KR20210095491A - Induction heating cooker - Google Patents

Abstract

The present invention provides an induction heating cooking device comprising: a working coil for generating a magnetic field when electric current is applied; a working coil base for supporting the working coil below the working coil; an upper plate installed above the working coil to be spaced apart from the upper surface of the working coil; a first temperature sensor for measuring the temperature of a surface at the working coil side of the upper plate; a second temperature sensor installed to be selectively spaced apart both from the surface at the working coil side of the upper plate and from the upper surface of the working coil, and measuring the temperature of air flowing in a separation space between the upper plate and the working coil; an insulation sheet installed on the working coil base selectively between the upper surface of the working coil and the surface at the working coil side of the upper plate, which face each other, to be spaced apart from both surfaces, and having a shape including an evacuation hole which can envelop the whole upper surface of the working coil and where the first temperature sensor can be installed; a control board for controlling the working coil; a fan and a motor for cooling parts on the control board and the working coil; a case constituting an outer appearance; and a manipulation part for manipulating the device.

Description

Induction heating cooking device {INDUCTION HEATING COOKER}

The present invention relates to an induction heating cooking apparatus, and more particularly, to an induction heating cooking apparatus including a configuration for preventing overheating of a working coil that generates a magnetic field when a current is applied.

In general, an induction heating cooking apparatus, also called an induction range, is a cooking apparatus that heats and cooks a cooking container using the principle of induction heating. The induction heating cooking apparatus includes a top plate (or countertop) on which a cooking container is placed, and a working coil that generates a magnetic field when an electric current is applied thereto. When a current is applied to the working coil and a magnetic field is generated, a secondary current is induced in the magnetic material of the cooking vessel and Joule Heat is generated, and the cooking vessel is heated by the Joule heat and the food contained in the cooking vessel is heated. Compared to a gas range or kerosene stove that burns fossil fuels such as gas or oil and heats a cooking vessel with the heat of combustion, this induction heating cooking apparatus enables rapid heating, does not generate harmful gases, and has no risk of fire. There are advantages.

In an induction heating cooking device, it is preferable that only the magnetic body of the cooking vessel heats up and the working coil heats up or is not heated. Since there may be a risk of occurrence, it is necessary to prevent self-heating or heating of the working coil.

Republic of Korea Patent No. 710233 discloses the need for insulation to prevent heat transfer between the upper plate and the working coil, but discloses a configuration in which effective insulation can be made or a concern that the working coil may be damaged as the upper plate is pressed. does not exist.

Korean Patent No. 976447 discloses a blocker that blocks direct heat transfer between the upper plate and the working coil, but there is no consideration of the installation structure applicable to the actual product or the possibility of damage to the working coil by the blocker.

Korean Patent No. 1015763 and Korean Patent No. 1290731 disclose the existence of a heat insulating material attached to the bottom surface of the upper plate.

Korean Patent No. 1772189 discloses that a blocking member for forming a heat insulating layer between the upper plate and the working coil is installed on the working coil using a spacing member to prevent heat generated from the working coil from moving to the upper plate, and the working coil and Although it discloses a configuration in which external air is supplied to the blocking member and heat is discharged to the outside by convection heat transfer, there is no consideration for heat dissipation of the self-heating working coil or the heat transferred from the heated upper plate to the working coil. When the upper plate is pressed, there is a problem that the working coil may be damaged by the gap maintaining member.

On the other hand, Japanese Patent No. 4251192 discloses a configuration in which the winding part of the working coil is divided into two parts, and a temperature sensor is placed in the central part and a spaced part between the two working coil winding parts, respectively, to be in close contact with the back surface of the upper plate to sense the temperature, there is.

In addition, through Korean Patent No. 2026770, the applicant has a main sensor disposed in the center of the working coil base to measure the temperature of the heating target, and the working coil wound around the center of the working coil base and disposed outside the working coil base to measure the temperature of the heating target. An induction range including an eccentric temperature sensor that measures

In addition, in order to prevent overheating of the working coil, the induction heating cooking apparatus according to the related art uses a resonance voltage characteristic according to the magnetic properties of the container used. That is, the characteristic that the resonant voltage when a container with weak magnetism is used is higher than that when a normal magnetic body container is used was used. The induction heating cooking apparatus according to the prior art checks the resonance voltage characteristics of the container used, and in the case of a container with weak magnetism, limits the current applied to the working coil to prevent overheating, thereby limiting the preset maximum output (for example, 1600W) ), heating according to a lower output (eg, 1200 W) was performed. Due to the heating according to such a low output, a problem of poor heating performance (for example, the time for water to reach the boiling point or the time for reaching the oil control temperature becomes longer) occurred.

However, the above conventional techniques are still insufficient to effectively prevent overheating of the working coil, and for this reason, the output of the working coil cannot be used properly.

Korean Patent No. 710233; Korean Patent No. 976447; Korean Patent No. 1015763; Korean Patent No. 1290731; Korean Patent No. 1772189; Japanese Patent No. 4251192; Korean Patent No. 2026770.

An object of the present invention is to solve a problem in that the working coil is damaged or the performance of the working coil is adversely affected because heat is transferred from the cooking vessel to the working coil through the upper plate due to overheating of the cooking vessel.

Another object of the present invention is to provide a configuration capable of effectively dissipating heat to the outside when an excessive current is applied to the working coil and the working coil self-heats, and a configuration capable of determining overheating of the working coil.

Another object of the present invention is to provide an induction heating cooking apparatus capable of preventing overheating of the upper plate and the heating unit while performing heating with a preset maximum output by sensing the temperature of the spaced space between the upper plate and the working coil and the temperature of the upper plate. do it with

The present invention relates to a working coil that generates a magnetic field when a current is applied, a working coil base supporting the working coil under the working coil, an upper plate installed on the upper part of the working coil and spaced apart from the upper surface of the working coil, and the working coil of the upper plate It is installed on the working coil base so as to be spaced apart from both sides between the first temperature sensor for measuring the temperature of the side and the working coil upper surface and the working coil side of the upper plate facing each other, and can cover the entire upper surface of the working coil, Insulation sheet having a shape including an evacuation hole in which the first temperature sensor can be installed, a control board for controlling the working coil, a fan and a motor for cooling the parts on the control board and the working coil, and a case constituting the outer enclosure And, it provides an induction heating cooking apparatus including a control unit for operating the appliance.

