CN112969248B - Control method for heating device and heating device - Google Patents
Control method for heating device and heating device Download PDFInfo
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- CN112969248B CN112969248B CN201911283815.4A CN201911283815A CN112969248B CN 112969248 B CN112969248 B CN 112969248B CN 201911283815 A CN201911283815 A CN 201911283815A CN 112969248 B CN112969248 B CN 112969248B
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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
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/06—Heater elements structurally combined with coupling elements or holders
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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
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
Abstract
The invention provides a control method for a heating device and the heating device. The heating device comprises a cavity capacitor for placing the object to be treated and an electromagnetic wave generation module for generating an electromagnetic wave signal for heating the object to be treated. The control method comprises the following steps: determining characteristic parameters of the object to be processed according to the capacitance value of the cavity capacitor; and controlling the electromagnetic wave generation module to work according to the characteristic parameters. The heating device and the control method thereof of the invention determine the characteristic parameters of the object to be processed by realizing the frequency value of the optimal frequency matching, do not need the user to manually input the characteristic parameters of the object to be processed according to experience or measurement, and have high accuracy of the characteristic parameters.
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 device.
The food is unfrozen by the electromagnetic wave heating device, 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 end of thawing is generally determined by setting time by a user, which not only imposes an excessive demand on the user and easily causes overcooling or overheating of food after thawing, but also causes problems of uneven thawing and local overheating due to differences in penetration and absorption of water and ice by microwaves, uneven distribution of substances in the food, and large amount of energy absorbed by a melted region.
Disclosure of Invention
It is an object of the first aspect of the present invention to provide a control method for an electromagnetic wave heating apparatus, which employs a new, more preferable method for determining a characteristic parameter of an object to be treated.
It is a further object of the first aspect of the invention to improve the efficiency of obtaining frequency values that achieve optimal frequency matching.
It is another further object of the invention to improve the accuracy of the characteristic parameters.
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 a cavity capacitor for placing an object to be treated and an electromagnetic wave generating module generating an electromagnetic wave signal for heating the object to be treated, the control method comprising:
determining characteristic parameters of the object to be processed according to the capacitance value of the cavity capacitor;
and controlling the electromagnetic wave generation module to work according to the characteristic parameters.
Optionally, the step of determining a characteristic parameter of the object to be processed according to the capacitance value of the cavity capacitor includes:
controlling the electromagnetic wave generation module to generate an electromagnetic wave signal with preset initial power;
adjusting the frequency of the electromagnetic wave signal in the alternative frequency interval, and determining the frequency value of the electromagnetic wave signal for realizing the optimal frequency matching of the cavity capacitor;
and determining the characteristic parameters of the object to be processed according to the frequency values.
Optionally, after the step of determining the characteristic parameter of the object to be processed according to the frequency value, the method further includes:
re-determining the frequency value of the electromagnetic wave signal achieving the optimal frequency matching between the minimum value of the candidate frequency interval and the frequency value.
Optionally, the step of adjusting the frequency of the electromagnetic wave signal in the alternative frequency interval and determining the frequency value of the electromagnetic wave signal that achieves the optimal frequency matching of the cavity capacitance includes:
and adjusting the frequency of the electromagnetic wave signal in the alternative frequency interval in a dichotomy mode, gradually reducing a frequency approximation interval for realizing optimal frequency matching to a minimum approximation interval, and determining the frequency value of the electromagnetic wave signal for realizing optimal frequency matching.
Optionally, the step of adjusting the frequency of the electromagnetic wave signal in the candidate frequency interval in a bisection manner, and gradually reducing the frequency approximation interval for achieving the optimal frequency matching to the minimum approximation interval includes:
adjusting the frequency of the electromagnetic wave signal to be the minimum value, the intermediate value and the maximum value of the frequency approximation interval, and acquiring matching degree parameters corresponding to each frequency and reflecting the frequency matching degree of the cavity capacitor;
comparing the matching degree parameters of the frequencies;
re-determining the frequency approximation interval according to the comparison result; wherein the initial frequency approximation interval is the candidate frequency interval.
Optionally, the step of adjusting the frequency of the electromagnetic wave signal in the alternative frequency interval and determining the frequency value of the electromagnetic wave signal that achieves the optimal frequency matching of the cavity capacitance includes:
adjusting the frequency of the electromagnetic wave signal to increase from the minimum value of the alternative frequency interval to the maximum value of the alternative frequency interval by increasing a preset step length each time, and acquiring a matching degree parameter corresponding to each frequency and reflecting the frequency matching degree of the cavity capacitor;
comparing the matching degree parameters of the frequencies;
and determining a frequency value for realizing optimal frequency matching according to the comparison result.
Optionally, the step of adjusting the frequency of the electromagnetic wave signal in the alternative frequency interval and determining the frequency value of the electromagnetic wave signal for achieving the optimal frequency matching of the cavity capacitance further includes:
after the frequency of the electromagnetic wave signal is adjusted every time, acquiring a forward power signal output by the electromagnetic wave generation module and a reverse power signal returned to the electromagnetic wave generation module;
and calculating the matching degree parameter of the frequency according to the forward power signal and the reverse power signal.
Optionally, the step of determining the characteristic parameter of the object to be processed according to the frequency value includes:
and matching corresponding characteristic parameters according to the frequency value and a preset comparison table, wherein the comparison table records the corresponding relation between the frequency value and the characteristic parameters.
