Radio frequency unfreezing control method and device, radio frequency unfreezing device and refrigerator

Abstract

The radio frequency unfreezing control method comprises the following steps: acquiring load impedance information of a to-be-unfrozen article in a radio frequency unfreezing device; according to the load impedance information, impedance change acceleration information of impedance change of the object to be unfrozen in the unfreezing process is determined; according to the impedance change acceleration information, judging whether the current moment meets a thawing completion condition or not; and controlling the working state of the radio frequency thawing device according to the judgment result.

Description

Technical Field

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

[0002] Radio frequency thawing technology is widely used in various electrical devices, primarily for defrosting frozen food. During the thawing process, the items absorb the power radiated by the plates. The power absorbed by the items is related to their impedance. During the thawing process, the temperature of the food constantly changes, causing the impedance of the food to constantly change, and thus the power absorbed by the items to also change. Without a tuned circuit and a matching impedance network, a fixed frequency method can no longer achieve optimal RF output, resulting in poor thawing performance.

[0003] In related technologies, impedance matching of items to be thawed can be achieved by adjusting a matching impedance network or by adjusting a set frequency. The fixed-frequency method, which uses a matching impedance network, ensures optimal output throughout the thawing process. However, since the initial temperature, type, size, shape, and location of the items to be thawed are unpredictable, using these characteristics to determine whether the items are thawed properly can easily lead to misjudgment. Summary of the Invention

[0004] The present application aims to at least to some extent solve the technical problem of easily misjudging the completion of thawing. To this end, the present application provides a radio frequency thawing control method, device, radio frequency thawing device and refrigerator.

[0005] In a first aspect, an embodiment of the present application provides a radio frequency thawing control method, the radio frequency thawing control method comprising:

[0006] Obtaining load impedance information of items to be thawed in a radio frequency thawing device;

[0007] determining impedance change acceleration information of the impedance change of the item to be thawed during the thawing process according to the load impedance information;

[0008] Determining whether a thawing completion condition is met at the current moment based on the impedance change acceleration information;

[0009] The working state of the radio frequency thawing device is controlled according to the judgment result.

[0010] Judging whether the thawing of the items to be thawed is complete by using the second-order derivative of the impedance value of the items to be thawed does not depend on factors such as the quality, temperature and position of the items to be thawed. It can accurately judge whether the thawing of the items to be thawed is complete, reduces misjudgment of thawing completion, improves the accuracy of judging whether the thawing of the items to be thawed is complete, and thus improves the thawing effect of the items to be thawed.

[0011] In an optional embodiment of the present application, the step of determining whether the thawing completion condition is met based on the impedance change acceleration information includes:

[0012] Determine a difference between at least two impedance change accelerations; wherein the impedance change acceleration information includes a plurality of impedance change accelerations determined at predetermined time intervals;

[0013] If the difference is greater than or equal to the set value, it is determined that the thawing completion condition is met at the current moment.

[0014] In an optional embodiment of the present application, the difference includes a real part of the difference and an imaginary part of the difference, and the set value includes a set real part and a set imaginary part. If the difference is greater than or equal to the set value, the step of determining that the thawing completion condition is met includes:

[0015] If the real part of the difference is greater than or equal to the set real part and / or the imaginary part of the difference is greater than or equal to the set imaginary part, it is determined that the thawing completion condition is met.

[0016] In an optional embodiment of the present application, the step of determining impedance change acceleration information of the impedance change of the item to be thawed during the thawing process according to the load impedance information includes:

[0017] Determining the impedance change rate according to the load impedance values ​​at two adjacent moments and the obtained interval preset time, wherein the load impedance information includes a plurality of load impedance values ​​obtained at each interval preset time;

[0018] The impedance change acceleration of the impedance change is determined according to the impedance change speeds at two adjacent moments and the preset time.

[0019] In an optional embodiment of the present application, the step of obtaining the load impedance value of the item to be thawed in the radio frequency thawing device includes:

[0020] Obtaining a matching impedance value; wherein, under the condition that the radio frequency thawing device operates at a set frequency, adjusting the network impedance to minimize the reflected power of the radio frequency thawing device to obtain the matching impedance value;

[0021] The load impedance value is determined according to the matching impedance value; wherein the matching impedance value is complex conjugate to the load impedance value.

[0022] In an optional embodiment of the present application, the step of controlling the working state of the radio frequency thawing device according to the judgment result includes:

[0023] If the thawing completion condition is met at the current moment, the radio frequency thawing device is controlled to exit the thawing mode.

[0024] In a second aspect, an embodiment of the present application provides a radio frequency thawing control device, comprising:

[0025] An acquisition module, used to acquire load impedance information of the items to be thawed in the radio frequency thawing device;

[0026] a determination module, configured to determine impedance change acceleration information of impedance change of the item to be thawed during the thawing process according to the load impedance information;

[0027] a judgment module, configured to judge whether a thawing completion condition is met at the current moment based on the impedance change acceleration information;

[0028] The execution module controls the working state of the radio frequency thawing device according to the judgment result.

[0029] The beneficial effects of the radio frequency thawing device provided in the second aspect are the same as the beneficial effects of the radio frequency thawing method provided in the first aspect, and will not be repeated here.

[0030] In a third aspect, an embodiment of the present application provides a radio frequency thawing device, comprising:

[0031] Memory for storing computer programs;

[0032] A processor is configured to execute the computer program in the memory to implement the radio frequency thawing control method provided in the first aspect.

[0033] The beneficial effects of the radio frequency thawing device provided in the third aspect are the same as the beneficial effects of the radio frequency thawing method provided in the first aspect, and will not be repeated here.

[0034] In a fourth aspect, an embodiment of the present application provides a refrigerator, comprising:

[0035] Memory for storing computer programs;

[0036] A processor is configured to execute the computer program in the memory to implement the radio frequency thawing control method provided in the first aspect.

[0037] The beneficial effects of the refrigerator provided in the fourth aspect are the same as the beneficial effects of the radio frequency thawing method provided in the first aspect, and will not be repeated here.

[0038] In a fifth aspect, an embodiment of the present application provides a computer storage medium for storing a computer program, which, when executed, can implement the radio frequency thawing control method provided in the first aspect.

[0039] The beneficial effects of the computer storage medium provided in the fifth aspect are the same as the beneficial effects of the radio frequency thawing control method provided in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] Figure 1 The figure shows a block diagram of the composition of the radio frequency thawing device provided in an embodiment of the present application.

[0042] Figure 2 The relationship between conductivity and load impedance value is shown.

[0043] Figure 3 The relationship between the dielectric constant and the load impedance value is shown.

[0044] Figure 4 The relationship between the dielectric constant and temperature of different items to be thawed is shown.

[0045] Figure 5 The relationship between the dielectric loss factor and temperature of different items to be thawed is shown in FIG.

[0046] Figure 6 A flow chart of the radio frequency thawing control method provided in an embodiment of the present application is shown.

[0047] Figure 7 A flowchart of the sub-steps of step S100 of the radio frequency thawing control method provided in an embodiment of the present application is shown.

[0048] Figure 8 A flowchart of the sub-steps of step S200 of the radio frequency thawing control method provided in an embodiment of the present application is shown.

[0049] Figure 9 A flowchart of the sub-steps of step S300 of the radio frequency thawing control method provided in an embodiment of the present application is shown.

[0050] Figure 10 The figure shows a block diagram of the composition of the radio frequency thawing control device provided in an embodiment of the present application.

[0051] Figure numerals: 100 - RF thawing device, 120 - tuning module, 130 - plate, 140 - tuning inductor, 150 - including RF generating component, 152 - power module, 154 - power amplifier module, 154a - signal source, 154b - power amplifier circuit, 154c - detection circuit, 156 - control module, 10 - RF thawing control device, 11 - acquisition module, 12 - determination module, 13 - judgment module, 14 - execution module. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0054] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In addition, the descriptions of "first", "second", etc. in this application 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, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0056] See also Figure 1Radio frequency thawing technology is widely used in various electrical devices (e.g., radio frequency thawing devices, refrigerators, etc.), primarily for thawing food. Taking a radio frequency thawing device as an example, the application of radio frequency thawing technology is described. The radio frequency thawing device includes a radio frequency generating assembly 150 and a tuning module 120. The radio frequency generating assembly 150 includes a power module 152, a power amplifier module 154, and a control module 156. The power module 152, the power amplifier module 154, and the control module 156 are all electrically connected. The power module 152 is used to supply power to the power amplifier module 154 and the control module 156. The power amplifier module 154 is used to generate an initial signal of a set frequency. The control module 156 is used to control the operation of the circuits in the power module 152 and the power amplifier module 154. When the output power of the power amplifier module 154 needs to be adjusted, the control module 156 calculates a voltage regulation control instruction based on an internal algorithm and sends it to the power module 152. The power module 152 adjusts the voltage to change the output voltage of the power module 152.

[0057] The power amplifier module 154 includes a signal source 154a, a power amplifier circuit 154b and a detection circuit 154c. The signal source 154a is used to generate an initial signal of a set frequency (40.68MHz). The power amplifier circuit 154b is used to amplify the power of the initial signal, enhance the power of the initial signal, and output a power amplifier signal. The detection circuit 154c is used to detect the output power of the power amplifier signal and the reflected power reflected back from the tuning module 120, and feed it back to the control module 156.

[0058] The tuning module 120 includes a tuning inductor 140 and a plate 130 , which are electrically connected to the plate 130 and electrically connected to the power amplifier module 154 through the tuning inductor 140 . After receiving the power amplifier signal, the tuning module 120 radiates radio frequency energy to the food to quickly thaw the food.

[0059] During the thawing process, items primarily absorb the power radiated by the plates. The more power absorbed, the better the thawing effect. Reflected power is equal to the total power radiated by the plates minus the power absorbed by the food. In other words, the greater the reflected power, the less power absorbed by the item, and the less reflected power, the more power absorbed. Reflected power provides a direct indicator of the thawing quality of the item.

[0060] The power absorbed by the thawed item is related to its own impedance. During the thawing process, the temperature of the food constantly changes, causing the impedance of the food to constantly change, and thus the power absorbed by the item to change. Without a tuned circuit to match the impedance network, a fixed-frequency approach can no longer achieve optimal RF output, resulting in poor thawing performance.

[0061] In related technologies, impedance matching of items to be thawed can be achieved by adjusting a matching impedance network or by adjusting a set frequency. The fixed-frequency method, which uses a matching impedance network, ensures optimal output throughout the thawing process. However, since the initial temperature, type, size, shape, and location of the items to be thawed are unpredictable, using these characteristics to determine whether the items are thawed properly can easily lead to misjudgment.

[0062] The radio frequency thawing control method, device, radio frequency thawing device, refrigerator, and storage medium provided in the embodiments of the present application can improve the above-mentioned problems. The radio frequency thawing control method, device, radio frequency thawing device, refrigerator, and storage medium provided in the embodiments of the present application can accurately determine whether the thawing of the items to be thawed is complete, reducing the misjudgment of the thawing completion and improving the accuracy of the judgment of whether the thawing of the items to be thawed is complete, thereby improving the thawing effect of the items to be thawed.

[0063] The embodiment of the present application provides a radio frequency thawing control method. The radio frequency thawing control method provided by the embodiment of the present application can reduce the misjudgment of thawing completion, improve the accuracy of judging whether the thawing of the items to be thawed is complete, and thus improve the thawing effect of the items to be thawed.

[0064] During the thawing process, the items absorb RF energy, causing their temperature to rise, ultimately achieving the desired thawing effect. The more RF energy absorbed, the faster the thawing process. As the temperature of the items changes, their impedance also changes, making it impossible to maintain optimal output at a fixed frequency. A matching impedance network can be used to ensure that the entire RF thawing system maintains optimal output.

[0065] According to the formula Q = cmΔT, Q = Pt, where P represents the absorbed power (known), t represents the thawing time, Q represents the absorbed energy, c represents the specific heat capacity of the item to be thawed (which changes with temperature), m represents the mass of the item to be thawed, and ΔT represents the temperature change. The temperature change is the difference between the current temperature and the initial temperature. Since the initial temperature is unknown and the mass of the items to be thawed is unknown, the thawing time of the items to be thawed cannot be calculated using this formula.

[0066] Furthermore, for a single defrosting drawer, the mass can be determined by the impedance determined by the matching position. Because the distribution of the drawer's capacitance electric field is not absolutely uniform, the impedance values ​​for items placed in the center and at the corners vary. Therefore, for a single drawer, using the matching position to calculate food mass introduces random errors. Furthermore, structural errors (such as inductance structure errors and plate installation errors) can lead to different matching positions for the same ingredient in different drawers, resulting in structural errors in the calculated food mass. In other words, using the impedance value of an item to determine if it is defrosted is subject to random errors, which can easily lead to larger errors.

[0067] The items to be thawed are a mixture, and their conductivity and dielectric constant are affected by temperature changes. Since the water content of the items to be thawed is relatively high, during the thawing process, when the temperature of the items to be thawed approaches zero degrees, the shape of the ice crystals begins to change, and the equivalent conductivity and complex dielectric constant will show obvious changes.

[0068] The applicant has found through creative work that conductivity and dielectric constant have an impact on the impedance of the items to be thawed, such as Figure 2 As shown, in Figure 2 In the equation, the X-axis represents the imaginary part of the impedance, the Y-axis represents the real part of the impedance, and the Z-axis represents the conductivity. Within the range of conductivity, the real part of the impedance varies much more than the imaginary part, as shown in the following example: Figure 3 As shown, in Figure 3 In the figure, the X-axis represents the imaginary part of the impedance, the Y-axis represents the real part of the impedance, and the Z-axis represents the dielectric constant. Within the range of dielectric constant values, the range of variation of the imaginary part is much greater than that of the real part.

[0069] Temperature T determines the conductivity σ and dielectric constant ε; therefore, the structure size, placement, weight, σ and ε determine the impedance Z L At 27.12 MHz and 40.68 MHz, the dielectric loss factor was measured using the following conductivity conversion equation: σ = 2πfε″, where ε″ is the imaginary part of the complex dielectric constant.

[0070] like Figure 4 and Figure 5 As shown, Figure 4 The relationship between the dielectric constant and temperature of different items to be thawed is shown in FIG. Figure 5The relationship between the dielectric loss factor of different items to be thawed and temperature is shown. In the initial temperature range (< -18 °C) and the final temperature range (-3 °C < T < -1 °C), from the measured data, it can be seen that σ′ and ε′ have obvious changes in the final temperature range, and it is deduced that the impedance Z′ will also be different; for one-time thawing, after the food ingredients are placed, their size and position will not change, so Z′ is only a function of σ′ and ε′. Z′ = f(σ′, ε′). That is to say, in the final temperature range, σ′ and ε′ have obvious changes in the final temperature range, resulting in changes in Z′ in the final temperature range. The completion of thawing of the item to be thawed can be judged by the change rate of Z′.

[0071] That is to say, through creative labor, the applicant found that during the thawing process of the item to be thawed, in the final temperature range, the first derivative of the impedance value of the item to be thawed will have obvious changes, that is, the second derivative of the impedance value will have a mutation in the final temperature range. The completion of thawing of the item to be thawed can be judged by the second derivative of the impedance value. Judging whether the item to be thawed is thawed completely by means of the second derivative of the impedance value of the item to be thawed does not depend on factors such as the quality, temperature, and position of the item to be thawed, and can accurately judge whether the item to be thawed is thawed completely, reducing the misjudgment of thawing completion and improving the judgment accuracy of whether the item to be thawed is thawed completely, thus improving the thawing effect of the item to be thawed.

[0072] The following describes in combination with the drawings and refers to specific embodiments. The specific steps of the radio frequency thawing control method are as follows:

[0073] Please refer to Figure 6 , step S100, obtain the load impedance information of the item to be thawed in the radio frequency thawing device.

[0074] Before thawing, first place the item to be thawed in the radio frequency thawing device, and obtain the load impedance information of the item to be thawed during the thawing process. The load impedance information refers to the impedance value of the item to be thawed during the thawing process, which can be a continuous load impedance value or multiple discrete load impedance values obtained at intervals of a preset time.

[0075] The load impedance information can be obtained directly or calculated from other information, depending on the actual situation. One way to obtain the load impedance information will be listed below, specifically as steps S110 and S120.

[0076] Please refer to Figure 7 , where step S100 may include step S110 and step S120.

[0077] Step S110 , obtaining a matching impedance value. Here, under the condition that the RF thawing device 100 operates at a set frequency, the network impedance is adjusted to minimize the reflected power of the RF thawing device 100 , thereby obtaining the matching impedance value.

[0078] Under the condition that the RF thawing device 100 operates in a fixed frequency mode, in order to ensure that the RF thawing device 100 always maintains the optimal output, the network impedance can be adjusted to maximize the absorbed power of the object to be thawed, that is, minimize the reflected power of the object to be thawed. In other words, the network impedance that minimizes the reflected power at the current moment is the matching impedance value.

[0079] Among them, the matching impedance value can be directly detected.

[0080] Step S120: Determine the load impedance value according to the matching impedance value, wherein the matching impedance value and the load impedance value are complex conjugates.

[0081] After obtaining the matching impedance value, the load impedance value can be calculated through the matching impedance value. The matching impedance value and the load impedance value are in a complex conjugate relationship, that is, the load impedance value can be determined through the matching impedance value.

[0082] The load impedance value is the impedance value of the item to be thawed at the current moment.

[0083] See also Figure 6 In step S200, impedance change acceleration information of the impedance change of the item to be thawed during the thawing process is determined according to the load impedance information.

[0084] After obtaining the current load impedance value, impedance change acceleration information can be calculated based on multiple load impedance values ​​at adjacent moments. Impedance change acceleration information is the second derivative of the load impedance value. Specifically, a method for determining load change acceleration information is described below, such as steps S210 and S220.

[0085] The impedance change acceleration information may be a continuous value or multiple discrete values, that is, the impedance change acceleration information may include multiple impedance change accelerations.

[0086] See also Figure 8 , wherein step S200 may include step S210 and step S220.

[0087] Step S210 , determining the impedance change speed according to the load impedance values ​​at two adjacent moments and the acquired preset time.

[0088] The preset time is the interval between two adjacent load impedance values, and the impedance change speed can be calculated based on the two adjacent load impedance values ​​and the preset time.

[0089] Specifically, the difference between the load impedance values ​​obtained at two adjacent moments is first calculated, and then the ratio of the difference to the preset time is calculated to obtain the impedance change rate. In other words, the impedance change rate is the first-order derivative of the load impedance value with respect to time.

[0090] Step S220 , determining the impedance change acceleration of the impedance change according to the impedance change speeds at two adjacent moments and a preset time.

[0091] After obtaining the impedance change rate, the impedance change acceleration can be determined based on the impedance change rates calculated at two adjacent moments, that is, the second-order derivative of the load impedance value with respect to time can be determined.

[0092] Specifically, the difference in impedance change rates between two adjacent moments is calculated, and then the ratio of this difference to the preset time is calculated to obtain the impedance change acceleration. In other words, the impedance change acceleration is the first-order derivative of the load impedance with respect to time, and the impedance change acceleration is the second-order derivative of the load impedance with respect to time.

[0093] See also Figure 6 , step S300, judging whether the thawing completion condition is met at the current moment according to the impedance change acceleration information.

[0094] After calculating the impedance acceleration at the current moment, the impedance acceleration information can be used to determine whether the thawing of the items to be thawed is complete. Within the final temperature range, the impedance acceleration will have sudden changes, and whether the impedance acceleration changes suddenly can be used to determine whether the thawing completion conditions are met.

[0095] See also Figure 9 , wherein step S300 may include step S310 and step S320.

[0096] Step S310: Determine the difference between at least two impedance change accelerations, wherein the impedance change acceleration information includes a plurality of impedance change accelerations determined at predetermined time intervals.

[0097] The difference between at least two impedance change accelerations can be calculated to determine whether the impedance change acceleration has a sudden change. The acceleration difference can be obtained by determining the difference between two adjacent phase change accelerations. Specifically, the difference is obtained by subtracting the impedance change acceleration at a previous moment from the impedance change acceleration at a later moment.

[0098] In addition, the acceleration difference can also be calculated based on the difference of multiple impedance change accelerations. For example, the acceleration difference can be calculated based on the impedance change accelerations at three consecutive moments. For example, the limit change accelerations at three consecutive moments are A1, A2, and A3, respectively. The acceleration difference can be calculated according to the following formula: (A2+A3)-(A1+A2). Of course, the acceleration difference can also be calculated based on the impedance change accelerations at four consecutive moments. For example, the impedance change accelerations at four consecutive moments are A1, A2, A3, and A4, respectively. The acceleration difference can be calculated according to the following formula: (A3+A4)-(A1+A2).

[0099] In step S320, if the difference is greater than or equal to the set value, it is determined that the thawing completion condition is met at the current moment.

[0100] The set value is a preset value. Since different materials and masses of different items to be thawed or different positions of the items in the RF thawing device 100 cause changes in the load impedance value of the items to be thawed, and different ingredients have different jumps in the final temperature range, the set value can be a fixed value or a variable value.

[0101] In the initial temperature range, the impedance change acceleration can be considered to be almost zero, that is, the difference is also almost zero. When the temperature of the item to be thawed is near or within the final temperature range, the impedance change acceleration occurs, and the difference appears. Therefore, the set value can be a relatively small value.

[0102] If the difference is greater than or equal to the set value, it means that the impedance change acceleration changes suddenly between two adjacent moments. If the impedance change acceleration jumps, it can be judged that the temperature of the current item to be thawed is within the final temperature range, and it can be judged that the item to be thawed meets the conditions for thawing completion at the current moment.

[0103] Since the load impedance is a complex number, the impedance change acceleration is also a complex number, and the difference calculated between two adjacent moments is also a complex number. The difference consists of a real part and an imaginary part, and the set value consists of a set real part and a set imaginary part. If the real part of the difference is greater than or equal to the set real part and / or the imaginary part of the difference is greater than or equal to the set imaginary part, the thawing condition is determined to be met.

[0104] If the real part of the difference is greater than or equal to the set real part and / or the imaginary part of the difference is greater than or equal to the set imaginary part, there are three cases: the first is that only the real part of the difference is greater than or equal to the set real part, the second is that only the imaginary part of the difference is greater than or equal to the set imaginary part, and the third is that both the real part of the difference is greater than or equal to the set real part and the imaginary part of the difference is greater than or equal to the set imaginary part. If any of the above three cases occurs, it can be considered that the conditions for thawing are met.

[0105] See also Figure 6 , step S400, controlling the working state of the radio frequency thawing device 100 according to the judgment result.

[0106] The judgment result includes two situations: the thawing completion condition is met and the thawing completion condition is not met. If the thawing completion condition is met at the current moment, it means that the thawing is complete, and the radio frequency thawing device 100 can be controlled to exit the thawing mode. If the thawing completion condition is not met, steps S100 to S400 are repeated until the thawing completion condition is met.

[0107] In summary, the radio frequency thawing control method provided in the embodiment of the present application determines whether the thawing of the item to be thawed is complete by using the second-order derivative of the impedance value of the item to be thawed, which is independent of factors such as the quality, temperature and position of the item to be thawed. It can accurately determine whether the thawing of the item to be thawed is complete, reduces the misjudgment of the thawing completion, improves the accuracy of the judgment of whether the thawing of the item to be thawed is complete, and thus improves the thawing effect of the item to be thawed.

[0108] See also Figure 10 Based on the same inventive concept, the embodiment of the present application further provides a radio frequency thawing control device 10, which includes:

[0109] The acquisition module 11 is used to acquire the load impedance information of the object to be thawed in the radio frequency thawing device 100 .

[0110] The acquisition module 11 is used to acquire the matching impedance value. Here, under the condition that the RF thawing device 100 operates at a set frequency, the network impedance is adjusted to minimize the reflected power of the RF thawing device 100 to obtain the matching impedance value.

[0111] The acquisition module 11 is configured to determine a load impedance value according to a matching impedance value, wherein the matching impedance value is complex conjugate to the load impedance value.

[0112] Step S100 and its sub-steps of the radio frequency thawing control method provided in the embodiment of the present application may be executed by the acquisition module 11 .

[0113] The determination module 12 is configured to determine impedance change acceleration information of the impedance change of the item to be thawed during the thawing process according to the load impedance information.

[0114] The determination module 12 is configured to determine the impedance change speed according to the load impedance values ​​at two adjacent moments and the acquired preset time.

[0115] The determination module 12 is configured to determine an impedance change acceleration of the impedance change according to the impedance change speeds at two adjacent moments and a preset time.

[0116] Step S200 and its sub-steps of the radio frequency thawing control method provided in the embodiment of the present application may be executed by the determination module 12 .

[0117] The judgment module 13 is used to judge whether the thawing completion condition is met at the current moment according to the impedance change acceleration information.

[0118] The judgment module 13 is configured to determine a difference between at least two impedance change accelerations, wherein the impedance change acceleration information includes a plurality of impedance change accelerations determined at predetermined time intervals.

[0119] The judgment module 13 is used to determine that the thawing completion condition is met at the current moment if the difference is greater than or equal to a set value.

[0120] Step S300 and its sub-steps of the radio frequency thawing control method provided in the embodiment of the present application may be executed by the judgment module 13 .

[0121] The execution module 14 controls the working state of the radio frequency thawing device 100 according to the judgment result.

[0122] Step S400 and its sub-steps of the radio frequency thawing control method provided in the embodiment of the present application may be executed by the execution module 14 .

[0123] Based on the same inventive concept, an embodiment of the present application further provides a computer storage medium storing a computer program, which is executed by a processor to implement the above-mentioned radio frequency thawing control method.

[0124] Based on the same inventive concept, an embodiment of the present application further provides a radio frequency thawing device 100, comprising: a memory and a processor, wherein the memory is used to store a computer program; and the processor is used to execute the computer program in the memory to implement the above-mentioned radio frequency thawing control method.

[0125] Based on the same inventive concept, an embodiment of the present application also provides a refrigerator, comprising: a memory and a processor, the memory being used to store a computer program; the processor being used to execute the computer program in the memory to implement the above-mentioned radio frequency thawing control method.

[0126] Specifically, embodiments of the present application provide a radio frequency thawing control method and device, which are applied to a radio frequency thawing device 100 or a refrigerator. Both the radio frequency thawing device 100 and the refrigerator include a housing, a memory, a processor, a peripheral interface, and a radio frequency thawing control device 10. The memory and processor are both installed on the housing. The memory is used to store computer programs, and the processor is used to execute the computer programs stored in the memory to implement the radio frequency thawing control method described above.

[0127] The memory and processor components are electrically connected, directly or indirectly, to each other to enable data transmission or interaction. For example, these components can be electrically connected via one or more communication buses or signal lines. The RF thawing control device 10 includes at least one software functional module, which can be stored in the memory in the form of software or firmware or embedded in the server's operating system (OS). The processor is configured to execute executable modules 14 stored in the memory, such as the software functional modules and computer programs included in the RF thawing control device 10.

[0128] In one feasible embodiment, the processor can be an integrated circuit chip with signal processing capabilities. The processor can be integrated into the refrigerator or the radio frequency thawing device 100. The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), or a single-chip microcomputer, a microcontroller unit (MCU), a complex programmable logic device (CPLD), a field programmable gate array (FPGA), an application-specific integrated circuit (ASIC), an embedded ARM chip, etc. The processor can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application.

[0129] In a feasible embodiment, the memory is used to store program instructions that can be executed by the processor. For example, the radio frequency thawing control device 10 provided in the embodiment of the present application includes at least one that can be stored in the memory in the form of software or firmware. The memory can be an independent external memory, including but not limited to random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), and electrically erasable read-only memory (EEPROM). The memory can also be integrated with the processor, for example, the memory can be integrated with the processor in the same chip.

[0130] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0131] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When 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 required by this application.

[0132] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A radio frequency thawing control method, characterized in that: The radio frequency thawing control method includes: Obtaining load impedance information of items to be thawed in a radio frequency thawing device; determining impedance change acceleration information of the impedance change of the item to be thawed during the thawing process according to the load impedance information; Determining whether a thawing completion condition is met at the current moment based on the impedance change acceleration information; The working state of the radio frequency thawing device is controlled according to the judgment result.

2. The radio frequency thawing control method according to claim 1, characterized in that: The step of judging whether the thawing completion condition is met based on the impedance change acceleration information includes: Determine a difference between at least two impedance change accelerations; wherein the impedance change acceleration information includes a plurality of impedance change accelerations determined at predetermined time intervals; If the difference is greater than or equal to the set value, it is determined that the thawing completion condition is met at the current moment.

3. The radio frequency thawing control method according to claim 2, characterized in that: The difference includes a real part and an imaginary part of the difference, and the set value includes a set real part and a set imaginary part. If the difference is greater than or equal to the set value, the step of determining whether the thawing completion condition is met includes: If the real part of the difference is greater than or equal to the set real part and / or the imaginary part of the difference is greater than or equal to the set imaginary part, it is determined that the thawing completion condition is met.

4. The radio frequency thawing control method according to any one of claims 1 to 3, characterized in that: The step of determining impedance change acceleration information of the impedance change of the item to be thawed during the thawing process according to the load impedance information includes: Determining an impedance change rate based on load impedance values ​​at two adjacent moments and a preset acquisition time, wherein the load impedance information includes a plurality of load impedance values ​​acquired at intervals of a preset time; The impedance change acceleration of the impedance change is determined according to the impedance change speeds at two adjacent moments and the preset time.

5. The radio frequency thawing control method according to any one of claims 1 to 3, characterized in that: The step of obtaining the load impedance value of the object to be thawed in the radio frequency thawing device includes: Obtaining a matching impedance value; wherein, under the condition that the radio frequency thawing device operates at a set frequency, adjusting the network impedance to minimize the reflected power of the radio frequency thawing device to obtain the matching impedance value; The load impedance value is determined according to the matching impedance value; wherein the matching impedance value is complex conjugate to the load impedance value.

6. The radio frequency thawing control method according to claim 1, characterized in that: The step of controlling the working state of the radio frequency thawing device according to the judgment result includes: If the thawing completion condition is met at the current moment, the radio frequency thawing device is controlled to exit the thawing mode.

7. A radio frequency thawing control device, characterized in that: include: An acquisition module, used to acquire load impedance information of the items to be thawed in the radio frequency thawing device; a determination module, configured to determine impedance change acceleration information of impedance change of the item to be thawed during the thawing process according to the load impedance information; a judgment module, configured to judge whether a thawing completion condition is met at the current moment based on the impedance change acceleration information; The execution module controls the working state of the radio frequency thawing device according to the judgment result.

8. A radio frequency thawing device, characterized in that: include: Memory for storing computer programs; A processor, configured to execute the computer program in the memory to implement the radio frequency thawing control method according to any one of claims 1 to 6.

9. A refrigerator, characterized in that: include: Memory for storing computer programs; A processor, configured to execute the computer program in the memory to implement the radio frequency thawing control method according to any one of claims 1 to 6.

10. A computer storage medium, characterized in that Used to store a computer program, which, when executed, can implement the radio frequency thawing control method according to any one of claims 1 to 6.

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