CN113741228A - Control method of cooking appliance, cooking appliance and computer readable storage medium - Google Patents

Control method of cooking appliance, cooking appliance and computer readable storage medium Download PDF

Info

Publication number
CN113741228A
CN113741228A CN202010473794.9A CN202010473794A CN113741228A CN 113741228 A CN113741228 A CN 113741228A CN 202010473794 A CN202010473794 A CN 202010473794A CN 113741228 A CN113741228 A CN 113741228A
Authority
CN
China
Prior art keywords
electromagnetic heating
resonance period
heating circuit
period value
cooking appliance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010473794.9A
Other languages
Chinese (zh)
Other versions
CN113741228B (en
Inventor
江德勇
郑量
黄庶锋
任祥喜
王云峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Original Assignee
Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd filed Critical Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority to CN202010473794.9A priority Critical patent/CN113741228B/en
Publication of CN113741228A publication Critical patent/CN113741228A/en
Application granted granted Critical
Publication of CN113741228B publication Critical patent/CN113741228B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0428—Safety, monitoring
    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/26—Pc applications
    • G05B2219/2643—Oven, cooking
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

The invention provides a control method of a cooking appliance, the cooking appliance and a computer readable storage medium, wherein the control method of the cooking appliance comprises the following steps: determining a resonance period value of the electromagnetic heating circuit, and calculating the variation of the resonance period value; and controlling the work of the electromagnetic heating circuit according to the resonance period value and the change amount of the resonance period value. In the technical scheme provided by the invention, in the working process of the electromagnetic heating circuit, the resonance period value of the electromagnetic heating circuit and the variation of the resonance period value are calculated in real time, whether dry burning occurs is judged according to the resonance period value of the electromagnetic heating circuit and the variation of the resonance period value, and then the work of the electromagnetic heating circuit is controlled, so that whether dry burning occurs in the cooker can be quickly and accurately judged, and when the dry burning occurs, the electromagnetic heating circuit is quickly controlled to stop working, so that the dry burning can be effectively prevented, and the safety of the cooker is effectively improved.

