CN113099569B - Control method for heating device and heating device - Google Patents
Control method for heating device and heating device Download PDFInfo
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- CN113099569B CN113099569B CN202010018840.6A CN202010018840A CN113099569B CN 113099569 B CN113099569 B CN 113099569B CN 202010018840 A CN202010018840 A CN 202010018840A CN 113099569 B CN113099569 B CN 113099569B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/68—Circuits for monitoring or control
Abstract
The invention provides a control method for a heating device and the heating device. The heating device comprises an electromagnetic wave generating module for generating an electromagnetic wave signal for heating an object to be processed, and a matching module for adjusting the load impedance of the electromagnetic wave generating module by adjusting the impedance of the matching module, wherein the matching module comprises a first matching unit for adjusting the matched frequency point and a second matching unit for adjusting the amplitude of the frequency point. The control method comprises the following steps: controlling an electromagnetic wave generation module to generate an electromagnetic wave signal with preset initial power; adjusting the impedance of the first matching unit and the second matching unit, and determining the impedance value of the first matching unit for realizing the optimal load matching of the electromagnetic wave generation module; the characteristic parameters of the object to be processed are determined according to the impedance value of the first matching unit, a user does not need to manually input the characteristic parameters of the object to be processed according to experience or measurement, a sensing device for sensing the corresponding characteristic parameters in the cavity capacitor is reduced, the cost is saved, and the errors of the characteristic parameters are reduced.
Description
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
During the freezing process, the quality of the food is maintained, however, the frozen food needs to be thawed before processing or consumption. In order to facilitate the user to thaw the food, the food is generally thawed by the electromagnetic wave heating apparatus.
The electromagnetic wave heating device is used for unfreezing the food, so that the speed is high, the efficiency is high, and the loss of nutritional ingredients of the food is low. However, in the prior art, the user generally determines the thawing completion by setting the time, which not only imposes an excessive requirement on the user and easily causes the food after thawing to be too cold or too hot, but also causes the problems of non-uniform thawing and local overheating due to the difference in penetration and absorption of water and ice by microwaves, non-uniform distribution of substances in the food, and large amount of energy absorbed by the melted region.
Disclosure of Invention
It is an object of the first aspect of the present invention to overcome at least one technical drawback of the prior art and to provide a control method for an electromagnetic wave heating apparatus.
It is a further object of the first aspect of the invention to improve the accuracy of the characteristic parameter.
It is a further object of the first aspect of the invention to improve the efficiency of load matching.
It is an object of the second aspect of the present invention 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 an electromagnetic wave generating module that generates an electromagnetic wave signal for heating an object to be processed, and a matching module that adjusts a load impedance of the electromagnetic wave generating module by adjusting its own impedance, the matching module including a first matching unit that adjusts a frequency point of matching and a second matching unit that adjusts an amplitude of the frequency point, wherein the control method includes:
controlling the electromagnetic wave generation module to generate an electromagnetic wave signal with preset initial power;
adjusting the impedance of the first matching unit and the second matching unit, and determining the impedance value of the first matching unit for realizing the optimal load matching of the electromagnetic wave generation module;
and determining the characteristic parameters of the object to be processed according to the impedance value of the first matching unit.
Optionally, traversing the selectable combinations of the first matching unit and the second matching unit, and acquiring a matching degree parameter corresponding to each selectable combination and reflecting the load matching degree of the electromagnetic wave generation module;
comparing the matching degree parameters of all the optional combinations;
and determining the selectable combination for realizing the optimal load matching and the impedance value of the first matching unit corresponding to the selectable combination according to the comparison result.
Optionally, the step of traversing the selectable combination of the first matching unit and the second matching unit comprises:
acquiring a pre-configured impedance set, wherein the impedance set comprises impedance values of the first matching unit and impedance values of the second matching unit in all selectable combinations;
adjusting the impedance value of the first matching unit and the impedance value of the second matching unit one by one according to the impedance set; wherein
In the impedance set, the impedance values of the first matching units are sequentially ordered from large to small, and then the selectable combinations with the same impedance value of the first matching unit are sequentially ordered from large to small according to the impedance values of the second matching units.