In addition, the present invention provides a working coil that generates a magnetic field when a current is applied, a working coil base supporting the working coil under the working coil, and an upper plate installed on the upper part of the working coil to be spaced apart from the upper surface of the working coil, and the upper plate The first temperature sensor for measuring the temperature of the working coil side is installed while being spaced apart from both the working coil side of the upper plate and the upper surface of the working coil, and the temperature of the air flowing in the space between the upper plate and the working coil is measured a second temperature sensor, a control board for controlling the working coil based on at least one of the sensing values of the first temperature sensor and the second temperature sensor, and a fan and a motor for cooling the components and the working coil on the control board; , It provides an induction heating cooking apparatus comprising a case constituting the outer shell, and a manipulation unit for operating the device.

Here, the control board performs a heating operation by controlling the working coil, and it is preferable to control the working coil by determining a normal state, an overheating state, and a degree of overheating of the induction heating cooking apparatus based on the second sensing value.

According to the present invention, it is possible to solve the problem that the working coil is damaged or the performance of the working coil is adversely affected because heat is transferred from the cooking vessel to the working coil through the upper plate due to overheating of the cooking vessel.

Also, according to the present invention, when an excessive current is applied to the working coil and the working coil self-heats, a configuration capable of effectively dissipating the heat to the outside and a configuration capable of determining overheating of the working coil can be provided.

In addition, according to the present invention, by sensing the temperature of the spaced space between the upper plate and the working coil and the temperature of the upper plate, it is possible to provide an induction heating cooking apparatus capable of preventing overheating of the upper plate and the heating unit while performing heating with a preset maximum output. there is.

1 is an exploded perspective view showing an example of an induction heating cooking apparatus to which a configuration according to the present invention can be applied.
Figure 2 shows a cross-sectional view of one side of the induction heating cooking apparatus according to the present invention, together with the configuration of an installation structure for a second temperature sensor that can be applied thereto.
3 is a cross-sectional view of the other side of the induction heating cooking apparatus according to the present invention, together with the configuration of the support member for the insulating sheet that can be applied thereto.
4 is an exploded perspective view showing an example of a main part that can be applied to the induction heating cooking apparatus according to an embodiment of the present invention.
5 is a control configuration diagram of an induction heating cooking apparatus according to an embodiment of the present invention.
6 is a preferred embodiment of a control method by the induction heating cooking apparatus of FIG. 5 .

Although the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. Effects and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various forms.

In the following examples, the singular expression includes the plural expression unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have means that the features or components described in the specification are present, and the possibility that one or more other features or components may be added is not excluded in advance.

In the drawings, the size of the components may be exaggerated or reduced for convenience of description.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

1 is an exploded perspective view showing an example of an induction heating cooking apparatus 1 to which the configuration according to the present invention can be applied, and FIG. 2 is a cross-sectional view of one side of the induction heating cooking apparatus 1 according to the present invention, to be applied thereto Shows the configuration of the installation structure 70 for the second temperature sensor 50 that can 40) together with the configuration of the support member 60, Figure 4 is an exploded perspective view showing an example of a main part that can be applied to the induction heating cooking apparatus 1 according to an embodiment of the present invention.

As shown in the drawings, the induction heating and cooking apparatus 1 according to the first aspect of the present invention supports a working coil 10 that generates a magnetic field when a current is applied, and the working coil 10 under the working coil 10 . The first to measure the temperature of the working coil base 20, the working coil 10, the upper plate 100 installed to be spaced apart from the upper surface of the working coil 10, and the working coil side surface of the upper plate 100 Between the temperature sensor 30 and the upper surface of the working coil 10 facing each other and the working coil side of the upper plate 100, it is installed on the working coil base so as to be spaced apart from both sides, and the entire upper surface of the working coil 10 is A heat insulating material sheet 40 having a shape that can be covered and including an evacuation hole 42 in which the first temperature sensor 30 can be installed, a control board 90 for controlling the working coil 10, and a control board It includes a fan and a motor 92 for cooling the upper parts and the working coil 10 , a case 94 constituting the outer casing, and an operation unit 96 for operating the device.

1 shows an example of a so-called 'three-gu' type induction heating cooking apparatus in which three induction heating cooking apparatuses of different sizes are formed in one package. It may be of the 'i-gu' type, or it may be more than 'seagu'. In the following description, one working coil 10 and the upper plate 100 constituting some of them will be described as an example, but the same logic will be applied to each of the working coils 10 and the upper plate 100 as it is.

A current is applied to the working coil 10 to induce a secondary current in a magnetic material of a cooking vessel (not shown) that can be placed on the top plate 100 , and Joule Heat is generated, and the cooking vessel is heated by Joule heat. It is heated and the food contained in the cooking vessel is heated. Therefore, the container used in the induction heating cooking apparatus must be a special cooking container containing the magnetic material as described above. However, the container used for induction heating may be deformed to overheat the cooking container more than necessary, so that even the working coil 10 positioned under the upper plate 100 may be exposed to high heat. If the cooking vessel used otherwise is capable of induction heating but the characteristics are not suitable, for example, when a vessel with a small diameter compared to the diameter of the working coil or a vessel with weak magnetic properties is used, the induction heating cooking device provides a constant output. There is a case in which the working coil 10 is self-heating by flowing an excessive current to the working coil in order to produce it. In the above case, the working coil may be damaged, the performance may be deteriorated, or there is a risk of fire. For this reason, conventional techniques for measuring the temperature of the upper plate 100 by a temperature sensor or limiting the amount of current applied to the working coil 10 using a resonance voltage have been applied, but the working coil 10 is not actually overheated. There was also a problem in that the output was limited.

