WO2024008119A1 - Procédé de commande pour dispositif de chauffage et dispositif de chauffage - Google Patents

Procédé de commande pour dispositif de chauffage et dispositif de chauffage Download PDF

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Publication number
WO2024008119A1
WO2024008119A1 PCT/CN2023/105905 CN2023105905W WO2024008119A1 WO 2024008119 A1 WO2024008119 A1 WO 2024008119A1 CN 2023105905 W CN2023105905 W CN 2023105905W WO 2024008119 A1 WO2024008119 A1 WO 2024008119A1
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WIPO (PCT)
Prior art keywords
frequency
electromagnetic wave
preset
heating
reflection
Prior art date
Application number
PCT/CN2023/105905
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English (en)
Chinese (zh)
Inventor
韩志强
刘阳
孙立洋
刘勇豪
张海洲
Original Assignee
青岛海尔电冰箱有限公司
海尔智家股份有限公司
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Application filed by 青岛海尔电冰箱有限公司, 海尔智家股份有限公司 filed Critical 青岛海尔电冰箱有限公司
Publication of WO2024008119A1 publication Critical patent/WO2024008119A1/fr

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Classifications

    • 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
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • 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
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • 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

Definitions

  • the present invention relates to the field of food processing, and in particular to a control method and heating device for an electromagnetic wave heating device.
  • the quality of food is maintained during the freezing process, but frozen food needs to be thawed before processing or eating.
  • electromagnetic wave heating devices are usually used to defrost food.
  • An object of the first aspect of the present invention is to overcome at least one technical defect in the prior art and provide a control method for a heating device.
  • a further object of the first aspect of the invention is to provide timely termination of heating.
  • Another further object of the first aspect of the invention is to improve the energy efficiency ratio of the heating device.
  • An object of the second aspect of the present invention is to provide an electromagnetic wave heating device.
  • a control method for a heating device includes a cavity for placing an object to be processed, and an electromagnetic wave generation system for generating electromagnetic waves in the cavity, To heat the object to be treated, wherein the control method includes:
  • the step of heating the object to be processed controlling the electromagnetic wave generating system to generate electromagnetic waves to heat the object to be processed;
  • Frequency matching step If the preset frequency modulation conditions are met, the step of heating the object to be processed is suspended, and the electromagnetic wave generating system is controlled to adjust the frequency of the electromagnetic waves it generates to meet the preset matching conditions, and the step of heating the object to be processed is Correct the frequency of the electromagnetic wave to a frequency that meets the preset matching conditions and continue the step of heating the object to be processed;
  • Terminating heating step if any one of the heating terminating conditions is met, control the electromagnetic wave generating system to stop working; wherein the heating terminating conditions include at least two of the following conditions:
  • the cumulative frequency difference of the preset number of frequency adjustments in the frequency matching step is less than the termination frequency difference threshold
  • the reflection parameter of the electromagnetic wave generation system is greater than the preset termination reflection threshold.
  • the step of heating the object to be treated it also includes:
  • Initial frequency determination step determine the frequency with the smallest reflection parameter from the candidate frequency range as the initial frequency of the object to be processed heating step.
  • control method also includes:
  • Remaining time determining step determine the remaining heating time according to the initial frequency;
  • the remaining heating time is inversely related to the initial frequency.
  • control method also includes:
  • Frequency difference threshold determining step determine the frequency difference threshold according to the initial frequency; wherein,
  • the frequency difference threshold is positively correlated with the initial frequency.
  • the initial frequency determination step further includes:
  • Reference frequency determination step control the electromagnetic wave generation system to adjust the frequency of the electromagnetic wave it generates within a preset alternative frequency range according to the preset first step, and determine the reference frequency according to the reflection parameters;
  • Optimal frequency determination step control the electromagnetic wave generation system to adjust the frequency of the electromagnetic wave it generates within a selected frequency range according to a preset second step, and determine the frequency with the smallest reflection parameter as the initial frequency; wherein ,
  • the selected frequency range is the frequency within the range based on the reference frequency and the absolute value of the first step length as the radius;
  • the absolute value of the second step size is less than the absolute value of the first step size
  • the electromagnetic wave generating system is controlled to adjust the frequency of the electromagnetic wave it generates according to the second step length.
  • the electromagnetic wave generating system is controlled to adjust the frequency of the electromagnetic wave it generates until the reflection parameter is less than a preset first reflection threshold, and the reflection parameter is less than the first preset reflection threshold.
  • the frequency of the reflection threshold is determined as the reference frequency;
  • the electromagnetic wave generating system is controlled to stop working.
  • control method also includes:
  • Power adjustment step If the cumulative frequency difference of any one or more frequency adjustments within the preset number of times in the frequency matching step is greater than the power reduction frequency difference threshold, control the electromagnetic wave generation system to reduce the power of the electromagnetic waves it generates.
  • the preset frequency modulation condition is that the electromagnetic wave generation system is not controlled to adjust its output for a continuous preset time.
  • the frequency of the generated electromagnetic wave or the reflection parameter of the electromagnetic wave generating system is greater than the preset frequency modulation reflection threshold;
  • Cavity used to place objects to be processed
  • An electromagnetic wave generating system used to generate electromagnetic waves in the cavity to heat the object to be treated
  • a controller configured to perform any of the above control methods.
  • the invention ensures timely termination of heating through multiple termination heating conditions, so that the heating of the object to be processed accurately stops at the state expected by the user, prevents the object to be processed from being overheated, and reduces the loss of nutrients in the object to be processed, especially during thawing. It can keep the thawed food in good shape during food processing, facilitate the user's subsequent processing, and improve the user experience.
  • the present invention determines whether a hot spot occurs in the object to be processed through the accumulated frequency difference of any one or more frequency adjustments within a preset number of times in the frequency matching step, and controls the electromagnetic wave when the accumulated frequency difference is greater than the power reduction frequency difference threshold.
  • the generating system reduces the power of the electromagnetic waves it generates, which can effectively prevent the hot spot from continuing to heat up rapidly and improve the temperature uniformity of the object to be processed, which is especially suitable for thawing food.
  • the inventor of this application creatively realized that during the thawing process of food, when a hot spot occurs locally in the food, the hot spot will change from ice to water, and since the dielectric constant of water is much greater than the dielectric constant of ice, the cavity will The resonant frequency of the object will change greatly in a short period of time. Through the cumulative frequency difference of any one or more frequency adjustments within the preset number of times, it can be accurately determined whether there are hot spots in the object to be processed, without the need for additional sensing components such as temperature sensors. , reducing production costs.
  • the present invention represents the rough position of the optimal frequency by first searching with a larger step size to determine the reference frequency, and then using a smaller step size to search near the reference frequency to determine the optimal frequency as the initial frequency.
  • the method of traversing all frequencies to determine the optimal frequency can increase the efficiency of determining the optimal frequency several times, thereby reducing the total heating time, reducing unnecessary energy loss, and improving the energy efficiency ratio of the heating device. .
  • Figure 1 is a schematic structural diagram of a heating device according to an embodiment of the present invention.
  • Figure 2 is a schematic structural diagram of the controller in Figure 1;
  • Figure 3 is a schematic flow chart of a control method for a heating device according to one embodiment of the present invention.
  • Figure 4 is a schematic detailed flow chart of a control method for a heating device according to one embodiment of the present invention.
  • the cavity 110 may include a barrel and a door.
  • the cylinder can be used to place objects 150 to be processed.
  • the door can be used to open and close the access port of the cylinder.
  • the cylinder and door can be equipped with electromagnetic shielding features to reduce electromagnetic leakage.
  • the barrel can be made of metal and set to be grounded.
  • the electromagnetic wave generating system can be at least partially disposed in the cavity 110 or communicate with the cavity 110 to generate electromagnetic waves in the cavity 110 to heat the object 150 to be processed.
  • the electromagnetic wave generation system may include an electromagnetic wave generation module 120, a radiation antenna 130 electrically connected to the electromagnetic wave generation module 120, and a power supply for supplying power to the electromagnetic wave generation module 120.
  • the electromagnetic wave generating module 120 may be configured to generate electromagnetic wave signals.
  • the radiation antenna 130 may be disposed in the cavity 110 to generate electromagnetic waves in the cavity 110 .
  • the electromagnetic wave generating module 120 may include a variable frequency source and a power amplifier.
  • FIG. 2 is a schematic structural diagram of the controller 140 in FIG. 1 .
  • the controller 140 may include a processing unit 141 and a storage unit 142.
  • the storage unit 142 stores a computer program 143, and when executed by the processing unit 141, the computer program 143 is used to implement the control method of the embodiment of the present invention.
  • the processing unit 141 can be configured to control the electromagnetic wave generation module 120 to generate an electromagnetic wave signal to heat the object to be processed, and when the preset frequency modulation conditions are met, control the electromagnetic wave generation module 120 to adjust the frequency of the electromagnetic wave signal it generates to meet the preset matching conditions. , and controls the electromagnetic wave generation module 120 to generate an electromagnetic wave signal with a frequency that satisfies the preset matching conditions until the preset frequency modulation conditions are reached next time, so as to improve the heating efficiency.
  • the preset frequency modulation condition may be that the electromagnetic wave generation module 120 is not controlled for a continuous preset time to adjust the frequency of the electromagnetic wave signal it generates, or the reflection parameter of the electromagnetic wave generation system is greater than the preset frequency modulation reflection threshold, so that the object to be processed 150 is heated during the heating process. It has always had a strong ability to absorb electromagnetic waves.
  • the reflection parameter may be return loss S11.
  • the reflection parameter may also be the reflected power value of the electromagnetic wave signal reflected back to the electromagnetic wave generating module 120 .
  • the preset matching condition may be that the reflection parameter of the electromagnetic wave generating system has a concave inflection point or the reflection parameter is a minimum value.
  • the processing unit 141 may be configured to control the electromagnetic wave generation module 120 to adjust the frequency of the electromagnetic wave signal in the low-frequency direction using the current frequency as a starting point to shorten the frequency matching time and avoid failure. Unexpected waste.
  • the processing unit 141 can be configured to control the electromagnetic wave generation module 120 to stop working when any one of the heating termination conditions is met to ensure that the heating is terminated in a timely manner, so that the heating of the object to be processed 150 stops accurately at the user's desired status.
  • the heating termination condition may include at least two of the following conditions: the remaining heating time countdown is completed; the cumulative frequency difference ⁇ f of the preset number of frequencies that meet the preset matching condition is less than the termination frequency difference threshold D2; the electromagnetic wave generation module 120 When the frequency of the electromagnetic wave is the minimum value of the preset alternative frequency range, the preset continued heating time is operated; when the frequency of the electromagnetic wave is the minimum value of the preset alternative frequency range, the electromagnetic wave generation module 120 The reflection parameter of the electromagnetic wave generation module 120 is greater than the preset termination reflection threshold S3 to determine whether the heating is completed from multiple angles such as time, physical state changes, and moisture content.
  • the termination heating condition may only include "the remaining heating time countdown is completed” and "the accumulated frequency difference ⁇ f of the preset number of frequencies that meet the preset matching condition is less than the termination frequency difference threshold D2".
  • the heating termination condition may only include "the remaining heating time countdown is completed" and "the electromagnetic wave generation module 120 operates for the preset continuing heating time when the frequency of the electromagnetic wave is the minimum value of the preset alternative frequency range.” .
  • the termination heating condition may only include "the accumulated frequency difference ⁇ of the frequency that satisfies the preset matching condition for a preset number of times.” f is less than the termination frequency difference threshold D2" and "when the frequency of the electromagnetic wave generation module 120 is the minimum value of the preset alternative frequency range, the reflection parameter of the electromagnetic wave generation module 120 is greater than the preset termination reflection threshold S3.”
  • the heating termination condition may only include "the electromagnetic wave generation module 120 operates for the preset continuing heating time when the frequency of the electromagnetic wave is the minimum value of the preset alternative frequency range” and “the electromagnetic wave generation module 120 operates for the preset continued heating time when the electromagnetic wave frequency is the minimum value of the preset alternative frequency range"
  • the reflection parameter of the electromagnetic wave generation module 120 is greater than the preset termination reflection threshold S3′′.
  • the heating termination conditions may only include "the remaining heating time countdown is completed", “the cumulative frequency difference ⁇ f of the preset number of frequencies that meet the preset matching conditions is less than the termination frequency difference threshold D2" and "the electromagnetic wave generation module 120 is in the electromagnetic wave When the frequency is the minimum value of the preset alternative frequency range, the work continues for the preset heating time.”
  • Alternative frequency range can be 350MHz-500MHz. Furthermore, the alternative frequency range may be 400MHz-460MHz to further improve the temperature uniformity of the object 150 to be processed.
  • the processing unit 141 may be configured to determine the frequency with the smallest reflection parameter (optimal frequency) from the candidate frequency range as the initial frequency for heating the object to be processed 150 .
  • the remaining heating time can be determined based on the initial frequency to reduce the number of sensing elements, reduce or even eliminate time deviations caused by errors in the sensing elements themselves, ensuring the accuracy of the remaining heating time and reducing Cost of production.
  • the remaining heating time can be negatively correlated with the initial frequency.
  • the processing unit 141 may be configured to control the electromagnetic wave generation module when the cumulative frequency difference ⁇ f of the frequencies that meet the preset matching condition for any one or more times within the preset number of times is greater than the power reduction frequency difference threshold D1 120 reduces the power of the electromagnetic wave signal it generates to effectively prevent the hot spot from continuing to heat up rapidly and improve the temperature uniformity of the object 150 to be processed.
