Method for detecting matching degree of high-frequency induction heating coil

Abstract

The invention discloses a method for detecting the matching degree of a high-frequency induction heating coil, and relates to the technical field of high-frequency induction heating, and the main scheme is as follows: obtaining related parameters of the coil, calculating actual input current, output current, voltage and magnetic field intensity according to the parameters, and further calculating a power index and a magnetic field and current coupling index; the matching degree index is calculated according to the actual output index, a matching degree threshold set is set, the matching degree index is compared with the matching degree threshold set, the matching degree grade is determined, if the grade is not consistent, an alarm instruction is triggered, and alarm information is issued, and quantitative evaluation and fault early warning of the performance of the high-frequency induction heating coil are achieved in the whole process. And the reliability and the safety of the whole high-frequency induction heating system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of high-frequency induction heating, and in particular to a method for detecting the matching degree of a high-frequency induction heating coil. Background Art

[0002] With the continuous improvement of industrial production requirements for heating efficiency, quality and automation, high-frequency induction heating technology has continued to develop. In high-frequency induction heating technology, the matching degree between the heating coil and the high-frequency power supply and matching circuit has a crucial impact on the heating efficiency and effect.

[0003] However, in the existing high-frequency induction heating technology, there are certain limitations in the detection method of the matching degree of the heating coil; the traditional method mainly focuses on parameters such as current, voltage, and impedance and current transfer coefficient calculated therefrom, but insufficient consideration is given to the influence of other factors. As a result, the current detection method of the matching degree of the high-frequency induction heating coil has defects such as large errors and insufficient accuracy. The inability to fully understand the status of the system will reduce the system's working efficiency and make it difficult to meet the needs of actual production. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a method for detecting the matching degree of a high-frequency induction heating coil. , output frequency f, variable resistance R, variable inductance L and number of turns of heating coil , from which the actual input current is calculated , actual output current , actual magnetic field strength and the actual voltage ; and further calculate the actual output index ; According to the actual output indicators Calculate the matching index of high-frequency induction heating coil It solves the problem of insufficient consideration of the impact of other factors on the system, can provide a more comprehensive understanding of the system status, improves the accuracy of the high-frequency induction heating coil matching detection method, and improves work efficiency; at the same time, it improves the defect of large error in the detection method to better meet the needs of actual production.

[0005] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for detecting the matching degree of a high-frequency induction heating coil, characterized in that it comprises the following steps: Step 1: Obtain the input voltage of the high frequency induction heating coil , output frequency f, variable resistance R, variable inductance L and number of turns of heating coil ; Step 2: According to the input voltage , output frequency , variable resistor and variable inductance Calculate the actual input current ; According to the number of turns of the heating coil and the actual input current Calculate the actual output current ; According to the actual output current and variable resistor Calculate the actual voltage ; According to the number of turns of the heating coil and the actual output current Calculate the actual magnetic field strength ; Through the actual input current , actual output current and the actual voltage Calculating Power Index ; Through the actual input current , actual output current , actual voltage and the actual magnetic field strength Calculation of magnetic field and current coupling indicators , and according to the power index and magnetic field and current coupling index Calculate the actual output index ; Step 3: Output indicators based on actual Calculate the matching index of high-frequency induction heating coil ; Step 4: Set the matching threshold set and set the matching index The matching level of the high-frequency induction heating coil is determined by comparing it with the matching level threshold set, and whether to trigger an alarm instruction is determined according to the matching level, and an alarm message is generated and released.

[0006] In the preferred embodiment of the above-mentioned method for detecting the matching degree of a high-frequency induction heating coil: calculating the actual input current The method is: According to input voltage , output frequency , variable resistor and variable inductance Calculate the actual input current , the formula is as follows:

[0007] in, is the error coefficient of the first current sensor; is the temperature coefficient of the first current sensor; The current operating temperature of the first current sensor; The first current sensor is calibrated for temperature.

[0008] In the preferred embodiment of the above-mentioned method for detecting the matching degree of a high-frequency induction heating coil: calculating the actual output current The method is: According to the number of turns of the heating coil and the actual input current Calculate the actual output current , the formula is as follows:

[0009] in, is the error coefficient of the second current sensor; is the temperature coefficient of the second current sensor; is the current operating temperature of the second current sensor; is the calibration temperature of the second current sensor.

[0010] In the preferred embodiment of the above-mentioned method for detecting the matching degree of a high-frequency induction heating coil: calculating the actual voltage The method is: According to the actual output current and variable resistor Calculate the actual voltage , the formula is as follows:

[0011] in, is the error coefficient of the voltage sensor; is the temperature coefficient of the voltage sensor; is the current operating temperature of the voltage sensor; is the calibration temperature of the voltage sensor.

[0012] In the preferred embodiment of the above-mentioned method for detecting the matching degree of a high-frequency induction heating coil: calculating the actual magnetic field strength The method is: According to the number of turns of the heating coil and the actual output current Calculate the actual magnetic field strength , the formula is as follows:

[0013] in, is the vacuum permeability; is the length of the heating coil; is the maximum error range of the magnetic field intensity sensor; is the minimum error range of the magnetic field intensity sensor; is the temperature coefficient of the magnetic field strength sensor; is the current operating temperature of the magnetic field strength sensor; is the calibration temperature of the magnetic field strength sensor; is the nonlinear characteristic coefficient of the magnetic field intensity sensor, and its value is between 2 and 3; is the current magnetic material state parameter; is the initial reference state parameter.

[0014] In the preferred embodiment of the above-mentioned method for detecting the matching degree of a high-frequency induction heating coil: calculating the power index The method is: According to the actual input current , actual output current IA2 and actual voltage Calculating Power Index , the formula is as follows:

[0015] in, is the error coefficient calculated for the input power; The error coefficient calculated for the output power; is the power supply angular frequency; is the equivalent inductance; is the equivalent resistance; is the load resistance; is the load inductance; is the power conversion factor.

[0016] In the preferred embodiment of the above-mentioned method for detecting the matching degree of a high-frequency induction heating coil: calculating the magnetic field and current coupling index The method is: According to the actual input current , actual output current IA2, actual voltage and the actual magnetic field strength Calculation of magnetic field and current coupling indicators , the formula is as follows:

[0017] in, Error coefficient calculated for coupling index; is the phase difference between the magnetic field and the current; is the coefficient related to the coupling characteristics.

[0018] In the preferred embodiment of the above-mentioned method for detecting the matching degree of a high-frequency induction heating coil: calculating the actual output index The method is: According to the power index and magnetic field and current coupling index Calculate the actual output index , the formula is as follows:

[0019] in, Power Index The weight coefficient ranges from 0.3 to 0.6, according to the power index The actual output index Determine the extent of impact; is the magnetic field and current coupling index The weight coefficient ranges from 0.4 to 0.7, according to the magnetic field and current coupling index. The actual output index The extent of the impact is determined; and .

[0020] In the preferred embodiment of the above-mentioned method for detecting the matching degree of the high-frequency induction heating coil: calculating the matching degree index of the high-frequency induction heating coil The method is: According to the actual output indicators , calculate the matching index of high-frequency induction heating coil , the formula is as follows:

[0021] in, It is the minimum value under normal operation of the high-frequency induction heating coil system; It is the maximum value under normal operation of the high-frequency induction heating coil system.

[0022] In the preferred embodiment of the above-mentioned method for detecting the matching degree of the high-frequency induction heating coil, the method for determining the matching degree level of the high-frequency induction heating coil and determining whether to trigger the alarm mechanism is: The matching threshold set includes high matching threshold, medium matching threshold and low matching threshold. Compare with the matching threshold set, the criteria are as follows:

[0023] When the matching level is a low level match, an alarm instruction is triggered, an alarm message is generated and the alarm message is released.

[0024] (III) Beneficial effects The present invention provides a method for detecting the matching degree of a high-frequency induction heating coil, which has the following beneficial effects: (1) By obtaining the input voltage of the high-frequency induction heating coil , output frequency f, variable resistance R, variable inductance L and number of turns of heating coil , which can fully understand the status of the system, avoid the singleness of data, and provide a basis for subsequent precise adjustment and optimization; (2) By calculating the actual input and output current, actual voltage and actual magnetic field strength, the working state of the high-frequency induction heating coil can be accurately grasped. The calculation of the power index and the magnetic field and current coupling index can comprehensively evaluate the performance, making the obtained data more realistic. Based on the index, the heating power can be optimized to improve efficiency, which is helpful for quality control and fault diagnosis, preventing quality defects caused by heating problems, and providing a quantitative basis for system matching. (3) According to the actual output indicators Calculate the matching index of high-frequency induction heating coil , can normalize the complex matching relationship between the high-frequency induction heating coil and the entire heating system, intuitively present its adaptation status, facilitate system design and integration, and quickly judge compatibility when replacing or selecting equipment to avoid problems caused by mismatch; (4) By setting a matching threshold set and comparing it with the matching index By comparison, we can clearly understand the matching status of the coil and the system, which helps to quickly determine whether the current working status is normal. The alarm command is triggered according to the matching level, and automatic fault warning is realized. The alarm information can be generated and released in time, so that maintenance personnel can respond quickly. This reduces the risk of equipment damage, energy waste and production interruption caused by poor matching, ensures the continuity and stability of the production process, and improves the reliability and safety of the entire high-frequency induction heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a schematic diagram of the working steps of a method for detecting the matching degree of a high-frequency induction heating coil according to the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1The present invention provides a method for detecting the matching degree of a high-frequency induction heating coil, comprising the following steps: Step 1: Obtain the input voltage of the high frequency induction heating coil , output frequency f, variable resistance R, variable inductance L and number of turns of heating coil .

[0028] When using, combine the content of step 1: By obtaining the input voltage of the high-frequency induction heating coil , output frequency f, variable resistance R, variable inductance L and number of turns of heating coil , which can fully understand the status of the system, avoid the singleness of data, and provide a basis for subsequent precise adjustment and optimization.

[0029] Step 2: According to the input voltage , output frequency , variable resistor and variable inductance Calculate the actual input current ; According to the number of turns of the heating coil and the actual input current Calculate the actual output current ; According to the actual output current and variable resistor Calculate the actual voltage ; According to the number of turns of the heating coil and the actual output current Calculate the actual magnetic field strength ; Through the actual input current , actual output current and the actual voltage Calculating Power Index ; Through the actual input current , actual output current , actual voltage and the actual magnetic field strength Calculation of magnetic field and current coupling indicators , and according to the power index and magnetic field and current coupling index Calculate the actual output index ; Step 2 includes the following: Step 201: Calculate the actual input current The method is: According to input voltage , output frequency , variable resistor and variable inductance Calculate the actual input current , the formula is as follows:

[0030] in, is the error coefficient of the first current sensor, and its value range is usually between 0.01 and 0.1; is the temperature coefficient of the first current sensor, and its value range is between -0.001℃ and 0.001℃; The current operating temperature of the first current sensor; calibrating temperature for the first current sensor; It should be noted that the principle of this formula is: by considering the input voltage , output frequency , variable resistor and variable inductance The influence of factors such as the current on the current is added to the error coefficient of the first current sensor and temperature coefficient And the current operating temperature and calibration temperature These factors are used to correct the measurement error caused by the characteristics of the sensor itself; input voltage Directly affects the magnitude of the current. At the position of the numerator, it is proportional to the calculated current. The input voltage Obtained by measuring the voltage sensor; the error coefficient of the first current sensor Used to correct the measured value, provided by the manufacturer of the first current sensor; denominator By affecting the impedance, the current is indirectly affected. Obtained by a resistance measuring instrument; variable inductance Obtained by inductance measuring instrument; output frequency The output frequency of the circuit is measured by a frequency meter; The influence of temperature on sensor measurement is taken into account to correct the current value, temperature coefficient Provided by a manufacturer of the first current sensor; is the calibration temperature of the first current sensor determined during factory calibration; The current operating temperature of the first current sensor is measured by the temperature sensor.

[0031] Step 202: Calculate the actual output current The method is: According to the number of turns of the heating coil and the actual input current Calculate the actual output current , the formula is as follows:

[0032] in, is the error coefficient of the second current sensor, and its value range is between 0.01 and 0.1; is the temperature coefficient of the second current sensor, ranging from -0.001°C to 0.001°C; is the current operating temperature of the second current sensor; is the calibration temperature of the second current sensor; It should be noted that the principle of this formula is: the number of turns of the heating coil and the actual input current Calculate the actual output current , adding the error coefficient of the second current sensor and temperature coefficient And the current operating temperature and calibration temperature , used to correct the measurement error caused by the characteristics of the sensor itself; the number of turns of the heating coil The larger the actual output current The greater the influence, the error coefficient of the second current sensor is obtained by directly counting the number of turns of the heating coil. Provided by the manufacturer of the second current sensor and used to correct the current measurement; temperature coefficient Used to describe how the characteristics of the sensor change with temperature, provided by the manufacturer of the second current sensor; current operating temperature The current operating temperature of the second current sensor is measured by the temperature sensor; the calibration temperature It is determined by the calibration temperature of the second current sensor during factory calibration.

[0033] Step 203: Calculate the actual voltage The method is: According to the actual output current and variable resistor Calculate the actual voltage , the formula is as follows:

[0034] in, is the error coefficient of the voltage sensor, ranging from 0.01 to 0.1; is the temperature coefficient of the voltage sensor, ranging from -0.001℃ to 0.001℃; is the current operating temperature of the voltage sensor; is the calibration temperature of the voltage sensor.

[0035] It should be noted that the principle of this formula is: through the actual output current Multiply by the voltage sensor error factor Multiply the effect of temperature on the sensor by the variable resistance Get the actual voltage , by correcting the voltage sensor, the actual voltage can be obtained more accurately ; Error coefficient of voltage sensor Provided by the voltage sensor manufacturer; the temperature coefficient of the voltage sensor Provided by the voltage sensor manufacturer; the current operating temperature of the voltage sensor The current working temperature of the voltage sensor is measured by the temperature sensor; the calibration temperature of the voltage sensor Determined by the calibration temperature of the voltage sensor during factory calibration.

[0036] Step 204: Calculate the actual magnetic field strength The method is: According to the number of turns of the heating coil and the actual output current Calculate the actual magnetic field strength , the formula is as follows:

[0037] in, is the vacuum permeability; is the length of the heating coil; is the maximum error range of the magnetic field intensity sensor; is the minimum error range of the magnetic field intensity sensor; is the temperature coefficient of the magnetic field intensity sensor, ranging from -0.001℃ to 0.001℃; is the current operating temperature of the magnetic field strength sensor; is the calibration temperature of the magnetic field strength sensor; is the nonlinear characteristic coefficient of the magnetic field intensity sensor, and its value is between 2 and 3; is the current magnetic material state parameter; is the initial reference state parameter; It should be noted that the principle of this formula is: is to calculate the actual magnetic field strength The basic formula of vacuum magnetic permeability Is a basic physical constant and can be directly quoted; the length of the heating coil The length of the heating coil is directly measured by a measuring tool; Used to correct the measurement error of the magnetic field strength sensor, so that the calculation result is closer to the actual magnetic field strength and reduce the inaccuracy caused by sensor error; the maximum error range of the magnetic field strength sensor And the minimum error range of the magnetic field strength sensor Obtained from the sensor's product manual; It is used to correct the effect of temperature on the measurement of the magnetic field strength sensor; the temperature coefficient of the magnetic field strength sensor Obtained through the sensor's technical data; the current working temperature of the magnetic field strength sensor Measured by a temperature sensor installed near the magnetic field strength sensor; the calibration temperature of the magnetic field strength sensor Determined by the calibration temperature of the magnetic field strength sensor at the factory; Consider the influence of magnetic material state change on magnetic field strength; nonlinear characteristic coefficient of magnetic field strength sensor Determined by the sensor's technical specifications; current magnetic material state parameters Measured according to the current state of the magnetic material; initial reference state parameters Determined during the initial calibration phase of equipment installation.

[0038] Step 205: Calculate power index The method is: According to the actual input current , actual output current and the actual voltage Calculating Power Index , the formula is as follows:

[0039] in, is the error coefficient of input power calculation, ranging from 0.01 to 0.1; is the error coefficient of output power calculation, ranging from 0.01 to 0.1; is the power supply angular frequency; is the equivalent inductance; is the equivalent resistance; is the load resistance; is the load inductance; is the power conversion coefficient, and its value is between 0.1 and 0.2.

[0040] It should be noted that the principle of this formula is: taking into account the actual input current , actual output current and the actual voltage , as well as various error coefficients and circuit parameters related to power calculation, can more accurately obtain the power conversion situation under the influence of various practical factors; the numerator Indicates that it is related to output power; load resistance The error coefficient of the output power calculation is obtained by measuring the load resistance with a resistance measuring instrument. Provided by relevant equipment manufacturers; load inductance The denominator is obtained by measuring the load inductance with an inductance measuring instrument; Mainly related to input power; error coefficient of input power calculation Provided by relevant equipment manufacturers; equivalent resistance and equivalent inductance Measured by circuit; power conversion factor Provided by relevant equipment manufacturers.

[0041] Step 206: Calculate magnetic field and current coupling index The method is: According to the actual input current , actual output current IA2, actual voltage and the actual magnetic field strength Calculation of magnetic field and current coupling indicators , the formula is as follows:

[0042] in, is the error coefficient of coupling index calculation, ranging from 0.2 to 0.4; is the phase difference between the magnetic field and the current; It is a coefficient related to the coupling characteristics, and its value is between 0.01 and 0.2.

[0043] It should be noted that the principle of this formula is: It is the basic part to measure the coupling between magnetic field and current. The greater the magnetic field strength and the greater the output current, the greater the value of this part will be, which will increase the coupling index. It is the product of the actual input current and the actual voltage. The ratio to the numerator determines the size of the coupling index. The larger the input current and voltage, the larger the denominator, which will reduce the coupling index. The error coefficient calculated by adding the coupling index , Phase difference and coupling characteristic correlation coefficient This part of the calculation is corrected, so that the magnetic field and current coupling index are obtained. More realistic; error coefficient for coupling index calculation Provided by the manufacturer of the relevant equipment; coefficients related to coupling characteristics Provided by relevant equipment manufacturers.

[0044] Step 207: Calculate actual output index The method is: According to the power index and magnetic field and current coupling index Calculate the actual output index , the formula is as follows:

[0045] in, Power Index The weight coefficient ranges from 0.3 to 0.6, according to the power index The actual output index Determine the extent of impact; is the magnetic field and current coupling index The weight coefficient ranges from 0.4 to 0.7, according to the magnetic field and current coupling index. The actual output index The extent of the impact is determined; and .

[0046] It should be noted that the principle of this formula is: the actual output index It is an indicator for comprehensively evaluating the performance of high-frequency induction heating system; weight coefficient With power index Multiply and add the weight factor Coupling index with magnetic field and current Multiply to get the actual output index , ensuring the rationality and normalization of the calculation.

[0047] When used, combine the contents of step 201 to step 207: By calculating the actual input and output current, actual voltage and actual magnetic field strength, the working state of the high-frequency induction heating coil can be accurately grasped. The calculation of the power index and the magnetic field and current coupling index can comprehensively evaluate the performance, making the obtained data more realistic. Based on the index, the heating power can be optimized to improve efficiency, which is helpful for quality control and fault diagnosis, preventing quality defects caused by heating problems, and providing a quantitative basis for system matching.

[0048] Step 3: Output indicators based on actual Calculate the matching index of high-frequency induction heating coil , the specific steps include: Step 301: Calculate the matching index of the high-frequency induction heating coil The method is: According to the actual output indicators , calculate the matching index of high-frequency induction heating coil , the formula is as follows:

[0049] in, It is the minimum value under normal operation of the high-frequency induction heating coil system; It is the maximum value under normal operation of the high-frequency induction heating coil system.

[0050] It should be noted that the principle of this formula is: by converting the actual output index The matching index of the high-frequency induction heating coil is calculated by comparing the minimum and maximum values ​​of the high-frequency induction heating coil system under normal operation. , a normalized method is used to intuitively compare the matching degree of different high-frequency induction heating coils under different working conditions; the minimum value of the high-frequency induction heating coil system under normal operation and the maximum value under normal operation of the high-frequency induction heating coil system It is obtained through multiple experimental data.

[0051] When used, combine the content of step 301: By outputting indicators based on actual Calculate the matching index of high-frequency induction heating coil It can normalize the complex matching relationship between the high-frequency induction heating coil and the entire heating system, intuitively present its adaptation status, facilitate system design and integration, and quickly judge compatibility when replacing or selecting equipment to avoid problems caused by mismatch.

[0052] Step 4: Set the matching threshold set and set the matching index Compare with the matching threshold set to determine the matching level of the high-frequency induction heating coil, determine whether to trigger an alarm instruction according to the matching level, generate alarm information and publish the alarm information. The specific steps include: Step 401: The method of determining the matching level of the high-frequency induction heating coil and determining whether to trigger the alarm mechanism is as follows: The matching threshold set includes high matching threshold, medium matching threshold and low matching threshold. Compare with the matching threshold set, the criteria are as follows:

[0053] When the matching level is a low level match, the alarm instruction is triggered, the alarm information is generated and released; It should be noted that the matching threshold set is set by referring to relevant technical documents and is based on the matching index. The matching level of the high-frequency induction heating coil is determined by comparing the matching level with the matching level threshold set.

[0054] When used, combined with the content of step 401: By setting the matching threshold set and matching index By comparing, we can clearly understand the matching status of the coil and the system, which helps to quickly determine whether the current working status is normal. According to the matching level, the alarm command is triggered, and the automatic early warning of the fault is realized. The alarm information can be generated and released in time, so that the maintenance personnel can respond quickly. This reduces the risk of equipment damage, energy waste and production interruption caused by poor matching, ensures the continuity and stability of the production process, and improves the reliability and safety of the entire high-frequency induction heating system.

[0055] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product. A person of ordinary skill in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented in electronic hardware or in combination with computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution.

[0056] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0057] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A method for detecting the matching degree of a high-frequency induction heating coil, characterized in that: The following steps are involved: Step 1: Obtain the input voltage of the high frequency induction heating coil , output frequency f, variable resistance R, variable inductance L and number of turns of heating coil ; Step 2: According to the input voltage , output frequency , variable resistor and variable inductance Calculate the actual input current ; According to the number of turns of the heating coil and the actual input current Calculate the actual output current ; According to the actual output current and variable resistor Calculate the actual voltage ; According to the number of turns of the heating coil and the actual output current Calculate the actual magnetic field strength ; Through the actual input current , actual output current and the actual voltage Calculating Power Index ; Through the actual input current , actual output current , actual voltage and the actual magnetic field strength Calculation of magnetic field and current coupling indicators , and according to the power index and magnetic field and current coupling index Calculate the actual output index ; Step 3: Output indicators based on actual Calculate the matching index of high-frequency induction heating coil ; Step 4: Set the matching threshold set and set the matching index The matching level of the high-frequency induction heating coil is determined by comparing it with the matching level threshold set, and whether to trigger an alarm instruction is determined according to the matching level, and an alarm message is generated and released.

2. A method for detecting matching degree of a high-frequency induction heating coil according to claim 1, characterized in that: Calculate the actual input current The method is: According to input voltage , output frequency , variable resistor and variable inductance Calculate the actual input current , the formula is as follows: in, is the error coefficient of the first current sensor; is the temperature coefficient of the first current sensor; The current operating temperature of the first current sensor; The first current sensor is calibrated for temperature.

3. A method for detecting matching degree of a high-frequency induction heating coil according to claim 2, characterized in that: Calculate the actual output current The method is: According to the number of turns of the heating coil and the actual input current Calculate the actual output current , the formula is as follows: in, is the error coefficient of the second current sensor; is the temperature coefficient of the second current sensor; is the current operating temperature of the second current sensor; is the calibration temperature of the second current sensor.

4. A method for detecting matching degree of a high-frequency induction heating coil according to claim 3, characterized in that: Calculate the actual voltage The method is: According to the actual output current and variable resistor Calculate the actual voltage , the formula is as follows: in, is the error coefficient of the voltage sensor; is the temperature coefficient of the voltage sensor; is the current operating temperature of the voltage sensor; is the calibration temperature of the voltage sensor.

5. A method for detecting matching degree of a high-frequency induction heating coil according to claim 4, characterized in that: Calculate the actual magnetic field strength The method is: According to the number of turns of the heating coil and the actual output current Calculate the actual magnetic field strength , the formula is as follows: in, is the vacuum permeability; is the length of the heating coil; is the maximum error range of the magnetic field intensity sensor; is the minimum error range of the magnetic field intensity sensor; is the temperature coefficient of the magnetic field strength sensor; is the current operating temperature of the magnetic field strength sensor; is the calibration temperature of the magnetic field strength sensor; is the nonlinear characteristic coefficient of the magnetic field intensity sensor, and its value is between 2 and 3; is the current magnetic material state parameter; is the initial reference state parameter.

6. A method for detecting matching degree of a high-frequency induction heating coil according to claim 5, characterized in that: Calculating Power Index The method is: According to the actual input current , actual output current IA2 and actual voltage Calculating Power Index , the formula is as follows: in, is the error coefficient calculated for the input power; is the error coefficient of output power calculation, ranging from 0.01 to 0.1; is the power supply angular frequency; is the equivalent inductance; is the equivalent resistance; is the load resistance; is the load inductance; is the power conversion factor.

7. A method for detecting matching degree of a high-frequency induction heating coil according to claim 6, characterized in that: Calculation of magnetic field and current coupling indicators The method is: According to the actual input current , actual output current IA2, actual voltage and the actual magnetic field strength Calculation of magnetic field and current coupling indicators , the formula is as follows: in, Error coefficient calculated for coupling index; is the phase difference between the magnetic field and the current; is the coefficient related to the coupling characteristics.

8. A method for detecting matching degree of a high-frequency induction heating coil according to claim 7, characterized in that: Calculate the actual output index The method is: According to the power index and magnetic field and current coupling index Calculate the actual output index , the formula is as follows: in, Power Index The weight coefficient ranges from 0.3 to 0.6, according to the power index The actual output index Determine the extent of impact; is the magnetic field and current coupling index The weight coefficient ranges from 0.4 to 0.7, according to the magnetic field and current coupling index. The actual output index The extent of the impact is determined; and .

9. A method for detecting matching degree of a high-frequency induction heating coil according to claim 8, characterized in that: Calculate the matching index of high-frequency induction heating coil The method is: According to the actual output indicators , calculate the matching index of high-frequency induction heating coil , the formula is as follows: in, It is the minimum value under normal operation of the high-frequency induction heating coil system; It is the maximum value under normal operation of the high-frequency induction heating coil system.

10. A method for detecting matching degree of a high-frequency induction heating coil according to claim 9, characterized in that: The method for determining the matching level of the high-frequency induction heating coil and determining whether to trigger the alarm mechanism is: The matching threshold set includes high matching threshold, medium matching threshold and low matching threshold. Compare with the matching threshold set, the criteria are as follows: When the matching level is a low level match, an alarm instruction is triggered, an alarm message is generated and the alarm message is released.

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