A microwave heating furnace power control and flattening method

Abstract

The application provides a microwave heating furnace power control and flattening method, and belongs to the technical field of power control. The method comprises the following steps: when the microwave heating furnace is in a heating state, the actual characteristic curve of a magnetron in the heating state is captured and compared with the standard characteristic curve in the corresponding heating gear to determine a gear failure factor; when the gear failure factor is 0, the microwave heating furnace in the corresponding gear continues to work according to a first power; when the gear failure factor is not 0, an adjustment instruction is obtained from a factor-gear-adjustment mapping table, and the magnetron is automatically adjusted according to the adjustment instruction to control the microwave heating furnace to work according to a second power. Through real-time monitoring of the working state of the microwave heating furnace, the working power is adjusted in a timely manner, and the effective control of the working power of the microwave heating furnace is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power control, in particular to a microwave heating furnace power control and flattening method. BACKGROUND

[0002] The microwave heating furnace is an electric appliance for heating objects by using microwave waves, which is composed of a power transformer, a magnetron, a furnace cavity, a furnace door, a timer and a time-power controller. The magnetron is used to control the output power of the microwave heating furnace and is the core component of the microwave heating furnace.

[0003] Due to the influence of the characteristics of different components and the working environment of the components, even the same specifications and models of microwave heating furnaces cannot guarantee the consistency of the output power or the input power with the gear position. In this process, the power may be too low or too high, especially after the gear position is damaged, the power of the microwave heating furnace cannot be well controlled. Therefore, it is particularly important to accurately control the power to ensure the use effect of the microwave heating furnace.

[0004] Therefore, the present application provides a microwave heating furnace power control and flattening method. SUMMARY

[0005] The present application provides a microwave heating furnace power control and flattening method, which determines the gear failure factor by comparing the difference between the characteristic curves, adjusts the magnetron according to the value of the gear failure factor, and then adjusts the working power of the microwave heating furnace, so as to realize accurate control and flattening of the power of the microwave heating furnace and ensure the use effect of the microwave heating furnace.

[0006] The present application provides a microwave heating furnace power control and flattening method, which includes:

[0007] Step 1: When the microwave heating furnace is in a heating state, the actual characteristic curve of the magnetron in the heating state is captured, and compared with the standard characteristic curve under the corresponding heating gear position to determine the gear failure factor;

[0008] Step 2: When the gear failure factor is 0, the microwave heating furnace under the corresponding gear position continues to work according to the first power;

[0009] Step 3: When the gear failure factor is not 0, the adjustment instruction is obtained from the factor-gear-adjustment mapping table, and the magnetron is automatically adjusted according to the adjustment instruction to control the microwave heating furnace to work according to the second power.

[0010] In one possible implementation, when the microwave heating furnace is in a heating state, the actual characteristic curve of the magnetron in the heating state is captured, including:

[0011] The microwave heating furnace is powered on and in a heating state;

[0012] The power detection circuit is established to monitor the input voltage and input current of the magnetron of the microwave heating furnace in real time to obtain real-time input power;

[0013] Based on the real-time input power and the microwave heating furnace heating time, the actual characteristic curve of the magnetron in the heating state is established.

[0014] In one possible implementation, before the power detection circuit is established to monitor the input voltage and input current of the magnetron of the microwave heating furnace in real time to obtain real-time input power, the power detection circuit is qualified verified, specifically including:

[0015] A number of test currents are input to the power detection circuit from small to large to construct a test vector of each detection element in the power detection circuit and construct a test matrix, wherein the test matrix has n1 columns and n2 rows, and n2 represents the number of test currents, and n1 represents the number of detection elements, and each detection element includes three test results, namely current, voltage and resistance;

[0016] According to the element test relationship determined according to the circuit setting structure of the power detection circuit, each row test vector in the test matrix is subjected to first reasonable analysis;

[0017]

[0018] Wherein, H1 represents the first reasonable analysis value of the corresponding row test vector; n1 represents the number of detection elements in the power detection circuit; ∝ i,i1 represents the voltage weight corresponding to the i1th detection element; u0 i1 represents the standard voltage of the i1th detection element under the corresponding test current determined based on the element test relationship; u i1 represents the actual voltage of the i1th detection element under the corresponding test current; i0 i1 represents the standard current of the i1th detection element under the corresponding test current determined based on the element test relationship; i i1 represents the actual current of the i1th detection element under the corresponding test current; ∝ i,i1 represents the current weight corresponding to the i1th detection element; r0 i1 represents the standard resistance of the i1th detection element under the corresponding test current determined based on the element test relationship; r i1 represents the actual resistance of the i1th detection element under the corresponding test current; ∝ r,i1 represents the resistance weight corresponding to the i1th detection element; represents the maximum value obtained from all represents the maximum value obtained from all represents the maximum value obtained from all represents the maximum value obtained from all represents the maximum value obtained from all represents the maximum value obtained from all

