Control method and device of radio frequency thawing equipment, equipment and storage medium

Abstract

This application discloses a control method, apparatus, device, and storage medium for an RF defrosting device. The RF defrosting device includes an RF power amplification circuit for outputting RF power to a tuning circuit and a tuning circuit for impedance matching. The method includes: identifying food in the RF defrosting device to obtain food information; determining the target RF power and initial defrosting time of the RF defrosting device based on the food information; adjusting the initial defrosting time according to the mismatch frequency or reflection coefficient of the tuning circuit to obtain the target defrosting time. The mismatch frequency is used to characterize the frequency at which the tuning circuit is triggered for impedance matching, and the reflection coefficient is used to characterize the power consumption of the RF power amplification circuit; and defrosting the food according to the target RF power and target defrosting time. The technical solution of this application can actively identify food and continuously adjust the defrosting time during the defrosting process, effectively realizing intelligent defrosting.

Description

Technical Field

[0001] This application belongs to the field of radio frequency defrosting control technology, and particularly relates to a control method, device, equipment and storage medium for radio frequency defrosting equipment. Background Technology

[0002] Compared to traditional natural or microwave thawing, radio frequency (RF) defrosting equipment offers advantages such as faster defrosting speed, more uniform defrosting effect, and greater ease and hygiene of use.

[0003] The defrosting effect of radio frequency defrosting equipment largely depends on the control system's understanding of the food, such as its type, quality, and initial temperature. Therefore, users typically need to manually input the specific information about the food and the defrosting time, and the control system then defrosts according to this information. This approach requires manual user intervention and has a low level of automation. Summary of the Invention

[0004] The embodiments of this application provide a control method, apparatus, device, and storage medium for a radio frequency defrosting device, thereby avoiding manual intervention and improving the intelligence level of defrosting.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part by practice of this application.

[0006] According to a first aspect of the embodiments of this application, a control method for a radio frequency (RF) defrosting device is provided. The RF defrosting device includes an RF power amplification circuit and a tuning circuit. The RF power amplification circuit is used to output RF power to the tuning circuit, and the tuning circuit is used for impedance matching. The method includes:

[0007] The food ingredients in the radio frequency defrosting device are identified to obtain food information;

[0008] Based on the food information, determine the target radio frequency power and initial defrosting time of the radio frequency defrosting device;

[0009] The initial defrosting time is adjusted according to the mismatch frequency or reflection coefficient of the tuning circuit to obtain the target defrosting time. The mismatch frequency is used to characterize the frequency at which the tuning circuit is triggered for impedance matching, and the reflection coefficient is used to characterize the power consumption of the RF power amplifier circuit.

[0010] The food is thawed according to the target radio frequency power and the target thawing time.

[0011] In some embodiments of this application, based on the foregoing scheme, the step of identifying the food ingredients in the radio frequency defrosting device to obtain food ingredient information includes:

[0012] The radio frequency defrosting device is controlled to defrost the food according to a preset radio frequency power and a preset defrosting time, so as to determine the response data of the tuning circuit for impedance matching within the preset defrosting time.

[0013] The ingredient information is determined based on the response data and multiple pre-constructed sets of sample data.

[0014] In some embodiments of this application, based on the foregoing scheme, the preset radio frequency power is greater than the target radio frequency power.

[0015] In some embodiments of this application, based on the foregoing scheme, the sample data includes sample response data and sample feature parameters corresponding one-to-one with the sample response data. The feature parameters are used to characterize the attribute state of the food ingredient. Determining the food ingredient information based on the response data and multiple pre-constructed sets of sample data includes:

[0016] The response data of the tuning circuit under impedance matching during multiple preset thawing times are determined to obtain multiple sets of response data;

[0017] For each set of target response data, the matching degree between the target response data and each set of sample response data is determined. The matching degree is used to characterize the closeness between the target response data and the sample response data. The target response data is any one of the multiple sets of response data.

[0018] Based on the matching degree between the multiple sets of response data and the same sample response data, calculate the comprehensive matching degree between the multiple sets of response data and the same sample response data;

[0019] The sample feature parameters corresponding to the sample response data with the highest overall matching degree are determined as the food information.

[0020] In some embodiments of this application, based on the foregoing scheme, calculating the comprehensive matching degree between the multiple sets of response data and the same sample response data based on the matching degree between the multiple sets of response data and the same sample response data includes:

[0021] The matching degree of each group of response data to the same sample response data is weighted and calculated to obtain the comprehensive matching degree of multiple groups of response data with the same sample response data.

[0022] In some embodiments of this application, based on the foregoing scheme, the tuning circuit includes energy storage element groups connected in series and parallel, wherein each energy storage element group has multiple state values, the state values ​​being used to characterize the access state of each energy storage element in the energy storage element group, and the method further includes:

[0023] Determine if the impedance matching command has been triggered for the first time;

[0024] If the impedance matching command is not triggered for the first time, the reference state value coordinates are obtained based on the state values ​​of each energy storage element group when the impedance matching was completed last time.

[0025] The target state value coordinates are matched from a first coordinate region that is close to the reference state value coordinates to complete the new impedance matching.

[0026] In some embodiments of this application, based on the foregoing scheme, after determining whether the impedance matching command is triggered for the first time, the method further includes:

[0027] If the impedance matching command is triggered for the first time, a target energy storage element group is determined in the energy storage element group;

[0028] When all energy storage elements in the target energy storage element group are not connected, the reflection coefficient of each state value of other energy storage element groups in the tuning circuit is traversed, and the state value with the smallest reflection coefficient is taken as the first state value. The other energy storage element groups are the energy storage element groups other than the target energy storage element group.

[0029] When all the energy storage elements in the target energy storage element group are connected, the reflection coefficient of each state value of the other energy storage element groups in the tuning circuit is traversed, and the state value with the smallest reflection coefficient is taken as the second state value.

[0030] Match the target state value coordinates from the second coordinate region defined by the first state value and the second state value to complete the impedance matching when the impedance matching command is first triggered.

[0031] In some embodiments of this application, based on the foregoing scheme, the initial thawing time is adjusted according to the mismatch frequency of the tuning circuit to obtain the target thawing time, including:

[0032] The mismatch frequency of the tuning circuit at the beginning of the initial thawing time is taken as the initial mismatch frequency.

[0033] The mismatch frequency of the tuning circuit when the food undergoes a phase change is used as the reference mismatch frequency, and the actual time consumed by the tuning circuit to change from the initial mismatch frequency to the reference mismatch frequency is obtained.

[0034] Based on the initial mismatch frequency and the reference mismatch frequency, as well as the actual time consumed, the theoretical thawing time required for the radio frequency thawing device to thaw the food is determined;

[0035] The difference between the initial thawing time and the actual consumption time is determined as the initial remaining thawing time, and the difference between the theoretical thawing time and the actual consumption time is determined as the theoretical remaining thawing time.

[0036] If the theoretical remaining thawing time and the initial remaining thawing time are not approximately equal, the theoretical remaining thawing time is determined as the target thawing time.

[0037] In some embodiments of this application, based on the foregoing scheme, the initial thawing time is adjusted according to the reflection coefficient of the tuning circuit to obtain the target thawing time, including:

[0038] During the defrosting process of the food in the radio frequency defrosting device, it is determined whether the reflection coefficient undergoes a sudden change;

[0039] If the reflection coefficient changes abruptly, the actual time consumed by the radio frequency defrosting device from the start of defrosting to the change in the reflection coefficient is obtained, the initial mismatch frequency of the tuning circuit at the beginning of the initial defrosting time, and the reference mismatch frequency of the tuning circuit when the reflection coefficient changes abruptly.

[0040] Based on the initial mismatch frequency and the reference mismatch frequency, as well as the actual time consumed, the theoretical thawing time required for the radio frequency thawing device to thaw the food is determined;

[0041] The difference between the initial thawing time and the actual consumption time is determined as the initial remaining thawing time, and the difference between the theoretical thawing time and the actual consumption time is determined as the theoretical remaining thawing time.

[0042] If the theoretical remaining thawing time and the initial remaining thawing time are not approximately equal, the theoretical remaining thawing time is determined as the target thawing time.

[0043] In some embodiments of this application, based on the foregoing scheme, the radio frequency defrosting device includes a defrosting chamber, and the method further includes:

[0044] During the defrosting process of the food in the radio frequency defrosting device, the drawer status of the defrosting chamber is obtained;

[0045] With the drawer in an open state, the target RF power is set to zero.

[0046] In some embodiments of this application, based on the foregoing scheme, the method further includes:

[0047] During the defrosting process of the food in the radio frequency defrosting device, it is determined whether the radio frequency defrosting device needs to be repeated based on whether the reflection coefficient changes abruptly at the initial defrosting time.

[0048] According to a second aspect of the present application, a control device for a radio frequency (RF) defrosting device is provided. The RF defrosting device includes an RF power amplification circuit and a tuning circuit. The RF power amplification circuit is used to output RF power to the tuning circuit, and the tuning circuit is used for impedance matching. The device includes:

[0049] The food identification unit is used to identify the food in the radio frequency defrosting device and obtain food information;

[0050] A matching control unit is used to determine the target radio frequency power and initial defrosting time of the radio frequency defrosting device based on the food information.

[0051] The time adjustment unit is used to adjust the initial defrosting time according to the mismatch frequency or reflection coefficient of the tuning circuit to obtain the target defrosting time. The mismatch frequency is used to characterize the frequency at which the tuning circuit is triggered to perform impedance matching, and the reflection coefficient is used to characterize the power consumption of the RF power amplifier circuit.

[0052] A defrosting control unit is used to defrost the food according to the target radio frequency power and the target defrosting time.

[0053] According to a third aspect of the present application, a control device for a radio frequency defrosting device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method described above.

[0054] According to a fourth aspect of the embodiments of this application, a computer-readable storage medium is provided, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the steps of the method described above.

[0055] In this application, the radio frequency (RF) defrosting device includes an RF power amplification circuit for outputting RF power to a tuning circuit and a tuning circuit for impedance matching. The method includes: identifying the food in the RF defrosting device to obtain food information; determining the target RF power and initial defrosting time of the RF defrosting device based on the food information; adjusting the initial defrosting time according to the mismatch frequency or reflection coefficient of the tuning circuit to obtain the target defrosting time, where the mismatch frequency characterizes the frequency at which the tuning circuit is triggered for impedance matching, and the reflection coefficient characterizes the power consumption of the RF power amplification circuit; and defrosting the food according to the target RF power and target defrosting time. The technical solution of this application can actively identify the food and continuously adjust the defrosting time during the defrosting process, avoiding manual input of food information and defrosting time, and effectively realizing the intelligent defrosting process.

[0056] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0057] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0058] Figure 1 A schematic diagram of a radio frequency defrosting device according to an embodiment of this application is shown;

[0059] Figure 2 A flowchart is shown of a control method for a radio frequency defrosting device according to an embodiment of this application;

[0060] Figure 3 A detailed flowchart of step 201 according to one embodiment of this application is shown;

[0061] Figure 4 A schematic diagram showing the temperature changes in different parts of the food during the thawing process is provided.

[0062] Figure 5 A circuit diagram of a tuning circuit according to an embodiment of this application is shown;

[0063] Figure 6 This diagram illustrates the changing trend of the access state of an energy storage element group according to an embodiment of this application.

[0064] Figure 7 A flowchart illustrating impedance matching of a tuning circuit according to an embodiment of this application is shown;

[0065] Figure 8 A detailed flowchart of step 203 according to one embodiment of this application is shown;

[0066] Figure 9 A graph showing the variation of mismatch frequency according to an embodiment of this application is shown;

[0067] Figure 10 A detailed flowchart of step 203 according to another embodiment of this application is shown;

[0068] Figure 11 A schematic diagram showing the variation trend of the reflectance coefficient according to an embodiment of this application is shown;

[0069] Figure 12A block diagram of the control device of a radio frequency defrosting apparatus according to an embodiment of the present application is shown;

[0070] Figure 13 An internal structural diagram of the control device of a radio frequency defrosting apparatus according to an embodiment of this application is shown. Detailed Implementation

[0071] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0072] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0073] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0074] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0075] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0076] It should be noted that the radio frequency defrosting device proposed in this application includes a radio frequency power amplification circuit and a tuning circuit. The radio frequency power amplification circuit is used to output radio frequency power to the tuning circuit, and the tuning circuit is used for impedance matching.

[0077] It should also be noted that the radio frequency defrosting device proposed in this application refers to a device with radio frequency defrosting function, such as a refrigerator with radio frequency defrosting function. It is understood that, correspondingly, the control method of the radio frequency defrosting device proposed in this application can be applied to all devices with radio frequency defrosting function, including but not limited to refrigerators.

[0078] To enable those skilled in the art to better understand the radio frequency defrosting device of this application, the following will be combined with Figure 1 Please provide an explanation.

[0079] Figure 1 A schematic diagram of a radio frequency defrosting device according to an embodiment of this application is shown.

[0080] like Figure 1 The image shows a possible radio frequency (RF) defrosting device, which includes a hardware system and a control system. The hardware system includes an adjustable power supply for powering the entire RF defrosting device and enabling output voltage regulation; an RF power amplification circuit for outputting RF power to the tuning circuit and providing RF defrosting energy to the food during the defrosting process; a tuning circuit for compensating for load impedance mismatch caused by changes in the food's state; and a food and cavity for containing the food to be defrosted.