In the induction heating cooking apparatus according to the first aspect of the present invention described above, the insulating material sheet 40 is spaced apart from both sides between the upper surface of the working coil 10 and the working coil side of the upper plate 100 facing each other. Since it is installed in the working coil base 20, it is possible to effectively dissipate heat from self-heating of the working coil 10 to the outside. As described above, since the induction heating cooking apparatus according to the present invention includes a fan and a motor 92, the air introduced from the outside flows in a space 80 between the working coil upper surface and the working coil side surface of the upper plate facing each other. While doing so, it is possible to radiate heat generated from the heat of the working coil 10 to the outside. Since the insulation sheet 40 has not only the evacuation hole 42 described above but also an evacuation part such as an evacuation groove 44 for a second temperature sensor to be described later, the upper and lower spaced space 80 of the insulating material sheet 40 is such an evacuation part. configured to communicate with each other through Here, the evacuation hole 42 and the evacuation groove 44 are described separately for the purpose of securing a space for the installation of the first and second temperature sensors 30 and 50, as will be described later. will also be free. In any case, it refers to a region cut out from the insulating material sheet 40 and also functions to communicate with each other the upper and lower spaced spaces 80 around the insulating sheet 40 . The insulation sheet 40 is provided for the purpose of blocking heat transfer from the essentially heated upper plate 100 to the working coil 10 . Previously, the sheet for this purpose was provided on top of the working coil 10, but in this case, there was a problem in blocking the heat caused by the heating of the working coil 10 itself. is provided in the middle of the separation space 80 to easily dissipate heat caused by the heating of the working coil 10 itself through the separation space 80 to the outside, as well as the heat from the heated top plate 100 It has a configuration to prevent transmission to the coil (10).

As shown in the drawing, the working coil 10 includes an opening in the center, and the first temperature sensor 30 is installed to measure the temperature of the working coil side of the upper plate 100 from the center of the working coil 10 . and the heat insulating material sheet 40 has an evacuation hole 42 in the center in which the first temperature sensor 30 can be installed. The first temperature sensor 30 is elastically in close contact with the working coil side of the upper plate 100 using a structure as shown in the drawing to measure the temperature of the upper plate 100 .

More specifically, as shown in FIG. 4 , the insulating material sheet 40 is provided to cover the entire upper surface of the working coil 10 , and a plurality of protrusions 46 formed to protrude outside the outermost rim of the working coil 10 . ), and a through hole 48 is formed in each protrusion 46 , and a part of the support member 60 is fitted in the through hole 48 , so that the insulating material sheet 40 is separated from the upper plate in the space 80 . (100) and the working coil (10) is installed to be spaced apart from both. Since the through hole 48 is formed in the protrusion 46, the insulating material sheet 40 has a shape that can cover the entire upper surface of the working coil 10 as described above, and only through the above-mentioned evacuation part, the insulating material sheet ( 40), the upper and lower spaces can communicate with each other.

In the present invention, the support member 60 shown in FIGS. 3 and 4 is provided in order to effectively install the insulating material sheet 40 to the working coil base 20 , and one side of the support member 60 is the working coil base 20 . ) and the other side of the support member is installed so as to be in elastic contact with the working coil side surface of the upper plate 100, the insulating material sheet 40, the upper surface of the working coil 10 facing each other and the working coil side of the upper plate 100 In the spaced space 80 between the surfaces, it is installed so as to be spaced apart from both sides. In particular, the top plate 100 is pressed downward when a heavy cooking container (the weight of the cooking container mounted on the top plate may exceed 200 Kg in some cases) is raised, and the other side of the support member 60 is the top plate 100 . ), since it is in elastic contact with the working coil side surface, there is no risk of damage to the upper plate 100 by the support member 60 . That is, as shown in FIG. 1, the working coil plate 26 is mounted on a plurality of springs 28 on the case 94 and coupled, even if the upper plate 100 is excessively pressed, the spring 28 and the support member ( 60), the upper plate 100 is supported without being damaged. More preferably, the support member 60 may be made of rubber having elasticity.

The support member 60 has one side fitted into the support member installation hole 22, which is a hole formed in the working coil base 20, and coupled, and the other side is in contact with the working coil 10 side surface of the upper plate 100, and the outer side on the outer surface It is preferable that the separation prevention protrusion 64 protruding to be formed so that the insulating material sheet 40 fitted using the through hole 48 of the insulating material sheet does not easily fall out toward the fitted side. More specifically, as shown in FIG. 3 , the upper plate contact surface 62 in contact with the working coil side surface of the upper plate 100 and the through hole 48 of the insulating material sheet 40 are inserted and seated. Separation prevention protrusion protruding outwardly spaced apart from the sheet seating end 66 and the insulation sheet seating end 66 with a gap equal to or greater than the thickness of the insulation sheet 40 so that the inserted insulation sheet 40 does not easily fall out toward the inserted side (64) and a support rubber including a base mounting portion (68) fitted to the support member installation hole (22) of the working coil base (20). As shown in the drawing, the base seating portion 68 preferably includes a seating protrusion protruding outward so as not to fall out after being inserted into the support member installation hole 22 . Since the support member 60 has this configuration, the support member 60 is installed by inserting the base seating portion 68 of the support member 60 into the support member installation hole 22 of the working coil base 20 . After that, when the support member 60 is inserted through the through hole 48 of the insulation sheet 40, it is seated on the insulation sheet seating end 66 so that the insulation sheet 40 does not come out easily, and the insulation sheet 40 is separated from the space ( 80) not only can be easily installed while being spaced apart to have a desired separation distance from both the top plate 100 and the working coil 10, but also support member even if the top plate 100 is pressed down by a heavy cooking vessel as described above. Since 60 also serves to elastically support the top plate 100 , it is possible to prevent damage to the top plate 100 . As shown in FIG. 4 , a plurality of support members 60 may be installed in the number of two, three, four or more in consideration of the shape of the insulating sheet 40 .

In addition, the induction heating and cooking apparatus 1 according to the second aspect of the present invention includes a working coil 10 that generates a magnetic field when a current is applied, and a working coil supporting the working coil 10 under the working coil 10 . A first temperature sensor ( 30), the working coil side of the upper plate 100 and the working coil 10 are installed while being spaced apart from each other, and the air flowing in the space 80 between the upper plate 100 and the working coil 10 A second temperature sensor 50 for measuring the temperature of, and a control board for controlling the working coil based on at least one sensed value among the sensed values of the first temperature sensor 30 and the second temperature sensor 50 ( 90 , a fan and a motor 92 for cooling the components and the working coil on the control board 90 , a case 94 constituting the exterior, and an operation unit 96 for operating the device.

According to the second feature of the present invention, by measuring the temperature of the air flowing in the separation space 80 between the upper plate 100 and the working coil 10, unlike the prior art, which only measures the temperature of the upper plate 100, the upper plate By comparing with the temperature of (100), it is possible not only to actually measure the heat transferred from the heated upper plate 100 to the working coil 10, but also to actually measure the temperature of the self-heating working coil 10. there is. In addition, by comparing the temperature values measured from each temperature sensor with each other, it is possible to determine overheating of the working coil 10 , and accordingly, it becomes possible to control the amount of current or the resonance frequency applied to the working coil 10 . In particular, cooling air flows inside the induction heating cooking apparatus 1 by the fan and the motor 92 as described above, and the air flowing in the separation space 80 actually informs the temperature of the working coil 10 . Therefore, more immediate feedback control becomes possible. Alternatively, since the first temperature sensor measures the temperature of the upper plate 100 , the overheating of the working coil 10 is transferred from the heated upper plate 100 by comparison of the first temperature sensor value and the second temperature sensor value. It is also possible to check whether it is caused by the self-heating of the working coil 10 .

In addition, the second temperature sensor 50 is installed inside from the outermost edge of the working coil 10, spaced apart from both the working coil side of the upper plate 100 and the upper surface of the working coil 10, the upper plate ( It is preferable to measure the temperature of the air flowing in the space 80 between the 100) and the working coil 10, and for this purpose, the second temperature sensor 50 is fixedly coupled to the working coil base 20 on one side. and the other side is more preferably installed in the installation structure 70 having a shape extending inward from the outside of the outermost edge of the working coil 10 . As shown in more detail in FIG. 2, it is preferable that such an installation structure further includes heat insulating ribs 74 and 75 provided on at least one of the upper plate side and the working coil side of the second temperature sensor 50, It is preferable to further include a lead wire through hole 76 that is a passage through which the lead wire 52 of the second temperature sensor 50 passes. As described above, when the second temperature sensor 50 is positioned inside from the outermost rim of the working coil 10 to measure the temperature of the air flowing in the spaced-apart space 80 in that part, the first temperature sensor ( 30), it is possible to determine the eccentricity of the cooking vessel mounted on the top plate 100 by comparison with the measured value. Here, the eccentricity refers to a case in which the cooking vessel is heated while being placed in a position deviating from the central position of the working coil 10, and it frequently occurs in an induction heating cooking apparatus in which the upper surface of the top plate 100 is flat. When placed in a position, the magnetic field change induced from the working coil is not properly applied to the cooking container, so not only does it not bring sufficient output, but also the problem that a large amount of current flows through the working coil according to the lack of output and the working coil can overheat. will have until In order to find this eccentricity, in the prior art, as shown in the above-mentioned applicant's Korean Patent No. 2026770, the working coil 10 is divided into two winding parts 14 and 16 and wound, and the separation part 18 in the middle is separated. There was a technique for measuring the temperature of the upper plate 100 by placing a temperature sensor of Therefore, it is possible to appropriately find the eccentricity without a temperature sensor for additionally measuring the temperature of the upper plate, such as a temperature sensor located in the spacer 18 as above. That is, there is an advantage in that the second temperature sensor 50 according to the present invention can determine both the overheating of the working coil and the eccentricity of the container by measuring the temperature of the air flowing in the spaced apart space.

In order to position the second temperature sensor 50 at such a position, the installation structure 70 as described above is required, and a specific example thereof is well illustrated in FIG. 2 . That is, the installation structure 70 for installing the second temperature sensor 50 in the spaced space 80 has an approximately "C"-shaped cross-section, and a screw through hole 78 to be described later is formed at the bottom, and at the upper portion The extension bar 72 and upper and lower insulating ribs 74 and 75 are formed, and a lead wire through hole 76 for guiding the lead wire from the second temperature sensor 50 is provided in the height direction of the structure. Due to the presence of the extension bar 72, the upper part is formed asymmetrically longer than the bottom part, so the second temperature sensor 50 measures the temperature of the air flowing in the spaced apart space at the innermost edge of the working coil 10. useful for measuring. One side is fixedly coupled to the working coil base 20 , the screw through hole 78 at the bottom of the installation structure 70 and the installation structure installation hole 23 formed at the installation position of the installation structure 70 of the working coil base 20 ), one side of the installation structure 70 is fixedly coupled by a fixing screw 24, and the other side is formed at the end of the extension bar 72 extending from the outside to the inside of the outermost rim of the working coil 10 A lead wire through hole 76 having an upper insulating rib 74 and a lower insulating rib 75 to be used as a passage through which the lead wire 52 of the second temperature sensor passes through the extension bar 72 and the installation structure. ) is provided. The upper and lower insulating ribs 74 and 75 are the heat of the upper plate 100 heated by heat transfer from the cooking container or the self-heating working coil 10 flows in the space 80 of the second temperature sensor 50 . It is installed to minimize the influence on measuring the air temperature. After all, since the object to be measured by the second temperature sensor 50 is air flowing in the separation space 80, the measured temperature value is distorted by the upper plate 100 and the working coil 10 corresponding to the heat source. Since it is not preferable, the above-described upper and lower insulating ribs 74 and 75 are formed to measure the temperature of the air heated and flowing by the upper plate 100 and the working coil 10, which are heat sources. As shown in FIG. 2 , the second temperature sensor 50 installed between the upper and lower insulating ribs 74 and 75 is opened toward the separation space 80 to measure the temperature of the air flowing in the separation space 80 . be able to In addition, since a high current flows in the working coil 10 , sufficient insulation is required between the second temperature sensor 50 and the working coil 10 , and the lower insulating rib 75 provides the insulation. In particular, since the second temperature sensor 50 inevitably includes a conductor, insulation from the working coil 10 is essential. If the sensor is covered with an insulator considering only insulation, temperature sensing is impossible, so it is preferable to adopt a configuration that secures the insulation distance. For effective induction heating, since the spaced space 80 is narrowly configured, the length of the lower insulating rib 75 is relatively longer than that of the upper insulating rib 74, so that the working coil 10 is formed even in the narrow spaced space 80. ) and the second temperature sensor 50, it is preferable to consider so that a sufficient insulation length can be secured. For this reason, the installation structure 70 is preferably made of an insulating material. The second temperature sensor lead wire 52 is guided through the lead wire through hole 76 provided in the installation structure 70 as described above and is connected to the aforementioned control board 90 .

