CN117412416A - Control method for heating device and heating device - Google Patents

Control method for heating device and heating device Download PDF

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Publication number
CN117412416A
CN117412416A CN202210799101.4A CN202210799101A CN117412416A CN 117412416 A CN117412416 A CN 117412416A CN 202210799101 A CN202210799101 A CN 202210799101A CN 117412416 A CN117412416 A CN 117412416A
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CN
China
Prior art keywords
frequency
electromagnetic wave
wave generating
treated
generating system
Prior art date
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CN202210799101.4A
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Chinese (zh)
Inventor
赵弇锋
韩志强
李春阳
刘勇豪
刘阳
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.)
Qingdao Haier Refrigerator Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Refrigerator Co Ltd
Haier Smart Home Co Ltd
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Publication date
Application filed by Qingdao Haier Refrigerator Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Refrigerator Co Ltd
Priority to CN202210799101.4A priority Critical patent/CN117412416A/en
Publication of CN117412416A publication Critical patent/CN117412416A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/005—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating using irradiation or electric treatment
    • A23L3/01—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating using irradiation or electric treatment using microwaves or dielectric heating
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/36—Freezing; Subsequent thawing; Cooling
    • A23L3/365—Thawing subsequent to freezing

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  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

The invention provides a control method for a heating device and the heating device. The heating device comprises a cavity for placing the object to be treated and an electromagnetic wave generating system for generating electromagnetic waves in the cavity so as to heat the object to be treated. The control method comprises the following steps: frequency matching: if the preset frequency modulation condition is met, controlling the electromagnetic wave generating system to adjust the frequency of the electromagnetic wave generated by the electromagnetic wave generating system so as to meet the preset matching condition; a range determining step: determining a weight comparison range or a frequency comparison range according to the accumulated frequency difference of the frequency adjustment of the preset times before the frequency matching step; parameter adjustment: if the weight value of the object to be treated is out of the weight comparison range or the frequency of the electromagnetic wave generated by the electromagnetic wave generating system is out of the frequency comparison range before the frequency matching step, the electromagnetic wave generating system is controlled to adjust the working parameters of the electromagnetic wave generating system, so that a better heating effect can be obtained no matter which position of the cavity the user places the food in, and the requirement on the user is reduced.

Description

Control method for heating device and heating device
Technical Field
The invention relates to the field of food processing, in particular to a control method for an electromagnetic wave heating device and the heating device.
Background
The quality of the food is maintained during freezing, however frozen food requires thawing prior to processing or consumption. In order to improve the thawing efficiency and to ensure the thawing quality, food is usually thawed by an electromagnetic wave heating device.
However, placing food at the corners of the cavity may cause the resonant frequency of the cavity to differ greatly from the resonant frequency placed at the center of the cavity, such that the control method based on the resonant frequency design at the center of the cavity is inaccurate and the thawing of the food is incomplete.
Disclosure of Invention
It is an object of the first aspect of the present invention to overcome at least one technical disadvantage of the prior art and to provide a control method for a heating device.
A further object of the first aspect of the invention is to reduce the demands on the user.
It is a further object of the first aspect of the present invention to improve the temperature uniformity of the object to be treated.
An object of the second aspect of the present invention is to provide an electromagnetic wave heating apparatus.
According to a first aspect of the present invention, there is provided a control method for a heating apparatus including a chamber for placing an object to be treated, and an electromagnetic wave generating system for generating electromagnetic waves in the chamber to heat the object to be treated, wherein the control method includes:
frequency matching: if the preset frequency modulation condition is met, controlling the electromagnetic wave generating system to adjust the frequency of the electromagnetic wave generated by the electromagnetic wave generating system so as to meet the preset matching condition;
a range determining step: determining a weight comparison range or a frequency comparison range according to the accumulated frequency difference of the frequency adjustment of the preset times in the frequency matching step;
parameter adjustment: and if the weight value of the object to be treated is out of the weight comparison range or the initial frequency for heating the object to be treated is out of the frequency comparison range, controlling the electromagnetic wave generation system to adjust the working parameters of the electromagnetic wave generation system.
Optionally, the operating parameter includes a remaining heating time; and further comprising, prior to the frequency matching step:
a time determining step: determining the residual heating time of the object to be treated; wherein,
in the parameter adjustment step, if the weight value of the object to be treated is outside the weight comparison range or the initial frequency is outside the frequency comparison range, the remaining heating time determined by the time determination step is prolonged.
Optionally, if the weight value of the object to be treated is outside the weight comparison range or the initial frequency is outside the frequency comparison range, the remaining heating time is prolonged by 15% -25%.
Optionally, if the weight value of the object to be treated is within the weight comparison range or the initial frequency is within the frequency comparison range, controlling the electromagnetic wave generating system to operate according to the remaining heating time determined by the time determining step.
Optionally, the operating parameter further comprises power; and the parameter adjusting step further comprises:
and if the accumulated frequency difference of any one or more frequency adjustments in the preset times in the frequency matching step is larger than a first frequency difference threshold, controlling the electromagnetic wave generating system to reduce the power of electromagnetic waves generated by the electromagnetic wave generating system and prolonging the residual heating time on the current basis.
Optionally, in the step of frequency matching, calculating a single frequency difference between the frequency before and after the frequency adjustment, and storing the single frequency difference of the last preset times; and is also provided with
The accumulated frequency difference is the sum of the single frequency differences of corresponding times.
Optionally, if in the frequency matching step, each frequency generated by the electromagnetic wave generating system does not meet the preset matching condition, controlling the electromagnetic wave generating system to generate an electromagnetic wave with a frequency being a minimum value of a preset alternative frequency range.
Optionally, before the frequency matching step, the method further includes:
an initial frequency determining step: determining the initial frequency according to the reflection parameters of the electromagnetic wave generation system;
weight determining: and determining the weight value of the object to be treated according to the initial frequency.
Optionally, the initial frequency determining step further includes:
a reference frequency determining step: controlling the electromagnetic wave generation system to adjust the frequency of electromagnetic waves generated by the electromagnetic wave generation system in a preset alternative frequency range according to a preset first step length, acquiring a reflection parameter corresponding to each frequency generated by the electromagnetic wave generation system, and determining a reference frequency according to the reflection parameters;
an optimal frequency determining step: controlling the electromagnetic wave generating system to adjust the frequency of the electromagnetic wave generated by the electromagnetic wave generating system in a carefully selected frequency range according to a preset second step length, obtaining a reflection parameter corresponding to each frequency generated by the electromagnetic wave generating system, and determining the optimal frequency as the initial frequency according to the reflection parameter; wherein,
the selected frequency range is a frequency within a range having the absolute value of the first step as a radius based on the reference frequency; and is also provided with
The absolute value of the second step is smaller than the absolute value of the first step.
According to a second aspect of the present invention, there is provided a heating device comprising:
the cavity is used for placing an object to be treated;
an electromagnetic wave generating system for generating electromagnetic waves in the cavity to heat the object to be treated; and
a controller configured to perform any of the control methods described above.
According to the invention, the placement position of the object to be treated is verified according to the accumulated frequency difference of the frequency adjustment of the preset times in the frequency matching step, and the working parameters of the electromagnetic wave generation system are further adjusted, so that no matter which position of the cavity the user places the food in, a better heating effect can be obtained, and the requirement on the user is reduced.
Further, the invention determines whether the object to be processed has a hot spot or not through the accumulated frequency difference of frequency adjustment at any time or times in the preset frequency in the frequency matching step, and controls the electromagnetic wave generating system to reduce the power of the electromagnetic wave generated by the electromagnetic wave generating system and prolong the residual heating time under the condition that the accumulated frequency difference is larger than the first frequency difference threshold value, thereby effectively avoiding the continuous and rapid heating of the hot spot part, improving the temperature uniformity of the object to be processed, and being particularly suitable for food thawing.
Furthermore, the invention searches and determines the reference frequency to represent the rough position of the optimal frequency by a larger step length, and searches and determines the optimal frequency nearby the reference frequency by a smaller step length.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
FIG. 1 is a schematic block diagram of a heating apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic block diagram of the controller of FIG. 1;
FIG. 3 is a schematic flow chart of a control method for a heating device according to one embodiment of the invention;
fig. 4 is a schematic detailed flowchart of a control method for a heating apparatus according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic structural view of a heating apparatus 100 according to an embodiment of the present invention. Referring to fig. 1, the heating apparatus 100 may include a cavity 110, an electromagnetic wave generation system, and a controller 140.
The cavity 110 may include a barrel and a door. The cartridge may be used to hold the object 150 to be treated. The door body can be used for opening and closing the taking and placing opening of the cylinder body.
The cylinder and door may be provided with electromagnetic shielding features to reduce electromagnetic leakage. Wherein, the barrel can be made of metal and is arranged to be grounded.
The electromagnetic wave generating system may be at least partially disposed in the cavity 110 or connected to the cavity 110, so as to generate electromagnetic waves in the cavity 110 and heat the object 150 to be processed.
The electromagnetic wave generating system may include an electromagnetic wave generating module 120, a radiation antenna 130 electrically connected with the electromagnetic wave generating module 120, and a power supply for supplying power to the electromagnetic wave generating module 120.
The electromagnetic wave generation module 120 may be configured to generate an electromagnetic wave signal. The radiation antenna 130 may be disposed in the cavity 110 to generate electromagnetic waves in the cavity 110. The electromagnetic wave generation module 120 may include a variable frequency source and a power amplifier, among other things.
Fig. 2 is a schematic structural diagram of the controller 140 in fig. 1. Referring to fig. 2, the controller 140 may include a processing unit 141 and a storage unit 142. The storage unit 142 stores a computer program 143, and the computer program 143 is used to implement the control method according to the embodiment of the present invention when executed by the processing unit 141.
The processing unit 141 may be configured to control the electromagnetic wave generating module 120 to adjust the frequency of the electromagnetic wave signal generated by the electromagnetic wave generating module to meet the preset matching condition, thereby improving the heating efficiency if the preset frequency modulation condition is met during the heating process.
The preset frequency modulation condition may be that the reflection parameter of the electromagnetic wave generating system is greater than a preset frequency modulation reflection threshold value, so as to ensure heating efficiency.
The preset matching condition may be that the reflection parameter of the electromagnetic wave generating system has a concave inflection point and the reflection parameter is smaller than a preset matching reflection threshold. The processing unit 141 may be configured to control the electromagnetic wave generating module 120 to generate an electromagnetic wave signal of a frequency corresponding to the inflection point to further improve heating efficiency. The matching reflection threshold may be less than the fm reflection threshold.
The reflection parameter may be return loss S11. The reflection parameter may also be a reflection power value of the electromagnetic wave signal reflected back to the electromagnetic wave generation module 120.
In particular, the processing unit 141 may be configured to determine the weight comparison range R or the frequency comparison range according to the accumulated frequency difference Δf of the previous frequency adjustment, and control the electromagnetic wave generating system to adjust the operation parameters thereof in case that the weight value of the object to be processed 150 is outside the weight comparison range R or the initial frequency of heating the object to be processed 150 is outside the frequency comparison range.
The heating device 100 of the invention verifies the placement position of the object to be treated 150 according to the accumulated frequency difference Δf of the frequency adjustment of the pre-preset times in the heating process, and further adjusts the working parameters of the electromagnetic wave generating system, so that no matter which position of the cavity 110 the object to be treated 150 is placed by the user, a better heating effect can be obtained, and the requirement on the user is reduced.
In some embodiments, the processing unit 141 may be configured to calculate the single frequency difference before and after the frequency adjustment while controlling the electromagnetic wave generating module 120 to adjust the frequency of the electromagnetic wave signal generated thereby, and store the single frequency difference of the last preset number of times in the storage unit 142, so as to determine the accumulated frequency difference Δf of any one or more frequency adjustments in time.
The single frequency difference is the absolute value of the difference between the frequency before the frequency adjustment and the frequency after the frequency adjustment. The accumulated frequency difference deltaf is the sum of the single frequency differences of the corresponding times.
An embodiment of the heating apparatus according to the present invention will be described in detail below by taking an example of adjusting the operation parameters of the electromagnetic wave generating system according to the weight value and the weight comparison range R of the object to be treated 150.
In some embodiments, the processing unit 141 may be configured to determine the remaining heating time of the object 150 and to extend the remaining heating time to avoid incomplete heating if the weight value of the object 150 is outside the weight comparison range R.
If the weight value of the object 150 to be treated is outside the weight comparison range R, the remaining heating time may be extended by 15% to 25% based on the current remaining time. For example, 15%, 20%, or 25%.
In some further embodiments, the processing unit 141 may be further configured to control the electromagnetic wave generating system to operate according to the current remaining heating time, i.e. the remaining heating time is temporarily not adjusted, in case the weight value of the object to be processed 150 is within the weight comparison range R, so as to ensure the heating effect.
In some embodiments, the processing unit 141 may be configured to control the electromagnetic wave generating module 120 to generate the electromagnetic wave signal having the frequency that is the minimum value of the preset alternative frequency range and stop calculating the accumulated frequency difference to ensure the heating effect in case that each frequency does not satisfy the preset matching condition.
An alternative frequency range may be 350MHz to 500MHz. Further, the alternative frequency range may be 400MHz to 460MHz to further improve the temperature uniformity of the object 150 to be treated.
In some embodiments, the processing unit 141 may be configured to adjust the frequency of the integrated frequency difference Δf to be greater than the first frequency difference threshold D any one or more times within a preset number of times during the heating process 1 In the case of (1), the electromagnetic wave generating module 120 is controlled to reduce the power of the electromagnetic wave signal generated by the electromagnetic wave generating module and extend the remaining heating time based on the current remaining time, so as to effectively avoid the hot spot portion from continuously and rapidly heating up and improve the temperature uniformity of the object to be treated 150.
In some further embodiments, the cumulative frequency difference Δf of any one or more frequency adjustments within the preset number of times is greater than the first frequency difference threshold D 1 In this case, the power of the electromagnetic wave signal may be reduced by a smaller proportion than the remaining heating time to stop heating the object to be treated 150 in a state desired by the user while improving the temperature uniformity.
Illustratively, the power of the electromagnetic wave signal may be reduced by 20% -40%, such as 20%, 30%, or 40%. The remaining heating time may be extended by 35% to 55%, such as 35%, 40%, 45%, or 55%.
In some embodiments, the processing unit 141 may be configured to adjust the frequency a predetermined number of times by comparing the accumulated frequency difference Δf with the second frequency difference threshold D 2 In the case of (1), the electromagnetic wave generation module 120 is controlled to stop immediately or after a preset time of continued operation, to stop heating in time when the object to be treated 150 has finished thawing or the heating device 100 fails, to prevent the object to be treated 150 from being excessively heated and to improve the safety of the heating device 100. Wherein the second frequency difference threshold D 2 Can be smaller than the first frequency difference threshold D 1 。
In some further embodiments, the processing unit 141 may be configured to determine an initial frequency based on the reflection parameters of the electromagnetic wave generating system at the beginning of heating, and to determine the weight value of the object to be treated 150 and the first frequency difference threshold D based on the initial frequency 1 And a second frequency difference threshold D 2 . Wherein the first frequency difference threshold D 1 And a second frequency difference threshold D 2 Positively correlated to the initial frequency to accommodate different types of dimensional parameters of the object 150 to be treated.