Description

Control method of cooking appliance, cooking appliance and computer readable storage medium
Technical Field
The invention relates to the technical field of cooking appliances, in particular to a control method of a cooking appliance, the cooking appliance and a computer readable storage medium.
Background
In the related art, for a cooking appliance having IH (Induction Heating), it heats food by an electromagnetic Heating means. A conventional IH cooking appliance, such as an induction cooker, as shown in fig. 1, obtains the temperature of a pot 10 by providing a thermistor 30, and then determines whether dry-cooking occurs. Because the thermistor is arranged below the heating panel 20, due to the heat conduction hysteresis of the heating panel 20, the thermistor 30 has certain hysteresis for sampling the temperature, and dry burning judgment is easily out of time, so that fire risks exist.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
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 cooking appliance.
A third aspect of the invention proposes a computer-readable storage medium.
In view of this, a first aspect of the present invention provides a control method of a cooking appliance, the cooking appliance including an electromagnetic heating circuit, the control method including: determining a resonance period value of the electromagnetic heating circuit, and calculating the variation of the resonance period value; and controlling the work of the electromagnetic heating circuit according to the resonance period value and/or the change of the resonance period value.
In this technical scheme, cooking utensil can be IH cooking utensil, produces electromagnetic induction between the heating coil in the electromagnetic heating circuit promptly and the pan, and then realizes heating. In the working process of the electromagnetic heating circuit, the resonance period value of the electromagnetic heating circuit and the variation of the resonance period value are calculated in real time, whether dry burning occurs or not is judged according to the resonance period value of the electromagnetic heating circuit and the variation of the resonance period value, and then the working of the electromagnetic heating circuit is controlled.
Specifically, in the working process of the electromagnetic heating circuit, coupling inductance is generated between the electromagnetic heating circuit 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 rises, the value of the resonant period of the electromagnetic heating circuit also increases, and the change is instantaneous and almost without hysteresis. Therefore, when the pot is dry-burned and the temperature rises rapidly, the resonant period value of the electromagnetic heating circuit and the variation of the resonant period value will change immediately. Therefore, the resonance period value and the variation of the resonance period value of the electromagnetic heating circuit are detected in real time, whether the cooking utensil is dried or not can be judged quickly and accurately, when the boiler is judged to be dried, the electromagnetic heating circuit is controlled to stop working quickly, the boiler can be prevented from being dried effectively, and the safety of the cooking utensil is improved effectively.
In addition, the control method of the cooking appliance in the above technical solution provided by the present invention may further have the following additional technical features:
in the above technical solution, the cooking appliance further comprises a control device and a switch tube; and determining a resonant period value of the electromagnetic heating circuit, specifically comprising: acquiring a working period value of a switching tube and acquiring a pulse width of a pulse program generator signal corresponding to a control device; and determining the resonant period value according to the working period value and the pulse width.
In this technical scheme, cooking utensil includes controlling means and switch tube. The switching tube comprises an Insulated Gate Bipolar Transistor (IGBT), the control device outputs a Pulse voltage Generator (PPG) signal to the switching tube driving device, the switching tube driving device can synchronously output a Gate electrode signal (VG) to a Gate electrode of the IGBT, the IGBT is switched on at the moment, and when the VG signal returns to zero, the IGBT is switched off and starts to resonate at the moment.
Therefore, in a working period of the switching tube, the width of a single pulse and a resonance period are included, so that 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, and the accuracy of dry burning judgment is improved.
In any of the above technical solutions, the step of calculating the variation of the resonant period value specifically includes: determining a first resonance period value of the electromagnetic heating circuit, and determining a second resonance period value of the electromagnetic heating circuit after delaying the target time length; and calculating the difference value between the second resonance period value and the first resonance period value, and determining the variation of the resonance period value according to the difference value.
In this technical solution, the variation of the value of the resonance period is defined as the variation of the resonance period (in μ s) in a unit time length. For example, with the target time length of 1 second as an interval, the first resonance period value and the second resonance period value are determined in sequence, and the difference between the second resonance period value and the first resonance period value is calculated, assuming that the first resonance period value is 10 μ s, the second resonance period value is 12 μ s, and the calculated difference is 2 μ s, the variation is determined to be 2 μ s.
In any of the above technical solutions, the step of controlling the operation of the electromagnetic heating circuit according to the resonance period value and the change amount of the resonance period value specifically includes: and controlling the electromagnetic heating circuit to stop working based on that the resonance period value is larger than or equal to the resonance period value threshold value and/or the variation of the resonance period value is larger than or equal to the variation threshold value.
In the technical scheme, when at least one of the resonance period is greater than or equal to the resonance period threshold value and the variation of the resonance period is greater than the variation threshold value, the resonance period value is relatively fluctuated, the possibility of dry burning exists, the electromagnetic heating circuit is controlled to stop heating at the moment, the temperature of the cooker is prevented from further rising, the dangerous conditions such as fire and the like are avoided, and the use safety of the cooking utensil is effectively ensured.
In any of the above technical solutions, the method for controlling a cooking appliance further includes: and controlling the electromagnetic heating circuit to maintain the working state based on that the resonance period value is smaller than the resonance period threshold value and the variation of the resonance period value is smaller than the variation threshold value.
