CN113747619B - Control method and control device for cooking appliance, cooking appliance and storage medium - Google Patents

Control method and control device for cooking appliance, cooking appliance and storage medium Download PDF

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Publication number
CN113747619B
CN113747619B CN202010472950.XA CN202010472950A CN113747619B CN 113747619 B CN113747619 B CN 113747619B CN 202010472950 A CN202010472950 A CN 202010472950A CN 113747619 B CN113747619 B CN 113747619B
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China
Prior art keywords
resonance period
cooking appliance
period value
heating coil
value
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CN202010472950.XA
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CN113747619A (en
Inventor
江德勇
郑量
黄庶锋
任祥喜
王云峰
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Priority to CN202010472950.XA priority Critical patent/CN113747619B/en
Publication of CN113747619A publication Critical patent/CN113747619A/en
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/24—Warming devices
    • A47J36/2483—Warming devices with electrical heating means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Cookers (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

The invention provides a control method and device of a cooking appliance, the cooking appliance and a storage medium. The control method of the cooking appliance comprises the steps of: acquiring a first resonance period value of the heating coil, and determining the change rate of the resonance period value in a first set time length; according to the technical scheme provided by the invention, in the working process of the heating coil, the resonance period value of the heating coil and the variation of the resonance period value are calculated in real time, whether water in the cooker is boiled or not is judged according to the resonance period value of the heating coil and the variation of the resonance period value, the working of the heating coil is further controlled, the heating coil is rapidly controlled to stop working, further the water on can be timely judged, delayed shutdown or early shutdown is avoided, and the use experience of a user is improved.

Description

Control method and control device for cooking appliance, cooking appliance and storage medium
Technical Field
The invention belongs to the technical field of cooking appliances, and particularly relates to a control method of a cooking appliance, a control device of the cooking appliance, the cooking appliance and a computer readable storage medium.
Background
In the related art, for a cooking appliance having IH (Induction Heating, electromagnetic heating), it heats food by an electromagnetic heating means. In a conventional IH cooking appliance, such as an induction cooker, as shown in FIG. 1, a thermistor 30 is provided to obtain the temperature of the pot 10, so as to determine whether water in the pot is boiling. Because the thermistor is arranged below the heating panel 20, due to the heat conduction hysteresis of the heating panel 20, the temperature sampling of the thermistor 30 has certain hysteresis, the dry burning judgment is easy to be untimely, and the delayed shutdown or the early shutdown is caused because the water can not be timely judged, so that the user experience is very poor.
Disclosure of Invention
The present invention aims to solve one of the technical problems existing in the prior art or related technologies.
To this end, a first aspect of the present invention proposes a control method of a cooking appliance.
A second aspect of the present invention proposes a control device of a cooking appliance.
A third aspect of the present invention provides a cooking appliance.
A fourth aspect of the present invention proposes a computer-readable storage medium.
In view of this, according to a first aspect of the present invention, there is provided a control method of a cooking appliance including a heating coil, the control method including: acquiring a first resonance period value of the heating coil, and determining the change rate of the resonance period value in a first set time length; the operation of the heating coil is controlled according to the rate of change of the resonance period value.
The control method provided by the invention is used for the cooking appliance, and the cooking appliance comprises a heating coil, namely, the cooking appliance realizes heating of the cooker through electromagnetic induction generated between the heating coil and the cooker. In the heating process of the cooking utensil, the resonant period of the cooking utensil is collected, the change rate of the resonant period value in the first set duration is calculated, whether water in the cooker heated by the cooking utensil is boiled is judged according to the change rate of the resonant period value, and then the work of the heating coil is controlled. And when the water in the pot is judged to be boiling, the heating coil is controlled to stop working, and when the water in the pot is judged not to be boiling, the heating coil is controlled to continue working, so that the pot is heated.
In the working process of the heating coil, a coupling inductance is generated between the heating coil and the cooker. When the temperature of the cooker changes, the coupling inductance also changes, and the specific reaction is that the temperature of the cooker rises, and the coupling inductance also rises. When the coupling inductance increases, the resonance period value of the heating coil increases, and the change is immediate and there is little hysteresis. In the stage of boiling water, the temperature change of the cooker is obvious, the resonance period value of the heating coil can be changed greatly, and the change rate of the resonance period value can be reduced in the stage of boiling water. Therefore, whether the water in the cooker boils or not can be rapidly and accurately judged by detecting the resonance period value and the variation of the resonance period value of the heating coil in real time, and if the water is judged to be boiled, the heating coil is controlled to stop working. In the working process of the heating coil, the resonance period value of the heating coil and the variation of the resonance period value are calculated in real time, whether water in the cooker is boiled or not is judged according to the resonance period value of the heating coil and the variation of the resonance period value, then the working of the heating coil is controlled, the heating coil is rapidly controlled to stop working, then the water can be timely judged to be started, delayed shutdown or early shutdown is avoided, and the use experience of a user is improved.