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 comparison table records correspondence at different initial temperatures, and the step of matching the corresponding characteristic parameters according to the frequency value and according to a preset comparison table includes:
acquiring the initial temperature of an object to be processed;
matching the corresponding relation according to the initial temperature, and further matching corresponding characteristic parameters according to the corresponding relation by combining a frequency value for realizing optimal frequency matching; wherein
The characteristic parameters are weight and/or heating time and/or heating power for heating to a set temperature.
Optionally, the comparison table records correspondence relationships under different weights of the objects to be processed, and the step of matching corresponding characteristic parameters according to the frequency value and a preset comparison table includes:
acquiring the weight of an object to be treated;
matching the corresponding relation according to the weight, and further matching corresponding characteristic parameters according to the corresponding relation by combining a frequency value for realizing optimal frequency matching; wherein
The characteristic parameter is an initial temperature and/or a heating time and/or a heating power for heating to a set temperature.
Optionally, the set temperature is-4 to 0 ℃; and/or
The minimum value of the alternative frequency interval is 32-38 MHz; and/or
The maximum value of the alternative frequency interval is 42-48 MHz.
Optionally, a matching degree parameter reflecting a frequency matching degree of the cavity capacitance is return loss; and the control method further comprises:
judging whether the frequency value is greater than or equal to a preset upper 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 the electromagnetic wave signal with the frequency value by presetting heating power.
Optionally, a matching degree parameter reflecting a frequency matching degree of the cavity capacitance is return loss; and the control method further comprises:
judging whether the frequency value 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 the electromagnetic wave signal with the frequency value by presetting heating power.
Optionally, the control method further includes:
when the frequency value is greater than or equal to the preset upper limit threshold value, sending a visual and/or auditory signal prompting no-load to a user; and/or
And when the frequency value is less than or equal to the preset lower limit threshold value, sending a visual and/or auditory signal for prompting overload to the user.
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; and
a controller configured to perform any of the control methods described above.
The heating device and the control method thereof determine the characteristic parameters of the object to be processed through the capacitance value of the cavity capacitor, do not need a user to manually input the characteristic parameters of the object to be processed according to experience or measurement, and have high accuracy. Particularly, the capacitance value of the cavity capacitor is reflected by the frequency value of the optimal frequency matching, and sensing devices for sensing the corresponding characteristic parameters in the cavity capacitor are reduced, so that the cost is saved, and the errors of the characteristic parameters are further reduced.
Furthermore, the frequency value for realizing the optimal frequency matching is determined in the alternative frequency interval by the dichotomy, the range of the interval where the optimal frequency value is located can be quickly reduced, the optimal frequency value is further quickly determined, the time for determining the characteristic parameters of the object to be processed is shortened, and the user experience is greatly improved.
Furthermore, the invention determines the characteristic parameters of the object to be processed by combining the frequency value for realizing the optimal frequency matching with the comparison table, namely, the characteristic parameters of the object to be processed are determined through the capacitance value range of the cavity capacitor.
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 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 flow chart diagram of a control method for a heating apparatus according to one embodiment of the present invention;
FIG. 4 is a schematic flow chart diagram for determining a characteristic parameter of an object to be processed based on a capacitance value of a cavity capacitance according to one embodiment of the present invention;
FIG. 5 is a schematic flow chart of adjusting the frequency of an electromagnetic wave signal within an alternative frequency interval and determining the frequency value of the electromagnetic wave signal that achieves an optimal frequency matching of the cavity capacitance according to one embodiment of the present invention;
FIG. 6 is a schematic flow chart diagram of adjusting the frequency of an electromagnetic wave signal within an alternative frequency interval and determining the frequency value of the electromagnetic wave signal that achieves optimal frequency matching of the cavity capacitance, according to another embodiment of the present invention;
FIG. 7 is a schematic flow chart diagram of determining whether the cavity capacitance is empty or overloaded according to one embodiment of the present invention;
fig. 8 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, and a controller 130.
Specifically, the cavity capacitor 110 may include a cavity for placing the object 140 to be processed and a radiation plate disposed in the cavity. In some embodiments, a receiving plate may be further 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 140 to be processed in the cavity capacitor 110. The electromagnetic wave generating module 120 may include a variable frequency source and a power amplifier, among others.
Fig. 2 is a schematic block diagram of the controller 130 of fig. 1. Referring to fig. 2, the controller 130 may include a processing unit 131 and a storage unit 132. Wherein the storage unit 132 stores a computer program 133, the computer program 133 being adapted to realize the control method of an embodiment of the invention when executed by the processing unit 131.
In particular, the processing unit 131 may be configured to determine a characteristic parameter of the object to be processed according to the capacitance value of the cavity capacitor, and further control the electromagnetic wave generating module 120 to operate according to the characteristic parameter.
The heating device of the invention determines the characteristic parameters of the object to be processed through the capacitance value of the cavity capacitor, and the characteristic parameters of the object to be processed do not need to be manually input by a user according to experience or measurement, and the accuracy of the characteristic parameters is high.
In the present invention, the characteristic parameter may be one or a combination of more parameters of weight, temperature, heating time to a set temperature, and heating power according to the requirements of practical application.