Optionally, after the step of determining the characteristic parameter of the object to be processed according to the impedance value of the first matching unit, the method further includes:
and re-determining the optional combination for realizing the optimal load matching among the optional combinations for realizing the optimal load matching when the impedance value of the first matching unit is less than or equal to the impedance value of the first matching unit for realizing the optimal load matching.
Optionally, the characteristic parameter is weight and/or temperature and/or heating time and/or heating power for heating to a set temperature.
Optionally, the step of determining the characteristic parameter of the object to be processed according to the impedance value of the first matching unit includes:
and matching corresponding characteristic parameters according to the impedance value of the first matching unit and a preset comparison table, wherein the comparison table records the corresponding relation between the impedance value and the characteristic parameters.
Optionally, the control method further includes:
judging whether the impedance value of the first matching unit for realizing the optimal load matching is less than or equal to a preset lower limit threshold value or not;
if so, controlling the electromagnetic wave generation module to stop working;
if not, controlling the electromagnetic wave generation module to generate an electromagnetic wave signal with preset heating power.
According to a second aspect of the present invention, there is provided a heating apparatus, characterized by comprising:
the cavity capacitor is used for placing an object to be processed;
the electromagnetic wave generating module is configured to generate an electromagnetic wave signal and is used for heating the object to be processed in the cavity capacitor;
a matching module configured to adjust a load impedance of the electromagnetic wave generating module by adjusting its own impedance, including a first matching unit adjusting a frequency point of matching and a second matching unit adjusting an amplitude of the frequency point; and
a controller configured to perform any of the control methods described above.
Optionally, the first matching unit and the second matching unit are both variable capacitors; and is
The second matching unit is connected in series between the electromagnetic wave generation module and the cavity capacitor, one end of the first matching unit is connected in series between the second matching unit and the cavity capacitor, and the other end of the first matching unit is grounded.
Optionally, the first matching unit and the second matching unit are both variable inductors; and is
The first matching unit is connected in series between the electromagnetic wave generation module and the cavity capacitor, one end of the first matching unit is connected in series between the electromagnetic wave generation module and the second matching unit, and the other end of the first matching unit is grounded.
The characteristic parameters of the object to be processed are determined through the impedance value of the first matching unit for realizing the optimal load matching, so that the characteristic parameters of the object to be processed do not need to be manually input by a user according to experience or measurement, sensing devices for sensing the corresponding characteristic parameters in the cavity capacitor are reduced, the cost is saved, and the errors of the characteristic parameters are reduced.
Furthermore, the invention determines the characteristic parameter of the object to be processed by combining the impedance value of the first matching unit for realizing the optimal load matching with the comparison table, namely determining the characteristic parameter of the object to be processed through the capacitance value range of the cavity capacitor, and compared with the method of directly measuring the capacitance value of the cavity capacitor and then calculating the characteristic parameter of the object to be processed according to the capacitance value, the cost of the measuring device is saved.
Furthermore, the invention redetermines the optional combination for realizing the optimal load matching from the optional combinations of the impedance value of the first matching unit which is less than or equal to the impedance value of the first matching unit for realizing the optimal load matching, shortens the time for subsequently carrying out the load matching again, and effectively improves the heating effect.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the 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 circuit diagram of a matching module according to one embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a matching module according to another embodiment of the present invention;
FIG. 5 is a schematic flow chart diagram of a control method for a heating apparatus according to one embodiment of the present invention;
fig. 6 is a flowchart of the steps of adjusting the impedance of the matching module in fig. 5 and determining the impedance value of the matching module that achieves the optimal load matching of the electromagnetic wave generation module;
fig. 7 is a 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 configuration diagram 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 capacitor 110, an electromagnetic wave generation module 120, a matching module 130, and a controller 140.
Specifically, the cavity capacitor 110 may include a cavity for placing the object 150 to be processed and a radiation plate disposed in the cavity. In some embodiments, a receiving plate may be disposed within the cavity to form a capacitor with the radiating plate. In other embodiments, the cavity may be made of metal to form a capacitor with the receiving plate and the radiating plate.