In the technical scheme, if the value of the resonance period is smaller than the threshold of the resonance period and the variation of the resonance period is smaller than the threshold of the variation, it indicates that the current value of the resonance period is in a stable state, the cooking appliance works normally, and no dry burning phenomenon occurs. At the moment, dry burning protection is not needed, and the electromagnetism is controlled to maintain the current working state.
In any of the above technical solutions, the method for controlling a cooking appliance further includes: acquiring the working power of an electromagnetic heating circuit; and controlling the work of the electromagnetic heating circuit according to the resonance period value and the change amount of the resonance period value based on the working power being greater than or equal to the power threshold value.
In this technical scheme, when the power of electromagnetic heating circuit is greater than the power threshold value, also when electromagnetic heating circuit heats with "high-power", the heat that its produced is higher, therefore the temperature variation of the food material in pan and the pan is comparatively violent, just takes place dry combustion method in the very short time as the phenomenon easily. At this time, in order to ensure the safe use of the cooking appliance, the operation of the electromagnetic heating circuit is controlled according to the value of the resonant period of the electromagnetic heating circuit and the variation of the resonant period.
In any of the above technical solutions, the cooking appliance further includes a panel and a temperature detection circuit, the temperature detection circuit is configured to detect a surface temperature corresponding to the panel; and based on the operating power being less than the power threshold, the control method of the cooking appliance further comprises: and controlling the electromagnetic heating circuit to stop working based on the surface temperature being greater than or equal to the temperature threshold value.
In this technical scheme, cooking utensil still includes panel and temperature detection circuit, and wherein the panel is used for placing the pan, and the pan is after placing the panel, and the electromagnetic heating circuit between the coupling to realize the heating through electromagnetic induction. Meanwhile, the cookware is in close contact with the panel, so that the temperature of the cookware is basically consistent with that of the panel, and the cookware temperature can be determined by setting the temperature detection circuit to acquire the surface temperature of the panel.
Specifically, when the operating power of the electromagnetic heating circuit is smaller than the power threshold, that is, the electromagnetic heating circuit heats with "low power", the heat generated by the electromagnetic heating circuit is low, and therefore, the temperature change of the food materials in the cookware and the pot is gentle. The phenomenon is that the cookware can not be dried in a short time. Meanwhile, due to the characteristics of the electromagnetic heating circuit, when the electromagnetic heating circuit works at lower power, the resonance period value of the electromagnetic heating circuit can fluctuate naturally, and the fluctuations are possibly unrelated to the temperature change of the cooker.
Therefore, when the working power of the electromagnetic heating circuit is smaller than the power threshold, whether the cooking utensil is baked or not is judged through the temperature detection circuit, if the surface temperature of the panel is larger than or equal to the temperature threshold, the baking condition is likely to occur, the electromagnetic heating circuit is controlled to stop working at the moment, the condition that the judgment is not timely caused by the hysteresis of temperature conduction is avoided, and the stability of the cooking utensil in the low power process can be improved on the premise that the baking condition is not ensured.
A second aspect of the present invention provides a cooking appliance comprising: a heating control circuit; a memory configured to store a computer program; the processor is configured to execute a computer program to implement the control method of the cooking appliance provided in any one of the above technical solutions, and therefore, the cooking appliance includes all the beneficial effects of the control method of the cooking appliance provided in any one of the above technical solutions, which are not described herein again.
In the above technical solution, the heating control circuit includes: an electromagnetic heating circuit; the switching tube is connected with the electromagnetic heating circuit; a control device configured to generate a pulse program generator signal; the switching tube driving device is connected with the control device and the switching tube and is configured to drive the switching tube to work according to the pulse generation signal; and the synchronous detection circuit is connected with the control device and the electromagnetic heating circuit and is configured to acquire the working period value of the switching tube and the pulse width of the pulse program generator signal.
In the technical scheme, the heating control circuit comprises an electromagnetic heating circuit, a switching tube, a control device, a switching tube driving device and a synchronous detection circuit. The electromagnetic heating circuit comprises a coil panel, the switch tube is specifically an IGBT (insulated gate bipolar transistor) switch tube, the control device outputs PPG (photoplethysmography) signals to the switch tube driving device, the switch tube driving device can synchronously output a gate pole (VG) signal to a gate pole of the IGBT, the IGBT is conducted at the moment, and the coil panel is electrified. When the VG signal returns to zero, the IGBT turns off.
When the IGBT is turned off, the current of the coil panel does not disappear immediately, at the moment, the coil panel charges a resonance capacitor connected with the coil panel in parallel, resonance starts, and the voltage of a collector of the IGBT rises.
Synchronous detection circuit includes the comparator, connects in parallel to the both ends of resonance electric capacity and coil panel to obtain resonance synchronizing signal, when the resonance when zero, the comparator has the upset signal, and controlling means output PPG signal this moment drives IGBT's next time and switches on. Therefore, the duty cycle 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 includes: a panel; and the temperature detection circuit is connected with the control device and is configured to detect the surface temperature corresponding to the panel.