[0019] performing a first fitting on all voltages, a second fitting on all currents and a third fitting on all resistances in each column of the test matrix;

[0020] comparing the first fitting result, the second fitting result and the third fitting result with corresponding standard fitting results caused by the current size relationship of the detection element based on the test current respectively;

[0021] obtaining a first fitting difference of the first fitting result, a second fitting difference of the second fitting result and a third fitting difference of the third fitting result respectively, and inputting them into an abnormality analysis model to obtain a second reasonable analysis value corresponding to the detection element;

[0022] when all the first reasonable analysis values and all the second reasonable analysis values meet the detection standard, determining that the power detection circuit is qualified;

[0023] otherwise, extracting the first abnormal value and the second abnormal value that do not meet the detection standard;

[0024] and inputting all the first abnormal value and the second abnormal value into a value analysis model to determine the abnormal element and the abnormal line segment of the power detection circuit;

[0025] replacing the abnormal element and the abnormal line segment to obtain a qualified power detection circuit.

[0026] In a possible implementation, the comparison with the standard characteristic curve under the corresponding heating gear is used to determine a gear failure factor, including:

[0027] aligning the actual characteristic curve and the standard characteristic curve according to the heating attribute of the microwave heating furnace in time, and obtaining a first distance between a first point on the actual characteristic curve and a second point on the standard characteristic curve at the same time point respectively;

[0028] averaging all the first distances to obtain a distance average value

[0029] if then determining that the failure factor is 1, wherein D1' is the first standard average value;

[0030] if determining the failure factor as 0, wherein D2' is a second standard average value, wherein the first standard average value is greater than the second standard average value;

[0031] Otherwise, determining the fluctuation range of the input power through the standard characteristic curve, and comparing the power value corresponding to each time point on the actual characteristic curve with the fluctuation range of the standard characteristic curve:

[0032]

[0033]

[0034] wherein S1 n represents the final failure coefficient of the power value of the nth time point on the actual characteristic curve; P min represents the minimum power value of the fluctuation range, P max represents the maximum power value of the fluctuation range, and [P min , P max ] is the fluctuation range of the standard input power; S1 is the gear sub-failure factor corresponding to the nth time point on the actual characteristic curve, is the failure coefficient corresponding to the nth time point on the actual characteristic curve when the power value is less than P min is the failure coefficient corresponding to the nth time point on the actual characteristic curve when the power value is greater than P max ; S0 represents the gear failure factor of the actual characteristic curve; P' n represents the corresponding preset power threshold; (S1 n1 ) max represents the maximum factor of the gear sub-failure factors at the N1 time points in the stable stage on the actual characteristic curve; (S1 n1 ) min represents the minimum factor of the gear sub-failure factors at the N1 time points in the stable stage on the actual characteristic curve; S1 n1 represents the gear sub-failure factor at the n1th time point in the stable stage on the actual characteristic curve. represents the fine tuning function, and the fine tuning factor of the fine tuning function is obtained based on a function mapping table, and the value range of the fine tuning factor is [0, 0.1].

[0035] In a possible implementation manner, before comparing the power value corresponding to each time point on the actual characteristic curve with the fluctuation range of the standard characteristic curve, the method further includes: determining the fluctuation range of the standard characteristic curve, and specifically includes:

[0036]

[0037] ​

[0038] Pn = P0 * (1 + (n-1) * (Pmax-Pmin) / (N-1) ) wherein P n Pn represents the standard power value at the nth time point on the standard characteristic curve; N represents the number of time points existing on the standard characteristic curve, and is consistent with the number of time points on the actual characteristic curve; P0 min Pn represents the minimum original power value in the stable stage of the standard fluctuation curve, P0 max Pn represents the maximum original power value in the stable stage of the standard fluctuation curve.

[0039] In a possible implementation, when the gear failure factor is not 0, the adjustment instruction is obtained from the factor-gear-adjustment mapping table, including:

[0040] Obtaining the set gear of the microwave heating furnace and the gear failure factor;

[0041] Matching the set gear, the gear failure factor and the factor-gear-adjustment mapping table to obtain the adjustment instruction.