  • the termination frequency difference threshold D2 may be smaller than the power reduction frequency difference threshold D1.
  • the processing unit 141 may be configured to calculate a single frequency difference between the frequency that satisfies the preset frequency modulation condition and the frequency that satisfies the preset matching condition each time, and stores the most recent preset number of single frequency differences in the storage unit 142 for timely processing. Determine the cumulative frequency difference ⁇ f for any one or more frequency adjustments.
  • the single frequency difference is the absolute value of the difference between the frequency that meets the preset frequency modulation conditions and the frequency that meets the preset matching conditions.
  • the cumulative frequency difference ⁇ f is the sum of the corresponding number of single frequency differences.
  • the processing unit 141 may be further configured to extend the remaining heating time while controlling the electromagnetic wave generating module 120 to reduce the power of the electromagnetic wave signal it generates to avoid incomplete heating.
  • the reduction ratio of the power of the electromagnetic wave signal may be smaller than the extension ratio of the remaining heating time, so that the heating of the object to be processed 150 is stopped in a state desired by the user while improving the temperature uniformity.
  • the power of the electromagnetic wave signal may be reduced by 20%-40%, such as 20%, 30%, or 40%.
  • the remaining heating time can be extended by 35%-55%, such as 35%, 40%, 45%, or 55%.
  • the power reduction frequency difference threshold D1 and the termination frequency difference threshold D2 can be determined according to the initial frequency to adapt to different types and size parameters of the objects 150 to be processed. Among them, the power reduction frequency difference threshold D1 and the termination frequency difference threshold D2 may be positively correlated with the initial frequency.
  • the processing unit 141 may be configured to first determine the reference frequency fb used to search for the optimal frequency, and then determine the optimal frequency fg suitable for heating as the initial frequency, so as to improve the efficiency of determining the optimal frequency fg. , thereby reducing the total heating time, reducing unnecessary energy loss, and improving the energy efficiency ratio of the heating device 100 .
  • the processing unit 141 may be configured to control the electromagnetic wave generation module 120 to adjust the frequency of the electromagnetic wave signal it generates within a preset alternative frequency range according to the preset first step length W1, and obtain each signal generated by the electromagnetic wave generation module 120.
  • the reflection parameter corresponding to the frequency is determined based on the reflection parameter and the reference frequency fb is determined.
  • the processing unit 141 may be further configured to control the electromagnetic wave generating module 120 to select The frequency of the electromagnetic wave signal generated is adjusted within the frequency range, the reflection parameters corresponding to each frequency generated by the electromagnetic wave generation module 120 are obtained, and the optimal frequency fg is determined based on the reflection parameters.
  • the selected frequency range may be a frequency within a range based on the reference frequency fb and with the absolute value of the first step length W1 as the radius.
  • the absolute value of the second step length W2 may be smaller than the absolute value of the first step length W1.
  • the processing unit 141 may be configured to incrementally search the reference frequency fb from the minimum value of the alternative frequency range. That is, the first step length W1 is a positive number.
  • the processing unit 141 may also be configured to search the reference frequency fb decrementally from the maximum value of the alternative frequency range. That is, the first step length W1 is negative.
  • the absolute value of the first step length W1 can be 5MHz-10MHz. For example, 5MHz, 7MHz, or 10MHz.
  • the absolute value of the second step size W2 can be 1MHz-2MHz. For example, 1MHz, 1.5MHz, or 2MHz.
  • the processing unit 141 may be configured to control the electromagnetic wave generation module 120 to adjust the frequency of the electromagnetic wave signal it generates until the reflection parameter is less than the preset first reflection threshold S1, and to set the reflection parameter to be less than the first reflection threshold.
  • the frequency of S1 is determined as the base frequency fb. That is, the processing unit 141 determines the frequency at which the reflection parameter is smaller than the first reflection threshold S1 for the first time as the reference frequency fb, so as to further improve the efficiency of determining the optimal frequency fg while obtaining the accurate optimal frequency fg.
  • the processing unit 141 may be configured to first determine a search direction from the reference frequency fb to high frequency or to low frequency, and then further control the electromagnetic wave generation module 120 to adjust the electromagnetic wave signal generated by it in the search direction. There is a concave inflection point from frequency to reflection parameter.
  • the processing unit 141 may be configured to obtain reflection parameters of frequencies greater than the second step size W2 than the reference frequency fb and frequencies smaller than the second step size W2 than the reference frequency fb, respectively, and compare the two The size of the reflection parameter, and the direction corresponding to the frequency with the smaller reflection parameter is determined as the search direction.