In this technical scheme, cooking utensil still includes panel and temperature detection circuit, and wherein the panel is used for placing the pan, and the pan is after placing the panel, and the electromagnetic heating circuit between the coupling to realize the heating through electromagnetic induction. Meanwhile, the cookware is in close contact with the panel, so that the temperature of the cookware is basically consistent with that of the panel, and the cookware temperature can be determined by setting the temperature detection circuit to acquire the surface temperature of the panel.
A third aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the control method of the cooking appliance according to any one of the above-mentioned technical solutions, and therefore, the computer-readable storage medium includes all the advantages of the control method of the cooking appliance according to any one of the above-mentioned technical solutions, which are not described herein again.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram illustrating the principle of preventing dry heating of an induction cooker in the prior art;
fig. 2 shows a flowchart of a control method of a cooking appliance according to an embodiment of the present invention;
fig. 3 illustrates another flowchart of a control method of a cooking appliance according to an embodiment of the present invention;
fig. 4 shows yet another flowchart of a control method of a cooking appliance according to an embodiment of the present invention;
fig. 5 illustrates still another flowchart of a control method of a cooking appliance according to an embodiment of the present invention;
fig. 6 illustrates still another flowchart of a control method of a cooking appliance according to an embodiment of the present invention;
fig. 7 illustrates a control circuit diagram of a cooking appliance according to an embodiment of the present invention;
FIG. 8 illustrates driving and resonance waveforms in operation of a cooking appliance according to an embodiment of the present invention;
FIG. 9 illustrates a graph of experimental data relating pot temperature to coupled inductance during operation of a cooking appliance in accordance with an embodiment of the present invention;
FIG. 10 is a graph illustrating a variation of a resonance period during a water boiling process of the cooking appliance;
fig. 11 shows still another flowchart of a control method of a cooking appliance according to an embodiment of the present invention.
Wherein, the corresponding relation between the reference numbers and the part names in fig. 1 is:
10 pot, 20 heating panel, 30 thermistor.
The correspondence between reference numerals and part names in fig. 7 is:
72 synchronous detection circuit, 74 temperature detection circuit.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A control method 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 11.
Example one
As shown in fig. 2, in an embodiment of the present invention, there is provided a control method of a cooking appliance, the cooking appliance including an electromagnetic heating circuit, a control device and a switching tube, the control method including:
step S202, determining a resonance period value of the electromagnetic heating circuit, and calculating the variation of the resonance period value;
and step S204, controlling the work of the electromagnetic heating circuit according to the resonance period value and/or the change amount of the resonance period value.
In step S202, as shown in fig. 3, the step of determining the resonant period value of the electromagnetic heating circuit specifically includes:
step S302, acquiring a working period value of a switching tube, and acquiring a pulse width of a pulse program generator signal corresponding to a control device;
step S304, determining a resonant period value according to the duty period value and the pulse width.
As shown in fig. 4, the step of calculating the variation of the resonant period value specifically includes:
step S402, determining a first resonance period value of the electromagnetic heating circuit, and determining a second resonance period value of the electromagnetic heating circuit after delaying the target time length;
step S404, calculating a difference value between the second resonant period value and the first resonant period value, and determining the variation of the resonant period value according to the difference value.
In step S204, as shown in fig. 5, the step of controlling the operation of the electromagnetic heating circuit according to the value of the resonance period and the change amount of the resonance period specifically includes:
step S502, controlling the electromagnetic heating circuit to maintain the working state based on the fact that the resonance period value is smaller than the resonance period threshold value and the variation of the resonance period value is smaller than the variation threshold value;
in step S504, based on the resonant period value being greater than or equal to the resonant period value threshold and/or the variation of the resonant period value being greater than or equal to the variation threshold, the electromagnetic heating circuit is controlled to stop working.
In this embodiment, the cooking appliance may be an IH cooking appliance, that is, heating is realized by generating electromagnetic induction between a heating coil in an electromagnetic heating circuit and a pot.
In the working process of the electromagnetic heating circuit, the resonance period value of the electromagnetic heating circuit and the variation of the resonance period value are calculated in real time, whether dry burning occurs or not is judged according to the resonance period value of the electromagnetic heating circuit and the variation of the resonance period value, and then the working of the electromagnetic heating circuit is controlled.
The cooking appliance comprises a control device and a switch tube. The switching tube comprises an Insulated Gate Bipolar Transistor (IGBT), the control device outputs a Pulse voltage Generator (PPG) signal to the switching tube driving device, the switching tube driving device can synchronously output a Gate electrode signal (VG) to a Gate electrode of the IGBT, the IGBT is switched on at the moment, and when the VG signal returns to zero, the IGBT is switched off and starts to resonate at the moment.
Therefore, in a working period of the switching tube, the width of a single pulse and a resonance period are included, so that 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, and the accuracy of dry burning judgment is improved.
The variation of the resonance period value is defined as the variation of the resonance period in unit time length (in mus). For example, with the target time length of 1 second as an interval, the first resonance period value and the second resonance period value are determined in sequence, and the difference between the second resonance period value and the first resonance period value is calculated, assuming that the first resonance period value is 10 μ s, the second resonance period value is 12 μ s, and the calculated difference is 2 μ s, the variation is determined to be 2 μ s.