The electromagnetic wave generating module 120 may be configured to generate an electromagnetic wave signal and electrically connected to the radiation plate of the cavity capacitor 110 to generate an electromagnetic wave in the cavity capacitor 110, so as to heat the object 150 to be processed in the cavity capacitor 110.
The matching module 130 may be connected in series between the electromagnetic wave generating module 120 and the cavity capacitor 110 or connected in parallel to both ends of the cavity capacitor 110, and is configured to adjust the load impedance of the electromagnetic wave generating module 120 by adjusting its own impedance, so as to implement load matching and improve heating efficiency.
The matching module 130 may include a first matching unit 131 and a second matching unit 132. Among them, the first matching unit 131 can be mainly used to adjust the frequency point of matching, i.e., to achieve optimal matching at a specific electromagnetic wave frequency. The second matching unit 132 may be used mainly for adjusting the amplitude of the frequency points, i.e. for adjusting the effect of load matching.
Fig. 2 is a schematic block diagram of the controller 140 of fig. 1. Referring to fig. 2, the controller 140 may include a processing unit 141 and a storage unit 142. Wherein the storage unit 142 stores a computer program 143, the computer program 143 being executed by the processing unit 141 for implementing the control method of an embodiment of the present invention.
In some embodiments, the processing unit 141 may be configured to, after acquiring the heating instruction, control the electromagnetic wave generation module 120 to generate an electromagnetic wave signal with a preset initial power, adjust the impedances of the first matching unit 131 and the second matching unit 132, determine an impedance value of the first matching unit 131 that achieves optimal load matching of the electromagnetic wave generation module 120, and further determine the characteristic parameter of the object to be processed 150 according to the impedance value of the first matching unit 131.
According to the invention, the characteristic parameters of the object 150 to be processed are determined through the impedance value of the first matching unit 131 for realizing the optimal load matching, so that the characteristic parameters of the object 150 to be processed do not need to be manually input by a user according to experience or measurement, sensing devices for sensing the corresponding characteristic parameters in the cavity capacitor 110 are reduced, the cost is saved, and the errors of the characteristic parameters are reduced.
As will be understood by those skilled in the art, the optimal load matching of the electromagnetic wave generation module 120 refers to the largest proportion of the output power distributed to the cavity capacitor 110 by the electromagnetic wave generation module 120 under the same heating device.
In the invention, the preset initial power may be 10-20W, for example, 10W, 15W or 20W, so as to obtain the impedance value of the matching module 130 with high accuracy for realizing the optimal load matching while saving energy.
The characteristic parameter may be one or a combination of more of weight, temperature, heating time to set temperature, and heating power, as required by the actual application.
In some further embodiments, the processing unit 141 may be configured to traverse the selectable combinations of the first matching unit 131 and the second matching unit 132, obtain a matching degree parameter corresponding to each selectable combination and reflecting the load matching degree of the electromagnetic wave generation module 120, compare the matching degree parameters of all the selectable combinations, and determine, according to the comparison result, the selectable combination achieving the optimal load matching and the impedance value of the first matching unit 131 corresponding to the selectable combination.
The storage unit 142 may store in advance an impedance set including all selectable combinations of the impedance values of the first matching unit 131 and the impedance values of the second matching unit 132. The processing unit 141 may be configured to adjust the impedance value of the first matching unit 131 and the impedance value of the second matching unit 132 one by one according to the impedance set to perform impedance matching.
In the impedance set, the impedance values of the first matching units 131 are sequentially ranked from large to small, and then the selectable combinations with the same impedance value of the first matching units 131 are sequentially ranked from large to small according to the impedance values of the second matching units 132, so as to improve the accuracy of the determined impedance value of the first matching unit 131 for realizing the optimal load matching. That is, the processing unit 141 may be configured to fix the impedance value of the first matching unit 131 at its maximum impedance value, traverse the impedance values of all the second matching units 132, fix the impedance value of the first matching unit 131 at an impedance value smaller than its previous impedance value, traverse the impedance values of all the second matching units 132, and so on, traverse all the selectable combinations of the first matching unit 131 and the second matching unit 132.
