Method for detecting absence of water in cooking utensil, cooking device and storage medium

Abstract

The present application discloses a method for detecting the absence of water in a cooking utensil, a cooking device and a storage medium. Among them, a magnetic conductive layer is provided at the bottom of the cooking utensil, and the cooking utensil is heated by electromagnetic induction heating. The detection method includes: heating the cooking utensil with a set power; obtaining the temperature of the magnetic conductive layer at a preset time interval, and the temperature of the magnetic conductive layer includes at least an initial temperature; in response to the difference between the temperature of the magnetic conductive layer and the initial temperature being greater than a temperature difference threshold, determining that there is no water in the cooking utensil. In the above manner, the present embodiment can quickly and accurately detect the absence of water in the cooking utensil, and the detection result has a high degree of credibility.

Description

Technical Field

[0001] The present application relates to the technical field of kitchen appliances, and in particular to a method for detecting the absence of water in a cooking utensil, a cooking device and a storage medium. Background Art

[0002] At present, with the development of related technologies of intelligent kitchen and bathroom equipment, more and more electromagnetic heating cooking devices are equipped with anti-dry burning structures or anti-overflow structures to prevent the food in the cooking utensils from boiling and overflowing during the heating process, or dry burning, and improve the safety of use. However, most of the current waterless detection solutions are not accurate and often have false detection phenomena. Summary of the invention

[0003] The present application mainly provides a method for detecting the absence of water in a cooking utensil, a cooking device and a storage medium, which can solve the problem of low accuracy in detecting the absence of water in a cooking utensil in the prior art.

[0004] To solve the above technical problems, the first aspect of the present application provides a method for detecting that there is no water in a cooking utensil. A magnetic conductive layer is provided at the bottom of the cooking utensil, and the cooking utensil is heated by electromagnetic induction heating. The detection method comprises: heating the cooking utensil with a set power; obtaining the temperature of the magnetic conductive layer at a preset time interval, wherein the temperature of the magnetic conductive layer includes at least an initial temperature; and determining that there is no water in the cooking utensil in response to a difference between the temperature of the magnetic conductive layer and the initial temperature being greater than a temperature difference threshold.

[0005] Optionally, the method further comprises: calculating the temperature difference threshold value according to the electromagnetic heating resonant frequency, the set power and the actual heating power.

[0006] Optionally, the calculating the temperature difference threshold according to the electromagnetic heating resonant frequency, the first heating power and the actual heating power includes: calculating the temperature difference threshold according to the following formula: Among them, Tsth is the temperature difference threshold, P is the actual heating power, P0 is the set power, Tc is the electromagnetic heating resonant frequency, and A and B are empirical parameters.

[0007] Optionally, the method further comprises: in response to the temperature of the magnetic conductive layer being greater than a first temperature threshold, determining that there is no water in the cooking utensil.

[0008] Optionally, after determining that there is no water in the cooking appliance, the method further comprises: stopping heating and issuing an alarm signal.

[0009] To solve the above technical problems, the second aspect of the present application provides a cooking device, which includes: a heating unit for heating the cooking utensil; wherein a magnetic conductive layer is provided at the bottom of the cooking utensil; a temperature detection unit for obtaining the temperature of the magnetic conductive layer and using the temperature of the magnetic conductive layer as the temperature of the cooking utensil; and a processing unit, which connects the heating unit and the temperature detection unit and is used to execute the method of the first aspect above to perform water-free detection.

[0010] Optionally, the heating unit includes a first coil; the temperature detection unit includes: a second coil, which is arranged corresponding to the center of the first coil and is used to sense the change of the magnetic permeability of the magnetic conductive layer; a third coil, the first end of the third coil is connected to the first end of the second coil, and the second end of the second coil and the second end of the third coil are connected to the processing unit; wherein the first end of the third coil and the first end of the second coil are the same end; a fourth coil, the two ends of the fourth coil are connected to the processing unit; wherein the third coil and the fourth coil are sleeved on the lead-out wire of the first coil; the processing unit is used to obtain a first voltage between the second end of the second coil and the second end of the third coil, and a second voltage at both ends of the fourth coil, and determine the temperature of the magnetic conductive layer according to the first voltage and the second voltage.

[0011] Optionally, the heating unit further includes a transistor; the processing unit is further used to obtain a driving frequency of the transistor, or a flipping frequency of a voltage across the first coil, so as to determine an electromagnetic heating resonant frequency according to the driving frequency or the flipping frequency.

[0012] Optionally, the processing unit is further used to obtain the voltage and current of the heating unit to determine the actual heating power according to the voltage and current.

[0013] To solve the above technical problem, the third aspect of the present application provides a computer-readable storage medium, in which program data is stored. When the program data is executed by a processor, it is used to implement the method provided in the first aspect above.

[0014] The beneficial effects of the present application are as follows: Different from the prior art, the bottom of the cooking utensil of the present application is provided with a magnetic conductive layer, and the cooking utensil is heated by electromagnetic induction heating. The present application heats the cooking utensil with a set power, and obtains the temperature of the magnetic conductive layer at a preset time interval, and the temperature of the magnetic conductive layer at least includes an initial temperature. In response to the difference between the temperature of the magnetic conductive layer and the initial temperature being greater than a temperature difference threshold, it is determined that there is no water in the cooking utensil. By collecting the temperature of the magnetic conductive layer at every preset time interval, the temperature change of the magnetic conductive layer of the cooking utensil is timely monitored, and the magnetic conductive layer is determined to be in an abnormally heated state of an anhydrous state according to the initial temperature of the magnetic conductive layer and the temperature difference threshold, thereby determining whether there is no water in the cooking utensil, which greatly improves the adaptability of anhydrous detection, greatly improves the accuracy, and has a fast feedback speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0016] Figure 1 is a structural schematic diagram of an embodiment of a cooking device provided by the present application;

[0017] Figure 2 is a circuit structure diagram of an embodiment of a cooking device provided by the present application;

[0018] Figure 3-7 It is a structural schematic diagram of an embodiment of various cooking utensils provided by the present application;

[0019] Figure 8 It is a schematic flow chart of an embodiment of a method for detecting that there is no water in a cooking utensil provided by the present application;

[0020] Fig. 9 is a schematic block diagram of a process for calculating a temperature difference threshold according to an embodiment of the present application;

[0021] Fig.10 is a schematic flow chart of another embodiment of the method for detecting the absence of water in a cooking utensil provided by the present application;

[0022] Fig.11 It is a structural schematic diagram of an embodiment of a computer-readable storage medium provided by the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some but not all structures related to the present application are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0024] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0025] The terms "first" and "second" in this application are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features shown. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] See also Figure 1 , Figure 1 1 is a schematic diagram of a cooking device according to an embodiment of the present invention. The cooking device 100 includes a heating unit 10 , a temperature detection unit 20 and a processing unit 30 .

[0028] The heating unit 10 is used to heat the cooking utensil.

[0029] The temperature detection unit 20 is used to obtain the temperature of the cooking appliance.

[0030] The processing unit 30 is connected to the heating unit 10 and the temperature detection unit 20 to implement the method provided in the following embodiment.

[0031] Specifically, see Figure 2 , Figure 2 1 is a schematic diagram of a circuit structure of an embodiment of a cooking device provided by the present application. The heating unit 10 includes a first coil L1.

[0032] In addition, both ends of the first coil L1 are connected to the capacitor C2, so that the first coil L1 resonates. In addition, the first lead wire of the first coil L1 is connected to the pin Va of the processing unit 30, the second lead wire of the first coil L1 is connected to the pin Vb of the processing unit 30, the second lead wire of the first coil L1 is connected to the collector C of the transistor Q1, and the base B of the transistor Q1 is connected to the processing unit 30 to receive the control of the processing unit 30 to turn on or off the transistor Q1. The emitter E of the transistor Q1 is connected to one end of the resistor R1, the capacitor C3 and the processing unit 30. The other end of the capacitor C3 is grounded.

[0033] Further, the cooking device also includes a rectifier D1, and power lines L and N are connected to the rectifier D1. The power line L is connected to one end of the diode D3, the power line N is connected to one end of the diode D4, the other ends of the diodes D3 and D4 are connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the resistor R3, one end of the capacitor C4 and the processing unit 30. The other end of the capacitor C4 is grounded. The other end of the resistor R1 is connected to an output end of the rectifier D1, and the second lead wire of the first coil L1 is connected to the other output end of the rectifier D1. The capacitor C1 is connected between the two output ends of the rectifier D1.

[0034] The resistor R1 and the capacitor C3 may form a current sampling unit 50 , and the resistors R2 , R3 , the capacitor C4 , the diode D3 and the diode D4 may form a voltage sampling unit 60 .

[0035] The processing unit 30 can obtain the voltage and current of the heating unit 10 through the current sampling unit 50 and the voltage sampling unit 60, and can determine the actual heating power according to the voltage and current.

[0036] The temperature detection unit 20 includes a second coil L2 , a third coil L3 and a fourth coil L4 . The second coil L2 is disposed corresponding to the center of the first coil L1 , and is used to sense changes in the magnetic permeability of the cooking utensil 40 .

[0037] The first end of the third coil L3 is connected to the first end of the second coil L2, and the second end of the second coil L2 and the second end of the third coil L3 are connected to the processing unit 30. The first end of the third coil L3 and the first end of the second coil L2 are the same end.

[0038] Both ends of the fourth coil L4 are connected to the processing unit 30 .

[0039] The third coil L3 and the fourth coil L4 are sleeved on the lead-out wire of the first coil L1.

[0040] The processing unit 30 is used to obtain a first voltage between the second end of the second coil L2 and the second end of the third coil L3 , and a second voltage across the fourth coil L4 , and determine the temperature of the magnetic conductive layer according to the first voltage and the second voltage.

[0041] The processing unit 30 is further used to obtain the driving frequency of the transistor Q1 or the flipping frequency of the voltage across the first coil L1 to determine the electromagnetic heating resonant frequency according to the driving frequency or the flipping frequency.

[0042] It can be understood that the cooking device 100 can be matched with a corresponding cooking utensil 40 to heat the food in the cooking utensil 40, such as cooking porridge, boiling green bean soup, and boiling water.

[0043] See also Figure 3-Figure 7 , the cooking utensil 40 involved in the present application is introduced: the cooking utensil 40 mainly includes a container body 41 and a magnetic conductive layer 42. The container body 41 includes a container wall 411 and a container bottom 412. The container bottom 412 is glass or ceramic, such as high borosilicate glass or microcrystalline glass. In some embodiments, the container wall 411 can be glass or ceramic or metal. The magnetic conductive layer 42 can generate heat by electromagnetic induction with the first coil L1.

[0044] like Figure 3 As shown, the magnetic conductive layer 42 is disposed on the outer side of the container bottom 412 , that is, close to the side of the cooking device 100 .

[0045] Furthermore, considering that the temperature of the magnetic conductive layer 42 is too high during the heating process, it is easy to cause damage to the cooking device. Figure 4 As shown, a heat insulating layer 43 is further provided on the side of the magnetic conductive layer 42 away from the container bottom 412. The heat insulating layer 43 can be made of a heat insulating material to protect the cooking device.

[0046] Further, if Figure 5 As shown, the magnetic conductive layer 42 is disposed on the inner side of the container bottom 412 and can directly contact the food in the cooking utensil 40 .

[0047] Furthermore, in order to avoid direct contact between the magnetic conductive layer and the food, Figure 6As shown, a ceramic layer 44 may be disposed on a side of the magnetic conductive layer 42 away from the container bottom 412 .

[0048] Further, if Figure 7 As shown, the container wall 411 and the container bottom 412 can be set to different materials. In this case, the container bottom 412 can be a non-metallic material, such as glass or ceramic. The container wall 411 is a metal material, or the container bottom 412 is glass and the container wall 411 is ceramic.

[0049] It is understandable that the above Figure 3-Figure 7 The container wall 411 and the container bottom 412 can be made of different materials.

[0050] In order to make the contact surface of the cooking utensil 40 and the cooking device 100 match, a groove is provided on the heating panel of the cooking device 100, and the cooking utensil 40 is placed in the groove for heating, which can improve the reliability during the heating process. A groove can also be provided on the contact panel of the cooking device 100, and a convex portion is provided on the outer periphery of the bottom 412 of the cooking utensil 40 container, and the convex portion is placed in the groove, so as to increase the stability of the cooking utensil 40 and the heating panel.

[0051] See also Figure 8 , Figure 8 1 is a schematic flow chart of an embodiment of a method for detecting the absence of water in a cooking utensil provided by the present application. Figure 8 As shown, this embodiment includes the following steps:

[0052] S11, heating the cooking appliance at a set power.

[0053] Among them, it can be a glass pot, a glass kettle, a ceramic pot, a ceramic kettle, a ceramic basin, and a glass basin. The bottom of the cooking utensil is provided with a magnetic conductive layer, and is heated by electromagnetic induction through the magnetic conductive layer and the cooking device.

[0054] In this step, the cooking appliance is heated at a set power, and the set power may be any power between 10w-2100w, for example, the set power may be 300w, 500w, 1000w, etc., not listed one by one.

[0055] S12, acquiring the temperature of the magnetic conductive layer at a preset time interval, where the temperature of the magnetic conductive layer at least includes an initial temperature.

[0056] In this embodiment, the temperature of the magnetic conductive layer is collected at preset time intervals. Since the magnetic conductive layer is provided in the cooking utensil, the collected temperature of the magnetic conductive layer can be used as the temperature of the cooking utensil.

[0057] The temperatures of the magnetically conductive layer collected can be expressed in the order of collection time as: Ts1, Ts2, Ts3, ..., Tsn. The first temperature value obtained can be used as the initial temperature.

[0058] Optionally, the preset time interval may be a time interval under a preset rule, under which the temperature of the magnetic conductive layer may be collected at non-uniform time intervals, for example, the time interval for the first 3-5 temperature collections is 3 seconds, and the time interval for temperature collections after 3-5 times may be set between 0.01 seconds and 1 second, for example, 0.01 seconds, 0.1 seconds, and 1 second; in another embodiment, the temperature of the magnetic conductive layer may be collected at uniform time intervals, and the preset time interval may be set between 0.01 seconds and 1 second, for example, 0.01 seconds, 0.1 seconds, and 1 second, which are not listed one by one.

[0059] S13, in response to the difference between the temperature of the magnetic conductive layer and the initial temperature being greater than a temperature difference threshold, determining that there is no water in the cooking appliance.

[0060] It is understandable that if there is no water in the cooking utensil, the local temperature of the cooking utensil will rise rapidly in a short period of time under continuous heating, which may eventually cause an explosion or fire, posing a safety hazard.

[0061] In this step, the temperature of the magnetic layer is calculated to be different from the initial temperature to determine the temperature increase of the magnetic layer relative to the initial temperature, and the difference is compared with the temperature difference threshold. If the difference between the temperature of the magnetic layer and the initial temperature is greater than the temperature difference threshold, the temperature increase of the cooking utensil is too large, and it is determined that there is no water in the cooking utensil; if the difference between the temperature of the magnetic layer and the initial temperature is greater than the temperature difference threshold, the temperature increase of the cooking utensil is within a normal range, and it cannot be determined that there is no water in the cooking utensil.

[0062] In one embodiment, the temperature difference threshold may be a fixed value set in advance. For example, the temperature difference threshold may be set between 3 degrees Celsius and 300 degrees Celsius, such as 3 degrees Celsius, 10 degrees Celsius, 50 degrees Celsius, 100 degrees Celsius, 200 degrees Celsius, 250 degrees Celsius, and 300 degrees Celsius.

[0063] In another embodiment, the temperature difference threshold can be calculated based on the electromagnetic heating resonant frequency, the set power, and the actual heating power corresponding to the set power. Specifically, the temperature difference threshold can be calculated according to the following formula:

[0064]

[0065] Among them, Tsth is the temperature difference threshold, P0 is the set power, P is the actual heating power corresponding to the set power, Tc is the electromagnetic heating resonant frequency, and A and B are empirical parameters.

[0066] See also Fig. 9 , Fig. 91 is a schematic flow chart of an embodiment of calculating a temperature difference threshold value provided by the present application. Fig. 9 As shown, this embodiment includes the following steps:

[0067] S131, obtaining the electromagnetic heating resonant frequency, set power, and actual heating power corresponding to the set power of the cooking appliance during the heating process.

[0068] The electromagnetic heating resonant frequency and the actual heating power may be determined by the method described in the above cooking device embodiment, which will not be described in detail.

[0069] S132, obtaining a corrected resonant frequency according to the electromagnetic heating resonant frequency, the set power, and the actual heating power corresponding to the set power.

[0070] In some embodiments, the corrected resonant frequency may be obtained using the following formula:

[0071]

[0072] Wherein, Tp represents the corrected resonant frequency, P0 is the set power, P is the actual heating power corresponding to the set power, Tc is the electromagnetic heating resonant frequency, and C and D are empirical parameters.

[0073] S133, obtaining a temperature difference threshold by using the corrected resonant frequency.

[0074] In some embodiments, the temperature difference threshold value may be obtained by using the following formula: Tsth=E*Tp+F, thus obtaining the above formula (1); wherein Tsth is the temperature difference threshold value, and E and F are empirical parameters.

[0075] For example, Tsth=E*Tp+F may be Tsth=-0.029*Tp+880.

[0076] In the case where the cooking device system has good stability, Tp=Tc can be directly set to reduce the complexity of the calculation frequency.

[0077] The above embodiment, when heating at a set power, obtains the temperature of the magnetic conductive layer at preset time intervals, and after subtracting the temperature of the magnetic conductive layer from the initial temperature, determines the relationship between the difference and the temperature difference threshold, thereby determining whether the cooking utensil is in a waterless dry-boiling state. Since the temperature of the cooking utensil rises very rapidly in the waterless dry-boiling state, the present embodiment can collect the temperature of the magnetic conductive layer at preset time intervals to monitor the temperature increase of the magnetic conductive layer in real time, and can provide timely feedback when the cooking utensil is waterless dry-boiling.

[0078] Furthermore, the temperature difference threshold can be determined by the electromagnetic heating resonant frequency, the set frequency and its corresponding actual heating power. The determination method is adaptive and less affected by the system error of the cooking device. The temperature difference threshold is more accurate, thereby improving the accuracy of the water-free detection result.

[0079] See also Fig.10 , Fig.10 FIG. 1 is a schematic flow chart of another embodiment of the method for detecting the absence of water in a cooking utensil provided by the present application. Fig.10 As shown, this embodiment includes the following steps:

[0080] S21, heating the cooking appliance at a set power.

[0081] S22, obtaining the temperature of the magnetic conductive layer at a preset time interval.

[0082] Steps S21-S22 have the same or similar technical solutions as those in the above embodiment and are not described in detail here.

[0083] S23: In response to the temperature of the magnetic conductive layer being greater than a first temperature threshold, determining that there is no water in the cooking appliance.

[0084] The first temperature threshold may be set between 50 degrees Celsius and 400 degrees Celsius, such as 50 degrees Celsius, 100 degrees Celsius, 150 degrees Celsius, 200 degrees Celsius, 250 degrees Celsius, 300 degrees Celsius, 350 degrees Celsius or 400 degrees Celsius.

[0085] In this step, the temperature of the magnetic layer is directly compared with the first temperature threshold to determine whether the temperature of the magnetic layer exceeds the limit during the heating period with the set power. If it exceeds the first temperature threshold, it is determined whether the temperature of the magnetic layer exceeds the limit and there is no water in the cooking utensil. This embodiment is simple to calculate and has a faster water-free detection, and can quickly feedback when the cooking utensil is dry-burned without water.

[0086] The methods for detecting that there is no water in the cooking utensil in the above-mentioned embodiments can be combined. For example, after obtaining the temperature of the magnetic layer at a preset time interval, the temperature of the magnetic layer collected can be compared with the temperature difference threshold after the difference between the temperature of the magnetic layer and the initial temperature is made, and the temperature of the magnetic layer can be compared with the first temperature threshold. As long as the difference between the temperature of the magnetic layer and the initial temperature is greater than the temperature difference threshold or the temperature of the magnetic layer is greater than the first temperature threshold, it can be determined that there is no water in the cooking utensil, which is more sensitive. Alternatively, when the difference between the temperature of the magnetic layer and the initial temperature is greater than the temperature difference threshold and the temperature of the magnetic layer is greater than the first temperature threshold, it can be determined that there is no water in the cooking utensil, which is more accurate and reduces false detection. In addition, the above-mentioned steps S11-S13 and steps S21-S23 can be used to perform water-free detection respectively at different heating power stages, so that the water-free detection can be performed using a detection method more suitable for the stage at different heating power stages to improve accuracy.

