Cooker, control method and control device for preventing dry burning thereof

Abstract

The present application relates to the field of smart home appliances and discloses a stove. The stove includes a contact portion, a temperature detection device, and a capacitance detection device. The temperature detection device is disposed on the contact portion and is configured to detect the temperature of a pot placed on the contact portion. The capacitance detection device is disposed on the contact portion and is configured to contact the pot placed on the contact portion. By providing the contact portion, the temperature detection device, and the capacitance detection device on the stove, the current cooking state is determined based on the temperature information of the pot. In a waterless cooking state, the anti-dry-burn temperature at which the stove stops heating is determined based on the material of the pot. This achieves precise dry-burn prevention for pots of different materials in a waterless cooking state, effectively reducing the false alarm rate for dry-burn prevention. The present application also discloses a control method and control device for stove dry-burn prevention.

Description

Technical Field

[0001] The present application relates to the technical field of smart home appliances, for example, to a stove, and a control method and control device for preventing dry burning thereof. Background Art

[0002] Dry-boiling refers to the prolonged heating of an empty pot, which can dry out or burn the contents. It's a common kitchen safety hazard, causing discoloration and deformation, and in severe cases, fire. Currently, dry-boiling protection is common in household stoves. This feature automatically shuts off the stove when the pot reaches a set threshold, providing protection against dry-boiling and protecting the pot.

[0003] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0004] In the related art, by comparing with the pre-set temperature information, when the temperature information of the bottom of the pot meets the set conditions, the current cooking status of the pot is judged, and different dry-burning thresholds are set according to different cooking states. This type of judgment method may lead to misjudgment when performing anti-dry-burning control on some pots, and the anti-dry-burning effect is limited. Summary of the Invention

[0005] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0006] The embodiments of the present disclosure provide a cooker, a method and a device for preventing dry burning thereof, so as to solve the technical problems in the related art of large errors and limited dry burning prevention effect when the cooker is prevented from dry burning only by temperature information.

[0007] In some embodiments, the stove includes a contact portion and further includes: a temperature detection device, disposed on the contact portion and configured to detect the temperature of the pot placed on the contact portion; and a capacitance detection device, disposed on the contact portion and configured to contact the pot placed on the contact portion.

[0008] In some embodiments, the control method for preventing dry burning of a stove includes: detecting the temperature information of the pot; when the temperature information of the pot meets a first condition, obtaining the capacitance value detected by a capacitance detection device; determining the material of the pot based on the capacitance value, and performing an anti-dry burning operation corresponding to the material of the pot.

[0009] In some embodiments, the control device for preventing dry burning of a stove includes a processor and a memory storing program instructions, and the processor is configured to execute the above-mentioned control method for preventing dry burning of a stove when executing the program instructions.

[0010] The stove, control method and control device for preventing dry burning of the stove provided by the embodiments of the present disclosure can achieve the following technical effects:

[0011] By providing a contact portion, a temperature detection device, and a capacitance detection device on the stove to detect the temperature of the pot placed on the stove and / or the change in capacitance, the current cooking state is determined based on the pot's temperature information. In waterless cooking, the anti-dry-burn temperature at which the stove stops heating is determined based on the pot's material. When the pot's temperature exceeds the anti-dry-burn temperature, the stove stops heating to prevent dry-burning. Because different pots have different anti-dry-burn temperatures, this allows for precise dry-burn prevention of pots of different materials during waterless cooking, effectively reducing the false alarm rate for dry-burn prevention.

[0012] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are considered similar elements. The drawings do not constitute a scale limitation. In addition,

[0014] Figure 1 is a schematic diagram of a cooker provided in an embodiment of the present disclosure;

[0015] Figure 2 is a schematic diagram of a control method for preventing dry burning of a stove provided by an embodiment of the present disclosure;

[0016] Figure 3 is a schematic diagram of a control method for preventing dry burning of a stove provided by an embodiment of the present disclosure;

[0017] Figure 4 is a structural diagram of an oscillation circuit provided by an embodiment of the present disclosure;

[0018] Figure 5 Schematic diagram of a control device for preventing dry burning of a stove provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0019] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0020] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0021] Unless otherwise stated, the term "plurality" means two or more.