[0042] In a possible implementation, the process of controlling the microwave heating furnace to work at the second power further includes:

[0043] Adjusting the duty cycle of the pulse width signal generated by the microwave heating furnace microcontroller based on the adjustment instruction to obtain an adjusted duty cycle;

[0044] Generating frequency adjustment information based on the duty cycle, and adjusting the frequency conversion frequency of the microwave heating furnace based on the frequency adjustment information to obtain an adjusted frequency conversion frequency;

[0045] Adjusting the output power of the magnetron based on the adjusted frequency conversion frequency and the frequency-output power relationship mapping table to obtain the second power;

[0046] Controlling the microwave heating furnace to work at the second power.

[0047] In a possible implementation, adjusting the duty cycle of the pulse width signal generated by the microwave heating furnace microcontroller based on the adjustment instruction to obtain an adjusted duty cycle includes:

[0048] Obtaining the theoretical input power value corresponding to different gears of the microwave heating furnace from the gear-power mapping table, that is, the first power, and obtaining the first duty cycle based on the preset power-duty cycle mapping table;

[0049] Comparing the second power with the first power to obtain a power difference value;

[0050] P = P2-P1

[0051] Wherein, P is a power difference value, P2 is a second power, and P1 is a first power.

[0052] Adjusting a duty cycle based on the power difference value to obtain a second duty cycle.

[0053] Other features and advantages of the present application will be set forth in the following specification, and in part will become apparent to those skilled in the art upon exercise of the imagination and practice of the application. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0054] The technical solutions of the present application are described in further detail below with the aid of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0055] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and are used to explain the present application, but do not constitute a limitation on the present application. In the drawings:

[0056] Figure 1 A flow chart of a microwave heating furnace power control and flattening method in an embodiment of the present application;

[0057] Figure 2 A microwave heating furnace structure diagram in a microwave heating furnace power control and flattening method in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and do not constitute a limitation on the present application.

[0059] The embodiment of the present application provides a microwave heating furnace power control and flattening method, as shown in Figure 1 The method comprises the following steps:

[0060] Step 1: When the microwave heating furnace is in a heating state, the actual characteristic curve of the magnetron in the heating state is captured and compared with the standard characteristic curve in the corresponding heating gear to determine a gear failure factor;

[0061] Step 2: When the gear failure factor is 0, the microwave heating furnace in the corresponding gear continues to work according to a first power;

[0062] Step 3: When the gear failure factor is not 0, an adjustment instruction is obtained from a factor-gear-adjustment mapping table, and the magnetron is automatically adjusted according to the adjustment instruction to control the microwave heating furnace to work according to a second power.

[0063] In this embodiment, the microwave heating furnace refers to a household or industrial electrical appliance that uses microwave band electromagnetic waves to heat objects, which is composed of a power supply, a magnetron, a control circuit, and a cooking cavity. Near the entrance of the cooking cavity, there is a rotatable stirrer made of metal in the shape of a fan. When it rotates, it can reflect microwaves in all directions, so that microwave energy is evenly distributed in the cooking cavity, thereby achieving heating of food. Specifically as shown in Figure 2

[0064] In this embodiment, the magnetron, also known as a microwave generator, is an electric vacuum device used to generate microwave energy. It is essentially a diode placed in a constant magnetic field. The electrons in the tube are controlled by a constant magnetic field and a constant electric field, which interact with high-frequency electromagnetic fields to convert the energy obtained from the constant electric field into microwave energy, thereby achieving the purpose of generating microwave energy. The magnetron is the core component of the microwave heating furnace, and its service life determines the service life of the microwave heating furnace.

[0065] In this embodiment, the heating state refers to the condition in which the microwave heating furnace can heat food to a certain temperature.

[0066] In this embodiment, the actual characteristic curve refers to the characteristic curve reflecting the relationship between the real-time input power of the microwave heating furnace and the microwave heating time. The standard characteristic curve refers to the characteristic curve reflecting the relationship between the standard input power of the microwave heating furnace and the microwave heating time. The characteristic curve also includes the current, voltage, power, and resistance of the working devices involved in the microwave heating furnace, and the actual curves and standard curves of the four parameters changing with time.

[0067] In this embodiment, the heating gear can be used to adjust the working power of the microwave heating furnace. For example, gear 1 is 100 watts, gear 2 is 200 watts, and so on.

[0068] In this embodiment, the microwave heating furnace may have different actual input power and standard input power during operation. In order to show the difference between the actual input power and the standard input power under different working gears, a gear failure factor is designed, which is the difference between the actual and standard power, voltage, resistance, and current. There may be a gear failure factor, and the value range of the gear failure factor is [0, 1].

[0069] In this embodiment, the first power refers to the standard working power corresponding to the working gear of the microwave heating furnace.

[0070] In this embodiment, the factor-gear-adjustment mapping table can reflect different adjustment instructions corresponding to different gears and different gear failure factors.

[0071] ​In the embodiment, the working power of the microwave heating furnace can be adjusted according to different adjustment instructions, and the working power conforming to the real-time input power can be obtained.

[0072] In the embodiment, the second power refers to the working power of the microwave heating furnace obtained by adjusting the first power through the adjustment instruction.

[0073] The beneficial effects of the above technical solution are that: through real-time monitoring of the microwave heating furnace in the heating state, the real-time working power of the microwave heating furnace can be obtained in time, the actual characteristic curve of the microwave heating furnace can be captured, and the gear failure factor can be obtained in time by comparing the actual characteristic curve with the standard characteristic curve, the accurate adjustment instruction can be obtained by comparing the gear failure factor, the working power of the microwave heating furnace can be adjusted through the adjustment instruction, and the working power of the microwave heating furnace can be effectively controlled.

[0074] The embodiment of the application provides a microwave heating furnace power control and flattening method, when the microwave heating furnace is in a heating state, the actual characteristic curve of a magnetron in the heating state is captured, comprising:

[0075] The microwave heating furnace is connected to a power supply, and the microwave heating furnace is in a heating state;

[0076] A power detection circuit is established to monitor the input voltage and input current of the magnetron of the microwave heating furnace in real time, and obtain a real-time input power;

[0077] An actual characteristic curve of the magnetron in the heating state is established based on the real-time input power and the heating time of the microwave heating furnace.

[0078] In the embodiment, the power detection circuit comprises a voltage detection circuit and a current detection circuit, real-time voltage values and real-time current values are obtained through the voltage detection circuit and the current detection circuit, and the real-time input power is obtained through a power calculation formula.

[0079] In the embodiment, the actual characteristic curve is constituted by the relationship between the real-time input power and the heating time of the microwave heating furnace, and reflects the relationship between power and time, wherein the curve corresponding to the power can be one of the characteristics.

[0080] The beneficial effects of the above technical solution are that: through real-time monitoring of the input power, the actual characteristic curve can be obtained, the actual working condition can be intuitively and effectively reflected, and the accuracy of the gear failure factor captured subsequently is effectively guaranteed.

[0081] The embodiment of the present application provides a kind of microwave heating furnace power control and flattening method, establishes power detection circuit to the input voltage and input current of magnetron of microwave heating furnace real-time monitoring, obtain real-time input power before, including: the qualified verification of the power detection circuit, specifically including:

[0082] Input several test currents from small to large to the power detection circuit, construct the test vector of each detection element in the power detection circuit, and construct test matrix, wherein the test matrix n1 column n2 row, and n2 indicates the number of test currents, n1 indicates the number of detection elements, and each detection element contains three test results, current, voltage and resistance respectively;

[0083] According to the element test relationship determined according to the circuit setting structure of the power detection circuit, first reasonable analysis is carried out on each row test vector in the test matrix;

[0084]

[0085] Wherein, H1 indicates the first reasonable analysis value of the corresponding row test vector;n1 indicates the number of detection elements in the power detection circuit;∝ u,i1 Indicates the voltage weight corresponding to the i1th detection element;u0 i1 Indicates the standard voltage of the i1th detection element under the corresponding test current determined based on element test relationship;u i1 Indicates the actual voltage of the i1th detection element under the corresponding test current;i0 i1 Indicates the standard current of the i1th detection element under the corresponding test current determined based on element test relationship;i i1 Indicates the actual current of the i1th detection element under the corresponding test current;∝ i,i1 Indicates the current weight corresponding to the i1th detection element;r0 i1 Indicates the standard resistance of the i1th detection element under the corresponding test current determined based on element test relationship;r i1 Indicates the actual resistance of the i1th detection element under the corresponding test current;∝ r,i1 Indicates the resistance weight corresponding to the i1th detection element; Indicates the maximum value obtained from all Indicates the maximum value obtained from all Indicates the maximum value obtained from all Indicates the maximum value obtained from all Indicates the maximum value obtained from all Indicates the maximum value obtained from all

[0086] First fitting is carried out on all voltages in each column test vector in test matrix, second fitting is carried out on all currents, and third fitting is carried out on all resistances.

[0087] comparing the first fitting result, the second fitting result and the third fitting result with corresponding standard fitting results brought by the current size relationship of the detection element based on the test current respectively;

[0088] respectively obtaining a first fitting difference of the first fitting result, a second fitting difference of the second fitting result and a third fitting difference of the third fitting result, and inputting them into an abnormality analysis model to obtain a second reasonable analysis value corresponding to the detection element;

[0089] When all the first reasonable analysis values and all the second reasonable analysis values meet the detection standard, it is determined that the power detection circuit is qualified;

[0090] Otherwise, the first abnormal value and the second abnormal value that do not meet the detection standard are extracted;

[0091] And input all the first abnormal value and the second abnormal value into the value analysis model to determine the abnormal element and the abnormal line segment of the power detection circuit;

[0092] Replace the abnormal element and the abnormal line segment to obtain a qualified power detection circuit.

[0093] In this embodiment, the test vector of each detection element includes a vector composed of the voltage, current and resistance obtained by multiple detections of each detection element.

[0094] In this embodiment, the first reasonable analysis refers to real-time measurement of the voltage, current and resistance of each detection element in the detection circuit, comparison of the measurement results with standard results, obtaining of comparison results, and analysis and calculation of the comparison results according to different weights to obtain the first reasonable analysis value. The weights are pre-set, and the weights of the current, voltage and resistance corresponding to different detection elements are different, but are pre-set, mainly for convenient calculation.

[0095] In this embodiment, the first fitting result, the second fitting result and the third fitting result are actually fitting curves corresponding to the voltage, current and resistance, and the standard fitting result is a standard curve corresponding to the current, voltage and resistance.

[0096] In this embodiment, the abnormality analysis model is a pre-set model, which is obtained by training a neural network model based on the difference results of the test curves of each detection element under different test currents and the analysis values corresponding to different abnormal combinations. The abnormality analysis model can analyze the corresponding difference results of the fitting results to obtain the second reasonable analysis value of the corresponding element.

[0097] In this embodiment, the first fitting difference, the second fitting difference and the third fitting difference refer to the difference obtained by comparing the curves of the first fitting result, the second fitting result, the third fitting result and the standard fitting result under the corresponding current.

[0098] In this embodiment, the detection standard is a preset standard, which is composed of the standard characteristics of each element in the power detection circuit under different test currents, and if the first reasonable analysis value does not meet the detection standard, the value is extracted as the first abnormal value, and if the second reasonable analysis value does not meet the detection standard, the value is extracted as the second abnormal value.

[0099] In this embodiment, the value analysis model is a preset model, which is based on the abnormal values of each detection element in the entire power detection circuit under different test currents, and the combination of different abnormal values corresponds to the specified abnormal element and abnormal line segment as a sample, which is obtained by training through a neural network model, and the specific abnormal element and abnormal line segment of the power detection circuit can be further determined by analyzing the first abnormal value and the second abnormal value.

[0100] The beneficial effects of the above technical solutions are: by performing qualified verification on the power detection circuit and replacing the unqualified components and abnormal line segments, the qualified power detection circuit is ensured, so that the real-time detection voltage and the real-time detection current detected will not be affected by the power detection circuit, and the possibility of errors in the real-time detection power caused by the failure of the power detection circuit is excluded, and by ensuring the accuracy of the real-time detection voltage and the real-time detection current, the accuracy of the real-time monitoring power value is further ensured.

[0101] The embodiment of the present application provides a microwave heating furnace power control and flattening method, which compares with the standard characteristic curve under the corresponding heating gear to determine the gear failure factor, comprising:

[0102] The actual characteristic curve and the standard characteristic curve are time-aligned according to the heating attribute of the microwave heating furnace, and the first distance from a first point on the actual characteristic curve to a second point on the standard characteristic curve at the same time point is obtained;

[0103] All first distances are averaged to obtain a distance average value

[0104] If D1' is greater than D2', then the failure factor is 1, wherein D1' is the first standard average value; If D1' is less than D2', then the failure factor is 0, wherein D2' is the second standard average value, and the first standard average value is greater than the second standard average value;

[0105]

[0106] ​​Otherwise, the fluctuation range of the input power is determined by the standard characteristic curve, and the power value corresponding to each time point on the actual characteristic curve is compared with the fluctuation range of the standard characteristic curve:

[0107]

[0108]

[0109] wherein S1 n represents the final failure coefficient of the power value of the nth time point in the actual characteristic curve; P min represents the minimum power value of the curve fluctuation range, P max represents the maximum power value of the curve fluctuation range, and [P min , P max ] is the fluctuation range of the standard input power; S1 is the gear sub-failure factor corresponding to the nth time point in the actual characteristic curve, is the failure coefficient corresponding to the nth time point in the actual characteristic curve when the power value is less than P min , is the failure coefficient corresponding to the nth time point in the actual characteristic curve when the power value is greater than P max ; S0 represents the gear failure factor of the actual characteristic curve; P' n represents the corresponding preset power threshold; (S1 n1 ) max represents the maximum factor of the gear sub-failure factors at the N1 time points in the stable stage in the actual characteristic curve; (S1 n1 ) min represents the minimum factor of the gear sub-failure factors at the N1 time points in the stable stage in the actual characteristic curve; S1 n1 represents the gear sub-failure factor at the n1th time point in the stable stage in the actual characteristic curve. represents the fine tuning function, the fine tuning factor of the fine tuning function is obtained based on the function mapping table, and the value range of the fine tuning factor is [0, 0.1].

[0110] In this embodiment, the heating attribute refers to that different output powers corresponding to different gears of the same batch type of microwave heating furnace have a certain fluctuation range, so the standard characteristic curves corresponding to the same batch type of heating furnaces will be different.

[0111] In this embodiment, the first distance refers to the distance on the characteristic curve between the actual power value and the standard power value at the same time point, which represents the difference between the actual power value and the standard power value at the same time point.

[0112] In this embodiment, the average processing refers to accumulating all the first distances and dividing the average value by the number of the first distances.

[0113] In this embodiment, the final failure coefficient represents the difference degree of the heating effect of the actual power value at the nth time point and the standard power value.

[0114] In this embodiment, since there is a certain error in the calculation process of the failure coefficient, the error generated in the calculation process can be eliminated by the fine tuning coefficient, and the appropriate fine tuning factor can be selected in the preset function mapping table according to the corresponding calculation mode.

[0115] In this embodiment, the first standard average value can be 10 watts, and the second standard average value can be 6 watts.

[0116] The beneficial effects of the above technical solutions are: by calculating and analyzing the difference between the standard characteristic curve and the actual characteristic curve, the final failure coefficient of different time points in the actual characteristic curve is obtained, and the fine tuning factor is obtained through the function mapping table, which can improve the accuracy of the final gear failure factor, and ensure the accuracy of further obtaining the adjustment instruction.

[0117] The embodiment of the application provides a microwave heating furnace power control and flattening method, before comparing the power value corresponding to each time point on the actual characteristic curve with the standard characteristic curve fluctuation range, comprising:

[0118]

[0119]

[0120] Wherein, P n The standard power value at the nth time point on the standard characteristic curve is represented; N represents the number of time points on the standard characteristic curve, and is consistent with the number of time points on the actual characteristic curve; P0 min The minimum original power value in the stable stage of the standard fluctuation curve is represented, and P0 max The maximum original power value in the stable stage of the standard fluctuation curve is represented.

[0121] In this embodiment, the original power value refers to the power value on the standard characteristic curve.

[0122] The beneficial effects of the above technical solutions are: determining the fluctuation range of the standard characteristic curve is helpful to compare the actual characteristic curve with the standard characteristic curve, is helpful to more accurately reflect the working characteristics of the microwave heating furnace, and is helpful to realize the control and flattening of the microwave heating furnace power.

[0123] The embodiment of the present application provides a microwave heating furnace power control and flattening method, when the gear failure factor is not 0, an adjustment instruction is obtained from a factor-gear-adjustment mapping table, including:

[0124] The set gear of the microwave heating furnace and the gear failure factor are acquired.

[0125] The set gear, the gear failure factor and the factor-gear-adjustment mapping table are matched to obtain the adjustment instruction.

[0126] In the embodiment, the adjustment instruction can adjust the working power of the microwave heating furnace to obtain the adjusted working power.

[0127] The above technical scheme has the beneficial effect that the adjustment instruction is obtained through the mapping table, and an accurate adjustment scheme is provided for subsequent adjustment of the working power.

[0128] The embodiment of the present application provides a microwave heating furnace power control and flattening method, to control the process that the microwave heating furnace works according to the second power, further comprising:

[0129] The duty cycle of the pulse width signal generated by the microwave heating furnace microcontroller is adjusted based on the adjustment instruction to obtain the adjusted duty cycle.

[0130] The frequency adjustment information is generated based on the duty cycle, and the frequency conversion frequency of the microwave heating furnace is adjusted based on the frequency adjustment information to obtain the adjusted frequency conversion frequency.

[0131] The output power of the magnetron is adjusted based on the adjusted frequency conversion frequency and the frequency-output power relationship mapping table to obtain the second power.

[0132] The microwave heating furnace is controlled to work according to the second power.

[0133] In the embodiment, the width of the pulse is called the pulse width, and the shape, amplitude and width of the pulse are important parameters of the pulse. The number of pulses repeated periodically per second is called the pulse frequency, and the reciprocal is called the pulse period.

[0134] In the embodiment, the frequency-output power relationship mapping table reflects the one-to-one correspondence between the frequency conversion frequency of the microwave heating furnace and the output power.

[0135] The above technical scheme has the beneficial effect that the adjusted frequency conversion frequency is obtained by adjusting the pulse signal width through the adjustment instruction, and the adjusted output power of the magnetron is further obtained through the frequency conversion frequency, which can ensure the effectiveness of power adjustment.