  • the processing unit 141 may be configured to control the electromagnetic wave generation module 120 to stop working and send out a visual signal and/or when the reflection parameter corresponding to the optimal frequency fg is greater than the preset second reflection threshold S2 Auditory signals indicate malfunctions to avoid poor heating results.
  • the second reflection threshold S2 may be smaller than the first reflection threshold S1.
  • the processing unit 141 may be configured to determine the remaining heating according to the optimal frequency fg when the optimal frequency fg is greater than or equal to the preset minimum frequency threshold fi and less than or equal to the preset maximum frequency threshold fa. time.
  • 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 send out a visual signal and/or an auditory signal to prompt that the heating is completed.
  • the processing unit 141 may be configured to, when the optimal frequency fg is less than the minimum frequency threshold fi, control the electromagnetic wave generation module 120 to stop working and send out a visual signal and/or an auditory signal to prompt overloading to avoid heating. Too long.
  • the difference between the minimum frequency threshold fi and the minimum value of the alternative frequency range can be the maximum value and the minimum value of the alternative frequency range. 15%-30% of the difference. For example, 15%, 20%, 25%, or 30%.
  • the processing unit 141 may be configured to, when the optimal frequency fg is greater than the maximum frequency threshold fa, control the electromagnetic wave generation module 120 to stop working and send out a visual signal and/or an auditory signal to indicate no load, so as to avoid Damage to the electromagnetic wave generating system.
  • the difference between the maximum value of the alternative frequency range and the maximum frequency threshold fa may be 5%-10% of the difference between the maximum value and the minimum value of the alternative frequency range. For example, 5%, 7%, 8%, or 10%.
  • the heating device 100 of the present invention is particularly suitable for use in refrigerators, and the cavity 110 can be disposed in a storage compartment of the refrigerator.
  • FIG. 3 is a schematic flowchart of a control method for the heating device 100 according to one embodiment of the present invention.
  • the control method for the heating device 100 of the present invention may include the following steps:
  • the object to be processed heating step (step S302): control the electromagnetic wave generation system to generate electromagnetic waves to heat the object to be processed;
  • Frequency matching step If the preset frequency modulation conditions are met, the step of heating the object to be processed is suspended, the electromagnetic wave generation system is controlled to adjust the frequency of the electromagnetic waves it generates to meet the preset matching conditions, and the electromagnetic wave in the step of heating the object to be processed is The frequency is corrected to the frequency that meets the preset matching conditions and the heating step of the object to be processed is continued to improve the heating efficiency;
  • Terminating heating step (step S306): If any one of the heating terminating conditions is met, the electromagnetic wave generating system is controlled to stop working to ensure that heating is terminated in a timely manner so that the heating of the object 150 to be processed accurately stops in the state desired by the user.
  • the heating termination condition may include at least two of the following conditions: the remaining heating time countdown is completed; the cumulative frequency difference ⁇ f of the preset number of frequencies that meet the preset matching condition is less than the termination frequency difference threshold D2; the electromagnetic wave generation module 120 When the frequency of the electromagnetic wave is the minimum value of the preset alternative frequency range, the preset continued heating time is operated; when the frequency of the electromagnetic wave is the minimum value of the preset alternative frequency range, the electromagnetic wave generation module 120 The reflection parameter of the electromagnetic wave generation module 120 is greater than the preset termination reflection threshold S3 to determine whether the heating is completed from multiple angles such as time, physical state changes, and moisture content.
  • the termination heating condition may only include "the remaining heating time countdown is completed” and "the accumulated frequency difference ⁇ f of the preset number of frequencies that meet the preset matching condition is less than the termination frequency difference threshold D2".
  • the heating termination condition may only include "the remaining heating time countdown is completed" and "the electromagnetic wave generation module 120 operates for the preset continuing heating time when the frequency of the electromagnetic wave is the minimum value of the preset alternative frequency range.” .
  • the heating termination condition may only include "the cumulative frequency difference ⁇ f of the preset number of frequencies that meet the preset matching condition is less than the termination frequency difference threshold D2" and "the electromagnetic wave generation module 120 is a preset alternative when the frequency of the electromagnetic wave is In the case of the minimum value of the frequency range, the reflection parameter of the electromagnetic wave generating module 120 is greater than the preset termination reflection threshold S3′′.
  • the heating termination condition may only include "the electromagnetic wave generation module 120 operates for the preset continuing heating time when the frequency of the electromagnetic wave is the minimum value of the preset alternative frequency range” and “the electromagnetic wave generation module 120 operates for the preset continued heating time when the electromagnetic wave frequency is the minimum value of the preset alternative frequency range"
  • the reflection parameter of the electromagnetic wave generation module 120 is greater than the preset termination reflection threshold S3′′.