The processing unit 141 may be further configured to first determine a reference frequency f for searching for an optimal frequency b And then determining the optimal frequency f suitable for heating g As an initial frequency to increase the determined optimal frequency f g Thereby reducing the total heating time, reducing unnecessary energy loss, and improving the energy efficiency ratio of the heating apparatus 100.
Specifically, the processing unit 141 may be configured to control the electromagnetic wave generation module 120 to be presetFirst step length W 1 Adjusting the frequency of the electromagnetic wave signal generated by the electromagnetic wave generating module 120 within a preset alternative frequency range, acquiring the reflection parameter corresponding to each frequency generated by the electromagnetic wave generating module 120 and determining the reference frequency f according to the reflection parameter b 。
The processing unit 141 may be further configured to control the electromagnetic wave generation module 120 to follow a preset second step W 2 Adjusting the frequency of the electromagnetic wave signal generated by the electromagnetic wave generating module 120 within a selected frequency range, acquiring the reflection parameter corresponding to each frequency generated by the electromagnetic wave generating module 120 and determining the optimal frequency f according to the reflection parameters g . Wherein the selected frequency range can be based on the reference frequency f b In a first step length W 1 Is the frequency in the range of the radius.
Second step W 2 The absolute value of (a) may be smaller than the first step W 1 Is the absolute value of (c).
In some embodiments, processing unit 141 may be configured to increment search reference frequency f from the minimum value of the candidate frequency range b . Namely, a first step length W 1 Is a positive number.
In some alternative embodiments, the processing unit 141 may also be configured to decrement the search reference frequency f from the maximum value of the alternative frequency range b . Namely, a first step length W 1 And is negative.
First step length W 1 The absolute value of (2) may be 5MHz to 10MHz. For example, 5MHz, 7MHz, or 10MHz.
Second step W 2 The absolute value of (2) may be 1MHz to 2MHz. For example, 1MHz, 1.5MHz, or 2MHz.
In some further embodiments, the processing unit 141 may be configured to control the electromagnetic wave generating module 120 to adjust the frequency of the electromagnetic wave signal generated by the electromagnetic wave generating module to a reflection parameter smaller than a preset first reflection threshold S 1 And the reflection parameter is smaller than the first reflection threshold S 1 Is determined as a reference frequency f b . That is, the processing unit 141 will first appear that the reflection parameter is less than the first reflection threshold S 1 Is determined as a reference frequency f b To obtain the accurate optimal frequency f g At the same time as further improving the determinationOptimum frequency f g Is not limited to the above-described embodiments.
In some further embodiments, the processing unit 141 may be configured to generate a reflection parameter corresponding to each frequency of the electromagnetic wave generating module 120 greater than the first reflection threshold S 1 In the case of (a), the electromagnetic wave generating module 120 is controlled to stop working, and a visual signal and/or an audible signal is sent to prompt a fault to a user, so that the heating effect is not bad and the electromagnetic wave generating system is prevented from being damaged.
In some further embodiments, the processing unit 141 may be configured to control the electromagnetic wave generating module 120 to adjust the frequency of the electromagnetic wave signal generated by the electromagnetic wave generating module to an inflection point where the reflection parameter is concave, and determine the frequency corresponding to the inflection point as the optimal frequency f g So as to obtain an excellent heating effect. Optimum frequency f g The reflection parameter corresponding to the former frequency and the reflection parameter corresponding to the latter frequency are both larger than the optimal frequency f g I.e. with a concave inflection point).
In some further embodiments, the processing unit 141 may be configured to determine the self-reference frequency f first b The electromagnetic wave generating module 120 is further controlled to adjust the frequency of the electromagnetic wave signal generated by the electromagnetic wave generating module to the inflection point where the reflection parameter is concave in the searching direction of the high-frequency or low-frequency searching.
In some exemplary embodiments, the processing unit 141 may be configured to obtain the specific reference frequencies f, respectively b Greater than the second step length W 2 Frequency sum of (2) to reference frequency f b Less than the second step length W 2 Comparing the magnitudes of the two reflection parameters, and determining the direction corresponding to the frequency with the smaller reflection parameter as the searching direction.
In some further embodiments, the processing unit 141 may be configured to be at an optimal frequency f g The corresponding reflection parameter is larger than a preset second reflection threshold S 2 In the case of (a), the electromagnetic wave generation module 120 is controlled to stop working and give out a visual signal and/or an audible signal to prompt a fault so as to avoid bad heating effect. Second reflection threshold S 2 Can be smaller than the first reflection threshold S 1 。
In some further embodiments, the processing unit 141 may be configured to be at an optimal frequency f g Greater than or equal to a preset minimum frequency threshold f i And is less than or equal to a preset maximum frequency threshold f a In the case of (a) according to the optimum frequency f g The remaining heating time is determined.
The processing unit 141 may be configured to count down according to the remaining heating time, and when the remaining heating time is 0, control the electromagnetic wave generating module 120 to stop working, and issue a visual signal and/or an audible signal to prompt that the heating is completed.
In some further embodiments, the processing unit 141 may be configured to be at an optimal frequency f g Less than the minimum frequency threshold f i In the case of (a), the electromagnetic wave generation module 120 is controlled to stop working and send out a visual signal and/or an audible signal to prompt overload so as to avoid overlong heating time.
Minimum frequency threshold f i The difference from the minimum of the alternative frequency range may be 15% to 30% of the difference between the maximum and minimum of the alternative frequency range. For example, 15%, 20%, 25%, or 30%.
In some further embodiments, the processing unit 141 may be configured to be at an optimal frequency f g Greater than the maximum frequency threshold f a In the event that the electromagnetic wave generation module 120 is controlled to cease operation and emit a visual signal and/or audible signal to indicate no load, to avoid damaging the electromagnetic wave generation system.
Maximum value of alternative frequency range and maximum frequency threshold f a The difference between the maximum and minimum of the alternative frequency ranges may be 5% to 10%. For example, 5%, 7%, 8%, or 10%.
It should be noted that the heating device 100 of the present invention is particularly suitable for application to a refrigerator, and the cavity 110 may be disposed in a storage compartment of the refrigerator.
Fig. 3 is a schematic flow chart of a control method for the heating apparatus 100 according to an embodiment of the present invention. Referring to fig. 3, the control method for the heating apparatus 100 of the present invention may include the steps of:
frequency matching step (step S302): if the preset frequency modulation condition is met, controlling the electromagnetic wave generating system to adjust the frequency of the electromagnetic wave generated by the electromagnetic wave generating system so as to meet the preset matching condition;
range determination step (step S304): determining a weight comparison range R or a frequency comparison range according to the accumulated frequency difference delta f of frequency adjustment of the preset times before the frequency matching step;
parameter adjustment step (step S306): if the weight value of the object 150 is outside the weight comparison range R or the initial frequency of heating the object 150 is outside the frequency comparison range, the electromagnetic wave generating system is controlled to adjust the working parameters.
The control method of the invention verifies the placement position of the object to be treated 150 according to the accumulated frequency difference deltaf of the frequency adjustment of the pre-preset times in the heating process, and further adjusts the working parameters of the electromagnetic wave generating system, so that no matter which position of the cavity 110 the object to be treated 150 is placed by the user, a better heating effect can be obtained, and the requirement on the user is reduced.
The preset frequency modulation condition may be that the reflection parameter of the electromagnetic wave generating system is greater than a preset frequency modulation reflection threshold value, so as to ensure heating efficiency.
The preset matching condition may be that the reflection parameter of the electromagnetic wave generating system has a concave inflection point and the reflection parameter is smaller than a preset matching reflection threshold value, so that the electromagnetic wave generating module 120 generates an electromagnetic wave signal with a frequency corresponding to the inflection point, thereby further improving the heating efficiency. The matching reflection threshold may be less than the fm reflection threshold.
The reflection parameter may be return loss S11. The reflection parameter may also be a reflection power value of the electromagnetic wave signal reflected back to the electromagnetic wave generation module 120.
In some embodiments, the frequency matching step may further comprise: and calculating the single frequency difference before and after frequency adjustment, and storing the single frequency difference of the latest preset times so as to determine the accumulated frequency difference deltaf of any one or more frequency adjustments in time.
The single frequency difference is the absolute value of the difference between the frequency before the frequency adjustment and the frequency after the frequency adjustment. The accumulated frequency difference deltaf is the sum of the single frequency differences of the corresponding times.
An embodiment of the control method of the present invention will be described in detail below by taking an example of adjusting the operation parameters of the electromagnetic wave generating system according to the weight value and the weight comparison range R of the object to be treated 150.
In some embodiments, the operating parameters may include a remaining heating time. The frequency matching step is preceded by a time determining step for determining a remaining heating time of the object to be treated.
In the parameter adjustment step, if the weight value of the object to be processed 150 is outside the weight comparison range R, the remaining heating time determined in the time determination step is extended to avoid incomplete heating.
If the weight value of the object 150 to be treated is outside the weight comparison range R, the remaining heating time may be extended by 15% to 25% based on the current remaining time. For example, 15%, 20%, or 25%.
In some further embodiments, if the weight value of the object to be treated 150 is within the weight comparison range R, the electromagnetic wave generating system is controlled to operate according to the current remaining heating time, i.e. the remaining heating time is temporarily not adjusted, so as to ensure the heating effect.
In some embodiments, if each electromagnetic wave signal generated by the electromagnetic wave generating module 120 does not meet the preset matching condition in the frequency matching step, the electromagnetic wave generating module 120 is controlled to generate an electromagnetic wave signal with a frequency being the minimum value of the preset alternative frequency range and stop calculating the accumulated frequency difference, so as to ensure the heating effect.
An alternative frequency range may be 350MHz to 500MHz. Further, the alternative frequency range may be 400MHz to 460MHz to further improve the temperature uniformity of the object 150 to be treated.
In some embodiments, the parameter adjusting step further comprises: if the accumulated frequency difference delta f of any one or more frequency adjustments within the preset times is greater than the first frequency difference threshold D 1 The electromagnetic wave generating module 120 is controlled to reduce the power of the electromagnetic wave signal generated by the electromagnetic wave generating module and prolong the residual heating time based on the current residual time so as to effectively avoid the continuous and rapid heating of the hot spot part and improve the temperature uniformity of the object to be treated 150。
In some further embodiments, if the accumulated frequency difference Δf of any one or more frequency adjustments within the preset number of times is greater than the first frequency difference threshold D 1 The rate of decrease in the power of the electromagnetic wave signal may be smaller than the rate of extension of the remaining heating time to stop the heating of the object to be treated 150 in a state desired by the user while improving the temperature uniformity.
Illustratively, the power of the electromagnetic wave signal may be reduced by 20% -40%, such as 20%, 30%, or 40%. The remaining heating time may be extended by 35% to 55%, such as 35%, 40%, 45%, or 55%.
In some embodiments, the control method of the present invention may further include a special termination step. The special termination step can be that the accumulated frequency difference delta f of the frequency adjustment of the preset times in the frequency matching step is smaller than the second frequency difference threshold D 2 In the case of (1), the electromagnetic wave generation module 120 is controlled to stop immediately or after a preset time of continued operation, to stop heating in time when the object to be treated 150 has finished thawing or the heating device 100 fails, to prevent the object to be treated 150 from being excessively heated and to improve the safety of the heating device 100. Wherein the second frequency offset threshold may be less than the first frequency offset threshold.
In some further embodiments, the control method of the present invention may further comprise an initial frequency determining step, a weight determining step, and a threshold determining step before the frequency matching step.
The initial frequency determining step may determine an initial frequency of heating the object 150 to be treated according to the reflection parameter of the electromagnetic wave generating system at the start of heating.
The weight determining step may determine a weight value of the object 150 to be treated according to the initial frequency.
The threshold determining step may determine a first frequency difference threshold D based on the initial frequency 1 And a second frequency difference threshold D 2 . Wherein the first frequency difference threshold D 1 And a second frequency difference threshold D 2 Positively correlated to the initial frequency to accommodate different types of dimensional parameters of the object 150 to be treated.
The initial frequency determination step may further include a reference frequencyA determining step and an optimal frequency determining step, a reference frequency f for searching an optimal frequency is determined first b And then determining the optimal frequency f suitable for heating g As an initial frequency to increase the determined optimal frequency f g Thereby reducing the total heating time, reducing unnecessary energy loss, and improving the energy efficiency ratio of the heating apparatus 100.
The reference frequency determining step may include: the electromagnetic wave generation module 120 is controlled according to a preset first step W 1 Adjusting the frequency of the electromagnetic wave signal generated by the electromagnetic wave generating module 120 within a preset alternative frequency range, acquiring the reflection parameter corresponding to each frequency generated by the electromagnetic wave generating module 120, and determining the reference frequency f according to the reflection parameters b 。
The optimal frequency determining step may include: controlling the electromagnetic wave generating module 120 to follow a preset second step length W 2 Adjusting the frequency of the electromagnetic wave signal generated by the electromagnetic wave generating module 120 within a selected frequency range, acquiring the reflection parameter corresponding to each frequency generated by the electromagnetic wave generating module 120, and determining the optimal frequency f according to the reflection parameters g As an initial frequency.
The selected frequency range may be based on the reference frequency f b In a first step length W 1 Is the frequency in the range of the radius. Second step W 2 The absolute value of (a) may be smaller than the first step W 1 Is the absolute value of (c).
In some embodiments, the reference frequency f is determined b Can increment the search reference frequency f from the minimum value of the alternative frequency range in the process of (a) b . Namely, a first step length W 1 Is a positive number.
In some alternative embodiments, the reference frequency f is determined b The search reference frequency f may be decremented from the maximum value of the alternative frequency range in the process of (a) b . Namely, a first step length W 1 And is negative.
First step length W 1 The absolute value of (2) may be 5MHz to 10MHz. For example, 5MHz, 7MHz, or 10MHz.
Second step W 2 The absolute value of (2) may be 1MHz to 2MHz. For example, 1MHz, 1.5MHz, or 2MHz.
At some of the stepsIn one embodiment, in the optimal frequency determining step, the electromagnetic wave generating module 120 is controlled to adjust the frequency of the electromagnetic wave signal generated by the electromagnetic wave generating module to a value that the reflection parameter is smaller than the preset first reflection threshold value S 1 And the reflection parameter is smaller than the first reflection threshold S 1 Is determined as a reference frequency f b . That is, the first occurrence of the reflection parameter is smaller than the first reflection threshold S 1 Is determined as a reference frequency f b To obtain the accurate optimal frequency f g At the same time as the determination of the optimum frequency f is further improved g Is not limited to the above-described embodiments.
In some further embodiments, if the reflection parameter corresponding to each frequency generated by the electromagnetic wave generating module 120 is greater than the first reflection threshold S 1 The electromagnetic wave generation module 120 is controlled to stop working, and a visual signal and/or an audible signal is sent to prompt a fault to a user so as to avoid the bad heating effect and damage to the electromagnetic wave generation system.
In some further embodiments, in the optimal frequency determining step, the electromagnetic wave generating module 120 is controlled to adjust the frequency of the electromagnetic wave signal generated thereby to an inflection point where the reflection parameter is concave, and the frequency corresponding to the inflection point is determined as the optimal frequency f g So as to obtain an excellent heating effect. Optimum frequency f g The reflection parameter corresponding to the former frequency and the reflection parameter corresponding to the latter frequency are both larger than the optimal frequency f g I.e. with a concave inflection point).
In some further embodiments, in the optimum frequency determining step, the self-reference frequency f may be determined first b The electromagnetic wave generating module 120 is further controlled to adjust the frequency of the electromagnetic wave signal generated by the electromagnetic wave generating module to the inflection point where the reflection parameter is concave in the searching direction of the high-frequency or low-frequency searching.
Illustratively, the specific reference frequencies f may be obtained separately b Greater than the second step length W 2 Frequency sum of (2) to reference frequency f b Less than the second step length W 2 Comparing the magnitudes of the two reflection parameters, and determining the direction corresponding to the frequency with the smaller reflection parameter as the searching direction.
In some further embodiments, if the optimal frequency f g The corresponding reflection parameter is larger than a preset second reflection threshold S 2 The electromagnetic wave generation module 120 is controlled to stop working and send out visual signals and/or audible signals to prompt faults so as to avoid bad heating effect. Second reflection threshold S 2 Can be smaller than the first reflection threshold S 1 。
In some further embodiments, if the optimal frequency f g Greater than or equal to a preset minimum frequency threshold f i And is less than or equal to a preset maximum frequency threshold f a According to the optimum frequency f g The remaining heating time is determined, and when the remaining heating time is 0, the electromagnetic wave generating module 120 is controlled to stop working, and a visual signal and/or an audible signal is sent to prompt that the heating is completed.
In some further embodiments, if the optimal frequency f g Less than the minimum frequency threshold f i The electromagnetic wave generation module 120 is controlled to stop working and send out visual signals and/or audible signals to prompt overload so as to avoid overlong heating time.
Minimum frequency threshold f i The difference from the minimum of the alternative frequency range may be 15% to 30% of the difference between the maximum and minimum of the alternative frequency range. For example, 15%, 20%, 25%, or 30%.
In some further embodiments, if the optimal frequency f g Greater than the maximum frequency threshold f a The electromagnetic wave generation module 120 is controlled to stop working and send out a visual signal and/or an audible signal to prompt no load so as to avoid damaging the electromagnetic wave generation system.
Maximum value of alternative frequency range and maximum frequency threshold f a The difference between the maximum and minimum of the alternative frequency ranges may be 5% to 10%. For example, 5%, 7%, 8%, or 10%.
Fig. 4 is a schematic detailed flowchart of a control method for the heating apparatus 100 according to one embodiment of the present invention (in fig. 4, "Y" means "yes"; "N" means "no"). Referring to fig. 4, the control method for the heating apparatus 100 of the present invention may include the following detailed steps:
step S402: controlling the electromagnetic wave generating system according to a preset first step length W 1 Adjusting the frequency of the electromagnetic wave generated by the electromagnetic wave generating system in a preset alternative frequency range, and acquiring a reflection parameter corresponding to each frequency generated by the electromagnetic wave generating system;
step S404: judging whether the reflection parameter is smaller than the first reflection threshold S 1 . If yes, go to step S406; if not, go to step S408.
Step S406: will first appear to be smaller than the first reflection threshold S 1 Frequency-determining reference frequency f corresponding to the reflection parameter of (a) b . Step S410 is performed.
Step S408: and controlling the electromagnetic wave generating system to stop working, and sending out a visual signal and/or an audible signal to prompt fault.
Step S410: in a selected frequency range according to a second step W 2 Controlling an electromagnetic wave generating system to regulate the frequency of electromagnetic waves generated by the electromagnetic wave generating system, acquiring a reflection parameter corresponding to each frequency to an inflection point with concave reflection coefficient, and determining the frequency corresponding to the inflection point as an optimal frequency f g 。
Step S412: according to the optimum frequency f g Determining a remaining heating time, a first frequency difference threshold D 1 And a second frequency difference threshold D 2 。
Step S414: if the preset frequency modulation condition is met, controlling the electromagnetic wave generating system to adjust the frequency of the electromagnetic wave generated by the electromagnetic wave generating system so as to meet the preset matching condition, calculating the single frequency difference between the frequency after adjustment and the frequency before adjustment, and storing the single frequency difference of the latest preset times.
Step S416: and calculating the accumulated frequency difference delta f of frequency adjustment in the preset times according to the stored single frequency difference, and comparing the range R according to the determined weight.
Step S418: whether the weight value of the object 150 to be processed is within the weight comparison range R is determined. If yes, go to step S422; if not, go to step S420.
Step S420: the remaining heating time determined by step S412 is extended.
Step S422: according to storageCalculating the accumulated frequency difference delta f of any one or more frequency adjustments in the preset times by the single frequency difference, and judging whether the accumulated frequency difference delta f of any one or more frequency adjustments in the preset times is larger than a first frequency difference threshold D or not 1 . If yes, go to step S424; if not, go to step S426.
Step S424: the electromagnetic wave generating system is controlled to reduce the power of the electromagnetic wave generated by the electromagnetic wave generating system and prolong the residual heating time. Returning to step S422.
Step S426: judging whether the accumulated frequency difference delta f of the frequency adjustment of the preset times is smaller than a second frequency difference threshold D 2 . If yes, go to step S428; if not, go to step S430.
Step S428: and controlling the electromagnetic wave generating system to stop working.
Step S430: it is determined whether the remaining heating time is equal to 0. If yes, go to step S428; if not, return to step S422.
By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A control method for a heating apparatus including a chamber for placing an object to be treated, and an electromagnetic wave generation system for generating electromagnetic waves in the chamber to heat the object to be treated, wherein the control method comprises:
frequency matching: if the preset frequency modulation condition is met, controlling the electromagnetic wave generating system to adjust the frequency of the electromagnetic wave generated by the electromagnetic wave generating system so as to meet the preset matching condition;
a range determining step: determining a weight comparison range or a frequency comparison range according to the accumulated frequency difference of the frequency adjustment of the preset times in the frequency matching step;
parameter adjustment: and if the weight value of the object to be treated is out of the weight comparison range or the initial frequency for heating the object to be treated is out of the frequency comparison range, controlling the electromagnetic wave generation system to adjust the working parameters of the electromagnetic wave generation system.
2. The control method of claim 1, wherein the operating parameter comprises a remaining heating time; and further comprising, prior to the frequency matching step:
a time determining step: determining the residual heating time of the object to be treated; wherein,
in the parameter adjustment step, if the weight value of the object to be treated is outside the weight comparison range or the initial frequency is outside the frequency comparison range, the remaining heating time determined by the time determination step is prolonged.
3. The control method according to claim 2, wherein,
and if the weight value of the object to be treated is outside the weight comparison range or the initial frequency is outside the frequency comparison range, the residual heating time is prolonged by 15-25%.
4. The control method according to claim 2, wherein,
and if the weight value of the object to be treated is in the weight comparison range or the initial frequency is in the frequency comparison range, controlling the electromagnetic wave generating system to work according to the residual heating time determined by the time determining step.
5. The control method of claim 2, wherein the operating parameter further comprises power; and the parameter adjusting step further comprises:
and if the accumulated frequency difference of any one or more frequency adjustments in the preset times in the frequency matching step is larger than a first frequency difference threshold, controlling the electromagnetic wave generating system to reduce the power of electromagnetic waves generated by the electromagnetic wave generating system and prolonging the residual heating time on the current basis.
6. The control method according to claim 1, wherein,
in the frequency matching step, calculating a single frequency difference before and after frequency adjustment, and storing the single frequency difference of the last preset times; and is also provided with
The accumulated frequency difference is the sum of the single frequency differences of corresponding times.
7. The control method according to claim 1, wherein,
and if each frequency generated by the electromagnetic wave generating system does not meet the preset matching condition in the frequency matching step, controlling the electromagnetic wave generating system to generate the electromagnetic wave with the frequency being the minimum value of the preset alternative frequency range.
8. The control method according to claim 1, wherein before the frequency matching step, further comprising:
an initial frequency determining step: determining the initial frequency according to the reflection parameters of the electromagnetic wave generation system;
weight determining: and determining the weight value of the object to be treated according to the initial frequency.
9. The control method according to claim 8, wherein the initial frequency determining step further includes:
a reference frequency determining step: controlling the electromagnetic wave generation system to adjust the frequency of electromagnetic waves generated by the electromagnetic wave generation system in a preset alternative frequency range according to a preset first step length, acquiring a reflection parameter corresponding to each frequency generated by the electromagnetic wave generation system, and determining a reference frequency according to the reflection parameters;
an optimal frequency determining step: controlling the electromagnetic wave generating system to adjust the frequency of the electromagnetic wave generated by the electromagnetic wave generating system in a carefully selected frequency range according to a preset second step length, obtaining a reflection parameter corresponding to each frequency generated by the electromagnetic wave generating system, and determining the optimal frequency as the initial frequency according to the reflection parameter; wherein,
the selected frequency range is a frequency within a range having the absolute value of the first step as a radius based on the reference frequency; and is also provided with
The absolute value of the second step is smaller than the absolute value of the first step.
10. A heating device, comprising:
the cavity is used for placing an object to be treated;
an electromagnetic wave generating system for generating electromagnetic waves in the cavity to heat the object to be treated; and
a controller configured to perform the control method of any one of claims 1-9.
CN202210799101.4A 2022-07-06 2022-07-06 Control method for heating device and heating device Pending CN117412416A (en)

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Application Number Priority Date Filing Date Title
CN202210799101.4A CN117412416A (en) 2022-07-06 2022-07-06 Control method for heating device and heating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210799101.4A CN117412416A (en) 2022-07-06 2022-07-06 Control method for heating device and heating device

Publications (1)

Publication Number Publication Date
CN117412416A true CN117412416A (en) 2024-01-16

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CN202210799101.4A Pending CN117412416A (en) 2022-07-06 2022-07-06 Control method for heating device and heating device

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