If the value of the resonance period is smaller than the threshold value of the resonance period and the variation of the resonance period is smaller than the threshold value of the variation, the current value of the resonance period is in a stable state, the cooking appliance works normally, and no dry burning phenomenon occurs. At the moment, dry burning protection is not needed, and the electromagnetism is controlled to maintain the current working state.
When at least one of the resonance period is greater than or equal to the threshold value of the resonance period and the variation of the resonance period is greater than the threshold value of the variation, the resonance period value is greatly fluctuated, the possibility of dry burning exists, the electromagnetic heating circuit is controlled to stop heating at the moment, the temperature of the cookware is prevented from further rising, the dangerous conditions such as fire and the like are avoided, and the use safety of the cooking utensil is effectively ensured.
The threshold value of the resonance period is specifically determined according to the product of the value of the resonance period during boiling and a preset constant. The value of the resonant period during boiling can be obtained through experiments, and assuming that the boiling enables the value of the resonant period to be TS1 and the preset constant to be a, the threshold of the resonant period can be obtained to be TS1 × a.
In some embodiments, A is in the range of 1 ≦ A ≦ 5.
Setting the variation threshold corresponding to the variation of the resonance period as B, the value range of B is:
0.1μs≤B≤10μs。
specifically, in the working process of the electromagnetic heating circuit, coupling inductance is generated between the electromagnetic heating circuit 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 rises, the value of the resonant period of the electromagnetic heating circuit also increases, and the change is instantaneous and almost without hysteresis. Therefore, when the pot is dry-burned and the temperature rises rapidly, the resonant period value of the electromagnetic heating circuit and the variation of the resonant period value will change immediately. Therefore, the resonance period value and the variation of the resonance period value of the electromagnetic heating circuit are detected in real time, whether the cooking utensil is dried or not can be judged quickly and accurately, when the boiler is judged to be dried, the electromagnetic heating circuit is controlled to stop working quickly, the boiler can be prevented from being dried effectively, and the safety of the cooking utensil is improved effectively.
Example two
As shown in fig. 6, in one embodiment of the present invention, the method for controlling a cooking appliance further includes:
step S602, acquiring the working power of the electromagnetic heating circuit;
step S604, based on the working power being greater than or equal to the power threshold, executing the step of controlling the work of the electromagnetic heating circuit according to the resonance period value and the change amount of the resonance period value.
The cooking appliance further comprises a panel and a temperature detection circuit, wherein the temperature detection circuit is configured to detect the surface temperature corresponding to the panel; based on the operating power being less than the power threshold, the method of controlling the cooking appliance further comprises: and controlling the electromagnetic heating circuit to stop working based on the surface temperature being greater than or equal to the temperature threshold value.
In this embodiment, cooking utensil still includes panel and temperature detection circuit, and wherein the panel is used for placing the pan, and the pan is after placing on the panel, and the coupling between with the electromagnetic heating circuit to realize heating through electromagnetic induction. Meanwhile, the cookware is in close contact with the panel, so that the temperature of the cookware is basically consistent with that of the panel, and the cookware temperature can be determined by setting the temperature detection circuit to acquire the surface temperature of the panel.
When the power of the electromagnetic heating circuit is larger than the power threshold value, namely the electromagnetic heating circuit heats with high power, the heat generated by the electromagnetic heating circuit is higher, so that the temperature change of the cookware and the food materials in the cookware is more severe, and the phenomenon is that dry burning is easy to occur in a very short time. At this time, in order to ensure the safe use of the cooking appliance, the operation of the electromagnetic heating circuit is controlled according to the value of the resonant period of the electromagnetic heating circuit and the variation of the resonant period.
When the working power of the electromagnetic heating circuit is smaller than the power threshold, the electromagnetic heating circuit is also heated with low power, the heat generated by the electromagnetic heating circuit is low, and therefore the temperature change of the food materials in the cookware and the cookware is gentle. The phenomenon is that the cookware can not be dried in a short time. Meanwhile, due to the characteristics of the electromagnetic heating circuit, when the electromagnetic heating circuit works at lower power, the resonance period value of the electromagnetic heating circuit can fluctuate naturally, and the fluctuations are possibly unrelated to the temperature change of the cooker.
Therefore, when the working power of the electromagnetic heating circuit is smaller than the power threshold, whether the cooking utensil is baked or not is judged through the temperature detection circuit, if the surface temperature of the panel is larger than or equal to the temperature threshold, the baking condition is likely to occur, the electromagnetic heating circuit is controlled to stop working at the moment, the condition that the judgment is not timely caused by the hysteresis of temperature conduction is avoided, and the stability of the cooking utensil in the low power process can be improved on the premise that the baking condition is not ensured.
The value range of the power threshold is greater than or equal to 800W and less than or equal to 1500W.
The temperature threshold may be set according to the panel material, and the temperature threshold range given herein may be greater than or equal to 100 ℃ and less than or equal to 150 ℃.
EXAMPLE III
In one embodiment of the present invention, there is provided a cooking appliance including: a heating control circuit; a memory configured to store a computer program; a processor configured to execute a computer program to implement the control method of the cooking appliance as provided in any of the above embodiments, and therefore, the cooking appliance includes all the advantageous effects of the control method of the cooking appliance as provided in any of the above embodiments.
