Microwave oven rapid heating control method and system

Abstract

The invention discloses a rapid heating control method and system for a microwave oven. The method comprises the following steps: detecting a microwave signal in a microwave oven body, working temperature data of a variable-frequency power supply and an anode voltage signal of a magnetron in real time; determining the current working state of the microwave oven according to the field intensity of the microwave signal, and determining the anode temperature data of the magnetron according to the anode voltage signal of the magnetron; judging whether the current working state of the microwave oven is a preset non-no-load state or not, whether the working temperature data is smaller than or equal to a first preset temperature threshold value or not and whether the anode temperature data is smaller than or equal to a second preset temperature threshold value or not, and if yes, controlling the microwave oven to enter a rapid heating working mode, otherwise, controlling the microwave oven to perform a normal heating working mode. The microwave heating efficiency can be improved, and the safety of microwave oven devices can be guaranteed, so that the use stability of the microwave oven is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave ovens, and particularly to a method and system for rapid heating control of a microwave oven. Background Art

[0002] A microwave oven is a device that uses an electric current to generate microwaves and irradiates the microwaves onto food (i.e., the load) to heat the food, which can heat the surface and interior of the food simultaneously and quickly cook a variety of foods.

[0003] Currently, microwave ovens are limited by the no-load condition, resulting in their inability to output a large or maximum microwave power. Generally, normal microwave heating is carried out at the rated power and below, thus affecting the heating efficiency of the microwave. For example, when food is normally placed in a current microwave oven, i.e., in a non-no-load state, most of the microwave energy is absorbed by the food, and the microwave system generates little heat, and normal heating work can be carried out; while when there is no food placed, or when the moisture in the heated food is too little, or incorrect food or utensils are placed, i.e., when the microwave oven is in a no-load state, the microwaves will not be absorbed by the food, causing the microwaves to bounce back to the magnetron; if the microwave output power exceeds the rated power, it will cause the microwave system to generate a large amount of heat, which will cause the magnetron to heat up violently. When the temperature of the magnetron is too high, if the microwave output power of the magnetron is not reduced, it will make the magnetron prone to problems such as cracked magnetism, air leakage, and filament aging, and may even cause the magnetron to fail, thus affecting the heating work of the microwave oven and reducing the use stability of the microwave oven. In this regard, there is an urgent need for a method and system for rapid heating control of a microwave oven that can automatically adjust the microwave output power based on the working state and device temperature of the microwave oven to ensure high microwave heating efficiency and high use stability of the microwave oven. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and system for rapid heating control of a microwave oven, which can improve the microwave heating efficiency and ensure the safety of microwave oven devices, thereby improving the use stability of the microwave oven.

[0005] To solve the above technical problems, the present invention provides a method for controlling rapid heating of a microwave oven, including: S101, detecting in real time the microwave signal in the microwave oven body, the operating temperature data of the variable frequency power supply, and the anode voltage signal of the magnetron; S102, determining the current operating state of the microwave oven according to the field strength of the microwave signal, wherein the operating state includes a non-empty load state and an empty load state; S103, determining the anode temperature data of the magnetron according to the anode voltage signal of the magnetron; S104, judging whether the current operating state of the microwave oven is a preset non-empty load state, whether the operating temperature data is less than or equal to a first preset temperature threshold, and whether the anode temperature data is less than or equal to a second preset temperature threshold. If the judgment is yes, then control the microwave oven to enter the rapid heating working mode, start timing, and execute step S105. Otherwise, control the microwave oven to enter the normal heating working mode; S105, judging whether the rapid heating duration of the microwave oven reaches a preset rapid heating time threshold. If the judgment is yes, then control the microwave oven to enter the normal heating working mode. If the judgment is no, return to step S101.

[0006] As an improvement of the above solution, the step of determining the current operating state of the microwave oven according to the field strength of the microwave signal includes: obtaining a state voltage signal corresponding to the field strength of the microwave signal according to the microwave signal; when the state voltage signal is greater than a preset voltage signal, then determine that the current operating state of the microwave oven is an empty load state.

