CN113079603A - Control method for heating device and heating device - Google Patents
Control method for heating device and heating device Download PDFInfo
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- CN113079603A CN113079603A CN202010011074.0A CN202010011074A CN113079603A CN 113079603 A CN113079603 A CN 113079603A CN 202010011074 A CN202010011074 A CN 202010011074A CN 113079603 A CN113079603 A CN 113079603A
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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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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 generating module for generating an electromagnetic wave signal for heating the object to be treated. The control method comprises the following steps: acquiring the capacitance variation of the cavity capacitance and the weight of the object to be processed; and determining the food material type of the object to be processed according to the capacitance variation and the weight. According to the food material type automatic determination device and the food material type automatic determination method, the food material type of the object to be processed is automatically determined through the capacitance variation of the cavity capacitor after the object to be processed is placed and the weight of the object to be processed, the use requirement of a user is reduced, and the accuracy of the food material type is improved.
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 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, there are problems that a user has to input a food material type manually and unfreeze the food material type, or an image recognition device such as a camera recognizes the food type and unfreezes the food material, which puts an excessive demand on the user, or the image recognition device needs to have high image recognition accuracy and anti-electromagnetic wave interference capability.
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 heating effect.
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, wherein the control method includes:
acquiring the capacitance variation of the cavity capacitance and the weight of the object to be processed;
and determining the food material type of the object to be processed according to the capacitance variation and the weight.
Optionally, the control method further includes:
determining the heating power of the electromagnetic wave signal for heating the object to be processed according to the food material type; and/or
And determining the heating time for heating the object to be treated according to the food material type and the weight.
Optionally, the heating apparatus further includes a matching module for adjusting a load impedance of the electromagnetic wave generating module by adjusting its own impedance, wherein the step of obtaining a capacitance variation of the cavity capacitance includes:
controlling the electromagnetic wave generation module to generate an electromagnetic wave signal with preset initial power;
adjusting the impedance of the matching module and determining the impedance value of the matching module for realizing the optimal load matching of the electromagnetic wave generation module;
and determining the capacitance variation according to the impedance value.
Optionally, the matching module includes a plurality of matching branches that can be independently switched on and off, wherein the adjusting the impedance of the matching module and determining the impedance value of the matching module that achieves the optimal load matching of the electromagnetic wave generation module includes:
traversing the on-off combinations of the plurality of matching branches, and acquiring a matching degree parameter corresponding to each on-off combination and reflecting the load matching degree of the electromagnetic wave generation module;
comparing the matching degree parameters of the on-off combination of the plurality of matching branches;
and determining the on-off combination for realizing the optimal load matching and the impedance value corresponding to the on-off combination according to the comparison result.
Optionally, the step of traversing the on-off combinations of the plurality of matching branches and obtaining a matching degree parameter corresponding to each on-off combination and reflecting the load matching degree of the electromagnetic wave generation module includes:
acquiring a preset number set, wherein the number set comprises a combined number of on-off combination of the plurality of matching branches, and the combined number corresponds to the impedance value;
and determining the branch serial numbers of the matched branches corresponding to each combination serial number one by one according to the serial number set, and controlling the on-off of the corresponding matched branches according to the branch serial numbers.
Optionally, the step of obtaining the capacitance variation of the cavity capacitance 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 capacitance variation according to 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 control method further includes:
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 determining the optimal impedance matching or the most frequency matching according to the forward power signal and the reverse power signal.
Optionally, the heating device further includes a material-bearing vessel for bearing the object to be processed, and the material-bearing vessel is movable to take and place the object to be processed, and the control method further includes:
after the object bearing vessel is detected to move, acquiring a heating instruction;
and if the heating instruction is acquired, executing the step of acquiring the capacitance variation of the cavity capacitance and the weight of the object to be processed.
According to a second aspect of the present invention, there is provided a heating apparatus 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.
According to the food material type automatic determination device and the food material type automatic determination method, the food material type of the object to be processed is automatically determined through the capacitance variation of the cavity capacitor after the object to be processed is placed and the weight of the object to be processed, the use requirement of a user is reduced, and the accuracy of the food material type is improved.
