Control method for a heating device and heating device

Abstract

This invention provides a control method for a heating device and a heating device in general. The heating device includes a cavity, an electromagnetic wave generating module, a radiating element, and an impedance matching circuit connected in series between the electromagnetic wave generating module and the radiating element. The impedance matching circuit includes at least one adjustable element to change the reflection parameters of the electromagnetic wave generating module by adjusting the configuration of the impedance matching circuit. The control method includes: an error acquisition step: acquiring the error rate of each adjustable element; an impedance determination step: determining at least one configuration error impedance based on at least the nominal impedance and error rate of at least one adjustable element; and a parameter correction step: determining correction parameters corresponding to the configuration based on at least the error impedance, and replacing the nominal parameters of at least one configuration in a preset basic reference relationship with the correction parameters; wherein, the basic reference relationship records multiple configurations based on nominal parameters corresponding to nominal impedances, and these parameters participate in the control of the electromagnetic wave generating module.

Description

Technical Field

[0001] This invention relates to the field of food processing, and in particular to a control method and heating device for an electromagnetic wave heating device. Background Technology

[0002] During the freezing process, the quality of food is preserved; however, frozen food needs to be thawed before processing or consumption. To improve thawing efficiency and ensure thawing quality, electromagnetic wave heating devices are typically used to thaw food.

[0003] In existing technologies, the parameters controlling the operation of the electromagnetic wave generating system are determined based on the configuration of the impedance matching circuit. However, due to the precision limitations of the manufacturing process, the actual impedance of the adjustable component in the impedance matching circuit will differ from the nominal impedance. This leads to errors in the parameter comparison relationship designed based on the nominal impedance, resulting in a poorer defrosting effect. Summary of the Invention

[0004] One objective of the first aspect of the present invention is to overcome at least one technical defect in the prior art and provide a control method for a heating device.

[0005] A further objective of the first aspect of the present invention is to reduce control errors caused by the manufacturing process.

[0006] Another further objective of the first aspect of the invention is to reduce the time required for parameter correction.

[0007] A second aspect of the present invention is to provide an electromagnetic wave heating device.

[0008] According to a first aspect of the present invention, a control method for a heating device is provided, the heating device comprising a cavity for placing a workpiece, an electromagnetic wave generating module for generating an electromagnetic wave signal, a radiating element for radiating electromagnetic waves into the cavity, and an impedance matching circuit connected in series between the electromagnetic wave generating module and the radiating element, the impedance matching circuit comprising at least one adjustable element to change the reflection parameters of the electromagnetic wave generating module by adjusting the configuration of the impedance matching circuit, wherein the control method comprises:

[0009] Error acquisition step: Obtain the error rate of each of the adjustable elements;

[0010] Impedance determination step: Determine at least one error impedance of the configuration based on at least the nominal impedance and error rate of the at least one adjustable element, respectively;

[0011] Parameter correction steps: At least based on the error impedance, determine the correction parameters corresponding to the configuration, and replace the nominal parameters of at least one configuration in the preset basic comparison relationship with the correction parameters; wherein,

[0012] The basic reference relationship record contains multiple configurations based on the nominal parameters corresponding to the nominal impedance, and these parameters participate in the control of the electromagnetic wave generating module.

[0013] Optionally, the adjustable element includes a fixed capacitor or a fixed inductor, and a switch for individually switching the fixed capacitor or the fixed inductor on and off. The number of adjustable elements can be multiple, wherein...

[0014] In the impedance determination step, the error impedance is calculated according to a preset impedance formula based on the on / off state of the multiple adjustable elements, the nominal impedance, and the error rate.

[0015] Optionally, the plurality of adjustable elements include only one of the fixed capacitor and the fixed inductor. The plurality of fixed capacitors are configured to be connected in series with one of the switches, with one end connected in series between the electromagnetic wave generating module and the radiating element, and the other end grounded. The plurality of fixed inductors are configured to be connected in parallel with one of the switches and in series between the electromagnetic wave generating module and the radiating element.

[0016] The preset impedance formula is the sum of the product of the nominal impedance and the error rate of the adjustable element in the connected state.

[0017] Optionally, the adjustable element is a variable inductor or a variable capacitor with adjustable effective area, wherein,

[0018] In the impedance determination step, the error impedance is calculated according to a preset impedance formula based on the connectivity ratio of the at least one adjustable element, the nominal impedance, and the error rate.

