Control method of electromagnetic heating cooking utensil and electromagnetic heating cooking utensil

Abstract

The invention discloses a control method of an electromagnetic heating cooking utensil and the electromagnetic heating cooking utensil. The electromagnetic heating cooking utensil comprises a pot body, an inner pot, a bottom coil and a plurality of side coils. The inner pot is arranged in the cooker body and used for containing food materials; the bottom coil is arranged at the bottom of the cooker body; the multiple side coils are arranged on the side of the cooker body and are arranged at intervals in the height direction of the cooker body. The control method comprises the steps that in the cooking heating process, the bottom coil and the at least one side coil are connected in series according to the amount of food materials, so that a resonant inductor of the electromagnetic heating resonant circuit is formed. According to the application, the electromagnetic heating cooking utensil can realize three-dimensional heating, so that food materials are uniformly heated up and down, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of cooking appliances, and in particular to a control method for an electromagnetic heating cooking appliance and an electromagnetic heating cooking appliance using the method. Background Art

[0002] The electromagnetic heating rice cookers currently on the market only have coils wound at the bottom, with no coils wound elsewhere. The windings are concentrated at the bottom, and the power is unevenly distributed. Heating the bottom at full power will cause the rice at the bottom of the pot to be hard and brown. Frequent intermittent heating will cause a large temperature difference between the upper, middle and lower parts of the inner pot wall, and the rice in the middle and upper parts will not boil fully, making the rice in the middle and upper parts of the pot wall very wet. This phenomenon is particularly obvious when cooking a large amount of rice in a 5L rice cooker, which brings a bad experience to consumers.

[0003] Therefore, an electromagnetic heating cooking appliance is needed to at least partially solve the above problems. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In order to at least partially solve the above problems, the first aspect of the present application provides a control method for an electromagnetic heating cooking appliance, wherein the electromagnetic heating cooking appliance comprises:

[0006] pot body;

[0007] An inner pot, arranged in the pot body, for containing food;

[0008] A bottom coil, disposed at the bottom of the pot body; and

[0009] A plurality of side coils are arranged on the side of the pot body, and the plurality of side coils are arranged at intervals along the height direction of the pot body.

[0010] The control method comprises:

[0011] During the cooking and heating process, the bottom coil is connected in series with at least one of the side coils according to the amount of food, so as to form a resonant inductance of the electromagnetic heating resonant circuit.

[0012] According to the present application, the electromagnetic heating cooking appliance can select different side coils according to the amount of food, thereby achieving three-dimensional heating, so that the food is heated evenly from top to bottom, improving the user experience.

[0013] Optionally,

[0014] When the amount of the food is small, the position of at least one of the side coils connected in series with the bottom coil is lower than the position of at least one of the side coils connected in series with the bottom coil when the amount of the food is large.

[0015] The position of the highest one of the side coils connected in series with the bottom coil when the amount of the food is small is not higher than the position of the highest one of the side coils connected in series with the bottom coil when the amount of the food is large.

[0016] According to the present application, the cooking appliance selects side coils with different distribution heights according to the amount of food. The more food there is, the higher the position of the side coil is, so that the heating of the cooking space is more precise.

[0017] Optionally,

[0018] The electromagnetic heating cooking appliance includes three side coils, a first side coil, a second side coil and a third side coil, and the first side coil, the second side coil and the third side coil are arranged in order from low to high along the height direction of the pot body.

[0019] According to the present application, three coils may be arranged from high to low on the side of the cooking appliance.

[0020] Optionally,

[0021] During the cooking heating process, the bottom coil is kept in series with one of the first side coil, the second side coil and the third side coil, wherein the inductance of any one of the first side coil, the second side coil and the third side coil is less than or equal to 20% of the inductance of the bottom coil; or

[0022] During the cooking heating process, the bottom coil is maintained in series with two of the first side coil, the second side coil and the third side coil, wherein the sum of the inductances of any two of the first side coil, the second side coil and the third side coil is less than or equal to 20% of the inductance of the bottom coil.

[0023] According to the present application, the sum of the inductances of the side coils connected in series with the bottom coil is less than or equal to 20% of the inductance of the bottom coil, so that the inductance value of the resonant inductor is relatively stable, which is beneficial to maintaining stable electromagnetic compatibility performance of the cooking appliance.

[0024] Optionally, the first side coil, the second side coil and the third side coil are configured as the same coil or have the same inductance; or

[0025] The inductance of the first side coil is smaller than the inductance of the second side coil, and the inductance of the second side coil is smaller than the inductance of the third side coil.

[0026] According to the present application, when the inductance of the side coils is the same, the resonant inductance remains unchanged, which is conducive to the stability of electromagnetic compatibility performance. Alternatively, when the inductance increases, the heating power increases. According to the present application, the higher the position of the side coil, the greater the amount of food corresponding to it, so appropriately increasing the heating power is conducive to improving cooking efficiency. The higher the position of the side coil, the greater the inductance value, which can make the three-dimensional heating firepower distribution more reasonable and the heating more uniform.

[0027] Optionally,

[0028] The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount.

[0029] When the amount of the food is the small amount, during the cooking and heating process, the bottom coil and the first side coil are kept in series connection to form the resonant inductor.

[0030] When the amount of the food is the medium amount, during the cooking and heating process, the bottom coil and the second side coil are kept in series connection to form the resonant inductor.

[0031] When the amount of the food is the large amount, during the cooking and heating process, the bottom coil and the third side coil are kept connected in series to form the resonant inductance.

[0032] According to the present application, corresponding to different amounts of food, one side coil is selected to be connected each time.

[0033] Optionally,

[0034] The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount.

[0035] When the amount of the food is the small amount, during the cooking and heating process, the bottom coil, the first side coil and the second side coil are kept connected in series to form the resonant inductor.

[0036] When the amount of the food is the medium amount, during the cooking and heating process, the bottom coil, the first side coil and the third side coil are kept connected in series to form the resonant inductor.

[0037] When the amount of the food is the large amount, during the cooking heating process, the bottom coil, the second side coil and the third side coil are kept connected in series to form the resonant inductance.

[0038] According to the present application, corresponding to different amounts of food, two side coils are selected to be connected each time.

[0039] Optionally, a ratio of an absolute value of a difference between a maximum value and an average value of the inductance value of the resonant inductor to an average value of the inductance value of the resonant inductor is less than or equal to 20%, and a ratio of an absolute value of a difference between a minimum value and an average value of the inductance value of the resonant inductor to an average value of the inductance value of the resonant inductor is less than or equal to 20%; or

[0040] The sum of the inductance values ​​of the side coils connected in series with the bottom coil in the resonant inductor is less than or equal to 20% of the inductance value of the bottom coil.

[0041] According to the present application, the inductance value of the resonant inductor is relatively stable, which is beneficial to maintaining stable electromagnetic compatibility performance of the cooking appliance.

[0042] Optionally, the control method further includes determining the amount of the food during the cooking and heating process, including:

[0043] During the cooking and heating process, the amount of the food is determined based on the heating time taken for the cooking and heating temperature to reach a preset temperature, wherein the longer the heating time is, the greater the amount of the food.

[0044] Further, the preset temperature is 60 to 80° C.; and / or

[0045] The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount.

[0046] When the heating time is less than 5 minutes, it is determined that the amount of the food is small.

[0047] When the heating time is greater than or equal to 5 minutes and less than 8 minutes, the amount of the food is determined to be medium.

[0048] When the heating time is greater than or equal to 8 minutes, it is determined that the amount of the food is large.

[0049] According to the present application, the cooking appliance automatically determines the amount of food according to the time taken for the food to heat up, and the cooking appliance is highly intelligent.

[0050] A second aspect of the present application provides an electromagnetic heating cooking appliance, comprising:

[0051] pot body;

[0052] An inner pot, arranged in the pot body, for containing food;

[0053] A bottom coil is arranged at the bottom of the pot body;

[0054] A plurality of side coils are arranged at the side of the pot body and are used to be connected to the bottom coil. The plurality of side coils are arranged at intervals along the height direction of the pot body.

[0055] A resonant capacitor is disposed in the pot body, one end of the resonant capacitor is connected to the bottom coil, and the other end of the resonant capacitor is used to connect at least one of the side coils to form an electromagnetic heating resonant circuit with the bottom coil and the at least one side coil;

[0056] a plurality of first switch elements, each of which is connected to at least one of the side coils, and different first switches are connected to different side coils; and

[0057] A control device is electrically connected to the plurality of first switch elements to control the on and off of the plurality of first switch elements. During the cooking and heating process, the control device is configured to control one of the plurality of first switch elements to remain on according to the amount of the food, so that the bottom coil and at least one of the side coils remain connected in series to form a resonant inductance of the electromagnetic heating resonant circuit.

[0058] According to the present application, the electromagnetic heating cooking appliance can select different side coils according to the amount of food, thereby achieving three-dimensional heating, so that the food is heated evenly from top to bottom, improving the user experience.

[0059] Optionally, the cooking appliance is configured as:

[0060] When the amount of the food is small, the position of at least one of the side coils connected in series with the bottom coil is lower than the position of at least one of the side coils connected in series with the bottom coil when the amount of the food is large.

[0061] The position of the highest one of the side coils connected in series with the bottom coil when the amount of the food is small is not higher than the position of the highest one of the side coils connected in series with the bottom coil when the amount of the food is large.

[0062] According to the present application, the cooking appliance selects side coils with different distribution heights according to the amount of food. The larger the amount of food, the higher the position of the side coil, so that the heating of the cooking space is more precise.

[0063] Optionally, the electromagnetic heating cooking appliance includes three side coils, a first side coil, a second side coil and a third side coil, and the first side coil, the second side coil and the third side coil are arranged in sequence from low to high along the height direction of the pot body.

[0064] According to the present application, the cooking appliance is provided with three side coils from high to low on the side.

[0065] Optionally, the control device is configured as:

[0066] During the cooking heating process, controlling one of the plurality of first switching elements to remain turned on, so that the bottom coil is connected in series with one of the first side coil, the second side coil, and the third side coil to form the resonant inductor, wherein the inductance of any one of the first side coil, the second side coil, and the third side coil is less than or equal to 20% of the inductance of the bottom coil; or

[0067] During the cooking heating process, one of the multiple first switching elements is controlled to remain turned on, so that the bottom coil is connected in series with two of the first side coil, the second side coil and the third side coil to form the resonant inductance, wherein the sum of the inductances of any two of the first side coil, the second side coil and the third side coil is less than or equal to 20% of the inductance of the bottom coil.

[0068] According to the present application, the sum of the inductances of the side coils connected in series with the bottom coil is less than or equal to 20% of the inductance of the bottom coil, so that the inductance value of the resonant inductor is relatively stable, which is beneficial to maintaining stable electromagnetic compatibility performance of the cooking appliance.

[0069] Optionally, the first side coil, the second side coil and the third side coil are configured as the same coil or have the same inductance; or

[0070] The inductance of the first side coil is smaller than the inductance of the second side coil, and the inductance of the second side coil is smaller than the inductance of the third side coil.

[0071] According to the present application, the inductance of the side coils is the same, so that the resonant inductance remains unchanged, which is beneficial to the stability of the electromagnetic compatibility performance of the cooking appliance. Alternatively, when the inductance increases, the heating power increases. According to the present application, the higher the position of the side coil, the greater the amount of food corresponding to it, so appropriately increasing the heating power is beneficial to improving cooking efficiency. The higher the position of the side coil, the greater the inductance value, which can make the three-dimensional heating firepower distribution more reasonable and the heating more uniform.

[0072] Optionally, the electromagnetic heating cooking appliance comprises three first switch elements, each of which corresponds to one of the side coils connected in series, and the first switch elements connected in series with the side coils form a branch, and the branch is connected between the bottom coil and the resonant capacitor;

[0073] The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount, and the control device is configured as follows:

[0074] When the amount of the food is the small amount, during the cooking and heating process, the first switch element connected in series with the first side coil is controlled to remain turned on, so that the bottom coil and the first side coil remain connected in series to form the resonant inductor.

[0075] When the amount of the food is the medium amount, during the cooking and heating process, the first switch element connected in series with the second side coil is controlled to remain turned on, so that the bottom coil and the second side coil remain connected in series to form the resonant inductor.

[0076] When the amount of the food is the large amount, during the cooking and heating process, the first switch element connected in series with the third side coil is controlled to remain turned on, so that the bottom coil and the third side coil remain connected in series to form the resonant inductor.

[0077] According to the present application, corresponding to different amounts of food, one side coil is selected to be connected each time.

[0078] Optionally, the electromagnetic heating cooking appliance comprises a three-way relay, and the three-way relay provides the three first switching elements.

[0079] According to the present application, the first switch element is simple to control, has stable performance, low cost, and is easy to obtain.

[0080] Optionally, the electromagnetic heating cooking appliance further comprises a plurality of second switch elements, each of which is used to be connected to at least one of the side coils, wherein the control device is electrically connected to the plurality of second switch elements to control the on and off of the plurality of second switch elements.

[0081] During the cooking heating process, the control device is configured to control one of the plurality of first switching elements and at most two of the plurality of second switching elements to remain turned on, so that the bottom coil and the two side coils remain connected in series to form the resonant inductance.

[0082] According to the present application, more than one side coil can be switched in during heating by arranging a switching element between the side coils.

[0083] Optionally,

[0084] The electromagnetic heating cooking appliance comprises:

[0085] two first switching elements, one of which is connected in series with the first side coil, and the other of which is connected in series with the second side coil, and

[0086] three second switching elements, one of which is connected between the first side coil and the second side coil, one is connected between the first side coil and the third side coil, and one is connected between one end of the third side coil for connecting to the second side coil and the other end of the resonant capacitor;

[0087] The other end of the resonant capacitor is also connected to the third side coil;

[0088] The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount, and the control device is configured as follows:

[0089] When the amount of the food is the small amount, during the cooking and heating process, the first switch element connected in series with the first side coil, the second switch element connected between the first side coil and the second side coil, and the second switch element connected between one end of the third side coil for connecting with the second side coil and the other end of the resonant capacitor are controlled to remain turned on, so that the bottom coil, the first side coil, and the second side coil remain connected in series to form the resonant inductor.

[0090] When the amount of the food is the medium amount, during the cooking and heating process, the first switch element connected in series with the first side coil and the second switch element connected between the first side coil and the third side coil are controlled to remain turned on, so that the bottom coil, the first side coil and the third side coil remain connected in series to form the resonant inductor.

[0091] When the amount of the food is the large amount, during the cooking and heating process, the first switching element connected in series with the second side coil is controlled to remain turned on, so that the bottom coil, the second side coil and the third side coil remain connected in series to form the resonant inductor.

[0092] Or alternatively,

[0093] The electromagnetic heating cooking appliance comprises:

[0094] two first switching elements, one of which is connected in series with the first side coil, and the other of which is connected in series with the third side coil, and

[0095] three second switching elements, one of which is connected between the first side coil and the second side coil, one is connected between the first side coil and the third side coil, and one is connected between one end of the second side coil for connecting to the third side coil and the other end of the resonant capacitor;

[0096] The other end of the resonant capacitor is also connected to the second side coil;

[0097] The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount, and the control device is configured as follows:

[0098] When the amount of the food is the small amount, during the cooking and heating process, the first switch element connected in series with the first side coil and the second switch element connected between the first side coil and the second side coil are controlled to remain turned on, so that the bottom coil, the first side coil and the second side coil remain connected in series to form the resonant inductor.

[0099] When the amount of the food is the medium amount, during the cooking and heating process, the first switch element connected in series with the first side coil, the second switch element connected between the first side coil and the third side coil, and the second switch element connected between the end of the second side coil for connection with the third side coil and the other end of the resonant capacitor are controlled to remain turned on, so that the bottom coil, the first side coil, and the third side coil remain connected in series to form the resonant inductor.

[0100] When the amount of the food is the large amount, during the cooking and heating process, the first switching element connected in series with the third side coil is controlled to remain turned on, so that the bottom coil, the second side coil and the third side coil remain connected in series to form the resonant inductor.

[0101] According to the present application, corresponding to different amounts of food, two side coils are selected to be connected each time.

[0102] Optionally, the first switching element and / or the second switching element is configured as a relay.

[0103] According to the present application, the first switch element and / or the second switch element are simple to control, have stable performance, low cost, and are easily available.

[0104] Optionally, the cooking appliance is configured as:

[0105] The ratio of the absolute value of the difference between the maximum value and the average value of the inductance value of the resonant inductor to the average value of the inductance value of the resonant inductor is less than or equal to 20%, and the ratio of the absolute value of the difference between the minimum value and the average value of the inductance value of the resonant inductor to the average value of the inductance value of the resonant inductor is less than or equal to 20%; or

[0106] The sum of the inductance values ​​of the side coils connected in series with the bottom coil in the resonant inductor is less than 20% of the inductance value of the bottom coil.

[0107] According to the present application, the inductance value of the resonant inductor remains relatively stable, which is beneficial to the stability of the electromagnetic compatibility performance of the cooking appliance.

[0108] Optionally, the electromagnetic heating cooking appliance further comprises a temperature sensor for sensing the cooking heating temperature, wherein the temperature sensor is electrically connected to the control device.

[0109] The control device is configured to receive the temperature value sensed by the temperature sensor during the cooking and heating process, and determine the amount of the food according to the heating time taken for the cooking and heating temperature to reach a preset temperature, wherein the longer the heating time is, the greater the amount of the food.

[0110] Further, the preset temperature is 60 to 80° C.; and / or

[0111] The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount.

[0112] When the heating time is less than 5 minutes, the control device determines that the amount of the food is a small amount.

[0113] When the heating time is greater than or equal to 5 minutes and less than 8 minutes, the control device determines that the amount of the food is a medium amount.

[0114] When the heating time is greater than or equal to 8 minutes, the control device determines that the amount of the food is large.

[0115] According to the present application, the cooking appliance automatically determines the amount of food according to the time taken for the food to heat up, and the cooking appliance is highly intelligent. BRIEF DESCRIPTION OF THE DRAWINGS

[0116] The following drawings of the present application are used as a part of the present application for understanding the present application. The drawings show the implementation modes of the present application and the description thereof, and are used to explain the principle of the present application.

[0117] In the attached figure:

[0118] Figure 1It is a three-dimensional schematic diagram of an electromagnetic heating cooking appliance according to a specific embodiment of the present application;

[0119] Figure 2 A circuit diagram of an example of a resonant circuit of an electromagnetic heating cooking appliance according to a specific embodiment of the present application;

[0120] Figure 3 A circuit diagram of another example of a resonant circuit of an electromagnetic heating cooking appliance according to a specific embodiment of the present application;

[0121] Figure 4 A circuit diagram of another example of a resonant circuit of an electromagnetic heating cooking appliance according to a specific embodiment of the present application;

[0122] Figure 5 A circuit diagram of another example of a resonant circuit of an electromagnetic heating cooking appliance according to a specific embodiment of the present application;

[0123] Figure 6 It is a side view schematic diagram of a coil of a resonant inductor of an electromagnetic heating cooking appliance according to a specific embodiment of the present application;

[0124] Figure 7 It is a three-dimensional schematic diagram of the coil distribution of the resonant inductor of the electromagnetic heating cooking appliance according to the specific embodiment of the present application.

[0125] Description of reference numerals:

[0126] 10: Claypot

[0127] 11: Inner pot

[0128] 20: Cover

[0129] 21: Removable cover

[0130] 22: Upper cover

[0131] 30: Interactive Installation

[0132] 40: Resonant Circuit

[0133] 41; Resonant capacitor

[0134] 45: Resonant inductor

[0135] 51: Coil

[0136] 52: Bottom coil

[0137] 53: Side coil

[0138] 54: First side coil

[0139] 55: Second side coil

[0140] 56: Third side coil

[0141] 57: Wire

[0142] 61 / 61A / 61B / 61C: First switch element

[0143] 62 / 62A / 62B / 62C: Second switch element

[0144] 64: Branch Road

[0145] 68: Three-way relay

[0146] 100: Cooking Utensils DETAILED DESCRIPTION

[0147] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0148] In order to thoroughly understand the present application, a detailed description will be provided in the following description. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. Obviously, the implementation of the embodiments of the present application is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other embodiments.

[0149] Ordinal numbers such as "first" and "second" cited in this application are merely identifiers and do not have any other meaning, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component". The use of the words "first", "second", and "third" does not indicate any order, and these words can be interpreted as names.

[0150] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in this application are for illustrative purposes only and are not limiting.

[0151] The present application provides an electromagnetic heating cooking appliance and a control method thereof.

[0152] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings.

[0153] like Figure 1As shown, in a specific embodiment, the electromagnetic heating cooking utensil 100 according to the present invention may include a pot body 10 and a cover body 20. Generally, the pot body 10 includes an inner pot 11, and the inner pot 11 is used to hold food. The pot body 10 may have a storage portion in a cylindrical shape (or other shapes), and the inner pot 11 may be freely placed in or taken out of the storage portion to facilitate the cleaning of the inner pot 11. The inner pot 11 is made of a metal material and is constructed as a rotating body with an opening and an inner cavity formed by a pot wall. The capacity of the inner pot 11 is generally less than 6L, for example, the capacity of the inner pot 11 may be 2L or 4L, etc. Of course, the capacity of the inner pot 11 may also exceed 6L, for example, 8L.

[0154] The cover 20 may include a detachable cover 21 and an upper cover 22, wherein the detachable cover 21 is detachably connected to the upper cover 22. The cover 20 may be pivotally connected to the pot body 10 via a pivot shaft, and is used to cover the pot body 10. When the cover 20 covers the pot body 10, a cooking space is formed between the detachable cover 21 and the inner pot 11.