Fig. 3 is a schematic circuit diagram of the matching module 130 according to an embodiment of the present invention, IN which "IN" denotes one end electrically connected to the electromagnetic wave generating module 120, and "OUT" denotes one end electrically connected to the cavity capacitor 110. Referring to fig. 3, the first matching unit 131 and the second matching unit 132 may each be a variable capacitor. The second matching unit 132 may be connected in series between the electromagnetic wave generating module 120 and the cavity capacitor 110, and one end of the first matching unit 131 may be connected in series between the second matching unit 132 and the cavity capacitor 110, and the other end is grounded, so as to improve the stability of the matching module 130 and improve the accuracy of the impedance value of the first matching unit 131 for implementing optimal load matching.
Fig. 4 is a schematic circuit diagram of a matching module 130 according to another embodiment of the present invention. Referring to fig. 4, the first matching unit 131 and the second matching unit 132 may both be variable inductors. The first matching unit 131 may be connected in series between the electromagnetic wave generating module 120 and the cavity capacitor 110, and one end of the first matching unit 131 may be connected in series between the electromagnetic wave generating module 120 and the second matching unit 132 and the other end thereof is grounded.
In some embodiments, the heating apparatus 100 may further include a bidirectional coupler connected in series between the cavity capacitor 110 and the electromagnetic wave generation module 120, for monitoring the forward power signal output by the electromagnetic wave generation module 120 and the reverse power signal returned to the electromagnetic wave generation module 120 in real time.
The processing unit 141 may be configured to acquire a forward power signal output by the electromagnetic wave generation module 120 and a reverse power signal returned to the electromagnetic wave generation module 120 after adjusting the impedance value of the first matching unit 131 and/or the second matching unit 132 each time, and calculate a matching degree parameter according to the forward power signal and the reverse power signal.
The matching degree parameter may be a return loss S11, which may be calculated according to the formula S11 — 20log (reverse power/forward power), in this embodiment, the smaller the value of the return loss S11, the higher the load matching degree of the electromagnetic wave generating module 120 is reflected, and the impedance value of the matching module 130 corresponding to the minimum return loss S11 is the impedance value for achieving the optimal load matching.
The matching degree parameter may also be an electromagnetic wave absorption rate, which may be calculated according to a formula (1-reverse power/forward power), in this embodiment, the larger the value of the electromagnetic wave absorption rate is, the higher the load matching degree of the electromagnetic wave generation module 120 is reflected, and the impedance value of the matching module 130 corresponding to the maximum electromagnetic wave absorption rate is the impedance value for achieving the optimal load matching.
The matching degree parameter may also be other parameters that can represent the proportion of the output power distributed to the cavity capacitor 110 by the electromagnetic wave generation module 120.
In some embodiments, the storage unit 142 may store a pre-configured comparison table, in which the correspondence relationship between the impedance value and the characteristic parameter of the first matching unit 131 is recorded. The processing unit 141 may be configured to match the corresponding characteristic parameters according to a preset lookup table according to the impedance value of the first matching unit 131 that realizes the optimal load matching.
The heating device 100 of the present invention determines the characteristic parameter of the object 150 to be processed by combining the impedance value of the first matching unit 131 for realizing the optimal load matching with the comparison table, that is, the characteristic parameter of the object 150 to be processed is determined by the capacitance value range of the cavity capacitor 110, compared with directly measuring the capacitance value of the cavity capacitor 110 and then calculating the characteristic parameter of the object 150 to be processed according to the capacitance value, the cost of the measuring device is saved, and the inventors of the present application creatively find that the characteristic parameter is determined by the capacitance value range, which can contain the error of the measuring device, obtain the characteristic parameter with higher accuracy, and further obtain the excellent heating effect.
In some further embodiments, only one corresponding relationship is recorded in the comparison table, and the characteristic parameter can be directly obtained from the impedance value according to the comparison table, so as to simplify the obtaining process of the characteristic parameter.
In yet further embodiments, the correspondence at different initial temperatures is recorded in the look-up table. The processing unit 141 may be further configured to obtain an initial temperature of the object 150 to be processed, match the corresponding relationship according to the initial temperature, and further match the corresponding characteristic parameter according to the corresponding relationship in combination with the impedance value, so as to avoid the influence of the temperature on the capacitance value of the cavity capacitor 110, and further improve the accuracy of the characteristic parameter. In this embodiment, the characteristic parameter may be one or a combination of more of weight, heating time to a set temperature, and heating power.
In still further embodiments, the correspondence relationship between different weights of the object 150 to be treated is recorded in the comparison table. The processing unit 141 may be further configured to obtain the weight of the object 150 to be processed, match the corresponding relationship according to the weight, and further match the corresponding characteristic parameter according to the corresponding relationship in combination with the impedance value, so as to avoid the influence of the weight on the capacitance value of the cavity capacitor 110, and further improve the accuracy of the characteristic parameter. In this embodiment, the characteristic parameter may be one or a combination of parameters of the initial temperature, the heating time to the set temperature, and the heating power.
In the embodiment where the matching module 130 is connected in series between the electromagnetic wave generating module 120 and the cavity capacitor 110, the processing unit 141 may be configured to control the electromagnetic wave generating module 120 to stop working when the impedance value of the first matching unit 131 for implementing the optimal load matching is greater than or equal to the preset upper threshold, so as to avoid that the weight of the object to be processed 150 is too small, which causes the matching module 130 to generate heat to seriously reduce the heating efficiency, and the excessive heat generates heat to cause a potential safety hazard; when the impedance value of the first matching unit 131 for realizing the optimal load matching is less than or equal to the preset lower threshold, the electromagnetic wave generating module 120 is controlled to stop working, so as to avoid that the weight of the object to be processed 150 is too large and the heating effect is too poor.
In the present invention, the preset upper threshold may be greater than the maximum impedance value of the first matching unit 131, and the preset lower threshold may be less than the minimum impedance value of the first matching unit 131.
In some embodiments, the heating device 100 may further include an interaction module for sending a visual and/or audible signal to the user. The processing unit 141 may be further configured to control the interaction module to send a visual and/or audible signal prompting idling to a user when the impedance value of the first matching unit 131 achieving the optimal load matching is greater than or equal to a preset upper threshold; when the impedance value of the first matching unit 131 for realizing the optimal load matching is less than or equal to the preset lower threshold, the interaction module is controlled to send a visual and/or auditory signal prompting overload to the user, so as to improve the user experience.
When the impedance value of the first matching unit 131 for achieving the optimal load matching is greater than the preset lower limit value and less than the preset upper limit threshold value, the processing unit 141 may be configured to control the electromagnetic wave generating module 120 to generate an electromagnetic wave signal with a preset heating power within a preset heating time, and start to heat the object 150 to be processed. The preset heating time and the preset heating power are obtained by matching impedance values according to a preset comparison table.
In some embodiments, after the object 150 to be processed is heated, the processing unit 141 may be configured to re-determine the optional combination for achieving the optimal load matching among the optional combinations for achieving the impedance value of the first matching unit 131 that is less than or equal to the impedance value of the first matching unit 131 for achieving the optimal load matching, so as to shorten the time required for subsequent re-performing of load matching, and effectively improve the heating effect. That is, in each heating program, after the object 150 to be processed is heated, the impedance set is determined again and the selectable combinations that achieve the optimal load matching are determined again in the impedance set, where the new impedance set is all the selectable combinations in which the impedance value of the first matching unit 131 is equal to or less than the impedance value of the first matching unit 131 that achieved the optimal load matching in the previous time.
Fig. 5 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. 5, the control method for the heating apparatus 100 performed by the controller 140 of any of the above embodiments of the present invention may include the steps of:
step S502: the electromagnetic wave generation module 120 is controlled to generate an electromagnetic wave signal with a preset initial power. In this step, the preset initial power may be 10-20W, for example, 10W, 15W or 20W, so as to obtain the impedance value of the matching module 130 with high accuracy for realizing the optimal load matching while saving energy.
Step S504: the impedances of the first matching unit 131 and the second matching unit 132 are adjusted, and the impedance value of the first matching unit 131 that achieves the optimal load matching of the electromagnetic wave generation module 120 is determined.
Step S506: the characteristic parameter of the object to be processed 150 is determined according to the impedance value of the first matching unit 131.