The electromagnetic wave generating module 120 can be directly controlled by the characteristic parameter or indirectly controlled by the characteristic parameter. For example, the characteristic parameter is weight, and the processing unit 131 is configured to determine heating time and heating power according to the weight and the type of the object to be processed, and control the electromagnetic wave generating module 120 to operate according to the heating time and the heating power.
In some embodiments, the processing unit 131 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 frequency of the electromagnetic wave signal generated by the electromagnetic wave generation module 120 in the alternative frequency interval, determine a frequency value of the electromagnetic wave signal that achieves the optimal frequency matching of the cavity capacitor 110, and further determine the characteristic parameter of the object to be processed 140 according to the frequency value that achieves the optimal frequency matching.
According to the resonant frequency calculation formula f = 1/(2 pi · sqrt (L · C), when the capacitance value C of the cavity capacitor 110 changes due to the different objects 140 to be processed being placed in the same heating apparatus 100 (the inductance L remains unchanged), the resonant frequency f suitable for the cavity capacitor 110 also changes.
The heating device of the invention reflects the capacitance value of the cavity capacitor 110 by realizing the frequency value of the optimal frequency matching, reduces the sensing devices for sensing the corresponding characteristic parameters in the cavity capacitor, further saves the cost and further reduces the errors of the characteristic parameters.
In the present invention, the optimal frequency matching of the cavity capacitor 110 means that the proportion of the output power distributed to the cavity capacitor 110 by the electromagnetic wave generation module 120 is the largest under the same heating device.
In the invention, the preset initial power can be 10-20W, such as 10W, 15W or 20W, so as to obtain a frequency value with high accuracy for realizing optimal frequency matching while saving energy.
In the present invention, the minimum value of the alternative frequency interval may be 32 to 38MHz, and the maximum value may be 42 to 48MHz, so as to improve the penetration of the electromagnetic wave and achieve uniform heating. For example, the candidate frequency ranges are 32 to 48MHz, 35 to 45MHz, 38 to 42MHz, and the like.
In some embodiments, the processing unit 131 may be configured to adjust the frequency of the electromagnetic wave signal within the candidate frequency interval in a dichotomy manner, gradually reduce the frequency approximation interval for achieving the optimal frequency matching to the minimum approximation interval, and further determine the frequency value of the electromagnetic wave signal for achieving the optimal frequency matching.
Specifically, the processing unit 131 may be configured to adjust the frequency of the electromagnetic wave signal to be the minimum value, the intermediate value, and the maximum value of the frequency approximation interval, respectively obtain the matching degree parameters corresponding to each frequency and reflecting the frequency matching degree of the cavity capacitor 110 for comparison, re-determine the frequency approximation interval according to the comparison result, and so forth until the frequency approximation interval is the minimum approximation interval, adjust the frequency of the electromagnetic wave signal to be the minimum value, the intermediate value, and the maximum value of the minimum approximation interval, respectively obtain the matching degree parameters corresponding to each frequency and reflecting the frequency matching degree of the cavity capacitor 110 for comparison, and determine the optimal frequency value according to the comparison result. Wherein, the initial frequency approximation interval may be the aforementioned alternative frequency interval.
The heating device 100 of the invention determines the frequency value for realizing the optimal frequency matching in the alternative frequency interval by the dichotomy, can quickly reduce the range of the interval where the optimal frequency value is located, further quickly determine the optimal frequency value, shorten the time for determining the characteristic parameters of the object to be processed 140, and greatly improve the user experience.
It should be noted that, in the present invention, the minimum approximation interval is not an interval of a specific frequency range, but a minimum range of a frequency approximation interval, that is, the precision of an optimal frequency value. In some embodiments, the minimum approximation interval may be any value of 0.2-20 KHz, such as 0.2KHz, 1KHz, 5KHz, 10KHz, or 20KHz.
In other embodiments, the processing unit 131 may be configured to adjust the frequency of the electromagnetic wave signal to increase from the minimum value of the candidate frequency interval to the maximum value of the candidate frequency interval by increasing a preset step each time, obtain a matching degree parameter corresponding to each frequency and reflecting the frequency matching degree of the cavity capacitor 110, compare the matching degree parameters, and determine the optimal frequency value according to the comparison result.
In the present invention, the predetermined step may be 0.1 to 10KHz, such as 0.1KHz, 0.5KHz, 1KHz, 5KHz, or 10 KHz.
The time interval between two adjacent times of adjusting the frequency of the electromagnetic wave signal may be 10 to 20ms, such as 10ms, 15ms, or 20 ms.
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 generating module 120, for monitoring the forward power signal output by the electromagnetic wave generating module 120 and the reverse power signal returned to the electromagnetic wave generating module 120 in real time.
The processing unit 131 may be further configured to obtain 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 frequency of the electromagnetic wave signal 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 a formula S11= -20log (reverse power/forward power), in this embodiment, the smaller the value of the return loss S11, the higher the frequency matching degree of the cavity capacitor 110 is reflected, and the frequency value corresponding to the minimum return loss S11 is the frequency value for achieving the optimal frequency matching.
