms in the square wave output by comparator 360 when there is a container on top of the sensing coil SC.

[0532] Therefore, if the count of waveforms in the square wave is less than or equal to a predetermined reference value, the controller 500 can determine that a container exists on top of the sensing coil SC. Conversely, if the count of waveforms in the square wave exceeds the predetermined reference value, the controller 500 can determine that a container does not exist on top of the sensing coil SC. The reference value can be set differently depending on the implementation.

[0533] In one implementation, the controller 500 can sequentially perform container detection on each sensing coil SC. Therefore, while performing container detection on one sensing coil SC, the remaining sensing coil SCs can be kept in a discharged state.

[0534] Although this specification has been described with reference to the accompanying drawings as examples, it is obvious that this specification is not limited to the embodiments and drawings disclosed herein, and various modifications can be made by those skilled in the art. Furthermore, even though the effects of the configuration according to this specification are not explicitly stated while describing the embodiments, it should be understood that the effects that can be predicted by this configuration are natural.

Claims

1. A working coil, the working coil comprising: A plurality of first coil layers, the plurality of first coil layers being arranged along a first pattern and stacked in the vertical direction; as well as Multiple second coil layers are arranged along a second pattern, stacked vertically, and disposed in layers different from the multiple first coil layers. The working coil includes a connected region and a non-connected region, and The connection area includes a via, which electrically connects at least one coil strand in the plurality of first coil layers to at least one coil strand in the plurality of second coil layers.

2. The working coil according to claim 1, wherein, Each coil strand in the plurality of first coil layers and each coil strand in the plurality of second coil layers are disposed in different traces in the non-connected region.

3. The working coil according to claim 1, wherein, Each coil strand included in the plurality of first coil layers and each coil strand included in the plurality of second coil layers are disposed in the same trace in the non-connected region.

4. The working coil according to claim 1, wherein, Each coil strand included in the plurality of first coil layers and each coil strand included in the plurality of second coil layers are parallel to each other in the non-connected region.

5. The working coil according to claim 1, wherein, Each coil strand included in the plurality of first coil layers and each coil strand included in the plurality of second coil layers cross each other in the connection region.

6. The working coil according to claim 1, wherein, The connection area includes two or more via patterns, and Each via pattern is arranged on a straight line orthogonal to the coil strands included in the plurality of first coil layers or the plurality of second coil layers.

7. The working coil according to claim 1, wherein, The connection area includes two or more via patterns, and Each via pattern is arranged on a straight line that intersects the coil strands included in the plurality of first coil layers or the plurality of second coil layers at a predetermined angle.

8. The working coil according to claim 1, wherein, The working coil includes multiple coil turns, and Each via pattern in each coil turn is arranged on the same straight line.

9. The working coil according to claim 1, wherein, The working coil includes multiple coil turns, and The via pattern included in each coil turn is set in the same position as the via pattern included in another coil turn.

10. The working coil according to claim 1, wherein, The working coil includes multiple coil turns. The via pattern included in the nth coil turn is arranged on the first straight line, and Each via pattern included in the (n+1)th coil turn is positioned on the second straight line. Where n is a positive integer.

11. The working coil according to claim 1, wherein, The connected area and the non-connected area are alternately arranged.

12. The working coil according to claim 1, wherein, The first coil layer and the second coil layer are arranged alternately in the vertical direction.

13. The working coil according to claim 1, wherein, The working coil is included in the household appliance and heats the object.

14. A working coil, the working coil comprising: A plurality of first coil layers, the plurality of first coil layers being arranged along a first pattern and stacked in the vertical direction; Multiple second coil layers are arranged along a second pattern, stacked vertically, and disposed in layers different from the multiple first coil layers; as well as Multiple third coil layers are arranged along a third pattern, stacked vertically, and disposed in layers different from the multiple first coil layers and the multiple second coil layers. The working coil includes a connected region and a non-connected region, and The connection area includes a via, which electrically connects at least one coil strand in the plurality of first coil layers, at least one coil strand in the plurality of second coil layers, and at least one coil strand in the plurality of third coil layers.

15. The working coil according to claim 14, wherein, Each coil strand in the plurality of first coil layers, each coil strand in the plurality of second coil layers, and each coil strand in the plurality of third coil layers are disposed in the same trace in the non-connected region.

16. The working coil according to claim 14, wherein, The connection region includes a first connection region and a second connection region. In the first connection region, the via is formed in the nth coil turn, and In the second connection region, the via is formed in the (n+1)th coil turn. Where n is a positive integer.

17. The working coil according to claim 16, wherein, At least one of the coil strands in each of the plurality of first coil layers and at least one of the coil strands in each of the plurality of second coil layers are electrically connected in the first connection region through the via.

18. The working coil according to claim 16, wherein, At least one of the coil strands in each of the plurality of second coil layers and at least one of the coil strands in each of the plurality of third coil layers are electrically connected in the second connection region through the via.

19. The working coil according to claim 14, wherein, Each coil strand in the plurality of first coil layers, each coil strand in the plurality of second coil layers, and each coil strand in the plurality of third coil layers intersect each other in the connection region.

20. The working coil according to claim 14, wherein, The connection area includes two or more via patterns, and Each via pattern is arranged on a straight line orthogonal to the coil strands included in the plurality of first coil layers, the plurality of second coil layers, or the plurality of third coil layers.

21. The working coil according to claim 14, wherein, The connection area includes two or more via patterns, and Each via pattern is arranged on a straight line at a predetermined angle that intersects with the coil strands included in the plurality of first coil layers, the plurality of second coil layers, or the plurality of third coil layers.

22. The working coil according to claim 14, wherein, The working coil includes multiple coil turns. The via pattern included in the nth coil turn is arranged on the first straight line, and Each via pattern included in the (n+1)th coil turn is positioned on the second straight line. Where n is a positive integer.

23. The working coil according to claim 14, wherein, The connected area and the non-connected area are alternately arranged.

24. The working coil according to claim 16, wherein, In the nth coil turn, the first connecting region and the non-connecting region are alternately arranged, and In the (n+1)th coil turn, the second connecting region and the non-connecting region are alternately arranged. Where n is a positive integer.

25. The working coil according to claim 14, wherein, At least two of the first coil layer, the second coil layer, and the third coil layer are arranged alternately in the vertical direction.

26. The working coil according to claim 14, wherein, The working coil is included in the household appliance and heats the object.

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