WO2024128596A1 - 유도 가열 조리기 - Google Patents
유도 가열 조리기 Download PDFInfo
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- WO2024128596A1 WO2024128596A1 PCT/KR2023/018756 KR2023018756W WO2024128596A1 WO 2024128596 A1 WO2024128596 A1 WO 2024128596A1 KR 2023018756 W KR2023018756 W KR 2023018756W WO 2024128596 A1 WO2024128596 A1 WO 2024128596A1
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- sensor
- coil
- heating coil
- heating
- layer
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
- H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
- H05B6/1272—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements with more than one coil or coil segment per heating zone
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/10—Tops, e.g. hot plates; Rings
- F24C15/102—Tops, e.g. hot plates; Rings electrically heated
- F24C15/106—Tops, e.g. hot plates; Rings electrically heated electric circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/08—Arrangement or mounting of control or safety devices
- F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0258—For cooking
- H05B1/0261—For cooking of food
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
- H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
- H05B6/1236—Cooking devices induction cooking plates or the like and devices to be used in combination with them adapted to induce current in a coil to supply power to a device and electrical heating devices powered in this way
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
- H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
- H05B6/1281—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements with flat coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2207/00—Application of thermometers in household appliances
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/04—Heating plates with overheat protection means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/05—Heating plates with pan detection means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/07—Heating plates with temperature control means
Definitions
- This disclosure relates to an induction heating cooker that induction heats objects to be heated, such as pots.
- a conventional induction heating cooker uses a Litz wire in a coil shape as a heating coil to heat the object placed on a top plate.
- the induction heating cooker is equipped with a sensor coil that detects the position of the object to be heated.
- the heating coil and sensor coil are arranged as different structures. This type of induction heating cooker is disclosed in Japanese Patent Application No. 2016-77445.
- An induction heating cooker includes a top plate and a substrate disposed on the back surface of the top plate.
- a sheet-shaped heating coil for inductively heating the object to be heated is provided on the substrate.
- a sensor coil for detecting the position of the object to be heated is provided on the substrate to be integrated with the heating coil.
- Figure 1 is a schematic diagram showing the overall configuration of an induction heating cooker according to an embodiment of the present disclosure.
- Figure 2 is a schematic diagram of an embodiment of a sensor for position detection.
- Figure 3 is a schematic diagram of an embodiment of a substrate.
- Figure 4 is a schematic diagram of an embodiment of a substrate.
- Figure 5 is a functional block diagram of one embodiment of a control device.
- Figure 6 is a diagram for explaining the arrangement of the sensor coil with respect to the heating coil.
- Figure 7 is a schematic diagram showing an embodiment of the arrangement of a sensor coil with respect to a heating coil.
- Figure 8 is a diagram showing the results of calculating eddy current loss according to the arrangement of the sensor coil.
- Figure 9 is a schematic diagram showing an embodiment of the arrangement of the sensor coil.
- Figure 10 is a schematic diagram for explaining the configuration of a substrate in the case of a conventional heating coil using a Litz wire.
- Figure 11 is a schematic diagram showing the configuration of a substrate when using a heating coil according to an embodiment of the present disclosure.
- Figure 12 is a circuit diagram showing the configuration of a sensor coil, a driving circuit unit, a MUX unit, and a protection circuit unit according to an embodiment of the present disclosure.
- Figure 13 is a diagram schematically showing each operating state of an embodiment of the protection circuit unit.
- Figure 14 is a diagram showing count values when there is no temperature correction and count values when there is temperature correction.
- Figure 15 is a diagram showing count values when magnetic flux absorption is not corrected and count values when magnetic flux absorption is corrected.
- a or B “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C”, and “A Each of phrases such as “at least one of , B, or C” may include any one of the items listed together in the corresponding phrase, or any possible combination thereof.
- One (e.g. first) component is said to be “coupled” or “connected” to another (e.g. second) component, with or without the terms “functionally” or “communicatively”.
- any of the components can be connected to the other components directly (e.g. wired), wirelessly, or through a third component.
- the position of the sensor coil relative to the heating coil may be misaligned, and it may be difficult to detect the minute difference in eddy current flowing in the object to be heated or the detailed position of the object to be heated. there is. Therefore, the accuracy of detecting the position of the object to be heated may deteriorate.
- a member is needed to maintain the litz wire in a coil shape, increasing the number of parts.
- the cost of the parts for the flexible board itself is high, and since the flexible board needs to be constructed separately from the heating coil, a problem may arise in which the reliability of the heating coil itself cannot be guaranteed. .
- the present disclosure provides an induction heating cooker that can improve the accuracy of detecting the position of a heated object by suppressing the positional deviation of the sensor coil with respect to the heating coil.
- the present disclosure provides an induction heating cooker that can reduce the number of parts.