It can be understood that whether the water in the cookware of the cooking utensil is boiled or not is judged by the resonance period value of the heating coil, and the cooking utensil is suitable for being used in the environment of the plateau area. In the plateau environment, the boiling point of water is relatively low, and if the detection is performed according to the temperature in the related art, it is easy to determine that the water is not boiled even if the water is boiled. However, the judgment is carried out by utilizing the change rate of the resonance period value, so that whether the water is in a boiling state can be accurately and easily judged.
In addition, according to the control method of the cooking utensil in the technical scheme provided by the invention, the control method can also have the following additional technical characteristics:
In the above technical solution, the step of acquiring the first resonance period value of the heating coil and determining the rate of change of the resonance period value specifically includes: determining a second resonance period value of the heating coil, and determining a first resonance period value of the heating coil after delaying for a first set period of time; and calculating a difference value between the second resonance period value and the first resonance period value, and determining the change rate of the resonance period value according to the ratio of the difference value to the first set duration.
In the technical scheme, an initial resonance period value of a heating coil is first obtained to be a second resonance period value, after a first set period is delayed, the resonance period value of the heating coil is obtained to be the first resonance period value, the first resonance period value is subtracted by the second resonance period value to obtain the variation of the resonance period in the first set period, and then the obtained variation of the resonance period in the first set period is divided by the first set period to obtain the resonance period variation rate in the first set period, so that the cooking utensil is controlled according to the obtained resonance period variation rate.
It is understood that the cooking appliance includes a control device and a switching tube. The switching tube comprises an IGBT (Insulated Gate Bipolar Transistor ), the control device outputs a PPG (Programme Pulse Generator, pulse program generator) signal to the switching tube driving device, the switching tube driving device synchronously outputs a gate pole (VG) signal to the gate pole of the IGBT, the IGBT is turned on at the moment, and when the VG signal returns to zero, the IGBT is turned off at the moment, and resonance starts. Therefore, in one working period of the switching tube, the width of a single pulse and one resonance period are included, and the resonance period value can be accurately determined according to the working period value of the switching tube and the pulse width of the pulse program generator signal, so that the accuracy of dry combustion judgment is improved. Thereby acquiring a first resonance period value and a second resonance period value of the heating coil.
In any of the above technical solutions, the step of controlling the operation of the heating coil according to the rate of change of the resonance period value specifically includes: determining that the cooking appliance is in a set working state according to the change rate of the resonance period; and (3) timing the duration of the cooking utensil in the set working state, and controlling the cooking utensil to stop working based on the duration of the cooking utensil in the set working state being greater than or equal to the second set duration.
According to the technical scheme, when the change rate of the resonance period meets the set condition, the cooking utensil can be judged to be in the set working state, the time length of the cooking utensil in the set working state is counted, when the time length reaches the second set time length, the water in the cooking utensil is judged to be in the boiling state, and the cooking utensil is controlled to stop working.
It can be understood that the set working state of the cooking appliance is that the resonance period change rate of the heating coil is small, i.e. the temperature of water in the cooker of the cooking appliance is relatively stable.
In any of the above technical solutions, the step of determining that the cooking appliance is in the set working state according to the rate of change of the resonance period specifically includes: and determining that the cooking appliance is in the set working state based on the fact that the first resonance period value is larger than the set resonance period value and the change rate of the resonance period is smaller than the set resonance period change rate.
In the technical scheme, the first resonance period value is larger than the set resonance period value, it can be determined that the detected temperature of the cooking appliance reaches the set temperature, and the resonance period change rate is smaller than the set resonance period change rate, so that the current resonance period value is judged to be in a stable state, the temperature change of the cooking appliance is smaller, after the second set period of time is continued, water in a pot of the cooking appliance is considered to be in a boiling state, and a heating coil in the cooking appliance is controlled to stop working. If the first resonance period value is smaller than the set resonance period value, judging that the temperature of the current cooking utensil does not reach the set temperature, judging that the resonance period change rate is larger than the set resonance period change rate, judging that the current resonance period value is in a continuous change state, and controlling the cooking utensil to continuously work normally to heat if the water temperature in the cooker of the cooking utensil is in a continuous rising state.
In any of the above technical solutions, the cooking appliance further includes a heating panel, and before the step of determining that the cooking appliance is in the set working state according to the rate of change of the resonance period, the cooking appliance further includes: and collecting the temperature value of the heating panel after the first set time.
In the technical scheme, before the step of judging whether water in a pot of the cooking utensil is boiled or not according to the change rate of the resonance period, the temperature value of the heating panel after the first set time period is collected. According to the temperature value of the heating panel, whether the water in the cooker of the cooking utensil reaches the temperature requirement can be determined. When the heating panel of the cooking utensil meets the temperature requirement, judging whether water in a cooker of the cooking utensil is boiled according to the resonance period change rate of a heating coil in the cooking utensil, and controlling a heating coil according to whether the water in the cooker of the cooking utensil is boiled.
In any of the above technical solutions, the step of determining that the cooking appliance is in the set working state according to the rate of change of the resonance period specifically includes: and determining that the cooking appliance is in the set working state based on the fact that the temperature value is larger than the set temperature value and the change rate of the resonance period is smaller than the change rate of the set resonance period.
In the technical scheme, when the detected temperature value of the heating panel is larger than the set temperature value and the change rate of the resonance period is smaller than the set resonance period change rate, the current resonance period value is judged to be in a stable state, the temperature change of the cooking appliance is smaller, the cooking appliance is determined to be in a set working state, after the second set duration is continued, water in the cooker of the cooking appliance is considered to be in a boiling state, and the heating coil in the cooking appliance is controlled to stop working. If the temperature of the heating panel is smaller than the set temperature value and the resonance period change rate is larger than the set resonance period change rate, the current resonance period value is judged to be in a continuous change state, and the water temperature in the cookware in the cooking utensil is determined to be in a continuous rising state, so that the cooking utensil is controlled to continue to normally work for heating.
According to a second aspect of the present invention, there is provided a control device of a cooking appliance, comprising: a memory; a processor, and a computer program stored on the memory and executable on the processor; the computer program when executed by the processor implements the control method of the cooking appliance according to any one of the above-described aspects. Therefore, the control method of the cooking appliance has all the beneficial effects of the control method of the cooking appliance in any one of the technical schemes.
According to a third aspect of the present invention there is provided a cooking appliance comprising: a heating coil; the synchronous detection circuit is connected with the heating coil and is configured to acquire the resonance period of the heating coil; the control device of the cooking appliance in the technical scheme is connected with the synchronous detection circuit, so that the control device of the cooking appliance in the technical scheme has all beneficial effects and is not repeated herein.
In this technical scheme, the cooking utensil includes heating coil and synchronous detection circuit. The synchronous detection circuit is connected with the heating coil, acquires the resonance period of the heating coil, and sends the resonance period to the control device of the cooking appliance, so that the control device of the cooking appliance controls the cooking appliance according to the resonance period. The control device determines the change rate of the resonance period according to the collected resonance period, can judge whether the water in the cooking utensil is boiled according to the change rate of the resonance period, and controls the action of the cooking utensil according to the boiling state of the water in the cooking utensil.
In any of the above technical solutions, the cooking appliance further includes: a housing; the heating panel is arranged on the shell; and the temperature detection device is arranged in the shell and is connected with the control device and used for collecting the temperature value of the heating panel.
In this technical scheme, cooking utensil still includes casing, heating panel, temperature-detecting device. The heating panel is arranged on the shell of the cooking utensil, the temperature detection device is arranged in the shell, the temperature detection device is connected with the control device and used for collecting the temperature of the heating panel and sending the temperature to the control device, the control device judges whether water in the cooking utensil is in a boiling state according to the collected temperature of the heating panel and the change rate of the resonance period, and the control device controls the action of the cooking utensil according to the boiling state of the water in the cooking utensil.
In any of the above technical solutions, the cooking appliance further comprises a switch tube and a switch tube driving device. The switching tube is specifically an IGBT switching tube, the control device outputs a PPG signal to the switching tube driving device, the switching tube driving device synchronously outputs a gate pole (VG) signal to the gate pole of the IGBT, at the moment, the IGBT is conducted, and the heating coil is electrified. When the VG signal returns to zero, the IGBT is turned off. When the IGBT turns off, the current of the heating coil does not immediately disappear, and at this time, the resonance capacitor connected in parallel to the heating coil is charged to start resonance, and the collector voltage of the IGBT rises. The synchronous detection circuit comprises a comparator connected in parallel to two ends of the resonant capacitor and the heating coil to obtain a resonant synchronous signal, when the resonance reaches a zero point, the comparator has a turnover signal, and the control device outputs a PPG signal at the moment to drive the IGBT to be conducted next time. Therefore, the working period value of the switching tube and the pulse width of the pulse program generator signal can be obtained through the synchronous detection circuit.
In any of the above technical solutions, the cooking appliance further comprises a pot.
In the technical scheme, the cooker is prevented from being arranged on the heating panel of the cooking appliance, and the cooking appliance work heating coil is used for heating the cooker on the heating panel.
According to a fourth aspect of the present invention, a computer-readable storage medium is presented, on which a computer program is stored, which computer program, when being executed by a processor, implements a control method of a cooking appliance as in any of the above-mentioned aspects. Therefore, the computer readable storage medium includes all the advantages of the control method of the cooking appliance as provided in any of the above claims, and will not be described herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of the principle of dry burning prevention of an induction cooker in the prior art;
Fig. 2 illustrates a flow chart of a control method of a cooking appliance according to an embodiment of the present invention;
Fig. 3 illustrates another flow diagram of a control method of a cooking appliance according to an embodiment of the present invention;
fig. 4 illustrates a flow chart of a control method of a cooking appliance according to another embodiment of the present invention;
fig. 5 illustrates a flow chart of a control method of a cooking appliance according to still another embodiment of the present invention;
Fig. 6 illustrates a flow chart of a control method of a cooking appliance according to a complete embodiment of the present invention;
Fig. 7 is a flowchart illustrating a control method of a cooking appliance according to another complete embodiment of the present invention;
fig. 8 illustrates a control circuit diagram of a cooking appliance according to an embodiment of the present invention;
Fig. 9 shows a schematic block diagram of a control device of a cooking appliance according to an embodiment of the present invention;
fig. 10 illustrates a graph of a resonance period and a temperature sampling variation of a water boiling process of a cooking appliance according to an embodiment of the present invention.
The correspondence between the reference numerals and the component names in fig. 1 is:
10 cookware, 20 heating panel, 30 thermistor.
The correspondence between the reference numerals and the component names in fig. 8 is:
82 synchronous detection circuit, 84 temperature detection circuit.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
A control method of a cooking appliance, a control device of a cooking appliance, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 2 to 10.
Embodiment one:
As shown in fig. 2, in one embodiment of the present invention, there is provided a control method of a cooking appliance including a heating coil, the control method including:
step S202, a first resonance period value of a heating coil is obtained, and the change rate of the resonance period value in a first set duration is determined;
step S204, controlling the operation of the heating coil according to the change rate of the resonance period value.
In this embodiment, the control method is used for a cooking appliance, and the cooking appliance includes a heating coil, that is, the cooking appliance heats the cooker by generating electromagnetic induction between the heating coil and the cooker. In the heating process of the cooking utensil, the resonant period of the cooking utensil is collected, the change rate of the resonant period value in the first set duration is calculated, whether water in the cooker heated by the cooking utensil is boiled is judged according to the change rate of the resonant period value, and then the work of the heating coil is controlled. And when the water in the pot is judged to be boiling, the heating coil is controlled to stop working, and when the water in the pot is judged not to be boiling, the heating coil is controlled to continue working, so that the pot is heated.
In the working process of the heating coil, a coupling inductance is generated between the heating coil and the cooker. When the temperature of the cooker changes, the coupling inductance also changes, and the specific reaction is that the temperature of the cooker rises, and the coupling inductance also rises. When the coupling inductance increases, the resonance period value of the heating coil increases, and the change is immediate and there is little hysteresis. In the stage of boiling water, the temperature change of the cooker is obvious, the resonance period value of the heating coil can be changed greatly, and the change rate of the resonance period value can be reduced in the stage of boiling water. Therefore, whether the water in the cooker boils or not can be rapidly and accurately judged by detecting the resonance period value and the variation of the resonance period value of the heating coil in real time, and if the water is judged to be boiled, the heating coil is controlled to stop working.
In the working process of the heating coil, the resonance period value of the heating coil and the variation of the resonance period value are calculated in real time, whether water in the cooker is boiled or not is judged according to the resonance period value of the heating coil and the variation of the resonance period value, then the working of the heating coil is controlled, the heating coil is rapidly controlled to stop working, then the water can be timely judged to be started, delayed shutdown or early shutdown is avoided, and the use experience of a user is improved.