Specifically, as shown in fig. 7, the heating control circuit includes: an electromagnetic heating circuit; the switching tube is connected with the electromagnetic heating circuit; a control device configured to generate a pulse program generator signal; the switching tube driving device is connected with the control device and the switching tube and is configured to drive the switching tube to work according to the pulse generation signal; a synchronous detection circuit 72 connected with the control device and the electromagnetic heating circuit and configured to obtain a duty cycle value of the switching tube and a pulse width of the pulse program generator signal; a panel; and a temperature detection circuit 74 connected to the control device, wherein the temperature detection circuit 74 is configured to detect a surface temperature corresponding to the panel.
In this embodiment, the heating control circuit includes an electromagnetic heating circuit, a switching tube, a control device, a switching tube drive device, and a synchronization detection circuit 72. The electromagnetic heating circuit comprises a coil panel, the switch tube is specifically an IGBT (insulated gate bipolar transistor) switch tube, the control device outputs PPG (photoplethysmography) signals to the switch tube driving device, the switch tube driving device can synchronously output a gate pole (VG) signal to a gate pole of the IGBT, the IGBT is conducted at the moment, and the coil panel is electrified. When the VG signal returns to zero, the IGBT turns off.
When the IGBT is turned off, the current of the coil panel does not disappear immediately, at the moment, the coil panel charges a resonance capacitor connected with the coil panel in parallel, resonance starts, and the voltage of a collector of the IGBT rises.
Synchronous detection circuit 72 includes the comparator, and the both ends of parallelly connected resonance capacitance and coil panel to obtain resonance synchronizing signal, when the resonance to zero point, there is the upset signal in the comparator, and controlling means output PPG signal this moment drives IGBT's next time and switches on. Therefore, the duty cycle value of the switching tube and the pulse width of the pulse program generator signal can be obtained by the synchronous detection circuit 72.
The panel is used for placing the pan, and the pan is after placing the panel, and with the coupling between the electromagnetic heating circuit to realize the heating through electromagnetic induction. Meanwhile, the cookware is in close contact with the panel, so that the temperature of the cookware is basically consistent with that of the panel, and the temperature of the cookware can be determined by arranging the temperature detection circuit 74 to obtain the surface temperature of the panel.
Fig. 7 is a control circuit diagram of a cooking appliance, including: the circuit comprises a current fuse F1, a bridge stack D1, a filter capacitor C1, a resonant capacitor C2, a choke coil L1, a resonant inductor L2 (namely a coil panel), a power tube IGB, a control device U1, a switching tube driving device U2, a synchronous detection circuit 72 (comprising resistors R1, R2, R3 and R4 and a comparator CMP), a temperature detection circuit 74 (comprising a thermistor RT, resistors R5 and R6 and a capacitor C3) and other modules.
Wherein: the control device sends a PPG signal to the switching tube driving device to drive the IBGT to be switched on or switched off, so that IH (electromagnetic) heating is realized.
The control device acquires resonance synchronous signals through the synchronous detection module, and when the resonance reaches zero (an overturning signal exists in CMP), PPG signals are automatically output to drive the IGBT to be switched on next time. The control device controls the PPG signal width according to the power. The higher the power, the larger the PPG signal width.
Fig. 8 is a diagram of driving and resonance waveforms in the operation of the cooking appliance. The control device outputs a PPG signal, and the switching tube driving device outputs a VG signal along with the PPG signal so as to drive the IGBT to work. When the VG signal is zero, the IGBT turns off and starts resonating, at which time the VC voltage rises.
When the IGBT is turned off, the current of the coil disk cannot be immediately extinguished, and therefore the resonant capacitor C2 is charged.
Wherein the single duty cycle T0 of electromagnetic heating comprises: the IGBT time Tppg and the resonance period TS are driven, so that it can be derived that the resonance period TS is T0-Tppg. Where T0 may be obtained by the number of outputs (or resonance times) N of the PPG signal per unit time (e.g. within 1 s). T0 is 1/N.
The resonance system consists of a resonance capacitor, a resonance inductor (coil panel) and a cooker. When the temperature rises, the magnetic permeability of the cookware changes along with the temperature rise, and the coupled inductor LS of the system is further influenced to rise.
Fig. 9 is experimental test data. When the pot temperature rises from 31.8 ℃ to 87.5 ℃, the coupling inductance is increased from 113.6 muH to 119.2 muH.
Fig. 10 is a graph showing the variation of the resonance period TS during the water boiling process of the cooking appliance. The method comprises 3 stages, namely a temperature rise stage, a boiling stage and a dry burning stage.
At the initial stage of water boiling, the temperature of the cooker rises, so that the coupling inductance LS of the cooker rises, and the resonance period of the cooker is increased. In the boiling stage, because the water temperature is maintained at the boiling point (such as 100 ℃), the temperature of the pot changes insignificantly, so that the change of the resonance period is not obvious in the whole boiling period. When the water is dried, the temperature of the pot can be rapidly increased in a very short time, and the corresponding resonance period is increased very quickly.
Therefore, whether dry burning occurs or not can be deduced according to the change of the coupling inductor LS and the change of the resonance period value of the electromagnetic heating circuit, the method is accurate and quick in response, and dry burning can be effectively avoided.
Example four
In one embodiment of the invention, the resonant period follows an increase due to the increase in system coupling inductance as the pot temperature rises. The invention judges the dry burning of the pot tool according to the resonance period value or the change rate.
In the present embodiment, a power threshold of 1000W is used to distinguish between high power and low power.
When the electromagnetic heating circuit operates at high power (for example, the power is 2000W), the variation of the resonant period value and/or the resonant period value is used for dry burning judgment.
When the electromagnetic heating circuit operates at low power (such as 200W), even if the cooker is dried, the temperature of the cooker rises slowly, and whether the cooker is dried or not can be judged by arranging a temperature measuring part (such as a thermistor).
Specifically, the dry burning judgment mode is determined according to the heating power.
And acquiring a resonance period value TS0 of the electromagnetic heating circuit in real time at high power, and determining the variation quantity delta TS. The sampling interval time may be set to 0.1s to 10s here.