[0022] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0023] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0024] Figure 1 This is a schematic diagram of the structure of a stove provided by an embodiment of the present disclosure. Figure 1 As shown, the cooker includes a contact portion 1, a temperature detection device 2, and a capacitance detection device 3. The contact portion 1 is used to support and contact the pot placed on the cooker, the temperature detection device 2 is used to detect the temperature of the pot placed on the contact portion 1 during the cooking process, and the capacitance detection device 3 contacts the pot placed on the contact portion 1 to detect the capacitance value.

[0025] The contact portion 1 can be a component in the stove structure that contacts the pot, such as a burner, a fire cover, etc., or it can be a component detachably connected to the stove, such as a stove rack, a pot rack, a pot rack support, etc.

[0026] The temperature detection device 2 can be a device that can detect temperature, such as a temperature sensor, a negative temperature coefficient (NTC) thermistor, or a temperature probe. It is installed on the contact portion 1 through a connector to detect the temperature of the pot placed on the contact portion 1. Generally, when a stove is used to heat a pot, the temperature information of the pot may include the temperature of the bottom of the pot, its heating rate based on the relationship between temperature and time, and the rate of change of the heating rate. Based on the temperature information of the pot, information such as the cooking status and cooking stage of the pot can be obtained, which can be used to provide an anti-dry-burn warning. Optionally, the number of temperature detection devices 2 is one or more.

[0027] The capacitance detection device 3 can be a capacitance detector, a capacitance sensor, etc., and is mounted on the contact portion 1 via a connector to measure capacitance changes during contact between the cookware and the contact portion 1 .

[0028] Optionally, the capacitance detection device 3 includes an electrode plate and a capacitance detection circuit. The electrode plate includes an upper electrode plate and a lower electrode plate, the upper electrode plate being in contact with the cookware; and the capacitance detection circuit is configured to detect the capacitance value of a capacitor formed by the upper and lower electrode plates and / or the capacitance value of a capacitor formed by the lower electrode plate and the cookware.

[0029] Here, the upper electrode plate and the lower electrode plate are arranged in parallel to form a parallel plate capacitor. The capacitance value of the parallel plate capacitor is obtained as follows:

[0030]

[0031] Where C is the capacitance of the parallel plate capacitor, ε is the dielectric constant (relative permittivity), k is the electrostatic force constant, S is the area of ​​the two plates facing each other, and d is the vertical distance between the two plates.

[0032] According to formula (1), when the vertical distance d between the two plates is constant, the capacitance C of the parallel plate capacitor is positively correlated with the area S facing the two plates. Specifically, in this embodiment, when the pot is not placed on the contact portion 1, the capacitor is formed by the upper electrode plate and the lower electrode plate, which are parallel to each other, and the area of ​​the original upper electrode plate is smaller than that of the lower electrode plate. When the pot is placed on the contact portion 1, the upper electrode plate contacts the pot. In the case where the pot is made of metal, the pot and the original upper electrode plate together form the upper electrode plate of the capacitor. Since the projected area of ​​the pot on the lower electrode plate increases, the area facing the upper electrode plate and the lower electrode plate increases. According to formula (1), the capacitance value changes. In the case where the pot is made of non-metallic material, since the pot and the upper electrode plate do not form a path after contact, the capacitance value does not change.

[0033] The stove provided by the disclosed embodiments utilizes a contact portion 1, a temperature detection device 2, and a capacitance detection device 3 to detect the temperature of a pot placed on the stove and / or changes in capacitance to determine a dry-boil prevention temperature at which the stove stops heating. When the pot's temperature exceeds the dry-boil prevention temperature, the stove stops heating to prevent dry-boil problems. Because different pots have different dry-boil prevention temperatures, precise dry-boil prevention is achieved for pots of different materials, effectively reducing the false alarm rate for dry-boil prevention.

[0034] Figure 2 This is a flow chart of a control method for preventing dry burning of a stove provided by an embodiment of the present disclosure. Figure 1 The cooktop shown, combined with Figure 2 As shown, the control method for preventing dry burning of a stove includes:

[0035] Step S01: detecting the temperature information of the cookware.

[0036] Generally, when a cooker is used to heat a pot, the pot's temperature information may include the pot bottom temperature, its rate of temperature increase based on the relationship between temperature and time, and the rate of change of the temperature increase rate. The temperature parameter can be obtained by a temperature detection device located on the cooktop or pot bottom, while the time parameter can be obtained by a timer located on the cooker or pot. In this embodiment, the pot's temperature information is obtained by a temperature detection device located on the contact portion.

[0037] Step S02: When the temperature information of the cookware satisfies a first condition, obtaining a capacitance value detected by a capacitance detection device.

[0038] Here, the first condition represents a control condition related to the cookware's cooking state. When the cookware's temperature satisfies the control condition, the system determines that the cookware is in a waterless cooking state. This allows for different anti-dry-cooking thresholds based on the cookware's material to prevent dry-cooking. Because different cookware materials have different anti-dry-cooking thresholds, this allows for precise dry-cooking prevention based on the cookware's material information for different cooking states. This simplifies the determination process and effectively reduces the false positive rate for dry-cooking prevention.

[0039] Step S03: determining the material of the cookware according to the capacitance value, and performing an anti-dry-boiling operation corresponding to the material of the cookware.

[0040] Because the electrode plates that make up a capacitor need to store and release charge during operation, they must be conductive. When the cookware is made of metal, the cookware and the original upper electrode plate together form the upper electrode plate of the capacitor, and the capacitance value of the capacitor formed by the cookware and the electrode plate is greater than that formed by the original upper and lower electrode plates. When the cookware is made of non-metallic materials, the cookware does not meet the conductive conditions of the electrode plate and therefore does not form a capacitor together with the electrode plate, nor does it change the capacitance value. Therefore, the change in capacitance value can be used to determine whether the cookware is made of metal or non-metallic material.

[0041] The control method for preventing dry burns on stoves, provided in the embodiments of the present disclosure, detects the temperature of the pot. For pots whose temperature information meets preset conditions, capacitance detection is performed to determine their material, and different dry burn prevention temperatures are set based on the material. When the pot's temperature exceeds the dry burn prevention temperature, the stove is controlled to stop heating to prevent dry burns. Because different pots have different dry burn prevention temperatures, precise dry burn prevention is achieved for pots of different materials, effectively reducing the false positive rate of dry burn prevention.

[0042] Optionally, the first condition includes: the temperature change value of the cookware is greater than or equal to the boiling temperature range value. Here, the temperature change value refers to the temperature change value of the cookware within a set temperature acquisition period. The boiling temperature range value represents the maximum temperature change range threshold within which the cookware can maintain optimal performance while boiling. Typically, the temperature change of a cookware within a set time period while boiling is small.

[0043] Optionally, the boiling temperature range value is determined according to the cooking appliance's heating power. The heating power level of the cooking appliance can also be obtained through a heating power detection sensor. The heating power detection sensor can be a rotatable potentiometer installed on the knob column of the cooking appliance switch. By sensing the changes in the resistance, voltage, or current of the potentiometer, the heating power adjustment level of the cooking appliance is obtained, and further the size of the cooking appliance's heating power is judged. In another embodiment, the heating power detection sensor can also be a gas flow rate sensing device installed on the gas pipeline, and the size of the cooking appliance's heating power is judged by sensing the flow rate of the gas. In yet another embodiment, the heating power detection sensor can be a gas pressure sensing device installed on the gas pipeline, and the size of the cooking appliance's heating power is judged by sensing the pressure of the gas. Of course, the cooking appliance can also be an induction cooker. At this time, the heating power of the induction cooker can be judged by detecting the magnitude of the current supplied to the coil or the heating power level; the heating power can be divided into multiple levels, such as level 1, level 2, level 3, level 4, and level 5, etc. In one embodiment, the heating power is divided into 3 levels. Level 1 is low heat, level 2 is medium heat, and level 3 is high heat. The first preset heating power is P1 and the second preset heating power is P2. For example, when the detected heating power P < P1, it is judged that the current heating power level is low heat; when the detected heating power P1 ≤ P ≤ P2, it is judged that the current heating power level is medium heat; when the detected heating power P > P2, it is judged that the current heating power level is high heat.

[0044] In the embodiments of the present disclosure, the current heating power level is represented by the opening degree of the gas valve. The larger the numerical value of the opening degree of the gas valve, the smaller the current valve opening degree, and the smaller the gas flow rate. Therefore, when the opening degree numerical value of the gas valve is larger, the current heating power level is lower; when the opening degree numerical value of the gas valve is smaller, the current heating power level is higher. In this case, according to the corresponding relationship between the heating power and the boiling temperature range value, the boiling temperature value range corresponding to the current heating power can be determined. Here, there is a proportional linear change relationship between the boiling temperature range value and the heating power. The higher the heating power of the cooking appliance, the larger the corresponding boiling temperature range value.

[0045] Optionally, when the temperature of the cookware is within the first temperature range, the temperature change value of the cookware is obtained. Here, the first temperature range is determined according to the cooking appliance's heating power. Within this first temperature range, the cookware is in a high-temperature state and can maintain a good working state. Optionally, the lower limit value of this first temperature range is B min , and the upper limit value of this first temperature range is B max . The lower limit value B min of the first temperature range and the upper limit value B maxThe time interval is determined based on the stove's power and is positively correlated with the stove's power. When the pot bottom temperature is within this first temperature range, the pot has already begun heating and cooking, and there's no danger of a dry boil. At this point, the anti-dry boil feature is activated, and temperature information is acquired. Compared to continuously monitoring the pot temperature over time, this approach can shorten data acquisition time, reduce redundant data, and reduce the storage space required. Optionally, after cooking begins, the pot temperature can be periodically monitored at set intervals to determine whether to activate the anti-dry boil feature and acquire the pot's temperature change.

[0046] Optionally, the temperature change value of the cookware includes multiple temperature change values ​​corresponding to multiple time intervals within a set time period. The multiple temperature change values ​​corresponding to the multiple time intervals are obtained to determine the cooking state.

[0047] Optionally, the time interval for collecting the temperature change value is negatively correlated with the firepower of the stove. Optionally, when the energy of the stove changes, the length of the time interval for collecting the temperature change value is updated according to the changed firepower.

[0048] Optionally, after the temperature change value is obtained, when the pot temperature is lower than the lower limit value B of the first temperature range, min In the case of the most recent temperature value, the lower limit value B of the first temperature interval is updated according to the most recently collected temperature value. min At the same time, considering that the reason for the temperature drop may be that new ingredients are added during the cooking process, such as water, vegetables, etc., when the base temperature is less than the lower limit value B of the first temperature range, min When the temperature is collected, all collected data will be cleared and temperature collection will be restarted.

[0049] Alternatively, if the cookware's temperature information does not meet the first condition, it indicates that the cookware does not comply with the anti-dry-boil strategy determined based on the first condition, and a corresponding anti-dry-boil strategy may be implemented based on other attribute information of the cookware. Alternatively, the current cooking state may be determined based on the cookware's heating rate and the rate of change of the heating rate, so as to implement a corresponding anti-dry-boil strategy.

[0050] Optionally, determining the material of the cookware based on the capacitance value includes: obtaining a capacitance difference between the capacitance value and the initial capacitance value; when the capacitance difference is greater than or equal to a preset capacitance difference, determining that the material of the cookware is a metal material; and / or, when the capacitance difference is less than a preset capacitance difference, determining that the material of the cookware is a non-metallic material.

[0051] Here, those skilled in the art can determine the preset capacitance difference based on previous experimental data so that the preset capacitance difference can accurately reflect the change in capacitance value brought about by the metal cookware based on the initial capacitance value, thereby making the judgment result of the cookware material more accurate.

[0052] Because the electrode plates that make up a capacitor need to store and release charge during operation, they must be conductive. When the cookware is made of metal, the cookware and the original upper electrode plate together form the upper electrode plate of the capacitor, and the capacitance value of the capacitor formed by the cookware and the electrode plate is greater than that formed by the original upper and lower electrode plates. When the cookware is made of non-metallic materials, the cookware does not meet the conductive conditions of the electrode plate and therefore does not form a capacitor together with the electrode plate, nor does it change the capacitance value. Therefore, the change in capacitance value can be used to determine whether the cookware is made of metal or non-metallic material.

[0053] When the capacitance difference is greater than or equal to the preset capacitance difference, it indicates that the cookware and the original upper electrode plate together constitute the upper electrode plate of the capacitor, and relative to the capacitance formed by the original upper electrode plate and the lower electrode plate, the capacitance value of the capacitor formed by the cookware and the electrode plate is significantly increased, thus determining that the material of the cookware is metal.

[0054] When the capacitance difference is less than the preset capacitance difference, it indicates that the cookware does not meet the conductive conditions of the electrode plate, and therefore does not form a capacitor together with the electrode plate, nor does it significantly change the capacitance value of the capacitor. Therefore, it is determined that the material of the cookware is non-metallic.

[0055] Compared with judging the material of the pot based on conductivity or temperature change curves, judging the material based on changes in capacitance values ​​is more accurate. It can avoid material misjudgment caused by long-term use or the thickness or special properties of the pot, which may lead to misjudgment when executing the anti-dry burning strategy.

[0056] Optionally, an anti-dry-burn operation corresponding to the material of the cookware is performed, including: obtaining the bottom temperature of the cookware and the anti-dry-burn temperature corresponding to the material of the cookware; when the bottom temperature is greater than or equal to the anti-dry-burn temperature, reducing the firepower.

[0057] When the cookware is made of metal, the anti-dry boil temperature is set to the first set value; when the cookware is made of non-metallic material, the anti-dry boil temperature is set to the second set value, where the first set value is less than the second set value. Thus, when the anti-dry boil temperature is determined based on the cookware material, only dry boil prevention is implemented for that specific cookware material; cookware of other materials can be set to the default threshold for dry boil prevention.

[0058] Optionally, when the cookware is made of metal, the anti-dry boil temperature is a first set value; and when the cookware is made of non-metallic material, the anti-dry boil temperature is a second set value; wherein the first set value is less than the second set value. In this way, when determining the threshold based on the material of the cookware, it is possible to set the anti-dry boil threshold for metal and non-metallic cookware, and set a default threshold for anti-dry boil for cookware made of other materials.

[0059] Here, the first set value represents the maximum temperature threshold within the temperature range in which metal cookware can maintain optimal performance during cooking; the second set value represents the maximum temperature threshold within the temperature range in which non-metallic cookware can maintain optimal performance during cooking. The cookware material is determined based on the capacitance change to determine the threshold value that meets the requirements for the cookware.

[0060] Optionally, the above-mentioned control method for preventing dry burning of a stove further includes: controlling the stove to stop heating when the temperature of the pot reaches a third set value. The third set value is used to express the temperature at which some or all materials of the pot are at risk of dry burning. When the pot reaches this temperature, continuing to heat it may cause the pot to dry burn or even explode. Optionally, the third set value is greater than the above-mentioned second set value; optionally, the third set value is assigned a value of 500 degrees. When the temperature of the pot is greater than 500 degrees, the stove is controlled to stop heating, which can prevent the pot from dry burning. In this way, when the anti-dry burning temperature cannot be set according to the material of the pot, anti-dry burning protection for the pot is achieved by setting the third set value.

[0061] The control method for preventing dry burns on stoves, provided in the embodiments of the present disclosure, detects the temperature of the pot. For pots whose temperature information meets preset conditions, capacitance detection is performed to determine their material, and different dry burn prevention temperatures are set based on the material. When the pot's temperature exceeds the dry burn prevention temperature, the stove is controlled to stop heating to prevent dry burns. Because different pots have different dry burn prevention temperatures, precise dry burn prevention is achieved for pots of different materials, effectively reducing the false positive rate of dry burn prevention.

[0062] like Figure 3 As shown, the embodiment of the present disclosure provides a control method for preventing dry burning of a stove, comprising:

[0063] Step S11, detecting the temperature information of the cookware.

[0064] Step S12: When the temperature information of the cookware satisfies the first condition, the oscillation frequency of the oscillation circuit in which the capacitor is located is obtained.

[0065] An oscillator circuit is a circuit that automatically converts direct current (DC) power into an alternating current (AC) signal with a certain amplitude and frequency without the need for an external signal. The oscillator circuit includes an amplifier, a positive feedback circuit, and a frequency-selective network. The amplifier amplifies the input signal applied to the oscillator circuit's output terminal to maintain a constant value; the positive feedback circuit ensures that the feedback signal provided to the oscillator circuit's input terminal is phase-matched; and the frequency-selective network only allows a specific frequency, f0, to pass through, allowing the oscillator circuit to produce a single-frequency output. The disclosed embodiment obtains the oscillation frequency of the oscillator circuit and indirectly calculates the capacitance value of the capacitor, resulting in a simpler and more flexible acquisition method.

[0066] Optionally, obtaining the oscillation frequency of the oscillation circuit in which the capacitor is located includes: obtaining multiple oscillation frequencies detected within a preset time period; performing data processing on the multiple oscillation frequencies to obtain a processed oscillation frequency; and using the processed oscillation frequency as the oscillation frequency. The preset time period is a preset period before the current moment (for example, the previous 3 minutes). When there are other objects on the electrode plate, the oscillation frequency of the oscillation circuit will be affected (for example, food debris falls on the lower electrode plate). In order to reduce the impact of accidental events on the collected oscillation frequency, multiple oscillation frequencies are collected within a preset time period, and data processing is performed on the multiple oscillation frequencies to obtain a final oscillation frequency, thereby reducing the randomness of the oscillation frequency change and improving the accuracy of the oscillation frequency.

[0067] Optionally, performing data processing on the plurality of oscillation frequencies to obtain a processed oscillation frequency includes:

[0068]

[0069] in, is the processed oscillation frequency, n is the number of oscillation frequencies detected within the preset time period, f n is the nth oscillation frequency detected within the preset time period, α n f n The weighting coefficient of α1+…+α n =1.

[0070] In this way, a weighted average processing is performed on multiple oscillation frequencies detected within a preset time period to obtain a weighted average oscillation frequency (processed oscillation frequency), and the weighted average oscillation frequency is used as the final oscillation frequency of the oscillation circuit, which can reduce the influence of accidental factors and improve the accuracy of the oscillation frequency acquisition method of the oscillation circuit.

[0071] Optionally, α n It is positively correlated with n, that is, as the value of n increases, α nFor example, when n=5, α1=0.1, α2=0.15, α3=0.2, α4=0.25, and α5=0.3.

[0072] α n is the nth oscillation frequency f detected within the preset time period n The weighting coefficient, α n Positively correlated with n, indicating that f n The closer the detection time is to the current time, the larger the weighting coefficient is. In this way, the weighted average oscillation frequency can better represent the oscillation frequency of the oscillation circuit at the current time.

[0073] Optionally, performing data processing on the multiple oscillation frequencies to obtain a processed oscillation frequency includes: obtaining an average oscillation frequency of the multiple oscillation frequencies; calculating an oscillation frequency difference between the multiple oscillation frequencies and the average oscillation frequency; and selecting the oscillation frequency with the smallest oscillation frequency difference among the multiple oscillation frequencies as the processed oscillation frequency. This can reduce the influence of accidental factors and improve the accuracy of the oscillation frequency acquisition method of the oscillation circuit.

[0074] Step S13: Calculate the capacitance value according to the oscillation frequency.

[0075] In the embodiment of the present disclosure, an LC oscillation circuit is used to obtain the oscillation frequency, that is, the frequency selection network of the oscillation circuit is composed of an inductor L and a capacitor C. Figure 4 As shown, the oscillation circuit includes a peripheral drive circuit (including an amplifier and a positive feedback circuit), an inductor L, a capacitor C and an electrode plate S0 connected in sequence, wherein: the inductor L and the capacitor C are respectively connected in parallel with the peripheral drive circuit; one end of the electrode plate S0 is connected to the peripheral drive circuit, and the other end is grounded.

[0076] Optionally, the capacitance value is calculated based on the oscillation frequency, including:

[0077]

[0078] Among them, C0 is the capacitance value of the capacitor formed by the cookware and the electrode plate, L is the inductance value of the inductor L in the oscillation circuit, and f is the oscillation frequency.

[0079] The LC oscillator circuit has a wide oscillation frequency range and is easy to start oscillating. When the capacitance value of the capacitor formed by the cookware and the electrode plate changes, the oscillation frequency f will also change significantly accordingly, making the detection result more accurate, and thus making the capacitance value calculated by the oscillation frequency according to Formula 3 more accurate.

[0080] Step S14, obtaining a capacitance difference between the capacitance value and the initial capacitance value; when the capacitance difference is greater than or equal to a preset capacitance difference, determining that the material of the cookware is a metal material; and / or, when the capacitance difference is less than the preset capacitance difference, determining that the material of the cookware is a non-metallic material.

[0081] Step S15, obtaining the bottom temperature of the pot and the anti-dry-burn temperature corresponding to the material of the pot; when the bottom temperature of the pot is greater than or equal to the anti-dry-burn temperature, reducing the firepower; when the bottom temperature of the pot is less than the anti-dry-burn temperature, continuing to maintain the original firepower operation and perform normal cooking work.

[0082] The control method for preventing dry burns on stoves, provided in the embodiments of the present disclosure, detects the temperature of the pot. For pots whose temperature information meets preset conditions, capacitance detection is performed to determine their material, and different dry burn prevention temperatures are set based on the material. When the pot's temperature exceeds the dry burn prevention temperature, the stove is controlled to stop heating to prevent dry burns. Because different pots have different dry burn prevention temperatures, precise dry burn prevention is achieved for pots of different materials, effectively reducing the false positive rate of dry burn prevention.

[0083] Combine Figure 5 As shown, an embodiment of the present disclosure provides a control device for preventing dry burning of a stove, comprising a processor 100 and a memory 101. Optionally, the device may further comprise a communication interface 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transmission. The processor 100 may call the logic instructions in the memory 101 to execute the control method for preventing dry burning of a stove according to the above embodiment.

[0084] In addition, the logic instructions in the memory 101 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0085] Memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. Processor 100 executes the program instructions / modules stored in memory 101 to execute functional applications and process data, thereby implementing the control method for preventing dry cooking in the cooktop described in the above-mentioned embodiments.

[0086] The memory 101 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and non-volatile memory.

[0087] The disclosed embodiments provide a stove comprising the aforementioned control device for preventing dry burning. Optionally, the stove may be an induction cooker or a gas stove. By providing the control device for preventing dry burning, the stove can be controlled to prevent the pot from dry burning by determining a dry burning prevention strategy based on the temperature information and capacitance value of the pot placed on the stove for cooking. This effectively improves the safety of the stove and reduces the false positive rate of dry burning prevention.

[0088] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned control method for preventing dry burning of a stove.

[0089] An embodiment of the present disclosure provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the above-mentioned control method for preventing dry burning of a stove.

[0090] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0091] The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method of the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program code, or a transient storage medium.

[0092] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variations "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups of these. In the absence of further restrictions, an element defined by the sentence "comprising a..." does not exclude the presence of other identical elements in the process, method or device that includes the element. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments can be referenced to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can be found in the description of the method part.

[0093] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technicians will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0094] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical functional division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, and can be electrical, mechanical or other forms. 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 they may be distributed on multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of the present disclosure may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0095] The flowcharts and block diagrams in the accompanying drawings show the possible implementation architectures, functions and operations of the systems, methods and computer program products according to the embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of the code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical functions. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in an order different from that disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified function or action, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for preventing dry burning of a stove, characterized in that: The cooker comprises: Contact Department: a temperature detection device, disposed on the contact portion and configured to detect the temperature of the pot placed on the contact portion; a capacitance detection device, disposed on the contact portion and configured to contact a cookware placed on the contact portion; An electrode plate, comprising an upper electrode plate and a lower electrode plate arranged in parallel, wherein the upper electrode plate contacts the cookware and has an area smaller than that of the lower electrode plate; a capacitance detection circuit, configured to detect the capacitance value of a capacitor formed by the upper electrode plate and the lower electrode plate, and / or to detect the capacitance value of a capacitor formed by the lower electrode plate and the cookware; The control method includes: Detect the temperature information of the pot; When the temperature information of the cookware satisfies a first condition, obtaining a capacitance value detected by a capacitance detection device; the capacitance value is obtained based on the oscillation frequency of an oscillation circuit in which the capacitor is located; the first condition includes that the temperature variation value of the cookware is greater than or equal to a boiling temperature range value; the boiling temperature range value is used to represent a maximum temperature variation range threshold value within which the cookware can maintain a good usable state when in a boiling state; Obtaining a capacitance difference between the capacitance value and an initial capacitance value; If the capacitance difference is greater than or equal to a preset capacitance difference, determining that the material of the cookware is a metal material; and / or if the capacitance difference is less than a preset capacitance difference, determining that the material of the cookware is a non-metal material; Obtaining the bottom temperature of the cookware and the anti-dry-burning temperature corresponding to the material of the cookware; When the temperature of the pot bottom is greater than or equal to the anti-dry burning temperature, reduce the fire power.

2. The method according to claim 1, characterized in that The temperature change value of the cookware includes multiple temperature change values ​​corresponding to multiple time intervals within a set time period.

3. The method according to claim 1, characterized in that The boiling temperature range is determined according to the firepower of the stove.

4. The method according to claim 3, characterized in that The higher the firepower of the stove is, the larger the boiling temperature range is.

5. A control device for preventing dry burning of a stove, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the control method for preventing dry burning of a cooker according to any one of claims 1 to 4 when executing the program instructions.

Images