Defrosting control method and device of radio frequency equipment and radio frequency equipment

Abstract

The application discloses a thawing control method and device of a radio frequency equipment and the radio frequency equipment, and the radio frequency equipment comprises a tuning loop, the method comprises the following steps: controlling the radio frequency equipment to run at least one constant power stage; in the process that the radio frequency equipment runs at the current constant power stage, controlling the tuning loop to execute at least one impedance matching, and obtaining an impedance matching result corresponding to the current constant power stage, wherein the impedance matching result comprises multi-dimensional impedance matching measured data; comparing the impedance matching measured data corresponding to the at least one constant power stage with an impedance matching sample data set to identify target food material information of a food material to be thawed, wherein the impedance matching sample data set comprises a mapping relationship between a plurality of food material information and impedance matching data. The application solves the technical problem of poor thawing effect of the radio frequency equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of thawing control, and in particular relates to a thawing control method and device for radio frequency equipment, and radio frequency equipment. Background Art

[0002] In daily life, residents usually keep food frozen and need to thaw it before the next consumption. Although the radio frequency equipment on the market can provide the automatic identification function of food, its accuracy in identifying food is not high, resulting in the radio frequency equipment being unable to accurately provide the radio frequency thawing parameters required for the thawing process of the food to be thawed, thus resulting in poor thawing effect of the radio frequency equipment. Summary of the Invention

[0003] The embodiments of the present invention provide a thawing control method and apparatus for a radio frequency device, and a radio frequency device, to solve the technical problem of poor thawing effect of the radio frequency device.

[0004] In a first aspect, an embodiment of the present invention provides a thawing control method for a radio frequency device, wherein the radio frequency device includes a tuning circuit, and the method includes: controlling the radio frequency device to operate at least one constant power stage; during the operation of the radio frequency device in the current constant power stage, controlling the tuning circuit to perform at least one impedance matching to obtain an impedance matching result corresponding to the current constant power stage, wherein the impedance matching result includes multi-dimensional impedance matching measured data; comparing the impedance matching measured data corresponding to the at least one constant power stage with an impedance matching sample data set to identify target ingredient information of the ingredient to be thawed, wherein the impedance matching sample data set includes a mapping relationship between multiple ingredient information and impedance matching data.

[0005] In combination with the first aspect of the present invention, in some embodiments, during the operation of the RF device in the current constant power stage, the tuning circuit is controlled to perform at least one impedance matching, including: obtaining an optimal capacitor matching combination; during the operation of the RF device in the current constant power stage, the tuning circuit is monitored to determine whether a load impedance imbalance occurs and whether the operation time of the current constant power stage reaches a preset time; each time a load impedance imbalance is detected during the preset time, the tuning circuit is triggered to re-perform an impedance matching; the impedance matching result is determined based on the recorded data of each impedance matching performed by the tuning circuit within the preset time and the optimal capacitor matching combination, wherein the multi-dimensional impedance matching measured data of the impedance matching result includes: the number of load impedance imbalances, the capacitance change trend of the tuning circuit, and the optimal capacitor matching combination.

[0006] In combination with the first aspect of the present invention, in some embodiments, the RF device includes a RF power amplifier circuit connected to the input end of the tuning circuit, and the tuning circuit includes multiple compensation capacitors. The process of controlling the tuning circuit to perform an impedance matching includes: adjusting the capacitance of the multiple compensation capacitors in the tuning circuit multiple times according to a preset adjustment rule so that the actual deviation between the output impedance of the RF power amplifier circuit and the preset impedance is less than a preset deviation threshold.

[0007] In combination with the first aspect of the present invention, in some embodiments, if the current constant power stage is the first constant power stage, obtaining the optimal capacitor matching combination includes: in response to the thawing instruction, adjusting the capacitance of the multiple compensation capacitors multiple times to obtain multiple capacitor matching combinations, obtaining the multiple capacitor matching combinations and the electrical parameters corresponding to each of the capacitor matching combinations, wherein the electrical parameters include the forward power output by the RF power amplifier circuit to the tuning circuit, and the reverse power output by the tuning circuit; according to the electrical parameters corresponding to each of the capacitor matching combinations, screening out the optimal capacitor matching combination from the multiple capacitor matching combinations.

[0008] In combination with the first aspect of the present invention, in some embodiments, if the current constant power stage is any constant power stage after the first constant power stage, obtaining the optimal capacitor matching combination includes: generating the optimal capacitor matching combination based on the recorded data of the previous constant power stage.

[0009] In combination with the first aspect of the present invention, in some embodiments, the at least one constant power stage has only a first constant power stage, and the impedance matching measured data corresponding to the at least one constant power stage is compared with the impedance matching sample data set to identify the target ingredient information of the food to be thawed, including: calculating the matching degree between the impedance matching measured data corresponding to the first constant power stage and each sample data in the impedance matching sample data set; if the matching degree between the impedance matching measured data and any one of the sample data is greater than a preset matching degree threshold, it indicates that the identification of the food to be thawed is successful, and the ingredient information of the sample data is used as the target ingredient information of the food to be thawed.

[0010] In combination with the first aspect of the present invention, in some embodiments, the at least one constant power stage includes N constant power stages, where N is an integer greater than 1, and the impedance matching measured data corresponding to the at least one constant power stage is compared with the impedance matching sample data set to identify the target ingredient information of the food to be thawed, including: for the N constant power stages, respectively calculating the matching degree between the impedance matching measured data of the N constant power stages and each sample data in the impedance matching sample data set to obtain N candidate matching degrees; screening out the maximum matching degree from the N candidate matching degrees; if the maximum matching degree is greater than the preset matching degree threshold, it indicates that the identification of the food to be thawed is successful, and the food information in the sample data corresponding to the maximum matching degree is used to calculate the target ingredient information of the food to be thawed.

[0011] In combination with the first aspect of the present invention, in some embodiments, controlling the RF device to operate at least one constant power stage includes: obtaining the forward power of the RF power amplifier circuit; performing PI control based on the forward power and the set power to adjust the forward power of the RF power amplifier circuit.

[0012] In combination with the first aspect of the present invention, in some embodiments, after identifying the target ingredient information of the food to be thawed, it also includes: determining the radio frequency thawing parameters corresponding to the target ingredient information based on the target ingredient information, wherein the target ingredient information includes one or more of the ingredient type, ingredient quality and initial temperature of the food to be thawed; controlling the radio frequency device to operate with the radio frequency thawing parameters to thaw the food to be thawed.

[0013] In a second aspect, an embodiment of the present invention provides a thawing control device for a radio frequency device, wherein the radio frequency device includes a tuning circuit, and the device includes: a power control unit, configured to control the radio frequency device to operate in at least one constant power stage; an impedance matching unit, configured to control the tuning circuit to perform at least one impedance matching during the operation of the radio frequency device in the current constant power stage, and obtain an impedance matching result corresponding to the current constant power stage, wherein the impedance matching result includes multi-dimensional impedance matching measured data; an identification unit, configured to compare the impedance matching measured data corresponding to the at least one constant power stage with an impedance matching sample data set, and identify target food information of the food to be thawed, wherein the impedance matching sample data set includes a mapping relationship between multiple food information and impedance matching data.

[0014] In a third aspect, an embodiment of the present invention provides a radio frequency device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the methods described in the first aspect when executing the computer program.

[0015] The one or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages:

[0016] An embodiment of the present invention provides a thawing control method for a radio frequency device, wherein the radio frequency device includes a tuning circuit, and the method includes: controlling the radio frequency device to operate in at least one constant power stage; during the operation of the radio frequency device in the current constant power stage, controlling the tuning circuit to perform at least one impedance matching to obtain an impedance matching result corresponding to the current constant power stage, wherein the impedance matching result includes multi-dimensional impedance matching measured data; comparing the impedance matching measured data corresponding to the at least one constant power stage with an impedance matching sample data set to identify target ingredient information of the ingredient to be thawed, wherein the impedance matching sample data set includes a mapping relationship between multiple ingredient information and impedance matching data. Since the different characteristics of different foods to be thawed are reflected in the measured impedance matching data of the circuit, the foods to be thawed can be identified by comparing the preset sample data and calculating the matching degree in combination with the number of load impedance imbalances, the capacitance change trend of the tuning circuit, and the optimal capacitance matching combination, so as to obtain the food type, food quality and initial temperature of the foods to be thawed. Thus, the radio frequency equipment can more accurately provide the radio frequency thawing parameters required for the foods to be thawed during the thawing process, so as to solve the technical problem that the thawing effect of the radio frequency equipment does not meet the standards and improve the thawing effect of the radio frequency equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of a radio frequency device according to an embodiment of the present invention;

[0019] Figure 2 This is a flow chart of a thawing control method for a radio frequency device according to an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of a method for calculating the matching degree between the food to be thawed and the sample food;

[0021] Figure 4 A schematic diagram showing the matching rule of the capacitance of the parallel capacitors of two sample data of food to be thawed;

[0022] Figure 5 A schematic diagram of the regularity of the imbalance frequency of the sample data of two kinds of food to be thawed;

[0023] Figure 6 This is a specific flow chart of a thawing control method for a radio frequency device according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic structural diagram of a thawing control device for a radio frequency device according to an embodiment of the present invention;

[0025] Figure 8 FIG. 4 is a functional module diagram of a power supply circuit of a radio frequency device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] In the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions of various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0028] The embodiment of the present invention provides a thawing control method for a radio frequency device, referring to Figure 1 As shown, the radio frequency device 10 includes a hardware system and a control system.

[0029] like Figure 1 As shown, the hardware system includes: a cavity 110 for accommodating food to be thawed; a tuning circuit 120 for compensating for load impedance imbalance caused by changes in the food state, wherein the load includes the cavity 110 and the food to be thawed placed in the cavity 110; an RF power amplifier circuit 130, connected to the input end of the tuning circuit 120, for outputting RF power to the tuning circuit 120 and providing RF thawing energy for thawing the food; an adjustable power supply 140, connected to the input end of the RF power amplifier circuit 130, for providing power to the entire RF device 10 and realizing the output voltage adjustment function.

[0030] like Figure 1As shown, the control system includes a power closed-loop control unit 150, which is used to sample the forward power signal and the reverse power signal, and output the control signal to the adjustable power supply 140 and the RF power amplifier circuit 130 to achieve a precise output power closed-loop control function; an automatic matching control unit 160, which is used to automatically collect the forward power signal and the reverse power signal to automatically send an impedance matching instruction to the tuning circuit 120 when the load impedance is misaligned; a food identification unit 180, which is used to identify the target food information of the food to be thawed, wherein the food information includes one or more of the food type, food quality and initial temperature of the food; and a thawing process control unit 170, which is used to control the RF device 10 to operate according to the RF thawing parameters based on the target food information obtained by identifying the food to be thawed and the needs of the thawing process.

[0031] It should also be noted that the radio frequency device 10 proposed in the embodiment of the present invention may be an independent device that thaws food by outputting radio frequency signals, or it may be a functional module integrated into a home appliance, wherein the home appliance may be a refrigerator.

[0032] refer to Figure 2 As shown, an embodiment of the present invention provides a thawing control method for a radio frequency device, comprising the following steps:

[0033] S201: Controlling the radio frequency device 10 to operate at least one constant power stage;

[0034] It is understandable that in order to improve the efficiency of identifying food information of the food to be thawed, only one constant power stage can be run. It is understandable that there may be accidental errors in the impedance matching measured data of a constant power stage for identifying food information of the food to be thawed, such as accidental errors in the impedance matching measured data during the recording process, temporary failure of a component of the radio frequency device 10, and jamming of the program operation of the radio frequency device 10, etc., which will cause accidental errors in the impedance matching measured data of only one constant power stage, thereby causing food information identification errors. Therefore, multiple constant power stages can be run, and the impedance matching measured data of multiple constant power stages can be used to perform multiple food identifications on the food to be thawed to avoid accidental errors in the testing process.

[0035] In step S101, controlling the operation of the RF device 10 in each constant power stage includes: obtaining the forward power of the RF power amplifier circuit 130; and performing PI (proportional integral controller) control based on the forward power and the set power to adjust the forward power of the RF power amplifier circuit 130 so that the RF device 10 operates at constant power.

[0036] It should be noted that PI control generates an output signal based on a differential signal between the set power and the forward power. This output signal is used to control the output voltage of adjustable power supply 140. By adjusting the output voltage of adjustable power supply 140, the forward power output of RF power amplifier circuit 130 is adjusted to stabilize the forward power. Due to power loss in the circuit, the forward power cannot be guaranteed to be equal to the set power, resulting in unstable forward power and inaccurate identification of the thawed food. Therefore, PI control adjusts the forward power based on the differential signal to stabilize the forward power, thereby improving the accuracy of food identification.

[0037] Specifically, if the forward power is less than the set power, the output signal of the PI control is used to control the output voltage of the adjustable power supply 140 to increase so as to increase the forward power. If the forward power is greater than the set power, the output signal of the PI control is used to control the voltage of the adjustable power supply 140 to decrease so as to decrease the forward power. If the forward power is equal to the set power, the output signal of the PI control is used to control the voltage of the adjustable power supply 140 to remain unchanged so as to maintain the forward power unchanged.

[0038] S202: During the operation of the current constant power stage, the RF device 10 controls the tuning circuit 120 to perform at least one impedance matching operation to obtain an impedance matching result corresponding to the current constant power stage, wherein the impedance matching result includes multi-dimensional impedance matching measured data.

[0039] It is understandable that, when the radio frequency device 10 is operating in the current constant power phase, controlling the tuning loop 120 to perform at least one impedance matching operation may include the following steps S2021 to S2024:

[0040] S2021. Obtain an optimal capacitor matching combination.

[0041] The optimal capacitor matching combination can be obtained before entering the current constant power stage. It should be noted that a plurality of compensation capacitors are provided in the tuning circuit 120. Specifically, the plurality of compensation capacitors may include a series capacitor connected in series with the load, and a parallel capacitor connected in parallel with the load. The number of series capacitors may be one or more, and the number of parallel capacitors may be one or more. For example, three parallel capacitors and five series capacitors are provided in the tuning circuit 120. In actual implementation, the compensation capacitors may be partially or completely replaced with compensation inductors.

[0042] In S202, the method for obtaining the optimal capacitor matching combination is different depending on whether the current constant power stage is the first constant power stage:

[0043] If the current constant power stage is the first constant power stage, obtaining the optimal capacitor matching combination includes: in response to the thawing instruction, adjusting the capacitance of multiple compensation capacitors multiple times to obtain multiple capacitor matching combinations, obtaining multiple capacitor matching combinations and electrical parameters corresponding to each capacitor matching combination, wherein the electrical parameters include the forward power output by the RF power amplifier circuit 130 to the tuning circuit 120, and the reverse power output by the tuning circuit 120; according to the electrical parameters corresponding to each capacitor matching combination, screening out the optimal capacitor matching combination from the multiple capacitor matching combinations.

[0044] It should be noted that the optimal capacitor matching combination of any constant power stage after the first constant power stage is generated based on the recorded data of the previous constant power stage. For example, in the first constant power stage, each recorded capacitor matching combination corresponds to a reflection coefficient, and the capacitor matching combination corresponding to the minimum reflection coefficient is the optimal capacitor matching combination in the second constant power stage.

[0045] It can be understood that there are many types of electrical parameters. Below, taking the electrical parameters including forward power and reverse power as an example, the quotient of reverse power divided by forward power can be used as the reflection coefficient. Therefore, a reflection coefficient value is calculated for each capacitor matching combination, and the capacitor matching combination corresponding to the smallest reflection coefficient value among multiple capacitor matching combinations is used as the optimal capacitor matching combination.

[0046] The minimum reflection coefficient corresponds to the smallest actual deviation between the output impedance of the RF power amplifier circuit 130 and the preset impedance, minimizing the output power loss of the RF power amplifier circuit 130. Consequently, the load can absorb maximum power, avoiding excessive energy loss. Therefore, the capacitor matching combination corresponding to the minimum reflection coefficient is the optimal capacitor matching combination. The preset impedance is the internal impedance of the RF power amplifier circuit 130.

[0047] S2022. During the operation of the current constant power phase, the RF device 10 monitors whether load impedance imbalance occurs and whether the operation duration of the current constant power phase reaches a preset duration. Each time a load impedance imbalance is detected during the preset duration, the tuning circuit 120 is triggered to re-perform impedance matching.

[0048] It is understandable that the dielectric constant of the food will continue to change during the thawing process, causing the impedance jointly formed by the food and the cavity 110 to change, which will also cause the load impedance to be imbalanced. Once the load impedance imbalance occurs, it will trigger an impedance matching to reduce the actual deviation between the output impedance of the RF power amplifier circuit 130 and the preset impedance, so that the actual deviation is less than the preset deviation threshold.

[0049] It should be noted that when it is monitored that the actual deviation between the output impedance of the RF power amplifier circuit 130 and the preset impedance is not less than the preset deviation threshold, it is determined that the load impedance imbalance occurs.

[0050] Specifically, the process of triggering the tuning circuit 120 to perform an impedance matching includes: adjusting the capacitance of each compensation capacitor in the tuning circuit 120 multiple times according to a preset adjustment rule until the actual deviation between the output impedance of the RF power amplifier circuit 130 and the preset impedance is adjusted to be less than a preset deviation threshold, thereby ending the current impedance matching process.

[0051] It should be understood that each time the capacitance of each compensation capacitor in the tuning circuit 120 is adjusted, a corresponding capacitance matching combination will be generated. Therefore, since the capacitance of the compensation capacitor is adjusted multiple times in one impedance matching process, one impedance matching process will generate multiple capacitance matching combinations.

[0052] S2023. Determine an impedance matching result based on the recorded data of each impedance matching performed by the tuning loop 120 within a preset time period and the optimal capacitance matching combination, wherein the multi-dimensional impedance matching measured data of the impedance matching result includes: the number of load impedance imbalances, the capacitance change trend of the tuning loop 120, and the optimal capacitance matching combination.

[0053] It should be noted that the number of load impedance mismatches refers to the number of times, during the current constant power phase, the actual deviation between the output impedance of the RF power amplifier circuit 130 and the preset impedance is no less than a preset deviation threshold, and the capacitor matching combination is adjusted to bring the actual deviation back below the preset deviation threshold. The capacitance change trend of the tuning circuit 120 refers to the capacitance change trend of each compensation capacitor in the tuning circuit 120.

[0054] Specifically, the capacitance variation trend of the compensation capacitor may only include the capacitance variation trend of the parallel capacitor connected in parallel with the load.

[0055] S203: Comparing the impedance matching measured data corresponding to at least one constant power stage with the impedance matching sample data set to identify target food information of the food to be thawed, wherein the impedance matching sample data set includes a mapping relationship between multiple food information and impedance matching data.

[0056] It should be noted that in each piece of sample data, the mapping relationship between the food information and the impedance matching data refers to the mapping relationship between the food information and the impedance matching data of the same sample food, wherein the food information of the sample food includes: one or more of the food type, food quality and initial temperature of the food, and the impedance matching data mapped thereto is the number of load impedance imbalances, the capacitance change trend of the tuning circuit 120 and the optimal capacitance matching combination obtained in advance by conducting a thawing test on the sample food.

[0057] Taking multiple compensation capacitors as series capacitors connected in series with the load and parallel capacitors connected in parallel with the load, and the capacitance change trend as the capacitance change trend of the parallel capacitors as an example, referring to Table 1, each sample data in the impedance matching sample data set is illustrated:

[0058] Table 1.

[0059]

[0060] If only the first constant power phase is executed in step S101, the implementation of S203 may include the following steps: calculating the degree of match between the impedance matching measured data corresponding to the first constant power phase and each piece of sample data in the impedance matching sample data set; if the degree of match between the impedance matching measured data and any piece of sample data exceeds a preset matching degree threshold, it indicates that the to-be-defrosted food has been successfully identified, and the food information of that piece of sample data is used as the target food information of the to-be-defrosted food. Using only the impedance matching measured data from the first constant power phase to calculate the degree of match can improve the efficiency of to-be-defrosted food identification.

[0061] If multiple constant power stages are run in step S101, the implementation of S203 may include the following steps: after running N constant power stages to obtain N impedance matching measured data for the N constant power stages, for each of the N constant power stages, calculating the matching degree between the impedance matching measured data for the N constant power stages and each piece of sample data in the impedance matching sample data set to obtain N candidate matching degrees; screening the maximum matching degree from the N candidate matching degrees; if the maximum matching degree is greater than a preset matching degree threshold, indicating successful identification of the to-be-thawed food, the food information in the piece of sample data corresponding to the maximum matching degree is used to calculate the food information as the target food information for the to-be-thawed food. Screening the maximum matching degree for multiple constant power stages is intended to avoid accidental errors.

[0062] Taking the preset matching threshold of 80% as an example, refer to Table 2 and Table 3 to illustrate how to screen the maximum matching degree in multiple constant power stages:

[0063] Table 2. First constant power stage:

[0064] Sample ingredients Ingredient B Ingredient C Ingredients D Compatibility with food A to be thawed 50％ 60％ 82％

[0065] Table 3. Second constant power stage:

[0066] Sample ingredients Ingredient B Ingredient C Ingredients D Compatibility with food A to be thawed 52％ 61％ 78％

[0067] In the first constant power stage, the maximum matching degree of 82% is used as the candidate matching degree for the first constant power stage, and in the second constant power stage, the maximum matching degree of 78% is used as the candidate matching degree for the second constant power stage. It can be determined that the maximum matching degree is 82%, which is greater than the preset matching degree threshold of 80%, so the ingredient information of ingredient D is used as the target ingredient information of ingredient A to be thawed.

[0068] refer to Figure 3 There are multiple methods for calculating the matching degree between the impedance matching measured data and the sample data. Below, taking the current constant power stage as the first constant power stage and the multiple compensation capacitors including series capacitors connected in series with the load and parallel capacitors connected in parallel with the load as an example, one calculation method is described, including the following steps S1 to S6:

[0069] S1: Obtain a piece of sample data from the impedance matching sample data set;

[0070] S2: Take the absolute value of the difference between the capacitance of the series capacitors of the optimal capacitor matching combination of the sample data and the capacitance of the series capacitors of the optimal capacitor matching combination in the first constant power stage, and record it as |ΔX|. If |ΔX| is equal to 0, the first score is 10 points. If |ΔX| is not equal to 0, the first score is 0 points.

[0071] S3: Take the absolute value of the difference between the capacitance of the parallel capacitors of the optimal capacitor matching combination of the sample data and the capacitance of the parallel capacitors of the optimal capacitor matching combination in the first constant power stage, and record it as |ΔY|. If |ΔY| is equal to 0, the second score is 100 points. If |ΔY| is equal to 1, the second score is 90 points. If |ΔY| is equal to 2, the second score is 80 points. If |ΔY| is equal to 3, the second score is 50 points. If |ΔY| is greater than 3, the second score is 0 points.

[0072] S4: Difference between the number of load impedance offsets of the sample data and the number of load impedance offsets in the first constant power stage, and take the absolute value, which is recorded as |ΔN|. If |ΔN| is equal to 0, the third score is 50 points; if |ΔN| is equal to 1, the third score is 30 points; if |ΔN| is equal to 2, the third score is 10 points; if |ΔN| is greater than 2, the third score is 0 points;

[0073] S5: Compare the change trend of the capacitance of the parallel capacitor of the sample data with the change trend of the capacitance of the parallel capacitor in the first constant power stage to obtain a trend comparison parameter. If the trend comparison parameter is less than a trend-independent threshold, it is determined that the capacitance change trends are the same, and a fourth score of 80 points is obtained. If the trend comparison parameter is not less than the trend-independent threshold, it is determined that the capacitance change trends are different, and a fourth score of 0 points is obtained.

[0074] S6: Add the first score, the second score, the third score, and the fourth score to obtain a matching degree.

[0075] In combination with the load impedance imbalance times, the capacitance variation trend of the tuning loop 120 , and the optimal capacitance matching combination, the matching degree is calculated by comparing with the preset sample data, so that the identification result of the food to be thawed is more reliable.

[0076] It can be understood that after identifying the target ingredient information of the food to be thawed, it also includes: determining the radio frequency thawing parameters corresponding to the target ingredient information based on the target ingredient information, wherein the target ingredient information includes one or more of the ingredient type, ingredient quality and initial temperature of the food to be thawed; and controlling the radio frequency device 10 to operate with the radio frequency thawing parameters to thaw the food to be thawed.

[0077] In the above technical solution, the different characteristics of different foods to be thawed are reflected in the measured impedance matching data of the circuit. Therefore, by combining the number of load impedance imbalances, the capacitance change trend of the tuning loop 120, and the optimal capacitance matching combination, the matching degree can be calculated by comparing the preset sample data to identify the foods to be thawed, so as to obtain the food type, food quality and initial temperature of the foods to be thawed. Therefore, the radio frequency device 10 can more accurately provide the radio frequency thawing parameters required for the foods to be thawed during the thawing process, so as to solve the technical problem that the thawing effect of the radio frequency device 10 does not meet the standards, thereby improving the thawing effect of the radio frequency device 10.

[0078] Taking multiple compensation capacitors, including a series capacitor connected in series with the load and a shunt capacitor connected in parallel with the load, as an example, we illustrate how the measured data can be used to identify the food to be thawed:

[0079] During the entire thawing process, the capacitance of the series capacitor has a stronger randomness and uncertainty in the early and late stages of thawing than the capacitance of the parallel capacitor. Figure 4 The law shown is that the capacitance of parallel capacitors usually decreases first and then increases or remains unchanged. The more typical curve is Figure 4As shown in curves 1 and 2, different to-be-thawed foods exhibit significantly different patterns. This is due to differences in the water content of different to-be-thawed foods. When the to-be-thawed foods absorb the same amount of energy, the amount of water melted from ice in the free water is different. Therefore, different to-be-thawed foods require different parallel capacitor capacitances for matching and compensation. The differences in the to-be-thawed foods result in different curves of the capacitance of the parallel capacitor changing with temperature. Therefore, it can be seen that at different initial temperatures, different to-be-thawed foods have different matching values ​​of the capacitance of the parallel capacitor. Therefore, the type of to-be-thawed food can be judged based on the matching value of the capacitance of the parallel capacitor and the matching trend of the capacitance of the parallel capacitor.

[0080] The offset frequency refers to the number of times the load impedance is offset within a fixed time. The fixed time can be 3 minutes or longer. In the initial stage of thawing, most of the free water in the food to be thawed exists in the form of ice, and the specific heat capacity of ice is small. When the absorbed energy is constant, the temperature of the food to be thawed is higher than that in the later stage. Therefore, the form of the free water in the food to be thawed changes more greatly, and the load impedance is offset faster. Different water content and specific heat capacity of the food to be thawed will affect the shape of the offset frequency curve, such as Figure 5 As shown, Figure 5 Curves 1 and 2 in the figure are typical imbalance frequency curves of two types of food to be thawed. From the figure, we can see that different food to be thawed has different imbalance frequency curves, and therefore has different load impedance imbalance times. Therefore, the type of food to be thawed can be determined based on the load impedance imbalance times.

[0081] In order to facilitate understanding of the technical solutions provided by the embodiments of the present invention, the following reference Figure 6 Taking the first constant power stage and the second constant power stage as an example, the workflow of the above-mentioned thawing control method is described as follows:

[0082] Step 1: The first constant power stage is started, and the RF device 10 is controlled to operate at constant power to obtain the optimal capacitor matching combination;

[0083] Step 2: Determine whether load impedance imbalance occurs. If so, trigger the tuning circuit 120 to re-perform impedance matching and repeat step 2. If no load impedance imbalance occurs, determine whether the operating time of the first constant power stage reaches a preset time. If so, jump to step 3. If not, repeat step 2.

[0084] Step 3: Obtain the recorded data and impedance matching measured data of the first constant power stage;

[0085] Step 4: The second constant power stage is started, the RF device 10 is controlled to operate at constant power, and the optimal capacitor matching combination for the second stage is generated based on the recorded data of the first stage;

[0086] Step 5: Determine whether load impedance imbalance occurs. If so, trigger the tuning circuit 120 to re-perform impedance matching and repeat step 5. If no load impedance imbalance occurs, determine whether the operating time of the second constant power stage reaches a preset time. If so, jump to step 6. If not, repeat step 5.

[0087] Step 6: Obtain the recorded data and impedance matching measured data of the second constant power stage;

[0088] Step 7: Calculate the matching degree between the impedance matching measured data in the two constant power stages and each sample data in the impedance matching sample data set to obtain two candidate matching degrees. From the two candidate matching degrees, select the maximum matching degree.

[0089] Step 8: Determine whether the maximum matching degree is greater than a preset matching degree threshold. If the maximum matching degree is greater than the preset matching degree threshold, it indicates that the to-be-thawed food has been successfully identified, and jump to step 9. If the maximum matching degree is not greater than the preset matching degree threshold, it indicates that the to-be-thawed food has been unsuccessfully identified.

[0090] Step 9: The food information in the sample data corresponding to the maximum matching degree is used as the target food information of the food to be thawed. Based on the target food information, the radio frequency thawing parameters corresponding to the target food information are determined, and the radio frequency device 10 is controlled to operate with the radio frequency thawing parameters to thaw the food to be thawed.

[0091] Based on the same inventive concept, the embodiment of the present invention provides a thawing control device 20 for radio frequency equipment, referring to Figure 7 As shown, the radio frequency device includes a tuning circuit, and the thawing control device 20 of the radio frequency device includes: a power control unit 210, which is used to control the radio frequency device to operate at least one constant power stage; an impedance matching unit 220, which is used to control the tuning circuit to perform at least one impedance matching during the operation of the radio frequency device in the current constant power stage, and obtain an impedance matching result corresponding to the current constant power stage, wherein the impedance matching result includes multi-dimensional impedance matching measured data; an identification unit 230, which is used to compare the impedance matching measured data corresponding to at least one constant power stage with the impedance matching sample data set, and identify the target food information of the food to be thawed, wherein the impedance matching sample data set includes a mapping relationship between multiple food information and impedance matching data.

[0092] It can be understood that the impedance matching unit 220 includes: an optimal capacitance acquisition subunit 2210, which is used to obtain the optimal capacitance matching combination; a monitoring subunit 2220, which is used to monitor whether load impedance imbalance occurs and whether the operating time of the current constant power stage reaches a preset time when the RF device is running in the current constant power stage; a triggering subunit 2230, which is used to trigger the tuning circuit to re-perform impedance matching each time a load impedance imbalance is detected within a preset time; a result acquisition subunit 2240, which is used to determine the impedance matching result based on the recorded data of each impedance matching performed by the tuning circuit within the preset time and the optimal capacitance matching combination, wherein the multi-dimensional impedance matching measured data of the impedance matching result includes: the number of load impedance imbalances, the capacitance change trend of the tuning circuit and the optimal capacitance matching combination.

[0093] It can be understood that the tuning circuit includes multiple compensation capacitors, an impedance matching unit 220, and also includes: a trigger sub-unit 2230, which is specifically used to: adjust the capacitance of multiple compensation capacitors in the tuning circuit multiple times according to a preset adjustment rule, so that the actual deviation between the output impedance of the RF power amplifier circuit and the preset impedance is less than the preset deviation threshold.

[0094] It can be understood that if the current constant power stage is the first constant power stage, the impedance matching unit 220 also includes: an optimal capacitance acquisition subunit 2210, which is specifically used to: in response to the thawing instruction, adjust the capacitance of multiple compensation capacitors multiple times to obtain multiple capacitor matching combinations, obtain multiple capacitor matching combinations and electrical parameters corresponding to each capacitor matching combination, wherein the electrical parameters include the forward power output of the RF power amplifier circuit to the tuning circuit, and the reverse power output of the tuning circuit; according to the electrical parameters corresponding to each capacitor matching combination, select the optimal capacitor matching combination from the multiple capacitor matching combinations.

[0095] If the current constant power stage is any constant power stage after the first constant power stage, the impedance matching unit 220 includes an optimal capacitance acquisition subunit 2210, which is further used to generate an optimal capacitance matching combination based on the recorded data of the previous constant power stage.

[0096] It can be understood that at least one constant power stage has only the first constant power stage, and the identification unit 230 also includes: a calculation subunit 2310, which is used to calculate the matching degree between the impedance matching measured data corresponding to the first constant power stage and each sample data in the impedance matching sample data set; a judgment subunit 2320, which is used to determine that the identification of the to-be-thawed food is successful if the matching degree between the impedance matching measured data and any sample data is greater than a preset matching degree threshold, and use the food information of the sample data as the target food information of the to-be-thawed food.

[0097] It can be understood that at least one constant power stage includes N constant power stages, N is an integer greater than 1, and the identification unit 230 also includes: a calculation subunit 2310, which is used to calculate the matching degree between the impedance matching measured data of the N constant power stages and each sample data in the impedance matching sample data set for the N constant power stages, and obtain N candidate matching degrees; a screening subunit 2330, which is used to screen out the maximum matching degree from the N candidate matching degrees; and a judgment subunit 2320, which is used to determine that the identification of the to-be-thawed food is successful if the maximum matching degree is greater than a preset matching degree threshold, and to use the food information in the sample data corresponding to the maximum matching degree as the target food information of the to-be-thawed food.

[0098] It can be understood that the power control unit 210 also includes: a power acquisition subunit 2110, which is used to obtain the forward power of the RF power amplifier circuit; and a power adjustment subunit 2120, which is used to perform PI control based on the forward power and the set power to adjust the forward power of the RF power amplifier circuit.

[0099] The thawing control device 20 of the radio frequency device also includes: a thawing control unit 240, which is used to determine the radio frequency thawing parameters corresponding to the target ingredient information based on the target ingredient information after identifying the target ingredient information of the ingredient to be thawed, wherein the target ingredient information includes one or more of the ingredient type, ingredient quality and initial temperature of the ingredient to be thawed; and control the radio frequency device to operate with the radio frequency thawing parameters to thaw the ingredient to be thawed.

[0100] Based on the same inventive concept, an embodiment of the present invention further provides a power supply circuit for a radio frequency device, such as Figure 8 As shown, it includes a memory 804, a processor 802 and a computer program stored in the memory 804 and executable on the processor 802. The processor 802 executes the program to implement the steps described in any implementation of the thawing control method embodiment.

[0101] Among them, Figure 8In the embodiment of the present invention, a bus architecture (represented by bus 800) is shown. Bus 800 may include any number of interconnected buses and bridges, and bus 800 links together various circuits including one or more processors represented by processor 802 and memory represented by memory 804. Bus 800 may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 805 provides an interface between bus 800 and receiver 801 and transmitter 803. Receiver 801 and transmitter 803 may be the same component, namely a transceiver, which provides a unit for communicating with various other devices over a transmission medium. Processor 802 is responsible for managing bus 800 and general processing, while memory 804 may be used to store data used by processor 802 when performing operations.

[0102] Since the embodiment of the present invention reflects the different characteristics of different foods to be thawed in the measured impedance matching data of the circuit, it is possible to identify the foods to be thawed by comparing the preset sample data and calculating the matching degree in combination with the number of load impedance imbalances, the capacitance change trend of the tuning loop, and the optimal capacitance matching combination, so as to obtain the food type, food quality and initial temperature of the foods to be thawed. As a result, the radio frequency device can more accurately provide the radio frequency thawing parameters required for the foods to be thawed during the thawing process, so as to solve the technical problem that the thawing effect of the radio frequency device does not meet the standards, thereby improving the thawing effect of the radio frequency device.

[0103] 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 implementations are within the scope and spirit of the present invention 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, hardwiring, or a combination of any of these. Furthermore, each functional unit may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0104] In the several embodiments provided by the present invention, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, and can be electrical or other forms.

[0105] The units described as separate components may or may not be physically separate, and 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 may be selected according to actual needs to achieve the purpose of the present embodiment.

[0106] If the integrated unit is implemented in the form of 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 the present invention, 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. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0107] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A thawing control method for a radio frequency device, characterized in that: The radio frequency device includes a tuning loop, and the method includes: controlling the radio frequency device to operate in at least one constant power stage; During the operation of the current constant power stage, the radio frequency device controls the tuning circuit to perform at least one impedance matching to obtain an impedance matching result corresponding to the current constant power stage, wherein the impedance matching result includes multi-dimensional impedance matching measured data; during the operation of the current constant power stage, the radio frequency device controls the tuning circuit to perform at least one impedance matching, including: obtaining an optimal capacitor matching combination; during the operation of the current constant power stage, the radio frequency device monitors whether a load impedance imbalance occurs and whether the operation time of the current constant power stage reaches a preset time; each time a load impedance imbalance is detected during the preset time, the tuning circuit is triggered to re-perform an impedance matching; the impedance matching result is determined based on the recorded data of each impedance matching performed by the tuning circuit within the preset time and the optimal capacitor matching combination, wherein the multi-dimensional impedance matching measured data of the impedance matching result includes: the number of load impedance imbalances, the capacitance change trend of the tuning circuit, and the optimal capacitor matching combination; The impedance matching measured data corresponding to the at least one constant power stage is compared with an impedance matching sample data set to identify target food information of the food to be thawed, wherein the impedance matching sample data set includes a mapping relationship between multiple food information and impedance matching data.

2. The thawing control method of radio frequency equipment according to claim 1, characterized in that: The radio frequency device includes a radio frequency power amplifier circuit connected to an input end of the tuning circuit, and the tuning circuit includes a plurality of compensation capacitors. The process of controlling the tuning circuit to perform a primary impedance matching includes: According to a preset adjustment rule, the capacitance of the multiple compensation capacitors in the tuning loop is adjusted multiple times so that the actual deviation between the output impedance of the RF power amplifier loop and the preset impedance is less than a preset deviation threshold.

3. The thawing control method of radio frequency equipment according to claim 2, characterized in that: The current constant power stage is the first constant power stage; The obtaining of the optimal capacitor matching combination includes: In response to the thawing instruction, adjusting the capacitance of the plurality of compensation capacitors multiple times to obtain a plurality of capacitor matching combinations, and acquiring the plurality of capacitor matching combinations and electrical parameters corresponding to each of the capacitor matching combinations, wherein the electrical parameters include the forward power output by the radio frequency power amplifier circuit to the tuning circuit, and the reverse power output by the tuning circuit; An optimal capacitor matching combination is screened out from the plurality of capacitor matching combinations according to the electrical parameters corresponding to each of the capacitor matching combinations.

4. The thawing control method of radio frequency equipment according to claim 2, characterized in that: The current constant power stage is any constant power stage after the first constant power stage; The obtaining of the optimal capacitor matching combination includes: The optimal capacitor matching combination is generated based on the recorded data of the previous constant power stage.

5. The thawing control method of radio frequency equipment according to claim 1, characterized in that: The at least one constant power stage includes only a first constant power stage, and the impedance matching measured data corresponding to the at least one constant power stage is compared with the impedance matching sample data set to identify target food information of the food to be thawed, including: Calculating a matching degree between the impedance matching measured data corresponding to the first constant power stage and each piece of sample data in the impedance matching sample data set; If the matching degree between the impedance matching measured data and any one of the sample data is greater than a preset matching degree threshold, it indicates that the food to be thawed is identified successfully, and the food information of the sample data is used as the target food information of the food to be thawed.

6. The thawing control method of radio frequency equipment according to claim 5, characterized in that: The at least one constant power stage includes N constant power stages, where N is an integer greater than 1. The comparing the impedance matching measured data corresponding to the at least one constant power stage with the impedance matching sample data set to identify target food information of the food to be thawed includes: For the N constant power stages, respectively calculating the matching degree between the impedance matching measured data of the N constant power stages and each piece of sample data in the impedance matching sample data set to obtain N candidate matching degrees; Filtering the maximum matching degree from the N candidate matching degrees; If the maximum matching degree is greater than the preset matching degree threshold, it indicates that the to-be-thawed food is identified successfully, and the food information in a piece of sample data corresponding to the maximum matching degree is used to calculate the target food information of the to-be-thawed food.

7. The thawing control method of radio frequency equipment according to claim 2, characterized in that: The controlling the radio frequency device to operate in at least one constant power stage includes: Obtain the forward power of the RF power amplifier circuit; PI control is performed according to the forward power and the set power to adjust the forward power of the radio frequency power amplifier loop.

8. The thawing control method of radio frequency equipment according to claim 1, characterized in that: After identifying the target food information of the food to be thawed, the method further includes: Determining, based on the target food information, radio frequency thawing parameters corresponding to the target food information, wherein the target food information includes one or more of the food type, food quality, and food initial temperature of the food to be thawed; The radio frequency device is controlled to operate with the radio frequency thawing parameters to thaw the food to be thawed.

9. A thawing control device for radio frequency equipment, characterized in that: The radio frequency device includes a tuning circuit, and the apparatus includes: a power control unit, configured to control the radio frequency device to operate in at least one constant power stage; An impedance matching unit is configured to control the tuning circuit to perform at least one impedance matching during the current constant power phase of the RF device, and obtain an impedance matching result corresponding to the current constant power phase, wherein the impedance matching result includes multi-dimensional impedance matching measured data; control the tuning circuit to perform at least one impedance matching during the current constant power phase of the RF device, including: obtaining an optimal capacitor matching combination; monitor whether a load impedance imbalance occurs and whether the operating time of the current constant power phase reaches a preset time during the current constant power phase of the RF device; trigger the tuning circuit to re-perform an impedance matching each time a load impedance imbalance is detected during the preset time; determine the impedance matching result based on recorded data of each impedance matching performed by the tuning circuit within the preset time and the optimal capacitor matching combination, wherein the multi-dimensional impedance matching measured data of the impedance matching result includes: the number of load impedance imbalances, the capacitance change trend of the tuning circuit, and the optimal capacitor matching combination; An identification unit is used to compare the impedance matching measured data corresponding to the at least one constant power stage with the impedance matching sample data set to identify the target food information of the food to be thawed, wherein the impedance matching sample data set includes a mapping relationship between multiple food information and impedance matching data.

10. A radio frequency device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 8 when executing the computer program.

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