[0007] As an improvement of the above solution, the step of obtaining a state voltage signal corresponding to the field strength of the microwave signal according to the microwave signal includes: obtaining the microwave signal and converting it into a state AC signal; rectifying the state AC signal to obtain a state DC signal; determining the state voltage signal corresponding to the field strength of the microwave signal according to the DC signal.

[0008] As an improvement of the above solution, the step of determining the anode temperature data of the magnetron according to the anode voltage signal of the magnetron includes: determining the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron; calculating the anode temperature data of the magnetron according to the anode threshold voltage of the magnetron.

[0009] As an improvement of the above solution, the step of determining the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron includes: obtaining the anode voltage signal applied across the magnetron, the equivalent resistance of the magnetron, and the output power of the variable frequency power supply; calculating the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron, the equivalent resistance of the magnetron, and the output power of the variable frequency power supply.

[0010] The present invention also provides a microwave oven rapid heating control system, including: a detection module for real-time detecting microwave signals in the microwave oven body, the operating temperature data of the frequency conversion power supply, and the anode voltage signal of the magnetron; a working state determination module for determining the current working state of the microwave oven according to the field strength of the microwave signal, wherein the working state includes a non-empty load state and an empty load state; a magnetron temperature processing module for determining the anode temperature data of the magnetron according to the anode voltage signal of the magnetron; a main control module for determining whether the current working state of the microwave oven is a preset non-empty load state, whether the operating temperature data is less than or equal to a first preset temperature threshold, and whether the anode temperature data is less than or equal to a second preset temperature threshold. If the determination is yes, then control the microwave oven to enter the rapid heating working mode and start timing. Otherwise, control the microwave oven to enter the normal heating working mode; and is also used for determining whether the rapid heating duration of the microwave oven reaches a preset rapid heating time threshold in the rapid heating working mode. If the determination is yes, then control the microwave oven to enter the normal heating working mode. If the determination is no, continue to control the detection module, the working state determination module, and the magnetron temperature processing module to work.

[0011] As an improvement of the above solution, the working state determination module includes: a state voltage determination unit for obtaining a state voltage signal corresponding to the field strength of the microwave signal according to the microwave signal; a state processing unit for determining that the current working state of the microwave oven is an empty load state when the state voltage signal is greater than a preset voltage signal.

[0012] As an improvement of the above solution, the state voltage determination unit includes; a signal processing subunit for obtaining the microwave signal and converting it into a state AC signal; a rectification processing subunit for rectifying the state AC signal to obtain a state DC signal; a state voltage processing subunit for determining the state voltage signal corresponding to the field strength of the microwave signal according to the DC signal.

[0013] As an improvement of the above solution, the magnetron temperature processing module includes: a threshold processing unit for determining the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron; a temperature processing unit for calculating the anode temperature data of the magnetron according to the anode threshold voltage of the magnetron.

[0014] As an improvement of the above solution, the threshold processing unit includes: an acquisition subunit for acquiring the anode voltage signal applied across the magnetron, the equivalent resistance of the magnetron, and the output power of the frequency conversion power supply; a threshold calculation subunit for calculating the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron, the equivalent resistance of the magnetron, and the output power of the frequency conversion power supply.

[0015] Implementing the present invention has the following beneficial effects:

[0016] The present invention can automatically adjust the microwave oven to different heating modes according to the working state of the microwave oven and the device temperature, so as to improve the heating efficiency. At the same time, it can effectively prevent the situation of furnace cavity sparking, burning out the furnace door and magnetron and other devices due to large microwave output power in the no-load state, ensure the safety of the microwave oven devices, and thus improve the use stability of the microwave oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flowchart of the rapid heating control method of the microwave oven of the present invention;

[0018] Figure 2 is a schematic structural diagram of the rapid heating control system of the microwave oven of the present invention;

[0019] Figure 3 is a schematic structural diagram of the working state determination module of the present invention;

[0020] Figure 4 is a schematic structural diagram of the state voltage determination unit of the present invention;

[0021] Figure 5 is a schematic structural diagram of the magnetron temperature processing module of the present invention;

[0022] Figure 6 is a schematic structural diagram of the threshold processing unit of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] As Figure 1 shown, a specific embodiment of the present invention provides a rapid heating control method for a microwave oven, including:

[0025] S101. Real-time detect the microwave signal in the microwave oven body, the working temperature data of the variable frequency power supply, and the anode voltage signal of the magnetron;

[0026] It should be noted that a working state determination module or device is provided on one outer wall of the microwave oven body. The working state determination module can detect the microwave signal radiated outward through the through hole on one side of the microwave oven body, so as to facilitate subsequent determination of the working state of the microwave oven according to the microwave signal.