Furthermore, the capacitance variation of the cavity capacitor after the object to be processed is placed is determined by the impedance value of the matching module for realizing the optimal load matching or the frequency value for realizing the optimal frequency matching, so that a measuring device for measuring the capacitance of the cavity capacitor is reduced, the cost is saved, the precision of the capacitance variation of the cavity capacitor is improved, the heating power and the heating time of the electromagnetic wave signal are improved, and the heating effect is improved.
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 flow chart diagram of a control method for a heating apparatus according to one embodiment of the present invention;
FIG. 5 is a schematic flow chart diagram of obtaining a capacitance change of a cavity capacitance according to one embodiment of the invention;
FIG. 6 is a schematic flow chart diagram of obtaining a capacitance variation of a cavity capacitance according to another embodiment of the invention;
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 structural view of a heating apparatus 100 according to an embodiment of the present invention. Referring to fig. 1, the heating apparatus 100 may include a cavity capacitor 110, an electromagnetic wave generation module 120, 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 and radiating plates.
The electromagnetic wave generating module 120 may be configured to generate an electromagnetic wave signal and electrically connect 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.
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 determine the heating power of the electromagnetic wave signal for heating the object 150 to be processed according to the food material type of the object 150 to be processed; the heating time for heating the object 150 to be processed is determined according to the type and weight of the food material of the object 150 to be processed, so as to reduce the phenomena of uneven heating and local overheating caused by different contents of the substances in different food materials.
In particular, the processing unit 141 may be configured to obtain a capacitance variation of the cavity capacitance 110 with respect to the empty load and a weight of the object 150 after obtaining the heating instruction, and determine the food material type of the object 150 according to the capacitance variation and the weight.
In some embodiments, the processing unit 141 may be configured to match the heating power according to the preset power comparison relationship directly according to the capacitance variation and the weight, or further match the heating power according to the food material type after determining the food material type of the object 150 to be processed.
The heating power may be substantially in positive correlation with the ratio of the capacitance variation to the weight, i.e., the larger the ratio of the capacitance variation to the weight is, the higher the corresponding heating power is, so as to reduce the local overheating of the object 150 to be processed.
In some embodiments, the processing unit 141 may be configured to match a time base of the heating time according to a preset time base comparison relationship according to the weight of the object 150 to be processed, match a time coefficient of the heating time according to a preset time coefficient comparison relationship according to the food material kind of the object 150 to be processed, and calculate the heating time according to the time base and the time coefficient.
The time base can be in positive correlation with the weight approximately, and the time coefficient can be in positive correlation with the ratio of the capacitance variation and the weight approximately, that is, the larger the weight is, the higher the corresponding heating power is, the larger the ratio of the capacitance variation and the weight is, the higher the corresponding heating power is, so as to avoid that the food material is locally overheated, and the power amplifier of the electromagnetic wave generation module 120 generates heat excessively, thereby affecting safety.
In some embodiments, the heating apparatus 100 may further include a material receiving tray 160 for receiving the material 150 to be processed. The boat 160 may be moved to take and place the object 150.
The processing unit 141 may be configured to obtain the heating command after detecting the movement of the boat 160, so as to save energy.
In some embodiments, the boat 160 may be provided with a load cell for measuring the weight of the object 150 to be processed.
In some embodiments, the heating device 100 further comprises a matching module 130. 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 processing unit 141 may be configured to control the electromagnetic wave generation module 120 to generate an electromagnetic wave signal with a preset initial power, adjust the impedance of the matching module 130 to perform load matching, determine the impedance value of the matching module 130 that realizes the optimal load matching of the electromagnetic wave generation module 120, and further determine the capacitance variation of the cavity capacitor 110 according to the impedance value of the matching module 130 that realizes the optimal load matching, so as to save cost and improve the accuracy of the capacitance variation of the cavity capacitor 110.
The capacitance variation of the cavity capacitor 110 can be obtained by calculating the impedance value of the matching module 130 for realizing the optimal load matching and the impedance value of the cavity capacitor 110 during no-load; or the capacitance value of the cavity capacitor 110 may be determined according to the impedance value of the matching module 130 for achieving the optimal load matching, and then compared with the capacitance value of the cavity capacitor 110 during idle load.
The matching module 130 may include a plurality of matching branches that may be independently switched on and off. The processing unit 141 may be further configured to traverse the on-off combinations of the multiple matching branches, obtain a matching degree parameter corresponding to each on-off combination and reflecting the load matching degree of the electromagnetic wave generation module 120, compare the matching degree parameters of the on-off combinations of the multiple matching branches, and determine, according to a comparison result, an on-off combination for achieving optimal load matching and an impedance value corresponding to the on-off combination.
Specifically, the storage unit 142 may store a preset number set, where the number set may include a combination number of on-off combinations of the plurality of matching branches, and the combination number corresponds to the impedance value of the matching module 130. The processing unit 141 may be further configured to obtain a preset number set after the heating instruction is obtained, determine the branch numbers of the matching branches corresponding to each combination number one by one according to the number set, and control the on/off of the corresponding matching branches according to the branch numbers, so as to implement traversing on the on/off combination of the multiple matching branches.
According to the heating device 100, each on-off combination and each matching branch of the matching module 130 are respectively numbered, so that the matching branch corresponding to each on-off combination can be rapidly matched for on-off in the process of determining the impedance value of the matching module 130 for realizing the optimal load matching of the electromagnetic wave generation module 120, the time required for determining the capacitance variation of the cavity capacitor 110 is further shortened, and the user experience is greatly improved.
The branch numbers of the matching branches can be sequentially 0 to n-1 power of a constant A, and the combination number can be the sum of the branch numbers of the conducting matching branches in the on-off combination, so that only one conducting matching branch can be accurately determined through the branch numbers. Where the constant a may be 2, 3, or 4, etc., and n is the number of matching branches. In the invention, the constant A can be 2, so that the storage space occupied by the number is reduced, and the matching efficiency is improved.
Fig. 3 is a schematic circuit diagram of the matching module 130 according to one embodiment of the present invention. Referring to fig. 3, in some further embodiments, the matching module 130 may include a first matching unit 131 connected in series between the electromagnetic wave generating module 120 and the cavity capacitance 110, and a second matching unit 132 having one end electrically connected between the first matching unit 131 and the cavity capacitance 110 and the other end grounded. The first matching unit 131 and the second matching unit 132 may respectively include a plurality of matching branches connected in parallel, and each matching branch includes a fixed-value capacitor and a switch, so that the reliability and the adjustment range of the matching module 130 are improved while the circuit is simple, and the acquired impedance value of the matching module 130 for realizing the optimal load matching is further improved.
The capacitance values of the constant capacitors of the second matching units 132 of the first matching unit 131 and the second matching unit 132 may be different, and the capacitance value of the minimum constant capacitor of the second matching unit 132 may be greater than the capacitance value of the maximum constant capacitor of the first matching unit 131. The serial numbers of the multiple branch circuits can be sequentially increased from small to large according to the capacitance values of the corresponding matching branch circuits.
Referring to fig. 3, the capacitance values of the capacitances C1, C2, …, Ca of the first matching unit 131 sequentially increase, the capacitance values of the capacitances Cx1, Cx2, …, Cxb (where a + b ═ n) of the second matching unit 132 sequentially increase, and the capacitance value of the capacitance Cx1 is greater than the capacitance value of the capacitance Ca. In embodiments where the constant a is 2, the matching branches corresponding to C1, C2, …, Ca, Cx1, Cx2, …, Cxb may be numbered 20, 21, …, 2a-1, 2a +1, …, 2n-1, in that order.
According to the numbering method of the invention, the combined number can be directly compared with the preset impedance threshold value to determine the impedance of the matching module 130, so that the control flow is simplified, and the matching time of the heating device 100 is further shortened.
According to the formula f 1/(2 pi · sqrt (L · C) for calculating the resonant frequency, when the capacitance C of the cavity capacitor 110 changes due to the different objects 150 to be processed being placed in the same heating apparatus 100 (the inductance L remains constant), the resonant frequency f suitable for the cavity capacitor 110 also changes.
The processing unit 141 may be configured to, after the heating instruction is obtained, control the electromagnetic wave generating 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 generating module 120 in the candidate frequency interval, determine the frequency value of the electromagnetic wave signal that realizes the optimal frequency matching of the cavity capacitor 110, and further determine the capacitance value and the capacitance variation of the cavity capacitor 110 according to the frequency value that realizes the optimal frequency matching, so as to save cost and improve the precision of the capacitance variation of the cavity capacitor 110.