The matching degree parameter may also be an electromagnetic wave absorption rate, which can be calculated according to the formula electromagnetic wave absorption rate = (1-reverse power/forward power), in this embodiment, the larger the value of the electromagnetic wave absorption rate is, the higher the frequency matching degree of the cavity capacitor 110 is reflected, and the frequency value corresponding to the maximum electromagnetic wave absorption rate is the frequency value for achieving the optimal frequency 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 132 may store a pre-configured comparison table, in which the correspondence between the frequency values and the characteristic parameters is recorded. The processing unit 131 may be configured to match the corresponding characteristic parameters according to a preset lookup table according to the frequency value for achieving the optimal frequency matching.
The heating device 100 of the present invention determines the characteristic parameter of the object 140 to be processed by combining the frequency value for realizing the optimal frequency matching with the comparison table, that is, the characteristic parameter of the object 140 to be processed is determined by 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 140 to be processed according to the capacitance value, the cost of the measuring device is saved, and the inventor of the present application creatively finds that the characteristic parameter is determined by the capacitance value range, the error of the measuring device can be contained, the characteristic parameter with higher accuracy can be obtained, and further, the excellent heating effect can be 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 frequency value according to the comparison table, so as to simplify the acquisition 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 131 may be further configured to obtain an initial temperature of the object 140 to be processed, match the corresponding relationship according to the initial temperature, and further match the corresponding characteristic parameter according to the corresponding relationship and the frequency 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 corresponding relationship between the weights of the objects 140 to be treated is recorded in the comparison table. The processing unit 131 may be further configured to obtain the weight of the object 140 to be processed, match the corresponding relationship according to the weight, and further match the corresponding characteristic parameter according to the corresponding relationship and the frequency 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 some embodiments, the variable frequency source may be a voltage controlled oscillator whose input voltage corresponds to the output frequency. The processing unit 131 may be configured to determine a characteristic parameter of the object 140 to be processed according to the input voltage of the voltage controlled oscillator.
In some embodiments, the processing unit 131 may be configured to control the electromagnetic wave generating module 120 to stop working when the optimal frequency value is greater than or equal to the preset upper threshold value, so as to avoid that the weight of the object to be processed 140 is too small, which causes the variable frequency source to generate heat and seriously reduces the heating efficiency, and causes a potential safety hazard due to too much heat; and when the optimal frequency value is less than or equal to the preset lower limit threshold value, controlling the electromagnetic wave generation module 120 to stop working so as to avoid the excessive weight and poor heating effect of the object to be processed 140. In the present invention, the preset upper threshold may be the maximum value of the candidate frequency interval or a frequency value 2-3 MHz smaller than the maximum value, and the preset lower threshold may be the minimum value of the candidate frequency interval or a frequency value 2-3 MHz larger than the maximum value.
When the optimal frequency value is greater than the preset lower threshold and less than the preset upper threshold, the processing unit 131 may be configured to control the electromagnetic wave generation module 120 to generate an electromagnetic wave signal with the optimal frequency value within the preset heating time with the preset heating power, and start to heat the object 140 to be processed. The preset heating time and the preset heating power are obtained by matching frequency values according to a preset comparison table.
After the object 140 to be processed is heated, the processing unit 131 may be further configured to re-determine the frequency value of the electromagnetic wave signal for achieving the optimal frequency matching between the minimum value and the frequency value of the candidate frequency interval, and control the electromagnetic wave generation module 120 to generate the electromagnetic wave signal with a new optimal frequency value, so as to improve the heating efficiency and simplify the control process.
The heating device 100 of the invention realizes frequency matching by adjusting frequency, and compared with a load matching circuit of the electromagnetic wave generating module 120 adjusted by a switching device, the invention avoids the stray signals and noises generated when the switching device is switched on and off, and avoids the influence on the whole set of matching circuit caused by the damage of individual switching device, thereby improving the working stability of the heating device 100 and reducing the cost of the heating device 100.
In some embodiments, the heating device 100 may also include an interaction module for sending a visual and/or audible signal to the user. The processing unit 131 may be further configured to control the interaction module to send a visual and/or audible signal prompting idling to the user when the optimal frequency value is greater than or equal to the preset upper threshold; and when the optimal frequency value is less than or equal to the preset lower limit threshold, controlling the interaction module to send a visual and/or auditory signal for prompting overload to the user so as to improve the user experience.
Fig. 3 is a schematic flow chart of a control method for the heating apparatus 100 according to an embodiment of the present invention. Referring to fig. 3, the control method for the heating apparatus 100 performed by the controller 130 of any of the above embodiments of the present invention may include the steps of:
step S302: and determining characteristic parameters of the object to be processed according to the capacitance value of the cavity capacitor. Wherein, the characteristic parameter can be one or a combination of a plurality of parameters of weight, temperature, heating time for heating to set temperature and heating power according to the requirement of practical application.
Step S304: and controlling the electromagnetic wave generation module to work according to the characteristic parameters. In this step, the electromagnetic wave generating module 120 may be directly controlled by the characteristic parameter or indirectly controlled by the characteristic parameter. For example, the characteristic parameter is weight, and the processing unit 131 is configured to determine heating time and heating power according to the weight and the type of the object to be processed, and control the electromagnetic wave generation module 120 to operate according to the heating time and the heating power.
The control method of the invention determines the characteristic parameters of the object to be processed through the capacitance value of the cavity capacitor, does not need the user to manually input the characteristic parameters of the object to be processed according to experience or measurement, and has high accuracy of the characteristic parameters.