[0136] The embodiment of the present application provides a microwave heating furnace power control and flattening method, based on the adjustment instruction, the duty cycle of a pulse width signal generated by a microwave heating furnace microcontroller is adjusted, an adjusted duty cycle is obtained, and the method comprises the following steps:

[0137] The theoretical input power value corresponding to different gears of the microwave heating furnace is obtained from a gear-power mapping table, that is, the first power, a first duty cycle is obtained based on a preset power-duty cycle mapping table;

[0138] The second power and the first power are compared to obtain a power difference value;

[0139] P = P2-P1

[0140] Wherein, P is the power difference value, P2 is the second power, and P1 is the first power;

[0141] Based on the power difference value, the duty cycle is adjusted to obtain a second duty cycle.

[0142] In the embodiment, the preset power-duty cycle mapping table means that different powers correspond to different duty cycles, and the new duty cycle corresponding to the adjusted power can be obtained through the mapping table.

[0143] The beneficial effects of the above technical scheme are that the duty cycle is adjusted through the power difference value, accurate information can be provided for the frequency adjustment, the accuracy of the power adjustment is ensured, and effective information is provided for the microwave heating furnace power control and flattening.

[0144] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A power control method for a microwave heating furnace, characterized in that, include: Step 1: When the microwave oven is in heating mode, capture the actual characteristic curve of the magnetron in the heating mode and compare it with the standard characteristic curve of the corresponding heating level to determine the level failure factor. Step 2: When the gear failure factor is 0, control the microwave heating furnace under the corresponding gear to continue working at the first power. Step 3: When the gear failure factor is not 0, obtain the adjustment instruction from the factor-gear-adjustment mapping table, and automatically adjust the magnetron according to the adjustment instruction to control the microwave heating furnace to work at the second power. The actual characteristic curve reflects the relationship between the real-time input power of the microwave heating furnace and the microwave heating time. The standard characteristic curve reflects the relationship between the standard input power of the microwave heating furnace and the microwave heating time. The first power is the standard operating power corresponding to the microwave heating furnace when it is operating at the corresponding setting; In step 1, the characteristic curve is compared with that of the corresponding heating setting to determine the setting failure factor, including: The actual characteristic curve and the standard characteristic curve are time-aligned according to the heating properties of the microwave heating furnace, and the first distance from the first point on the actual characteristic curve to the second point on the standard characteristic curve at the same time point is obtained respectively. Average all the first distances to obtain the average distance. ; like If the value is greater than D1', then the failure factor is determined to be 1, where D1' is the average value of the first standard. If <D2’, the failure factor is determined to be 0, where D2’ is the second standard average value, and the first standard average value is greater than the second standard average value; Otherwise, determine the fluctuation range of the input power using the standard characteristic curve, and compare the power value at each time point on the actual characteristic curve with the fluctuation range of the standard characteristic curve: Among them, S1 n P represents the final failure factor representing the power value at the nth time point in the actual characteristic curve; min P represents the minimum power value representing the range of fluctuation of the curve. max This represents the maximum power value within the range of curve fluctuations, and [P] min P max ] represents the fluctuation range of the standard input power; ∂1 n The power value at the nth time point in the actual characteristic curve is less than P. min When, the corresponding failure coefficient, ∂2 n The power value at the nth time point in the actual characteristic curve is greater than P. max When, the corresponding failure coefficient; S0 represents the gear failure factor of the actual characteristic curve; This represents the power value at the nth time point in the actual characteristic curve. This represents the maximum factor among the failure factors of the gear shifter at N1 time points in the stable phase of the actual characteristic curve. This represents the minimum factor among the N1 time points in the stable phase of the actual characteristic curve, indicating the failure factor of the gear shifter. This represents the failure factor of the gear shifter at the n1th time point in the stable phase of the actual characteristic curve. This represents a fine-tuning function, whose fine-tuning factor is obtained based on a function mapping table, and the fine-tuning factor takes values ​​in the range [0, 0.1].

2. The microwave heating furnace power control method according to claim 1, characterized in that, In step 1, when the microwave oven is in heating mode, the actual characteristic curve of the magnetron in the heating mode is captured, including: Connect the microwave heating furnace to the power supply and put the microwave heating furnace into the heating state; A power detection circuit is established to monitor the input voltage and input current of the magnetron in the microwave heating furnace in real time, so as to obtain the real-time input power. Based on the real-time input power and the heating time of the microwave heating furnace, an actual characteristic curve of the magnetron under heating state is established.