  • the heating termination conditions may only include "the remaining heating time countdown is completed", “the cumulative frequency difference ⁇ f of the preset number of frequencies that meet the preset matching conditions is less than the termination frequency difference threshold D2" and "the electromagnetic wave generation module 120 is in the electromagnetic wave When the frequency is the minimum value of the preset alternative frequency range, the work continues for the preset heating time.”
  • Alternative frequency range can be 350MHz-500MHz. Furthermore, the alternative frequency range may be 400MHz-460MHz to further improve the temperature uniformity of the object 150 to be processed.
  • the preset frequency modulation condition may be that the electromagnetic wave generation module 120 is not controlled to adjust the frequency of the electromagnetic wave signal it generates for a preset time continuously, or the reflection parameter of the electromagnetic wave generation system is greater than the preset frequency modulation.
  • the reflection threshold is such that the object to be processed 150 always has a strong ability to absorb electromagnetic waves during the heating process.
  • the reflection parameter may be return loss S11.
  • the reflection parameter may also be the reflected power value of the electromagnetic wave signal reflected back to the electromagnetic wave generating module 120 .
  • the preset matching condition may be that the reflection parameter of the electromagnetic wave generating system has a concave inflection point or the reflection parameter is a minimum value.
  • the electromagnetic wave generation module 120 in the frequency matching step, can be controlled to adjust the frequency of the electromagnetic wave signal in a low-frequency direction using the current frequency as a starting point to shorten the frequency matching time and avoid undesirable waste of energy consumption.
  • control method of the present invention may further include an initial frequency determination step before the step of heating the object to be treated.
  • the initial frequency determination step may determine the frequency with the smallest reflection parameter (optimal frequency) from the candidate frequency range as the initial frequency for heating the object 150 to be processed.
  • control method of the present invention may further include a remaining time determining step.
  • the remaining time determination step can determine the remaining heating time of the object to be processed 150 according to the initial frequency, so as to reduce the number of sensing elements, reduce or even eliminate the time deviation caused by the error of the sensing element itself, ensure the accuracy of the remaining heating time, and reduce production costs.
  • the remaining heating time can be negatively correlated with the initial frequency.
  • control method of the present invention may further include a power adjustment step.
  • the power adjustment step can control the electromagnetic wave generation module 120 to reduce the electromagnetic wave signal generated by the electromagnetic wave generation module 120 when the cumulative frequency difference ⁇ f of the frequency that satisfies the preset matching condition for any one or more times within the preset number of times is greater than the power reduction frequency difference threshold D1. power to effectively prevent hot spots from continuing to heat up rapidly and improve the temperature uniformity of the object 150 to be processed.
  • the termination frequency difference threshold D2 may be smaller than the power reduction frequency difference threshold D1.
  • the frequency matching step may also include: calculating the single frequency difference before and after frequency adjustment, and storing the most recent preset number of single frequency differences, so as to determine the cumulative frequency difference ⁇ f of any one or more frequency adjustments in a timely manner.
  • the control method of the present invention may also include a time correction step.
  • the time correction step and the power adjustment step are performed simultaneously, and the remaining heating time is extended based on the current remaining heating time to avoid incomplete heating.
  • 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%-55%, such as 35%, 40%, 45%, or 55%.
  • control method of the present invention may further include a frequency difference threshold determining step.
  • the frequency difference threshold determination step can determine the power reduction frequency difference threshold D1 and the termination frequency difference threshold D2 according to the initial frequency to adapt to different types and size parameters of the objects 150 to be processed. Among them, the power reduction frequency difference threshold D1 and the termination frequency difference threshold D2 may be positively correlated with the initial frequency.
  • the initial frequency determination step may first determine the reference frequency fb used to search for the optimal frequency, and then determine the optimal frequency fg suitable for heating as the initial frequency to improve the efficiency of determining the optimal frequency fg, Thus, the total heating time is reduced, unnecessary energy loss is reduced, and the energy efficiency ratio of the heating device 100 is improved.
  • the optimal frequency determination step may include:
  • Reference frequency determination step control the electromagnetic wave generation module 120 to adjust the frequency of the electromagnetic wave signal it generates within the preset alternative frequency range according to the preset first step length W1, and obtain the reflection corresponding to each frequency generated by the electromagnetic wave generation module 120 parameters and determine the base frequency fb based on the reflection parameters;
  • Optimal frequency determination step control the electromagnetic wave generation module 120 to adjust the frequency of the electromagnetic wave signal it generates within the selected frequency range according to the preset second step size W2, and obtain the reflection parameters corresponding to each frequency generated by the electromagnetic wave generation module 120. number and determine the optimal frequency fg based on the reflection parameters.
  • the selected frequency range may be a frequency within a range based on the reference frequency fb and with the absolute value of the first step length W1 as the radius.
  • the absolute value of the second step length W2 may be smaller than the absolute value of the first step length W1.
  • the reference frequency fb may be searched incrementally from the minimum value of the alternative frequency range during the determination of the reference frequency fb. That is, the first step length W1 is a positive number.
  • the reference frequency fb may be searched in descending order from the maximum value of the alternative frequency range during the determination of the reference frequency fb. That is, the first step length W1 is negative.
  • the absolute value of the first step length W1 can be 5MHz-10MHz. For example, 5MHz, 7MHz, or 10MHz.
  • the absolute value of the second step size W2 can be 1MHz-2MHz. For example, 1MHz, 1.5MHz, or 2MHz.
  • the electromagnetic wave generation module 120 is controlled to adjust the frequency of the electromagnetic wave signal it generates until the reflection parameter is smaller than the preset first reflection threshold S1, and the reflection parameter is smaller than the first reflection threshold S1.
  • the frequency of the reflection threshold S1 is determined as the reference frequency fb. That is, the frequency where the reflection parameter for the first time is less than the first reflection threshold S1 is determined as the reference frequency fb, so as to obtain an accurate optimal frequency fg and further improve the efficiency of determining the optimal frequency fg.
  • the electromagnetic wave generation module 120 if the reflection parameters corresponding to each frequency generated by the electromagnetic wave generation module 120 are greater than the first reflection threshold S1, the electromagnetic wave generation module 120 is controlled to stop working and send out visual signals and/or auditory signals to prompt the user. Failure to avoid poor heating effect and damage to the electromagnetic wave generating system.
  • the electromagnetic wave generation module 120 is controlled to adjust the frequency of the electromagnetic wave signal it generates to an inflection point where the reflection parameter becomes concave, and determines the frequency corresponding to the inflection point as the optimal frequency. fg for excellent heating effect.
  • the reflection parameters corresponding to the previous frequency of the optimal frequency fg and the reflection parameters corresponding to the subsequent frequency are both greater than the reflection parameters of the optimal frequency fg (that is, they have a concave inflection point).
  • the search direction from the reference frequency fb to high frequency or to low frequency can be determined first, and then the electromagnetic wave generation module 120 is further controlled to adjust the generated energy in the search direction.
  • the frequency of the electromagnetic wave signal reaches a concave inflection point in the reflection parameter.
  • the reflection parameters of the frequency greater than the second step size W2 than the reference frequency fb and the frequency less than the second step size W2 than the reference frequency fb can be obtained respectively, the sizes of the two reflection parameters are compared, and the reflection parameters are updated.
  • the direction corresponding to the small frequency is determined as the search direction.
  • the electromagnetic wave generation module 120 is controlled to stop working and send a visual signal and/or an auditory signal to prompt a fault to avoid the heating effect. not good.
  • the second reflection threshold S2 may be smaller than the first reflection threshold S1.
  • the remaining heating time is determined according to the optimal frequency fg, and when the remaining heating time is 0
  • the electromagnetic wave generating module 120 is controlled to stop working and send out a visual signal and/or an auditory signal to indicate that heating is completed.
  • the difference between the minimum frequency threshold fi and the minimum value of the alternative frequency range may be 15%-30% of the difference between the maximum value and the minimum value of the alternative frequency range. For example, 15%, 20%, 25%, or 30%.
  • the electromagnetic wave generation module 120 is controlled to stop working and send a visual signal and/or an auditory signal to indicate no load, so as to avoid damaging the electromagnetic wave generation system.
  • the difference between the maximum value of the alternative frequency range and the maximum frequency threshold fa may be 5%-10% of the difference between the maximum value and the minimum value of the alternative frequency range. For example, 5%, 7%, 8%, or 10%.
  • FIG 4 is a schematic detailed flow chart of a control method for the heating device 100 according to one embodiment of the present invention (in Figure 4, "Y” represents “yes”; “N” represents “no”).
  • the control method for the heating device 100 of the present invention may include the following detailed steps:
  • Step S402 Control the electromagnetic wave generation system to adjust the frequency of the electromagnetic waves it generates within the preset alternative frequency range according to the preset first step length W1, and obtain the reflection parameters corresponding to each frequency generated by the electromagnetic wave generation system;
  • Step S404 Determine whether any reflection parameter is smaller than the first reflection threshold S1. If yes, execute step S406; if not, execute step S414.
  • Step S406 Determine the reference frequency fb from the frequency corresponding to the first occurrence of the reflection parameter smaller than the first reflection threshold S1.
  • Step S408 Control the electromagnetic wave generation system to adjust the frequency of the electromagnetic waves it generates according to the second step size W2 within the selected frequency range, obtain the reflection parameters corresponding to each frequency until the inflection point where the reflection coefficient becomes concave, and set the frequency corresponding to the inflection point Determine the optimal frequency fg.
  • Step S410 Determine the remaining heating time, the power reduction frequency difference threshold D1 and the termination frequency difference threshold D2 according to the optimal frequency fg. Execute step S412 and step S416.
  • Step S412 Determine whether the remaining heating time is equal to 0. If yes, perform step S414; if not, repeat step S412.
  • Step S414 Control the electromagnetic wave generating system to stop working.
  • Step S416 Determine whether the preset frequency modulation conditions are met. If yes, perform step S418; if not, repeat step S416.
  • Step S418 Control the electromagnetic wave generating system to adjust the frequency from the current frequency to a low frequency until it meets the preset matching conditions, and control the electromagnetic wave generating system to generate electromagnetic waves with a frequency that satisfies the preset matching conditions.
  • Step S420 Determine whether the current frequency is the minimum value of the candidate frequency range. If yes, execute step S422; if not, execute step S424.
  • Step S422 Determine whether the reflection parameter is greater than the preset termination reflection threshold S3. If yes, perform step S414; if not, repeat step S422.
  • Step S424 Calculate the single frequency difference before and after frequency adjustment, and store the most recent preset number of single frequency differences.
  • Step S426 Calculate the accumulated frequency difference ⁇ f of any one or more frequency adjustments within the preset number of times based on the stored single frequency difference, and determine whether the accumulated frequency difference ⁇ f of any one or more frequency adjustments within the preset number of times is greater than the power reduction. Frequency difference threshold D1. If yes, execute step S428; if not, execute step S430.
  • Step S428 Control the electromagnetic wave generating system to reduce the power of the electromagnetic waves it generates and extend the remaining heating time. Return to step S416.
  • Step S430 Determine whether the accumulated frequency difference ⁇ f of the preset number of frequency adjustments is less than the termination frequency difference threshold D2. If yes, execute step S414; if not, execute step S416.

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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 Heat Treatment Processes (AREA)
  • Tunnel Furnaces (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

La présente invention concerne un procédé de commande pour un dispositif de chauffage, et un dispositif de chauffage. Le procédé de commande consiste à : commander un système de production d'ondes électromagnétiques pour produire des ondes électromagnétiques, de façon à chauffer un objet à traiter ; si une condition de réglage de fréquence prédéfinie est satisfaite, mettre en pause l'étape de chauffage dudit objet, et commander au système de production d'ondes électromagnétiques d'ajuster la fréquence ; et si une condition de terminaison de chauffage quelconque est satisfaite, commander au système de production d'ondes électromagnétiques d'arrêter le fonctionnement.
PCT/CN2023/105905 2022-07-06 2023-07-05 Procédé de commande pour dispositif de chauffage et dispositif de chauffage WO2024008119A1 (fr)

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CN202210800514.X 2022-07-06

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004247128A (ja) * 2003-02-13 2004-09-02 Matsushita Electric Ind Co Ltd 高周波加熱装置
CN112969248A (zh) * 2019-12-13 2021-06-15 青岛海尔电冰箱有限公司 用于加热装置的控制方法及加热装置
CN112996161A (zh) * 2019-12-13 2021-06-18 青岛海尔电冰箱有限公司 用于加热装置的控制方法及加热装置
CN113099569A (zh) * 2020-01-08 2021-07-09 青岛海尔电冰箱有限公司 用于加热装置的控制方法及加热装置
CN114521033A (zh) * 2020-11-20 2022-05-20 青岛海尔特种电冰箱有限公司 用于加热装置的控制方法及加热装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004247128A (ja) * 2003-02-13 2004-09-02 Matsushita Electric Ind Co Ltd 高周波加熱装置
CN112969248A (zh) * 2019-12-13 2021-06-15 青岛海尔电冰箱有限公司 用于加热装置的控制方法及加热装置
CN112996161A (zh) * 2019-12-13 2021-06-18 青岛海尔电冰箱有限公司 用于加热装置的控制方法及加热装置
CN113099569A (zh) * 2020-01-08 2021-07-09 青岛海尔电冰箱有限公司 用于加热装置的控制方法及加热装置
CN114521033A (zh) * 2020-11-20 2022-05-20 青岛海尔特种电冰箱有限公司 用于加热装置的控制方法及加热装置

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