[0087] Optionally, after determining that there is no water in the cooking utensil, the above embodiments control the cooking device to stop heating and send out an alarm signal. The alarm signal may be sent out through a flashing light, buzzer or voice prompt module provided on the cooking device or cooking utensil, or may be sent out through a smart device wirelessly connected to the cooking device or cooking utensil. The alarm signal sent out through the voice prompt module may include water-free information and prompt information for the next operation, such as "There is no water in the pot, please pay attention to add" or "There is no water in the pot, please disconnect the power supply". In addition, other alarm prompt modes may be selected, which will not be described one by one here.

[0088] See also Fig.11 , Fig.11 1 is a schematic diagram of a computer readable storage medium according to an embodiment of the present application. The computer readable storage medium 70 stores a computer program 71, which is used to implement the following method when executed by a processor:

[0089] The cooking utensil is heated at a set power; the temperature of the magnetic conductive layer is acquired at a preset time interval, the temperature of the magnetic conductive layer at least including an initial temperature; in response to a difference between the temperature of the magnetic conductive layer and the initial temperature being greater than a temperature difference threshold, it is determined that there is no water in the cooking utensil.

[0090] It can be understood that when the computer program 71 is executed by the processor, it is also used to implement the method provided by any of the above-mentioned implementations, which will not be repeated here.

[0091] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation described above is only illustrative, for example, the division of the modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0092] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0093] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0094] If the integrated units in the above other embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk and other media that can store program codes.

[0095] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A cooking device, It is characterized in that The cooking device comprises: The heating unit comprises a first coil, and is used to heat the cooking utensil at a set power; wherein a magnetic conductive layer is provided at the bottom of the cooking utensil; A temperature detection unit, used to obtain the temperature of the magnetic conductive layer; a processing unit connected to the heating unit and the temperature detection unit, and configured to obtain the temperature of the magnetic conductive layer at a preset time interval, wherein the temperature of the magnetic conductive layer at least includes an initial temperature; and in response to a difference between the temperature of the magnetic conductive layer and the initial temperature being greater than a temperature difference threshold, determine that there is no water in the cooking utensil; The temperature detection unit comprises: A second coil is arranged corresponding to the center of the first coil and is used to sense the change of the magnetic permeability of the magnetic conductive layer; a third coil, wherein a first end of the third coil is connected to a first end of the second coil, and a second end of the second coil and a second end of the third coil are connected to the processing unit; wherein the first end of the third coil and the first end of the second coil are the same end; a fourth coil, two ends of which are connected to the processing unit; wherein the third coil and the fourth coil are sleeved on the lead-out wire of the first coil; The processing unit is used to obtain a first voltage between the second end of the second coil and the second end of the third coil, and a second voltage across the fourth coil, and determine the temperature of the magnetic conductive layer according to the first voltage and the second voltage; The heating unit further comprises a transistor; The processing unit is further used to obtain the driving frequency of the transistor, or the flipping frequency of the voltage across the first coil, so as to determine the electromagnetic heating resonant frequency according to the driving frequency or the flipping frequency; The processing unit is further used to calculate the temperature difference threshold according to the electromagnetic heating resonant frequency, the set power and the actual heating power.

2. The cooking device according to claim 1, It is characterized in that The processing unit is further used to obtain the voltage and current of the heating unit to determine the actual heating power according to the voltage and current.

3. The cooking device according to claim 1, It is characterized in that The processing unit is further configured to calculate the temperature difference threshold according to the following formula: in, is the temperature difference threshold, is the actual heating power, For the set power, is the electromagnetic heating resonant frequency, is an empirical parameter.

4. The cooking device according to claim 1, It is characterized in that The processing unit is further configured to determine that there is no water in the cooking utensil in response to the temperature of the magnetic conductive layer being greater than a first temperature threshold.

5. The cooking device according to any one of claims 1 to 4, It is characterized in that The processing unit is further used to control the heating unit to stop heating and send out an alarm signal after determining that there is no water in the cooking appliance.

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