(19)
(11)EP 3 651 551 A1

(12)EUROPEAN PATENT APPLICATION

(43)Date of publication:
13.05.2020 Bulletin 2020/20

(21)Application number: 19207383.1

(22)Date of filing:  06.11.2019
(51)Int. Cl.: 
H05B 6/12  (2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 08.11.2018 KR 20180136324

(71)Applicant: LG Electronics Inc.
SEOUL, 07336 (KR)

(72)Inventors:
  • KIM, Seongjun
    Seoul 08592 (KR)
  • YANG, Jaekyung
    Seoul 08592 (KR)
  • LEE, Yongsoo
    Seoul 08592 (KR)

(74)Representative: Vossius & Partner Patentanwälte Rechtsanwälte mbB 
Siebertstrasse 3
81675 München
81675 München (DE)

  


(54)INDUCTION HEATING DEVICE HAVING IMPROVED FERRITE CORE SHAPE


(57) According to an embodiment of the present disclosure, the induction heating device includes a working coil including a conducting wire wound in an annular shape and an individual terminal and a common terminal connected to the conducting wire, respectively, a ferrite core placed below the working coil to diffuse an alternating magnetic field generated by the working coil upward, and having corners being bent stepwise, a base plate in which the ferrite core is provided on an upper surface of the base plate and defining a connection hole having a shape corresponding to a shape of the corner of the ferrite core, and an indicator substrate installed below the base plate and in which the connector coupled to the common terminal is formed on the upper surface of the indicator substrate and the connector coupled to the common terminal protrudes upward from the connection hole.




Description


[0001] An induction heating device having an improved shape of a ferrite core is disclosed herein.

[0002] Various types of cooking utensils may be used to heat food in homes and restaurants. In related art, gas ranges use gas as fuel. However, in recent years, there has been an increase in the use of devices that may heat a cooking vessel such as an object, for example, a pot, with electricity instead of gas.

[0003] A method of heating an object via electricity may be classified into a resistive heating method and an induction heating method. In the electrical resistive method, heat may be generated based on current flowing through a metal resistance wire or a non-metallic heating element, such as silicon carbide, and may be transmitted to the object (e.g., the cooking vessel) through radiation or conduction, to heat the object. In the induction heating method, eddy current may be generated in the object made of metal based on a magnetic field generated, around the coil, when a high-frequency power of a predetermined magnitude is applied to the coil to heat the object.

[0004] The induction heating devices that use an induction heating method generally include working coils respectively in corresponding regions to heat each of a plurality of objects (e.g., a cooking vessel).

[0005] However, an induction heating device (i.e., a zone-free type induction heating device) that simultaneously heats one object with a plurality of working coils has been widely used.

[0006] In such a zone-free type induction heating device, the object may be inductively heated regardless of a size and a position of the object in a region in which a plurality of working coils are present.

[0007] US Patent No. 8440944B2 discloses a working coil assembly provided in the induction heating device in related art. The working coil assembly in related art is described with reference to the above configuration.

[0008] FIGS. 1 to 3 respectively show a working coil assembly provided in an induction heating device in related art.

[0009] For reference, FIGS. 1 to 3 are disclosed in US Patent No. 8440944B2.

[0010] Referring to FIGS. 1 to 3, a working coil assembly 10 provided in the induction heating device in related art may include a working coil 16, mica sheets 18 and 20, and a ferrite core 26.

[0011] Specifically, the working coil 16 may generate an alternating magnetic field, and the ferrite core 26 may diffuse the alternating magnetic field generated by the working coil 16 (i.e., upward), and the mica sheets 18 and 20 may prevent heat generated by the working coil 16 from being directly transferred to the ferrite core 26.

[0012] The working coil 16 may also have a circular outer contour 22 and the ferrite core 26 may have a radial outer edge 24. The ferrite core 26 has a hexagonal shape and a size of the ferrite core 26 may be greater than the size of the working coil 16.

[0013] For reference, the ferrite core enables the magnetic flux generated by the working coil to direct upward. As the ferrite core has a size greater than the size of the working coil, an amount of magnetic flux being leaking below the working coil may be reduced. Thus, the ferrite core has the size greater than the size of the working coil and high-output may be obtained based on a relatively less current.

[0014] Meanwhile, in the induction heating device in related art, a moving path 36 for a terminal (38; i.e., an individual terminal and a common terminal) of the working coil 16 may be provided on the ferrite core 26 to prevent contact between the terminal of the ferrite core 26 and the terminal (38; i.e., the individual terminal and the common terminal) of the working coil 16. Further, in the induction heating device in related art, a small-sized working coil is used to provide a distance between ferrite cores and a creeping distance to prevent electric shock accidents.

[0015] Therefore, in the induction heating device in related art, the terminal 38 of the working coil 16 may be tied using a housing and may be fastened to a resonance substrate (not shown).

[0016] However, when the terminal 38 of the working coil 16 is tied using the housing and is fastened to the resonance substrate, a resonance capacitor (not shown) may be disposed below the working coil 16 (i.e., the working coil 16 and the resonance capacitor may have a one-to-one correspondence). That is, when the zone-free type induction heating device uses the above-described fastening method, the size of the product may be increased due to the resonance capacitor disposed in the product.

[0017] Further, unlike other induction heating devices in related art, when a high-output working coil (i.e., a large-sized working coil) is used, the common terminal and the individual terminal of the working coil may not be tied using the housing. As the size of the resonance capacitor is increased based on the output of the working coil, so that it is difficult to provide a space in the product, to place a plurality of resonance capacitors.

SUMMARY



[0018] The invention is specified by the independent claim. Preferred embodiments are defined in the dependent claims.

[0019] The present disclosure provides an induction heating device capable of using a high-output working coil.

[0020] The present disclosure also provides an induction heating device in which contact between a terminal of a ferrite core and a terminal of a working coil is prevented.

[0021] The objects of the present disclosure are not limited to the above-mentioned objects, and other objects and advantages of the present disclosure which are not mentioned may be understood by the following description and more clearly understood by the embodiments of the present disclosure. It will also be readily apparent that the objects and advantages of the present disclosure may be implemented by means defined in claims and a combination thereof.

[0022] According to the present disclosure, the induction heating device may provide a creeping distance to insulate the working coil by adding an insulating member, rather than a reduction of a size of the working coil, so that the induction heating device may use a high-output working coil.

[0023] Further, according to the present disclosure, the induction heating device may include a ferrite core having corners bent stepwise, a base plate defining a connection hole having a shape corresponding to a shape of the corner of the ferrite core, and an indicator substrate in which a connector coupled to a common terminal of the working coil is provided on an upper surface of the indicator substrate and the connector coupled to the common terminal of the working coil protrudes upward through a connection hole, thereby preventing the contact between the terminal of the ferrite core and the terminal of the working coil.

[0024] According to the present disclosure, the induction heating device may use the high-output working coil, thereby improving performance and reliability of the product.

[0025] Further, according to the present disclosure, the induction heating device may prevent electric shock accidents by preventing contact between the terminal of the ferrite core and the terminal of the working coil, thereby improving user satisfaction.

[0026] Hereafter, a specific effect of the present disclosure, further to the above-mentioned effect, is described together while describing a specific matter for implementing the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS



[0027] 

FIGS. 1 to 3 respectively show a working coil assembly provided in an induction heating device in related art.

FIG. 4 is a plan view showing of an induction heating device according to an embodiment of the present disclosure.

FIG. 5 is an exploded perspective view of the induction heating device in FIG. 4.

FIG. 6 is a cross-sectional view with respect to FIG. 5.

FIGS. 7 to 9 are partially enlarged views of the induction heating device in FIG. 4.

FIGS. 10 to 11 show working coil assemblies shown in FIG. 4.

FIG. 12 is a plan view illustrating enlarged area 'A' shown in FIG. 4.


DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS



[0028] The above mentioned objects, features, and advantages of the present disclosure are described in detail with reference to the accompanying drawings, so that those skilled in the art to which the present disclosure pertains may easily implement the technical idea of the present disclosure. In the description of the present disclosure, when it is determined that the detailed description of the known technology related to the present disclosure may obscure the gist of the present disclosure, the detailed description thereof is omitted. Hereinafter, preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings. A same reference numeral in the drawings is used to indicate same or similar component. It will be understood that, although the terms "first", "second", and the like may be used herein to describe various components, however, these components should not be limited by these terms. These terms are only used to distinguish one component from another component. Thus, a first component may be a second component unless otherwise stated.

[0029] Hereinafter, when any component is arranged in "an upper portion (or a lower portion)" of the component or "on (or under") of the component, any component may be arranged in contact with an upper surface (or a lower surface) of the component, and another component may be interposed between the component and any component arranged on (or under) the component.

[0030] Further, when one component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or able to be connected to the other component; however, it is also to be understood that an additional component may be "interposed" between the two components, or the two components may be "connected", "coupled" or "connected" through an additional component. Unless otherwise stated, each component may be singular or plural throughout the disclosure.

[0031] As used herein, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In the present disclosure, it should not be construed that terms such as "including" or "comprising" necessarily include various types of components or various steps described in the present disclosure, and it should be construed terms such as "including" or "comprising" do not include some components or some steps or may include additional components or steps.

[0032] Unless otherwise stated, "A to B" means "A or more and B or less.

[0033] Hereinafter, according to an embodiment of the present disclosure, an induction heating device is described.

[0034] FIG. 4 is a plan view of an induction heating device according to an embodiment of the present disclosure. FIG. 5 is an exploded perspective view of the induction heating device in FIG. 4. FIG. 6 is a cross-sectional view in FIG. 5. FIGS. 7 to 9 are partially enlarged views of the induction heating device in FIG. 4.

[0035] For reference, for convenience of explanation, in FIGS. 4 and 7 to 9, the cover plate is omitted. For convenience of explanation, in FIG. 7, a light guide is omitted.

[0036] Referring to FIGS. 4 to 9, according to an embodiment of the present disclosure, an induction heating device 1 may include a case 125, a cover plate 119, a base plate 145, and an indicator substrate support 170, an indicator substrate 175, a light emitting element 177, a light guide 210, an electro-magnetic interference (EMI) filter 235, a switched mode power supply (SMPS) 236, a first blowing fan to a third blowing fan 240, 250, and 260, an input interface 300, and a controller for input interface 310, a working coil assembly WCA, a resonance substrate R_PCB, and an inverter substrate IV_PCB.

[0037] The case 125 may include various types of components included in the induction heating device 1, for example, a working coil assembly WCA, a base plate 145, an indicator substrate support 170, an indicator substrate 175, a light emitting element 177, a light guide 210, an EMI filter 235, a SMPS 236, a first blowing fan to a third blowing fan 240, 250, and 260, a controller for input interface 310, a working coil assembly WCA, a resonance substrate R_PCB, and an inverter substrate IV_PCB.

[0038] Further, the case 125 may include various types of devices related to the driving of the working coil WC (e.g., a power supply (not shown) that provides an alternating current (AC) power (i.e., input power), a controller for an inverter substrate (not shown) that controls the driving of components of the inverter substrate IV_PCB, a relay (not shown) or a semiconductor switch (not shown) that turns on or turns off the working coil WC, but details of various types of devices related to the driving of the working coil WC are omitted.

[0039] Further, the case 125 may be thermally insulated to prevent heat generated by the working coil WC from being leaking to the outside.

[0040] Further, the case 125 may include a lower plate LPA and a side plate SPA that extends upward along an edge of the lower plate LPA.

[0041] Inlets (not shown) and exhaust slits (now shown) may be defined at a portion of an area of the lower plate LPA. Further, inlet slits IS_S and IS_L and an additional exhaust slit DS_S, may be defined in a remaining area of the lower plate LPA and the side plate SPA. Details of the inlet, inlet slit, and the exhaust slit are described below in detail.

[0042] For reference, an inlet and exhaust slit IDS may also be defined on the side plate SPA, and air may move to an inside of and to an outside of the case 125 through the inlet and exhaust slit IDS.

[0043] Further, a barrier BA may be installed at a periphery of an area, on the lower plate LPA of the case 125, where the controller for the input interface 310 is installed, and the barrier BA may extend upward from the periphery of the area where the controller for the input interface 310 is installed.

[0044] Specifically, the barrier BA may be made of, for example, metal, and may prevent heat generated due to the driving of peripheral components from being introduced into the controller for the input interface 310 and the input interface 300.

[0045] For reference, a silicone rubber may be inserted between an upper end of the barrier BA and a lower surface of the top plate 115.

[0046] A mica sheet MS may be provided between the lower plate LPA and the inverter substrate IV_PCB to insulate the lower plate LPA and the inverter substrate IV_PCB, of the case 125.

[0047] Specifically, one surface of the mica sheet MS may be attached to the lower plate LPA through a sealant, and the other surface of the mica sheet MS may contact a heat sink (i.e., a heat sink that radiates the heat for the inverter described below) provided on the inverter substrate IV_PCB.

[0048] Further, the first blowing fan 240 and the second blowing fan 250 may be installed on the lower plate LPA of the case 125.

[0049] Specifically, the first blowing fan 240 may be installed on the lower plate LPA, and may suction outside air through the inlet (not shown) provided in the lower plate LPA to discharge the air to the inverter substrate IV_PCB.

[0050] More specifically, the air may be discharged from the first blowing fan 240 to the inverter substrate IV_PCB and may be guided rearward through the inverter substrate IV_PCB. The air guided rearward may be discharged below the lower plate LPA (i.e., the outside of the case 125) through the exhaust slit (not shown) provided on the lower plate LPA.

[0051] As described above, as heat generated by the inverter substrate IV_PCB is easily discharged below the lower plate LPA, it is possible to resolve the heating of the inverter substrate IV_PCB, in particular, the inverter (not shown). That is, a temperature of the inverter may be reduced due to the air discharged from the first blowing fan 240 to the inverter substrate IV_PCB.

[0052] Meanwhile, the second blowing fan 250 may be installed on the lower plate LPA and may suction the outside air through the inlet (not shown) provided in the lower plate LPA and may discharge the air to the resonance substrate R_PCB.

[0053] More specifically, the air may be discharged from the second blowing fan 250 to the resonance substrate R_PCB and may be guided rearward through the resonance substrate R_PCB. The air guided rearward may be discharged below the lower plate LPA (i.e., the outside of the case 125) through the exhaust slit (not shown) provided in the lower plate LPA.

[0054] As described above, as the heat generated by the resonance substrate R_PCB is easily discharged below the lower plate LPA, it is possible to resolve the heating of the resonance substrate R_PCB, in particular, the resonance capacitor (not shown). That is, the temperature of the resonance capacitor may be reduced due to the air discharged from the second blowing fan 250 to the resonance substrate R_PCB.

[0055] The cover plate 119 may be coupled to an upper end of the case 125 (i.e., an upper end of the side plate SPA) to close an inside of the case 125, and an object (not shown) may be disposed on the upper surface of the cover plate 119.

[0056] Specifically, the cover plate 119 may include a top plate 115 to place the object such as a cooking vessel, and the heat generated by the working coil WC may be transmitted to the object through the top plate 115.

[0057] The top plate 115 may be made of, for example, glass. Further, the input interface 300 may be flatly buried on the top plate 115 to receive input from a user and transmits the input to the controller for input interface 310, but is not limited thereto. That is, the input interface 300 may be installed at a position other than the top plate 115.

[0058] For reference, the input interface 300 includes a module that inputs a heating intensity or driving time of the induction heating device 1 desired by the user, and may be variously implemented with a physical button or a touch panel. Further, the input interface 300 may include, for example, a power button, a lock button, a power level control button (+,-), a timer control button (+,-), a charging mode button, and the like, and may display a specific image (e.g., an image of a heating zone, an image of a heating intensity, and the like).

[0059] Further, the input interface 300 may transfer the input received from the user to the controller for the input interface 310, and the controller for the input interface 310 may transfer the input to the above-described controller (i.e., the controller for the inverter substrate). Details thereof are omitted.

[0060] Meanwhile, the working coil assembly WCA may include a working coil WC, a ferrite core 126, and a first mica sheet 120 (which is different from the above-mentioned mica sheet MS), an insulating member 150.

[0061] For reference, when the induction heating device 1 is a zone-free type induction heating device, a plurality of working coil assemblies WCAs may be present as shown in FIGS. 4 to 9, and a plurality of working coil assemblies (e.g., the WCAs) may be spaced apart from one another by a predetermined distance.

[0062] However, for convenience of description, one working coil assembly WCA is described.

[0063] Specifically, the working coil WC may include a conducting wire annularly wound with a plurality of times and may generate an alternating magnetic field. Further, the first mica sheet 120 and the ferrite core 126 may be sequentially disposed below the working coil WC.

[0064] For reference, in one embodiment of the present disclosure, unlike other induction heating devices in related art, the size of the working coil WC is not reduced, and thus the AC magnetic field having the high-output may be generated.

[0065] The ferrite core 126 may be disposed below the working coil WC, and a core hole (127 in FIG. 10) may be defined at a central portion of the ferrite core 126 to overlap with an annular inner side of the working coil WC in a height direction HD in which the indicator substrate, the base plate, the ferrite core, the first mica sheet, and the working coil are stacked.

[0066] Specifically, the base plate 145 may be disposed below the ferrite core 126, and a first mica sheet 120 may be disposed between the ferrite core 126 and the working coil WC.

[0067] The ferrite core 126 may be fixed to the first mica sheet 120 through the sealant, and may function to diffuse an alternating magnetic field generated by the working coil WC upward (i.e., above the ferrite core 126).

[0068] Further, an insulating member 150 may be attached to the outer portion of the ferrite core 126, and a corner of the ferrite core 126 may be bent stepwise (e.g., the corner of the ferrite core 126 may be bent inward so that the corner of the ferrite core 126 corresponds to the corner of the connection hole 172 described below).

[0069] For reference, the corners of the ferrite core 126 are located at both ends of the outer portion of the ferrite core 126, a detailed description of the above configuration is described below.

[0070] The first mica sheet 120 may be provided between the working coil WC and the ferrite core 126 and a first sheet hole (121 in FIG. 10) may be provided at a center of the first mica sheet 120 to overlap with the annular inner side of the working coil WC in the height direction HD.

[0071] Specifically, the first mica sheet 120 may be fixed to the working coil WC and the ferrite core 126 through the sealant, and may prevent the heat generated by the working coil WC from being directly transferred to the ferrite core 126.

[0072] For reference, although not shown in the figures, the induction heating device 1 may further include a second mica sheet (not shown) fixed to the upper end of the working coil WC through the sealant and defining a second sheet hole (not shown) at the center of the second mica sheet to overlap with the annular inner side of the working coil WC in a height direction HD thereof, but details of the above configuration are omitted.

[0073] The insulating member 150 may be attached to an outer portion of the ferrite core 126 to insulate between the working coil WC and the base plate 145.

[0074] Further, the insulating member 150 may include, for example, a Kapton tape.

[0075] As shown in FIGS. 7 to 9, the working coil assembly WCA may further include a packing gasket 149 that fixes the first mica sheet 120 and the ferrite core 126 to the base plate 145 and a sensor 148 installed at an upper end of the packing gasket 149 to detect a temperature.

[0076] For reference, the sensor 148 may detect the temperature of the top plate 115, the temperature of the working coil WC, and the operation of the working coil WC and may transmit temperature information or operation information to the above-mentioned controller for input interface 310.

[0077] As described above, the working coil assembly WCA includes the above-mentioned components, and details of components are described below.

[0078] The working coil assembly WCA is installed on an upper surface of the base plate 145.

[0079] Specifically, the ferrite core 126, the first mica sheet 120, and the working coil WC are sequentially stacked on the base plate 145, and the base plate 145 may be spaced upward from the indicator substrate support 170.

[0080] Further, the base plate 145 may be integrated, for example, and may be made of aluminum (A), but is not limited thereto.

[0081] For reference, the indicator substrate 175 may be installed on the upper surface of the indicator substrate support 170 and may be spaced downward from the base plate 145. Accordingly, an air flow path described below may be provided between the base plate 145 and the indicator substrate 175. Details thereof are described below.

[0082] Meanwhile, as shown in FIGS. 7 to 9, a connection hole 172 may be provided in the space between the ferrite cores on the base plate 145 to provide a space of the connector 171. The connector 171 may be coupled (i.e., connected) to a terminal WCT (i.e., a common terminal) of the working coil WC disposed at the periphery of the connector 171.

[0083] The connection hole 172 may be provided at a position corresponding to an oblique direction of the ferrite core 126 so that the connection hole 172 has a shape corresponding to a shape of the corner of the ferrite core 126 (e.g., a rectangular shape of the connection hole 172 or a rectangular shape of the connection hole 172 in which a portion of the corner of the connection hole 172 is bent stepwise). The connector 171 may protrude upward from the upper surface of the indicator substrate 175 to arrange wires and perform electrical connection of the working coils WCs (i.e., the connector 171 may be spaced inward apart from an edge of the connection hole 172), and details of the above configuration are described below.

[0084] For reference, the working coil WC may include a common terminal WCT coupled to the connector 171, with terminals of the surrounding working coils and an individual terminal (not shown) connected to the resonance substrate described below (R_PCB in FIG. 5; i.e., the resonance capacitor). Further, the common terminal WCT and the individual terminal are respectively connected to the conducting wire WCL of the working coil WC, and the common terminal WCT is connected to the inverter substrate (IV_PCB in FIG. 5; i.e., the inverter) described above) through the connector 171. Details thereof are omitted.

[0085] The third blowing fan 260 may be installed at one side of the lower surface of the base plate 145 and may suction the outside air (e.g., outside cool air) through the inlet slits IS_L and IS_S defined in the lower plate LPA and the side plate SPA of the case 125, and may discharge the air to the air flow path defined between the base plate 145 and the indicator substrate 175.

[0086] More specifically, as shown in FIG. 5, an upper fence HDF is provided on the upper surface of the indicator substrate support 170 and the upper fence HDF is provided along an edge of the upper surface of the indicator substrate support 170. The air flow path may be surrounded by the lower surface of the base plate 145, the upper surface of the indicator substrate 175, and the upper fence HDF.

[0087] Further, the base plate 145 may be integrated, and the air flow path may be surrounded by the lower surface of the base plate 145, the upper surface of the indicator substrate 175, and the upper fence HDF. The air may be discharged from the third blowing fan 260 to the air flow path and may be discharged to the outside of the case 125 through the additional exhaust slits DS_S. The air may be discharged by the third blowing fan 260 and may move along the air flow path, to reduce the temperature of the working coil WC and the temperature of the indicator (in particular, a plurality of light emitting elements (e.g., 177)).

[0088] That is, as the cool air is circulated along the air flow path, the temperature of the working coil WC and the temperature of the indicator (in particular, the plurality of light emitting elements (e.g., 177) may be reduced. Further, the heating of the working coil WC and the indicator (in particular, the plurality of light emitting elements (e.g., 177)) generated due to radiation and a convection current may be resolved.

[0089] The light guide 210 may be installed on the base plate 145.

[0090] Specifically, the light guide 210 may be installed on the base plate 145 to be provided around the working coil WC. That is, four light guides (e.g., 210) per one working coil WC may be installed around the working coil WC (i.e., light guides are arranged on four surfaces of the outer portions of the working coil).

[0091] The light guide 210 may display whether the working coil WC is driven and output intensity of the working coil WC through a light emitting surface (i.e., an upper surface).

[0092] As shown in FIGS. 7 and 8, a light guide installation hole 147 to install the light guide 210 may be defined in the space between the ferrite cores, in the base plate 145. That is, the light guide installation hole 147 may be defined in the base plate 145 at the position in which the light guide 210 is installed. Accordingly, the light guide installation hole 147 may also be defined around the working coil WC, and four light guide installation holes (e.g., reference numeral 147) per one working coil WC may be defined around the working coil WC.

[0093] Of course, the light guide installation hole 147 may not overlap with a connection hole 172, and the number of the light guide installation holes 147 may be the same as the number of the light guides 210.

[0094] For reference, light emitted by the light emitting element 177 installed on the indicator substrate 175 may be transmitted to the light guide 210 through the light guide installation hole 147, and the light guide 210 may display the light emitted by the light emitting element 177 through the light emitting surface (i.e., the upper surface) provided at the upper end thereof.

[0095] The indicator substrate 175 may be installed on the upper surface of the indicator substrate support 170 to be spaced downward from the base plate 145, and a plurality of light emitting elements (e.g., reference numeral 177) may be installed on the upper surface of the indicator substrate 175.

[0096] The plurality of light emitting elements (e.g., reference numeral 177) may be, for example, light emitting diodes (LEDs), and the plurality of light emitting elements (e.g., reference numeral 177) may be symmetrical with respect to a center of the lower surface of the light guide 210, but is not limited thereto.

[0097] Further, the connector 171 coupled to the common terminal WCT of the above-mentioned working coil WC may be provided on the upper surface of the indicator substrate 175 and the connector 171 coupled to the common terminal WCT of the above-mentioned working coil WC may protrude upward from the connection hole 172.

[0098] The plurality of connectors 171 may be provided and details thereof are described below.

[0099] For reference, the indicator substrate 175 may have, for example, a form of a printed circuit board (i.e., PCB), and may drive a plurality of light emitting elements (e.g., 177) based on the control signal received from the above-mentioned controller for the inverter substrate or the controller for the input interface 310. Further, although not shown in the figures, various types of components may further be installed on the indicator substrate 175 to drive the plurality of light emitting elements (e.g., 177).

[0100] The indicator substrate support 170 may be coupled to the lower plate LPA to be disposed below the working coil WC.

[0101] Further, the above-described upper fence HDF may be provided on the upper surface of the indicator substrate support 170, and a lower fence LDF may be provided on the lower surface of the indicator substrate support 170.

[0102] That is, the upper fence HDF of the indicator substrate support 170 supports the lower surface of the base plate 145, and the lower fence LDF of the indicator substrate support 170 may be supported by the lower plate LPA.

[0103] Further, the indicator substrate 175 may be installed on the upper surface of the indicator substrate support 170 and the EMI filter 235, the SMPS 236, the resonance substrate R_PCB, and the inverter substrate IV_PCB may be installed on the lower surface of the indicator substrate support 170.

[0104] The EMI filter 235 may be installed on the lower surface of the indicator substrate support 170 and may receive the AC power from the above-described power supply (not shown). Further, the EMI filter 235 may reduce noise of the received AC power (i.e., electro-magnetic interference (EMI)) and provide the SMPS 236 with the AC power with reduced noise.

[0105] The SMPS 236 may be installed on the lower surface of the indicator substrate support 170, and may receive, from the EMI filter 235, the AC power with reduced noise. Further, the SMPS 236 may convert the received AC power into DC power and may provide the inverter substrate IV_PCB with the converted DC power.

[0106] The inverter substrate IV_PCB may be installed on the lower surface of the indicator substrate support 170 and may include the inverter (not shown) that applies the resonance current to the working coil WC through the switching operation and a heat sink (not shown) that radiates heat of the inverter.

[0107] The inverter IV may receive the DC power from the SMPS 236 and may apply a resonance current to the working coil WC by performing a switching operation based on the received DC power.

[0108] Further, a plurality of inverters may be provided, and the switching of the inverter may be controlled by the controller for the inverter substrate described above.

[0109] The inverter may include two switching elements (not shown), and the two switching elements may be alternately turned on and off based on a switching signal received from the controller for the inverter substrate. Further, high frequency alternating current (i.e., resonance current) may be generated through the switching of the two switching elements, and the generated high frequency alternating current may be applied to the working coil WC.

[0110] For reference, the inverter may be connected to a common terminal WCT of the above-mentioned working coil WC.

[0111] The resonance substrate R_PCB may be installed on the lower surface of the indicator substrate support 170, and may include a resonance capacitor (not shown) that resonates by the switching of the inverter and a heat sink (not shown) that radiates the heat of the resonance capacitor.

[0112] The resonance capacitor resonates, when a resonance current is applied to the working coil WC by the switching operation of the inverter. Further, when the resonance capacitor resonates, an amount of a current flowing through the working coil WC connected to the resonance capacitor C increases. That is, an eddy current may be induced into the object disposed above the working coil WC connected to the resonance capacitor through this process.

[0113] For reference, a plurality of resonance capacitors may be provided and may be connected to respective terminals of the above-mentioned working coil WC.

[0114] Meanwhile, according to an embodiment of the present disclosure, the induction heating device 1 may also perform a function for transmitting wireless power based on the above-mentioned configuration and feature.

[0115] That is, power is wirelessly supplied and is applied to a plurality of electronic devices. Electronic devices that use a technology for transmitting wireless power are charged by simply placing the electronic devices on a charging pad without connecting the electronic device to an additional charge connector. The electronic devices that transmit the wireless power may not require a wired cord or a charger, thereby improving portability of the electronic devices and reducing a size and a weight of the electronic devices.

[0116] The technology for transmitting the wireless power may use an electromagnetic induction method using a coil, a resonance method using resonance, and a radio wave radiation method in which electrical energy is converted into a microwave and the converted microwave is transmitted. The electromagnetic induction method uses electromagnetic induction between a primary coil (e.g., a working coil WC) provided in a device that transmits wireless power and a secondary coil provided in a device that receives wireless power to transmit the power.

[0117] Of course, the induction heating method of the induction heating device 1 substantially has the same principle as the technology for transmitting the wireless power using electromagnetic induction in that the object is heated by electromagnetic induction.

[0118] Therefore, according to an embodiment of the present disclosure, the induction heating device 1 may perform a function for transmitting the wireless power, as well as performing a function of induction heating. Further, an induction heating mode or a wireless power transmission mode may be controlled by the controller for the input substrate (or the controller for the input interface 310). Thus, the function for inductively heating the object or the function for transmitting the wireless power may be selectively performed as necessary.

[0119] As described above, the induction heating device 1 according to the embodiment of the present disclosure has the above-described configuration and features. The working coil assembly WCA shown in FIG. 4 is described below in detail.

[0120] FIGS. 10 and 11 show the working coil assembly shown in FIG. 4.

[0121] For reference, the working coil assembly (WCA in FIG. 4) is summarized above. The matter which is not described above is described below.

[0122] As described above, referring to FIGS. 10 and 11, the working coil assembly (WCA in FIG. 3) may include a working coil WC, a ferrite core 126, a first mica sheet 120, a second mica sheet (not shown), an insulating member 150, a packing gasket 149, and a sensor 148.

[0123] Specifically, a core hole 127 is defined at a center of the ferrite core 126 to overlap with an annular inner side of the working coil WC in the height direction HD. A first sheet hole 121 may be defined at a center of the first mica sheet 120 to overlap with the annular inner side of the working coil WC in the height direction HD. A plate hole 146 may be provided in the base plate 145 to overlap with the annular inner side of the working coil WC in the height direction HD.

[0124] Further, as shown in FIG. 10, the core hole 127, the first sheet hole 121, and the plate hole 146 may have the same shape.

[0125] A cross-sectional shape of an outer circumferential surface PGS of the packing gasket 149 fastened to the first sheet hole 121, the core hole 127, and the plate hole 146 may correspond to the shape of the first sheet hole 121.

[0126] Accordingly, the packing gasket 149 may fix the first mica sheet 120 and the ferrite core 126 to the base plate 145.

[0127] For reference, a plurality of plate holes 146 may be provided on the base plate 145 in consideration of the number of working coil assemblies.

[0128] Meanwhile, the ferrite core 126 may include four outer portions, and the insulating member 150 may include four insulating members attached to the four outer portions of the ferrite core 126, respectively.

[0129] Specifically, the ferrite core 126 may include a first outer portion 126a, a second outer portion 126b, a third outer portion 126c, and a fourth outer portion 126d. The second outer portion 126b extends in a direction orthogonal to a long axis direction LD of the first outer portion 126a and the third outer portion 126c extends in a direction orthogonal to a long axis direction LD, of the second outer portion 126b and parallel to the long axis direction LD of the first outer portion 126a, and a fourth outer portion 126d extends in a direction orthogonal to the long axis direction LD of the first outer portion 126a and a long axis direction LD of the third outer portion 126c and parallel to the long axis direction LD' of the second outer portion 126b.

[0130] For reference, the long axis directions LD of the first outer portion 126a and the third outer portion 126c may be the same, and the long axis directions LD' of the second outer portion 126b and the fourth outer portion 126d may be the same. Of course, the long axis direction LD of the first outer portion 126a and the third outer portion 126c and the long axis direction LD' of the second outer portion 126b and fourth outer portion 126d may be perpendicular to each other.

[0131] Further, the insulating member 150 may include a first insulating member 150-1 to a fourth insulating member 150-4 attached to the first outer portion 126a to the fourth outer portion 126d, respectively.

[0132] The first insulating member 150-1 may be attached to the first outer portion 126a to surround an upper surface, a side surface, and a lower surface of the first outer portion 126a. The second insulating member 150-2 may be attached to the second outer portion 126b to surround an upper surface, a side surface, and a lower surface of the second outer portion 126b. Further, the third insulating member 150-3 may be attached to the third outer portion 126c to surround an upper surface, a side surface, and a lower surface of the third outer portion 126c. The fourth insulating member 150-4 may be attached to the fourth outer portion 126c to surround an upper surface, a side surface, and a lower surface of the fourth outer portion 126d.

[0133] The length corresponding to the long axis direction LD of the first insulating member 150-1 may be less than the length corresponding to the long axis direction LD of the first outer portion 126a. The length corresponding to the long axis direction LD' of the second insulating member 150-2 may be less than the length corresponding to the long axis direction LD' of the second outer portion 126b. Further, the length corresponding to the long axis direction LD of the third insulating member 150-3 may be less than the length corresponding to the long axis direction LD of the third outer portion 126c. The length corresponding to the long axis direction LD' of the fourth insulating member 150-4 may be less than the length corresponding to the long axis direction LD' of the fourth outer portion 126d.

[0134] For reference, the length corresponding to the long axis direction of the insulating member 150 may be used only to center portions of the outer portions 126a to 126d as little as possible. However, in one embodiment of the present disclosure, in consideration of assembly tolerance, the insulating member 150 may have a length such that the insulating member 150 may cover a half or more of the outer portions 126a to 126d. The insulating member 150 covers the upper surface, the side surface, and the lower surface of the outer portions 126a to 126d to minimize a possibility that electric shock accidents may occur.

[0135] Of course, when the working coil WC has a rectangular structure rather than a circular structure, an insulating member may be provided to cover not only the outer portions 126a to 126d of the ferrite core 126 but also corners (e.g., FCPs).

[0136] As described above, as the insulating member 150 is attached to the outer portions 126a to 126d of the ferrite core 126 made of a non-insulating material, the creeping distance between the lower surface of the working coil WC and the base plate 145 may meet a standard (e.g., 6.4 mm or more) to prevent electric shock accidents.

[0137] Meanwhile, four corners (e.g., FCPs) of the ferrite core 126 may be bent stepwise, and four corners (e.g., MCPs) of the first mica sheet 120 may also be bent stepwise. The four corners (e.g., FCPs) of the ferrite core 126 may correspond to four corners (e.g., MCPs) of the first mica sheet 120.

[0138] Accordingly, a space for the connection hole 172 provided in the base plate 145 may be provided. Hereinafter, the shapes of the ferrite core 126 and the connection hole 172 are described in detail with reference to FIG. 12.

[0139] FIG. 12 is an enlarged plan view of area 'A' shown in FIG. 4.

[0140] For reference, in FIG. 12, a first mica sheet 120 is omitted for convenience of description. Further, the shape of the ferrite core and the shape of the connection hole described below may be equally applied to other areas other than area 'A', and the shape of the ferrite core and the shape of the connection hole placed in the area 'A' are described.

[0141] Referring to FIG. 12, a total of six working coils may be provided in the area 'A' in FIG. 4, and six ferrite cores may be placed below six working coils, respectively. Further, as described above, corners of the ferrite core may be bent stepwise and the connection hole provided on the base plate may have a shape corresponding to a shape of a corner of the ferrite core.

[0142] Specifically, the working coil may include a first working coil WC1, a second working coil WC2, a third working coil WC3, a fourth working coil WC4, a fifth working coil WC5, and a sixth working coil WC6. The second working coil WC2 may be placed at one side of the first working coil WC1 and the third working coil WC3 may be placed at a rear side of the first working coil WC1 and the fourth working coil WC4 may be placed in an oblique direction of the first working coil WC1, a rear side of the second working coil WC2, and at one side of the third working coil WC3 and the fifth working coil WC5 may be placed at a rear side of the third working coil WC3 and in an oblique direction of the fourth working coil WC4, and the sixth working coil WC6 may be placed in an oblique direction of the third working coil WC3, at a rear side of the fourth working coil WC4 and at one side of the firth working coil WC5.

[0143] Further, the ferrite core may include a first ferrite core 126-1 to a sixth ferrite core 126-6 disposed below the first working coil WC1 to the sixth working coil WC6, respectively.

[0144] The connection hole may include a first connection hole 172-1 and a second connection hole 172-2. The first connection hole 172-1 has a rectangular shape and is provided at an area surrounded by the first ferrite core 126-1 to the fourth ferrite core 126-4, and the second connection hole 172-2 has a rectangular shape in which a portion of corners thereof is bent stepwise and is provided in an area surrounded by the third ferrite core 126-3 to the sixth ferrite core 126-6.

[0145] Accordingly, the corner provided at one side of the rear side of the first ferrite core 126-1 may be bent inward to correspond to the corner provided at the other side of the front side of the first connection hole 172-1 and the corner provided at the other side of the rear side of the second ferrite core 126-2 may be bent inward to correspond to the corner provided at one side of the front side of the first connection hole 172-1. Further, the corner provided at one side of the front side of the third ferrite core 126-3 may be bent inward to correspond to the corner provided at the other side of the rear side of the first connection hole 172-1, and the corner provided at the other side of the front side of the fourth ferrite core 126-4 may be bent inward to correspond to the corner provided at one side of the rear side of the first connection hole 172-1.

[0146] The corner provided at one side of the rear side of the third ferrite core 126-3 may be bent inward to correspond to the corner provided at the other side of the front side of the second connection hole 172-2 and the corner provided at the other side of the rear side of the fourth ferrite core 126-4 may be bent inward to correspond to the corner provided at one side of the front side of the second connection hole 172-2. Further, the corner provided at one side of the front side of the fifth ferrite core 126-5 may be bent inward to correspond to the corner provided at the other side of the rear side of the second connection hole 172-2 and the corner provided at the other side of the front side of the sixth ferrite core 126-6 may be bent inward to correspond to the corner provided at one side of the rear side of the second connection hole 172-2.

[0147] Meanwhile, the connector may include a first connector 171-1 to a fourth connector 171-4 spaced inward apart from an edge of the first connection hole 172-1 and a fifth connector 171-5 and a sixth connector 171-6 spaced inward apart from an edge of the second connection hole 172-2.

[0148] As shown in FIG. 12, the first connector 171-1 may be parallel to the fourth connector 171-4 and the second connector 171-2 may be parallel to the third connector 171-3. The first connector 171-1 and the fourth connector 171-4 may be placed in a direction orthogonal to the second connector 171-2 and the third connector 171-3.

[0149] Specifically, the first connector 171-1 may be provided at one side of the rear side of the first working coil WC and may be coupled to the common terminal WCT1 of the first working coil WC1, and the second connector 171-2 may be provided at the other side of the rear side of the second working coil WC2 and may be coupled to the common terminal WCT2 of the second working coil WC2. Further, the third connector 171-3 may be provided at one side of the front side of the third working coil WC3 and may be coupled to the common terminal WCT3 of the third working coil WC3, and the fourth connector 171-4 may be provided at the other side of the front side of the fourth working coil WC4 and may be coupled to the common terminal WCT4 of the fourth working coil WC4. The fifth connector 171-5 may be provided at one side of the front side of the fifth working coil WC5 and may be coupled to the common terminal WCT5 of the fifth working coil WC5 and the sixth connector 171-6 may be provided at the other side of the front side of the sixth working coil WC6 and may be coupled to the common terminal WCT6 of the sixth working coil WC6.

[0150] As described above, the common terminal of the working coil may be coupled to only one connector. Accordingly, the common terminals WCT1 to WCT4 of the first working coil WC1 to the fourth working coil WC4 are coupled to the first connector 171-1 to the fourth connector 171-4 provided inside of the first connection hole 172-1, respectively, and the common terminals WCT5 and WCT6 of the fifth working coil WC5 and the sixth working coil WC6 are coupled to the fifth connector 171-5 and the sixth connector 171-6 provided inside of the second connection hole 172-2, respectively. The common terminals WCT1 to WCT6 coupled to the first connector 171-1 to the sixth connector 171-6, respectively, may not contact the ferrite cores 126-1 to 126-6, through the above-mentioned coupling method.

[0151] For reference, two connectors (i.e., 171-5 and 171-6) may be provided inside of the second connection hole 172-2 and an available space of the second connection hole 172-2 is greater than an available space of the first connection hole 172-1.

[0152] Therefore, the available space of the second connection hole 172-2 may be used to expand the size of the ferrite core.

[0153] That is, as described above, when the ferrite core has a greater size (i.e., an area), an amount of magnetic flux leaking below the working coil is reduced, so that high output may be obtained with a small amount of current. Further, when a large-sized ferrite core is used, loss of conduction of the inverter and the heating of the working coil may be reduced by reducing the magnitude of the resonance current.

[0154] For this reason, the corner provided at one side of the front side of the second connection hole 172-2 may be bent stepwise (i.e., may be bent inward) and the shape of the corner provided at one side of the front side of the second connection hole 172-2 may be different from the shape of the corner of the connection hole. An area (i.e., a size) of the corner provided at the other side of the rear side of the fourth ferrite core 126-4 may be greater than the area of each of other corners of the ferrite core.

[0155] Further, the high output may be obtained based on a small amount of current by increasing the corner of the fourth ferrite core 126-4 and loss of the conduction of the inverter and the heating of the working coil may be reduced.

[0156] Of course, other corners of the second connection hole 172-2 rather than the corner of the second connection hole 172-2 or the corner of the first connection hole 172-2 may be bent stepwise based on the position of the common terminal of the working coil. In this case, an area of any one of the ferrite cores, other than the fourth ferrite core 126-4 may be increased.

[0157] However, for convenience of description, in one embodiment of the present disclosure, the corner provided at one side of the front side of the second connection hole 172-2 may be bent stepwise and the corner provided at the other side of the rear side of the fourth ferrite core 126-4 may be bent.

[0158] For reference, as shown in FIG. 12, the area of the corner irrelevant to the connection hole, among corners of the ferrite core, may be greater than the area of the corner corresponding to the connection hole, so that the large-sized ferrite core may be provided.

[0159] As described above, according to an embodiment of the present disclosure, the induction heating device 1 may use the high-output working coil, thereby improving performance and reliability of the product.

[0160] Further, according to an embodiment of the present disclosure, the induction heating device 1 may prevent electric shock accidents by preventing contact between the terminal of the ferrite core and the terminal of the working coil, thereby improving user satisfaction.

[0161] While the present disclosure has been described with reference to exemplary drawings thereof, it is to be understood that the present disclosure is not limited to embodiments and drawings in the present disclosure, and various changes can be made by the skilled person in the art within the scope of the technical idea of the present disclosure. Although working effects obtained based on configurations of the present disclosure are not explicitly described while describing the embodiments of the present disclosure, effects predictable based on the configurations have also to be recognized.


Claims

1. An induction heating device (1), comprising:

a working coil (WC) comprising a conducting wire (WCL) wound in an annular shape and comprising an individual terminal and a common terminal (WCT) connected to the conducting wire (WCL), respectively;

a ferrite core (126) provided below the working coil (WC) to diffuse an alternating magnetic field generated by the working coil (WC) upward and having corners (126a-126d) being bent stepwise;

a base plate (145) in which the ferrite core (126) is provided on an upper surface of the base plate (145), the base plate (145) being configured to define a connection hole (172) having a shape corresponding to a corner of the ferrite core (126); and

an indicator substrate (175) installed below the base plate (145) and in which a connector (171) coupled to the common terminal (WCT) is provided on an upper surface of the indicator substrate (175) and protrudes upward through the connection hole (172).


 
2. The induction heating device (1) of claim 1,
wherein the connection hole (172) is provided in an oblique direction of the ferrite core (126) so that the connection hole (172) has a rectangular shape or a rectangular shape in which a portion of a corner of the connection hole (172) is bent stepwise, and
wherein the corner of the ferrite core (126) is bent inward to correspond to the corner of the connection hole (172).
 
3. The induction heating device (1) of claim 1 or 2,
wherein the connector (171) is spaced inward from an edge of the connection hole (172), and
wherein the common terminal (WCT) coupled to the connector (171) does not contact the ferrite core (126).
 
4. The induction heating device (1) of any one of claims 1 to 3,
wherein the working coil (WC) comprises a first working coil (WC1), a second working coil (WC2), a third working coil (WC3), a fourth working coil (WC4), a fifth working coil (WC5), and a sixth working coil (WC6),
wherein the second working coil (WC2) is placed at one side of the first working coil (WC1) and the third working coil (WC3) is placed at a rear side of the first working coil (WC1) and a fourth working coil (WC4) is placed in an oblique direction of the first working coil (WC1), a rear side of the second working coil (WC2), and at one side of the third working coil (WC3) and a fifth working coil (WC5) is placed a rear side of the third working coil (WC3) and in an oblique direction of the fourth working coil (WC4), and a sixth working coil (WC6) is placed in an oblique direction of the third working coil (WC3) and placed at a rear side of the fourth working coil (WC4) and placed at one side of the fifth working coil (WC5),
wherein the ferrite core (126) comprises a first ferrite core (126-1) to a sixth ferrite core (126-6) provided below the first working coil (WC1) to the sixth working coil (WC6), respectively, and
wherein the connection hole (172) comprises a first connection hole (172-1) and a second connection hole (172-2), and the first connection hole (172-1) has a rectangular shape and is provided in an area surrounded by the first ferrite core (126-1) to the fourth ferrite core (126-4) and the second connection hole (172-2) has a rectangular shape in which corners thereof are bent stepwise and is provided in an area surrounded by the third ferrite core (126-3) to the sixth ferrite core (126-6).
 
5. The induction heating device of claim 4,
wherein a corner provided at one side of a rear side of the first ferrite core (126-1) is bent inward so that the corner provided at one side of the rear side of the first ferrite core (126-1) corresponds to a corner provided at the other side of a front portion of the first connection hole (172-1),
wherein a corner provided at the other side of a rear side of the second ferrite core (126-2) is bent inward so that the corner provided at the other side of the rear side of the second ferrite core (126-2) corresponds to a corner provided at one side of a front portion of the first connection hole (172-1),
wherein a corner provided at one side of a front portion of the third ferrite core (126-3) is bent inward so that the corner provided at one side of the front portion of the third ferrite core (126-3) corresponds to a corner provided at the other side of a rear portion of the first connection hole (172-1),
wherein a corner provided at the other side of a front side of the fourth ferrite core (126-4) is bent inward so that the corner provided at the other side of the front side of the fourth ferrite core (126-4) corresponds to a corner provided at one side of a rear portion of the first connection hole (172-1),
wherein the corner provided at one side of a rear side of the third ferrite core (126-3) is bent inward so that the corner provided at one side of the rear side of the third ferrite core (126-3) corresponds to a corner provided at the other side of a front portion of the second connection hole (172-2),
wherein a corner provided at the other side of a rear side of the fourth ferrite core (126-4) is bent inward so that the corner provided at the other side of the rear side of the fourth ferrite core (126-4) corresponds to a corner provided at one side of a front portion of the second connection hole (172-2),
wherein a corner provided at one side of a front side of the fifth ferrite core (126-5) is bent inward so that the corner provided at one side of the front side of the fifth ferrite core (126-5) corresponds to a corner provided at the other side of a rear side of the second connection hole (172-2), and
wherein a corner provided at the other side of a front side of the sixth ferrite core (126-6) is bent inward so that the corner provided at the other side of the front side of the sixth ferrite core (126-6) corresponds to a corner provided at one side of a rear side of the second connection hole (172-2).
 
6. The induction heating device (1) of claim 4 or 5, wherein the connector (171) comprises a first connector (171-1) to a fourth connector (171-4) spaced inward apart from an edge of the first connection hole (172-1), and a fifth connector (171-5) and a sixth connector (171-6) spaced inward apart from an edge of the second connection hole (172-2).
 
7. The induction heating device (1) of claim 6,
wherein the first connector (171-1) is formed at one side of a rear side of the first working coil (WC-1) and is coupled to a common terminal (WCT1) of the first working coil (WC1),
wherein the second connector (171-2) is formed at the other side of a rear side of the second working coil (WC-2) and is coupled to a common terminal (WCT2) of the second working coil (WC2),
wherein the third connector (171-3) is formed at one side of the front side of the third working coil (WC3) and is coupled to a common terminal (WCT3) of the third working coil (WC3),
wherein the fourth connector (171-4) is formed at the other side of the front side of the fourth working coil (WC4) and is coupled to a common terminal (WCT4) of the fourth working coil (WC4),
wherein the fifth connector (171-5) is formed at one side of the front side of the fifth working coil (WC5) and is coupled to a common terminal (WCT5) of the fifth working coil (WC5), and
wherein the sixth connector (171-6) is formed at the other side of the front side of the sixth working coil (WC6) and is coupled to a common terminal (WCT6) of the sixth working coil (WC6).
 
8. The induction heating device (1) of any one of claims 1 to 7, further comprising a first mica sheet (120) provided between the working coil (WC) and the ferrite core (126) to prevent heat generated by the working coil (WC) from being directly transferred to the ferrite core (126),and
wherein preferably a corner of the first mica sheet (120) is bent stepwise so that the corner of the first mica sheet (120) corresponds to a shape of the corner of the ferrite core (126), and/or
wherein preferably the first mica sheet (120) is fixed to the working coil (WC) and the ferrite core (126) through a sealant.
 
9. The induction heating device (1) of any one of claims 1 to 8, wherein a creeping distance between a lower surface of the working coil (WC) and the base plate (145) is 6.4mm or more.
 
10. The induction heating device (1) of claim 8 or 9, further comprising a second mica sheet fixed to an upper end of the working coil (WC) through the sealant.
 
11. The induction heating device (1) of any one of claims 8 to 10,
wherein a core hole (127) is provided at a center of the ferrite core (126) to overlap with an annular inner side of the working coil (WC) in a height direction in which the indicator substrate (175), the base plate (145), the ferrite core (126), the first mica sheet (120), and the working coil (WC) are stacked,
wherein a first sheet hole (121) is provided at a center of the first mica sheet (120) to overlap with the annular inner side of the working coil (WC) in the height direction,
wherein a plate hole (146) is provided on the base plate (145) to overlap with the annular inner side of the working coil (WC) in the height direction, and
wherein the core hole (127), the first sheet hole (121), and the plate hole (146) have the same shape.
 
12. The induction heating device (1) of claim 11, further comprising:

a packing gasket (149) configured to fix the first mica sheet (120) and the ferrite core (126) to the base plate (145); and

a sensor (148) installed at an upper end of the packing gasket (149) and configured to detect a temperature of the packing gasket (149),

wherein a cross-sectional shape of an outer circumferential surface of the packing gasket (149) fastened to the first sheet hole (121), the core hole (127), and the plate hole (146) corresponds to a shape of the first sheet hole (121);.


 
13. The induction heating device of any one of claims 1 to 12, further comprising an insulating member (150) attached to an outer portion of the ferrite core (126) to insulate between the working coil (WC) and the base plate (145), and
wherein preferably the insulating member (150) is configured to cover an upper surface, a side surface, and a lower surface of the outer portion of the ferrite core (126), and/or
wherein preferably a length corresponding to a long axis direction of the insulating member (150) is less than a length corresponding to a long axis direction of the outer portion of the ferrite core (126), and/or
wherein preferably corners of the ferrite core (126) are placed at both ends of the outer portion of the ferrite core (126).
 
14. The induction heating device (1) of any one of claims 1 to 13, comprising:

an indicator substrate support (170) in which the indicator substrate (175) is installed on an upper surface of the indicator substrate support (170);

an inverter substrate (IV_PCB) installed on a lower surface of the indicator substrate support (170), the inverter substrate (IV_PCB) comprising an inverter that applies a resonance current to the working coil (WC) through switching and a first heat sink that radiates heat of the inverter; and

a resonance substrate (R_PCB) installed on the lower surface of the indicator substrate support (170) and comprising a resonance capacitor that resonates through switching of the inverter and a second heat sink that radiates heat of the resonance capacitor.


 
15. The induction heating device (1) of claim 14,
wherein the individual terminal of the working coil (WC) is connected to the resonance capacitor, and
wherein the common terminal (WCT) of the working coil (WC) is connected to the inverter through the connector (171).
 




Drawing















































REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description