In addition, in the present invention, it is preferable that the induction heating cooking apparatus having the first characteristic further includes the second characteristic, or the induction heating cooking apparatus having the second characteristic additionally includes the first characteristic.

As described above, the second temperature sensor 50 measures the temperature of the air flowing in the space 80 between the upper plate 100 and the working coil 10 to more effectively reduce the overheating of the working coil 10 . It may be used to determine the eccentricity of the cooking vessel by using the temperature difference between the sensing values of the first temperature sensor 30 and the second temperature sensor 50 .

5 is a control configuration diagram of the induction heating cooking apparatus according to the present invention.

The induction heating and cooking apparatus according to the present invention provides the above-described working coil 10 and the first sensed value T1, which is the temperature of the working coil side surface in the central region of the crater among the working coil 10 and the upper plate 100, to the control board 90. A first temperature sensor 30 to apply, a second temperature sensor 50 for applying a second sensed value T2 that is the temperature of the separation space 80 to the control board 90, and an input (eg, For example, the operation unit 96 that obtains and applies power on/off, selection of a cooking zone, selection of a heating power level, selection of a reservation time, etc.) to the control panel 90, and the state of the induction heating cooking apparatus (eg, For example, a display unit 98 that visually and/or audibly displays a normal state, an overheating state, a degree of overheating, etc.) or operation, and controls the above-described components to perform induction heating with a preset maximum output, Controlling the output of the working coil 10 based on at least one of the first sensing value T1 and the second sensing value T2 to prevent overheating of the upper plate 100 and/or the working coil 10 or It is configured to include a control board 90 to solve. However, the power supply unit (not shown), the operation unit 96, and the display unit 98 are merely techniques recognized by those skilled in the art to which the present invention pertains, and detailed description thereof will be omitted.

Each of the first temperature sensor 30 and the second temperature sensor 50 applies each of the first sensed value T1 and the second sensed value T2 to the control board 90 in real time or periodically.

The control board 90 responds to an input (heating power stage) from the manipulation unit 96 , and a first sensed value T1 and a second sensed value from the first temperature sensor 30 and the second temperature sensor 50 . Induction heating is performed by controlling the working coil 10 based on (T2). For example, the control board 90 stores operation data related to the maximum output (or normal output) and duty corresponding to the thermal power stage, as shown in Table 1 below, and the maximum output corresponding to the input thermal power stage. and duty are read from the stored operation data, and the working coil 10 is controlled correspondingly.

fire power stage One 2 3 4 5 6 7 8 9 Maximum power (W) 1100 1100 1100 1100 1100 1100 1100 1300 1500 Duty (Sec) 1.1/6 1.6/6 2.2/6 2.7/6 3.8/6 4.9/6 6/6 6/6 6/6

In this specification, the maximum output of the control board 90 corresponding to the thermal power stage is referred to as a normal output, and is reduced by a preset ratio (eg, 50%) or size (eg, 500W) of the maximum output. The output is referred to as the reduced output. For example, the normal output of the thermal power stage 9 is 1500W, and the reduced power is 50% of the normal output. In addition, the control board 90 is based on the first sensed value T1 and the second sensed value T2 applied from each of the first temperature sensor 30 and the second temperature sensor 50 or the first applied The working coil 10 may be controlled based on average values for each preset period of the sensing value T1 and the second sensing value T2 .

In addition, the control board 90 is based on the second sensing value T2 from the second temperature sensor 50 overheating of the induction heating cooking apparatus (in particular, the upper plate 100 and/or the working coil 10 ). status can be judged. The control board 90, for example, stores the first overheating reference data of Table 2 below, and compares the second sensed value T2 with the first overheating reference data to determine a normal state, an overheating state, and a degree of overheating, , it is possible to adjust the output of the working coil 10 according to the degree of overheating.

Temperature (temperature range) comparison Temperature state (degree of overheating) T2<RF21 steady state RF21≤T2<RF22 Overheated condition (approx.) RF22≤T2<RF23 Overheat condition (medium) T2>RF23 Overheat condition (strong)

In the first overheating reference data of Table 2, for example, the temperature RF21 may be set to 220°C, the temperature RF22 to 240°C, and the temperature RF23 to 260°C. As shown in Table 2, each of the temperature RF21, the temperature RF22, and the temperature RF23 corresponds to reference temperatures for classifying the normal state, the overheating state, and the overheating degree of the induction heating cooking apparatus. The control board 90 compares the second sensed value T2 and the temperature of at least one of the temperature RF21, the temperature RF22, and the temperature RF23, the normal state of the upper plate 100 and/or the working coil 10, the overheating state and determining the degree of overheating, and controlling the working coil 10 to perform a heating operation or stopping heating corresponding to the reduced output according to the determined degree of overheating, in the following, the control process performed by the control board 90 is It will be described in more detail. 6 is a preferred embodiment of the control method by the induction heating cooking apparatus of FIG. 5 , and the control board 90 performs a heating operation based on the first overheating reference data of Table 2 described above. At this time, power is supplied to the induction heating cooking apparatus by the power supply unit, and each of the first temperature sensor 30 and the second temperature sensor 50 is a first sensing value T1 and a second sensing value T2, respectively. is continuously applied to the control board 90 .