[0155] The pot body 10 is provided with a heating device (IH heating device), a control device (not shown) and a lower temperature sensor (not shown). The heating device is used to heat the food in the inner pot 11. The control device can be, for example, a microcontrol unit (MCU), which is used to realize cooking control of the cooking utensil 100. The lower temperature sensor is used to detect the temperature of the inner pot 11, that is, the cooking heating temperature, which can be set at the bottom center of the pot body 10, or at the side of the pot body 10. A top temperature sensor (not shown) can also be set on the cover body 20, and the top temperature sensor is used to detect the temperature at the top of the cooking space. The heating device, the lower temperature sensor and the top temperature sensor are all electrically connected to the control device. The temperature sensing component feeds back the sensed temperature to the control device, so that the control device can realize more accurate control of, for example, the heating device based on the temperature information.

[0156] The cooking appliance 100 generally further includes an interactive device 30 for the user to input command information. The interactive device 30 may include a mechanical button, a touch membrane switch, a capacitive touch screen, a resistive touch screen, a menu option of the control software, a remote controller of the cooking appliance 100, and other forms that can realize the human interaction function, and the present invention does not specifically limit this. The interactive device 30 of the cooking appliance 100 may be set to the cover 20 or to the pot body 10. The control device is electrically connected to the interactive device 30 to receive the command information input by the user, and control the cooking appliance 100 to complete the corresponding task according to the user's command.

[0157] The cooking process of the cooking device 100 includes a preheating stage, a water absorption stage, a boiling stage, a boiling maintenance stage, a cooking stage and a heat preservation stage. The preheating stage is used to preliminarily heat the ingredients. In the water absorption stage, the ingredients are soaked in warm water so that the ingredients can fully absorb water to improve the taste. In the boiling stage, high heat is used to heat to a temperature close to boiling, and then the boiling is maintained in the boiling maintenance stage so that the ingredients are basically cooked. In the cooking stage, the residual free water is dried to further cook the ingredients. Finally, in the heat preservation stage, the food is kept warm by intermittent heating so that the user can eat hot food.

[0158] like Figures 2 to 5 As shown, the cooking utensil 100 is heated by a resonant circuit 40, that is, the heating device of the cooking utensil 100 includes a resonant circuit 40. The resonant circuit 40 is arranged on the pot body 10. The resonant circuit 40 includes a resonant capacitor 41 and a resonant inductor 45. The resonant inductor 45 is composed of at least one coil 51.

[0159] like Figure 6 As shown, the coil 51 is usually wound with a plurality of turns by a wire 57. Both ends of the wire 57 are led out to serve as terminals. The coil 51 is usually arranged close to the inner pot 11. When the alternating current in the coil 51 generates an alternating magnetic field around the coil 51, the alternating magnetic field generates eddy currents in the pot wall of the inner pot 11, thereby generating heat in the pot wall, and heating the food in the inner pot 11.

[0160] like Figure 7 As shown, preferably, the coil 51 includes a bottom coil 52 and a plurality of side coils 53. The bottom coil 52 is arranged at the bottom of the pot body 10, below the inner pot 11, and is used to heat the bottom of the cooking space. The plurality of side coils 53 are arranged at the side of the pot body 10, on the side of the inner pot 11, and are used to heat the side of the cooking space. The side coils 53 are, for example, wound around the outer circumference of the side wall of the inner pot 11. The side coils 53 are used to be connected in series with the bottom coil 52.

[0161] like Figures 2 to 5 As shown, the resonant capacitor 41 is disposed in the pot body 10. One end (first end) of the resonant capacitor 41 is connected to the bottom coil 52, and the other end (second end) of the resonant capacitor 41 is used to connect to at least one side coil 53, so as to form an electromagnetic heating resonant circuit 40 with the bottom coil 52 and at least one side coil 53.

[0162] The control method of the cooking appliance 100 includes: during the cooking and heating process, the bottom coil 52 and the at least one side coil 53 are connected in series to form the resonant inductance 45 of the electromagnetic heating resonant circuit 40. That is, during the cooking and heating process, the bottom coil 52 and the at least one side coil 53 are both made to generate an alternating magnetic field, so that the bottom and the side of the inner pot 11 are both heated, and three-dimensional heating is achieved.

[0163] No matter how the bottom coil 52 is connected in series with at least one side coil 53, it is preferred to ensure that the inductance value of the series-connected resonant inductor 45 is substantially constant. When the resonant capacitor 41 remains unchanged, the resonant inductor 45 has an optimal inductance value that matches the capacitance value of the resonant capacitor 41. Under the optimal inductance value, the cooking appliance 100 has better performance. For example, the matching of the resonant capacitor 41 and the resonant inductor 45 has a great influence on the electromagnetic compatibility performance. Keeping the resonant inductor 45 substantially constant is conducive to maintaining the stable electromagnetic compatibility performance of the cooking appliance 100.

[0164] In the present application, the inductance value of the resonant inductor 45 is substantially constant, which means that the value of the resonant inductor 45 is constant or substantially constant, that is, the fluctuation of its inductance value does not exceed the preset error. For example, the absolute value of the difference between any two of the maximum value, minimum value and average value of the inductance value and the ratio of any one of the maximum value, minimum value and average value of the inductance value is less than or equal to the preset error. The preset error is, for example, 10% to 20%.

[0165] Specifically, Figures 2 to 5 As shown, the resonant circuit 40 of the cooking appliance 100 is provided with a plurality of first switching elements 61, each of which is connected to at least one side coil 53, and different first switching elements 61 are connected to different side coils 53. Thus, when one of the plurality of first switching elements 61 is turned on, the bottom coil 52 is connected in series with at least one of the plurality of side coils 53 to form a resonant inductor 45; when the plurality of first switching elements 61 are turned off, the resonant circuit 40 is disconnected. The control device is electrically connected to the plurality of first switching elements 61 to control the on and off of the plurality of first switching elements 61. During the cooking and heating process, the control device is configured to control one of the plurality of first switching elements 61 to be turned on, so that the bottom coil 52 is connected in series with at least one side coil 53 to form a resonant inductor 45 of the electromagnetic heating resonant circuit 40. The inductance value of the resonant inductor 45 is kept constant.

[0166] like Figure 7As shown, preferably, a plurality of side coils 53 are arranged at intervals along the height direction of the pot body 10. The control method of the cooking appliance 100 further includes: during the cooking and heating process, judging the amount of food in the inner pot 11, and connecting the bottom coil 52 in series with at least one side coil 53 according to the amount of food. Wherein, when the amount of food is small, the position of at least one of the side coils 53 connected in series with the bottom coil 52 is lower than the position of at least one side coil 53 connected in series with the bottom coil 52 when the amount of food is large. Further, when the amount of food is small, the position of the highest one of the side coils 53 connected in series with the bottom coil 52 is not higher than the position of the highest one of the side coils 53 connected in series with the bottom coil 52 when the amount of food is large. Thus, when the amount of food is small, the heating position of the side wall of the inner pot 11 is relatively low, and when the amount of food is large, the heating position of the side wall of the inner pot 11 is relatively high, so that the heating position of the cooking space can be controlled more accurately.

[0167] In the present application, the number of the side coils 53 and the number of food amount levels may be the same or different.

[0168] Specifically, during the cooking and heating process, the control device determines the amount of food, and controls one of the plurality of first switch elements 61 to be turned on according to the amount of food, so that the bottom coil 52 is connected in series with at least one side coil 53 to form a resonant inductor 45. Among them, when the amount of food is small, the position of at least one of the side coils 53 connected in series with the bottom coil 52 is lower than the position of at least one side coil 53 connected in series with the bottom coil 52 when the amount of food is large, and when the amount of food is small, the position of the highest one of the side coils 53 connected in series with the bottom coil 52 is not higher than the position of the highest one of the side coils 53 connected in series with the bottom coil 52 when the amount of food is large.

[0169] For example, the cooking appliance 100 includes three side coils 53, namely a first side coil 54, a second side coil 55 and a third side coil 56, and the first side coil 54, the second side coil 55 and the third side coil 56 are arranged in order from low to high along the height direction of the pot body 10.

[0170] The amount of food includes three levels, for example, small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount. During the cooking and heating process, one of the plurality of first switch elements 61 is controlled to be turned on, so that the bottom coil 52 is connected in series with one or two of the first side coil 54, the second side coil 55 and the third side coil 56 to form a resonant inductor 45, so that the heating part of the inner pot 11 corresponds to the three levels of rice amount. That is, according to the amount of food, the resonant inductor 45 has three different combinations.

[0171] The aforementioned connecting the bottom coil 52 in series with one or two of the three side coils 53 means that the bottom coil 52 is always connected in series with one of the three side coils 53, or that the bottom coil 52 is always connected in series with two of the three side coils 53 (that is, the three coils are connected in series in sequence).

[0172] Among them, when the bottom coil 52 is always connected in series with one of the three side coils 53, the inductance of any one of the first side coil 54, the second side coil 55 and the third side coil 56 is less than or equal to 20% of the inductance of the bottom coil 52, so that the ratio of the absolute value of the difference between the maximum value and the average value of the inductance value of the resonant inductor 45 to the average value of the inductance value of the resonant inductor 45 is less than or equal to 20%, and the ratio of the absolute value of the difference between the minimum value and the average value of the inductance value of the resonant inductor 45 to the average value of the inductance value of the resonant inductor 45 is also less than or equal to 20%, and the inductance value of the resonant inductor 45 is basically constant. When the bottom coil 52 is always connected in series with two of the three side coils 53, the sum of the inductances of any two of the first side coil 54, the second side coil 55 and the third side coil 56 is less than or equal to 20% of the inductance of the bottom coil 52, so that the ratio of the absolute value of the difference between the maximum value and the average value of the inductance value of the resonant inductor 45 to the average value of the inductance value of the resonant inductor 45 is less than or equal to 20%, and the ratio of the absolute value of the difference between the minimum value and the average value of the inductance value of the resonant inductor 45 to the average value of the inductance value of the resonant inductor 45 is also less than or equal to 20%, and the inductance value of the resonant inductor 45 is basically constant.

[0173] For example, the first side coil 54, the second side coil 55 and the third side coil 56 have the same inductance. For example, the first side coil 54, the second side coil 55 and the third side coil 56 are constructed as the same coil, for example, using the same wire, having the same number of turns and diameter. For example, the bottom coil 52 is constructed with 25 turns of winding, and the inductance is 103μH; the side coils 53 are all constructed with 6 turns of winding, and the inductance is 20μH. Since the inductance of the three side coils 53 is the same, no matter which one or which two side coils 53 are connected in series with the bottom coil 52, the value of the resonant inductance 45 remains unchanged.

[0174] Of course, the first side coil 54, the second side coil 55 and the third side coil 56 can also be constructed as coils with different inductances but with a small difference in inductance. For example, the inductance of the first side coil 54 can be made smaller than the inductance of the second side coil 55, and the inductance of the second side coil 55 can be made smaller than the inductance of the third side coil 56. When the inductance increases, the heating power increases. The higher the side coil 53 is, the larger the amount of food it corresponds to, so appropriately increasing the heating power is conducive to improving cooking efficiency.

[0175] One of the methods of connecting the bottom coil 52 and the side coil 53 in series is: when the amount of food is small, during the cooking and heating process, the bottom coil 52 and the first side coil 54 are connected in series to form a resonant inductor 45; when the amount of food is medium, during the cooking and heating process, the bottom coil 52 and the second side coil 55 are connected in series to form a resonant inductor 45; when the amount of food is large, during the cooking and heating process, the bottom coil 52 and the third side coil 56 are connected in series to form a resonant inductor 45.

[0176] Specifically, Figure 2 and Figure 3 As shown, the cooking appliance 100 includes three first switch elements 61, namely 61A, 61B and 61C, and each first switch element 61 corresponds to a side coil 53 connected in series. The first switch elements 61 and the side coils 53 connected in series form a branch 64, and the branch 64 is connected between the bottom coil 52 and the resonant capacitor 41. In the illustrated embodiment, there are three branches 64 connected between the bottom coil 52 and the resonant capacitor 41, and the three branches 64 are in a parallel relationship. When the amount of food is small, during the cooking and heating process, the first switch element 61A connected in series with the first side coil 54 is controlled to be turned on, so that the bottom coil 52 is connected in series with the first side coil 54 to form a resonant inductor 45. When the amount of food is medium, during the cooking and heating process, the first switch element 61B connected in series with the second side coil 55 is controlled to be turned on, so that the bottom coil 52 is connected in series with the second side coil 55 to form a resonant inductor 45. When the amount of food is large, during the cooking and heating process, the first switch element 61C connected in series with the third side coil 56 is controlled to be turned on, so that the bottom coil 52 and the third side coil 56 are connected in series to form a resonant inductor 45 .

[0177] Any first switch element 61 can be connected in series between the bottom coil 52 and the side coil 53 (eg Figure 2 ), or can be connected in series between the side coil 53 and the resonant capacitor 41 (as shown in Figure 3 shown).

[0178] Preferably, the three first switch elements 61 are constructed in one three-way relay 68. That is, the cooking appliance 100 includes the three-way relay 68, which provides three first switch elements 61, and one first switch element 61 is formed in each way.

[0179] like Figure 4 and Figure 5As shown, the cooking appliance 100 further includes a plurality of second switch elements 62, each of which is used to be connected to at least one side coil 53. The control device is electrically connected to the plurality of second switch elements 62 to control the on and off of the plurality of second switch elements 62. During the cooking and heating process, the control device is configured to control one of the plurality of first switch elements 61 and at most two of the plurality of second switch elements 62 to be turned on, so that the bottom coil 52 is connected in series with the two side coils 53 to form a resonant inductor 45.

[0180] That is, the second method of connecting the bottom coil 52 and the side coil 53 in series is: when the amount of food is small, during the cooking and heating process, the bottom coil 52, the first side coil 54 and the second side coil 55 are connected in series to form a resonant inductor 45; when the amount of food is medium, during the cooking and heating process, the bottom coil 52, the first side coil 54 and the third side coil 56 are connected in series to form a resonant inductor 45; when the amount of food is large, during the cooking and heating process, the bottom coil 52, the second side coil 55 and the third side coil 56 are connected in series to form a resonant inductor 45.

[0181] Specifically, Figure 4 As shown, the cooking appliance 100 includes two first switch elements 61 (respectively 61A and 61B) and three second switch elements 62 (respectively 62A, 62B and 62C). Among them, one first switch element 61A is connected in series with the first side coil 54, and another first switch element 61B is connected in series with the second side coil 55. The second switch element 62A is connected between the first side coil 54 and the second side coil 55, the second switch element 62B is connected between the first side coil 54 and the third side coil 56, and the second switch element 62C is connected between one end of the third side coil 56 for connecting to the second side coil 55 and the second end of the resonant capacitor 41. The second end of the resonant capacitor 41 is also connected to the third side coil 56.

[0182] When the amount of food is small, during the cooking and heating process, the first switch element 61A connected in series with the first side coil 54, the second switch element 62A connected between the first side coil 54 and the second side coil 55, and the second switch element 62C connected between one end of the third side coil 56 for connecting to the second side coil 55 and the second end of the resonant capacitor 41 are controlled to be turned on, so that the bottom coil 52, the first side coil 54, and the second side coil 55 are connected in series to form the resonant inductor 45. When the amount of food is medium, during the cooking and heating process, the first switch element 61A connected in series with the first side coil 54 and the second switch element 62B connected between the first side coil 54 and the third side coil 56 are controlled to be turned on, so that the bottom coil 52, the first side coil 54, and the third side coil 56 are connected in series to form the resonant inductor 45. When the amount of food is large, during the cooking and heating process, the first switch element 61B connected in series with the second side coil 55 is controlled to be turned on, so that the bottom coil 52 , the second side coil 55 and the third side coil 56 are connected in series to form a resonant inductor 45 .

[0183] Or, if Figure 5 As shown, the cooking appliance 100 still includes two first switch elements 61 (respectively 61A and 61B) and three second switch elements 62 (respectively 62A, 62B and 62C). Among them, one first switch element 61A is connected in series with the first side coil 54, and another first switch element 61B is connected in series with the third side coil 56. The second switch element 62A is connected between the first side coil 54 and the second side coil 55, the second switch element 62B is connected between the first side coil 54 and the second side coil 55, and the second switch element 62C is connected between one end of the second side coil 55 for connecting to the third side coil 56 and the second end of the resonant capacitor 41. The second end of the resonant capacitor 41 is also connected to the second side coil 55.

[0184] When the amount of food is small, during the cooking and heating process, the first switch element 61A connected in series with the first side coil 54 and the second switch element 62B connected between the first side coil 54 and the second side coil 55 are controlled to be turned on, so that the bottom coil 52, the first side coil 54 and the second side coil 55 are connected in series to form the resonant inductor 45. When the amount of food is medium, during the cooking and heating process, the first switch element 61A connected in series with the first side coil 54, the second switch element 62A connected between the first side coil 54 and the third side coil 56, and the second switch element 62C connected between one end of the second side coil 55 for connecting to the third side coil 56 and the second end of the resonant capacitor 41 are controlled to be turned on, so that the bottom coil 52, the first side coil 54 and the third side coil 56 are connected in series to form the resonant inductor 45. When the amount of food is large, during the cooking and heating process, the first switch element 61B connected in series with the second side coil 55 is controlled to be turned on, so that the bottom coil 52 , the second side coil 55 and the third side coil 56 are connected in series to form a resonant inductor 45 .

[0185] Any first switch element 61 can be connected in series between the bottom coil 52 and the side coil 53 (eg Figure 4 ), or can be connected in series between the side coil 53 and the resonant capacitor 41 (as shown in Figure 5 shown).

[0186] The first switching element 61 is configured as, for example, a relay. The second switching element 62 is also configured as, for example, a relay.

[0187] The present application controls the different on-off states of multiple switch elements to realize the series connection of the bottom coil 52 and different side coils 53. In the above technical solution, the switch elements that need to be turned on are described for each case, and the switch elements not mentioned are in the off state.

[0188] In the present application, connecting the bottom coil 52 and the side coil 53 in series during the heating process means that the bottom coil 52 and the side coil 53 are kept in series during the heating process, that is, by keeping the first switch element 61 and / or the second switch element 62 turned on during the heating process, the desired combination of resonant inductance 45 is achieved. The series conduction between the coils (that is, the conduction of the switch elements) can be completed before the operation of the heating device, and can also be completed synchronously with the operation of the heating device.

[0189] As mentioned above, the cooking appliance 100 selects the side coil 53 according to the amount of food. Preferably, during the cooking heating process, the cooking appliance 100 judges the amount of food according to the heating time taken for the cooking heating temperature to reach a preset temperature (e.g., 60°C to 70°C). Among them, the longer the heating time, the more food. Specifically, during the cooking heating process, the control device receives the temperature value sensed by the temperature sensor, and judges the amount of food according to the heating time taken for the cooking heating temperature to reach a preset temperature. For example, the control device first obtains the temperature value sensed by the temperature sensor before heating, then starts heating and timing, and when the temperature reaches the preset temperature, the control device calculates the heating time. The longer the heating time, the more food.

[0190] For example, when the amount of ingredients includes three levels of small amount, medium amount and large amount, the heating time can be divided into three continuous and non-overlapping intervals, each interval corresponding to a level of ingredient amount. The correspondence between the preset temperature, the heating time and the amount of ingredients can be established in advance through experiments, and the relationship can be saved in the memory of the cooking appliance 100 for the control device to retrieve. For example, the preset temperature is 60 to 80°C. When the heating time is less than 5 minutes, the control device determines that the amount of the ingredient is a small amount; when the heating time is greater than or equal to 5 minutes and less than 8 minutes, the control device determines that the amount of the ingredient is a medium amount; when the heating time is greater than or equal to 8 minutes, the control device determines that the amount of the ingredient is a large amount.

[0191] The above process of judging the amount of food can be set in the preheating stage and the water absorption stage.

[0192] In the process of determining the amount of food, since the amount of food is not yet known, any one of the three selection modes of the side coil 53 can be selected to form the resonant inductor 45, that is, the side coil 53 can be selected according to any one of the small amount, medium amount, and large amount of food. Preferably, the side coil 53 is selected according to the small amount of food. After the amount of food is analyzed, the side coil 53 is reselected according to the actual amount of food.

[0193] Alternatively, the user may also set the amount of food through the interactive device 30, so that the control device can easily know the amount of food and select the side coil 53 according to the amount of food from the beginning of heating.

[0194] The embodiment of the present application only provides an embodiment of arranging three coils on the upper and lower sides corresponding to three levels of food quantity. Those skilled in the art can completely design a control scheme for the side coils corresponding to other levels of food quantity according to the teachings of the present application, wherein the number of side coils and the number of food quantity levels can be the same or different. For example, four coils can be arranged on the upper and lower sides, and two of them are selected to be connected in series with the bottom coil during heating. There are six selection methods for selecting two coils from the four coils, so it can correspond to six amounts of rice.

[0195] It is understandable that the setting and control methods of the switch component are not unique, as long as it can form a three-dimensional heating effect (for example, accurately controlling the heating area of ​​the inner pot wall according to the amount of food).

[0196] Preferably, the sum of the inductance values ​​of the side coils 53 connected in series with the bottom coil 52 is less than or equal to 20% of the inductance value of the bottom coil 52. According to the present application, a side coil 53 with a relatively small inductance is added to the side of the pot body, so that three-dimensional heating is achieved on the basis of the technical solution with only the bottom coil 52 by a simple method, that is, only the side coil 53 is added, and the original bottom coil 52 and the resonant capacitor 41 are retained. The cooking utensil without the three-dimensional heating function is improved to have the three-dimensional heating function by a simple method, saving the development cost. For example, the existing old product has only the bottom coil 52, and the parameter is 103μH. When the side coil 53 is added during the upgrade and improvement, it is only necessary to control the sum of the inductance values ​​of the side coils 53 connected in series with the bottom coil 52 to not exceed 20% of 103μH, for example, it can be 20μH. In this way, the inductance value of the resonant inductor 45 during cooking heating is 123μH, and the original resonant capacitor 41 can still be used to form the resonant circuit 40 without much effect on the performance of the cooking utensil.

[0197] Preferably, the ratio of the absolute value of the difference between the maximum value and the average value of the inductance of the resonant inductor 45 to the average value of the inductance of the resonant inductor 45 is less than or equal to 20%, and the ratio of the absolute value of the difference between the minimum value and the average value of the inductance of the resonant inductor 45 to the average value of the inductance of the resonant inductor 45 is less than or equal to 20%. That is, the inductance of the resonant inductor 45 can fluctuate by 20% and the fluctuation range is small, so that the inductance of the resonant inductor 45 remains relatively constant, thereby improving the electromagnetic compatibility performance of the cooking appliance.

[0198] According to the present application, the electromagnetic heating cooking appliance realizes three-dimensional heating according to the amount of food, so that the food in the inner pot is heated evenly from top to bottom, thereby improving the user experience.

[0199] The processes and steps described in all the above preferred embodiments are only examples. Unless adverse effects occur, various processing operations can be performed in a sequence different from the sequence of the above processes. The sequence of steps in the above processes can also be increased, merged or deleted according to actual needs.

[0200] In understanding the scope of the present application, the term "comprising" and its derivatives as used herein are intended to be open terms, which specify the existence of the recorded features, elements, components, groups, wholes and / or steps, but do not exclude the existence of other unrecorded features, elements, components, groups, wholes and / or steps. This concept also applies to words with similar meanings, such as the terms "including", "having" and their derivatives.

[0201] The terms "attached" or "attached" as used herein include: a configuration where an element is directly secured to another element by directly securing the element to the other element; a configuration where an element is indirectly secured to another element by securing the element to an intermediate member which in turn is secured to the other element; and a configuration where one element is integral with the other element, i.e., one element is substantially a part of the other element. This definition also applies to words with similar meanings such as "connect," "connect," "couple," "mount," "bond," "fix," and their derivatives. Finally, terms of degree such as "substantially," "approximately," and "approximately" as used herein represent the amount of deviation that modifies the term such that the end result will not be significantly changed.

[0202] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present application. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present application. The features described herein in one embodiment may be applied to another embodiment individually or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0203] The present application has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present application to the described embodiments. In addition, it can be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present application, and these variations and modifications all fall within the scope of protection claimed by the present application.

Claims

1. A control method for an electromagnetic heating cooking appliance, the electromagnetic heating cooking appliance comprising: pot body; An inner pot, arranged in the pot body, for containing food; A bottom coil is arranged at the bottom of the pot body; and A plurality of side coils are arranged on the side of the pot body, and the plurality of side coils are arranged at intervals along the height direction of the pot body. Characterized in that the control method comprises: During the cooking and heating process, the bottom coil is connected in series with at least one of the side coils according to the amount of food, so as to form a resonant inductance of the electromagnetic heating resonant circuit.

2. The control method according to claim 1, characterized in that: When the amount of the food is small, the position of at least one of the side coils connected in series with the bottom coil is lower than the position of at least one of the side coils connected in series with the bottom coil when the amount of the food is large. The position of the highest one of the side coils connected in series with the bottom coil when the amount of the food is small is not higher than the position of the highest one of the side coils connected in series with the bottom coil when the amount of the food is large.

3. The control method according to claim 2, characterized in that: The electromagnetic heating cooking appliance includes three side coils, a first side coil, a second side coil and a third side coil, and the first side coil, the second side coil and the third side coil are arranged in order from low to high along the height direction of the pot body.

4. The control method according to claim 3, characterized in that: During the cooking heating process, the bottom coil is kept in series with one of the first side coil, the second side coil and the third side coil, wherein the inductance of any one of the first side coil, the second side coil and the third side coil is less than or equal to 20% of the inductance of the bottom coil; or During the cooking heating process, the bottom coil is maintained in series with two of the first side coil, the second side coil and the third side coil, wherein the sum of the inductances of any two of the first side coil, the second side coil and the third side coil is less than or equal to 20% of the inductance of the bottom coil.

5. The control method according to claim 3, characterized in that: The first side coil, the second side coil and the third side coil are configured as the same coil or have the same inductance; or The inductance of the first side coil is smaller than the inductance of the second side coil, and the inductance of the second side coil is smaller than the inductance of the third side coil.

6. The control method according to claim 3, characterized in that: The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount. When the amount of the food is the small amount, during the cooking and heating process, the bottom coil and the first side coil are kept in series connection to form the resonant inductor. When the amount of the food is the medium amount, during the cooking and heating process, the bottom coil and the second side coil are kept in series connection to form the resonant inductor. When the amount of the food is the large amount, during the cooking and heating process, the bottom coil and the third side coil are kept connected in series to form the resonant inductance.

7. The control method according to claim 3, characterized in that: The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount. When the amount of the food is the small amount, during the cooking and heating process, the bottom coil, the first side coil and the second side coil are kept connected in series to form the resonant inductor. When the amount of the food is the medium amount, during the cooking and heating process, the bottom coil, the first side coil and the third side coil are kept connected in series to form the resonant inductor. When the amount of the food is the large amount, during the cooking heating process, the bottom coil, the second side coil and the third side coil are kept connected in series to form the resonant inductance.

8. The control method according to claim 1, characterized in that: The ratio of the absolute value of the difference between the maximum value and the average value of the inductance value of the resonant inductor to the average value of the inductance value of the resonant inductor is less than or equal to 20%, and the ratio of the absolute value of the difference between the minimum value and the average value of the inductance value of the resonant inductor to the average value of the inductance value of the resonant inductor is less than or equal to 20%; or The sum of the inductance values ​​of the side coils connected in series with the bottom coil in the resonant inductor is less than or equal to 20% of the inductance value of the bottom coil.

9. The control method according to any one of claims 1 to 8, characterized in that: It also includes judging the amount of the ingredients during the cooking and heating process, including: During the cooking and heating process, the amount of the food is determined based on the heating time taken for the cooking and heating temperature to reach a preset temperature, wherein the longer the heating time is, the greater the amount of the food.

10. The control method according to claim 9, characterized in that: The preset temperature is 60 to 80° C.; and / or The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount. When the heating time is less than 5 minutes, it is determined that the amount of the food is small. When the heating time is greater than or equal to 5 minutes and less than 8 minutes, the amount of the food is determined to be medium. When the heating time is greater than or equal to 8 minutes, it is determined that the amount of the food is large.

11. An electromagnetic heating cooking appliance, characterized in that: include: pot body; An inner pot, arranged in the pot body, for containing food; A bottom coil is arranged at the bottom of the pot body; A plurality of side coils are arranged at the side of the pot body and are used to be connected to the bottom coil. The plurality of side coils are arranged at intervals along the height direction of the pot body. A resonant capacitor is disposed in the pot body, one end of the resonant capacitor is connected to the bottom coil, and the other end of the resonant capacitor is used to connect at least one of the side coils to form an electromagnetic heating resonant circuit with the bottom coil and the at least one side coil; A plurality of first switch elements, each of which is connected to at least one of the side coils, and different first switches are connected to different side coils; and A control device is electrically connected to the plurality of first switch elements to control the on and off of the plurality of first switch elements. During the cooking and heating process, the control device is configured to control one of the plurality of first switch elements to remain on according to the amount of the food, so that the bottom coil and at least one of the side coils remain connected in series to form a resonant inductance of the electromagnetic heating resonant circuit.

12. The electromagnetic heating cooking device according to claim 11, characterized in that: The cooking appliance is configured as follows: When the amount of the food is small, the position of at least one of the side coils connected in series with the bottom coil is lower than the position of at least one of the side coils connected in series with the bottom coil when the amount of the food is large. The position of the highest one of the side coils connected in series with the bottom coil when the amount of the food is small is not higher than the position of the highest one of the side coils connected in series with the bottom coil when the amount of the food is large.

13. The electromagnetic heating cooking device according to claim 12, characterized in that: The invention comprises three side coils, namely a first side coil, a second side coil and a third side coil, wherein the first side coil, the second side coil and the third side coil are arranged in order from low to high along the height direction of the pot body.

14. The electromagnetic heating cooking device according to claim 13, characterized in that: The control device is configured as follows: During the cooking heating process, controlling one of the plurality of first switching elements to remain turned on, so that the bottom coil is connected in series with one of the first side coil, the second side coil, and the third side coil to form the resonant inductor, wherein the inductance of any one of the first side coil, the second side coil, and the third side coil is less than or equal to 20% of the inductance of the bottom coil; or During the cooking heating process, one of the multiple first switching elements is controlled to remain turned on, so that the bottom coil is connected in series with two of the first side coil, the second side coil and the third side coil to form the resonant inductance, wherein the sum of the inductances of any two of the first side coil, the second side coil and the third side coil is less than or equal to 20% of the inductance of the bottom coil.

15. The electromagnetic heating cooking device according to claim 13, characterized in that: The first side coil, the second side coil and the third side coil are configured as the same coil or have the same inductance; or The inductance of the first side coil is smaller than the inductance of the second side coil, and the inductance of the second side coil is smaller than the inductance of the third side coil.

16. The electromagnetic heating cooking device according to claim 13, characterized in that: It comprises three first switch elements, each of which corresponds to one of the side coils connected in series, and the first switch elements connected in series and the side coils form a branch, and the branch is connected between the bottom coil and the resonant capacitor; The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount, and the control device is configured as follows: When the amount of the food is the small amount, during the cooking and heating process, the first switch element connected in series with the first side coil is controlled to remain turned on, so that the bottom coil and the first side coil remain connected in series to form the resonant inductor. When the amount of the food is the medium amount, during the cooking and heating process, the first switch element connected in series with the second side coil is controlled to remain turned on, so that the bottom coil and the second side coil remain connected in series to form the resonant inductor. When the amount of the food is the large amount, during the cooking and heating process, the first switch element connected in series with the third side coil is controlled to remain turned on, so that the bottom coil and the third side coil remain connected in series to form the resonant inductor.

17. The electromagnetic heating cooking device according to claim 16, characterized in that: A three-way relay is included, and the three-way relay provides the three first switching elements.

18. The electromagnetic heating cooking device according to claim 13, characterized in that: It also includes a plurality of second switch elements, each of which is used to be connected to at least one of the side coils, wherein the control device is electrically connected to the plurality of second switch elements to control the on and off of the plurality of second switch elements. During the cooking heating process, the control device is configured to control one of the plurality of first switching elements and at most two of the plurality of second switching elements to remain turned on, so that the bottom coil and the two side coils remain connected in series to form the resonant inductance.

19. The electromagnetic heating cooking device according to claim 18, characterized in that: The electromagnetic heating cooking appliance comprises: two first switching elements, one of which is connected in series with the first side coil, and the other of which is connected in series with the second side coil, and three second switching elements, one of which is connected between the first side coil and the second side coil, one is connected between the first side coil and the third side coil, and one is connected between one end of the third side coil for connecting to the second side coil and the other end of the resonant capacitor; The other end of the resonant capacitor is also connected to the third side coil; The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount, and the control device is configured as follows: When the amount of the food is the small amount, during the cooking and heating process, the first switch element connected in series with the first side coil, the second switch element connected between the first side coil and the second side coil, and the second switch element connected between one end of the third side coil for connecting with the second side coil and the other end of the resonant capacitor are controlled to remain turned on, so that the bottom coil, the first side coil, and the second side coil remain connected in series to form the resonant inductor. When the amount of the food is the medium amount, during the cooking and heating process, the first switch element connected in series with the first side coil and the second switch element connected between the first side coil and the third side coil are controlled to remain turned on, so that the bottom coil, the first side coil and the third side coil remain connected in series to form the resonant inductor. When the amount of the food is the large amount, during the cooking and heating process, the first switching element connected in series with the second side coil is controlled to remain turned on, so that the bottom coil, the second side coil and the third side coil remain connected in series to form the resonant inductor.

20. The electromagnetic heating cooking device according to claim 18, characterized in that: The electromagnetic heating cooking appliance comprises: two first switching elements, one of which is connected in series with the first side coil, and the other of which is connected in series with the third side coil, and three second switching elements, one of which is connected between the first side coil and the second side coil, one is connected between the first side coil and the third side coil, and one is connected between one end of the second side coil for connecting to the third side coil and the other end of the resonant capacitor; The other end of the resonant capacitor is also connected to the second side coil; The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount, and the control device is configured as follows: When the amount of the food is the small amount, during the cooking and heating process, the first switch element connected in series with the first side coil and the second switch element connected between the first side coil and the second side coil are controlled to remain turned on, so that the bottom coil, the first side coil and the second side coil remain connected in series to form the resonant inductor. When the amount of the food is the medium amount, during the cooking and heating process, the first switch element connected in series with the first side coil, the second switch element connected between the first side coil and the third side coil, and the second switch element connected between one end of the second side coil for connecting to the third side coil and the other end of the resonant capacitor are controlled to remain turned on, so that the bottom coil, the first side coil, and the third side coil remain connected in series to form the resonant inductor. When the amount of the food is the large amount, during the cooking and heating process, the first switching element connected in series with the third side coil is controlled to remain turned on, so that the bottom coil, the second side coil and the third side coil remain connected in series to form the resonant inductor.

21. The electromagnetic heating cooking device according to claim 18, characterized in that: The first switching element and / or the second switching element is configured as a relay.

22. The electromagnetic heating cooking device according to claim 11, characterized in that: The cooking appliance is configured as follows: The ratio of the absolute value of the difference between the maximum value and the average value of the inductance value of the resonant inductor to the average value of the inductance value of the resonant inductor is less than or equal to 20%, and the ratio of the absolute value of the difference between the minimum value and the average value of the inductance value of the resonant inductor to the average value of the inductance value of the resonant inductor is less than or equal to 20%; or The sum of the inductance values ​​of the side coils connected in series with the bottom coil in the resonant inductor is less than or equal to 20% of the inductance value of the bottom coil.

23. The electromagnetic heating cooking device according to any one of claims 11 to 22, characterized in that: It also includes a temperature sensor for sensing the cooking heating temperature, and the temperature sensor is electrically connected to the control device. The control device is configured to receive the temperature value sensed by the temperature sensor during the cooking and heating process, and determine the amount of the food according to the heating time taken for the cooking and heating temperature to reach a preset temperature, wherein the longer the heating time is, the greater the amount of the food.

24. The electromagnetic heating cooking device according to claim 23, characterized in that: The preset temperature is 60 to 80° C.; and / or The amount of the food material includes three levels: small amount, medium amount and large amount, wherein the small amount is smaller than the medium amount, and the medium amount is smaller than the large amount. When the heating time is less than 5 minutes, the control device determines that the amount of the food is a small amount. When the heating time is greater than or equal to 5 minutes and less than 8 minutes, the control device determines that the amount of the food is a medium amount. When the heating time is greater than or equal to 8 minutes, the control device determines that the amount of the food is large.

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