[0081] like Figure 1 The control system of the radio frequency defrosting device shown includes: power closed-loop control, which samples the forward and reverse power signals and outputs control signals to the adjustable power supply and radio frequency power amplification circuit to achieve precise output power closed-loop control; automatic matching control, which automatically acquires the forward and reverse power signals to automatically send impedance matching commands to the tuning circuit when impedance mismatch occurs; defrosting process control, which controls the output power curve and output time according to the needs of food identification and the defrosting process; and food identification, which judges and identifies the type of food and determines food information (such as type, quality, temperature, etc.).

[0082] Figure 2 A flowchart of a control method for a radio frequency defrosting device according to an embodiment of this application is shown.

[0083] like Figure 2 As shown, a control method for a radio frequency defrosting device is provided, which is applied to... Figure 1 Taking a radio frequency defrosting device as an example, the method may include the following steps:

[0084] Step 201: Identify the food ingredients in the radio frequency defrosting device to obtain food ingredient information.

[0085] It should be understood that different ingredients possess different properties and states. For example, different ingredients to be thawed have different ingredient types, pressures when placed in the ingredient container, mass, initial thawing temperature, volume, shape, image, and moisture content, etc. In this embodiment, the specific properties and states of the ingredients can be determined as ingredient information according to different application scenarios, and this application does not limit this.

[0086] Specifically, the control device of the radio frequency defrosting equipment can identify food in various ways. In one example, a weight sensor, temperature sensor, or vision sensor can be set in the control device, and the food can be identified based on the signals uploaded by the weight sensor, temperature sensor, or vision sensor. In another example, the food can be defrosted at a fixed radio frequency power and a fixed defrosting time, and the response data of the tuning circuit for impedance matching within the preset defrosting time can be obtained. The food information can then be determined based on the response data.

[0087] Step 202: Determine the target radio frequency power and initial defrosting time of the radio frequency defrosting device based on the food information.

[0088] It should be understood that the principle of radio frequency defrosting is that under the influence of an alternating radio frequency electric field, the polar molecules in the food continuously rotate and collide, increasing the internal energy of the food. The main difference between foods lies in their dielectric constants. The dielectric properties of a food determine the interaction between the food and electromagnetic energy, and are described by its dielectric constant and dielectric loss. The dielectric constant reflects the food's ability to store energy in an electromagnetic field, while the dielectric loss reflects its ability to convert electromagnetic energy into heat energy. Foods with higher dielectric loss absorb electric field energy more easily than those with lower dielectric loss. Factors that typically affect the dielectric constant of food include: water content, temperature, and weight.

[0089] Moisture in food can exist in the form of free water or bound water, with free water contributing far more to the dielectric constant than bound water. Compared to food with low moisture content, food with high moisture content has a higher dielectric constant and dielectric loss. Therefore, when food with high moisture content is placed in a thawing chamber, its optimal impedance matching point will be significantly different from that of food with low moisture content, and it will require more energy to thaw to the same temperature.

[0090] The effect of food temperature on dielectric properties depends on the radio frequency (RF) frequency, the ratio of free water to bound water, ionic conductivity, and material composition. At RF frequencies, due to the polarization of bound water, both the dielectric constant and dielectric loss of the food increase with increasing temperature. The dielectric constant and dielectric loss of free water decrease with increasing temperature; therefore, the temperature-dependent dielectric properties of food are related to the ratio of free water to bound water. The dielectric properties of food exhibit different trends at different temperature ranges, but overall, the dielectric constant and dielectric loss increase significantly when food is thawed, especially between -5℃ and 0℃.

[0091] The greater the mass of a food ingredient, the more ice it contains melts into freely moving polarized water molecules. Therefore, under the same food type and temperature conditions, a heavier food ingredient can absorb more energy and its temperature rises more slowly when thawed to the same temperature point than a lighter food ingredient.

[0092] In other words, for ingredients of the same temperature and mass, the lower the water content, the less energy is required for thawing; for ingredients of the same temperature and water content, the smaller the mass, the less energy is required for thawing; and for ingredients of the same water content and mass, the lower the temperature, the smaller the free-floating polar water molecules, and the more energy is required for thawing. Therefore, the target radio frequency power and initial thawing time of the radio frequency defrosting equipment will differ depending on the specific ingredients.

[0093] Specifically, predetermined calibration data can be obtained. The calibration data is used to characterize the correspondence between radio frequency power and defrosting time and food information. Based on the calibration data and the food information, the target radio frequency power and initial defrosting time are matched for the food in the radio frequency defrosting device.

[0094] The target radio frequency (RF) power can be a fixed value, a variable RF power, or other methods, and this application does not limit this. It is understood that using a variable RF power as the target RF power allows the food to absorb different RF power at different thawing stages. This not only avoids wasting RF energy but also improves the accuracy of the thawing program matched to the food by the RF thawing equipment.

[0095] In this embodiment, by matching appropriate target radio frequency power and initial defrosting time to different ingredients (different types of ingredients, different qualities of ingredients, different temperatures of ingredients, etc.), the accuracy of radio frequency defrosting equipment in defrosting ingredients can be improved, thus enhancing the user experience.

[0096] Step 203: Adjust the initial defrosting time according to the mismatch frequency or reflection coefficient of the tuning circuit to obtain the target defrosting time. The mismatch frequency is used to characterize the frequency at which the tuning circuit is triggered for impedance matching, and the reflection coefficient is used to characterize the power consumption of the RF power amplifier circuit.

[0097] The mismatch frequency can be interpreted as the number of times impedance mismatch occurs in the tuning circuit within a fixed time period (i.e., the number of times impedance matching is performed). This fixed time period can be 3 minutes, or it can be longer or shorter.

[0098] Specifically, the control equipment of the radio frequency defrosting device can adjust the initial defrosting time according to the mismatch frequency to obtain the target defrosting time, or it can adjust the initial defrosting time according to the reflection coefficient to obtain the target defrosting time.

[0099] It should be understood that the state of food changes continuously during the thawing process. The impedance of the load formed by the food and the thawing chamber also changes in real time. When the load impedance changes significantly, causing the RF power to be unable to output effectively, retuning is required to adapt to the new food state and improve the utilization rate of RF energy. Therefore, during the thawing process, the mismatch frequency and reflection coefficient of the tuning circuit change continuously with the state of the food. By using the mismatch frequency or reflection coefficient of the tuning circuit during the thawing process to correct the initial thawing time and redetermine the thawing time of the food, the accuracy of RF thawing equipment in thawing food can be effectively improved.

[0100] Step 204: Thaw the food according to the target radio frequency power and the target thawing time.

[0101] It should be understood that, because the food is identified in the early stages of the defrosting process, and a corresponding target radio frequency power and initial defrosting time are matched for different foods, and the initial defrosting time is corrected based on the mismatch frequency or reflection coefficient of the tuning circuit during the defrosting process, compared with applying a fixed radio frequency power to different foods, using the same defrosting time, or using a user-set defrosting time, the technical solution proposed in this application can more accurately provide a matching defrosting solution for different foods. That is, the radio frequency defrosting device can strictly control the defrosting time of the food and the radio frequency power required for the defrosting process, thereby enabling the food to be defrosted accurately.

[0102] This embodiment identifies the food in the radio frequency (RF) defrosting device to obtain food information; based on the food information, it determines the target RF power and initial defrosting time of the RF defrosting device; based on the mismatch frequency or reflection coefficient of the tuning circuit, it adjusts the initial defrosting time to obtain the target defrosting time. The mismatch frequency characterizes the frequency with which the tuning circuit is triggered for impedance matching, and the reflection coefficient characterizes the power consumption of the RF power amplification circuit; based on the target RF power and target defrosting time, the food is defrosted. The technical solution of this application can actively identify the food and continuously adjust the defrosting time during the defrosting process, avoiding manual input of food information and defrosting time, effectively realizing intelligent defrosting.

[0103] Figure 3 A detailed flowchart of step 201 according to one embodiment of this application is shown.

[0104] like Figure 3 As shown, determining the target radio frequency power and initial defrosting time for the radio frequency defrosting device based on the food information may include the following steps:

[0105] Step 301: Control the radio frequency defrosting device to defrost the food according to the preset radio frequency power and preset defrosting time, so as to determine the response data of the tuning circuit for impedance matching within the preset defrosting time.

[0106] Step 302: Determine the ingredient information based on the response data and multiple pre-constructed sets of sample data.

[0107] Among them, the preset radio frequency power and preset thawing time are specific radio frequency power applied to the food to be thawed at a certain time during the initial thawing stage in order to determine the food information.

[0108] In practice, the preset RF power can be greater than the target RF power. Because the dielectric constant and dielectric loss of food increase with temperature at a certain frequency, the food absorbs more electromagnetic energy as the temperature rises. Food at higher temperatures absorbs more energy more easily, thus causing a "thermal runaway" effect in the later stages of thawing. As for the food in the RF electric field, the electromagnetic waves penetrate into the food's interior perpendicular to its surface, and attenuate continuously during penetration. The electric field strength at the edges and corners of the food is significantly higher than in other areas, making these areas easier to heat. Furthermore, as thawing time increases, the temperature of the overheated areas increases more than other parts. Additionally, during thawing, the crystalline ice at the top of the food melts and accumulates at the bottom, resulting in a higher water content at the bottom than at the top. Under the influence of the electric field, the difference in dielectric properties between the top and bottom of the food also increases, meaning the bottom absorbs more heat than the top, gradually widening the temperature difference.

[0109] Figure 4 This diagram illustrates the temperature changes in different parts of the food during the thawing process, such as... Figure 4 As shown, curve 1 represents the edges, corners, or bottom of the food, where heat is more easily absorbed. Curve 2 represents the parts with a relatively high specific heat capacity, such as the middle part of the food. I0 represents the first stage of food identification, I1 represents the second stage of food identification, and P0 represents the thawing stage.

[0110] To prevent thermal runaway, during the identification phases I0 and I1 of the thawing process, the food is at a relatively low temperature, with most of the water still existing as ice and having a small specific heat capacity. The temperature difference between curves 1 and 2 is small, so the radio frequency power (i.e., the preset radio frequency power) can be set relatively high. After the identification phase, the food is in a semi-thawed state. If thawing continues at a high power at this point, the temperature difference between different parts of the food will increase, exacerbating thermal runaway. Therefore, during the thawing phase P0, a lower thawing power (i.e., the target radio frequency power) needs to be set to allow the temperature from the high-temperature area to be transferred to the low-temperature area, preventing thermal runaway.

[0111] The response data refers to the state data that occurs during impedance matching of the tuning circuit in the RF defrosting device within a certain preset defrosting time. For example, it could be the number of impedance matching operations within the preset defrosting time (i.e., the number of mismatches in the tuning circuit); it could be the connection status of the energy storage element after the preset defrosting time begins; it could be the trend of power output of the RF power amplifier circuit during impedance matching of the tuning circuit within the preset defrosting time; or it could be the trend of reflection coefficient changes during the preset defrosting time. Specifically, this application does not limit which type of state data occurring during impedance matching of the tuning circuit is used as the response data.

[0112] To enable those skilled in the art to better understand the response data of this embodiment, the following will be combined with Figure 5 Please provide an explanation.

[0113] See Figure 5 The diagram shows a circuit diagram of a tuning circuit according to an embodiment of this application.

[0114] like Figure 5 The diagram illustrates a possible tuning matching loop circuit, which includes energy storage element groups (e.g., energy storage element group 1 connected in series with load 4, and energy storage element group 2 connected in parallel with load 4), inductor 3, and load 4 for impedance matching. In a specific implementation, the number of energy storage element groups 1 and 2 can both be one or more. Each energy storage element group can include energy storage elements and actuating elements. The connection of the corresponding energy storage element is achieved by opening and closing the actuating elements, thereby realizing impedance matching.

[0115] In some implementations, when the impedance of load 4 changes (i.e., when the state of the food changes during the thawing process), an impedance mismatch occurs in the tuning circuit. In this case, it can be resolved by adjusting, for example... Figure 4 The opening and closing states of each operable element shown are used for impedance matching, that is, adjusting the connection state of different energy storage elements in energy storage element group 1 and / or energy storage element group 2 to compensate for impedance mismatch, so that the RF power output by the RF amplifier circuit can be maximized.

[0116] It is understandable that, corresponding to Figure 5 The tuning circuit shown will inevitably generate many different response data during the impedance matching process, such as the connection status of the energy storage element group, the number of impedance matching events, etc.

[0117] Among them, the pre-constructed multiple sets of sample data refer to the experimental data made by relevant personnel to more accurately realize the defrosting function of the radio frequency defrosting equipment. These include sample response data and sample feature parameters that correspond one-to-one with the sample response data. The feature parameters are used to characterize the property state of the food.

[0118] As can be understood, sample response data refers to the response data of the tuned circuit under impedance matching within a certain experimental time, obtained from experiments conducted on a large number of different ingredients (including different ingredients constructed with variations in variety, temperature, quality, etc.) at a certain experimental RF power and for a certain experimental time. The sample characteristic parameters corresponding one-to-one with the sample response data can be sample characteristic parameters such as ingredient type, ingredient temperature, and ingredient quality.

[0119] For example, using meat, 500g weight, and -10℃ as sample characteristic parameters, the corresponding sample response data for these sample characteristic parameters can be that the number of mismatches in the tuning circuit is 20.

[0120] In some implementations, determining ingredient information based on response data and pre-constructed sets of sample data can be achieved through the following steps:

[0121] The response data of the tuning circuit under impedance matching within multiple preset thawing times are determined, resulting in multiple sets of response data. For each set of target response data, the matching degree between the target response data and each set of sample response data is determined. The matching degree is used to characterize the closeness between the target response data and the sample response data. The target response data is any one of the multiple sets of response data. Based on the matching degree between the multiple sets of response data and the same sample response data, the comprehensive matching degree between the multiple sets of response data and the same sample response data is calculated. The sample feature parameters corresponding to the sample response data with the highest comprehensive matching degree are determined as the food information.

[0122] It should be noted that multiple preset defrosting times will correspond to multiple preset radio frequency (RF) powers applied to the food. However, the preset RF power and preset defrosting time can be the same or different each time. Specifically, this application does not impose any restrictions.

[0123] Multiple sets of response data can be obtained from multiple thawing tests or from a single thawing test. For example, the number of mismatches in the tuning circuit can be used as response data. If two thawing tests are performed on the food at the beginning of the thawing process, two sets of data on the number of mismatches in the tuning circuit will be generated.

[0124] The matching degree between the target response data and the sample response data of each group can be the ratio or difference between the target response data and the sample response data. Alternatively, the method for determining the matching degree between the target response data and the sample response data of each group can be set according to different application scenarios. In this application, no specific limitation is made.

[0125] If there are multiple sets of response data, each set of response data will be matched with each type of sample response data to obtain a matching degree. In this way, the same sample response data may correspond to multiple matching degrees.

[0126] In some implementations, the matching degree of each group of response data corresponding to the same sample response data can be weighted and calculated to obtain the comprehensive matching degree of multiple groups of response data with the same sample response data. After determining the comprehensive matching degree, a comprehensive matching degree threshold can be set, and the sample feature parameters corresponding to the sample response data with a comprehensive matching degree exceeding the comprehensive matching degree threshold can be determined as food information.

[0127] To enable those skilled in the art to better understand the process of determining ingredient information, the following explanation will be provided in conjunction with Tables 1 to 3.

[0128] Response data Sample 1 Sample 2 First group test Second group test Third group test Number of mismatches 20 times 25 times 10 times 15 times 18 times

[0129] Table 1

[0130] First group test Second group test Third group test Matching degree with sample 1 50％ 75％ 90％ Matching degree with sample 2 40％ 60％ 72％

[0131] Table 2

[0132] Overall matching degree with sample 1 74.5％ Overall matching degree with sample 2 59.6％

[0133] Table 3

[0134] In one example, as shown in Table 1, the data represents the response data of the tuning circuit under impedance matching during three preset thawing times (i.e., three sets of response data were obtained), including two sets of sample response data. The response data is based on the number of mismatches in the tuning circuit. Table 1 shows that the target response data for the first test set is 10 times, the target response data for the second test set is 15 times, the target response data for the third test set is 18 times, the sample response data for sample 1 is 20 times (sample 1 response data), and the response data for sample 2 is 25 times (sample 1 response data).

[0135] Table 2 determines the matching degree between the response data and the sample response data using the ratio of the response data to the sample response data. Table 3 determines the overall matching degree using a weighted calculation method, assigning weights of 0.2, 0.5, and 0.3 to the three matching degrees respectively. The overall matching degree between the response data and the response data of sample 1 is 74.5%, and the overall matching degree between the response data and the response data of sample 2 is 59.6% calculated in the same way. Because the overall matching degree between the response data and the response data of sample 1 is 74.5%, which is greater than the overall matching degree with the response data of sample 2 (59.6%), the sample feature parameters corresponding to sample 1 can be identified as food information. For example, if the sample feature parameters corresponding to sample 1 are meat, 500g weight, and -10℃, then these parameters are identified as food information.

[0136] In another example, when the response data includes both the access status of the energy storage element group after the preset thawing time begins in the tuned circuit and the number of mismatches, the first score corresponding to the access status can be calculated by the difference between the access status of the energy storage element group in the tuned circuit and the access status in the sample response data, and the first score is used as the first matching degree; then, the second score corresponding to the number of mismatches is calculated by the difference between the number of mismatches in the tuned circuit and the number of mismatches in the sample response data, and the second score is used as the second matching degree; finally, different weights are assigned to the first matching degree and the second matching degree to obtain the comprehensive matching degree.

[0137] Throughout the thawing process, the connection status of energy storage element groups connected in series with the load and the connection status of energy storage element groups connected in parallel with the load show different trends. The former exhibits greater randomness and uncertainty in the early and later stages of thawing compared to the latter. Figure 6This diagram illustrates the changing trend of the access state of an energy storage element group according to an embodiment of this application. The access state (i.e., Y value) of the energy storage element group connected in parallel with the load typically decreases first, then increases, or remains unchanged. Different foods exhibit significantly different patterns, specifically due to differences in their water content. When the food absorbs the same amount of energy, the amount of water melted from ice in free water varies, thus requiring different Y values ​​for matching and compensation. The differences in different foods result in different curves for the Y value changing with temperature. Based on this characteristic, when the response data includes the access state of the energy storage element group after the tuning circuit begins a preset thawing time, the access state of the energy storage element group can be further divided into the access state of the series-connected energy storage element group and the access state of the parallel-connected energy storage element group. A higher score is assigned to the access state of the parallel-connected energy storage element group when calculating the first score corresponding to the access state.

[0138] This embodiment controls the radio frequency defrosting device to defrost the food according to a preset radio frequency power and a preset defrosting time, so as to determine the response data of the tuning circuit for impedance matching within the preset defrosting time; based on the response data and multiple sets of pre-constructed sample data, the food information is determined, which can improve the accuracy of food identification.

[0139] Figure 7 A flowchart illustrating impedance matching of a tuning circuit according to an embodiment of this application is shown.

[0140] There are many methods for tuning matching in a matching circuit, such as traversal methods and optimization algorithms. To improve matching efficiency, shorten matching time, and reduce the risk of the matching process, a fast matching method can be adopted, which can decompose the matching process into initial matching and process matching.

[0141] like Figure 7 As shown, process matching may include the following steps:

[0142] Step 701: Determine whether the impedance matching command has been triggered for the first time.

[0143] Step 702: If the impedance matching command is not triggered for the first time, obtain the reference state value coordinates based on the state values ​​of each energy storage element group when the impedance matching was completed last time.

[0144] Step 703: Match the target state value coordinates from the first coordinate region that is close to the reference state value coordinates to complete the new impedance matching.

[0145] Each energy storage element group has multiple state values, which are used to characterize the access status of each energy storage element in the energy storage element group.

[0146] It should be understood that since the state of the food does not change drastically in a short period of time, the optimal matching points (the state values ​​of each energy storage element group when impedance matching is completed) will not differ significantly between two consecutive optimal matching points. The previous optimal matching point can be used to define the scanning area. Based on the changing characteristics of the optimal matching point during thawing, when the reference state value is at the bottom of the scanning coordinate system (the scanning coordinate system uses the state values ​​of the energy storage element groups connected in series with the load as the horizontal axis X, and the state values ​​of the energy storage element groups connected in parallel with the load as the vertical axis Y), a first coordinate region close to the reference state value coordinates is defined horizontally; otherwise, the first coordinate region is defined vertically. Then, all combinations of X (state values ​​of the energy storage element groups connected in series with the load) and Y (state values ​​of the energy storage element groups connected in parallel with the load) in the first coordinate region are scanned, and the combination with the minimum reflection coefficient is determined as the target state value coordinate, i.e., the new optimal matching point.

[0147] Initial matching may include the following steps:

[0148] Step 704: If the impedance matching command is triggered for the first time, determine the target energy storage element group in the energy storage element group.

[0149] Step 705: When all energy storage elements in the target energy storage element group are not connected, iterate through the reflection coefficients of each state value of other energy storage element groups in the tuning circuit, and take the state value with the minimum reflection coefficient as the first state value. Other energy storage element groups are energy storage element groups other than the target energy storage element group. The reflection coefficient is used to characterize the power consumption level of the RF power amplifier circuit.

[0150] Step 706: When all the energy storage elements in the target energy storage element group are connected, iterate through the reflection coefficients of each state value in the tuning circuit of other energy storage element groups, and take the state value with the smallest reflection coefficient as the second state value.

[0151] Step 707: Match the target state value coordinates from the second coordinate region defined by the first state value and the second state value to complete the impedance matching when the impedance matching command is first triggered.

[0152] It should be understood that, due to the strong randomness of the initial optimal matching value, it is necessary to longitudinally search for the reflection coefficients corresponding to various state values ​​(e.g., Y = 0 to 31) of other energy storage element groups when all energy storage elements in the target energy storage element group are not connected (e.g., X = 0), and record the state value Y1 corresponding to the minimum reflection coefficient. To simplify the search process, in actual implementation, a binary search method or other optimization algorithm can be used to quickly find the minimum reflection coefficient. Following the same method, when all energy storage elements in the target energy storage element group are connected (e.g., X = 7), a longitudinal scan is performed, and the state value Y2 corresponding to the minimum reflection coefficient is recorded. Based on Y1 and Y2, a second coordinate region can be defined, and the target state value coordinates are matched within this second coordinate region.

[0153] Specifically, all X and Y combinations in the second coordinate region can be added to an array, and the reflection coefficients corresponding to all combinations in the array can be scanned. The combination with the smallest reflection coefficient is determined as the target state value coordinate, i.e., the initial best matching point.

[0154] This embodiment, by employing the aforementioned process matching and initial matching scheme in the impedance matching of the tuning circuit, can quickly determine the target state value coordinates for impedance matching, shorten the matching time, and thus extend the service life of the radio frequency defrosting equipment.

[0155] Figure 8 A detailed flowchart of step 203 according to one embodiment of this application is shown.

[0156] like Figure 8 As shown, the initial thawing time is adjusted according to the mismatch frequency of the tuning circuit to obtain the target thawing time, including the following steps:

[0157] Step 801: The mismatch frequency of the tuning circuit at the beginning of the initial thawing time is taken as the initial mismatch frequency.

[0158] Step 802: Use the mismatch frequency of the tuning circuit when the food undergoes a phase change as the reference mismatch frequency, and obtain the actual time consumed for the tuning circuit to change from the initial mismatch frequency to the reference mismatch frequency.

[0159] Step 803: Based on the initial mismatch frequency and the reference mismatch frequency, as well as the actual time consumed, determine the theoretical thawing time required for the radio frequency thawing device to thaw the food.

[0160] Step 804: Determine the difference between the initial thawing time and the actual consumption time as the initial remaining thawing time, and determine the difference between the theoretical thawing time and the actual consumption time as the theoretical remaining thawing time.

[0161] Step 805: If the theoretical remaining thawing time and the initial remaining thawing time are not approximately equal, the theoretical remaining thawing time is determined as the target thawing time.

[0162] It should be understood that, in the initial stage of thawing, most of the free water in the food exists in the form of ice. Since ice has a low specific heat capacity, when the absorbed energy is constant, the temperature rise of the food is higher than in the later stages. Therefore, the form change of the free water inside the food is greater, and the tuning matching capacitor becomes mismatched faster. Figure 9 A graph showing the variation of mismatch frequencies according to an embodiment of this application is provided, where curves 1 and 2 are typical mismatch frequency curves for two ingredients. Ingredients with lower and higher mass, as well as ingredients with lower and higher moisture content, may exhibit significant differences in radio frequency at the end of the thawing process.

[0163] In practical implementation, the mismatch frequency of the tuning circuit at the beginning of the initial thawing time can be taken as the initial mismatch frequency, denoted as F1. The mismatch frequency after the food enters the phase transition state can be taken as the reference mismatch frequency, denoted as F2. The actual time consumed from the initial mismatch frequency F1 to the reference mismatch frequency F2 is recorded as t1. From this, the theoretical thawing time t2 required to thaw the food can be estimated. The difference between the initial thawing time t0 and the actual consumed time t1, t0-t1, is determined as the initial remaining thawing time. The difference between the theoretical thawing time t2 and the actual consumed time t1, t2-t1, is determined as the theoretical remaining thawing time. If the theoretical remaining thawing time is close to the initial remaining thawing time, thawing continues according to the initial remaining thawing time t0-t1; otherwise, the remaining time is corrected to the theoretical remaining thawing time t2-t1.

[0164] This embodiment uses the mismatch frequency of the tuning circuit during the food thawing process to redetermine the thawing time of the food, which is equivalent to a certain correction to the initial thawing time, and can improve the accuracy of the radio frequency thawing device in thawing food to a certain extent.

[0165] Figure 10 A detailed flowchart of step 203 according to another embodiment of this application is shown.

[0166] like Figure 10 As shown, the initial thawing time is adjusted according to the reflection coefficient of the tuning circuit to obtain the target thawing time, including the following steps:

[0167] Step 1001: During the defrosting of food using the radio frequency defrosting device, determine whether the reflectance coefficient undergoes a sudden change.

[0168] Step 1002: If the reflection coefficient changes abruptly, obtain the actual time consumed by the radio frequency defrosting device from the start of defrosting to the change in reflection coefficient, the initial mismatch frequency of the tuning circuit at the beginning of the initial defrosting time, and the reference mismatch frequency of the tuning circuit when the reflection coefficient changes abruptly.

[0169] Step 1003: Based on the initial mismatch frequency and the reference mismatch frequency, as well as the actual time consumed, determine the theoretical thawing time required for the radio frequency thawing device to thaw the food.

[0170] Step 1004: Determine the difference between the initial thawing time and the actual consumption time as the initial remaining thawing time, and determine the difference between the theoretical thawing time and the actual consumption time as the theoretical remaining thawing time.

[0171] Step 1005: If the theoretical remaining thawing time and the initial remaining thawing time are not approximately equal, the theoretical remaining thawing time is determined as the target thawing time.

[0172] It should be understood that when thawing food with a high water content, especially food containing a significant amount of ice, the ice will continuously melt into water during the thawing process. This water may flow freely within the thawing chamber. This flowing water causes changes in the impedance of the thawing chamber; therefore, even in the later stages of thawing, the reflection coefficient may not have a stable region and may even exhibit frequent changes. Figure 11 A schematic diagram illustrating the variation trend of the reflectance coefficient according to one embodiment of this application is shown. Figure 11 As shown, the state of food during the thawing process is a slow change, so the reflectance coefficient usually changes uniformly and slowly, without any abrupt changes. Figure 11 In step 1, the ice melts into water and flows to a new, stable location. At this point, the reflectance coefficient abruptly changes to a new value and then continues to change slowly and uniformly. The control equipment can continuously monitor the reflectance coefficient and record its historical data. When a sudden change in the reflectance coefficient is detected, it indicates that a large amount of water has undergone a phase change. Therefore, the timing of this sudden change in reflectance coefficient can be used to adjust the thawing time.

[0173] In the specific implementation, if the reflection coefficient changes abruptly, the actual time t1 consumed by the RF defrosting device from the start of defrosting to the change in reflection coefficient is obtained, along with the initial mismatch frequency F1 of the tuning circuit at the beginning of the initial defrosting time, and the reference mismatch frequency F2 of the tuning circuit when the reflection coefficient changes abruptly. Based on the initial mismatch frequency F1, the reference mismatch frequency F2, and the actual time t1 consumed, the theoretical defrosting time t2 required for the RF defrosting device to defrost the food is determined. The difference t0-t1 between the initial defrosting time t0 and the actual time t1 consumed is determined as the initial remaining defrosting time, and the difference t2-t1 between the theoretical defrosting time t2 and the actual time t1 consumed is determined as the theoretical remaining defrosting time. If the theoretical remaining defrosting time is close to the initial remaining defrosting time, defrosting continues according to the initial remaining defrosting time t0-t1; otherwise, the remaining time is corrected to the theoretical remaining defrosting time t2-t1.

[0174] This embodiment uses the reflection coefficient of the tuning circuit during the food thawing process to redetermine the thawing time of the food, which is equivalent to making a certain correction to the initial thawing time, and to a certain extent, it can improve the accuracy of the radio frequency thawing device in thawing food.

[0175] It should be noted that unexpected situations may occur during the thawing process, such as the thawing chamber suddenly opening, accidental damage to the thawing system circuitry, or thawing of already thawed food. Therefore, abnormal handling logic can be designed into radio frequency thawing equipment to deal with unforeseen circumstances.

[0176] In one embodiment, the radio frequency defrosting device includes a defrosting chamber, and the control method further includes the following steps: during the defrosting of food by the radio frequency defrosting device, obtaining the drawer status of the defrosting chamber; when the drawer status is open, setting the target radio frequency power to zero.

[0177] Specifically, a microswitch can be installed in the drawer of the defrosting chamber. The drawer status is determined by detecting the state of the microswitch. For example, when the microswitch is in the open state, the drawer is open, and when the microswitch is in the closed state, the drawer is closed.

[0178] This embodiment improves the safety of the radio frequency defrosting device by stopping power output when the drawer of the defrosting chamber is detected to be opened during the defrosting process.

[0179] In one embodiment, the control method further includes the following steps: during the process of thawing food in the radio frequency thawing device, determining whether the radio frequency thawing device should repeat the thawing process based on whether the reflection coefficient changes abruptly at the initial thawing time.

[0180] It should be understood that the reflectance coefficient usually changes abruptly only when the thawing process is nearing its end. However, for food that has been thawed repeatedly, the reflectance coefficient may appear in the early stages of thawing. Therefore, if the reflectance coefficient changes abruptly in the early stages of the initial thawing time, it can be determined that the radio frequency thawing device has been used for thawing repeatedly.

[0181] This embodiment detects whether the reflection coefficient changes abruptly at the beginning of the initial thawing time to determine whether the radio frequency thawing device needs to be thawed repeatedly, thus avoiding abnormalities in the food due to excessively high temperatures.

[0182] In practice, the system's voltage, current, fan speed, temperature, and other status information can be monitored in real time during the defrosting process. If any of these parameters become abnormal, the power output will be stopped and an audible and visual alarm will be issued to improve the safety of the radio frequency defrosting equipment.

[0183] Figure 12 A block diagram of the control device of the radio frequency defrosting device in an embodiment of this application is shown.

[0184] like Figure 12 As shown, the control device 1200 of the radio frequency defrosting device according to the embodiment of this application can be provided in the radio frequency defrosting device as described above. The control device 1200 of the radio frequency defrosting device may include: a food identification unit 1201, used to identify the food in the radio frequency defrosting device and obtain food information; a matching control unit 1202, used to determine the target radio frequency power and initial defrosting time of the radio frequency defrosting device according to the food information; a time adjustment unit 1203, used to adjust the initial defrosting time according to the mismatch frequency or reflection coefficient of the tuning circuit to obtain the target defrosting time, wherein the mismatch frequency is used to characterize the frequency at which the tuning circuit is triggered for impedance matching, and the reflection coefficient is used to characterize the power consumption of the radio frequency power amplification circuit; and a defrosting control unit 1204, used to defrost the food according to the target radio frequency power and the target defrosting time.

[0185] Figure 13 An internal structural diagram of the control device of a radio frequency defrosting apparatus according to an embodiment of this application is shown.

[0186] like Figure 13 As shown, the control device of the radio frequency defrosting device includes one or more memories 1304, one or more processors 1302, and at least one computer program (program code) stored in the memory 1304 and executable on the processor 1302. When the processor 1302 executes the computer program, it implements the control method of the radio frequency defrosting device as described above.

[0187] Among them, Figure 13In this document, a bus architecture (represented by bus 1300) is used. Bus 1300 may include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 1302 and memory represented by memory 1304. Bus 1300 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 1305 provides an interface between bus 1300 and receiver 1301 and transmitter 1303. Receiver 1301 and transmitter 1303 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 1302 is responsible for managing bus 1000 and general processing, while memory 1304 can be used to store data used by processor 1302 during operation.

[0188] This application also proposes a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method for the radio frequency defrosting device described above.

[0189] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0190] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.

[0191] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0192] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0193] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A control method of a radio frequency thawing apparatus, characterized by, The radio frequency thawing device comprises a radio frequency power amplification loop and a tuning loop, the radio frequency power amplification loop is configured to output radio frequency power to the tuning loop, and the tuning loop is configured to perform impedance matching, and the method comprises: recognizing the food in the radio frequency thawing device to obtain food information; determining a target radio frequency power and an initial thawing time of the radio frequency thawing device according to the food information; adjusting the initial thawing time according to a mismatch frequency of the tuning loop to obtain a target thawing time, the mismatch frequency being used to represent how frequently the tuning loop is triggered to perform impedance matching; thawing the food according to the target radio frequency power and the target thawing time; the adjusting the initial thawing time according to the mismatch frequency of the tuning loop to obtain a target thawing time comprises: taking a mismatch frequency of the tuning loop at an initial stage of the initial thawing time as an initial mismatch frequency; taking a mismatch frequency of the tuning loop when the food undergoes a phase change as a reference mismatch frequency, and obtaining an actual consumption time of the tuning loop from the initial mismatch frequency to the reference mismatch frequency; determining a theoretical thawing time required by the radio frequency thawing device to thaw the food based on the initial mismatch frequency and the reference mismatch frequency and the actual consumption time; determining an initial remaining thawing time as a difference between the initial thawing time and the actual consumption time, and determining a theoretical remaining thawing time as a difference between the theoretical thawing time and the actual consumption time; if the theoretical remaining thawing time and the initial remaining thawing time do not satisfy approximate equality, determining the theoretical remaining thawing time as the target thawing time.

2. The method of claim 1, wherein, the recognizing the food in the radio frequency thawing device to obtain food information comprises: controlling the radio frequency thawing device to thaw the food according to a preset radio frequency power and a preset thawing time to determine response data of the tuning loop performing impedance matching within the preset thawing time; determining the food information according to the response data and a plurality of groups of sample data constructed in advance.

3. The method of claim 2, wherein, The preset radio frequency power is greater than the target radio frequency power.

4. The method of claim 2, wherein, The sample data comprises sample response data and sample characteristic parameters corresponding to the sample response data, the characteristic parameters being used to represent attribute states of the food, and the determining the food information according to the response data and the plurality of groups of sample data constructed in advance comprises: determining response data of the tuning loop performing impedance matching within a plurality of preset thawing times to obtain a plurality of groups of response data; for each group of target response data, determining a matching degree of the target response data and each group of sample response data, the matching degree being used to represent a closeness of the target response data to the sample response data, the target response data being any one of the plurality of groups of response data; calculating a comprehensive matching degree of the plurality of groups of response data and the same sample response data based on the matching degrees of the plurality of groups of response data and the same sample response data. Determine the sample characteristic parameter corresponding to the sample response data with the highest comprehensive matching degree as the food material information.

5. The method of claim 4, wherein, The method further comprises: The method further comprises:

6. The method of claim 1, wherein, The method further comprises: The method further comprises: Determine whether the impedance matching instruction is triggered for the first time; If the impedance matching instruction is not triggered for the first time, obtain a reference state value coordinate according to the state values of each energy storage element group when impedance matching is completed last time; 7. The method of claim 6, wherein, Match a target state value coordinate from a first coordinate region close to the reference state value coordinate to complete new impedance matching. The method further comprises: If the impedance matching instruction is triggered for the first time, determine a target energy storage element group in the energy storage element groups; When all the energy storage elements in the target energy storage element group are not connected, traverse the reflection coefficients of each state value of other energy storage element groups in the tuning circuit, and take the state value with the smallest reflection coefficient as a first state value, the other energy storage element groups being the energy storage element groups other than the target energy storage element group in the energy storage element groups; When all the energy storage elements in the target energy storage element group are connected, traverse the reflection coefficients of each state value of the other energy storage element groups in the tuning circuit, and take the state value with the smallest reflection coefficient as a second state value; 8. The method according to any one of claims 1 to 7, characterized in that, Match the target state value coordinate from a second coordinate region defined by the first state value and the second state value to complete impedance matching when the impedance matching instruction is triggered for the first time. The method further comprises: During the process of thawing food material by the radio frequency thawing device, obtain the drawer state of the thawing cavity; 9. The method according to any one of claims 1 to 7, characterized in that, If the drawer state is open, set the target radio frequency power to zero. The method further comprises:

10. A control device for a radio frequency thawing apparatus, characterized in that During the process of thawing food material by the radio frequency thawing device, determine whether the radio frequency thawing device is repeatedly thawing according to whether the reflection coefficient at the initial thawing time is mutated. The radio frequency thawing device comprises a radio frequency power amplification circuit and a tuning circuit, the radio frequency power amplification circuit is configured to output radio frequency power to the tuning circuit, and the tuning circuit is configured to perform impedance matching. A food material recognition unit is configured to recognize food material in the radio frequency thawing device to obtain food material information. A matching control unit is configured to determine a target radio frequency power and an initial thawing time of the radio frequency thawing device according to the food material information. a time adjustment unit configured to adjust the initial thawing time according to a mismatch frequency of the tuning loop, to obtain a target thawing time, the mismatch frequency being used to represent how frequently the tuning loop is triggered to perform impedance matching; a thawing control unit configured to thaw the food material according to the target radio frequency power and the target thawing time; the adjusting the initial thawing time according to the mismatch frequency of the tuning loop to obtain a target thawing time comprises: taking a mismatch frequency of the tuning loop at an initial thawing time as an initial mismatch frequency; taking a mismatch frequency of the tuning loop when the food material is in a phase change as a reference mismatch frequency, and obtaining an actual consumption time of the tuning loop from the initial mismatch frequency to the reference mismatch frequency; determining a theoretical thawing time of the radio frequency thawing device for thawing the food material based on the initial mismatch frequency and the reference mismatch frequency, and the actual consumption time; determining an initial remaining thawing time as a difference between the initial thawing time and the actual consumption time, and determining a theoretical remaining thawing time as a difference between the theoretical thawing time and the actual consumption time; if the theoretical remaining thawing time and the initial remaining thawing time do not satisfy approximate equality, determining the theoretical remaining thawing time as the target thawing time.

11. A control device of a radio frequency thawing apparatus comprising a memory and a processor, the memory storing a computer program, characterized in that, the processor executes the computer program to implement the steps of the method in any one of claims 1 to 9.

12. A computer readable storage medium having stored thereon a computer program, characterized in that, the computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 9.

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