[0019] Optionally, the number of adjustable elements is one, wherein,

[0020] The preset impedance formula is the product of the connectivity ratio, the nominal impedance, and the error rate.

[0021] Optionally, the error rate of each of the at least one adjustable element is less than or equal to an error threshold; and

[0022] When the error rate of the at least one adjustable element is equal to the error threshold, the error impedance is greater than or equal to a correction impedance.

[0023] Optionally, the control method further includes:

[0024] Impedance matching step: Adjust the configuration of the impedance matching circuit to meet preset matching conditions; wherein,

[0025] During the execution of the impedance matching step, the impedance determination step and the parameter correction step are performed.

[0026] Optionally, in the parameter correction step, the actual impedance of the configuration is first calculated based on the nominal impedance and the error impedance, and then the correction parameter is obtained or calculated based on the actual impedance.

[0027] Optionally, in the parameter correction step, the error parameter is calculated according to the error impedance using a preset parameter formula, and the correction parameter is the sum of the nominal parameter and the error parameter.

[0028] According to a second aspect of the present invention, a heating device is provided, comprising:

[0029] The cavity is used to hold the object to be processed;

[0030] Electromagnetic wave generator module, used to generate electromagnetic wave signals;

[0031] A radiating element for radiating electromagnetic waves into the cavity;

[0032] An impedance matching circuit, connected in series between the electromagnetic wave generating module and the radiating element, includes at least one adjustable element to change the reflection parameters of the electromagnetic wave generating module by adjusting the configuration of the impedance matching circuit; and

[0033] The controller is configured to perform any of the control methods described above.

[0034] This invention determines the error impedance of at least one configuration of the impedance matching circuit by using the nominal impedance and error rate of the adjustable element, and further corrects the relationship between the configuration and the parameters based on the error impedance, thereby reducing or even eliminating control errors caused by the manufacturing process, avoiding overheating or incomplete heating, and improving the user experience.

[0035] Furthermore, the impedance matching circuit of the present invention is composed of adjustable elements with an error rate less than an error threshold, and only performs parameter correction on configurations where the error impedance is greater than or equal to the correction impedance when the error rate is equal to the error threshold. This shortens the time for parameter correction while ensuring parameter accuracy and thus heating effect.

[0036] Furthermore, while performing impedance matching, the present invention also performs error impedance verification and parameter correction, reducing the number of times the on / off state of one or more adjustable components corresponding to the configuration is verified. This further shortens the time for parameter correction without significantly affecting the impedance matching efficiency.

[0037] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0038] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0039] Figure 1 This is a schematic structural diagram of a heating device according to an embodiment of the present invention;

[0040] Figure 2 yes Figure 1 A schematic structural diagram of the controller;

[0041] Figure 3 This is a schematic circuit diagram of an impedance matching circuit according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic flowchart of a control method for a heating device according to an embodiment of the present invention. Detailed Implementation

[0043] Figure 1 This is a schematic structural diagram of a heating device 100 according to an embodiment of the present invention. See also Figure 1 The heating device 100 may include a cavity 110, an electromagnetic wave generating system, and a controller 140.

[0044] The cavity 110 may include a cylinder and a door. The cylinder can be used to place the object to be processed 150. The door can be used to open and close the loading and unloading port of the cylinder.

[0045] The cylinder and door may be equipped with electromagnetic shielding features to reduce electromagnetic leakage. The cylinder may be made of metal and grounded.

[0046] The electromagnetic wave generating system may be at least partially disposed within or accessible to the cavity 110 to generate electromagnetic waves within the cavity 110, thereby heating the object to be processed 150.

[0047] The electromagnetic wave generating system may include an electromagnetic wave generating module 120, a radiating element 130 electrically connected to the electromagnetic wave generating module 120, an impedance matching circuit 125 connected in series between the electromagnetic wave generating module 120 and the radiating element 130, and a power supply for supplying power to the electromagnetic wave generating module 120 and the impedance matching circuit 125.

[0048] The electromagnetic wave generating module 120 is configured to generate electromagnetic wave signals. A radiating element 130 may be disposed within the cavity 110 to radiate electromagnetic waves into the cavity 110. The impedance matching circuit 125 may include at least one adjustable element to change the reflection parameters of the electromagnetic wave generating module 120 by adjusting the configuration of the impedance matching circuit 125. In this invention, at least one refers to one, two, or more than two; multiple refers to two, three, or more than three.

[0049] Figure 2 yes Figure 1 A schematic structural diagram of the controller 140. See also... Figure 2 The controller 140 may include a processing unit 141 and a storage unit 142. The storage unit 142 stores a computer program 143, which, when executed by the processing unit 141, is used to implement the control method and heating method of the embodiments of the present invention.

[0050] In some embodiments, the processing unit 141 may be configured to control the impedance matching circuit 125 to adjust its configuration to meet preset matching conditions.

[0051] The preset matching condition can be that the reflection parameter of the electromagnetic wave generating module 120 reaches a concave inflection point and the reflection parameter is less than a preset first reflection threshold. The processing unit 141 can be configured to control the impedance matching circuit 125 to switch to the configuration corresponding to this inflection point, so as to further improve the heating efficiency.

[0052] The reflection parameter can be the return loss S11. The reflection parameter can also be the reflected power value of the electromagnetic wave signal reflected back to the electromagnetic wave generation module 120.

[0053] In some further embodiments, the processing unit 141 may be configured to control the impedance matching circuit 125 to adjust its configuration to meet preset matching conditions and ensure heating efficiency when the configuration of the impedance matching circuit 125 remains unchanged for a preset continuous time or the reflection parameter is greater than a preset second reflection threshold. The second reflection threshold may be greater than the first reflection threshold.

[0054] In some further embodiments, the processing unit 141 may be configured to control the impedance matching circuit 125 to adjust its configuration when heating begins, obtain the reflection parameters corresponding to each configuration of the impedance matching circuit 125 and determine the initial optimal configuration based on the reflection parameters, and further determine the parameters according to the configuration-parameter comparison relationship based on the initial optimal configuration.

[0055] The parameters are set to participate in the control of the electromagnetic wave generating module 120. In this invention, the parameters may include at least one of the remaining heating time and heating power.

[0056] Specifically, the processing unit 141 can be configured to acquire the error rate of each adjustable element of the impedance matching circuit 125, determine at least one configured error impedance based on the nominal impedance and error rate of the adjustable element, further determine the corresponding correction parameter based on the error impedance, and replace the nominal parameter of at least one configured element in the preset basic comparison relationship with the correction parameter, so as to reduce or even eliminate control errors caused by the production process, avoid overheating or incomplete heating, and improve the user experience.

[0057] The error rate is the ratio of the difference between the actual impedance and the nominal impedance to the nominal impedance. A positive error rate indicates that the nominal impedance is too small; a negative error rate indicates that the nominal impedance is too large. Multiple configurations based on the nominal impedance and their corresponding nominal parameters can be recorded in the basic reference relationship and are pre-stored in storage unit 142.

[0058] In the first embodiment, the number of adjustable elements can be multiple. The adjustable elements of the impedance matching circuit 125 may include a fixed capacitor or a fixed inductor, and a switch for individually switching the fixed capacitor or the fixed inductor on and off. That is, the adjustable elements of the impedance matching circuit 125 may be a fixed capacitor and a switch for individually switching the fixed capacitor on and off, or a fixed inductor and a switch for individually switching the fixed inductor on and off.

[0059] The processing unit 141 can be configured to calculate the error impedance according to a preset impedance formula based on the on / off state, nominal impedance, and error rate of multiple adjustable elements, without needing to test the error impedance or actual impedance of each configuration using a testing instrument. The preset impedance formula can be determined based on the composition and specific connection relationship of the impedance matching circuit 125.

[0060] In some further embodiments, the adjustable elements of the impedance matching circuit 125 may include only one of a fixed capacitor and a fixed inductor. That is, each adjustable element is a fixed capacitor and a switch for individually switching the fixed capacitor on and off, or each adjustable element is a fixed inductor and a switch for individually switching the fixed inductor on and off.

[0061] Multiple fixed capacitors can be configured to be connected in series with a switch, with one end connected in series between the electromagnetic wave generating module 120 and the radiating element 130, and the other end grounded. Multiple fixed inductors can be configured to be connected in parallel with a switch, and in series between the electromagnetic wave generating module 120 and the radiating element 130.

[0062] The processing unit 141 can be configured to calculate the error impedance according to a preset impedance formula that sums the product of the nominal impedance and the error rate of the adjustable element in the connected state, in order to simplify the procedure.

[0063] In the second embodiment, the adjustable element can be a variable inductor or a variable capacitor with an adjustable effective area. The processing unit 141 can be configured to calculate the error impedance according to a preset impedance formula based on the connectivity ratio, nominal impedance, and error rate of at least one adjustable element, without requiring testing of the error impedance or actual impedance of each configuration using a testing instrument. In this embodiment, the nominal impedance is the maximum nominal impedance of the adjustable element; the connectivity ratio is the proportion of the nominal impedance of the adjustable element in the connected state; and the preset impedance formula can be determined based on the composition and specific connection relationships of the impedance matching circuit 125.

[0064] In some further embodiments, the number of adjustable elements in the impedance matching circuit 125 may be one. The processing unit 141 may be configured to calculate the error impedance according to a preset impedance formula that multiplies the connectivity ratio of the adjustable elements, the nominal impedance, and the error rate, to simplify the procedure.

[0065] In some embodiments, the error rate of the adjustable elements of the impedance matching circuit 125 can all be less than or equal to an error threshold to limit the error range and avoid excessive individual configuration errors that could seriously affect the heating effect.

[0066] When the error rate of the adjustable element is equal to the error threshold, the error impedance for parameter correction can be greater than or equal to a correction impedance. That is, the processing unit 141 only performs parameter correction on the configuration of the impedance matching circuit 125 where the error impedance may be greater than or equal to the correction impedance, so as to shorten the time for parameter correction while ensuring the heating effect.

[0067] The processing unit 141 can be configured to perform error impedance verification and parameter correction during the process of adjusting the configuration of the control impedance matching circuit 125 to meet the preset matching conditions, until the parameter correction is completed for all configurations that require parameter correction, so as to further shorten the time for parameter correction without significantly affecting the impedance matching efficiency.

[0068] In some embodiments, the processing unit 141 may be configured to first calculate the actual impedance of a configuration of the impedance matching circuit 125 based on the nominal impedance and the error impedance, and then obtain or calculate correction parameters based on the actual impedance. The storage unit 142 or the cloud server may store parameters corresponding to different impedances. The storage unit 142 may also store calculation formulas for calculating correction parameters based on the actual impedance.

[0069] In other embodiments, the processing unit 141 may be configured to calculate the error parameter corresponding to the error according to a preset parameter formula based on the error impedance, thereby simplifying the procedure. The correction parameter is the sum of the nominal parameter and the error parameter.

[0070] It should be noted that the heating device 100 of the present invention is particularly suitable for use in refrigerators, and the cavity 110 can be installed in a storage compartment of the refrigerator.

[0071] Figure 3 This is a schematic circuit diagram of an impedance matching circuit according to an embodiment of the present invention (in... Figure 3 In this text, "IN" indicates the end connected to the electromagnetic wave generating module 120; "OUT" indicates the end connected to the radiating element 130. (See also...) Figure 3 In some exemplary embodiments, the impedance matching circuit 125 may include a fixed inductor L connected in series between the electromagnetic wave generating module 120 and the radiating element 130, and a series branch of a plurality of fixed capacitors and switches connected in series between the electromagnetic wave generating module 120 and the radiating element 130 at one end and grounded at the other end.

[0072] exist Figure 3 In this embodiment, the multiple fixed capacitors may be capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, and capacitor C6. The capacitance values ​​of capacitors C1, C2, C3, C4, C5, and C6 may be different.

[0073] If one configuration of the impedance matching circuit 125 is such that capacitors C1, C2, C3, and C4 are in the off state, and capacitors C5 and C6 are in the connected state, the error impedance of this configuration is the sum of the product of the nominal impedance of capacitor C5 and the error rate, and the product of the nominal impedance of capacitor C6 and the error rate.

[0074] For example, if capacitor C5 has a nominal impedance of 32C and a tolerance of -C, and capacitor C6 has a nominal impedance of 64C and a tolerance of 3C, then the tolerance impedance of this configuration is 2C, and the actual impedance is 94C. Processing unit 141 can obtain or calculate the corresponding correction parameters based on the actual impedance 94C. Processing unit 141 can also calculate the error parameters based on the error impedance 2C according to a preset parameter formula, and then superimpose these error parameters onto the nominal parameters in the comparison relationship.

[0075] In some embodiments, the control method for the heating device 100 of the present invention may include an impedance matching step. The impedance matching step may control the impedance matching circuit 125 to adjust its configuration to meet preset matching conditions.

[0076] The preset matching condition can be that the reflection parameter of the electromagnetic wave generating module 120 reaches a concave inflection point and the reflection parameter is less than a preset first reflection threshold. The impedance matching step can control the impedance matching circuit 125 to switch to the configuration corresponding to this inflection point to further improve heating efficiency.

[0077] The reflection parameter can be the return loss S11. The reflection parameter can also be the reflected power value of the electromagnetic wave signal reflected back to the electromagnetic wave generation module 120.

[0078] In some further embodiments, the impedance matching step can be implemented by controlling the impedance matching circuit 125 to adjust its configuration to meet preset matching conditions and ensure heating efficiency, provided that the configuration of the impedance matching circuit 125 remains constant for a preset continuous time or the reflection parameter is greater than a preset second reflection threshold. The second reflection threshold may be greater than the first reflection threshold.

[0079] In some further embodiments, the impedance matching step may control the impedance matching circuit 125 to adjust its configuration at the start of heating, obtain the reflection parameters corresponding to each configuration of the impedance matching circuit 125, determine the initial optimal configuration based on the reflection parameters, and further determine the parameters according to the configuration and parameter comparison relationship based on the initial optimal configuration.

[0080] Figure 4 This is a schematic flowchart of a control method for a heating device according to an embodiment of the present invention. See also Figure 4 The control method for the heating device 100 of the present invention may further include the following steps:

[0081] Error acquisition step (step S402): Acquire the error rate of each adjustable element of the impedance matching circuit 125;

[0082] Impedance determination step (step S404): Determine the error impedance of at least one configuration of the impedance matching circuit 125 based on the nominal impedance and error rate of the adjustable element, respectively.

[0083] Parameter correction step (step S406): Determine the correction parameter corresponding to each configuration in step S404 based at least on the error impedance, and replace the nominal parameter of at least one configuration in the preset basic comparison relationship with the correction parameter.

[0084] The error rate is the ratio of the difference between the actual impedance and the nominal impedance to the nominal impedance. A positive error rate indicates that the nominal impedance is too low; a negative error rate indicates that the nominal impedance is too high. The basic reference relationship can record multiple configurations based on the nominal parameters corresponding to the nominal impedance.

[0085] The parameters are set to participate in the control of the electromagnetic wave generating module 120. In this invention, the parameters may include at least one of the remaining heating time and heating power.

[0086] The control method of the present invention determines the error impedance of at least one configuration of the impedance matching circuit 125 by the nominal impedance and error rate of the adjustable element, and further corrects the relationship between the configuration and the parameters based on the error impedance, thereby reducing or even eliminating control errors caused by the production process, avoiding overheating or incomplete heating, and improving the user experience.

[0087] Based on the first embodiment of the aforementioned impedance matching circuit 125, in the impedance determination step, the error impedance can be calculated according to a preset impedance formula based on the on / off state, nominal impedance, and error rate of multiple adjustable components, without the need to test the error impedance or actual impedance of each configuration using a testing instrument. The preset impedance formula can be determined based on the composition and specific connection relationship of the impedance matching circuit 125.

[0088] In a further embodiment based on the first embodiment of the aforementioned impedance matching circuit 125, in the impedance determination step, the preset impedance formula can be the sum of the product of the nominal impedance of the adjustable element in the connected state and the error rate, so as to simplify the procedure.

[0089] Based on the second embodiment of the aforementioned impedance matching circuit 125, in the impedance determination step, the error impedance can be calculated according to a preset impedance formula based on the connectivity ratio, nominal impedance, and error rate of the adjustable element, without the need to test the error impedance or actual impedance of each configuration using a testing instrument. In this embodiment, the nominal impedance is the maximum nominal impedance of the adjustable element; the connectivity ratio is the proportion of the nominal impedance of the adjustable element in the connected state; and the preset impedance formula can be determined based on the composition and specific connection relationship of the impedance matching circuit 125.

[0090] In a further embodiment of the second embodiment of the aforementioned impedance matching circuit 125, in the impedance determination step, the preset impedance formula can be the product of the connectivity ratio, the nominal impedance, and the error rate to simplify the procedure.

[0091] In some embodiments, during the impedance determination step, when the error rate of the adjustable element is equal to the error threshold, the error impedance can be greater than or equal to a correction impedance. That is, the impedance determination step can determine only the error impedance of the configuration where the error impedance is greater than or equal to a correction impedance when the error rate of the adjustable element is equal to the error threshold, so as to shorten the time for parameter correction while ensuring the heating effect.

[0092] In some embodiments, impedance determination and parameter correction steps can be performed during the impedance matching process to further reduce the time spent on parameter correction without substantially affecting impedance matching efficiency.

[0093] In some embodiments, during the parameter correction step, the actual impedance of the configuration can be calculated first based on the nominal impedance and the error impedance, and then the correction parameters can be obtained or calculated based on the actual impedance.

[0094] In other embodiments, during the parameter correction step, the error parameter can be calculated based on the error impedance according to a preset parameter formula to simplify the procedure. The correction parameter is the sum of the nominal parameter and the error parameter.

[0095] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A control method for a heating device, the heating device comprising a cavity for placing a workpiece, an electromagnetic wave generating module for generating electromagnetic wave signals, a radiating element for radiating electromagnetic waves into the cavity, and an impedance matching circuit connected in series between the electromagnetic wave generating module and the radiating element, the impedance matching circuit including at least one adjustable element to change the reflection parameters of the electromagnetic wave generating module by adjusting the configuration of the impedance matching circuit, wherein... The control method includes: Error acquisition step: Obtain the error rate of each of the adjustable elements; Impedance determination step: Determine at least one error impedance of the configuration based on at least the nominal impedance and error rate of the at least one adjustable element, respectively; Parameter correction steps: At least based on the error impedance, determine the correction parameters corresponding to the configuration, and replace the nominal parameters of at least one configuration in the preset basic comparison relationship with the correction parameters; wherein, The basic reference relationship record contains multiple configurations based on the nominal parameters corresponding to the nominal impedance, and these parameters participate in the control of the electromagnetic wave generating module.

2. The control method according to claim 1, wherein the adjustable element comprises a fixed capacitor or a fixed inductor, and a switch for individually switching the fixed capacitor or the fixed inductor on and off, and the number of adjustable elements is plurality of, wherein, In the impedance determination step, the error impedance is calculated according to a preset impedance formula based on the on / off state of the multiple adjustable elements, the nominal impedance, and the error rate.

3. The control method according to claim 2, wherein the plurality of adjustable elements comprises only one of the fixed capacitor and the fixed inductor, the plurality of fixed capacitors are configured to be connected in series with one of the switches, with one end connected in series between the electromagnetic wave generating module and the radiating element and the other end grounded, and the plurality of fixed inductors are configured to be connected in parallel with one of the switches and in series between the electromagnetic wave generating module and the radiating element, wherein, The preset impedance formula is the sum of the product of the nominal impedance and the error rate of the adjustable element in the connected state.

4. The control method according to claim 1, wherein the adjustable element is a variable inductor or a variable capacitor with adjustable effective area, wherein, In the impedance determination step, the error impedance is calculated according to a preset impedance formula based on the connectivity ratio of the at least one adjustable element, the nominal impedance, and the error rate.

5. The control method according to claim 4, wherein the number of adjustable elements is one, wherein, The preset impedance formula is the product of the connectivity ratio, the nominal impedance, and the error rate.

6. The control method according to claim 1, wherein, The error rates of at least one adjustable element are all less than or equal to an error threshold; and When the error rate of the at least one adjustable element is equal to the error threshold, the error impedance is greater than or equal to a correction impedance.

7. The control method according to claim 1, further comprising: Impedance matching step: Adjust the configuration of the impedance matching circuit to meet preset matching conditions; wherein, During the execution of the impedance matching step, the impedance determination step and the parameter correction step are performed.

8. The control method according to claim 1, wherein, In the parameter correction step, the actual impedance of the configuration is first calculated based on the nominal impedance and the error impedance, and then the correction parameter is obtained or calculated based on the actual impedance.

9. The control method according to claim 1, wherein, In the parameter correction step, the error parameter is calculated according to the error impedance using a preset parameter formula, and the correction parameter is the sum of the nominal parameter and the error parameter.

10. A heating device, comprising: The cavity is used to hold the object to be processed; Electromagnetic wave generator module, used to generate electromagnetic wave signals; A radiating element for radiating electromagnetic waves into the cavity; An impedance matching circuit, connected in series between the electromagnetic wave generating module and the radiating element, includes at least one adjustable element to change the reflection parameters of the electromagnetic wave generating module by adjusting the configuration of the impedance matching circuit. as well as A controller configured to perform the control method according to any one of claims 1-9.

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