In step S1 , the control board 90 may obtain a selection input for a cooking pot, a selection input for a heating power stage, a reservation time input, etc. through the operation unit 96 , and a standby state for displaying the power supply status and the like through the display unit 98 . carry out The control board 90 does not perform a heating operation in a standby state. Also, the control board 90 performs step S3 while performing step S1.

In step S3 , the control board 90 determines whether a selection input for the thermal power level has been obtained through the operation unit 96 . The thermal power step may include, for example, steps “0” to “9”, where “0” means the end of heating, so the selection input of the thermal power step in step S3 is a “0” step that is the end of heating It means an input of a step other than (eg, any one of steps “1” to “9”). If the control board 90 has obtained the selection input corresponding to the thermal power stage as in Table 1, the control board 90 proceeds to step S5, otherwise performs the standby state of step S1.

In step S5, the control board 90 controls the working coil 10 to perform a heating operation according to the normal output corresponding to the thermal power stage. The control board 90 proceeds to step S7 while performing the heating operation of step S5.

In step S7, the control board 90 compares the first sensed value T1 applied from the first temperature sensor 30 with the reference temperature RF1, and reads and uses the first overheat reference data to determine the overheating state. Decide if you need to Here, the reference temperature RF1 is a low-temperature dish (eg, boiling water, sous vide cooking, etc.) that uses a relatively large amount of water and a high-temperature dish (eg, oil or a pan dish) that uses a relatively large amount of oil. It corresponds to a temperature for determining whether it is a heating process or cooking that requires determination of an overheated state, such as a temperature for distinguishing. In the case of low-temperature cooking, since the boiling point of water is 100 ° C under 1 atm, the temperature of the bottom of the container in contact with the top plate 100 is maintained at around 100 ° C by the water in the container, and the heat conducted from the top plate 100 is also around 100 ° C. am. In addition, in the case of high-temperature cooking, the smoke point of oil will vary depending on the type of oil, but it is approximately 180° C. or higher. In this embodiment, the reference temperature RF1 is set to, for example, 130° C. to distinguish between water and oil loads. can be If the first sensed value T1 is equal to or greater than the reference temperature RF1, the control board 90 reads the first overheating reference data, determines that it is necessary to determine the overheating state such as high temperature cooking, and proceeds to step S9 . If the first sensed value T1 is less than the reference temperature RF1, the control board 90 determines that it is not necessary to determine the overheating state such as low-temperature cooking, and proceeds to step S5 to perform a heating operation according to the normal output do.

In step S9, the control board 90 is the temperature of the induction heating cooking apparatus (in particular, the upper plate 100 and the working coil 10) based on the second sensed value T2 from the second temperature sensor 50. Determines whether the state is a normal state. The control board 90 reads the first overheat reference data in Table 2 and compares the second sensed value T2 with the temperature RF21. If the second sensed value T2 is less than the temperature RF21, the control board 90 determines that the temperature state of the induction heating cooking apparatus is a normal state and proceeds to step S10, otherwise the second sensed value T2 is If the temperature is greater than or equal to RF21, the control board 90 determines that the temperature state of the induction heating cooking apparatus is an overheating state and proceeds to step S11.

In step S10 , the control board 90 controls the working coil 10 to perform a heating operation according to the normal output corresponding to the thermal power stage, as in step S5 . The control board 90 proceeds again to step S7 while performing the heating operation of step S10.

In step S11 , the control board 90 determines whether the temperature state of the induction heating cooking apparatus is overheated (weak) based on the second sensed value T2 from the second temperature sensor 50 . That is, the control board 90 reads the first overheat reference data in Table 2, and determines whether the second sensed value T2 is greater than or equal to the temperature RF21 and less than the temperature RF22. If the second sensing value T2 is greater than or equal to the temperature RF21 and less than the temperature RF22, the control board 90 determines that the temperature state of the induction heating cooking apparatus is an overheating state (about) and proceeds to step S13. If the second sensed value T2 is equal to or greater than the temperature RF22, the control board 90 proceeds to step S15.

In step S13, the control board 90 controls the working coil 10 to reduce the normal output by a predetermined ratio or size to reduce the normal output in order to solve the overheating state (about) of the induction heating cooking apparatus. It performs heating operation according to the output. The control board 90 proceeds again to step S7 while performing step S13.

In step S15 , the control board 90 determines whether the temperature state of the induction heating cooking apparatus is overheated (medium) based on the second sensed value T2 from the second temperature sensor 50 . That is, the control board 90 reads the first overheat reference data in Table 2, and determines whether the second sensed value T2 is greater than or equal to the temperature RF22 and less than the temperature RF23. If the second sensing value T2 is greater than or equal to the temperature RF22 and less than the temperature RF23, the control board 90 determines that the temperature state of the induction heating cooking apparatus is an overheating state (medium) and proceeds to step S17. If the second sensing value T2 is greater than or equal to the temperature RF23, the control board 90 determines that the temperature state of the induction heating cooking apparatus is an overheating state (strong) and proceeds to step S19.

In step S17, the control board 90 controls the working coil 10 to stop the heating operation in order to relieve the overheating state (medium) of the induction heating cooking apparatus. By stopping the heating, the temperature state of the induction heating cooking apparatus can be gradually resolved (medium). The control board 90 proceeds again to step S7 while performing step S17 to determine the temperature state of the induction heating cooking apparatus again.

In step S19, the control board 90 controls the working coil 10 to stop the heating operation in order to resolve the overheating state (strong) of the induction heating cooking apparatus, and in the overheating state (strong), the top plate 100 ) or the working coil 10, since there is concern about damage to the components of the induction heating cooking device and damage to the container, the display unit 98 visually or audible displays that the overheating state is in the overheating state and ends the overheating control process or step S1 Proceed again to perform the standby state. For example, an overheated state (strong) is a state in which there is nothing in the container or the water is mostly evaporated, and no load, or the food is burnt because pan cooking such as rolled eggs or grilled fish has been significantly performed, etc. This may be a case in which the temperature of the upper plate 100 is also rapidly increased.

While performing any one of the steps S5 to S19 described above, the control board 90 obtains a heating end input such as a "0" step input from the operation unit 96, as in a general control operation, or It can be determined by the timer that the reserved time has expired. In this case, the heating of the working coil 10 is stopped or the heating stopped state is maintained and the process proceeds to step S1 to perform the standby state. Alternatively, when a power cut-off input is obtained while performing any one of steps S1 to S19, it is naturally recognized by those skilled in the art that the power is cut off and all operations are terminated. Since it corresponds to the description of the degree, the description thereof is omitted.

In the above-described steps S9, S11 and S15, the reason that the reference temperatures for judging the steady state, the overheating state, and the degree of overheating in the first overheating reference data are higher than the reference temperature RF1 in step S7 is that in the case of high-temperature cooking, yes For example, the oil temperature must be maintained at 180°C or higher to prevent deterioration of cooking quality. That is, the first overheating reference data is configured to include reference temperatures that prevent thermal damage to the working coil 10 and/or the upper plate 100 while maintaining cooking quality during high-temperature cooking.

In the above-described steps S9, S11 and S15, the control board 90 uses the second sensed value T2 from the second temperature sensor 50 to overheat the working coil 10 and/or the upper plate 100. Since the state can be accurately determined, the heating operation by the normal output can be performed until an overheating state occurs. In particular, even if a container with weak magnetism is used and overheating occurs in the working coil 10 and/or the upper plate 100, the control board 90 determines the degree of overheating of the induction heating cooking apparatus, and determines the degree of overheating. Accordingly, by performing steps S13, S17 and S19, the overheating condition is resolved by selectively performing the reduction of the output or the stopping of the heating.

In addition, the control board 90 continuously and/or repeatedly determines the temperature state of the induction heating cooking apparatus even while the output is reduced or the heating is stopped, that is, the degree of overheating of the induction heating cooking apparatus is weakened or returned to a normal state. The change is determined based on each of the first sensed value T1 and the second sensed value T2 to increase the output. For example, after performing the above-described step S13, when the second sensed value T2 corresponds to the normal temperature in step S9 or it is determined that the determination of the overheating state is unnecessary in step S7, the control board ( 90) returns the reduced output back to the normal output in step S10 or S5, and performs a heating operation according to the normal output. In addition, after performing the above-described step S17, if it is determined that the temperature state of the induction heating cooking apparatus is an overheating state (about) in steps S9 and S11, the control board 90 returns to the reduced output of step S13 instead of stopping the heating. Follow the heating operation.

As a modified example of the embodiment shown in FIG. 6 , the control board 90 does not consider the first sensed value T1 from the first temperature sensor 30 and the second sensed value from the second temperature sensor 50 . It is also possible to perform heating control in consideration of only (T2). In FIG. 6 , the control board 90 performs step S9 after performing step S5 without performing step S7, and performs step S9 again following each of steps S10, S13, and S17 to perform the second sensed value Based on (T2), the temperature state of the induction heating cooking apparatus is determined again or repeatedly, and a control corresponding to the determination is performed. In this modified embodiment, the control board 90 determines the same overheating state when performing low-temperature cooking and high-temperature cooking, so that even if there is a difference in the magnetic properties of the container, the heating operation by normal output is performed until the overheating condition occurs. Even if overheating occurs in the working coil 10 and/or the upper plate 100, the degree of overheating of the induction heating cooking apparatus is determined, and the output by performing steps S13, S17 and S19 according to the determined degree of overheating is performed. Decrease or stop heating is optionally performed so that the overheat condition is resolved.

As described above, the present invention is not limited to the specific preferred embodiments described above, and anyone with ordinary skill in the art to which the invention pertains can use various methods without departing from the gist of the present invention as claimed in the claims. It goes without saying that modifications are possible, and such modifications are intended to be within the scope of the claims.

Induction heating cooker: 1 Working coil: 10
Working coil base: 20 First temperature sensor: 30
Insulation sheet: 40 Second temperature sensor: 50
Supporting member: 60 Installation structure: 70
Clearance space: 80 Control panel: 90
Fans & Motors: 92 Cases: 94
Control panel: 96 Display panel: 98
Tops: 100

Claims (25)

A working coil that generates a magnetic field when a current is applied, and
A working coil base supporting the working coil under the working coil, and
an upper plate installed on the upper part of the working coil and spaced apart from the upper surface of the working coil;
A first temperature sensor for measuring the temperature of the working coil side of the upper plate,
Between the upper surface of the working coil facing each other and the working coil side of the upper plate, it is installed on the working coil base so as to be spaced apart from both sides, can cover the entire upper surface of the working coil, and includes an evacuation hole where the first temperature sensor can be installed Insulation sheet having a shape that
A control board for controlling the working coil;
A fan and a motor that cools the parts and the working coil on the control board;
a case constituting the outer
Induction heating cooking apparatus comprising a control unit for operating the appliance. According to claim 1,
The working coil includes an opening in the center,
The first temperature sensor is installed to measure the temperature of the working coil side of the upper plate at the center of the working coil,
Induction heating cooking apparatus, characterized in that the insulation sheet has an evacuation hole in the center in which the first temperature sensor can be installed. According to claim 1,
A supporting member is additionally provided with one side fixed to the working coil base and the other side installed so as to be in elastic contact with the working coil side surface of the upper plate, and the supporting member is provided with an insulating sheet, between the working coil upper surface and the working coil side surface of the upper plate, An induction heating cooking device, characterized in that it is installed to be spaced apart from both sides. 4. The method of claim 3,
The insulation sheet has a plurality of protrusions formed to protrude outside the outermost rim of the working coil,
Induction heating cooking apparatus, characterized in that a through hole is formed in each protrusion, and a heat insulating material sheet is installed by fitting a part of the support member into the through hole. 5. The method of claim 4,
Induction heating cooking apparatus, characterized in that the protrusion protruding outwardly is formed on the support member so that the insulating material sheet inserted using the through hole does not easily fall out to the inserted side. 4. The method of claim 3,
Induction heating cooking apparatus, characterized in that one side of the support member is coupled to a hole formed in the working coil base and the other side is a supporting rubber contacting the working coil side of the upper plate. 7. The method according to any one of claims 1 to 6,
A second temperature sensor that is installed inside from the outermost edge of the working coil, spaced apart from both the working coil side of the upper plate and the upper surface of the working coil, and measures the temperature of the air flowing in the space between the upper plate and the working coil Induction heating cooking apparatus, characterized in that it further comprises. 8. The method of claim 7,
Induction heating cooking apparatus, characterized in that the heat insulating material sheet has an evacuation groove in which the second temperature sensor can be installed on one side. A working coil that generates a magnetic field when a current is applied, and
A working coil base supporting the working coil under the working coil, and
an upper plate installed on the upper part of the working coil and spaced apart from the upper surface of the working coil;
A first temperature sensor for measuring the temperature of the working coil side of the upper plate,
A second temperature sensor that is installed while being spaced apart from both the working coil side surface of the upper plate and the upper surface of the working coil and measures the temperature of air flowing in the space between the upper plate and the working coil;
A control board for controlling the working coil based on at least one of the sensing values of the first temperature sensor and the second temperature sensor;
A fan and a motor that cools the parts and the working coil on the control board;
a case constituting the outer
Induction heating cooking apparatus comprising a control unit for operating the appliance. 10. The method of claim 9,
It is installed so as to be spaced apart from both sides between the upper surface of the working coil facing each other and the surface of the working coil side of the upper plate, can cover the entire upper surface of the working coil, and includes an evacuation unit in which the first temperature sensor and the second temperature sensor can be installed Induction heating cooking apparatus comprising a sheet of insulating material having a shape. 10. The method of claim 9,
The second temperature sensor is installed inside from the outermost edge of the working coil, spaced apart from both the working coil side of the upper plate and the upper surface of the working coil, and measures the temperature of the air flowing in the space between the upper plate and the working coil. Induction heating cooking device, characterized in that the measurement. 12. The method of claim 11,
The second temperature sensor is an induction heating cooking apparatus, characterized in that one side is fixedly coupled to the working coil base and the other side is installed in an installation structure having a shape extending from the outside to the inside of the outermost edge of the working coil. 13. The method of claim 12,
The installation structure further comprises an insulating rib provided on at least one of the upper plate side and the working coil side of the second temperature sensor. 13. The method of claim 12,
The installation structure includes an upper insulating rib provided on the upper plate side and a lower insulating rib provided for the working coil group, and the second temperature sensor is installed between the upper and lower insulating ribs. 13. The method of claim 12,
The installation structure is an induction heating cooking apparatus, characterized in that it further comprises a passage through which the lead wire of the second temperature sensor passes. 10. The method of claim 9,
The control board controls the working coil to perform a heating operation, but determines the normal state, the overheating state and the degree of overheating of the induction heating cooking apparatus based on the second sensing value to control the working coil. Device. 17. The method of claim 16,
The operation unit obtains the thermal power stage input and applies it to the control board,
Induction heating cooking apparatus, characterized in that the control board controls the working coil to perform a heating operation according to a normal output corresponding to the thermal power level applied from the operation unit. 17. The method of claim 16,
The control board stores first overheating reference data including reference temperatures for classifying a normal state, an overheating state, and a degree of overheating, reading the first overheating reference data, and second sensing the reference temperatures of the first overheating reference data Induction heating cooking apparatus, characterized in that the value is compared. 19. The method of claim 18,
The control board controls the working coil to perform a heating operation according to the normal output when the temperature state of the induction heating cooking apparatus is in a normal state based on the second sensed value, and the temperature state of the induction heating cooking apparatus is in an overheated state. In some cases, induction heating and cooking apparatus, characterized in that for controlling the working coil to perform a heating operation according to the reduced output lower than the normal output according to the degree of overheating or to stop the heating. 20. The method of claim 19,
When the control board is in an overheating state, after stopping the heating by controlling the working coil based on the determined degree of overheating, the temperature state of the induction heating cooking apparatus is determined again based on the second sensed value or the control process Induction heating cooking device, characterized in that to end. 20. The method of claim 19,
In the case of an overheating state, the control board controls the working coil based on the determined degree of overheating to perform a heating operation according to the reduced output, while re-determining the temperature state of the induction heating cooking device based on the second sensing value. Induction heating cooking apparatus, characterized in that. 19. The method of claim 18,
The control board compares the first sensed value with the pre-stored reference temperature (RF1),
When the first sensed value is equal to or greater than the reference temperature, reading the first overheating reference data and comparing the reference temperatures of the first overheating reference data with the second sensed value;
When the first sensed value is less than the reference temperature (RF1), the induction heating cooking apparatus, characterized in that the first sensed value and the reference temperature (RF1) are compared again while controlling the working coil to perform a heating operation according to the normal output. 23. The method of claim 22,
The control board compares the reference temperatures of the first overheating reference data with the second sensed value,
When the temperature state of the induction heating cooking apparatus is normal based on the second sensing value, the working coil is controlled to perform a heating operation according to the normal output, and the first sensing value and the reference temperature (RF1) are compared again,
Induction heating cooking apparatus, characterized in that when the temperature state of the induction heating cooking apparatus is an overheating state, controlling the working coil to perform a heating operation according to a reduced output lower than the normal output or to stop heating according to the degree of overheating. 24. The method of claim 23,
In the case of an overheating state, the control board controls the working coil based on the determined degree of overheating to stop heating, then compares the first sensed value with the reference temperature RF1 again, or terminates the control process Induction heating cooking device. 24. The method of claim 23,
In case of an overheating state, the control board controls the working coil based on the determined degree of overheating to perform a heating operation according to the reduced output while comparing the first sensed value with the reference temperature RF1 again. cooking device.

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