The corresponding resonance period value at boiling is preset as TS1, and dry burning is judged to occur when TS0 is larger than TS1 xA and/or delta TS is larger than or equal to B.
Wherein, A is greater than or equal to 1 and less than or equal to 5, B is: b is more than or equal to 0.1 mu s and less than or equal to 10 mu s.
In low power, when the dry burning is preset, the surface temperature threshold of the panel is TEMP1, the surface temperature TEMP0 of the panel is obtained in real time, and if TEMP0 is larger than TEMP1, the dry burning is judged to occur.
When dry burning occurs, the electromagnetic heating circuit is controlled to be powered off.
The specific control flow is shown in fig. 11:
step S1102, acquiring a panel temperature TEMP 0;
step S1104, judging whether the power is larger than a power threshold value; if yes, go to step S1106, otherwise go to step S1110;
step S1106, acquiring a resonance period value TS0 and a change rate Delta TS of the resonance period value;
step S1108, judging whether TS0 is more than TS1 xA and/or delta TS is more than or equal to B; if yes, go to step S1112, otherwise go to step S1114;
step S1110, determining whether TEMP0 > TEMP1 is satisfied; if yes, go to step S1112, otherwise go to step S1114;
step S1112 of stopping heating;
in step S1114, heating is continued.
EXAMPLE five
In an embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and the computer program is executed by a processor to implement the control method of the cooking appliance as provided in any one of the above embodiments, so that the computer-readable storage medium includes all the advantages of the control method of the cooking appliance as provided in any one of the above embodiments, and the details are not repeated herein.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 the present invention, the schematic representations of the terms used above 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 a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A control method of a cooking appliance, wherein the cooking appliance includes an electromagnetic heating circuit, the control method comprising:
determining a resonance period value of the electromagnetic heating circuit, and calculating the variation of the resonance period value;
and controlling the work of the electromagnetic heating circuit according to the resonance period value and/or the change amount of the resonance period value.
2. The method of claim 1, wherein the cooking appliance further comprises a control device and a switch tube; and
the step of determining the value of the resonant period of the electromagnetic heating circuit specifically includes:
acquiring a working period value of the switching tube and acquiring a pulse width of a pulse program generator signal corresponding to the control device;
determining the resonant period value from the duty period value and the pulse width.
3. The method for controlling a cooking appliance according to claim 2, wherein the step of calculating the variation of the resonant period value specifically comprises:
determining a first resonance period value of the electromagnetic heating circuit, and determining a second resonance period value of the electromagnetic heating circuit after delaying a target time length;
and calculating the difference value of the second resonance period value and the first resonance period value, and determining the variation of the resonance period value according to the difference value.
4. The method for controlling a cooking appliance according to claim 1, wherein the step of controlling the operation of the electromagnetic heating circuit according to the value of the resonance period and the variation of the value of the resonance period specifically comprises:
and controlling the electromagnetic heating circuit to stop working based on that the resonance period value is larger than or equal to the resonance period value threshold value and/or the variation of the resonance period value is larger than or equal to the variation threshold value.
5. The method of controlling a cooking appliance according to claim 4, further comprising:
and controlling the electromagnetic heating circuit to maintain the working state based on that the resonance period value is smaller than a resonance period threshold value and the variation of the resonance period value is smaller than a variation threshold value.
6. The control method of the cooking appliance according to any one of claims 1 to 5, further comprising:
acquiring the working power of the electromagnetic heating circuit;
and controlling the work of the electromagnetic heating circuit according to the change of the resonance period value and the resonance period value based on the fact that the work power is larger than or equal to a power threshold value.
7. The method of claim 6, wherein the cooking appliance further comprises a panel and a temperature detection circuit configured to detect a surface temperature corresponding to the panel; and
based on the operating power being less than the power threshold, the control method of the cooking appliance further comprises:
and controlling the electromagnetic heating circuit to stop working based on the fact that the surface temperature is greater than or equal to a temperature threshold value.
8. A cooking appliance, comprising:
a heating control circuit;
a memory configured to store a computer program;
a processor configured to execute the computer program to implement the method of controlling the cooking appliance of any one of claims 1 to 7.
9. The cooking appliance of claim 8, wherein the heating control circuit comprises:
an electromagnetic heating circuit;
the switch tube is connected with the electromagnetic heating circuit;
a control device configured to generate a pulse program generator signal;
the switching tube driving device is connected with the control device and the switching tube and is configured to drive the switching tube to work according to the pulse generation signal;
and the synchronous detection circuit is connected with the control device and the electromagnetic heating circuit and is configured to acquire the working period value of the switching tube and the pulse width of the pulse program generator signal.
10. The cooking appliance of claim 9, further comprising:
a panel;
and the temperature detection circuit is connected with the control device and is configured to detect the surface temperature corresponding to the panel.
11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements a method of controlling a cooking appliance according to any one of claims 1 to 7.
CN202010473794.9A 2020-05-29 2020-05-29 Control method of cooking appliance, cooking appliance and computer readable storage medium Active CN113741228B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010473794.9A CN113741228B (en) 2020-05-29 2020-05-29 Control method of cooking appliance, cooking appliance and computer readable storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010473794.9A CN113741228B (en) 2020-05-29 2020-05-29 Control method of cooking appliance, cooking appliance and computer readable storage medium