The control method of the invention determines the characteristic parameters of the object 150 to be processed through the impedance value of the first matching unit 131 realizing the optimal load matching, so that the user does not need to manually input the characteristic parameters of the object 150 to be processed according to experience or measurement, and sensing devices for sensing the corresponding characteristic parameters in the cavity capacitor 110 are reduced, thereby saving the cost and reducing the errors of the characteristic parameters.
The characteristic parameter may be one or a combination of more of weight, temperature, heating time to set temperature, and heating power, as required by the actual application.
In some embodiments, the characteristic parameter may be obtained by matching according to a lookup table in which a correspondence relationship between the impedance value of the first matching unit 131 and the characteristic parameter is recorded.
The control method of the invention determines the characteristic parameter of the object 150 to be processed by combining the impedance value of the first matching unit 131 for realizing the optimal load matching with the comparison table, namely determining the characteristic parameter of the object 150 to be processed through the capacitance value range of the cavity capacitor 110, compared with the method of directly measuring the capacitance value of the cavity capacitor 110 and then calculating the characteristic parameter of the object 150 to be processed according to the capacitance value, the cost of the measuring device is saved, and the inventor of the application creatively discovers that the characteristic parameter is determined through the capacitance value range, the error of the measuring device can be contained, the characteristic parameter with higher accuracy can be obtained, and the excellent heating effect can be further obtained.
In some further embodiments, only one corresponding relationship is recorded in the comparison table, and the characteristic parameter can be directly obtained from the impedance value according to the comparison table, so as to simplify the obtaining process of the characteristic parameter.
In yet further embodiments, the correspondence at different initial temperatures is recorded in the look-up table. The processing unit 141 may be further configured to obtain an initial temperature of the object 150 to be processed, match the corresponding relationship according to the initial temperature, and further match the corresponding characteristic parameter according to the corresponding relationship in combination with the impedance value, so as to avoid the influence of the temperature on the capacitance value of the cavity capacitor 110, and further improve the accuracy of the characteristic parameter. In this embodiment, the characteristic parameter may be one or a combination of more of weight, heating time to a set temperature, and heating power.
In still further embodiments, the correspondence relationship between different weights of the object 150 to be treated is recorded in the comparison table. The processing unit 141 may be further configured to obtain the weight of the object 150 to be processed, match the corresponding relationship according to the weight, and further match the corresponding characteristic parameter according to the corresponding relationship in combination with the impedance value, so as to avoid the influence of the weight on the capacitance value of the cavity capacitor 110, and further improve the accuracy of the characteristic parameter. In this embodiment, the characteristic parameter may be one or a combination of parameters of the initial temperature, the heating time to the set temperature, and the heating power.
Fig. 6 is a flowchart of the steps of adjusting the impedance of the matching module 130 in fig. 5 and determining the impedance value of the matching module 130 that achieves the optimal load matching of the electromagnetic wave generation module 120. Referring to fig. 6, the step of adjusting the impedance of the matching module 130 and determining the impedance value of the matching module 130 that realizes the optimal load matching of the electromagnetic wave generation module 120 according to an embodiment of the present invention may specifically include the following steps:
step S602: the selectable combinations of the first matching unit 131 and the second matching unit 132 are traversed, and a matching degree parameter which reflects the load matching degree of the electromagnetic wave generation module 120 and corresponds to each selectable combination is obtained. In this step, the impedance value of the first matching unit 131 and the impedance value of the second matching unit 132 may be adjusted one by one according to a pre-configured impedance set.
Step S604: and comparing the matching degree parameters of all the optional combinations.
Step S606: and determining the selectable combination for realizing the optimal load matching and the impedance value of the first matching unit 131 corresponding to the selectable combination according to the comparison result.
In some embodiments, in the impedance set, the impedance values of the first matching units 131 are sequentially ranked from large to small, and then the selectable combinations with the same impedance value of the first matching units 131 are sequentially ranked from large to small according to the impedance values of the second matching units 132, so as to improve the accuracy of the determined impedance value of the first matching unit 131 for realizing the optimal load matching.
In some embodiments, the matching degree parameter may be calculated according to the forward power signal output by the electromagnetic wave generation module 120 and the reverse power signal returned to the electromagnetic wave generation module 120, which are monitored by the bidirectional coupler.