3. The microwave heating furnace power control method according to claim 2, characterized in that, Before establishing a power detection circuit to monitor the input voltage and current of the magnetron in the microwave heating furnace in real time and obtain the real-time input power, the following steps are included: verifying the qualification of the power detection circuit, specifically including: Several test currents are input to the power detection circuit from small to large to construct a test vector for each detection element in the power detection circuit and a test matrix is ​​constructed. The test matrix has n1 columns and n2 rows, where n2 represents the number of test currents, n1 represents the number of detection elements, and each detection element contains three test results, namely current, voltage, and resistance. Based on the component test relationships determined by the circuit setup structure of the power detection circuit, a first reasonable analysis is performed on each row of the test vector in the test matrix; in, This represents the first reasonable analytical value of the corresponding row's test vector; Indicates the number of detection elements present in the power detection circuit; This represents the voltage weight corresponding to the i1th detection element; This represents the standard voltage of the i1th detection element under the corresponding test current, determined based on the element test relationship; This represents the actual voltage of the i1th sensing element under the corresponding test current; This represents the standard current of the i1th detection element under the corresponding test current, determined based on the element test relationship; This represents the actual current of the i1th detection element under the corresponding test current; This represents the current weight corresponding to the i1th detection element; This represents the standard resistance of the i1th detection element under the corresponding test current, determined based on the element test relationship; This represents the actual resistance of the i1th sensing element under the corresponding test current; This represents the resistance weight corresponding to the i1th detection element; Indicates from all The maximum value obtained from it; Indicates from all The maximum value obtained from it; Indicates from all The maximum value obtained from it; For each column of the test vector in the test matrix, perform a first fit on all voltages, a second fit on all currents, and a third fit on all resistances; The first, second, and third fitting results are compared with the corresponding standard fitting results obtained by the detection element based on the current magnitude relationship of the test current, and the fitting curves are made accordingly. The first fitting difference of the first fitting result, the second fitting difference of the second fitting result, and the third fitting difference of the third fitting result are obtained respectively, and input into the anomaly analysis model to obtain the second reasonable analysis value corresponding to the same detection element; When all first reasonable analysis values ​​and all second reasonable analysis values ​​meet the detection criteria, the power detection circuit is deemed qualified. Otherwise, extract the first and second outliers that do not meet the detection criteria; All first and second outliers are input into the value analysis model to identify the abnormal components and abnormal line segments of the power detection circuit. The abnormal components and abnormal circuit segments were replaced to obtain a qualified power detection circuit.

4. The microwave heating furnace power control method according to claim 1, characterized in that, Before comparing the power value at each time point on the actual characteristic curve with the fluctuation range of the standard characteristic curve, the following steps are taken: Determining the fluctuation range of the standard characteristic curve, specifically including: Among them, P n P0 represents the standard power value at the nth time point on the standard characteristic curve; N represents the number of time points on the standard characteristic curve, which is consistent with the number of time points on the actual characteristic curve; min P0 represents the minimum initial power value during the steady phase of the standard fluctuation curve. max This represents the maximum original power value during the steady phase of the standard fluctuation curve.

5. The microwave heating furnace power control method according to claim 1, characterized in that, In step 3, when the gear failure factor is not 0, an adjustment instruction is obtained from the factor-gear-adjustment mapping table, including: Obtain the set gear and gear failure factor of the microwave heating furnace; Based on the set gear position, gear failure factor and factor-gear-adjustment mapping table, the adjustment instruction is obtained.

6. The power control method for a microwave heating furnace according to claim 1, characterized in that, The process of controlling the microwave heating furnace to operate at the second power also includes: The duty cycle of the pulse width signal generated by the microwave heating furnace microcontroller is adjusted based on the adjustment command to obtain the adjusted duty cycle; Frequency adjustment information is generated based on the duty cycle, and the frequency conversion frequency of the microwave heating furnace is adjusted based on the frequency adjustment information to obtain the adjusted frequency conversion frequency. The output power of the magnetron is adjusted based on the adjusted frequency and frequency-output power relationship mapping table to obtain the second power; Control the microwave heating oven to operate at the second power level.

7. The microwave heating furnace power control method according to claim 6, characterized in that, The duty cycle of the pulse width signal generated by the microwave heating furnace microcontroller is adjusted based on the adjustment command to obtain the adjusted duty cycle, including: Obtain the theoretical input power value corresponding to different power levels of the microwave heating furnace from the power level-power mapping table, i.e., the first power, and obtain the first duty cycle based on the preset power-duty cycle mapping table; The power difference is obtained by comparing the second power with the first power. Where P is the power difference, P2 is the second power, and P1 is the first power; The duty cycle is adjusted based on the power difference to obtain a second duty cycle.

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