Fig. 4 is a schematic flow chart of determining a characteristic parameter of an object to be processed according to a capacitance value of a cavity capacitance according to an embodiment of the present invention. Referring to fig. 4, the determining the characteristic parameter of the object to be processed according to the capacitance value of the cavity capacitor of the present invention may comprise the steps of:
step S402: the electromagnetic wave generation module 120 is controlled to generate an electromagnetic wave signal with a preset initial power. The preset initial power may be 10-20W, for example, 10W, 15W or 20W, so as to obtain a frequency value with high accuracy for implementing optimal frequency matching while saving energy.
Step S404: the frequency of the electromagnetic wave signal is adjusted within the alternative frequency interval and the frequency value of the electromagnetic wave signal that achieves the optimal frequency matching of the cavity capacitance 110 is determined. The minimum value of the alternative frequency interval can be 32-38 MHz, and the maximum value can be 42-48 MHz, so as to improve the penetrability of the electromagnetic wave and realize uniform heating. For example, the candidate frequency ranges are 32 to 48MHz, 35 to 45MHz, 38 to 42MHz, and the like.
Step S406: and determining the characteristic parameters of the object 140 to be processed according to the frequency values.
The control method of the invention reflects the capacitance value of the cavity capacitor by realizing the frequency value of the optimal frequency matching, reduces the sensing devices for correspondingly sensing the characteristic parameters in the cavity capacitor, further saves the cost and further reduces the errors of the characteristic parameters.
In some embodiments, step S406 may match the corresponding characteristic parameters according to the frequency values according to a preset mapping table. Wherein, the corresponding relation between the frequency value and the characteristic parameter is recorded in the comparison table.
In some further embodiments, only one corresponding relationship is recorded in the comparison table, and in step S406, the characteristic parameter can be directly obtained from the frequency value according to the comparison table, so as to simplify the obtaining process of the characteristic parameter.
In still further embodiments, the mapping table records the corresponding relationship at different initial temperatures, and step S406 may include the following steps:
acquiring the initial temperature of the object to be processed 140;
and matching the corresponding characteristic parameters according to the initial temperature matching corresponding relation and the frequency 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 parameters. Wherein the characteristic parameter may be one or a combination of more of weight, heating time to set temperature, and heating power.
In still further embodiments, the corresponding relationship of different weights of the objects 140 to be processed is recorded in the comparison table, and the step S406 may include the following steps:
acquiring the weight of the object 140 to be processed;
and matching the corresponding relation according to the weight, and further matching the corresponding characteristic parameters according to the corresponding relation and the frequency 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 parameters. Wherein the characteristic parameter can be one or more of the initial temperature, the heating time for heating to the set temperature, and the heating power.
The control method of the invention determines the characteristic parameter of the object 140 to be processed by combining the frequency value for realizing the optimal frequency matching with the comparison table, namely, the characteristic parameter of the object 140 to be processed is determined by 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 140 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 by the capacitance value range, the error of the measuring device can be contained, the characteristic parameter with higher accuracy can be obtained, and further, the excellent heating effect can be obtained.
In some embodiments, a step of re-determining the frequency value of the electromagnetic wave signal achieving the optimal frequency matching between the minimum value of the alternative frequency interval and the frequency value may also be included after step S406.
Compared with the load matching circuit of the electromagnetic wave generation module 120 adjusted by the switching device, the control method of the invention realizes frequency matching by adjusting the frequency, avoids the stray signals and noises generated when the switching device is switched on and off, avoids the influence on the whole set of matching circuit caused by the damage of individual switching device, further improves the working stability of the heating device 100 and reduces the cost of the heating device 100.
In some embodiments, step S404 may be to adjust the frequency of the electromagnetic wave signal in the candidate frequency interval in a dichotomy manner, gradually reduce the frequency approximation interval for achieving the optimal frequency matching to the minimum approximation interval, and determine the frequency value of the electromagnetic wave signal for achieving the optimal frequency matching.
Figure 5 is a schematic flow chart of adjusting the frequency of an electromagnetic wave signal within an alternative frequency interval and determining the frequency value of the electromagnetic wave signal that achieves optimal frequency matching of the cavity capacitance 110, according to one embodiment of the present invention. Referring to fig. 5, adjusting the frequency of the electromagnetic wave signal in the alternative frequency interval and determining the frequency value of the electromagnetic wave signal for achieving the optimal frequency matching of the cavity capacitance 110 according to an embodiment of the present invention may include the following steps:
step S502: and acquiring an initial frequency approximation interval. Wherein, the initial frequency approximation interval may be the aforementioned alternative frequency interval.
Step S504: and adjusting the frequency of the electromagnetic wave signal to be the minimum value, the intermediate value and the maximum value of the frequency approximation interval, and acquiring matching degree parameters which correspond to all frequencies and reflect the frequency matching degree of the cavity capacitor 110.
Step S506: and comparing the matching degree parameters of the frequencies.
Step S508: and judging whether the frequency approximation interval is the minimum approximation interval or not. If yes, go to step S510; if not, go to step S512. The minimum approximation interval is not an interval of a specific frequency range, but the minimum range of the frequency approximation interval, that is, the precision of the optimal frequency value. In some embodiments, the minimum approximation interval may be any value from 0.2 to 20KHz, such as 0.2KHz, 1KHz, 5KHz, 10KHz, or 20KHz.
Step S510: and determining the frequency value of the electromagnetic wave signal realizing the optimal frequency matching according to the comparison result.
Step S512: and re-determining the frequency approximation interval according to the comparison result. Returning to step S504.
The control method of the invention determines the frequency value for realizing the optimal frequency matching in the alternative frequency interval by the dichotomy, can quickly reduce the range of the interval in which the optimal frequency value is positioned, further quickly determine the optimal frequency value, shorten the time for determining the characteristic parameters of the object to be processed 140 and greatly improve the user experience.
In other embodiments, step S404 may be to adjust the frequency of the electromagnetic wave signal to increase from the minimum value of the candidate frequency interval to the maximum value of the candidate frequency interval by increasing the preset step each time, obtain a matching degree parameter corresponding to each frequency and reflecting the frequency matching degree of the cavity capacitor 110, compare the matching degree parameters of each frequency, and determine a frequency value for achieving the optimal frequency matching according to the comparison result. That is, the optimum frequency value is determined by traversing the selectable frequencies of the electromagnetic wave signal.
Figure 6 is a schematic flow chart of adjusting the frequency of an electromagnetic wave signal in an alternative frequency interval and determining the frequency value of the electromagnetic wave signal that achieves an optimal frequency matching of the cavity capacitance 110 according to another embodiment of the present invention. Referring to fig. 6, adjusting the frequency of the electromagnetic wave signal in the alternative frequency interval and determining the frequency value of the electromagnetic wave signal for achieving the optimal frequency matching of the cavity capacitance 110 according to another embodiment of the present invention may comprise the steps of:
step S602: adjusting the frequency f of the electromagnetic wave signal to be the minimum value f of the alternative frequency interval min Obtaining a matching degree parameter corresponding to the frequency and reflecting the frequency matching degree of the cavity capacitor 110。
Step S604: judging whether the current frequency f is the maximum value f of the alternative frequency interval max . If yes, go to step S606; if not, go to step S608.
Step S606: and comparing the matching degree parameters of the frequencies.
Step S608: and determining the frequency value of the electromagnetic wave signal for realizing the optimal frequency matching according to the comparison result.
Step S610: and adjusting the frequency f of the electromagnetic wave signal to increase by a preset step length k, and acquiring a matching degree parameter corresponding to the frequency and reflecting the frequency matching degree of the cavity capacitor 110. The process returns to step S604. Wherein, the preset step k can be 0.1-10 KHz, such as 0.1KHz, 0.5KHz, 1KHz, 5KHz, or 10 KHz.
In some embodiments, obtaining the matching degree parameter may include the following steps:
after the frequency of the electromagnetic wave signal is adjusted each time, acquiring 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; wherein, the forward power signal and the reverse power signal can be measured by a bidirectional coupler connected in series between the cavity capacitor 110 and the electromagnetic wave generating module 120.
And calculating the matching degree parameter of the frequency according to the forward power signal and the reverse power signal.
Specifically, the matching parameter may be the 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 frequency matching degree of the cavity capacitor 110 is reflected, and the frequency value corresponding to the minimum return loss S11 is the frequency value for achieving the optimal frequency matching.
The matching degree parameter may also be an electromagnetic wave absorption rate, which can be calculated according to a formula electromagnetic wave absorption rate = (1-reverse power/forward power), in this embodiment, the larger the value of the electromagnetic wave absorption rate is, the higher the frequency matching degree of the cavity capacitor 110 is reflected, and the frequency value corresponding to the maximum electromagnetic wave absorption rate is the frequency value for achieving the optimal frequency 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.
Fig. 7 is a schematic flow chart of determining whether the cavity capacitor 110 is empty or overloaded according to an embodiment of the present invention. Referring to fig. 7, the determining whether the cavity capacitor 110 is empty or overloaded according to the present invention may include the following steps:
step S702: and judging whether the optimal frequency value is greater than or equal to a preset upper limit threshold value or not. If yes, go to step S704; if not, go to step S706. The preset upper threshold may be a maximum value of the candidate frequency interval or a frequency value 2-3 MHz smaller than the maximum value, and the preset lower threshold may be a minimum value of the candidate frequency interval or a frequency value 2-3 MHz larger than the maximum value.
Step S704: the electromagnetic wave generation module 120 is controlled to stop working, and a visual and/or audible signal prompting no-load is sent to a user, so that the situation that the variable frequency source generates heat to seriously reduce the heating efficiency and cause potential safety hazards due to overlarge heat caused by the fact that the weight of the object 140 to be processed is too small is avoided.
Step S706: and judging whether the optimal frequency value is less than or equal to a preset lower limit threshold value. If yes, go to step S708; if not, go to step S710.
Step S708: the electromagnetic wave generating module 120 is controlled to stop working, and a visual and/or auditory signal for prompting overload is sent to the user, so that the phenomenon that the weight of the object to be processed 140 is too large and the heating effect is too poor is avoided.
Step S710: the electromagnetic wave generation module 120 is controlled to generate an electromagnetic wave signal having a frequency value for achieving optimal frequency matching with a preset heating power. And the preset heating time and the preset heating power are obtained by matching frequency values according to a preset comparison table.
Fig. 8 is a detailed flowchart of a control method for the heating apparatus 100 according to an embodiment of the present invention. Referring to fig. 8, the control method for the heating apparatus 100 of the present invention may include the following detailed steps:
step S802: and acquiring a heating instruction.
Step S804: the initial frequency approximation interval and the initial temperature of the object to be processed 140 are obtained.
Step S806: the electromagnetic wave generation module 120 is controlled to generate an electromagnetic wave signal with a preset initial power.
Step S808: and adjusting the frequency of the electromagnetic wave signal to be the minimum value, the middle value and the maximum value of the frequency approximation interval, acquiring the forward power signal and the reverse power signal corresponding to each frequency, and calculating the return loss.
Step S810: the return loss of each frequency is compared.
Step S812: and judging whether the frequency approximation interval is the minimum approximation interval or not. If yes, go to step S816; if not, go to step S814.
Step S814: and re-determining the frequency approximation interval according to the comparison result. Return to step S808.
Step S816: and determining the frequency value of the electromagnetic wave signal realizing the optimal frequency matching according to the comparison result. Step S818 is performed.
Step S818: and judging whether the optimal frequency value is greater than or equal to a preset upper limit threshold value or not. If yes, go to step S820; if not, go to step S822.
Step S820: and controlling the electromagnetic wave generation module 120 to stop working and sending visual and/or audible signals for prompting no load to a user.
Step S822: and judging whether the optimal frequency value is less than or equal to a preset lower limit threshold value. If yes, go to step S824; if not, go to step S826.
Step S824: and controlling the electromagnetic wave generation module 120 to stop working and sending a visual and/or audible signal for prompting overload to the user.
Step S826: and matching the corresponding heating time and heating power according to the initial temperature matching corresponding relation and combining the frequency value.
Step S828: the electromagnetic wave generation module 120 is controlled to generate an electromagnetic wave signal with an optimal frequency value with heating power. Step S830 and step S832 are performed.
Step S830: the optimum frequency value is re-determined between the minimum value of the candidate frequency interval and the aforementioned frequency value until the thawing time is reached. Returning to step S828, the electromagnetic wave generation module 120 generates an electromagnetic wave signal of a new preferred frequency.
Step S832: it is determined whether the heating time has been reached, that is, whether the operation time of step S828 is equal to or greater than the heating time. If yes, go to step S834; if not, the process returns to step S828.
Step S834: the electromagnetic wave generation module 120 is controlled to stop operating. Returning to step S802, the next cycle is started.
The heating device 100 and the control method of the invention are particularly suitable for unfreezing food, in particular for unfreezing food to-4-0 ℃, namely the set temperature is-4-0 ℃, and more accurate characteristic parameter values can be obtained.
In other embodiments of the present invention, the heating apparatus may further include a matching module for adjusting a load impedance of the electromagnetic wave generating module by adjusting its own impedance, and the capacitance value of the cavity capacitor 110 is represented by an impedance value of the matching module. The processing unit 131 may be configured to determine the characteristic parameter of the object to be processed according to the impedance value of the matching module that achieves the optimal load matching.
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 (15)
1. A control method for a heating apparatus including a chamber capacitor for placing an object to be treated and an electromagnetic wave generating module for generating an electromagnetic wave signal for heating the object to be treated, the control method comprising:
determining characteristic parameters of the object to be processed according to the capacitance value of the cavity capacitor;
controlling the electromagnetic wave generation module to work according to the characteristic parameters; wherein the step of determining the characteristic parameters of the object to be treated according to the capacitance value of the cavity capacitor comprises the following steps:
controlling the electromagnetic wave generation module to generate an electromagnetic wave signal with preset initial power; adjusting the frequency of the electromagnetic wave signal in the alternative frequency interval, and determining the frequency value of the electromagnetic wave signal for realizing the optimal frequency matching of the cavity capacitor;
and determining the characteristic parameters of the object to be processed according to the frequency values.
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 frequency value:
re-determining the frequency value of the electromagnetic wave signal achieving the optimal frequency matching between the minimum value of the candidate frequency interval and the frequency value.
3. The control method according to claim 1, wherein the step of adjusting the frequency of the electromagnetic wave signal within a candidate frequency interval and determining the frequency value of the electromagnetic wave signal that achieves the optimal frequency matching of the cavity capacitance comprises:
and adjusting the frequency of the electromagnetic wave signal in the alternative frequency interval in a dichotomy mode, gradually reducing a frequency approximation interval for realizing optimal frequency matching to a minimum approximation interval, and determining the frequency value of the electromagnetic wave signal for realizing optimal frequency matching.
4. The control method according to claim 3, wherein the step of adjusting the frequency of the electromagnetic wave signal within the candidate frequency interval in a bisection manner, and gradually narrowing the frequency approximation interval for achieving optimum frequency matching to a minimum approximation interval, comprises:
adjusting the frequency of the electromagnetic wave signal to be the minimum value, the intermediate value and the maximum value of the frequency approximation interval, and acquiring matching degree parameters corresponding to each frequency and reflecting the frequency matching degree of the cavity capacitor;
comparing the matching degree parameters of the frequencies;
re-determining the frequency approximation interval according to the comparison result; wherein the initial frequency approximation interval is the candidate frequency interval.
5. The control method according to claim 1, wherein the step of adjusting the frequency of the electromagnetic wave signal within a candidate frequency interval and determining the frequency value of the electromagnetic wave signal that achieves the optimal frequency matching of the cavity capacitance comprises:
adjusting the frequency of the electromagnetic wave signal to increase from the minimum value of the alternative frequency interval to the maximum value of the alternative frequency interval by increasing a preset step length each time, and acquiring a matching degree parameter corresponding to each frequency and reflecting the frequency matching degree of the cavity capacitor;
comparing the matching degree parameters of the frequencies;
and determining a frequency value for realizing the optimal frequency matching according to the comparison result.
6. The control method according to claim 4 or 5, wherein the step of adjusting the frequency of the electromagnetic wave signal within a candidate frequency interval and determining the frequency value of the electromagnetic wave signal that achieves an optimal frequency matching of the cavity capacitance further comprises:
after the frequency of the electromagnetic wave signal is adjusted every time, acquiring a forward power signal output by the electromagnetic wave generation module and a reverse power signal returned to the electromagnetic wave generation module;
and calculating the matching degree parameter of the frequency according to the forward power signal and the reverse power signal.
7. The control method according to claim 1, wherein the step of determining the characteristic parameter of the object to be processed from the frequency value comprises:
and matching the corresponding characteristic parameters according to the frequency values and a preset comparison table, wherein the comparison table records the corresponding relation between the frequency values and the characteristic parameters.
8. The control method according to claim 7,
the characteristic parameters are weight and/or temperature and/or heating time and/or heating power for heating to a set temperature.
9. The control method according to claim 7, wherein the look-up table records correspondence at different initial temperatures, and the step of matching corresponding characteristic parameters according to the frequency value and according to a preset look-up table comprises:
acquiring the initial temperature of an object to be treated;
matching the corresponding relation according to the initial temperature, and further matching corresponding characteristic parameters according to the corresponding relation by combining frequency values for realizing optimal frequency matching; wherein
The characteristic parameters are weight and/or heating time and/or heating power for heating to a set temperature.
10. The control method according to claim 7, wherein the look-up table records corresponding relationships under different weights of the objects to be treated, and the step of matching corresponding characteristic parameters according to the frequency values and according to a preset look-up table comprises:
acquiring the weight of an object to be treated;
matching the corresponding relation according to the weight, and further matching corresponding characteristic parameters by combining a frequency value for realizing optimal frequency matching according to the corresponding relation; wherein
The characteristic parameter is an initial temperature and/or a heating time and/or a heating power for heating to a set temperature.
11. The control method according to any one of claims 8 to 10,
the set temperature is-4 to 0 ℃; and/or
The minimum value of the alternative frequency interval is 32-38 MHz; and/or
The maximum value of the alternative frequency interval is 42-48 MHz.
12. The control method according to claim 1, characterized in that the matching degree parameter reflecting the frequency matching degree of the cavity capacitance is return loss; and the control method further comprises:
judging whether the frequency value is greater than or equal to a preset upper 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 the electromagnetic wave signal with the frequency value by presetting heating power.
13. The control method according to claim 1, characterized in that a matching degree parameter reflecting a frequency matching degree of the cavity capacitance is a return loss; and the control method further comprises:
judging whether the frequency value 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 the electromagnetic wave signal with the frequency value by presetting heating power.
14. The control method according to claim 1, characterized by further comprising:
when the frequency value is greater than or equal to a preset upper limit threshold value, sending a visual and/or auditory signal prompting no load to a user; and/or
And when the frequency value is less than or equal to a preset lower threshold value, sending a visual and/or auditory signal for prompting overload to a user.
15. 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; and
a controller configured to perform the control method of any one of claims 1-14.
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| JPS5833303A (en) * | 1981-08-21 | 1983-02-26 | Fuji Electron Component Kk | Microwave electric power generator |
| US4615405A (en) * | 1985-04-16 | 1986-10-07 | Sharp Kabushiki Kaisha | Food weight measuring device for a cooking appliance |
| US5565655A (en) * | 1992-11-19 | 1996-10-15 | Goldstar Co., Ltd. | Method of detecting food weight in microwave oven by processing weight sensor signals |
| KR950002891Y1 (en) * | 1993-01-12 | 1995-04-17 | 주식회사 금성사 | Weight sensor for microwave oven |
| KR0128554B1 (en) * | 1994-07-25 | 1998-04-09 | 배순훈 | Weight sensing device of microwave-oven |
| WO2016096442A1 (en) * | 2014-12-17 | 2016-06-23 | Koninklijke Philips N.V. | A method and apparatus for determinging size information of food ingredients |
| US10720310B2 (en) * | 2017-09-14 | 2020-07-21 | Cellencor, Inc. | High-power solid-state microwave generator for RF energy applications |
| CN109922552A (en) * | 2018-12-24 | 2019-06-21 | 沈明水 | A kind of electromagnetic wave connection heating device |
| CN110366285A (en) * | 2019-08-27 | 2019-10-22 | 上海点为智能科技有限责任公司 | Defrosting heating equipment and method including mobile electrode |
| CN110493909B (en) * | 2019-08-27 | 2022-09-30 | 上海点为智能科技有限责任公司 | Distributed radio frequency or microwave thawing equipment |
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