Publications (2)

Publication Number Publication Date
CN113741228A true CN113741228A (en) 2021-12-03
CN113741228B CN113741228B (en) 2023-06-27

Family

ID=78724522

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010473794.9A Active CN113741228B (en) 2020-05-29 2020-05-29 Control method of cooking appliance, cooking appliance and computer readable storage medium

Country Status (1)

Country Link
CN (1) CN113741228B (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005310555A (en) * 2004-04-21 2005-11-04 Sharp Corp Electromagnetic cooker
JP2012204119A (en) * 2011-03-25 2012-10-22 Konica Minolta Business Technologies Inc Induction heating apparatus and image forming apparatus equipped with induction heating apparatus
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
CN107990995A (en) * 2017-12-06 2018-05-04 王宝彬 A kind of method for measuring assessment vessel for electromagnetic cooker temperature
CN108720627A (en) * 2017-04-14 2018-11-02 佛山市顺德区美的电热电器制造有限公司 The control method of temperature measuring equipment, temp measuring system and cooking apparatus
CN108991905A (en) * 2017-06-06 2018-12-14 佛山市顺德区美的电热电器制造有限公司 Infrared measurement of temperature method, system and cooking apparatus for cooking apparatus
CN109640424A (en) * 2018-12-18 2019-04-16 珠海格力电器股份有限公司 A kind of electromagnetic heating system method for detecting abnormality, device and readable storage medium storing program for executing
US20190320507A1 (en) * 2016-12-29 2019-10-17 Whirlpool Corporation Electromagnetic cooking device with automatic liquid heating and method of controlling cooking in the electromagnetic cooking device
CN110582135A (en) * 2018-06-08 2019-12-17 佛山市顺德区美的电热电器制造有限公司 Method and device for judging type of cookware and electric cooking appliance
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 (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005310555A (en) * 2004-04-21 2005-11-04 Sharp Corp Electromagnetic cooker
JP2012204119A (en) * 2011-03-25 2012-10-22 Konica Minolta Business Technologies Inc Induction heating apparatus and image forming apparatus equipped with induction heating apparatus
US20190320507A1 (en) * 2016-12-29 2019-10-17 Whirlpool Corporation Electromagnetic cooking device with automatic liquid heating and method of controlling cooking in the electromagnetic cooking device
CN108720627A (en) * 2017-04-14 2018-11-02 佛山市顺德区美的电热电器制造有限公司 The control method of temperature measuring equipment, temp measuring system and cooking apparatus
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
CN108991905A (en) * 2017-06-06 2018-12-14 佛山市顺德区美的电热电器制造有限公司 Infrared measurement of temperature method, system and cooking apparatus for cooking apparatus
CN107990995A (en) * 2017-12-06 2018-05-04 王宝彬 A kind of method for measuring assessment vessel for electromagnetic cooker temperature
CN110582135A (en) * 2018-06-08 2019-12-17 佛山市顺德区美的电热电器制造有限公司 Method and device for judging type of cookware and electric cooking appliance
CN109640424A (en) * 2018-12-18 2019-04-16 珠海格力电器股份有限公司 A kind of electromagnetic heating system method for detecting abnormality, device and readable storage medium storing program for executing
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

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
刘志伟等: "电磁炉自燃事件机理分析及预防措施的探讨", 《机电工程技术》 *
卢华等: "基于中心抽头变压器的倍频感应加热电源", 《电工技术学报》 *
吴丽娟等: "感应加热电源频率跟踪控制电路的设计", 《电子世界》 *

Also Published As

Publication number Publication date
CN113741228B (en) 2023-06-27

Similar Documents

Publication Publication Date Title
CN107013955A (en) Electric cooking pot and its control method
CN107436198B (en) Pot temperature detection system and method and induction cooker
EP1629698A1 (en) Induction cooktop
JP6038343B2 (en) Induction heating cooker
US11064573B2 (en) Determining resonant frequency for quasi-resonant induction cooking devices
CN107131529A (en) A kind of high-power commercial electromagnetic stove and its Poewr control method
JP6038344B2 (en) Induction heating cooker
CN109104781B (en) Electric cooker and heating control device and method thereof
CN110351913B (en) Electromagnetic heating cooking utensil and drive control method and device of IGBT (insulated gate bipolar transistor) tube in same
CN202425085U (en) Control circuit of induction cooker
CN113741228A (en) Control method of cooking appliance, cooking appliance and computer readable storage medium
CN105867450B (en) Cooking equipment and its control method
CN207283855U (en) Electromagnetic heating control device and electromagnetic heating appliance
CN109511189B (en) Heating circuit, induction cooker and driving voltage adjusting method
CN113747619B (en) Control method and control device for cooking appliance, cooking appliance and storage medium
KR102112086B1 (en) Electromagnetic cookware and method for controlling power thereof
JP3966600B2 (en) Electromagnetic cooker
CN112888100B (en) Electromagnetic heating control method of half-bridge electromagnetic appliance and half-bridge electromagnetic appliance
CN113900394A (en) Control method of drive control circuit, drive control circuit and cooking appliance
CN210783903U (en) Cooking utensil
CN111988876B (en) Electromagnetic heating circuit, electromagnetic heating device, drive control method, and heating control method
CN214069551U (en) Electric heating equipment for kitchen and control device thereof
CN112888099B (en) IGBT control method of half-bridge electromagnetic appliance and half-bridge electromagnetic heating appliance
CN117091173A (en) Cooking mode identification method and device, storage medium and multifunctional cooking platform
JP2003151752A (en) Induction cooker

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant