Electric cooker

Abstract

An electric hob in one embodiment may include: a cover plate having a top surface on which an object to be heated is disposed; a support member accommodated in the housing; a plurality of coil substrates disposed on top of the support and spaced apart from each other, and on which working coils are printed; a first insulator disposed between the support and the cover plate; and a second insulator disposed between the support and the cover plate and positioned at an upper side and / or a lower side of the first insulator.

Description

Technical Field

[0001] This disclosure relates to an electric stove, and more specifically, to an induction heating type electric stove. Background Technology

[0002] The content described in this section is only to provide background information about this disclosure and does not constitute prior art.

[0003] Various types of cooking appliances are used to heat food at home or in restaurants. These cooking appliances include gas stoves that use gas and electric stoves that use electricity.

[0004] Electric stoves are mainly divided into resistance heating type electric stoves and induction heating type electric stoves.

[0005] Resistance heating type electric stoves use a method of applying current to a metal resistance wire or a non-metallic heating element such as silicon carbide to generate heat and then radiating or conducting the generated heat to heat a target (e.g., a cooking container such as a pot or frying pan).

[0006] Induction heating type electric stoves use a method of generating a magnetic field around a coil by applying high-frequency power to the coil and using the eddy current generated by the generated magnetic field to heat a heating target made of metal parts.

[0007] In the basic heating principle of induction heating, when current is applied to the working coil, heat is generated while the target is being induced to heat, and the target is heated by the generated heat.

[0008] In general electric stoves, the area of ​​the coil to which electricity is applied is relatively large. Furthermore, the target to be heated should be placed where it overlaps with such a large coil area so that the target can be heated effectively.

[0009] Therefore, since the coils of the electric stove occupy a large area, each heating zone corresponding to each of the few coils with a large area is set in the top of the electric stove.

[0010] Because of the limited number of heating zones and the large size of each zone, the cover of an electric stove with a limited area has only a few heating zones. Furthermore, the large size of the heating zones means that even when multiple heating zones are arranged in the stove, the non-heating areas confined between them occupy a significant portion of the space.

[0011] Because of this structure, the space on the stovetop where the heating target can be placed is narrowed. Even when heating small objects, a larger heating area is used, thus increasing power consumption. This causes inconvenience for the user.

[0012] To compensate for this drawback, coils with small-area plate-like structures can be incorporated into the electric stove. When multiple coils, each with a small area, are placed in the stove, the space between the coils is reduced, and only the coil with the heating target is operated, thereby improving the space efficiency of the stove and reducing power consumption. Summary of the Invention

[0013] Technical Purpose

[0014] The purpose of this disclosure is to provide an electric stove having a structure for preventing heat transfer from the heating target to the internal components.

[0015] Furthermore, the purpose of this disclosure is to provide an electric stove having a thermistor for indirectly measuring the temperature of a heated target.

[0016] Furthermore, the purpose of this disclosure is to provide an electric stove with a structure in which a thermistor can more accurately measure the temperature of the heated target.

[0017] The purpose of this disclosure is not limited to the foregoing objectives, and other unmentioned objectives and advantages of this disclosure will be understood based on the following description, and embodiments based on this disclosure will be more clearly understood. Furthermore, it will be readily understood that the objectives and advantages of this disclosure can be achieved by the means described in the claims and combinations thereof.

[0018] Technical solution

[0019] One embodiment of the electric stove may include: a cover plate having an upper surface on which a heating target is placed; a support member housed in the housing; a plurality of coil substrates disposed on top of the support member and spaced apart from each other, wherein a working coil is printed on each of the plurality of coil substrates; a first thermal insulator disposed between the support member and the cover plate; and a second thermal insulator disposed between the support member and the cover plate, and disposed on at least one of the upper or lower surfaces of the first thermal insulator.

[0020] The first thermal insulator may include first thermal insulators arranged spaced apart from each other along the longitudinal direction of the electric stove, wherein each of the first thermal insulators may be a single body extending along the transverse direction of the electric stove, wherein the second thermal insulator may include second thermal insulators arranged spaced apart from each other along the longitudinal direction of the electric stove, wherein each of the second thermal insulators may be a single body extending along the transverse direction of the electric stove, wherein each of the first thermal insulators and the second thermal insulators may cover the entire array of the plurality of working coils arranged spaced apart from each other along the transverse direction of the electric stove.

[0021] The first thermal insulator and the second thermal insulator can be located between the cover plate and the coil substrate, thereby suppressing heat transfer from the heating target to the support.

[0022] The electric stove may also include a plurality of thermistors disposed on the upper surface of the working coil or on at least one of the coil boundary regions defined between adjacent working coils, wherein the plurality of thermistors are arranged to be spaced apart from each other.

[0023] The electric stove may also include a plurality of heating pads, which are respectively disposed at positions corresponding to the positions of the plurality of thermistors and are arranged to be spaced apart from each other, wherein at least some of the plurality of heating pads are arranged to contact the lower surface of the cover plate.

[0024] The heat pad can be made of a thermally conductive material.

[0025] The thermistors can be uniformly arranged across the entire coil substrate and are disposed on the upper surface of the coil substrate.

[0026] The heating pad can be arranged to contact or be very close to the heating pad so that the heating pad can measure the temperature of the heat transferred from the heating pad.

[0027] The first thermal insulator may include a first hole formed at a position corresponding to the position of the thermistor, wherein at least a portion of the thermistor is inserted into the first hole, and the second thermal insulator may include a second hole formed at a position corresponding to the position of each of the thermistor and the first hole, wherein at least a portion of the thermistor is inserted into the second hole.

[0028] The thermistor can be disposed on the coil boundary region defined between adjacent working coils of the plurality of working coils arranged to be spaced apart from each other in the lateral direction, wherein some of the first holes and some of the second holes can be formed at positions corresponding to the coil boundary region.

[0029] In the electric stove, while the first thermal insulator and the second thermal insulator prevent heat from being transferred from the heating target to the coil substrate, the thermistor connected to the coil substrate can be disposed in the first hole and the second hole, and can receive heat from the heating pad and accurately measure the temperature of the heating target.

[0030] Beneficial effects

[0031] In the electric stove according to this disclosure, the first thermal insulator and the second thermal insulator are disposed between the cover plate and the coil substrate to suppress heat transfer from the heating target to the support member, thereby suppressing overheating of the components connected to the support member and improving the operating performance of the electric stove.

[0032] Furthermore, the first and second thermal insulators suppress the melting of the solder used to connect the thermistor to the upper surface of the coil substrate, thereby suppressing damage to the thermistor and improving the durability of the electric stove.

[0033] Furthermore, in the electric stove according to this disclosure, the thermistor can be uniformly arranged across the entire coil substrate and disposed on the upper surface of the coil substrate. Due to this structure, the electric stove can use the thermistor to indirectly measure the temperature of the heating target across the entire coil substrate.

[0034] Furthermore, in the electric stove according to this disclosure, when the coil substrate, the first thermal insulator and the second thermal insulator have been assembled together, the thermistor connected to the upper surface of the coil substrate can be inserted into the first hole and the second hole formed in the first thermal insulator and the second thermal insulator, and can be arranged to contact or be very close to the thermal pad disposed thereon, even if it does not contact the thermal pad disposed thereon.

[0035] Because of this structure, while the first thermal insulator and the second thermal insulator prevent heat from being transferred from the heating target to the coil substrate, the thermistor connected to the coil substrate can be disposed in the first hole and the second hole, and can receive heat from the thermal pad and accurately measure the temperature of the heating target.

[0036] In addition to the effects described above, specific effects of this disclosure will also be described in conjunction with the description of the specific matters of implementing this disclosure. Attached Figure Description

[0037] Figure 1 This is a perspective view showing an electric stove according to an embodiment.

[0038] Figure 2 This is a front view showing an electric stove according to an embodiment.

[0039] Figure 3 This is an exploded perspective view of an electric stove according to an embodiment.

[0040] Figure 4a yes Figure 1 The plan view of the cover plate is omitted.

[0041] Figure 4b This is a plan view showing the coil substrate according to an embodiment.

[0042] Figure 4c It is shown Figure 4b A plan view of a portion of the sensing coil shown.

[0043] Figure 5 It is along Figure 4a Cross-sectional view in direction 5-5.

[0044] Figure 6 This is a bottom view showing an electric stove according to an embodiment.

[0045] Figure 7 From Figure 6 The diagram of the outer shell is omitted.

[0046] Figure 8 This is a perspective view showing the support member according to an embodiment.

[0047] Figure 9 This is a plan view showing the support member according to an embodiment.

[0048] Figure 10 It is along Figure 9 Cross-sectional view in direction 10-10.

[0049] Figure 11 It is along Figure 9 Cross-sectional view in direction 11-11.

[0050] Figure 12 This is an exploded perspective view showing the support components and the ferrite module.

[0051] Figure 13 This is a plan view showing the state of the ferrite module connected to the support.

[0052] Figure 14 It is shown in Figure 13 A plan view of the coil substrate connection state under the specified conditions.

[0053] Figure 15 This is a bottom view of the support component.

[0054] Figure 16 It is shown in Figure 15 The diagram shows the connection status of the indicator board under the specified conditions.

[0055] Figure 17 It is shown in Figure 16 The diagram shows the connection status of various components under the given conditions.

[0056] Figure 18 This is an exploded view showing some of the components that make up an electric stove.

[0057] Figure 19 This is a perspective view showing a second thermal insulator and a thermal pad according to an embodiment.

[0058] Figure 20a This is a plan view showing the coil substrate mounted on the support.

[0059] Figure 20b This is a diagram showing a support member according to another embodiment.

[0060] Figure 20c It is along Figure 20b The cross-sectional view taken in the direction 20c-20c.

[0061] Figure 20d This is a diagram showing a support member according to another embodiment.

[0062] Figure 20e This is a diagram showing a support member according to another embodiment.

[0063] Figure 20f It is along Figure 20e The cross-sectional view taken from the direction 20f-20f.

[0064] Figure 21 This is a plan view showing the second thermal insulator placed on top of the support.

[0065] Figure 22 This is a perspective view showing the coil substrate according to an embodiment.

[0066] Figure 23 yes Figure 22 Side view.

[0067] Figure 24 This is a perspective view showing a first thermal insulator according to an embodiment.

[0068] Figure 25 This is a three-dimensional view showing the entire first thermal insulator.

[0069] Figure 26 It is along Figure 21 The cross-sectional view of the electric stove observed in direction 26-26.

[0070] Figure 27 It is along Figure 21 The cross-sectional view of the electric stove observed in direction 27-27.

[0071] Figure 28 yes Figure 26 Enlarged views of parts 28(a) and 28(b) in the image.

[0072] Figure 29 yes Figure 28 A three-dimensional image.

[0073] Figure 30 This is an exploded view showing a temperature sensor as a temperature sensing device and a sensor holder supporting the temperature sensor according to another embodiment.

[0074] Figure 31 This is a cross-sectional view showing the temperature sensor installed on the electric stove.

[0075] Figure 32 It is a cross-sectional view showing the temperature sensor and sensor holder connected to each other. Detailed Implementation

[0076] The above-described objects, features, and advantages will be described in detail below 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 well-known technologies related to this disclosure will be omitted where it is determined that such detailed descriptions may unnecessarily obscure the essential points of this disclosure. Hereinafter, preferred embodiments according to this disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar components.

[0077] Although terms like "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. Therefore, unless explicitly stated otherwise, a first component can be a second component.

[0078] As used herein, unless otherwise stated, each component may be configured as one or more components.

[0079] As used herein, the singular form “a” and “one” are intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, the terms “comprising,” “including,” “containing,” and “having” as used herein should not be construed as necessarily including all the various components or steps described herein, but may be interpreted as excluding certain components or steps. It should also be understood that the terms “comprising,” “including,” “containing,” and “having” as used herein specify the presence of one component or step, but do not exclude the presence or addition of another component or step.

[0080] Unless otherwise specified, throughout this disclosure, “A and / or B” means A, B or A and B, and “C to D” means C (inclusive) to D (inclusive), unless otherwise specified.

[0081] Throughout this disclosure, "upward direction," "downward direction," or "vertical direction" refers to the upward, downward, or vertical direction in which the electric stove is installed for daily use. "Double lateral direction" or "lateral direction" refers to a direction orthogonal to the vertical direction. Both lateral directions or lateral directions can include both "left-right direction" and "front-back direction," and the left-right direction and the front-back direction are orthogonal to each other.

[0082] Figure 1 This is a perspective view showing an electric stove according to an embodiment. Figure 2 This is a front view showing an electric stove according to an embodiment. Figure 3 This is an exploded perspective view of an electric stove according to an embodiment.

[0083] The electric stove according to this embodiment can heat the target material using induction heating. In this regard, the target material can be, for example, tableware made of a metal material such as stainless steel or iron.

[0084] In the induction heating method, high-frequency power is applied to the working coil 140a to generate a magnetic field around the working coil 140a, and the eddy current generated by the generated magnetic field is used to heat the heating target made of metal parts.

[0085] In other words, when the working coil 140a and the ferrite material are arranged adjacent to each other and high-frequency power is applied to the working coil 140a, the working coil 140a can generate a magnetic field.

[0086] When a magnetic field is generated around the working coil 140a and the target to be heated is placed in the region of the generated magnetic field, eddy currents are induced in the target under the magnetic field, and Joule heating is generated by these eddy currents, thereby heating the target. The tableware that is the target to be heated is heated, so that the food contained in the target to be heated can be heated and cooked.

[0087] The electric stove according to the embodiment may include a housing 110, a cover plate 120, a support (upper support) 130, a coil substrate 140, and a ferrite module 150.

[0088] The housing 110 can be used to protect the components constituting the electric stove. For example, the housing 110 can be made of aluminum. However, embodiments of this disclosure are not limited thereto. In one example, the housing 110 can be heat-insulated to suppress the heat generated by the coil substrate 140 from escaping to the outside.

[0089] The outer casing 110 can house the components constituting the electric stove, and its upper part is open, and its open part can be closed with a cover plate 120. The outer casing 110 can be formed by processing a sheet material into a box shape.

[0090] The housing 110 may include a base plate 111 and side walls 112. The base plate 111 may define the bottom surface of the housing 110. The base plate 111 may support the internal components of the electric stove.

[0091] The side wall 112 can be bent from the base plate 111 to define a receiving space for the component. The side wall 112 can be bent upward from the edge of the base plate 111 to define the side surface of the stove.

[0092] Sidewalls 112 may be provided on each of the four sides of the base plate 111, which are generally formed as quadrilaterals. Sidewalls 112 can enhance the rigidity of the entire housing 110. That is, sidewalls 112 formed to bend from the base plate 111 can prevent the plate-shaped base plate 111 from bending or being damaged by the weight of the received components or external forces.

[0093] Furthermore, the cover plate 120 can be attached to the top of the side wall 112. In this way, the housing 110 and the cover plate 120 are connected to each other to enclose the internal space of the housing 110, and the internal space in which various components are arranged can be confined inside the housing 110.

[0094] The cover plate 120 can be attached to the upper end of the housing 110, and the heating target can be disposed on its upper surface. The cover plate 120 can close the open upper portion of the housing 110 to protect the components housed in the housing 110.

[0095] The heating target is placed on the upper surface of the cover plate 120, and the magnetic field generated by the coil substrate and the ferrite module 150 can pass through the cover plate 120 to reach the heating target. The cover plate 120 can be made of, for example, a material including ceramics. However, embodiments of this disclosure are not limited thereto.

[0096] The cover plate 120 can be made of, for example, glass material, and can be manufactured to be transparent or translucent, allowing light shining from the indicator plate 250 to pass through it.

[0097] An input interface 160 for receiving input from a user can be installed in the electric stove. The input interface 160 can be installed to overlap with a specific area of ​​the cover plate 120 and can display a specific image.

[0098] For example, the input interface 160 can be embedded in the cover plate 120 in a flat manner, or it can be mounted to contact the lower surface of the cover plate 120.

[0099] The input interface 160 can receive touch input from the user, and the electric stove can operate based on the received touch input.

[0100] For example, input interface 160 refers to a module for a user to input the heating intensity or heating time desired by the user, and can be implemented as a physical button or touch panel.

[0101] For example, the input interface 160 may be a thin-film transistor liquid crystal display (TFT LCD). However, embodiments of this disclosure are not limited thereto.

[0102] The cover plate 120 may be provided with a cover frame 121 for connecting the support member 130 and the cover plate 120 to each other. The cover frame 121 may be formed adjacent to the edge of the cover plate 120 and project downward from the cover plate 120 to face the side plate 136 of the support member 130.

[0103] When the cover plate 120 is attached to the support member 130, the cover frame 121 can be arranged to surround the outer surface of the side plate 136 of the support member 130. Holes can be formed in the cover frame 121, and protrusions can be formed on the support member 130 at positions corresponding to the locations of the holes.

[0104] Therefore, at the position where the side plates 136 of the cover frame 121 and the support member 130 overlap laterally, the protrusion of the support member 130 can be inserted into the hole of the cover frame 121, so that the cover plate 120 and the support member 130 can be connected to each other.

[0105] The support member 130 can be housed in the housing 110. The support member 130 can be housed in the housing 110, and various components for operating the electric stove can be connected thereto.

[0106] The coil substrate 140 and ferrite module 150 that generate the magnetic field can be disposed on the upper surface of the support member 130. In addition, various circuit boards used to operate the electric stove and cooling devices for cooling the circuit boards can be disposed below the support member 130.

[0107] To accommodate a large number of such components, the support member 130 can have a complex shape. Therefore, the support member 130 can be easily manufactured into complex shapes using injection molding, for example, with plastic materials. The detailed structure of the support member 130 will be described in detail below.

[0108] The coil substrate 140 can be disposed on the upper surface of the support 130, and can include a plurality of coil substrates spaced apart from each other in the lateral direction, and the working coil 140a can be printed thereon.

[0109] The general-purpose working coil 140a is manufactured by spirally winding the coil. Regarding the working coil 140a, the entire working coil 140a can be enlarged to accommodate larger coils. A large working coil 140a reduces the space efficiency of the heating area of ​​the electric stove and increases power consumption.

[0110] In one embodiment, a coil substrate 140 on which the working coil 140a is printed can be used. The coil substrate 140 can be configured such that the working coil 140a is printed on the coil substrate 140, rather than in a manner in which the working coil 140a is wound around the coil substrate 140.

[0111] When the working coil 140a is printed on the coil substrate 140, the working coil 140a can be densely printed in a small area, and the working coil 140a can be printed in the vertical direction of the coil substrate to form multiple layers.

[0112] For example, a multilayer structure can be formed by masking and printing the shape of the coil and the circuit pattern on a copper thin film, removing unnecessary parts to form the pattern by etching, and then coating the formed pattern with an insulating material to form the coil and circuit pattern that constitute the first layer.

[0113] Similarly, a copper thin film can be attached to an insulating material coating, and mask printing and etching processes can be performed on the copper thin film to form the coil and circuit pattern constituting the second layer. By repeating this process, a coil substrate 140 having multiple layers of working coils 140a can be manufactured.

[0114] Therefore, when the working coil 140a is printed on the coil substrate 140, the area of ​​the coil substrate 140 can be reduced compared to the method of winding the working coil 140a therein, and the working coil 140a can be sufficiently extended. Therefore, it is possible to manufacture a coil substrate 140 having a working coil 140a with a small area.

[0115] Furthermore, since the coil substrate 140 has a thin film shape, the coil substrate 140 in which the working coil 140a is provided can have a very thin shape compared to the method in which the working coil 140a is wound.

[0116] Therefore, in this embodiment, by using a coil substrate 140 on which the working coil 140a is printed, the volume occupied by the working coil 140a can be reduced, and the working coil 140a can be sufficiently extended. As a result, the entire electric stove can be manufactured to be thinner.

[0117] like Figure 3 As shown, compared to the method of winding the working coil 140a, in one embodiment, a large number of coil substrates 140, each with a small area, can be arranged in the electric stove. Therefore, multiple working coils 140a can be densely arranged in the electric stove.

[0118] Compared to the method of winding the working coil 140a, the coil substrates 140 can be arranged relative to each other without defining gaps between adjacent coil substrates 140. Due to this structure, multiple coil substrates 140 can be densely arranged in the electric stove without gaps.

[0119] Therefore, in the area where the coil substrate 140 is arranged, the gaps without working coils 140a can be minimized, allowing a large number of heating targets to be heated simultaneously, thereby improving the space efficiency of the electric stove.

[0120] Furthermore, the working coil 140a is printed on the coil substrate 140, so it is not necessary to form the working coil 140a in a circular shape. For example, the working coil 140a can be printed in a spiral manner or in a generally rectangular shape corresponding to the shape of the rectangular coil substrate 140.

[0121] Due to the above structure, a working coil 140a with a very large total length can be provided. Furthermore, the working coils 140a can be densely arranged on the coil substrate 140, and the working coils 140a are spaced apart from each other and operate independently of each other.

[0122] Therefore, only the working coil 140a in the region that at least partially overlaps with the heating target can operate to generate a magnetic field, while the remaining working coils 140a can remain inactive. Due to this structure, the user can freely place the heating target anywhere on the cover plate 120.

[0123] Therefore, it provides convenience for users. In addition, the working coil 140a, which does not overlap with the heating target, does not operate, thereby significantly reducing power consumption.

[0124] The ferrite module 150 can be disposed on the top of the support 130 or below the coil substrate 140, and can include multiple ferrite modules, which are respectively positioned at positions corresponding to multiple working coils 140a.

[0125] The working coil 140a is printed on the coil substrate 140. Therefore, when high-frequency power is applied to the working coil 140a, a magnetic field can be generated around the ferrite module 150 and the coil substrate 140, and the generated magnetic field can generate eddy currents in the heated target.

[0126] Ferrite modules 150 can be disposed below the coil substrate 140. The number of ferrite modules can correspond to the number of working coils 140a, and their positions can correspond to the positions of the working coils 140a. In this embodiment, the ferrite modules 150 can be arranged in a generally rectangular shape.

[0127] The ferrite module 150 can be formed by insert injection molding of ferrite material and plastic material. In this respect, multiple pieces of ferrite material can be arranged spaced apart from each other in a ferrite module 150. The ferrite module 150 will be described in detail below.

[0128] Boards containing various control devices and circuits for operating the electric stove can be installed in the electric stove. These boards may include a main board 170, an electromagnetic interference (EMI) filter 190, a switch-mode power supply (SMPS) board 180, an inverter board 210, a resonator substrate 220, and an indicator board 250.

[0129] The motherboard 170 may be equipped with a controller for controlling the electric stove. The motherboard 170 can receive power from an external power source and can be configured to communicate with external devices in a wired or wireless manner.

[0130] The EMI filter 190 can suppress electromagnetic interference generated by electricity. The EMI filter 190 can receive AC power from an external power source. In addition, the EMI filter 190 can reduce the noise of the received AC power (i.e., electromagnetic interference (EMI)) and can provide noise-reduced AC power to the SMPS board 180.

[0131] The SMPS board 180 can supply power to the electric stove. The SMPS board 180 can receive AC power with reduced noise from the EMI filter 190. In addition, the SMPS board 180 can rectify the received AC power into DC power and can supply the rectified DC power to the inverter board 210.

[0132] Inverter board 210 can apply a resonant current to operating coil 140a. Inverter board 210 may include an inverter that applies a resonant current to operating coil 140a via switching operation. Multiple inverters can be configured, and the switching operation of the inverters can be controlled by a controller disposed on main board 170.

[0133] In this respect, the inverter can receive DC power from the SMPS board 180 and perform switching operations based on the received DC power to apply a resonant current to the working coil 140a.

[0134] Furthermore, the inverter may include two switching elements, which can be alternately turned on and off based on a switching signal provided from the controller. Additionally, a high-frequency alternating current (i.e., resonant current) can be generated from the switching operation of the two switching elements, and the generated high-frequency alternating current can be applied to the operating coil 140a.

[0135] Reference Figure 3 and Figure 7 The inverter board 210 according to the embodiment may include a resonant capacitor. That is, Figure 3 The inverter board 210 shown has a structure in which the inverter and the resonant capacitor are integrated with each other.

[0136] Reference Figure 17 According to another embodiment, the inverter board 210 may include only the inverter and not the resonant capacitor. In this respect, a separate resonator board 220 including the resonant capacitor may be provided in the stove.

[0137] The resonator substrate 220 and the resonant capacitor will be described first below. The resonant capacitor is electrically connected to the inverter. Resonance of the resonant capacitor begins when a resonant current is applied to the operating coil 140a through the switching operation of the inverter.

[0138] Furthermore, when the resonant capacitor resonates, the current flowing through the working coil 140a connected to the resonant capacitor increases. In other words, through this process, eddy currents can be induced in the heating target arranged on top of the working coil 140a connected to the resonant capacitor.

[0139] Multiple resonant capacitors can be provided. In the case where both the inverter and the resonant capacitors are integrated in the inverter board 210, the resonant capacitors can be arranged to be separated from the inverter in the inverter board 210.

[0140] In another example, when the inverter board 210 and the resonator substrate 220 are spaced apart from each other and exist separately, the resonant capacitor can be disposed in the resonator substrate 220.

[0141] The indicator panel 250 may include a light source. The light source may be arranged, for example, in the form of multiple LEDs arranged in a row.

[0142] When the electric stove is operated, the indicator panel 250 can be opened to notify the user whether the heating unit is operating. In addition, the indicator panel 250 can change the lighting shape, color, etc. of multiple LEDs to inform the user of the operating status of the electric stove.

[0143] The electric stove may include a support plate (lower support) 260 disposed on the top of the base plate 111 of the housing 110. The support plate 260 may be disposed below the support member 130, housed in the housing 110, disposed below the plate connected to the lower surface of the support member 130, and may support the support member 130.

[0144] The support plate 260 can be formed as a plate, and the holes can be located in positions corresponding to the inlet hole 1112 and outlet hole 1113 formed in the base plate 111, which will be described later, so that air flows through the inlet hole 1112 and outlet hole 1113 formed in the base plate 111.

[0145] Multiple boards, a blower fan 230, a heat sink 240, a ferrite module 150, and a coil substrate 140 can be mounted on a support 130, which can support the load of these components. Because multiple components are connected to the support, the support 130 may deform and sag downwards due to the load of these components.

[0146] Therefore, the support plate 260 can be positioned below the support member 130 to support the support member 130 which is connected to multiple components, thereby preventing the support member 130 from sagging downwards.

[0147] In another embodiment, components such as multiple plates, a blower fan 230, a heat sink 240, etc., can be connected to a support plate (lower support) 260. In this structure, the load applied to the support 130 can be reduced, thereby suppressing the occurrence of downward deformation of the support 130 to a certain extent.

[0148] When the electric stove has been assembled, the support plate 260 can be positioned at a distance from the support plate 260 along the vertical direction, with the distance being sufficient to allow the support plate to support relatively large components set in various plates, as well as blower fan 230 and radiator 240, which have larger volumes than other components.

[0149] The protrusions supporting the support member 130 or components connected to the lower surface of the support member 130 may protrude upward from the upper surface of the support plate 260. In one example, the protrusions supporting the support plate 260 may protrude upward from the upper surface of the base plate 111 of the housing 110.

[0150] Various plates can be mounted on top of the support plate 260. Therefore, it is necessary to prevent leakage and short circuit by electrically insulating the plates that may come into contact with the support plate 260 from the base plate 111 of the housing 110 made of a material such as aluminum.

[0151] Therefore, the support plate 260 can be made of an electrically insulating material and can be disposed between the base plate 111 of the housing 110 and the plate to electrically insulate the plate from the base plate 111. The support plate 260 can be made of, for example, mica (which is an electrically insulating material) or plastic.

[0152] The electric stove may include a first thermal insulator 270 and a second thermal insulator 280. The first thermal insulator 270 may be disposed between the support member 130 and the cover plate 120 to suppress heat transfer from the heating target to the support member 130.

[0153] The heat generated by heating the target can pass through the cover plate 120 and be transferred to the support 130 and various components connected to it arranged inside the electric stove.

[0154] This heat transfer heats the interior of the stove, and in particular, when it is transferred to various plates, it can adversely affect the operation of the stove. Therefore, a first thermal insulator 270 is disposed between the cover plate 120 and the support member 130 to suppress heat transfer from the heating target to the stove, thereby preventing the internal components from heating up and improving the operating performance of the stove.

[0155] The first thermal insulator 270 can be made of, for example, a carbon material that has good thermal insulation properties even when manufactured to have a relatively small thickness. However, embodiments of this disclosure are not limited thereto.

[0156] The first thermal insulator 270 can be formed in the shape of a plate and includes multiple thermal insulators to respectively cover the coil substrate 140. As a whole, the first thermal insulators 270 can be spaced apart from each other in the longitudinal direction of the electric stove and can be integrally formed with each other in the transverse direction. That is, the longitudinal direction of a first thermal insulator 270 can be parallel to the transverse direction of the electric stove.

[0157] The second thermal insulator 280 may be disposed between the support member 130 and the cover plate 120, and may be disposed on at least one of the upper or lower surfaces of the first thermal insulator 270.

[0158] exist Figure 3In the embodiment shown, the second thermal insulator 280 is disposed on each of the upper and lower surfaces of the first thermal insulator 270. In another embodiment, the second thermal insulator 280 may be disposed on either the upper or lower surface of the first thermal insulator 270.

[0159] The second thermal insulator 280 can be configured to have a shape corresponding to that of the first thermal insulator 270. Therefore, as a whole, the second thermal insulators 280 can be spaced apart from each other in the longitudinal direction of the electric stove, and can be integrally formed with each other in the transverse direction. That is, the longitudinal direction of one second thermal insulator 280 can be parallel to the transverse direction of the electric stove.

[0160] The second thermal insulator 280 is made of mica material, and together with the first thermal insulator 270, the second thermal insulator 280 can suppress heat transfer from the heating target to the support member 130 inside the electric stove. Furthermore, the second thermal insulator 280 can be arranged to contact the first thermal insulator 270 to prevent damage to the first thermal insulator 270 due to impact.

[0161] In particular, since the first thermal insulator 270, made of carbon, is susceptible to impact and damage, the second thermal insulator 280 can support the first thermal insulator 270 to suppress damage to the first thermal insulator 270, thereby improving the durability of the first thermal insulator 270.

[0162] In one example, each of the first thermal insulator 270 and the second thermal insulator 280 in the region where the input interface 160 is arranged can be formed to have a shorter length than each of the first thermal insulator 270 or the second thermal insulator 280 in the region where the input interface 160 is not arranged, thereby not shielding the input interface 160 and thus not overlapping with the input interface 160. Hereinafter, unless otherwise stated, it will be described as follows: Figure 3 The implementation shown is as follows.

[0163] Figure 4a It is from Figure 1 The plan view of cover plate 120 is omitted. Figure 4a This is a plan view showing the coil substrate 140 according to an embodiment. Figure 4c It is shown Figure 4a A plan view of a portion of the sensing coil 2514 shown.

[0164] exist Figure 4aIn the diagram, for clarity, the working coil 140a and the sensing coil 2514 are shown in an overlapping manner. In the actual structure, the working coil 140a may be disposed below the sensing coil 2514, and the layers of the working coil 140a and the sensing coil 2514 may be arranged to be spaced apart from each other in the vertical direction of the stove and insulated from each other by insulating material.

[0165] The sensing coil 2514, which is used to sense the heating target and is placed on the upper surface of the cover plate 120, can be printed on the coil substrate 140. The sensing coil 2514 can be disposed, for example, on the uppermost layer of the coil substrate 140.

[0166] The sensing coil 2514 can be arranged to form multiple layers on the coil substrate 140. For example, the sensing coil 2514 can be disposed on the uppermost layer and the layer below it on the coil substrate 140, and the multilayer working coil 140a can be disposed below the layer of the sensing coil 2514.

[0167] The sensing coil 2514 can be manufactured by performing the mask printing and etching processes described above to form multiple layers on the working coil 140a.

[0168] The sensing coil 2514 can typically be circular and can be formed to have an area smaller than that of the working coil 140a. Multiple sensing coils 2514 can be disposed on the coil substrate 140, spaced apart from each other. The sensing coils 2514 can be disposed in the region where the working coil 140a is arranged, or they can be disposed in the coil boundary region 1412 between adjacent working coils 140a.

[0169] Multiple sensing coils 2514 are disposed on the coil substrate 140. Therefore, the position of the heating target can be accurately sensed by the sensing coils 2514 even when the heating target is placed at any position on the upper surface of the cover plate 120.

[0170] The screw hole H_sc can be formed to pass through the edge of the coil substrate 140. For example, a fastening device such as a bolt can pass through the screw hole H_sc and be connected to the support 130, so that the coil substrate 140 can be stably and securely connected to the support 130.

[0171] Reference Figure 4c The sensing coil 2514 can typically have a circular shape and can extend in a spiral shape. In this shape, a central region 2514c on which no coil is printed can be formed toward the interior of the sensing coil 2514.

[0172] A thermistor 320 for indirectly measuring the temperature of a heated target can be disposed in the central region 2514c. Furthermore, a sensor pad P_s for electrically connecting the two electrodes of the thermistor 320 can be disposed in the central region 2514c.

[0173] The sensor pad P_s can be printed on the upper surface of the coil substrate 140 and can be provided in the form of, for example, vias. The sensor pad P_s can be electrically connected to the controller, and the temperature information measured by the thermistor 320 can be transmitted to the controller.

[0174] The sensors P_s and the electrodes of the coil substrate 140 can be electrically connected to each other, for example, by soldering. The detailed structure of the thermistor 320 is described below with reference to the accompanying drawings.

[0175] For example, the sensor pad P_s and the thermistor 320 can be arranged to bypass the printed position of the coil of the working coil 140a. Therefore, the central region 2514c of the arrangement of the sensing coil 2514 in the region where the working coil 140a is placed can be arranged to bypass the region of the coil in which the wires used as the working coil 140a are printed.

[0176] In one example, the central region 2514c of the sensing coil 2514 can be positioned within the coil boundary region 1412 where the working coil 140a is not located. Therefore, the sensor pad P_s and the thermistor 320 can be arranged to bypass the working coil 140a.

[0177] Figure 5 It is along Figure 4a Cross-sectional view in direction 5-5. Figure 6 This is a bottom view showing an electric stove according to an embodiment.

[0178] The heat-generating components during the operation of the electric stove can be mounted on various panels.

[0179] For example, the switching elements responsible for the on / off control in an electric stove generate a lot of heat. Therefore, these elements should be forced to cool to prevent them from shutting down or malfunctioning due to overheating.

[0180] For this purpose, the electric stove may include a blower fan 230 and a radiator 240. The blower fan 230 and the radiator 240 can be used to cool various heating plates and other components.

[0181] The blower fan 230 can be attached to the lower surface of the support member 130 and can be positioned at a distance from the plate. The blower fan 230 can be configured to face the heatsink 240 and exhaust air to it. The blower fan 230 can be electrically connected to the motherboard 170, and its operation can be controlled by a controller located in the motherboard 170.

[0182] The heat sink 240 can be positioned below the support 130 and can be oriented parallel to the air discharge direction of the blower fan 230 along its longitudinal direction. The heat sink 240 can be attached to the lower surface of the inverter board 210.

[0183] In one embodiment, inverter board 210 includes a pair of inverter boards spaced apart from each other. Therefore, heat sink 240 may include a pair of heat sinks respectively connected to the pair of inverter boards 210. Corresponding to the pair of heat sinks 240, blower fan 230 may include a pair of blower fans respectively arranged at positions corresponding to the pair of heat sinks 240.

[0184] Multiple cooling fins can be formed in the radiator 240, and an airflow path for air to pass through can be formed therein and extend in a direction parallel to its longitudinal direction. Therefore, the air exhausted from the outlet of the blower fan 230 cools the radiator 240 while flowing along and over the outer surface of the radiator 240 and through the internal airflow path, thus the inverter board 210 can be effectively cooled.

[0185] Heat sink 240 can be connected to inverter board 210 to increase the heat dissipation area of ​​inverter board 210, so that inverter board 210 can be effectively cooled by the air flowing under the operation of blower fan 230.

[0186] Since the inverter, as a switching element, is located in the inverter board 210, it consumes a relatively large amount of power, which means that the inverter may be heated to a higher temperature than other components. Therefore, a heat sink 240 can be connected to the inverter board 210 to effectively cool the inverter.

[0187] The airflow under the operation of the blower fan 230 flows over the entire area below the support plate 260, so that other plates except the inverter plate 210 can also be cooled by the forced airflow, thereby completely cooling the interior of the electric stove.

[0188] like Figure 6 As shown, the base plate 111 of the housing 110 may include an inlet hole 1112 and an outlet hole 1113. The inlet hole 1112 may be formed at a position corresponding to the position of the blower fan 230, and air may be introduced into the inlet hole 1112 from the outside.

[0189] The outlet hole 1113 can be formed at a position corresponding to the air discharge area of ​​the radiator 240, and air can be discharged from the outlet hole 1113. The outlet hole 1113 can be formed at a position adjacent to the air outlet formed in the radiator 240 of the airflow path. Since the radiator 240 is configured as a pair of radiators and the blower 230 is configured as a pair of blowers, the inlet hole 1112 can be configured as a pair of inlet holes, and the outlet hole 1113 can be configured as a pair of outlet holes.

[0190] The working coil 140a can be formed in multiple layers on the coil substrate 140. For example, the multilayer coil can be printed on the coil substrate 140 such that the uppermost layer can consist of a sensing coil 2514 for sensing a heated target, while the remaining layers below it can consist of multiple working coils 140a.

[0191] exist Figure 4b In this configuration, the working coil 140a has a generally rectangular shape and is formed in a spiral shape. Due to this structure, the working coil 140a can be densely printed while having a shape corresponding to each of the rectangular mounting grooves 131 and ferrite modules 150, thereby increasing the overall length of the working coil 140a.

[0192] However, in another example, the working coil 140a can be formed as a polygon, a circle, or an ellipse.

[0193] As mentioned above, Figure 4a The working coil 140a shown can be a single layer, and multiple working coils 140a can be configured into multiple layers, which are spaced apart from each other in the vertical direction and disposed on the coil substrate 140. However, for clarity, in the following text, each of the multiple working coils 140a that overlap each other in the vertical direction and are configured into multiple layers can be referred to as an identical working coil 140a.

[0194] like Figure 4b As shown, multiple working coils 140a can be disposed on a coil substrate 140 and can be arranged along the transverse direction of the coil substrate 140.

[0195] exist Figure 4b For example, a coil substrate 140 is shown having two working coils 140a arranged along its transverse direction and four working coils 140a arranged along its longitudinal direction printed thereon. However, embodiments of the present disclosure are not limited thereto, and the size of the coil substrate 140 and the number of working coils 140a printed on a coil substrate 140 may vary, taking into account the shape or size of the entire electric stove and the ease of its assembly or disassembly.

[0196] In one example, a through-hole 1419 may be formed in a coil substrate 140 and between adjacent working coils 140a. A first piece 1321 of the support 130 may be fitted into the through-hole 1419. When the first piece 1321 is fitted into the through-hole 1419, the coil substrate 140 may be positioned as intended. The through-hole 1419 may have a shape corresponding to the shape of each of the first piece 1321 and the slit 1323 of the support 130.

[0197] Furthermore, due to this structure, the slit 1323 formed in the first piece 1321 is not blocked by the coil substrate 140, and the light irradiated from the indicator plate 250 can pass through the slit 1323 of the support member 130 and through the cover plate 120.

[0198] A working coil 140a can be disposed in a region corresponding to a ferrite module 150 and can overlap with it in the vertical direction. That is, a working coil 140a can be arranged to correspond to a ferrite module 150.

[0199] In this respect, the coil boundary region 1412 can be provided between adjacent working coils 140a. The longitudinal direction of the coil boundary region 1412 intersects the longitudinal direction of the through hole 1419. In this respect, the through hole 1419 is not formed in the coil boundary region 1412.

[0200] The lower surface of the coil substrate 140 is supported by the second piece 1322, and in this respect, the coil boundary region 1412 can be located at a position corresponding to the position of the second piece 1322 of the boundary rib 132.

[0201] exist Figure 5 In the diagram, the direction of airflow is indicated by arrows. When the blower fan 230 is operating, air can be drawn into the electric stove from the outside through the inlet hole 1112. A portion of the drawn air can pass through and along the outer surface of the radiator 240, and through the airflow path formed inside the radiator 240, while the remaining drawn air can be completely diffused into the interior of the electric stove's outer casing 110.

[0202] The forced airflow inside the housing 110 can be exhausted to the outside through the outlet hole 1113. In particular, the inverter board 210 connected to the heat sink 240 can be effectively cooled by the forced airflow. Therefore, the inverter, as a switching element heated to a high temperature, can be effectively cooled by the heat sink 240 and the air.

[0203] In one embodiment, the blower fan 230 is connected to the lower surface of the support member 130, the heat sink 240 is connected to the inverter board 210, and the inverter board 210 is connected to the lower surface of the support member 130. As a result, both the blower fan 230 and the heat sink 240, which are cooling devices, are connected to the support member 130, so that a separate structure for connecting the blower fan 230 and the heat sink 240 to each other can be omitted from the housing 110.

[0204] Therefore, the support structure of electric stoves is usually simplified, which simplifies the structure of the electric stove and reduces manufacturing costs.

[0205] Furthermore, the structure that contacts the blower fan 230 and the radiator 240 is omitted from the housing 110, which facilitates the assembly and disassembly of the housing 110 and the maintenance of the electric stove.

[0206] Figure 7 It is from Figure 6 The diagram of the outer casing 110 is omitted. Figure 8 This is a perspective view showing the support member 130 according to an embodiment. Figure 9 This is a plan view showing the support member 130 according to an embodiment.

[0207] Figure 10 It is along Figure 9 Cross-sectional view in direction 10-10. Figure 11 It is along Figure 9 Cross-sectional view in direction 11-11.

[0208] The support member 130 may include a flat plate 135 extending in a direction parallel to the lateral direction of the electric stove and a side plate 136 bending downward from the edge of the flat plate 135. The ferrite module 150 and the coil substrate 140 may be disposed on the flat plate 135, and the side plate 136 may support the flat plate 135 and be disposed below the edge of the flat plate 135.

[0209] The support member 130 may include a mounting groove 131 and a boundary rib 132.

[0210] The mounting recess 131 can be formed by recessing the plate 135. This mounting recess may include a plurality of mounting recesses arranged along the longitudinal and transverse directions of the support 130, such that each of the plurality of ferrite modules 150 is mounted in each of the plurality of mounting recesses. The mounting recess 131 is generally formed as a quadrilateral, so that each of the coil substrate 140 and the ferrite module 150 having a quadrilateral shape can be fitted into the mounting recess 131.

[0211] Boundary ribs 132 may define the boundary of each of the plurality of placement grooves 131, may be configured to project upward from the upper surface of the support 130, and may include a plurality of boundary ribs.

[0212] The boundary rib 132 may include a first piece 1321 and a second piece 1322. The first piece 1321 may extend in the lateral direction of the support 130. The second piece 1322 may extend in the longitudinal direction of the support 130 so as to intersect with the extension direction of the first piece 1321.

[0213] Reference Figure 4a The first piece 1321 can extend in the lateral direction of the support 130, and the second piece 1322 can extend in the longitudinal direction of the support 130. The first piece 1321 and the second piece 1322 can intersect each other, so that the upper surface of the support 130 can be completely formed into a grid shape.

[0214] A slit 1323 may be formed in the first member 1321. The slit 1323 may extend through the support member 130 in the vertical direction and may be formed as a narrow and elongated hole in the plan view. The indicator plate 250 may be disposed at a position corresponding to the position in the support member 130 where the slit 1323 is formed.

[0215] Therefore, the first piece 1321 and the slit 1323 extend in the lateral direction of the support 130, so that the length direction of the indicator plate 250 can also be parallel to the lateral direction of the support 130.

[0216] The light source of the indicator panel 250 emits light in an upward direction, and the irradiated light passes through the slit 1323 and through the cover plate 120 made of glass so that the user can see the irradiated light.

[0217] Both the slit 1323 and the indicator plate 250 extend in a direction parallel to the lateral direction of the support 130. The slits are spaced apart from each other, and the indicator plates 250 are also spaced apart from each other. Thus, the user can see light illuminating in a form where the light extends elongated in the lateral direction and the beams are spaced apart from each other in the longitudinal direction.

[0218] The first piece 1321 can be formed with a relatively large height, and the second piece 1322 can be formed with a height smaller than that of the first piece 1321. A slit 1323 is formed in the first piece 1321, and light passing through the slit 1323 needs to be clearly visible to the user without being diffused. Therefore, the first piece 1321 can be formed with a relatively large vertical length so that light does not propagate before it passes through the upper surface of the cover plate 120.

[0219] The first thermal insulator 270 and the second thermal insulator 280, which are disposed on the top of the first piece 1321, are spaced apart from each other via the slit 1323. Therefore, the first thermal insulator 270 and the second thermal insulator 280 do not block the slit 1323, so light passing through the slit 1323 can directly reach the cover plate 120.

[0220] The second piece 1322 can be formed to have a relatively small vertical length, and the first thermal insulator 270 and the second thermal insulator 280 can be disposed on the top of the second piece 1322. The first thermal insulator 270 or the second thermal insulator 280 can have a length direction parallel to the lateral direction of the support member 130.

[0221] Therefore, each of the first thermal insulator 270 and the second thermal insulator 280 can be integrally formed as a single body extending in the lateral direction of the support 130. The first thermal insulator 270 can be arranged to be spaced apart from each other in the longitudinal direction, and the second thermal insulator 280 can be arranged to be spaced apart from each other in the longitudinal direction. The first thermal insulator 270 can be spaced apart from each other via a first piece 1321 serving as a boundary between them. The second thermal insulator 280 can be spaced apart from each other via a first piece 1321 serving as a boundary between them.

[0222] That is, a plurality of first thermal insulators 270 may be spaced apart from each other via a first piece 1321, and second thermal insulators 280 may be spaced apart from each other via a first piece 1321. Each of the first thermal insulators 270 and the second thermal insulators 280 may be disposed on top of the second piece 1322. Therefore, the second piece 1322 may be formed to have a relatively small vertical length to define a space in which the first thermal insulators 270, the second thermal insulators 280 and the coil substrate 140 are arranged.

[0223] The ferrite module 150 may include a ferrite core 151 and a core fixing portion 152. When high-frequency power is applied to a working coil 140a printed on a coil substrate 140, a magnetic field can be generated around the working coil 140a, and the generated magnetic field can generate eddy currents in the heated target. The ferrite core 151 allows the generated magnetic field to move in an upward direction toward the heated target.

[0224] The ferrite core 151 can be installed in the core fixing portion 152, so that the ferrite core 151 can be fixed to the mounting groove 131. The core fixing portion 152 can be connected to the support member 130, and can be formed by insert injection molding like the ferrite core 151, and can fix the ferrite core 151.

[0225] The core fixing portion 152 can define the shape of the ferrite module 150 and can generally be formed in a quadrilateral shape. In one example, the ferrite core 151 can be formed in multiple parts and can be attached to the core fixing portion 152 via insert injection molding. Therefore, the ferrite module 150 can generally have a rectangular shape.

[0226] Figure 12 This is an exploded perspective view showing the support member 130 and the ferrite module 150. Figure 13 This is a plan view showing the state in which the ferrite module 150 is connected to the support member 130. Figure 14 It is shown that in Figure 13 A plan view of the coil substrate 140 in the connected state.

[0227] like Figure 12 to Figure 14 As shown, the ferrite module 150 can be mounted in the mounting groove 131 formed on the upper surface of the support 130. Next, after the ferrite module 150 is mounted in the mounting groove, the coil substrate 140 can be mounted on the support 130. Following this sequence, the mounting of the coil substrate 140 on the support 130 can be completed.

[0228] The coil substrate 140 and the ferrite module 150 can be configured to be supported by the boundary ribs 132 when placed in the mounting recess 131.

[0229] Each ferrite module 150 can be independently inserted into each mounting recess 131. When each of the ferrite modules 150 is inserted into the mounting recess 131, the side surface of the ferrite module 150 can be more stably supported by the first piece 1321 and the second piece 1322 of the boundary ribs 132.

[0230] When the coil substrate 140 is placed on the upper surface of the support 130, the lower surface of the coil substrate 140 can be supported by the second piece 1322 of the boundary rib 132. In this respect, the coil boundary region 1412 of the coil substrate 140 can be positioned on the upper surface of the second piece 1322.

[0231] The first piece 1321 of the boundary rib 132 can be fitted into the through hole 1419 of the coil substrate 140. Therefore, the coil substrate 140 can be placed in the designed position and can be supported by the first piece 1321 to suppress lateral movement of the support 130.

[0232] The substrate connection portion 141 can be configured to stably mount the coil substrate 140 to the support member 130. The substrate connection portion 141 can be connected to the coil substrate 140 and can connect the coil substrate 140 to the support member 130. The substrate connection portion 141 can be integrally formed with the coil substrate 140, or it can be manufactured separately and connected to the coil substrate 140.

[0233] The substrate connection portion 141 can be formed to protrude from a side end extending in the longitudinal direction of the coil substrate 140. The protruding substrate connection portion 141 can be connected to the support member 130 by a fastening device such as a bolt.

[0234] The connecting pin 1411 can be provided at the edge of the coil substrate 140. When the coil substrate 140 is connected to the support member 130 using the substrate connecting portion 141, the terminals formed on the support member 130 and the connecting pin 1411 can contact each other, so that the connecting pin 1411 and the terminals of the support member 130 can be electrically connected to each other.

[0235] The terminals of the support member 130 can be electrically connected to other electrical components via cables or the like.

[0236] In one embodiment, the ferrite module 150 can be easily and stably mounted on the support 130 by means of a mounting groove 131 formed in the upper surface of the support 130 and a boundary rib 132 formed to surround the mounting groove 131.

[0237] Furthermore, the first piece 1321 is assembled into the coil substrate 140 so that the coil substrate 140 can be positioned in the intended location when it is mounted on the support 130. This prevents the coil substrate from moving in the lateral direction of the support 130 (that is, in both the longitudinal and lateral directions of the support 130), allowing the coil substrate 140 to be easily assembled onto the support 130.

[0238] The electric stove may include an input interface 160 disposed on the upper surface of a support member 130. The input interface 160 may be coupled to the support member 130. For this purpose, the support member 130 may include a receiving groove 134 formed by recessing its upper surface downwards. The input interface 160 is inserted into the receiving groove 134.

[0239] The receiving recess 134 can be formed in a generally rectangular shape, corresponding to the shape of the input interface 160, which has a rectangular shape. Each of the receiving recess 134 and the input interface 160 can be located in the center of the front area of ​​the stove so that the user can easily operate the input interface from the user's perspective.

[0240] A hole for cables to pass through can be formed in the portion below the receiving recess 134. Cables can establish an electrical connection between the input interface 160 and other components.

[0241] Figure 15 This is a bottom view of support member 130. Figure 16 It is shown that the indicator panel 250 is in Figure 15 A diagram showing the connection state under the given conditions. Figure 17 This shows the various components in Figure 16 A diagram showing the connection state under the given conditions.

[0242] Various plates can be attached to the lower surface of the support 130. These plates can be attached to it by means of fastening devices such as bolts.

[0243] The motherboard 170 can be connected to the lower surface of the support 130 and can have a controller for controlling the electric stove.

[0244] The SMPS board 180 can be attached to the lower surface of the support 130 and can supply power to the electric stove. A pair of SMPS boards 180 can be configured to supply power to multiple working coils 140a.

[0245] The EMI filter 190 can be connected to the lower surface of the support 130 and can suppress electromagnetic interference generated by electricity. Since the EMI filter 190 is electrically connected to the SMPS board 180, the pair of SMPS filters can be arranged in a manner corresponding to the pair of PCBs 180 respectively.

[0246] Inverter board 210 can be attached to the lower surface of support 130 and can apply resonant current to operating coil 140a. A pair of inverter boards 210 can be configured to provide resonant current to multiple operating coils 140a.

[0247] In one example, such as Figure 17 As shown, an electric stove can be provided in which the inverter board 210 and the resonator substrate 220 are spaced apart from each other. The resonator substrate 220 can be connected to the lower surface of the support 130, can be arranged separately from the inverter board 210, and can include a resonant capacitor.

[0248] Therefore, various plates required for operating the electric stove can be arranged on the lower surface of the support member 130. In this respect, the plates can be arranged on the lower surface of the support member 130 at positions spaced apart from each other.

[0249] Each of the plates can be connected to the lower surface of the support 130 in an inverted manner. That is, among the components arranged on each plate, the components that occupy a relatively large volume can be placed on the lower surface of the plate.

[0250] Because of this structure, various plates can be easily connected to the lower surface of the support 130 without obstruction.

[0251] In one example, indicator plate 250 can be attached to the lower surface of support member 130, can be configured as multiple indicator plates spaced apart from each other, and can include a light source. Unlike other plates, indicator plate 250 can be positioned at an overlap with other plate portions.

[0252] The indicator plate 250 can be formed in the shape of a strip, and its longitudinal direction can be parallel to the transverse direction of the support member 130.

[0253] Reference Figure 15 and Figure 16 Each of the slits 1323 formed in the support member 130 can be configured such that its longitudinal direction is parallel to the transverse direction of the support member 130. The slits can be arranged in a straight line in the transverse direction of the support member. In addition, the slits 1323 can be arranged to be spaced apart from each other in the longitudinal direction of the support member 130.

[0254] The indicator plate 250 can be positioned at an overlap with the slit 1323 through which light passes. Therefore, the indicator plate 250 can be positioned on the lower surface of the support 130 and can cover the slit 1323.

[0255] Therefore, the indicator plate 250 can be arranged such that its longitudinal direction is parallel to the transverse direction of the support 130, and can be configured as a plurality of indicator plates spaced apart from each other in the longitudinal direction of the support 130.

[0256] In addition to the indicator plate 250, various plates for operating the aforementioned electric stove can be attached to the lower surface of the support and spaced apart from each other. These plates can be arranged to be spaced apart from each other.

[0257] Furthermore, the blower fan 230 constituting the cooling device can be disposed on the lower surface of the support member 130 and spaced apart from the plate. In one example, the heat sink 240 constituting the cooling device can be connected to the support member 130, thereby connecting to the lower surface of the inverter board 210.

[0258] In one embodiment, the ferrite module 150 and the coil substrate 140 can be attached to the upper surface of the support, and various plates for operating the electric stove and cooling device can be attached to the lower surface of the support.

[0259] As described above, most of the electrical components (e.g., the plate that operates when receiving power and participates in the operation of the electric stove, blower fan 230, etc.) can be connected to the support member 130. Due to this structure, the assembly and disassembly performance of the electric stove can be significantly improved.

[0260] In other words, when assembling the electric stove, the ferrite module 150, the coil substrate 140 and the input interface 160 can be assembled on the upper surface of the support 130 first, and various plates and cooling devices can be assembled on the lower surface of the support 130 at the same time.

[0261] Next, the first thermal insulator 270 and the second thermal insulator 280 are placed on top of the support member 130, the support plate 260 is placed below the support member 130, and then the cover plate 120 and the outer casing 110 are connected to each other to complete the assembly of the electric stove.

[0262] In this respect, since the housing 110 does not have a support structure for supporting the components connected to the support member 130, it is not necessary to align these components with the support structure, so the assembly of the housing 110 may be very easy.

[0263] Similarly, when the outer casing 110 and the cover plate 120 are disassembled from each other and the support plate 260 is removed from them for the maintenance of the electric stove, the maintenance personnel can immediately access the support 130 connected to various components and can easily replace faulty parts.

[0264] Furthermore, since the ferrite modules 150 are inserted separately into the mounting grooves 131 of the support 130, only the malfunctioning ferrite modules 150 need to be replaced, thus making it easy to repair the electric stove.

[0265] In one example, refer to Figure 15 to Figure 17 The various components can be assembled onto the lower surface of the support 130 in the following order. First, the indicator plate 250 can be attached to the lower surface of the support 130 at the location where the slit 1323 is formed, so as to cover the slit 1323.

[0266] Next, various boards and blower fans 230 can be placed at designed positions on the lower surface of the support 130 and secured to the support 130. In this regard, the heat sink 240 can be connected to the inverter board 210. Various boards other than the heat sink 240 and the indicator board 250 can be connected to the lower surface of the support 130 at positions spaced apart from each other.

[0267] Next, cable connection operations can be performed for electrical connections between various electrical components and for electrical connections between electrical components and external power sources.

[0268] In addition, the disassembly operation can be performed in the reverse order of the assembly operation described above.

[0269] Figure 18 This is an exploded view showing some of the components that make up an electric stove.

[0270] When the electric stove is working, the heating target placed on the upper surface of the cover plate 120 is heated, and heat can be transferred from the heating target to the electric stove. The heat from the heating target can pass through the cover plate 120 and can be transferred to the coil substrate 140 and various other plates below the cover plate 120.

[0271] This heat transfer can adversely affect the operation of the electric stove. For example, if excessive heat transfer occurs inside the stove, it may stop operating to protect its internal components. This could cause inconvenience to the user.

[0272] Furthermore, in order to indirectly measure the temperature of the heating target, the thermistor 320 can be connected to the upper surface of the coil substrate 140. The thermistor 320 can be integrally connected to the coil substrate 140. For example, the thermistor 320 can be connected to the upper surface of the coil substrate 140 by soldering.

[0273] The lead wire has a relatively low melting point. Therefore, when excessive heat is transferred from the heating target to the coil substrate 140, the lead wire may melt again. In this case, the welded connection between the thermistor 320 and the coil substrate 140 may be damaged, potentially causing the thermistor 320 to malfunction.

[0274] Therefore, in order to suppress the melting of the weld, it is necessary to prevent heat transfer from the heating target to the coil substrate 140.

[0275] In order to prevent heat transfer, in the electric stove of this embodiment, the first thermal insulator 270 and the second thermal insulator 280 can be disposed between the cover plate 120 and the coil substrate 140.

[0276] A first thermal insulator 270 may be disposed between the support member 130 and the cover plate 120 to suppress heat transfer from the heating target to the coil substrate 140 connected to the support member 130. The first thermal insulator 270 can suppress heat transfer from the heating target to the electric stove to prevent heating of internal components, thereby improving the operating performance of the electric stove.

[0277] The first thermal insulator 270 can be formed in a generally plate-like shape. The first thermal insulator 270 can be made of, for example, a carbon material that has good thermal insulation properties even when manufactured to have a relatively small thickness. However, embodiments of the present disclosure are not limited thereto.

[0278] The first thermal insulator 270 can be formed in the shape of a plate and can be configured as a plurality of first thermal insulators to cover the coil substrate 140. The first thermal insulators 270 can be spaced apart from each other in the longitudinal direction of the electric stove, and each of the first thermal insulators 270 extending in the transverse direction of the electric stove can be integrally formed. That is, the longitudinal direction of a first thermal insulator 270 can be parallel to the transverse direction of the electric stove.

[0279] The second thermal insulator 280 may be disposed between the support 130 and the cover plate 120, and may be disposed on at least one of the upper or lower surfaces of the first thermal insulator 270. The second thermal insulator 280 may be formed having a generally plate-like shape.

[0280] exist Figure 18 In one embodiment, the second thermal insulator 280 is disposed on top of the first thermal insulator 270. However, in another embodiment, the second thermal insulator 280 may be disposed below the first thermal insulator 270. Alternatively, the second thermal insulator 280 may be disposed on each of the upper and lower surfaces of the first thermal insulator 270. Such embodiments will be described in detail below.

[0281] The second thermal insulator 280 can be configured to have a shape corresponding to that of the first thermal insulator 270. Therefore, the second thermal insulators 280 can be spaced apart from each other in the longitudinal direction of the electric stove, and each of the second thermal insulators 280 extending in the transverse direction of the electric stove can be integrally formed. That is, the longitudinal direction of one of the first thermal insulators 270 can be parallel to the transverse direction of the electric stove.

[0282] The second thermal insulator 280 may be made of mica material, and together with the first thermal insulator 270, the second thermal insulator 280 can suppress heat transfer from the heating target to the support member 130 inside the electric stove. Furthermore, the second thermal insulator 280 may be arranged to contact the first thermal insulator 270 to prevent damage to the first thermal insulator 270 due to impact.

[0283] In particular, since the first thermal insulator 270, made of carbon, is susceptible to impact and damage, the second thermal insulator 280, made of solid mica material, can support the first thermal insulator 270 to suppress damage to the first thermal insulator 270, thereby improving the durability of the first thermal insulator 270.

[0284] In one example, each of the first thermal insulator 270 and the second thermal insulator 280 in the region where the input interface is arranged may be formed to have a shorter length than that of each of the first thermal insulator 270 and the second thermal insulator 280 in the region where the input interface is not arranged, so as not to cover the input interface and thus bypass the input interface.

[0285] In one embodiment, a first thermal insulator 270 and a second thermal insulator 280 are disposed between the cover plate 120 and the coil substrate 140 to suppress heat transfer from the heating target to the support member 130, thereby suppressing overheating of the components connected to the support member 130 and improving the operating performance of the electric stove.

[0286] Furthermore, the first thermal insulator 270 and the second thermal insulator 280 can suppress the melting of the solder used to connect the thermistor 320 to the upper surface of the coil substrate 140, thereby suppressing damage to the thermistor 320 and improving the durability of the electric stove.

[0287] In this respect, the thermistor 320 measures the temperature of the heat passing through the cover plate 120. The first and second thermal insulators do not inhibit heat transfer to the thermistor 320, but they can inhibit heat transfer from the heating target to the support 130 in areas other than where the thermistor 320 is arranged, thereby reducing the heat transferred to the weld and effectively inhibiting the melting of the weld.

[0288] The thermistor 320 can be disposed on and soldered to the upper surface of the coil substrate 140. The thermistor 320 can be arranged to protrude upward from the upper surface of the coil substrate 140.

[0289] The thermistor 320 can indirectly measure the temperature of the heated target. That is, the thermistor 320 does not need to be in direct contact with the heated target and can be arranged adjacent to the lower surface of the cover plate 120. Therefore, by measuring the temperature of the heat passing through the cover plate 120 through the thermistor 320, the temperature of the heated target can be indirectly determined.

[0290] The thermistor 320 can be arranged to contact or be very close to the heating pad 330, so that the temperature of the heat transferred from the heating target can be measured.

[0291] The controller can control the operation of the electric stove based on temperature information measured by the thermistor 320. For example, when the temperature measured by the thermistor 320 exceeds a set value, the current applied to the working coil can be reduced, or the operation of the working coil can be turned off to prevent overheating of various plates and other components inside the electric stove.

[0292] The thermistor 320 can be configured in various shapes. For example, in this embodiment, the thermistor 320 is typically configured in a rectangular shape. However, embodiments of this disclosure are not limited thereto, and the thermistor 320 can be formed in a circular, elliptical, or polygonal shape.

[0293] Thermistor 320 may be disposed on the upper surface of the working coil or on at least one of the coil boundary regions 1412 between adjacent working coils among a plurality of working coils, and may include a plurality of thermistors spaced apart from each other.

[0294] In order to accurately measure the temperature of the heat transferred to the entire coil substrate 140, multiple thermistors 320 need to be arranged uniformly and relatively densely on the entire coil substrate 140.

[0295] Therefore, in one embodiment, a plurality of thermistors 320 may be disposed on the area of ​​the coil substrate 140 in which the working coil is arranged, and a plurality of thermistors 320 may also be disposed on the coil boundary area 1412 in which no working coil is arranged.

[0296] In one embodiment, the thermistor 320 can be uniformly arranged on the entire upper surface of the coil substrate 140. Due to this structure, the electric stove can use the thermistor 320 to indirectly measure the temperature of the heating target of the entire coil substrate 140.

[0297] Because measured temperature information can be used to take measures to prevent the stove from overheating, the stove's operational performance can be improved.

[0298] In one embodiment, the thermistor 320 may be formed in a generally rectangular shape. Therefore, at the location where the working coil is arranged, the thermistor 320 may be oriented along a direction in which its longitudinal direction intersects with the longitudinal direction of the coil boundary region 1412.

[0299] Furthermore, in the coil boundary region 1412, which has a relatively narrow width, the thermistor 320 can be arranged such that its longitudinal direction is parallel to the longitudinal direction of the coil boundary region 1412.

[0300] Figure 19 This is a perspective view showing a second thermal insulator 280 and a heating pad 330 according to an embodiment. The electric stove may include the heating pad 330.

[0301] The thermal pad 330 may be positioned at a location corresponding to the position of the thermistor 320, and may include a plurality of thermal pads spaced apart from each other, with at least some of the thermal pads arranged to contact the lower surface of the cover plate 120.

[0302] The heating pad 330 can be made of a thermally conductive material and can be made of a material that has adhesive properties and is deformable under external force. That is, the heating pad 330 can be configured as a fluid gel form so that it is deformable under external force.

[0303] Therefore, even when the heating pad 330 and the thermistor 320 collide with each other, the heating pad 330 is deformable, thus mitigating the impact applied to the thermistor 320 and protecting it. Furthermore, since the heating pad 330 is made of a thermally conductive material, the heat from the cover plate 120 can be smoothly transferred to the thermistor 320.

[0304] The thermal pad 330 can adhere to the lower surface of the cover plate 120 at a position corresponding to the position of the thermistor 320, and can effectively prevent the thermistor 320 from directly colliding with the cover plate 120 made of rigid material.

[0305] The heating pad 330 can directly contact the cover plate 120 and the thermistor 320 to prevent the heating pad 330 from being damaged by the impact of the cover plate 120, and can also buffer the impact of external force on the thermistor 320 to prevent damage to the thermistor 320.

[0306] Figure 20a This is a plan view showing the state in which the coil substrate 140 is mounted on the support member 130. Figure 21 It is a plan view showing the state in which the second thermal insulator 280 is placed on the upper surface of the support 130.

[0307] A first thermal insulator 270 and a second thermal insulator 280, which are integral, can be formed in the same shape and can be disposed at a position where they overlap.

[0308] For example, such as Figure 20a to Figure 20f and Figure 21 As shown, the first thermal insulator 270 can be arranged spaced apart from each other in the longitudinal direction of the support, and the second thermal insulator 280 can be arranged spaced apart from each other in the longitudinal direction of the support. Each of the first thermal insulators 270 can be integrally formed and extends in the transverse direction of the support. Each of the second thermal insulators 280 can be integrally formed and extends in the transverse direction of the support. Therefore, one first thermal insulator 270 and one second thermal insulator 280 can cover all the plurality of working coils arranged spaced apart from each other in the transverse direction.

[0309] Because of this structure, each of the first thermal insulator 270 and the second thermal insulator 280 can be manufactured to have the largest possible area that can be installed in the electric stove without blocking the slit 1323 through which light emanating from the indicator panel 250 passes.

[0310] In one example, a ventilation hole 137 may be formed in the support member 130 to allow air cooling the coil substrate 140 and ferrite module 150 arranged on top of the support member 130 to be introduced through the ventilation hole. The ventilation hole 137 can also be used as an air exhaust hole through which air introduced into the blower fan 230 is exhausted.

[0311] Ventilation opening 137 can be provided in various embodiments, and each of the embodiments will be described below.

[0312] Figure 20b This is a diagram showing a support member 130 according to another embodiment. Figure 20c It is along Figure 20b A cross-sectional view taken along the 20c-20c direction. The ventilation hole 137 can be formed as a flat plate 135 extending through the support member 130.

[0313] Air forced into the space below the support member 130 by the operation of the blower fan 230 can pass through the ventilation hole 137, thereby passing through the support member 130, and then being introduced into the area located on the top of the support member 130. The air introduced into the area located on the top of the support member 130 can contact the coil substrate 140 and the ferrite module 150 arranged on the upper surface of the support member 130 to cool the coil substrate 140 and the ferrite module 150, thereby effectively suppressing overheating of the coil substrate 140 and the ferrite module 150.

[0314] Ventilation holes 137 may be formed in the area of ​​the plate 135 of the support 130 where the coil substrate 140 and the ferrite module 150 are not arranged, and in the area where the slit 1323 for light from the indicator plate 250 to pass through is not formed.

[0315] For example, such as Figure 20b As shown, a vent 137 may be formed in at least one of the rear edge or the front edge of the support 130. The vent 137 may be formed in an elongated manner along the edge of the support 130.

[0316] Therefore, the ventilation hole 137 can have a longitudinal orientation parallel to the lateral direction of the support member 130. In one example, the ventilation hole 137 can be disposed in the front edge of the support member 130 and can be formed, for example, at the rear of the input interface 160.

[0317] Reference Figure 20c At least a portion of the ventilation holes 137 located at the front or rear edge of the support member 130 can be arranged to face the lower surface of the cover plate 120. Therefore, air introduced through the ventilation holes 137 can contact the lower surface of the cover plate 120 to cool the cover plate 120.

[0318] Furthermore, a space can be defined by the cover plate 120, the second thermal insulator 280, and the thermal pad 330, and forced airflow can flow through this space to cool the entire lower surface of the cover plate 120.

[0319] Therefore, the forced airflow can effectively cool the cover plate 120, which is heated by heat conduction from the heating target, thereby effectively suppressing the heating of each of the components below the cover plate 120.

[0320] Figure 20d This is a diagram illustrating a support member 130 according to another embodiment. A ventilation hole 137 may be provided at each of the two opposite edges of the support member 130. In this respect, the ventilation hole 137 may be formed to be thin and long, and its longitudinal orientation may be parallel to the front-rear direction of the support member 130.

[0321] In one example, in conjunction with Figure 20c In different embodiments shown, the ventilation hole 137 may be provided at the front edge of the support 130 and may be formed, for example, in front of the input interface 160.

[0322] when Figure 20b and Figure 20d When the embodiments shown are combined with each other, the ventilation hole 137 can be formed as thin and elongated along the edge, and is formed in at least one of the front edge, rear edge or two opposite edges of the support 130.

[0323] Figure 20e This is a diagram showing a support member 130 according to another embodiment. Figure 20f It is along Figure 20e A cross-sectional view taken along the 20f-20f direction. For clarity, in... Figure 20f The image shows a first thermal insulator 270, a second thermal insulator 280, and a cover plate 120.

[0324] Ventilation holes 137 can be formed in the central region of the plate 135 of the support member 130 and are located where the coil substrate 140 and ferrite module 150 are not arranged, where the slit 1323 is not formed, and where the first thermal insulator 270 and the second thermal insulator 280 are not arranged.

[0325] The second piece 1322 disposed on the plate 135 can extend continuously along the front-rear direction of the support 130 while being disposed on the plate 135 of the support 130. For example, a vent 137 can be formed in the second piece 1322 and located at a position corresponding to the position between two adjacent slits 1323.

[0326] In other words, such as Figure 20fAs shown, a vent 137 may be formed in the second piece 1322 at a position corresponding to two adjacent slits 1323, so as to extend through the second piece 1322 in the vertical direction. In this case, the vent 137 may be formed in a shape such as circular, elliptical, or polygonal in the plan view.

[0327] In one embodiment, a vent 137 is formed in the support 130, such that the cover plate 120, coil substrate 140 and ferrite module 150 arranged on the top of the support 130 can be effectively cooled by forced airflow, thereby effectively suppressing overheating of the electric stove.

[0328] Figure 22 This is a perspective view showing the coil substrate 140 according to an embodiment. Figure 23 yes Figure 22 Side view. Figure 24 This is a perspective view showing the first thermal insulator 270 according to an embodiment. Figure 25 This is a perspective view showing the entire first thermal insulator 270.

[0329] The first thermal insulator 270 may include a first hole 271 formed at a position corresponding to the position of the thermistor 320, and at least a portion of the thermistor 320 is inserted into the first hole.

[0330] The second thermal insulator 280 may include a second hole 281 formed at a position corresponding to the position of each of the thermistor 320 and the first hole 271, and at least a portion of the thermistor 320 is inserted into the second hole.

[0331] Thermistor 320 can be disposed in coil boundary region 1412, which is defined between coils adjacent to each other along the lateral direction of a plurality of working coils. Some of the first holes 271 and some of the second holes 281 can be formed at positions corresponding to the coil boundary region 1412 between adjacent working coils among the plurality of working coils.

[0332] Some of the thermistors 320 can be disposed in the region where the working coil is arranged, and the remaining thermistors can be disposed in the coil boundary region 1412 between the working coils. Therefore, some of the first holes 271 and some of the second holes 281 can be formed at positions corresponding to the positions of the working coils, while the remaining first holes and second holes can be formed at positions corresponding to the coil boundary region 1412.

[0333] Each of the first hole 271 and the second hole 281 can be configured to have a shape corresponding to the shape of the thermistor 320. For example, when the thermistor 320 is formed into a rectangle, each of the first hole 271 and the second hole 281 can also be formed into a rectangle. The area of ​​each of the first hole 271 and the second hole 281 is larger than the area of ​​the thermistor 320, so that the thermistor 320 can be easily inserted into each of the first hole 271 and the second hole 281.

[0334] When the coil substrate 140, the first thermal insulator 270 and the second thermal insulator 280 are assembled together, the thermistor 320 connected to the upper surface of the coil substrate 140 can be inserted into the first hole 271 and the second hole 281 formed in the first thermal insulator 270 and the second thermal insulator 280 respectively, and can be arranged to contact the thermal pad 330 arranged thereon, or can be arranged to be very close to the thermal pad 330 even if it does not contact it.

[0335] Because of this structure, although the first thermal insulator 270 and the second thermal insulator 280 prevent heat from being transferred from the heating target to the coil substrate 140, the thermistor 320 connected to the coil substrate 140 can be disposed in the first hole 271 and the second hole 281 to receive heat from the heating pad 330 and accurately measure the temperature of the heating target.

[0336] The thermistor 320 receives heat from the heating pad to measure temperature. Therefore, the temperature of the heated target can be measured indirectly. For example, when the cooktop stores and maintains information about the temperature value of a location within the cover 120 (which decreases as the cover extends from bottom to top), the temperature of the heated target can be measured more accurately by adding the decreased temperature value to the temperature actually measured by the thermistor 320.

[0337] As described above, the first thermal insulator 270 and the second thermal insulator 280 can be arranged in various embodiments in which the stacking order and the number of stacks differ from each other. This will be described.

[0338] In one implementation, such as Figure 18 As shown, a first thermal insulator 270 may be disposed on the top of the coil substrate 140, a second thermal insulator 280 may be disposed on the top of the first thermal insulator 270, and a thermal pad 330 may be disposed on the top of the second thermal insulator 280 and may be configured to close the upper end of the second hole 281.

[0339] In this configuration, the coil substrate 140, the first thermal insulator 270, the second thermal insulator 280, and the heating pad 330 can be stacked sequentially from bottom to top in the electric stove. The heating pad 330 can be arranged to adhere to the lower surface of the cover plate 120 and the upper surface of the second thermal insulator 280.

[0340] In this case, the first thermal insulator 270 and the cover plate 120, which are made of solid material, can be prevented from coming into direct contact with each other, and the second thermal insulator 280, which is made of a material resistant to external impact, can be disposed between them.

[0341] Therefore, the first thermal insulator 270, made of a relatively brittle material, can be prevented from being damaged by external impact when it collides with the cover plate 120.

[0342] In another implementation, such as Figure 3 As shown, the electric stove may include a second thermal insulator 280 disposed between the coil substrate 140 and the first thermal insulator 270 in the above-described stacked structure.

[0343] The second thermal insulator 280 is disposed between the coil substrate 140 and the first thermal insulator 270. Therefore, the second thermal insulator 280 protects the first thermal insulator 270, thereby effectively suppressing damage to the first thermal insulator 270 by the coil substrate 140 and the support member 130 connected to the coil substrate 140.

[0344] In another embodiment, a second thermal insulator 280 may be disposed on top of the coil substrate 140, a first thermal insulator 270 may be disposed on top of the second thermal insulator 280, and a thermal pad 330 may be disposed on top of the first thermal insulator 270 and may be configured to close the upper end of the first hole 271.

[0345] In this configuration, the coil substrate 140, the second thermal insulator 280, the first thermal insulator 270, and the heating pad 330 can be stacked sequentially from bottom to top in the electric stove.

[0346] Since the first thermal insulator 270, which has higher thermal insulation performance than the second thermal insulator 280, faces the cover plate 120, the first thermal insulator 270 can effectively block heat from being transferred from the cover plate 120 to the electric stove.

[0347] In this respect, a thermal pad 330 can be disposed between the cover plate 120 and the first thermal insulator 270, and its upper and lower surfaces can be attached to the cover plate 120. Therefore, the thermal pad 330 can protect the first thermal insulator 270 facing the cover plate 120 from impact, thereby preventing the first thermal insulator 270 from being damaged when it collides with the cover plate 120.

[0348] In one example, a second thermal insulator 280 disposed between the first thermal insulator 270 and the coil substrate 140 protects the first thermal insulator 270, thereby effectively suppressing damage to the first thermal insulator 270 by the coil substrate 140 and the support member 130 connected to the coil substrate 140.

[0349] Figure 26 It is along Figure 21 Cross-sectional view of the electric stove in direction 26-26. Figure 27 It is along Figure 21 A cross-sectional view of the electric stove in direction 27-27. To illustrate this clearly, in... Figure 26 and Figure 27 The cover plate 120 is shown in the image. Figure 28 yes Figure 26 Enlarged views of parts 28(a) and 28(b) in the image.

[0350] Figure 29 yes Figure 28 A 3D diagram. For clarity, Figure 29 The cover plate 120 is omitted.

[0351] Figure 26 and Figure 27 It shows that Figure 18 The coil substrate 140, the first thermal insulator 270, the second thermal insulator 280 and the thermal pad 330 shown are stacked in sequence.

[0352] like Figure 26 and Figure 27 As shown, the thermal pad 330 can be disposed between the cover plate 120 and the second thermal insulator 280, and can be arranged to close the upper end of the second hole 281 formed in the second thermal insulator 280.

[0353] like Figure 26 and Figure 27 As shown, the thermistor 320 can be inserted into a first hole 271 formed in the first thermal insulator 270 and a second hole 281 formed in the second thermal insulator 280 so as to face the thermal pad 330. The first thermal insulator 270 and the second thermal insulator 280 can block heat transferred from the heating target in areas other than the first hole 271 and the second hole 281.

[0354] Therefore, the heat generated from the heated target can be transferred to the thermistor 320 via the heating pad 330. The thermistor 320 can use the transferred heat to indirectly measure the temperature of the heated target.

[0355] Reference Figure 28The thermistor 320 may include a body 320a and electrodes 320b. The body 320a may have a sensing chip disposed therein for sensing temperature. The electrodes 320b may be configured as a pair of electrodes disposed on two opposite sides of the body 320a and electrically connected to the sensing chip.

[0356] Reference Figure 29 The main body 320a may have a generally hexahedral shape, wherein curved surfaces are formed at its corners. Electrodes 320b may be respectively disposed on two opposite sides of the main body 320a, and each of them may be disc-shaped.

[0357] A pair of sensor pads P_s and a pair of electrodes 320b printed on the upper surface of the coil substrate 140 can be connected to each other, for example, using a solder joint 320c.

[0358] The solder joint 320c can be attached to the outer surface of the electrode 320b and the upper surface of the sensor pad P_s to electrically connect the electrode 320b and the sensor pad P_s to each other. As long as the electrode 320b and the sensor pad P_s can be electrically connected to each other, the solder joint 320c can have various shapes.

[0359] When the distance between electrode 320b and sensor pad P_s is slightly large, it is difficult to connect electrode 320b and sensor pad P_s to each other using only solder joints. In this case, a lead can be provided to connect electrode 320b and sensor pad P_s to each other, and a solder joint 320c can be formed on the lead to firmly connect electrode 320b and sensor pad P_s to each other.

[0360] When overheating is transferred from the heating target to the thermistor 320, the weldment 320c may melt, and therefore the thermistor 320 may be damaged or malfunction.

[0361] Therefore, in one embodiment, the first thermal insulator 270 and the second thermal insulator 280 can block heat transferred from the heating target in the area other than the first hole 271 and the second hole 281 into which the thermistor 320 is inserted.

[0362] When the working coil 140a operates on the coil substrate 140, considerable heat may be generated in the coil substrate 140. In this regard, the thermistor 320 can be used to measure the temperature of the heat generated in the coil substrate 140 when the body 320a of the thermistor 320 is in contact with or very close to the coil substrate 140.

[0363] The thermistor 320 is intended for measuring the heat transferred from a heated target. However, when the thermistor 320 is used to measure the temperature of the coil substrate 140, the temperature measurement accuracy of the thermistor 320 may decrease. Therefore, it is necessary to sufficiently separate the body 320a of the thermistor 320 from the upper surface of the coil substrate 140 to prevent the thermistor 320 from measuring the temperature of the coil substrate 140.

[0364] For this purpose, a downwardly recessed groove G_th can be formed in the upper portion of the coil substrate 140 and in the area overlapping with the body 320a of the thermistor 320. The shape of the recessed groove G_th can correspond to the shape of the body 320a, but its size can be designed to have a cross-sectional area larger than that of the body 320a. Because of the groove G_th, the body 320a of the thermistor 320 is sufficiently spaced from the coil substrate 140 in the vertical direction, allowing the thermistor 320 to measure the temperature of the heat transferred from the heating target without following the temperature of the coil substrate 140. Therefore, temperature measurement accuracy can be improved.

[0365] In another embodiment, the hole through the coil substrate 140 can be formed in a position and location corresponding to the position and shape of the groove G_th. In another embodiment, the body 320a of the thermistor 320 and the coil substrate 140 can be spaced apart from each other via a space formed as a combination of holes and grooves.

[0366] At least some of the plurality of thermal pads 330 and at least some of the plurality of thermistors 320 may each be in contact with each other. Due to manufacturing defects, assembly tolerances, etc., each of all the plurality of thermistors 320 may not be in contact with each of all the thermal pads 330. Conversely, at least some of the plurality of thermal pads 330 and at least some of the plurality of thermistors 320 may each be in contact with each other.

[0367] However, even when the heating pad 330 and the thermistor 320 are not in contact with each other, they are arranged very close to each other, which can significantly reduce the measurement temperature error caused by non-contact.

[0368] As described above, when the heating pad 330 and the thermistor 320 come into contact with each other, the heating pad 330 may deform due to external force. Therefore, even when the thermistor 320 collides with the heating pad 330, the heating pad 330 will deform to reduce the impact on the thermistor 320, thereby effectively preventing damage to the thermistor 320.

[0369] Figure 30 This is an exploded view showing a temperature sensor 2515-1 as a temperature sensing device according to another embodiment and a sensor holder 2519 supporting the temperature sensor. Figure 31This is a cross-sectional view showing the state in which the temperature sensor 2515-1 is installed in the electric stove. Figure 32 This is a cross-sectional view showing the state in which the temperature sensor 2515-1 and the sensor holder 2519 are connected to each other.

[0370] Figure 30 An embodiment is shown in which a receiving aperture H_th with a circular cross-section is formed through a coil substrate 140 such that a temperature sensor 2515-1 with a circular cross-section can be at least partially inserted into the receiving aperture H_th.

[0371] This disclosure is not limited thereto. However, the disclosure will now be described based on a receiving aperture H_th with a circular cross-section as shown in the figure.

[0372] The cross-sectional area of ​​the receiving aperture H_th can be designed to be larger than the maximum cross-sectional area of ​​the temperature sensor 2515-1 in the horizontal direction.

[0373] As will be described later, the maximum horizontal cross-sectional area of ​​the temperature sensor 2515-1 can be located at the protruding surface portion 2515b-13 of the sensor body 2515b-1.

[0374] Therefore, since the cross-sectional area of ​​the receiving aperture H_th is designed to be larger than the maximum cross-sectional area of ​​the temperature sensor 2515-1 in the horizontal direction, the temperature sensor 2515-1 can be inserted into the receiving aperture H_th without interfering with or contacting the coil substrate 140.

[0375] In one example, the temperature sensor 2515-1 can be configured to be indirectly supported in the receiving hole H_th of the coil substrate 140 while being spaced apart by the sensor holder 2519 from the coil substrate 140.

[0376] As will be described later, the radially outer end of the sensor holder 2519 is coupled to the edge defining the receiving aperture H_th, and the radially inner end of the sensor holder 2519 is coupled to the sensor body 2515b-1 of the temperature sensor 2515-1, such that the temperature sensor 2515-1 can be spaced apart from the receiving aperture H_th and the coil substrate 140. Therefore, the heat generated in the working coil 140a and subsequently conducted to the temperature sensor 2515-1 can be minimized, and the temperature sensor 2515-1 can follow the temperature of the cover plate 120.

[0377] The temperature sensor 2515-1 can be arranged in the electric stove, overlapping the aforementioned thermistor 320 along the vertical direction. Referring below... Figure 30 to Figure 32 A detailed example configuration of the temperature sensor 2515-1 and sensor holder 2519 according to this disclosure is described.

[0378] Reference Figure 30 to Figure 32 The temperature sensor 2515-1 may include: a sensing chip 2515a-1 that generates an output signal related to the sensed temperature; a sensor body 2515b-1 that houses the sensing chip 2515a-1; and a pair of lead cables 2515c-1 electrically connected to the sensing chip 2515a-1 and arranged spaced apart from each other with the sensor body 2515b-1 inserted between them, and electrically connected to the sensing chip 2515a-1.

[0379] Figure 30 to Figure 32 A temperature sensor 2515-1 is shown with the following configuration: a sensing chip 2515a-1 is disposed inside a sensor body 2515b-1 having a generally cylindrical shape and is arranged adjacent to an upper surface 2515b-11 that serves as a temperature sensing surface.

[0380] Each of the pair of lead cables 2515c-1 can pass through the lower end surface 2515b-12 of the sensor body 2515b-1 to extend into the sensor body 2515-b-1, so that one end can be positioned in the sensor body and electrically connected to the sensing chip 2515a-1. As shown, each of the pair of lead cables 2515c-1 can pass through the ferrite core module 27, so that the other end can be electrically connected to the aforementioned motherboard 170.

[0381] Similar to the thermistor 320, the temperature sensor 2515-1 can sense the temperature of the cover plate 120 and indirectly measure the temperature of the heated target. In order to easily sense the temperature of the cover plate 120, the upper surface 2515b-11 of the sensor body 2515b-1, which serves as the temperature sensing surface, can be arranged to be in direct contact with or very close to the heating pad 330.

[0382] As described above, when the heating pad 330 and the temperature sensor 2515-1 come into contact with each other, the heating pad 330 may deform due to external force. Therefore, even when the temperature sensor 2515-1 collides with the heating pad 330, the heating pad 330 will deform to reduce the impact applied to the temperature sensor 2515-1, thereby effectively preventing damage to the temperature sensor 2515-1.

[0383] Furthermore, in a similar manner to the thermistor 320, the temperature sensor 2515-1 can be positioned at a location corresponding to the position of each of the first hole 271 and the second hole 281.

[0384] In one example, the sensor body 2515b-1 may include a protruding surface portion 2515b-13 formed between the upper surface 2515b-11 and the lower surface 2515b-12, and positioned closer to the upper surface 2515b-11.

[0385] As shown in the figure, the protruding surface portion 2515b-13 can be formed as a radially outward protruding cylinder to have a larger outer diameter than each of the upper and lower ends of the sensor body 2515b-1.

[0386] As described above, the protruding surface portion 2515b-13 is formed to have an outer diameter larger than the outer diameter of the lower end of the sensor body 2515b-1. Therefore, as described below, the protruding surface portion 2515b-13 can be used as a stop to prevent the sensor body 2515b-1 from moving downward or being removed from the sensor holder 2519 after the lower end of the sensor body 2515b-1 is attached to the sensor connection portion 2519a of the sensor holder 2519.

[0387] In addition, the electric stove may also include a sensor holder 2519, which supports the temperature sensor 2515-1 in a state where the temperature sensor 2515-1 is spaced apart from the coil substrate 140.

[0388] The sensor holder 2519 may include: a sensor connection portion 2519a, into which a temperature sensor 2515-1 is at least partially inserted and connected; a substrate connection portion 2519b connected to a receiving hole H_th of a coil substrate 140; and a bridging portion 2519c disposed between the sensor connection portion 2519a and the substrate connection portion 2519b, and connecting the sensor connection portion 2519a and the substrate connection portion 2519b to each other.

[0389] The lower end of the sensor body 2515b-1 is moved downward and inserted into the sensor connection portion 2519a. With the lower end of the sensor body 2515b-1 inserted into the sensor connection portion 2519a, the sensor connection portion 2519a is elastically and detachably connected to the lower end of the sensor body 2515b-1, thereby preventing the sensor body 2515b-1 from being removed therefrom.

[0390] As described above, the sensor connection portion 2519a can be formed into a hollow cylindrical shape, which corresponds to the shape of the lower end of the sensor body 2515b-1, which has a cylindrical shape.

[0391] In this respect, the inner diameter of the sensor connection part 2519a can be designed to be slightly smaller than the diameter of the lower end of the sensor body 2515b-1, so that after the lower end of the sensor body 2515b-1 is inserted into the sensor connection part 2519a, the sensor connection part 2519a can be elastically connected to the outer circumferential surface of the lower end of the sensor body 2515b-1.

[0392] Therefore, when the lower end of the sensor body 2515b-1 is inserted into the sensor connection part 2519a, the sensor connection part 2519a can be elastically deformed and elastically connected to the outer circumferential surface of the lower end of the sensor body 2515b-1.

[0393] To allow for easy implementation of elastic connections, the sensor connection portion 2519a may be made of an elastic material, and preferably, a material capable of predetermined elastic deformation (e.g., natural rubber or synthetic rubber) may be selected as its material.

[0394] In one example, the substrate connection portion 2519b is elastically and detachably connected to the edge defining the receiving hole H_th of the coil substrate 140 to prevent the sensor holder 2519 from being removed from the coil substrate 140.

[0395] The substrate connection portion 2519b can be formed to have an annular shape, which has a predetermined radial width corresponding to the shape of the receiving hole H_th having a circular cross-section.

[0396] In this respect, an annular engagement groove 2519b-1 can be formed in the side surface of the sensor connection portion 2519a so as to be recessed inward and in its radial direction so as to be elastically connected to the edge defining the receiving hole H_th of the coil substrate 140.

[0397] The length of the mating groove 2519b-1 in the vertical direction can be formed to be slightly less than the thickness of the coil substrate 140 in the vertical direction.

[0398] Therefore, when the edge defining the receiving hole H_th is inserted into the engagement groove 2519b-1, the substrate connection portion 2519b can be elastically deformed and elastically connected to the edge defining the receiving hole H_th.

[0399] In one example, in order to prevent the substrate connection portion 2519b from being removed from the receiving hole H_th after the engagement groove 2519b-1 is elastically connected to the edge defining the receiving hole H_th, the outer diameter of the engagement groove 2519b-1 can be set to be larger than the diameter of the receiving hole H_th, and the inner diameter of the engagement groove 2519b-1 can be set to be smaller than or equal to the diameter of the receiving hole H_th.

[0400] Therefore, as Figure 31 and Figure 32 As shown, this can effectively prevent the substrate connection portion 2519b from being removed from the receiving hole H_th in the vertical and horizontal directions while it is connected to the receiving hole H_th.

[0401] To allow for easy implementation of the aforementioned elastic connection, the substrate connection portion 2519b can be made of an elastic material, as in the sensor connection portion 2519a described above. Preferably, a material capable of predetermined elastic deformation (e.g., natural rubber, synthetic rubber, etc.) can be selected as the material for the substrate connection portion 2519b.

[0402] In one example, the bridging portion 2519c is used to connect the sensor connection portion 2519a and the substrate connection portion 2519b to each other.

[0403] As shown in the figure, for example, the bridging portion 2519c can be formed in the form of a plate-shaped ring, wherein its radially inner end is integrally connected to the outer circumferential surface of the sensor connection portion 2519a, and its radially outer end is integrally connected to the inner circumferential surface of the substrate connection portion 2519b.

[0404] Therefore, the radial width of the bridging portion 2519c can correspond to the spacing between the sensor connection portion 2519a and the substrate connection portion 2519b.

[0405] In one example, the bridging portion 2519c can be configured such that, with the temperature sensor 2515-1 already connected to the sensor connection portion 2519a and the substrate connection portion 2519b already connected to the edge defining the receiving aperture H_th, pressure is applied to push the upper surface 2515b-11 of the sensor body 2515b-1 toward the cover plate 120.

[0406] Therefore, such as Figure 31 and Figure 32 As shown, the bridging portion 2519c can be formed as a cone shape that is inclined upward and extends from the radially outer end toward the radially inner end.

[0407] In other words, as described above, the bridging portion 2519c is formed in a conical shape so that when the temperature sensor 2515-1 is positioned below the cover plate 120, the bridging portion 2519c can perform a function similar to a disc spring, which generates a restoring force to press the upper surface of the sensor body 2515b-1 toward the cover plate 120.

[0408] In order to facilitate the application of restoring force through elastic deformation, the bridging portion 2519c can be made of an elastic material in the same manner as the sensor connection portion 2519a and the substrate connection portion 2519b described above, and preferably, a material capable of predetermined elastic deformation (e.g., natural rubber, synthetic rubber, etc.) can be selected as the material of the bridging portion 2519c.

[0409] In another example, at least one vent may be provided, which is formed as a bridging portion 2519c passing through the sensor holder 2519 in the vertical direction.

[0410] The ventilation holes effectively prevent the coil substrate 140 from overheating and also suppress the phenomenon that the temperature sensor 2515-1 follows the temperature of the coil substrate 140 due to the heating of the working coil 140a.

[0411] In one example, the sensor holder 2519 is configured as a cylinder, and accordingly, each of the first hole 271 and the second hole 281 can be formed as a circle in the plan view.

[0412] Although this disclosure has been described above with reference to the accompanying drawings, it is not limited to the embodiments disclosed herein and in the drawings, and it will be apparent to those skilled in the art that various modifications can be made to it within the scope of the technical concept of this disclosure. Furthermore, even if the effects of configurations according to this disclosure are not explicitly described in the description of embodiments of this disclosure, it is clear that the effects foreseeable from the configurations should be acknowledged.

Claims

1. An electric stove, the electric stove comprising: shell; A cover plate is attached to the upper end of the housing, wherein the heating target is placed on the upper surface of the cover plate; Support member, which is housed within the housing; A plurality of coil substrates are disposed on top of the support and arranged spaced apart from each other, wherein a working coil is printed on each of the plurality of coil substrates; and A first thermal insulator is disposed between the support member and the cover plate.

2. The electric stove according to claim 1, wherein, The electric stove also includes a plurality of thermistors disposed on the upper surface of the working coil or on at least one of the coil boundary regions defined between adjacent working coils of the plurality of working coils, wherein the plurality of thermistors are arranged to be spaced apart from each other.

3. The electric stove according to claim 2, wherein, The electric stove also includes a plurality of heating pads, which are respectively disposed at positions corresponding to the positions of the plurality of thermistors and are arranged to be spaced apart from each other, wherein at least some of the plurality of heating pads are configured to contact the lower surface of the cover plate.

4. The electric stove according to claim 3, wherein, The electric stove further includes a second thermal insulator disposed between the support member and the cover plate, wherein the second thermal insulator is disposed on at least one of the upper surface or the lower surface of the first thermal insulator. The first thermal insulator includes a first hole formed at a position corresponding to the location of the thermistor, wherein at least a portion of the thermistor is inserted into the first hole. The second thermal insulator includes a second hole formed at a position corresponding to the position of each of the thermistor and the first hole, wherein at least a portion of the thermistor is inserted into the second hole.

5. The electric stove according to claim 4, wherein, The first thermal insulator is disposed on the top of the coil substrate, and the second thermal insulator is disposed on the top of the first thermal insulator. The thermal pad is disposed on top of the second thermal insulator and is configured to close the upper end of the second hole.

6. The electric stove according to claim 5, wherein, The second thermal insulator is also disposed between the coil substrate and the first thermal insulator.

7. The electric stove according to claim 4, wherein, The second thermal insulator is disposed on the top of the coil substrate, and the first thermal insulator is disposed on the top of the second thermal insulator. The thermal pad is disposed on top of the first thermal insulator and is configured to close the upper end of the first hole.

8. The electric stove according to claim 4, wherein, The first thermal insulator includes first thermal insulators arranged spaced apart from each other in the longitudinal direction of the electric stove, wherein each of the first thermal insulators is a single body extending in the transverse direction of the electric stove. The second thermal insulator includes second thermal insulators arranged spaced apart from each other in the longitudinal direction of the electric stove, wherein each of the second thermal insulators is a single body extending in the transverse direction of the electric stove. Each of the first thermal insulator and the second thermal insulator covers the entire array of the plurality of working coils arranged to be spaced apart from each other in the lateral direction of the electric stove.

9. The electric stove according to claim 8, wherein, The thermistor is disposed on the coil boundary region defined between adjacent working coils of the plurality of working coils arranged to be spaced apart from each other in the lateral direction. Some of the first holes in the first hole and some of the second holes in the second hole are formed at positions corresponding to the boundary region of the coil.

10. The electric stove according to claim 1, wherein, The electric stove also includes: A motherboard, the motherboard being attached to the lower surface of the support member, and including a controller configured to control the electric stove; A switch-mode power supply SMPS board is connected to the lower surface of the support member and supplies power to the electric stove; An EMI filter, coupled to the lower surface of the support member, suppresses electromagnetic interference generated by electricity; and An inverter board is attached to the lower surface of the support member and applies a resonant current to the operating coil.

11. The electric stove according to claim 1, wherein, The electric stove also includes: A blower fan, connected to the lower surface of the support member and positioned at a distance from the main board, SMPS board, EMI filter, and inverter board; and A radiator is disposed below the support member and has a longitudinal direction parallel to the air discharge direction of the blower fan.

12. The electric stove according to claim 2, wherein, The working coil is printed in multiple layers on the coil substrate, and the thermistor is integrally connected to the coil substrate.

13. The electric stove according to claim 1, wherein, The electric stove also includes a support plate, which is disposed below the support member and supports the support member. The support plate is made of an electrically insulating material.

14. An electric stove, the electric stove comprising: shell; A cover plate is attached to the upper end of the housing, wherein the heating target is placed on the upper surface of the cover plate; Upper support member, which is housed within the housing; A plurality of coil substrates are disposed on the top of the upper support and arranged spaced apart from each other, wherein a working coil is printed on each of the coil substrates. A first thermal insulator is disposed between the upper support and the cover plate; and A second thermal insulator is disposed between the upper support and the cover plate, and is disposed on at least one of the upper or lower surfaces of the first thermal insulator.

15. The electric stove according to claim 14, wherein, The electric stove also includes: A plurality of thermistors are disposed on the upper surface of the working coil or in at least one of the coil boundary regions defined between adjacent working coils, wherein the plurality of thermistors are arranged spaced apart from each other; and A plurality of thermal pads are disposed at positions corresponding to the positions of the plurality of thermistors and arranged spaced apart from each other, wherein at least some of the thermal pads are configured to contact the lower surface of the cover plate.

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