[0027] By means of the temperature sensing device provided on the variable frequency power supply, the working temperature data of the variable frequency power supply can be detected in real time to avoid burning out itself and its surrounding circuit devices due to excessive temperature of the variable frequency power supply. Among them, the temperature sensing device is preferably an NTC temperature sensing device, but is not limited thereto.

[0028] The anode voltage signal applied across the magnetron can be collected by the provided voltage acquisition module or device, so as to subsequently determine the anode temperature of the magnetron based on this signal, thereby avoiding the magnetron from burning out itself and its surrounding circuit components due to excessive temperature.

[0029] S102. Determine the current working state of the microwave oven according to the field strength of the microwave signal, where the working state includes a non-empty load state and an empty load state;

[0030] Specifically, the step of determining the current working state of the microwave oven according to the field strength of the microwave signal includes:

[0031] Step 1. Obtain a state voltage signal corresponding to the field strength of the microwave signal according to the microwave signal;

[0032] Among them, the step of obtaining a state voltage signal corresponding to the field strength of the microwave signal according to the microwave signal includes:

[0033] Step (1). Obtain the microwave signal and convert it into a state AC signal;

[0034] Step (2). Rectify the state AC signal to obtain a state DC signal;

[0035] Step (3). Determine the state voltage signal corresponding to the field strength of the microwave signal according to this DC signal.

[0036] It should be noted that the signal processing sub-unit in the working state determination module receives the microwave signal and generates a state AC signal corresponding to this microwave signal; the rectification processing sub-unit in the working state determination module rectifies the state AC signal to obtain a state DC signal; the state DC signal charges the state voltage processing sub-unit in the working state determination module, so that the state processing sub-unit generates a state voltage signal corresponding to the field strength of the microwave signal, thereby facilitating subsequent comparison of this state voltage signal with a preset threshold to determine whether the microwave oven is in an empty load state or a non-empty load state, and then adjusting the working state of the microwave oven faster. For example, reducing the heating power of the microwave oven is beneficial to reducing the risk of damage to the microwave oven, and at the same time improves the use stability or safety of the microwave oven.

[0037] Among them, such as Figure 4As shown in the figure, the signal processing subunit includes, but is not limited to, an antenna component and a first resistor. The first end of the antenna component is connected to the first end of the first resistor and the rectification processing subunit, and the second end of the antenna component and the second end of the first resistor are both grounded. The antenna component is used to receive microwave signals and generate a first AC signal; the first resistor is used to provide an impedance matching the antenna component to obtain a larger output power, which is beneficial to making the detection result more accurate.

[0038] The rectification processing subunit includes, but is not limited to, a diode and a second resistor. The anode of the diode is connected to the first end of the first resistor in the signal processing subunit, and the cathode of the diode is connected to the state voltage processing subunit. Since the diode has unidirectional conductivity, the diode can be used to rectify the first AC signal into a first DC signal. The first end of the second resistor is connected to the first end of the first resistor in the signal processing subunit, and the second end of the second resistor is connected to the anode of the diode. The second resistor serves as a current-limiting resistor to prevent the diode from being damaged due to overload caused by excessive surge signals, which is beneficial to protecting the diode.

[0039] The filtering unit includes, but is not limited to, a capacitor and a third resistor. The first end of the capacitor is connected to the cathode of the diode in the rectification processing subunit, the second end of the capacitor is grounded, and the capacitor is connected in parallel with the third resistor. The capacitor can be charged by the state DC signal to generate a state voltage signal corresponding to the field strength of the microwave signal at both ends. At the same time, the capacitor can also act as a filtering capacitor to filter out high-frequency pulses that may exist in the state DC signal, thereby obtaining a smooth state voltage signal, which is a low-frequency DC signal. The third resistor is used to provide a discharge branch to discharge the stored charge of the capacitor through the third resistor when the capacitor needs to discharge.

[0040] