CN113741228B - 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 PDFInfo
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- CN113741228B CN113741228B CN202010473794.9A CN202010473794A CN113741228B CN 113741228 B CN113741228 B CN 113741228B CN 202010473794 A CN202010473794 A CN 202010473794A CN 113741228 B CN113741228 B CN 113741228B
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- 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
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- 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
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- 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
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- 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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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 operation of the electromagnetic heating circuit according to the resonance period value and the variation of the resonance period value. According to 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 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, so that whether the pot is dry burned or not can be quickly and accurately judged, and when the dry burning is judged, the electromagnetic heating circuit is quickly controlled to stop working, thereby effectively preventing the dry burning and effectively improving the safety of the cooking utensil.
Description
Technical Field
The present invention relates to the technical field of cooking appliances, and in particular, to a control method of a 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 electromagnetic heating means. In a conventional IH cooking appliance, such as an induction cooker, as shown in FIG. 1, the temperature of the pot 10 is obtained by providing a thermistor 30, thereby judging whether dry heating occurs. Since the thermistor is arranged under 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, and the dry burning judgment is easy to be untimely, so that the risk of fire exists.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or 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 present 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 including 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 operation of the electromagnetic heating circuit according to the resonance period value and/or the variation of the resonance period value.
In the technical scheme, the cooking utensil can be an IH cooking utensil, namely, electromagnetic induction is generated between a heating coil in an electromagnetic heating circuit and the cooker, so that heating is realized. 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, and whether dry burning occurs or not is judged according to the resonance period value and the variation of the resonance period value of the electromagnetic heating circuit, so that 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 increases, the resonance period value of the electromagnetic heating circuit increases, and the change is immediate and there is little hysteresis. Therefore, when the cooker is dry-burned and the temperature rises rapidly, as a phenomenon, the resonance period value of the electromagnetic heating circuit and the variation of the resonance period value also change immediately. Therefore, whether the cooker is dry-burned or not can be rapidly and accurately judged by detecting the resonance period value and the variation of the resonance period value of the electromagnetic heating circuit in real time, and when the dry-burned is judged, the electromagnetic heating circuit is rapidly controlled to stop working, so that the dry-burned can be effectively prevented, and the safety of the cooking appliance is effectively improved.
In addition, the control method of the cooking utensil in the technical scheme provided by the invention can also have the following additional technical characteristics:
in the technical scheme, the cooking utensil further comprises a control device and a switch tube; and determining a resonance period value of the electromagnetic heating circuit, specifically comprising: acquiring a duty cycle value of a switching tube and acquiring a pulse width of a pulse program generator signal corresponding to a control device; the resonance period value is determined from the duty cycle value and the pulse width.
In this technical scheme, cooking utensil includes controlling means and switch 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.
In any of the above technical solutions, the step of calculating the variation of the resonance 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 a target time length; and calculating a 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 scheme, the variation of the resonance period value is defined as the variation of the resonance period (in μs) within a unit time. For example, with the target duration of 1 second as an interval, the first resonance period value and the second resonance period value are sequentially determined, 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 μs, the second resonance period is 12 μs, the difference is calculated to be 2 μs, and the change amount is determined to be 2 μs.
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 variation of the resonance period value specifically includes: and controlling the electromagnetic heating circuit to stop working based on the resonance period value being greater than or equal to the resonance period value threshold value and/or the variation of the resonance period value being greater than or equal to the variation threshold value.
In the technical scheme, when at least one of the resonance period is larger than or equal to the resonance period threshold value and the variation of the resonance period is larger than the variation threshold value, 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 cooker is prevented from being further increased, the occurrence of dangerous situations such as fire is avoided, and the use safety of the cooking appliance is effectively ensured.
In any of the above technical solutions, the control method of the cooking appliance further includes: and 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 the technical scheme, if the resonance period value is smaller than the resonance period threshold value and the variation of the resonance period is smaller than the variation threshold value, the current resonance period value is in a stable state, the cooking utensil works normally, and no dry burning phenomenon occurs. At the moment, the current working state of the electromagnetic control device is kept without dry combustion protection.
In any of the above technical solutions, the control method of the cooking appliance further includes: acquiring the working power of an electromagnetic heating circuit; and performing a step of controlling the operation of the electromagnetic heating circuit according to the resonance period value and the variation amount of the resonance period value based on the operating power being greater than or equal to the power threshold.
In the technical scheme, when the power of the electromagnetic heating circuit is larger than the power threshold, namely the electromagnetic heating circuit heats with 'high power', the generated heat is higher, so that the temperature change of the cookware and food in the cookware is more severe, and the phenomenon is that dry burning is easy to occur in an extremely short time. At this time, in order to ensure the use safety of the cooking appliance, the electromagnetic heating circuit is controlled to operate according to the resonance period value and the variation of the resonance period value of the electromagnetic heating circuit.
In any of the above technical solutions, the cooking appliance further includes a panel and a temperature detection circuit, the temperature detection circuit being 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 the temperature threshold.
In the technical scheme, the cooking utensil further comprises a panel and a temperature detection circuit, wherein the panel is used for placing the cooker, and the cooker is coupled with the electromagnetic heating circuit after being placed on the panel and is heated through electromagnetic induction. Meanwhile, the cookers are in close contact with the panel, so that the temperature of the cookers is basically consistent with that of the panel, and the temperature of the cookers can be determined by acquiring the surface temperature of the panel through the temperature detection circuit.
Specifically, when the working power of the electromagnetic heating circuit is smaller than the power threshold, that is, the electromagnetic heating circuit heats with 'low power', the generated heat is lower, so that the temperature change of the cookware and the food in the cookware is also more gentle. The phenomenon is that the cooker is not dry-burned in a short time. Meanwhile, due to the characteristics of the electromagnetic heating circuit, when the electromagnetic heating circuit works at lower power, natural fluctuation of the resonance period value can occur, and the fluctuation is possibly irrelevant 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 heating is performed 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 heating is possibly performed, the electromagnetic heating circuit is controlled to stop working at the moment, judgment is not timely caused by hysteresis of temperature conduction, and the stability of the cooking utensil in low power can be improved on the premise that the heating is ensured not to occur.
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 the computer program to implement the control method of the cooking appliance provided in any of the above-mentioned embodiments, so that the cooking appliance includes all the advantages of the control method of the cooking appliance provided in any of the above-mentioned embodiments, and will not be described herein.
In the above technical solution, the heating control circuit includes: an electromagnetic heating circuit; the switch tube is connected with the electromagnetic heating circuit; control means 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 duty cycle 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 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 coil panel is electrified. When the VG signal returns to zero, the IGBT is turned off.
When the IGBT turns off, the current of the coil panel does not immediately disappear, and at this time, the coil panel charges a resonance capacitor connected in parallel with the coil panel, starts resonance, and the collector voltage of the IGBT rises.
The synchronous detection circuit comprises a comparator connected in parallel to the two ends of the resonant capacitor and the coil panel to acquire a resonant synchronous signal, and 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 next conduction of the IGBT. 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 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 the technical scheme, the cooking utensil further comprises a panel and a temperature detection circuit, wherein the panel is used for placing the cooker, and the cooker is coupled with the electromagnetic heating circuit after being placed on the panel and is heated through electromagnetic induction. Meanwhile, the cookers are in close contact with the panel, so that the temperature of the cookers is basically consistent with that of the panel, and the temperature of the cookers can be determined by acquiring the surface temperature of the panel through the temperature detection circuit.
A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which when executed by a processor, implements the control method of a cooking appliance as provided in any of the above-mentioned aspects, and therefore, the computer-readable storage medium includes all the advantageous effects of the control method of a cooking appliance as provided in any of the above-mentioned aspects, which are not described in detail herein.
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 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 illustrates still 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 resonating waveforms in operation of a cooking appliance according to an embodiment of the present invention;
FIG. 9 is a graph of experimental data of pan temperature versus coupled inductance during operation of the cooking appliance according to one embodiment of the present invention;
fig. 10 shows a graph of a variation of a resonance period during a water boiling process of a cooking appliance;
fig. 11 illustrates still another flowchart of a control method 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. 7 is:
72 synchronous detection circuit, 74 temperature detection circuit.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention 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 invention 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, however, 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.
Methods of controlling a cooking appliance, the 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 1
As shown in fig. 2, in one embodiment of the present invention, there is provided a control method of a 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 an electromagnetic heating circuit, and calculating the variation of the resonance period value;
step S204, the operation of the electromagnetic heating circuit is controlled according to the resonance period value and/or the variation of the resonance period value.
In step S202, as shown in fig. 3, the step of determining the resonance period value of the electromagnetic heating circuit specifically includes:
step S302, a working period value of a switching tube is obtained, and a pulse width of a pulse program generator signal corresponding to a control device is obtained;
step S304, a resonance period value is determined according to the duty period value and the pulse width.
As shown in fig. 4, the step of calculating the variation of the resonance 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 a target time length;
step S404, calculating the difference 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.
In step S204, as shown in fig. 5, the step of controlling the operation of the electromagnetic heating circuit according to the resonance period value and the variation amount of the resonance period value specifically includes:
step S502, controlling the electromagnetic heating circuit to maintain a 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;
and step S504, controlling the electromagnetic heating circuit to stop working based on the fact 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 this embodiment, the cooking appliance may be an IH cooking appliance, that is, heating is achieved by electromagnetic induction generated between a heating coil in an electromagnetic heating circuit and a cooker.
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, and whether dry burning occurs or not is judged according to the resonance period value and the variation of the resonance period value of the electromagnetic heating circuit, so that the working of the electromagnetic heating circuit is controlled.
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.
The amount of change in the resonance period value is defined as the unit time length, and the resonance period change amount (in mus) is defined. For example, with the target duration of 1 second as an interval, the first resonance period value and the second resonance period value are sequentially determined, 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 μs, the second resonance period is 12 μs, the difference is calculated to be 2 μs, and the change amount is determined to be 2 μs.
If the resonance period value is smaller than the resonance period threshold value and the variation of the resonance period is smaller than the variation threshold value, the current resonance period value is in a stable state, the cooking utensil works normally, and no dry burning phenomenon occurs. At the moment, the current working state of the electromagnetic control device is kept without dry combustion protection.
When the resonance period is larger than or equal to the resonance period threshold value and at least one of the variation of the resonance period is larger than the variation threshold value, the resonance period value is greatly fluctuated, the possibility of dry heating is provided, the electromagnetic heating circuit is controlled to stop heating at the moment, the temperature of the cooker is prevented from being further increased, the occurrence of dangerous situations such as fire is avoided, and the use safety of the cooking appliance is effectively ensured.
The resonance period threshold is specifically determined according to the product of the resonance period value and a preset constant during boiling. The resonance period value during boiling can be obtained through experiments, and if the resonance period value is TS1 and the preset constant is A, the resonance period threshold value is TS1 xA.
In some embodiments, A is in the range of 1.ltoreq.A.ltoreq.5.
Let the variation threshold corresponding to the variation of the resonance period be B, the range of the value 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 increases, the resonance period value of the electromagnetic heating circuit increases, and the change is immediate and there is little hysteresis. Therefore, when the cooker is dry-burned and the temperature rises rapidly, as a phenomenon, the resonance period value of the electromagnetic heating circuit and the variation of the resonance period value also change immediately. Therefore, whether the cooker is dry-burned or not can be rapidly and accurately judged by detecting the resonance period value and the variation of the resonance period value of the electromagnetic heating circuit in real time, and when the dry-burned is judged, the electromagnetic heating circuit is rapidly controlled to stop working, so that the dry-burned can be effectively prevented, and the safety of the cooking appliance is effectively improved.
Example two
As shown in fig. 6, in one embodiment of the present invention, the control method of the cooking appliance further includes:
step S602, the working power of an electromagnetic heating circuit is obtained;
step S604, based on the operating power being greater than or equal to the power threshold, performs a step of controlling the operation of the electromagnetic heating circuit according to the resonance period value and the variation amount of the resonance period value.
The cooking utensil 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 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 the temperature threshold.
In this embodiment, the cooking appliance further comprises a panel and a temperature detection circuit, wherein the panel is used for placing a cooker, and the cooker is coupled with the electromagnetic heating circuit after being placed on the panel, and heating is achieved through electromagnetic induction. Meanwhile, the cookers are in close contact with the panel, so that the temperature of the cookers is basically consistent with that of the panel, and the temperature of the cookers can be determined by acquiring the surface temperature of the panel through the temperature detection circuit.
When the power of the electromagnetic heating circuit is larger than the power threshold, 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 food materials in the cookware is more severe, and the phenomenon is that dry burning is easy to occur in an extremely short time. At this time, in order to ensure the use safety of the cooking appliance, the electromagnetic heating circuit is controlled to operate according to the resonance period value and the variation of the resonance period value of the electromagnetic heating circuit.
When the working power of the electromagnetic heating circuit is smaller than the power threshold, namely the electromagnetic heating circuit heats with 'low power', the generated heat is lower, so that the temperature change of the cookware and food in the cookware is also more gentle. The phenomenon is that the cooker is not dry-burned in a short time. Meanwhile, due to the characteristics of the electromagnetic heating circuit, when the electromagnetic heating circuit works at lower power, natural fluctuation of the resonance period value can occur, and the fluctuation is possibly irrelevant 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 heating is performed 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 heating is possibly performed, the electromagnetic heating circuit is controlled to stop working at the moment, judgment is not timely caused by hysteresis of temperature conduction, and the stability of the cooking utensil in low power can be improved on the premise that the heating is ensured not to occur.
The value range of the power threshold is more than or equal to 800W and less than or equal to 1500W.
The temperature threshold may be set according to the material of the panel, 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 a cooking appliance as provided in any of the embodiments described above, and therefore the cooking appliance includes all the advantageous effects of the control method of a cooking appliance as provided in any of the embodiments described above.
Specifically, as shown in fig. 7, the heating control circuit includes: an electromagnetic heating circuit; the switch tube is connected with the electromagnetic heating circuit; control means 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 to the control device and the electromagnetic heating circuit, configured to acquire 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, the temperature detection circuit 74 being 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 driving device, and a synchronization detection circuit 72. The electromagnetic heating circuit comprises a coil panel, 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 coil panel is electrified. When the VG signal returns to zero, the IGBT is turned off.
When the IGBT turns off, the current of the coil panel does not immediately disappear, and at this time, the coil panel charges a resonance capacitor connected in parallel with the coil panel, starts resonance, and the collector voltage of the IGBT rises.
The synchronous detection circuit 72 includes a comparator connected in parallel to both ends of the resonant capacitor and the coil panel to obtain a resonant synchronous signal, and when the resonant capacitor reaches a zero point, the comparator has a flip signal, and the control device outputs a PPG signal at this time to drive the IGBT to be turned on next time. The duty cycle value of the switching tube and the pulse width of the pulse program generator signal are thus obtained by the synchronization detection circuit 72.
The panel is used for placing the cookware, and the cookware is coupled with the electromagnetic heating circuit after being placed on the panel and is heated through electromagnetic induction. Meanwhile, the cookers are in close contact with the panel, so that the temperature of the cookers is basically consistent with that of the panel, and the temperature of the cookers can be determined by acquiring the surface temperature of the panel through the temperature detection circuit 74.
Fig. 7 is a control circuit diagram of a cooking appliance, including: current fuse F1, bridge stack D1, filter capacitor C1, resonant capacitor C2, choke L1, resonant inductor L2 (i.e., coil), power tube IGB, control unit U1, switching tube driving unit U2, synchronous detection circuit 72 (including resistors R1, R2, R3 and R4, comparator CMP), temperature detection circuit 74 (including thermistor RT, resistors R5 and R6, 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.
Fig. 8 is a waveform diagram of driving and resonance in operation of the cooking appliance. The control device outputs a PPG signal, and the switching tube driving device follows the VG signal to drive the IGBT to work. When VG signal is zero, IGBT turns off, starts resonance, and VC voltage rises.
When the IGBT turns off, the current of the coil disk cannot immediately disappear, and thus the resonance 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, and thus the resonance period ts=t0—tppg can be derived. Where T0 may be obtained by the number of outputs (or resonances) N of the PPG signal per unit time (e.g. within 1 s). t0=1/N.
The resonant system consists of a resonant capacitor, a resonant inductor (coil panel) and a cooker. When the temperature rises, the magnetic permeability of the cooker changes, and the coupling inductance LS of the system is affected.
Fig. 9 is experimental test data. When the pot temperature was increased from 31.8 ℃ to 87.5 ℃, the coupling inductance increased from 113.6 μh to 119.2 μh.
Fig. 10 is a variation curve of the resonance period TS during the water boiling of the cooking appliance. Specifically, the method can be divided into 3 stages, namely a temperature rising stage, a boiling stage and a dry burning stage.
In the initial stage of boiling, the temperature of the pot is increased, so that the coupling inductance LS is increased, and the resonance period is increased. In the boiling stage, the temperature of water is maintained at the boiling point (such as 100 ℃), and the temperature change of the cooker is not obvious, so that the resonance period change is not obvious during the whole boiling period. When the water is burnt out, the temperature of the pot can rise rapidly in a very short time, and the corresponding resonance period rises very rapidly.