It can be understood that whether the water in the cookware of the cooking utensil is boiled or not is judged by the resonance period value of the heating coil, and the cooking utensil is suitable for being used in the environment of the plateau area. In the plateau environment, the boiling point of water is relatively low, and if the detection is performed according to the temperature in the related art, it is easy to determine that the water is not boiled even if the water is boiled. However, the judgment is carried out by utilizing the change rate of the resonance period value, so that whether the water is in a boiling state can be accurately and easily judged.
As shown in fig. 3, in the above embodiment, the step of acquiring the first resonance period value of the heating coil and determining the rate of change of the resonance period value includes:
Step S302, determining a second resonance period value of the heating coil, and determining a first resonance period value of the heating coil after delaying for a first set period of time;
Step S304, calculating the difference value between the second resonance period value and the first resonance period value, and determining the change rate of the resonance period value according to the ratio of the difference value to the first set time length.
In this embodiment, an initial resonance period value of the heating coil is first obtained as a second resonance period value, after a first set period is delayed, the resonance period value of the heating coil is obtained as the first resonance period value, the first resonance period value is subtracted by the second resonance period value to obtain a variation of a resonance period in the first set period, and then the obtained variation of the resonance period in the first set period is divided by the first set period to obtain a resonance period variation rate in the first set period, so that the cooking appliance is controlled according to the obtained resonance period variation rate.
It is understood that the cooking appliance includes a control device and a switching tube. The switching tube comprises an IGBT (Insulated Gate Bipolar Transistor ), the control device outputs a PPG (Programme Pulse Generator, pulse program generator) signal to the switching tube driving device, the switching tube driving device synchronously outputs a gate pole (VG) signal to the gate pole of the IGBT, the IGBT is turned on at the moment, and when the VG signal returns to zero, the IGBT is turned off at the moment, and resonance starts. Therefore, in one working period of the switching tube, the width of a single pulse and one resonance period are included, and the resonance period value can be accurately determined according to the working period value of the switching tube and the pulse width of the pulse program generator signal, so that the accuracy of dry combustion judgment is improved. Thereby acquiring a first resonance period value and a second resonance period value of the heating coil.
Embodiment two:
as shown in fig. 4, in another embodiment of the present invention, there is provided a control method of a cooking appliance including a heating coil, the control method including:
Step S402, a first resonance period value of a heating coil is obtained, and the change rate of the resonance period value in a first set duration is determined;
step S404, determining that the cooking utensil is in a set working state based on the first resonance period value being larger than the set resonance period value and the change rate of the resonance period being smaller than the set resonance period change rate;
Step S406, time the duration of the cooking utensil in the set working state, and control the cooking utensil to stop working based on the duration of the set working state being greater than or equal to the second set duration.
In this embodiment, when the change rate of the resonance period satisfies the set condition, it may be determined that the cooking appliance is in the set working state, the duration of the cooking appliance in the set working state is counted, and when the counted duration reaches the second set duration, it is determined that water in the cooking appliance is in the boiling state, and the cooking appliance is controlled to stop working. The first resonance period value is larger than the set resonance period value, it can be determined that the detected temperature of the cooking appliance reaches the set temperature, and the resonance period change rate is smaller than the set resonance period change rate, then the current resonance period value is judged to be in a stable state, the temperature change of the cooking appliance is smaller, after the second set period is continued, water in the pot of the cooking appliance is considered to be in a boiling state, and a heating coil in the cooking appliance is controlled to stop working. If the first resonance period value is smaller than the set resonance period value, judging that the temperature of the current cooking utensil does not reach the set temperature, judging that the resonance period change rate is larger than the set resonance period change rate, judging that the current resonance period value is in a continuous change state, and controlling the cooking utensil to continuously work normally to heat if the water temperature in the cooker of the cooking utensil is in a continuous rising state.
It can be understood that the set working state of the cooking appliance is that the resonance period change rate of the heating coil is small, i.e. the temperature of water in the cooker of the cooking appliance is relatively stable. .
Embodiment III:
as shown in fig. 5, in still another embodiment of the present invention, there is provided a control method of a cooking appliance including a heating coil and a heating panel, the control method including:
Step S502, a first resonance period value of the heating coil is obtained, and the change rate of the resonance period value in a first set duration is determined;
step S504, collecting a temperature value of the heating panel after a first set time period;
Step S506, determining that the cooking utensil is in a set working state based on the fact that the temperature value is larger than the set temperature value and the change rate of the resonance period is smaller than the change rate of the set resonance period;
Step S508, counting the time length of the cooking utensil in the set working state, and controlling the cooking utensil to stop working based on the time length in the set working state being greater than or equal to the second set time length.
In this embodiment, the temperature value of the heating panel after the first set period of time is collected before the step of judging whether water in the cookware of the cooking appliance is boiled by the rate of change of the resonance period. According to the temperature value of the heating panel, whether the water in the cooker of the cooking utensil reaches the temperature requirement can be determined. When the heating panel of the cooking utensil meets the temperature requirement, judging whether water in a cooker of the cooking utensil is boiled according to the resonance period change rate of a heating coil in the cooking utensil, and controlling a heating coil according to whether the water in the cooker of the cooking utensil is boiled. When the detected temperature value of the heating panel is larger than the set temperature value and the change rate of the resonance period is smaller than the set resonance period change rate, the current resonance period value is judged to be in a stable state, the temperature change of the cooking utensil is smaller, the cooking utensil is determined to be in a set working state, after the second set duration is continued, water in the pot of the cooking utensil is considered to be in a boiling state, and the heating coil in the cooking utensil is controlled to stop working. If the temperature of the heating panel is smaller than the set temperature value and the resonance period change rate is larger than the set resonance period change rate, the current resonance period value is judged to be in a continuous change state, and the water temperature in the cookware in the cooking utensil is determined to be in a continuous rising state, so that the cooking utensil is controlled to continue to normally work for heating.
Embodiment four:
As shown in fig. 6, in a complete embodiment of the present invention, there is provided a control method of a cooking appliance including a heating coil and a heating panel, the control method including:
Step S602, obtaining a resonance period value TS0 and a resonance period change rate DeltaTS;
step S604, judging whether TS0 > TS1, if yes, executing step S606, and if no, executing step S612;
step S606, judging whether DeltaTS is less than A, if yes, executing step S608, and if not, executing step S612;
step S608, delaying the time B, and judging boiling;
Step S610, stopping heating;
step S612, heating normally.
Wherein TS1 is a set resonance period value, and A is a set resonance period change rate.
In this embodiment, the pot temperature rise causes the system coupling inductance to increase, so the resonant period follows the increase. After water is boiled, the temperature change of the pot is not obvious, and the boiling can be judged through the resonance period change rate. And acquiring a resonance period TS0 of the system and a change rate DeltaTS of the resonance period in real time, wherein the change rate sampling time is in a range of 0.1s to 10s, and when TS0 is larger than a preset value TS1 and DeltaTS is smaller than A, delaying time B to judge water boiling.
Wherein, 0.1us < A < 5us; b is more than or equal to 0s and less than or equal to 120s.
In another complete embodiment of the present invention, as shown in fig. 7, there is provided a control method of a cooking appliance including a heating coil and a heating panel, the control method including:
step S702, obtaining a heating panel temperature TEMP0;
step S704, obtaining a resonance period change rate DeltaTS;
step S706, judging whether TEMP 0> TEMP1, if yes, executing step S708, if no, executing step S714;
Step S708, judging whether DeltaTS < A, if yes, executing step S710, if no, executing step S714;
Step S710, delaying time B, judging boiling;
Step S712, stopping heating;
Step S714, normal heating.
Wherein TEMP1 is a set temperature value, and a is a set resonance period change rate.
In the embodiment, the resonance period TS0 of the system and the change rate delta TS of the resonance period are obtained in real time, and the change rate sampling time is in the interval of 0.1s to 10 s; acquiring the temperature TMP0 of the heating panel in real time; and when TMP0 is larger than a preset value TMP1 and DeltaTS < A, delaying the time B, and judging that the water boils.
Wherein A is more than or equal to 0.1us and less than or equal to 5us; b is more than or equal to 0s and less than or equal to 120s.
As shown in fig. 10, the resonant period and the temperature sampling change curve of the cooking appliance during the water injection process. The curve (1) is a resonance period change curve, and the curve (2) is a temperature sampling curve of the thermosensitive assembly.
In the boiling stage of water, the resonance period changes obviously, and the sampling temperature also rises due to the hysteresis of temperature sampling. After the water is boiled, the temperature of the pot is higher than the boiling point. The resonance system consists of a resonance capacitor, a resonance inductor (heating coil) and a cooker. The temperature of the cooker rises, the magnetic permeability of the cooker changes along with the change, the coupling inductance of the system rises, and the resonance period of the system rises. After boiling, the water temperature is constant, the temperature of the pot is not obviously increased, and the resonance period is also not obviously changed.
Fifth embodiment:
as shown in fig. 9, in one embodiment of the present invention, there is provided a control device 900 of a cooking appliance, including: a memory 910; a processor 920, and a computer program stored on the memory 910 and executable on the processor 920; the computer program when executed by the processor 920 implements the control method of the cooking appliance according to any one of the above-described aspects. Thus having all the advantages of the control method of the cooking appliance in any of the embodiments described above.
Example six:
In another embodiment of the present invention, there is provided a cooking appliance including: a heating coil; the synchronous detection circuit is connected with the heating coil and is configured to acquire the resonance period of the heating coil; the control device of the cooking appliance in the technical scheme is connected with the synchronous detection circuit, so that the control device of the cooking appliance in the technical scheme has all beneficial effects and is not repeated herein.
In this embodiment, the cooking appliance includes a heating coil and a synchronous detection circuit. The synchronous detection circuit is connected with the heating coil, acquires the resonance period of the heating coil, and sends the resonance period to the control device of the cooking appliance, so that the control device of the cooking appliance controls the cooking appliance according to the resonance period. The control device determines the change rate of the resonance period according to the collected resonance period, can judge whether the water in the cooking utensil is boiled according to the change rate of the resonance period, and controls the action of the cooking utensil according to the boiling state of the water in the cooking utensil.
In any of the above embodiments, the cooking appliance further comprises: a housing; the heating panel is arranged on the shell; and the temperature detection device is arranged in the shell and is connected with the control device and used for collecting the temperature value of the heating panel.
In this embodiment, the cooking appliance further comprises a housing, a heating panel, and a temperature detecting device. The heating panel is arranged on the shell of the cooking utensil, the temperature detection device is arranged in the shell, the temperature detection device is connected with the control device and used for collecting the temperature of the heating panel and sending the temperature to the control device, the control device judges whether water in the cooking utensil is in a boiling state according to the collected temperature of the heating panel and the change rate of the resonance period, and the control device controls the action of the cooking utensil according to the boiling state of the water in the cooking utensil.
In any of the above embodiments, the cooking appliance further comprises a pan.
In this embodiment, the cookware is prevented from being on the heating panel of the cooking appliance, and the cooking appliance work heating coil heats the cookware on the heating panel.
As shown in fig. 8, in any of the above embodiments, the cooking appliance further includes a switching tube and a switching tube driving device. The switching tube is specifically an IGBT switching tube, the control device outputs a PPG signal to the switching tube driving device, the switching tube driving device synchronously outputs a gate pole (VG) signal to the gate pole of the IGBT, at the moment, the IGBT is conducted, and the heating coil is electrified. When the VG signal returns to zero, the IGBT is turned off. When the IGBT turns off, the current of the heating coil does not immediately disappear, and at this time, a resonance capacitor connected in parallel to the heating coil is charged to start resonance, and the collector voltage of the IGBT rises. The synchronous detection circuit comprises a comparator connected in parallel to two ends of the resonant capacitor and the heating coil to obtain a resonant synchronous signal, when the resonance reaches a zero point, the comparator has a turnover signal, and the control device outputs a PPG signal at the moment to drive the IGBT to be conducted next time. Therefore, the working period value of the switching tube and the pulse width of the pulse program generator signal can be obtained through the synchronous detection circuit.
Fig. 8 is a control circuit diagram of a cooking appliance, including: the current fuse F1, the bridge pile D1, the filter capacitor C1, the resonant capacitor C2, the choke coil L1, the resonant inductor L2 (namely a heating coil), the power tube IGB, the control device U1, the switching tube driving device U2, the synchronous detection circuit 82 (comprising resistors R1, R2, R3 and R4 and the comparator CMP), the temperature detection circuit 84 (comprising the thermistor RT, the resistors R5 and R6 and the capacitor C3) and other modules.
Wherein: the control device sends PPG signals to the switching tube driving device to drive the IBGT to be conducted or closed, so that IH (electromagnetic) heating is realized.
The control device acquires a resonance synchronous signal through the synchronous detection module, and when resonance reaches a zero point (a turning signal exists in CMP), the control device automatically outputs a PPG signal to drive the next conduction of the IGBT. The control means controls the PPG signal width according to the power level. The higher the power, the greater the PPG signal width.