The minimum value of the alternative frequency interval can be 32-38 MHz, and the maximum value can be 42-48 MHz, so that the penetrability of electromagnetic waves is improved, and uniform heating is realized. For example, the candidate frequency ranges are 32 to 48MHz, 35 to 45MHz, 38 to 42MHz, etc.
The processing unit 141 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 in which the optimal frequency matching is achieved to the minimum approximation interval, and further determine the frequency value of the electromagnetic wave signal in which the optimal frequency matching is achieved.
Specifically, the processing unit 141 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 rapidly reduce the range of the interval where the optimal frequency value is located, further rapidly determines the optimal frequency value, shortens the time for determining the capacitance variation of the cavity capacitor 110, and greatly improves 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 20 KHz. The time interval between two adjacent adjusting frequencies of the electromagnetic wave signal may be 10-20 ms, such as 10ms, 15ms, or 20 ms.
In some embodiments, the variable frequency source may be a voltage controlled oscillator, the input voltage of which corresponds to the output frequency. The processing unit 141 may be configured to determine the capacitance value of the cavity capacitance 110 from the input voltage of the voltage controlled oscillator.
In the present invention, the optimal load matching of the electromagnetic wave generation module 120 and the optimal frequency matching of the cavity capacitor 110 mean that the ratio 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 that the impedance value for realizing the optimal load matching or the frequency value for realizing the optimal frequency matching with high accuracy can be obtained while energy is saved.
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 141 may be further configured to obtain 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 after adjusting the impedance value of the matching module 130 or after adjusting the frequency of the electromagnetic wave signal each time, and calculate the 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 load matching degree of the electromagnetic wave generation module 120 or the frequency matching degree of the cavity capacitor 110 is reflected, and the impedance value or the frequency value corresponding to the minimum return loss S11 is the impedance value for achieving the optimal load matching or the frequency value for achieving the optimal frequency 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 or the frequency matching degree of the cavity capacitor 110 is reflected, and the impedance value or the frequency value corresponding to the maximum electromagnetic wave absorption rate is the impedance value for achieving the optimal load matching or 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. 4 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. 4, the control method for the heating apparatus 100 of the present invention may include the steps of:
step S402: the capacitance variation of the cavity capacitance 110 and the weight of the object 150 to be processed are obtained.
Step S404: determining the food material type of the object to be processed according to the capacitance variation of the cavity capacitor 110 and the weight of the object to be processed 150.
According to the control method disclosed by the invention, the food material type of the object to be processed 150 is automatically determined through the capacitance variation of the cavity capacitor 110 after the object to be processed 150 is placed and the weight of the object to be processed 150, so that the use requirement on a user is reduced, and the accuracy of the food material type is improved.
Fig. 5 is a schematic flow chart of obtaining the capacitance variation of the cavity capacitance 110 according to an embodiment of the present invention. Referring to fig. 5, in some embodiments, obtaining the capacitance variation of the cavity capacitance 110 may include the following steps:
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 impedance of the matching module 130 is adjusted and an impedance value of the matching module 130 that achieves optimal load matching of the electromagnetic wave generation module 120 is determined.
Step S506: the capacitance variation of the cavity capacitance 110 is determined according to the impedance value.
In some further embodiments, based on the matching module 130 including a plurality of matching branches that can be independently switched on and off, the step S504 may include the steps of:
acquiring a preset number set;
determining branch numbers of matching branches corresponding to each combination number one by one according to the number sets, controlling the on-off of the corresponding matching branches according to the branch numbers, 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 after the matching branches corresponding to each on-off combination are turned on and off, and calculating a matching degree parameter according to the forward power signal and the reverse power signal;
comparing the matching degree parameters of the on-off combination of the plurality of matching branches;
and determining the on-off combination for realizing the optimal load matching and the impedance value corresponding to the on-off combination according to the comparison result.
In this embodiment, the number set may include a combination number of on-off combinations of the plurality of matching branches, and the combination number corresponds to the impedance value of the matching module 130.
The branch numbers of the multiple matching branches can be sequentially 0 to n-1 power of a constant A, and the combination number can be the sum of the branch numbers of the conducting matching branches in the on-off combination. The constant a may be 2, 3, 4, etc., and n is the number of matching branches.
The forward power signal and the reverse power signal may be measured by a bi-directional coupler. The matching parameter may be return loss or electromagnetic wave absorption. Specifically, the smaller the return loss value 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 minimum return loss is the impedance value for realizing the optimal load matching; 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 realizing the optimal load matching.
According to the control method, each on-off combination and each matching branch of the matching module 130 are respectively numbered, so that the matching branch corresponding to each on-off combination can be rapidly matched for on-off in the process of determining the impedance value of the matching module 130 for realizing the optimal load matching of the electromagnetic wave generation module 120, the time for determining the capacitance variation of the cavity capacitor 110 is further shortened, and the user experience is greatly improved.
Fig. 6 is a schematic flow chart of obtaining the capacitance variation of the cavity capacitance 110 according to another embodiment of the present invention. Referring to fig. 6, in other embodiments, obtaining the capacitance variation of the cavity capacitance 110 may include the following steps:
step S602: the electromagnetic wave generation module 120 is controlled to generate an electromagnetic wave signal with a preset initial power. The preset initial power can be 10-20W, such as 10W, 15W or 20W, so that the frequency value for realizing the optimal frequency matching with high accuracy is obtained while energy is saved.
Step S604: 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 that the penetrability of electromagnetic waves is improved, and uniform heating is realized. For example, the candidate frequency ranges are 32 to 48MHz, 35 to 45MHz, 38 to 42MHz, etc.
Step S606: the capacitance variation of the cavity capacitance 110 is determined according to the frequency value.
In some further embodiments, step S604 may 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. The method specifically comprises the following steps:
and acquiring an initial frequency approximation interval. Wherein, the initial frequency approximation interval may be the aforementioned alternative frequency interval.
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, after adjusting the frequency of the electromagnetic wave signal 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, and calculating a matching degree parameter of the frequency according to the forward power signal and the reverse power signal. 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 comparing the matching degree parameters of the frequencies until the frequency approximation interval is the minimum approximation interval. 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 of 0.2-20 KHz, such as 0.2KHz, 1KHz, 5KHz, 10KHz, or 20 KHz.
And determining the frequency value of the electromagnetic wave signal realizing the optimal frequency matching according to the comparison result.
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 capacitance of the cavity capacitor 110 and greatly improve the user experience.
In some embodiments, after step S404, the method may further include:
determining the heating power of the electromagnetic wave signal for heating the object to be processed 150 according to the food material type; and/or
The heating time of the object 150 to be processed is determined according to the kind and weight of the food material.
The heating power may be substantially in positive correlation with the ratio of the capacitance variation to the weight, i.e., the larger the ratio of the capacitance variation to the weight is, the higher the corresponding heating power is, so as to reduce the local overheating of the object 150 to be processed.
Heating time can be roughly in positive correlation with the ratio of weight, capacitance variation and weight, and that is to say that the weight is bigger, and corresponding heating power is higher, and the ratio of capacitance variation and weight is bigger, and corresponding heating power is higher to avoid eating material local overheat, electromagnetic wave generation module 120's power amplifier to generate heat too much, influence safety.
Fig. 7 is a detailed flowchart of a control method for the heating apparatus 100 according to an embodiment of the present invention. Referring to fig. 7, the control method for the heating apparatus 100 according to the present invention may include the following detailed steps:
step S702: it is determined whether the boat 160 is moved. If yes, go to step S704; if not, the step S702 is repeated to save energy.
Step S704: and acquiring a heating instruction.
Step S706: in the case where the heating instruction is acquired, the weight of the object to be processed 150 is acquired. In this step, the weight may be measured by a load cell.
Step S708: the electromagnetic wave generation module 120 is controlled to generate an electromagnetic wave signal with a preset initial power.
Step S710: a pre-configured number set is obtained.
Step S712: and determining the branch numbers of the matching branches corresponding to each combination number one by one according to the number sets, controlling the on-off of the corresponding matching branches according to the branch numbers, acquiring a forward power signal output by the electromagnetic generation module and a reverse power signal returned to the electromagnetic wave generation module 120 after the matching branches corresponding to each on-off combination are turned on and off, and calculating a matching degree parameter according to the forward power signal and the reverse power signal.
Step S714: and comparing the matching degree parameters of the on-off combination of the plurality of matching branches.
Step S716: and determining the on-off combination for realizing the optimal load matching and the impedance value corresponding to the on-off combination according to the comparison result.
Step S718: the capacitance variation of the cavity capacitance 110 is determined according to the impedance value.
Step S720: and determining the heating power and the heating time of the electromagnetic wave signal according to the capacitance variation and the weight.
Step S722: the electromagnetic wave signal for controlling the electromagnetic wave generation module 120 to generate the heating power.
Step S724: it is determined whether the electromagnetic wave generation module 120 operates for a heating time or more. If yes, go to step S726; if not, the process returns to step S722.
Step S726: the electromagnetic wave generation module 120 is controlled to stop operating. Returning to step S702, the next cycle is started.
The heating device 100 and the control method are particularly suitable for unfreezing food, and particularly for unfreezing food to-4-0 ℃.
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 (10)
1. 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, wherein the control method comprises:
acquiring the capacitance variation of the cavity capacitance and the weight of the object to be processed;
and determining the food material type of the object to be processed according to the capacitance variation and the weight.
2. The control method according to claim 1, further comprising:
determining the heating power of the electromagnetic wave signal for heating the object to be processed according to the food material type; and/or
And determining the heating time for heating the object to be treated according to the food material type and the weight.
3. The control method according to claim 1, wherein the heating apparatus further comprises a matching module for adjusting a load impedance of the electromagnetic wave generation module by adjusting a self impedance, and wherein the step of obtaining a capacitance change amount of the cavity capacitance comprises:
controlling the electromagnetic wave generation module to generate an electromagnetic wave signal with preset initial power;
adjusting the impedance of the matching module and determining the impedance value of the matching module for realizing the optimal load matching of the electromagnetic wave generation module;
and determining the capacitance variation according to the impedance value.
4. The control method according to claim 3, the matching module comprising a plurality of matching branches that can be independently switched on and off, wherein the step of adjusting the impedance of the matching module and determining the impedance value of the matching module that achieves optimal load matching of the electromagnetic wave generation module comprises:
traversing the on-off combinations of the plurality of matching branches, and acquiring a matching degree parameter corresponding to each on-off combination and reflecting the load matching degree of the electromagnetic wave generation module;
comparing the matching degree parameters of the on-off combination of the plurality of matching branches;
and determining the on-off combination for realizing the optimal load matching and the impedance value corresponding to the on-off combination according to the comparison result.
5. The control method according to claim 4, wherein the step of traversing the on-off combinations of the plurality of matching branches and obtaining the matching degree parameter corresponding to each on-off combination and reflecting the load matching degree of the electromagnetic wave generation module includes:
acquiring a preset number set, wherein the number set comprises a combined number of on-off combination of the plurality of matching branches, and the combined number corresponds to the impedance value;
and determining the branch serial numbers of the matched branches corresponding to each combination serial number one by one according to the serial number set, and controlling the on-off of the corresponding matched branches according to the branch serial numbers.
6. The control method according to claim 1, wherein the step of obtaining the capacitance change amount of the cavity capacitance 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 capacitance variation according to the frequency value.
7. The control method according to claim 6, 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 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.
8. The control method according to claim 3 or 6, further comprising:
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 determining the optimal impedance matching or the most frequency matching according to the forward power signal and the reverse power signal.
9. The control method according to claim 1, wherein the heating device further comprises a boat for carrying the object to be processed, and the boat is movable to take and place the object to be processed, the control method further comprising:
after the object bearing vessel is detected to move, acquiring a heating instruction;
and if the heating instruction is acquired, executing the step of acquiring the capacitance variation of the cavity capacitance and the weight of the object to be processed.
10. 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 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010011074.0A CN113079603B (en) | 2020-01-06 | 2020-01-06 | Control method for heating device and heating device |
| PCT/CN2020/125510 WO2021139363A1 (en) | 2020-01-06 | 2020-10-30 | Control method for heating device, and heating device |
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| CN202010011074.0A CN113079603B (en) | 2020-01-06 | 2020-01-06 | Control method for heating device and heating device |
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| WO2021139363A1 (en) | 2021-07-15 |
| CN113079603B (en) | 2022-07-26 |
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