Therefore, whether dry burning occurs can be deduced according to the change of the coupling inductance LS and the change of the resonance period value of the electromagnetic heating circuit, and the method is accurate and quick in reaction and can effectively avoid dry burning.
Example IV
In one embodiment of the invention, the resonant period follows the increase as the pot temperature increases causing the system coupling inductance to increase. According to the invention, the dry heating of the pot is judged through the resonance period value or the change rate.
In this embodiment, the power threshold is 1000W to distinguish between high power and low power.
When the electromagnetic heating circuit operates at high power (for example, the power is 2000W), the resonance period value variation and/or the resonance period value is used for dry combustion judgment.
When the electromagnetic heating circuit operates at low power (such as 200W), the temperature of the cooker rises slowly even if the cooker is dry-burned, and whether the cooker is dry-burned can be judged by arranging a temperature measuring piece (such as a thermistor).
Specifically, the dry combustion judgment mode is determined according to the heating power.
And at high power, acquiring a resonance period value TS0 of the electromagnetic heating circuit in real time, and determining a variation DeltaTS. The sampling interval time may be set to 0.1s to 10s here.
And when the corresponding resonance period value is TS1 and TS0 & gtTS 1 xA is met and/or DeltaTS & gtB is met, judging that dry combustion is generated.
Wherein, the value range of A is more than or equal to 1 and less than or equal to 5, and the value range of B is as follows: b is more than or equal to 0.1 mu s and less than or equal to 10 mu s.
And when the power is low, presetting the surface temperature threshold value of the panel to be TEMP1, acquiring the surface temperature TEMP0 of the panel in real time, and judging that the dry combustion occurs if the temperature TEMP0 is more than TEMP 1.
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 TEMP0;
step S1104, judging whether the power is larger than a power threshold; if yes, go to step S1106, otherwise go to step S1110;
step S1106, obtaining a resonance period value TS0 and a rate of change Δts of the resonance period value;
step S1108, judging whether TS0 is more than TS1 xA and/or DeltaTS is more than or equal to B; if yes, go to step S1112, otherwise go to step S1114;
step S1110, judging whether TEMP0 > TEMP1 is satisfied; if yes, go to step S1112, otherwise go to step S1114;
step S1112, stopping heating;
step S1114, heating is continued.
Example five
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 description of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are orientation or positional relationship based on the drawings, merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention; the terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. 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 invention, 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 the present invention, the 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, 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;
controlling the work of the electromagnetic heating circuit according to the resonance period value and/or the variation of the resonance period value;
further comprises:
acquiring the working power of the electromagnetic heating circuit;
executing the step of controlling the operation of the electromagnetic heating circuit according to the resonance period value and the variation amount of the resonance period value based on the operation power being greater than or equal to a power threshold;
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; and
based on the operating power being less than the power threshold, the control method of the cooking appliance further includes:
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.
2. The control method of a cooking appliance according to claim 1, wherein the cooking appliance further comprises a control device and a switching tube; and
the step of determining the resonance period value 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;
and determining the resonance period value according to the working period value and the pulse width.
3. The method of controlling a cooking appliance according to claim 2, wherein the step of calculating the amount of change in the resonance 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 a target time length;
and calculating a 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.
4. The method of controlling a cooking appliance according to claim 1, wherein the step of controlling the operation of the electromagnetic heating circuit according to the resonance period value and the variation amount of the resonance period value specifically includes:
and controlling the electromagnetic heating circuit to stop working based on the resonance period value being greater than or equal to the resonance period value threshold value and/or the variation of the resonance period value being greater than or equal to the variation threshold value.
5. The control method of a cooking appliance according to claim 4, further comprising:
and controlling the electromagnetic heating circuit to maintain a 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.
6. 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 control method of the cooking appliance of any one of claims 1 to 5.
7. The cooking appliance of claim 6, wherein the heating control circuit comprises:
an electromagnetic heating circuit;
the switch tube is connected with the electromagnetic heating circuit;
control means 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.
8. The cooking appliance of claim 7, 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.
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.
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| JP2005310555A (en) * | 2004-04-21 | 2005-11-04 | Sharp Corp | Electromagnetic cooker |
| JP5365656B2 (en) * | 2011-03-25 | 2013-12-11 | コニカミノルタ株式会社 | Induction heating apparatus and image forming apparatus provided with the induction heating apparatus |
| EP3563635B1 (en) * | 2016-12-29 | 2022-09-28 | 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 |
| CN110582135B (en) * | 2018-06-08 | 2022-03-22 | 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 |
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