- the present disclosure relates to an induction heating cooker that induction heats an object to be heated, such as a cooking pot, on a top plate.
- the present disclosure relates to an induction heating cooker that can freely place the object to be heated anywhere on the top plate and heat it. It relates to heating cookers.
- Figure 1 is a schematic diagram showing the overall configuration of an induction heating cooker according to an embodiment of the present disclosure.
- the induction heating cooker 100 may include a top plate 1 on which the object to be heated is placed, and a substrate B.
- the substrate (B) includes a heating coil (2) and a sensor coil (3).
- the heating coil 2 is for inductively heating the object to be heated.
- the sensor coil 3 is for detecting the position of the object to be heated.
- the heating coil (2) and sensor coil (3) are integrated. 'Integrated' means that the heating coil 2 and the sensor coil 3 form a structure that can be treated as one assembly unit in the process of manufacturing the induction heating cooker 1.
- the structure including the heating coil 2 and the sensor coil 3 is implemented by the substrate B.
- the inverter circuit (4) supplies alternating current to the heating coil (2).
- the control device 5 controls the inverter circuit 4.
- the top plate 1 may be, for example, a flat plate made of an electrically insulating material such as glass or ceramic.
- the heating coil (2) is installed on the back side of the top plate (1).
- a plurality of heating coils 2 may be arranged to form a two-dimensional array (vertical and horizontal matrix) when viewed from a plan view.
- a pair of heating coils 2 are installed on a common substrate B disposed on the back of the top plate 1, and each pair of heating coils 2 is
- the installed substrate B may be arranged to form a two-dimensional array (vertical and horizontal matrix) when viewed from the top.
- the heating coil 2 may be installed on the substrate B in a sheet shape.
- the heating coil 2 may be formed on the substrate B through a patterning process using photoresist or the like.
- two heating coils 2 are installed on one substrate B.
- the gap between the two heating coils 2 is narrower than half the outer diameter dimension (for example, the maximum or minimum outer diameter) of each heating coil 2.
- Each of the plurality of heating coils 2 may have the same shape and size. It is not necessary for the plurality of heating coils 2 to have the same shape and the same size. For example, at least one of the plurality of heating coils 2 may be different from the others in at least one of shape and size.
- the sensor coil 3 may be installed on the back of the top plate 1.
- the sensor coil 3 may include an inductive proximity coil installed on the substrate B.
- the sensor coil (3) is for detecting the position of the object to be heated placed on the top plate (1).
- Figure 2 is a schematic diagram of an embodiment of the sensor 30 for position detection. Referring to FIG. 2, the sensor coil 3 forms a sensor 30 for position detection together with a resonance condenser 31, an oscillation amplifier 32, an oscillation frequency detection circuit 33, and a control unit 34. do.
- the substrate (B) may be provided with a heating coil layer (B1) including a heating coil (2) and a sensor layer (B2) including a sensor coil (3).
- An insulating layer (B3) is interposed between the heating coil layer (B1) and the sensor layer (B2).
- the substrate (B) is integrated by stacking the heating coil layer (B1), the insulating layer (B3), and the sensor layer (B2).
- the heating coil 2 and the sensor coil 3 can be arranged integrally, and the position of the sensor coil 3 with respect to the heating coil 2 is determined. That is, the relative positional relationship between the heating coil 2 and the sensor coil 3 is common in each of the plurality of substrates B arranged in a row.
- the sensor layer (B2) is located on the top plate (1) side, and the heating coil layer (B1) is stacked so that it is located on the opposite side of the top plate (1) with respect to the sensor layer (B2). It is done.
- a connection connector CN connected to the control board 6 is mounted on the heating coil layer B1.
- the connection connector CN is mounted on the heating coil layer B1 in a direction opposite to the top plate 1.
- the board B is connected to the control board 6 by the connection connector CN. That is, the heating coil 2 is connected to the connection connector CN and can be connected to the control board 6 through the connection connector CN.
- the induction heating cooker 100 may be provided with a temperature sensor T, as shown in FIGS. 1, 3, and 4.
- the temperature sensor T may be installed on the substrate B, or may be installed between adjacent substrates B.
- the temperature sensor T can detect the temperature of the object to be heated and/or the heating coil 2.
- the temperature sensor T is integrated with the heating coil 2 and the sensor coil 3.
- the temperature sensor T may be disposed at or near the center of the heating coil 2, or near the connection connector CN for connecting the heating coil 2 to the control board 6.
- the inverter circuit 4 converts the alternating current voltage supplied from a power source (not shown) into an arbitrary driving frequency and outputs it to the heating coil 2.
- the inverter circuit 4 may be a half-bridge type inverter circuit using a switching element, or it may be a full-bridge type inverter circuit.
- Figure 5 is a functional block diagram of one embodiment of the control device 5. 1 and 5, the control device 5 may include a processor 5a, for example, a central processing unit (CPU), and a memory 5b. The control device 5 may further include input means. The processor 5a reads and executes the program stored in the memory 5b. Thereby, the control device 5 can function as the position detection unit 51 and the inverter control unit 52 as shown in FIG. 5 .
- a processor 5a for example, a central processing unit (CPU), and a memory 5b.
- the control device 5 may further include input means.
- the processor 5a reads and executes the program stored in the memory 5b. Thereby, the control device 5 can function as the position detection unit 51 and the inverter control unit 52 as shown in FIG. 5 .
- the position detection unit 51 may detect the position of the object to be heated based on the output value of the position detection sensor 30.
- the position detection unit 51 can detect the position and size of the object to be heated placed on the top plate 1.
- the position detection sensor 30 may output the inductance value of the sensor coil 3. The inductance value varies depending on whether there is an object to be heated above the sensor coil (3).
- the inductance value output from the position detection sensor 30 varies depending on the distance from the object to be heated to the sensor coil 3. For example, when the object to be heated is moved from a position far from the sensor coil 3 to a position close to it, the inductance value decreases.
- the position detection unit 51 detects the position and size of the object to be heated by comparing the inductance value output from the position detection sensor 30 with a preset threshold value. The position detection unit 51 determines that the object to be heated is located above the sensor coil 3 having an inductance value lower than the threshold value, and outputs the upper part of the sensor coil 3 as the detection position where the object to be heated is located. can do.
- the inverter control unit 52 calculates real power, which is the actual power supplied from a power source not shown, and controls the driving frequency of the inverter circuit 4 so that the calculated real power is close to the target power corresponding to the thermal power set by the user. can do.
- the inverter control unit 52 may control the on/off duty ratio of the switching element of the inverter circuit 4.
- the inverter control unit 52 can control the inverter circuit 4 to selectively supply power to the heating coil 2 located below the object to be heated on the top plate 1 among the plurality of heating coils 2. .
- FIG. 6 is a diagram for explaining the arrangement of the sensor coil 3 with respect to the heating coil 2. Referring to FIG. 6, the arrangement of the sensor coil 3 relative to the heating coil 2 will be described. In Figure 6, the diagonally marked portion indicates the location of the object to be heated.
- FIG. 6(a) a case in which one sensor coil (3) is disposed for one heating coil (2) can be considered.
- FIG. 6(a) four heating coils 2 and four sensor coils 3 respectively corresponding to the four heating coils 2 are shown.
- the number of sensor coils 3 is too small, so it may be difficult to ensure the accuracy of detecting the position of the object to be heated.
- FIG. 6(b) if a plurality of sensor coils 3, for example, 4, are arranged for one heating coil 2, the number of parts increases. The cost of induction cookers may increase. As shown in FIG.
- FIG 7 is a schematic diagram showing an embodiment of the arrangement of the sensor coil 3 with respect to the heating coil 2.
- two sensor coils (3) are disposed for one heating coil (2).
- the two sensor coils 3 are arranged diagonally across the center 2C of the heating coil 2.
- ZX virtual lines
- ZY virtual lines
- the two sensor coils 3 are respectively disposed in two diagonal areas facing each other with respect to the center 2C of the heating coil 2.
- the two sensor coils 3 may be placed in the first quadrant (Q1) and the third quadrant (Q3) or the second quadrant (Q2) and the fourth quadrant (Q4).
- FIG. 8 is a diagram showing the results of calculating eddy current loss according to the arrangement of the sensor coil 3.
- Figure 9 is a schematic diagram showing an example of the arrangement of the sensor coil 3. As shown in FIG. 8(a), the closer the sensor coil 3 is to the corner of the heating coil 2, the greater the eddy current loss. As shown in FIG. 8(c), if the sensor coil 3 is placed in the longitudinal direction with respect to the heating coil 2 (i.e., placed on the virtual line (FIG. 7: ZY)), FIG. 6(c) As explained with reference, it may be difficult to ensure position detection accuracy in the horizontal direction.
- two sensor coils 3 are arranged diagonally with respect to one heating coil 2, and the two sensor coils 3 extend from the corners of the heating coil 2. It can be placed in a location spaced apart from the center.
- the two sensor coils 3 may be disposed between the core portion of the corresponding heating coil 2 and the virtual line (FIG. 7: ZY). According to this arrangement, position detection accuracy can be ensured while suppressing the increase in the number of parts, and eddy current loss can be reduced compared to the arrangement shown in FIG. 8(a).
- the sensor coil 3 may be disposed between the core portion of the corresponding heating coil 2 and the virtual line (FIG. 7: ZX).
- FIG. 10 is a schematic diagram for explaining the configuration of the substrate in the case of a conventional heating coil 2' using a Litz wire.
- Figure 11 is a schematic diagram showing the configuration of a substrate when using the heating coil 2 according to an embodiment of the present disclosure.
- FIG. 10 a configuration in which a conventional heating coil 2' made of a Litz wire in a coil shape is formed in the heating coil layer B1' is shown. Since the output of the inner peripheral part of the heating coil 2' becomes high output, for example, a maximum of about 1000 V, the voltage difference between the heating coil layer B1' and the low-voltage sensor layer B2' increases. As a result, it becomes necessary to interpose a thick insulating layer (B3') between the heating coil layer (B1') and the sensor layer (B2'), which may limit the thickness of the substrate (B)'.
- a thick insulating layer (B3') between the heating coil layer (B1') and the sensor layer (B2'
- the substrate (B) according to an embodiment of the present disclosure, as shown in FIGS. 11 (a) and 11 (b), has two or more heating coil layers (B1) on which the heating coil 2 is installed and insulated from each other. ), a sensor layer (B2) on which the sensor coil (3) is installed, and an insulating layer (B3) interposed between the heating coil layer (B1) and the sensor layer (B2), and a heating coil layer of two or more layers ( In B1), the heating coil layer B1a connected to the resonance condenser (FIG. 2:31) is arranged farther from the sensor layer B2 than the other heating coil layers B1b.
- the plurality of heating coil layers (B1) are stacked so that the directions of the currents flowing through the two adjacent heating coil layers (B1) are opposite to each other.
- the plurality of heating coil layers (B1) are insulated from each other by the plurality of core layers (B4). That is, the core layer (B4) is interposed between two adjacent heating coil layers (B1).
- the heating coil layer B1a on the output side is disposed farther from the sensor layer B2 than the heating coil layer B1b on the input side.
- the heating coil The output of the inner periphery of layer B1 can be suppressed to about 500 V.
- the output of the inner periphery of the heating coil layer (B1) can be suppressed to about 250V. You can.
- an increase in the thickness of the heating coil layer B1, for example, the insulating layer B3 interposed between the input side heating coil B1b and the sensor layer B2, can be suppressed, so that the thickness of the substrate B can be suppressed. You can try to become thinner.
- the high-pressure part of the heating coil 2 is applied to the through hole TH for connecting the heating coil layer B1, the sensor layer B2, and the insulating layer B3, it must be prevented from overlapping with this part.
- the sensor coil 3 of the sensor layer B2 is installed. As a result, an increase in the thickness of the insulating layer B3 can be suppressed, contributing to thinning the substrate B.
- the heating coil 2 and the sensor coil 3 are integrated, the positional deviation of the sensor coil 2 with respect to the heating coil 2 can be suppressed.
- the sheet-shaped heating coil (2) is used, the number of parts can be reduced compared to the conventional heating coil using Litz wire.
- the position detection accuracy of the object to be heated can be high-precision by using a small number of sensor coils 3. possible.
- the gap between the two heating coils (2) installed on one board (B) is narrower than half the outer diameter of the heating coil (2), the influence of the heating coil (2) on the sensor coil (3) is suppressed.
- the heating coil layer (B1a) on the output side connected to the resonance condenser (FIG. 2:31) is disposed farther from the sensor layer (B2) than the heating coil layer (B1b) on the input side.
- the heating coil layer (B1a) close to the sensor layer (B2) can be designed with a low breakdown voltage, and a thin design of the insulating layer (B3) is possible.
- the temperature sensor (T) is integrated with the heating coil (2) and the sensor coil (3), it is possible to reduce product costs by reducing wiring, etc.
- the temperature sensor T is disposed at or near the center of the heating coil 2, or near the connection connector CN to which the heating coil 2 is connected, the temperature is located at a position where the temperature is most likely to become high.
- the sensor T can be disposed, making it possible to detect the temperature of the heating coil 2 or the connecting connector CN itself, making it possible to control the heating coil 2 with high reliability.
- the connection connector (CN) is mounted on the board (B) in the opposite direction to the top plate (1), compared to the structure in which the connection connector (CN) is mounted toward the top plate (1), the object to be heated is Since the distance between the heater and the heating coil 2 is narrowed, the object to be heated can be heated efficiently.
- the form of the induction heating cooker 1 is not limited to the above-described embodiments.
- two heating coils 2 are disposed on one substrate B, but one heating coil 2 may be disposed on one substrate B, and one heating coil 2 may be disposed on one substrate B.
- Three or more heating coils 2 may be disposed on the substrate B.
- two sensor coils 3 are disposed for one heating coil 2, but three or more sensor coils 3 may be disposed for one heating coil 2.
- the sensor coil 3 is disposed to be spaced apart from the corner portion of the heating coil 2 toward the center, but the sensor coil 3 may be disposed at the corner portion of the heating coil 2. According to this arrangement, the accuracy of detecting the heat of the object to be heated in the horizontal and vertical directions can be improved while arranging a small number of sensor coils 3.
- FIG. 12 is a circuit diagram showing the configuration of the sensor coil 3, the driving circuit unit 3D, the MUX unit 36, and the protection circuit unit 35 according to an embodiment of the present disclosure.
- the induction heating cooker 100 may be provided with a protection circuit unit 35.
- the protection circuit portion 35 is disposed between the sensor coil 3 and the drive circuit portion 3D connected to the sensor coil 3.
- the protection circuit unit 35 protects the driving circuit unit 3D from an induced voltage (eg, a maximum of ⁇ 80V) generated in the sensor coil 3.
- the driving circuit unit 3D may include a resonance condenser 31, an oscillation amplifier 32, an oscillation frequency detection circuit 33, and a control unit 34 shown in FIG. 2 .
- a plurality of sensor coils 3 may each be connected to one driving circuit section 3D via a multiplexer (MUX section) 36.
- the protection circuit section 35 is installed between each sensor coil 3 and the MUX section 36 connected to each sensor coil 3. That is, the protection circuit unit 35 is installed to correspond to each of the plurality of sensor coils 3.
- the protection circuit unit 35 may include a protection element 351 including a diode 351a and a field effect transistor 351b.
- the diode 351a may include a Schottky diode.
- the field effect transistor (FET) 351b may include a metal oxide semiconductor field effect transistor (MOSFET).
- Protection elements 351 may be connected in series to each end of the sensor coil 3. In protection element 351, the drain of FET 351b can be connected to sensor coil 3. In protection element 351, diode 351a is connected to the source side of FET 351b.
- the cathode of the diode 351a is connected to the sensor coil 3 side, that is, the source line of the FET 351b, and the anode of the diode 351a is grounded.
- the protection element 351 is configured to automatically turn off the FET (351b) when the source voltage of the FET (351b) becomes 5V or more.
- FIG. 13 is a diagram schematically showing the operating state of one embodiment of the protection circuit unit 35.
- Figure 13(a) shows the case where the protection circuit section 35 is in the off state (FET (351b) is on), and
- Figure 13(b) shows the case where the protection circuit section 35 is in the on state (FET (351b) is off). shows each.
- Figure 13(b) shows a state in which an induced voltage is generated in the sensor coil 3 that is not selected by the MUX unit 36, the source voltage of the FET 351b becomes 5V, and the FET 351b is turned off. do.
- the protection circuit section 35 is in the on state (FET 351b is off)
- FET 351b is off
- an induced voltage is generated in the sensor coil 3.
- the protection circuit unit 35 even if an induced voltage occurs in the sensor coil 3, the MUX unit or the driving circuit unit 3D can be protected from the induced voltage.
- the protection circuit section 35 described above does not consume the induced voltage and protects it with the withstand voltage of the FET 351b, so it can respond even to large induced voltages.
- the output value (count value) of the sensor coil 3 may be corrected using the temperature detected by the temperature sensor T.
- the resistance (Rp) in the resonance circuit can be expressed as equation (1) below.
- L is the inductance of the sensor coil 3
- Rs is the resistance of the sensor coil 3
- C is the capacitance of the resonance condenser 31.
- the driving circuit unit 3D that drives the sensor coil 3 controls the sensor coil 3 with a constant current and outputs the ratio of the frequency due to the change in inductance value as a count value. That is, the count value is proportional to the resistance (Rp) of the resonance circuit.
- the temperature change in the resistance (Rp) of the resonance circuit can be expressed by equation (2) below when the coil material of the sensor coil 3 is constant. ⁇ is the temperature coefficient of resistance.
- the count value decreases linearly with temperature change. Therefore, using the temperature change (T-T0) with respect to the predetermined reference temperature (T0) and the temperature correction coefficient (k) obtained in advance, the count value can be corrected, for example, based on equation (3) below. there is.
- Temperature correction for the count value may be performed in the oscillation frequency detection circuit 33 or the control unit 34 of the position detection sensor 30, or may be performed in the position detection unit 51 of the control device 5.
- Figure 14 is a diagram showing count values when there is no temperature correction and count values when there is temperature correction.
- Figure 14(a) shows the variation in detection values when temperature correction is not performed. In this case, the count value decreases after the start of heating, and even though there is a pot, the count value falls below the threshold for determining “no pot” and a false detection occurs.
- Figure 14(b) shows the variation in detection values when temperature correction is performed. In this case, the decline in the count value is suppressed even after heating is started, and the occurrence of false detections is eliminated.
- the change in the output value (inductance value) of the sensor coil 3 that occurs due to magnetic flux absorption of the heating coil 2 when the heating coil 2 is started is corrected.
- Correction of the effect of magnetic flux absorption on the output value (inductance value) can be performed in the oscillation frequency detection circuit 33 or the control unit 34 of the position detection sensor 30, and the position detection unit 51 of the control device 5 It may also be performed in
- Figure 15 is a diagram showing count values when magnetic flux absorption is not corrected and count values when magnetic flux absorption is corrected.
- Figure 15(a) shows the variation in detection values when magnetic flux absorption is not corrected. In this case, after the start of heating, magnetic flux is absorbed by the heating coil 2 and the count value decreases.
- Figure 15(b) shows the change in detection value when magnetic flux absorption is corrected. In this case, the decrease in the count value due to magnetic flux absorption of the heating coil 2 is corrected.
- An induction heating cooker includes a top plate and a substrate disposed on the back surface of the top plate.
- a sheet-shaped heating coil for inductively heating the object to be heated is provided on the substrate.
- a sensor coil for detecting the position of the object to be heated is provided on the substrate to be integrated with the heating coil.
- At least two sensor coils may be disposed for one heating coil.
- the two sensor coils may be arranged diagonally with the center of the heating coil interposed therebetween. According to this, the accuracy of detecting the position of the object to be heated can be improved while using a small number of sensor coils.
- the sensor coil may be arranged to be spaced apart from a corner of the heating coil toward the center of the heating coil. In one embodiment, the sensor coil may be disposed between a corner of the heating coil and two virtual lines that pass through the center of the heating coil and are orthogonal to each other. According to this, eddy current loss can be reduced.
- At least two heating coils may be disposed on the substrate.
- the spacing between the at least two heating coils may be narrower than half the outer diameter of each heating coil. According to this, heating efficiency can be ensured while suppressing the influence of the heating coil on the sensor coil.
- the substrate includes two or more heating coil layers, each of which has the heating coil and is insulated from each other; A sensor layer including the sensor coil; and an insulating layer interposed between the heating coil layer and the sensor layer.
- the sensor layer may be located closer to the top plate than the heating coil layer.
- the heating coil layer connected to the resonance condenser may be disposed farther from the sensor layer than the other heating coil layers. According to this, the heating coil layer close to the sensor layer can be designed with a low voltage resistance, and a thin design of the insulating layer is possible.
- the induction heating cooker detects the temperature of at least one of the heating coil and the object to be heated, and may include a temperature sensor integrated with the heating coil and the sensor coil. By integrating the temperature sensor with the heating coil and sensor coil, it is possible to reduce product costs by reducing wiring.
- the temperature sensor may be disposed at one of the center of the heating coil, near the center of the heating coil, and near the connection connector to which the heating coil is connected. Since the temperature sensor is placed at a location where the temperature is most likely to be high, it becomes possible to detect the temperature of the heating coil or the connection connector itself, allowing the heating coil to be controlled with high reliability.
- connection connector may be provided on the board to connect the heating coil to the control board.
- the connection connector may be mounted on the board in a direction opposite to the top plate.
- the connection connector may be provided on a heating coil layer of the substrate where the heating coil is provided. According to this, compared to a structure in which the connection connector faces the top plate, the distance between the object to be heated and the heating coil is narrowed, so the object to be heated can be heated efficiently.
- the induction heating cooker includes a driving circuit connected to the sensor coil; It may include a protection circuit unit located between the sensor coil and the driving circuit unit to protect the driving circuit unit from an induced voltage occurring in the sensor coil.
- a driving circuit connected to the sensor coil; It may include a protection circuit unit located between the sensor coil and the driving circuit unit to protect the driving circuit unit from an induced voltage occurring in the sensor coil.
- a plurality of sensor coils may be connected to the driving circuit unit, and the protection circuit unit may be provided for each of the plurality of sensor coils.
- the induction heating cooker may include a temperature sensor (T) that detects the temperature of at least one of the heating coil and the object to be heated.
- T temperature sensor
- the induction heating cooker may correct the output value of the sensor coil using the temperature detected by the temperature sensor.
- the output value of the sensor coil may change depending on the ambient temperature. Specifically, the output value of the sensor coil may change as the resistance value of the sensor coil changes depending on the ambient temperature. For example, as the ambient temperature rises, the output value of the sensor coil may decrease.
- the output value of the sensor coil may drop to the same state as “no pot,” and the heating may be stopped due to false detection of “no pot.”
- the induction heating cooker may correct a change in the output value of the sensor coil that occurs due to magnetic flux absorption of the heating coil when the heating coil starts to operate.
- the sensor coil is unlikely to be affected by the heating coil because a resonance circuit including the heating coil is not formed.
- a resonance circuit including the heating coil is formed, so the magnetic flux generated in the sensor coil near the heating coil is absorbed by the heating coil.
- the accuracy of detecting the position of the object to be heated may decrease.
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- Electromagnetism (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Food Science & Technology (AREA)
- Induction Heating Cooking Devices (AREA)
Abstract
Description
Claims (15)
- 톱플레이트(1);상기 톱플레이트의 이면에 배치된 기판(B);상기 기판에 마련되어 상기 피가열물을 유도 가열하기 위한 시트형의 가열 코일(2);상기 가열 코일과 일체화되도록 상기 기판에 마련되며, 상기 피가열물의 위치를 검출하기 위한 센서 코일(3);을 포함하는 유도 가열 조리기.
- 제1항에 있어서,1개의 상기 가열 코일에 대해 적어도 2개의 상기 센서 코일이 배치되며,2개의 상기 센서 코일은 상기 가열 코일의 중심(2C)을 사이에 두고 대각으로 배치되는 유도 가열 조리기.
- 제2항에 있어서,상기 센서 코일은 상기 가열 코일의 코너부로부터 상기 가열 코일의 중심(2C) 쪽으로 이격되게 배치되는 유도 가열 조리기.
- 제2항 또는 제3항에 있어서,상기 센서 코일은 상기 가열 코일의 코너부와 상기 가열 코일의 중심(2C)을 통과하고 서로 직교하는 두 개의 가상선(ZX, ZY) 사이에 배치되는 유도 가열 조리기.
- 제1항 내지 제4항 중 어느 한 항에 있어서,상기 기판 상에 적어도 2개의 상기 가열 코일이 배치되며,상기 적어도 두 개의 가열 코일의 간격은 각 가열 코일의 외경 치수의 반보다 좁은 유도 가열 조리기.
- 제1항 내지 제5항 중 어느 한 항에 있어서,상기 기판은,각각 상기 가열 코일을 구비하고 서로 절연된 2층 이상의 가열 코일층(B1);상기 센서 코일을 구비하는 센서층(B2); 및상기 가열 코일층과 상기 센서층의 사이에 개재되는 절연층(B3)을 포함하며,상기 센서층(B2)이 상기 가열 코일층(B1)보다 상기 톱플레이트(1)에 가깝게 위치되는 유도 가열 조리기.
- 제6항에 있어서,상기 2층 이상의 가열 코일층 중 공진 콘덴서(31)에 접속되는 가열 코일층(B1a)이, 다른 가열 코일층(Bab)보다 상기 센서층(B2)으로부터 멀리 배치되는 유도 가열 조리기.
- 제1항 내지 제7항 중 어느 한 항에 있어서,상기 가열 코일과 상기 피가열물 중 적어도 하나의 온도를 검지하는 것으로서, 상기 가열 코일 및 상기 센서 코일과 일체화된 온도 센서(T);를 더 구비하는 유도 가열 조리기.
- 제8항에 있어서,상기 온도 센서는 상기 가열 코일의 중심, 상기 가열 코일의 중심의 근방, 및 상기 가열 코일이 접속되는 접속 커넥터(CN)의 근방 중 하나에 배치되는 유도 가열 조리기.
- 제1항 내지 제9항 중 어느 한 항에 있어서,상기 기판 상에 상기 가열 코일을 제어 기판에 접속시키기 위한 접속 커넥터(CN)가 마련되며,상기 접속 커넥터는 상기 톱플레이트에 대해 역방향으로 상기 기판에 실장되는 유도 가열 조리기.
- 제10항에 있어서,상기 접속 커넥터는 상기 기판의 상기 가열 코일이 마련된 가열 코일층(B1)에 마련된 유도 가열 조리기.
- 제1항 내지 제11항 중 어느 한 항에 있어서,상기 센서 코일에 접속되는 구동 회로부(3D);상기 센서 코일과 상기 구동 회로부 사이에 위치되어 상기 센서 코일에 발생하는 유기 전압으로부터 상기 구동 회로부를 보호하는 보호 회로부(35);를 포함하는 유도 가열 조리기.
- 제12 항에 있어서,상기 구동 회로부에 접속되는 복수의 상기 센서 코일;을 포함하며,상기 보호 회로부는 상기 복수의 센서 코일 각각에 대하여 마련되는 유도 가열 조리기.
- 제1항 내지 제13항 중 어느 한 항에 있어서,상기 가열 코일과 상기 피가열물 중 적어도 하나의 온도를 검지하는 온도 센서(T);를 포함하며,상기 온도 센서에 의해 검출된 온도를 이용하여 상기 센서 코일의 출력값을 보정하는 유도 가열 조리기.
- 제1항 내지 제14항 중 어느 한 항에 있어서,상기 가열 코일의 구동 개시 시에 상기 가열 코일의 자속 흡수로 인하여 발생하는 상기 센서 코일의 출력값의 변화를 보정하는 유도 가열 조리기.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23903799.7A EP4615162A4 (en) | 2022-12-16 | 2023-11-21 | Induction heating cooker |
| KR1020257011699A KR20250072994A (ko) | 2022-12-16 | 2023-11-21 | 유도 가열 조리기 |
| CN202380083944.7A CN120435915A (zh) | 2022-12-16 | 2023-11-21 | 感应加热炊具 |
| US19/217,841 US20250287474A1 (en) | 2022-12-16 | 2025-05-23 | Induction heating cooker |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022201363 | 2022-12-16 | ||
| JP2022-201363 | 2022-12-16 | ||
| JP2023183791A JP2024086581A (ja) | 2022-12-16 | 2023-10-26 | 誘導加熱調理器 |
| JP2023-183791 | 2023-10-26 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US19/217,841 Continuation US20250287474A1 (en) | 2022-12-16 | 2025-05-23 | Induction heating cooker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024128596A1 true WO2024128596A1 (ko) | 2024-06-20 |
Family
ID=91485141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2023/018756 Ceased WO2024128596A1 (ko) | 2022-12-16 | 2023-11-21 | 유도 가열 조리기 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20250287474A1 (ko) |
| EP (1) | EP4615162A4 (ko) |
| KR (1) | KR20250072994A (ko) |
| CN (1) | CN120435915A (ko) |
| WO (1) | WO2024128596A1 (ko) |
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| JP2018032503A (ja) * | 2016-08-24 | 2018-03-01 | 三菱電機株式会社 | 温度検知装置および加熱調理器 |
| KR20180091542A (ko) * | 2017-02-07 | 2018-08-16 | 엘지전자 주식회사 | 유도 가열 조리기기 |
| KR20190038171A (ko) * | 2017-09-29 | 2019-04-08 | 엘지전자 주식회사 | 인디케이터 및 이를 포함하는 유도 가열 장치 |
| KR20210064156A (ko) * | 2020-01-13 | 2021-06-02 | 엘지전자 주식회사 | 용기 감지 센서 및 용기 감지 센서를 포함하는 유도 가열 장치 |
| KR20220141433A (ko) * | 2021-04-13 | 2022-10-20 | 에스케이매직 주식회사 | 유도가열 조리장치 |
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| JP5106201B2 (ja) * | 2008-03-27 | 2012-12-26 | 三菱電機株式会社 | 誘導加熱調理器 |
| ES2376566B1 (es) * | 2009-10-13 | 2013-01-29 | Bsh Electrodomésticos España, S.A. | Campo de cocción con sensores inductivos. |
| DE102014111899A1 (de) * | 2014-08-20 | 2016-02-25 | Miele & Cie. Kg | Kochfeldeinrichtung und Verfahren zum Betreiben |
| DE102017221341A1 (de) * | 2017-11-28 | 2019-05-29 | E.G.O. Elektro-Gerätebau GmbH | Topferkennungssensor für ein Induktionskochfeld und Induktionskochfeld |
| IT201900013785A1 (it) * | 2019-08-02 | 2021-02-02 | Irca Spa | Riscaldatore a induzione per un piano di cottura |
| US12598676B2 (en) * | 2021-12-23 | 2026-04-07 | Whirlpool Corporation | Cooking article detection system with differential detection coils |
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2023
- 2023-11-21 WO PCT/KR2023/018756 patent/WO2024128596A1/ko not_active Ceased
- 2023-11-21 CN CN202380083944.7A patent/CN120435915A/zh active Pending
- 2023-11-21 KR KR1020257011699A patent/KR20250072994A/ko active Pending
- 2023-11-21 EP EP23903799.7A patent/EP4615162A4/en active Pending
-
2025
- 2025-05-23 US US19/217,841 patent/US20250287474A1/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016077445A (ja) | 2014-10-15 | 2016-05-16 | 国立大学法人秋田大学 | 骨生検用工具及び骨組織採取方法 |
| JP2018032503A (ja) * | 2016-08-24 | 2018-03-01 | 三菱電機株式会社 | 温度検知装置および加熱調理器 |
| KR20180091542A (ko) * | 2017-02-07 | 2018-08-16 | 엘지전자 주식회사 | 유도 가열 조리기기 |
| KR20190038171A (ko) * | 2017-09-29 | 2019-04-08 | 엘지전자 주식회사 | 인디케이터 및 이를 포함하는 유도 가열 장치 |
| KR20210064156A (ko) * | 2020-01-13 | 2021-06-02 | 엘지전자 주식회사 | 용기 감지 센서 및 용기 감지 센서를 포함하는 유도 가열 장치 |
| KR20220141433A (ko) * | 2021-04-13 | 2022-10-20 | 에스케이매직 주식회사 | 유도가열 조리장치 |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20250287474A1 (en) | 2025-09-11 |
| EP4615162A1 (en) | 2025-09-10 |
| KR20250072994A (ko) | 2025-05-26 |
| EP4615162A4 (en) | 2026-03-04 |
| CN120435915A (zh) | 2025-08-05 |
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