Embodiment seven:
In one embodiment of the present invention, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor, implements the control method of a cooking appliance as provided in any of the above embodiments, and thus, the computer readable storage medium includes all the advantages of the control method of a cooking appliance as provided in any of the above embodiments, which are not described herein.
In the present invention, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A control method of a cooking appliance, the cooking appliance including a heating coil, the control method comprising:
Acquiring a first resonance period value of the heating coil, and determining the change rate of the resonance period value in a first set time length;
Controlling the operation of the heating coil according to the change rate of the resonance period value;
the step of acquiring a first resonance period value of the heating coil and determining a change rate of the resonance period value specifically includes:
Determining a second resonance period value of the heating coil, and determining a first resonance period value of the heating coil after delaying the first set time length;
And calculating a difference value between the second resonance period value and the first resonance period value, and determining the change rate of the resonance period value according to the ratio of the difference value to the first set duration.
2. The method of controlling a cooking appliance according to claim 1, wherein the step of controlling the operation of the heating coil according to the rate of change of the resonance period value comprises:
determining that the cooking appliance is in a set working state according to the change rate of the resonance period value;
And timing the duration of the cooking utensil in the set working state, and controlling the cooking utensil to stop working based on the fact that the duration in the set working state is greater than or equal to a second set duration.
3. The method of controlling a cooking appliance according to claim 2, wherein the step of determining that the cooking appliance is in a set operating state according to the rate of change of the resonance period value specifically includes:
And determining that the cooking appliance is in a set working state based on the fact that the first resonance period value is larger than the set resonance period value and the change rate of the resonance period value is smaller than the change rate of the set resonance period value.
4. The method of controlling a cooking appliance according to claim 2, further comprising a heating panel, the step of determining that the cooking appliance is in a set operation state according to a rate of change of the resonance period value, further comprising:
and collecting the temperature value of the heating panel after the first set time period.
5. The method according to claim 4, wherein the step of determining that the cooking appliance is in a set operation state according to the rate of change of the resonance period value, specifically comprises:
And determining that the cooking appliance is in a set working state based on the fact that the temperature value is larger than a set temperature value and the change rate of the resonance period value is smaller than the change rate of the set resonance period value.
6. A control device of a cooking appliance, comprising:
A memory;
a processor, and a computer program stored on the memory and executable on the processor;
The computer program, when executed by the processor, implements a control method of a cooking appliance as claimed in any one of claims 1 to 5.
7. A cooking appliance, comprising:
A heating coil;
The synchronous detection circuit is connected with the heating coil and is configured to acquire a resonance period value of the heating coil;
The control device of the cooking appliance according to claim 6, wherein the control device is connected to the synchronous detection circuit.
8. The cooking appliance of claim 7, further comprising:
A housing;
a heating panel disposed on the housing;
the temperature detection device is arranged in the shell and is connected with the control device and used for collecting the temperature value of the heating panel.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the control method of a cooking appliance according to any one of claims 1 to 5.
CN202010472950.XA 2020-05-29 2020-05-29 Control method and control device for cooking appliance, cooking appliance and storage medium Active CN113747619B (en)

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Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2006066182A (en) * 2004-08-26 2006-03-09 Mitsubishi Electric Corp Induction heating cooker and its control method
JP2011249214A (en) * 2010-05-28 2011-12-08 Mitsubishi Electric Corp Heating cooker
CN105684550A (en) * 2013-10-24 2016-06-15 三菱电机株式会社 Induction heating cooker
CN106979541A (en) * 2017-05-12 2017-07-25 深圳国创名厨商用设备制造有限公司 The control method of electromagnetic heater and anti-dry
CN210328043U (en) * 2019-07-08 2020-04-14 广州帝胜智能科技有限公司 Magnetic energy heating system with dry burning protection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006066182A (en) * 2004-08-26 2006-03-09 Mitsubishi Electric Corp Induction heating cooker and its control method
JP2011249214A (en) * 2010-05-28 2011-12-08 Mitsubishi Electric Corp Heating cooker
CN105684550A (en) * 2013-10-24 2016-06-15 三菱电机株式会社 Induction heating cooker
CN106979541A (en) * 2017-05-12 2017-07-25 深圳国创名厨商用设备制造有限公司 The control method of electromagnetic heater and anti-dry
CN210328043U (en) * 2019-07-08 2020-04-14 广州帝胜智能科技有限公司 Magnetic energy heating system with dry burning protection

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