Fig. 7 is a detailed flowchart of a control method for the heating apparatus 100 according to an embodiment of the present invention, in which "Y" represents "yes" and "N" represents "no". Referring to fig. 7, a control method for a heating apparatus 100 according to an embodiment of the present invention may include the steps of:
step S702: and acquiring a heating instruction.
Step S704: the initial temperature of the object to be processed 150 is acquired.
Step S706: the electromagnetic wave generation module 120 is controlled to generate an electromagnetic wave signal with a preset initial power.
Step S708: the selectable combinations of the first matching unit 131 and the second matching unit 132 are traversed to obtain matching degree parameters corresponding to each selectable combination and reflecting the load matching degree of the electromagnetic wave generation module 120, the matching degree parameters of all the selectable combinations are compared, and the selectable combination realizing the optimal load matching and the impedance value of the first matching unit 131 corresponding to the selectable combination are determined according to the comparison result.
Step S710: and judging whether the impedance value for realizing the optimal load matching is greater than or equal to a preset upper limit threshold value or not. If yes, go to step S712; if not, go to step S714. In this step, the preset upper threshold may be greater than the maximum impedance value of the first matching unit 131.
Step S712: the electromagnetic wave generation module 120 is controlled to stop working, and a visual and/or auditory signal prompting no-load is sent to a user, so that the situation that the matching module 130 generates heat seriously to reduce the heating efficiency and cause potential safety hazards due to excessive heat caused by too small weight of the object 150 to be processed is avoided.
Step S714: and judging whether the impedance value for realizing the optimal load matching is less than or equal to a preset lower limit threshold value or not. If yes, go to step S716; if not, go to step S718. In this step, the preset lower threshold may be less than the minimum impedance value of the first matching unit 131.
Step S716: the electromagnetic wave generating module 120 is controlled to stop working, and a visual and/or audible signal for prompting overload is sent to the user, so that the phenomenon that the weight of the object to be processed 150 is too large and the heating effect is too poor is avoided.
Step S718: and matching the corresponding heating time and heating power according to the initial temperature matching corresponding relation and by combining the impedance value of the first matching unit 131 for realizing the optimal load matching.
Step S720: the electromagnetic wave signal for controlling the electromagnetic wave generation module 120 to generate the heating power.
Step S722: and judging whether the heating time is reached. If yes, go to step S724; if not, go to step S726.
Step S724: the electromagnetic wave generation module 120 is controlled to stop operating. Return to step S702.
Step S726: the selectable combination that achieves the optimal load matching is newly determined among the selectable combinations that have the impedance value of the first matching unit 131 equal to or less than the impedance value of the previous first matching unit 131 that achieves the optimal load matching. Step S720 is performed, that is, before the heating of the object to be processed 150 is completed, the electromagnetic wave generating module 120 always generates the electromagnetic wave signal of the heating power determined by the impedance value of the first matching unit 131 and the initial temperature of the object to be processed 150, and the matching module 130 performs the load matching again at intervals of the preset time to further improve the heating power and the heating effect.
The heating device 100 and the control method are particularly suitable for food thawing, and particularly for thawing food to-4-0 ℃, namely, the set temperature is-4-0 ℃, so that more accurate characteristic parameter values can be obtained.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (8)
1. A control method for a heating apparatus including an electromagnetic wave generating module that generates an electromagnetic wave signal for heating an object to be processed, and a matching module that adjusts a load impedance of the electromagnetic wave generating module by adjusting its own impedance, the matching module including a first matching unit that adjusts a frequency point of matching and a second matching unit that adjusts an amplitude of the frequency point, wherein the control method comprises:
controlling the electromagnetic wave generation module to generate an electromagnetic wave signal with preset initial power;
adjusting the impedance of the first matching unit and the second matching unit, and determining the impedance value of the first matching unit for realizing the optimal load matching of the electromagnetic wave generation module;
determining characteristic parameters of the object to be processed according to the impedance value of the first matching unit; wherein the adjusting of the impedances of the first and second matching units and the determining of the impedance value of the first matching unit that achieves the optimal load matching of the electromagnetic wave generation module includes:
traversing the selectable combinations of the first matching unit and the second matching unit, and acquiring a matching degree parameter which corresponds to each selectable combination and reflects the load matching degree of the electromagnetic wave generation module;
comparing the matching degree parameters of all the optional combinations;
determining an optional combination for realizing optimal load matching and an impedance value of a first matching unit corresponding to the optional combination according to a comparison result; wherein traversing the selectable combination of the first matching unit and the second matching unit comprises:
acquiring a pre-configured impedance set, wherein the impedance set comprises impedance values of the first matching unit and impedance values of the second matching unit of all selectable combinations;
adjusting the impedance value of the first matching unit and the impedance value of the second matching unit one by one according to the impedance set; wherein
In the impedance set, the impedance values of the first matching units are sequentially ordered from large to small, and then the selectable combinations with the same impedance value of the first matching unit are sequentially ordered from large to small according to the impedance values of the second matching units.
2. The control method according to claim 1, further comprising, after the step of determining the characteristic parameter of the object to be processed from the impedance value of the first matching unit:
and taking the combination of the impedance value of the first matching unit in the current optional combination, which is less than or equal to the impedance value of the first matching unit realizing the optimal load matching at this time, as the optional combination for determining to realize the optimal load matching at the next time.
3. The control method according to claim 1, wherein
The characteristic parameters are weight and/or temperature and/or heating time and/or heating power for heating to a set temperature.
4. The control method according to claim 1, wherein the step of determining the characteristic parameter of the object to be processed from the impedance value of the first matching unit includes:
and matching corresponding characteristic parameters according to the impedance value of the first matching unit and a preset comparison table, wherein the comparison table records the corresponding relation between the impedance value and the characteristic parameters.
5. The control method according to claim 1, further comprising:
judging whether the impedance value of the first matching unit for realizing the optimal load matching is less than or equal to a preset lower limit threshold value or not;
if yes, controlling the electromagnetic wave generation module to stop working;
if not, controlling the electromagnetic wave generation module to generate an electromagnetic wave signal with preset heating power.
6. A heating device, comprising:
the cavity capacitor is used for placing an object to be processed;
the electromagnetic wave generating module is configured to generate an electromagnetic wave signal and is used for heating the object to be processed in the cavity capacitor;
a matching module configured to adjust a load impedance of the electromagnetic wave generating module by adjusting its own impedance, including a first matching unit adjusting a frequency point of matching and a second matching unit adjusting an amplitude of the frequency point; and
a controller configured to perform the control method of any one of claims 1-5.
7. The heating device of claim 6, wherein
The first matching unit and the second matching unit are both variable capacitors; and is
The second matching unit is connected in series between the electromagnetic wave generation module and the cavity capacitor, one end of the first matching unit is connected in series between the second matching unit and the cavity capacitor, and the other end of the first matching unit is grounded.
8. The heating device of claim 6, wherein
The first matching unit and the second matching unit are both variable inductors; and is provided with
The first matching unit is connected in series between the electromagnetic wave generation module and the cavity capacitor, one end of the second matching unit is connected in series between the electromagnetic wave generation module and the first matching unit, and the other end of the second matching unit is grounded.
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| CN202010018840.6A CN113099569B (en) | 2020-01-08 | 2020-01-08 | Control method for heating device and heating device |
| PCT/CN2020/127859 WO2021139387A1 (en) | 2020-01-08 | 2020-11-10 | Method for controlling heating device, and heating device |
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| CN202010018840.6A CN113099569B (en) | 2020-01-08 | 2020-01-08 | Control method for heating device and heating device |
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| CN114641098B (en) * | 2022-03-17 | 2023-08-18 | 湖北中烟工业有限责任公司 | Impedance matching method and device for radio frequency heating smoking set and electronic equipment |
| CN117412422A (en) * | 2022-07-06 | 2024-01-16 | 青岛海尔电冰箱有限公司 | Control method for heating device and heating device |
| CN117412423A (en) * | 2022-07-06 | 2024-01-16 | 青岛海尔电冰箱有限公司 | Control method for heating device and heating device |
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| CN113099569A (en) | 2021-07-09 |
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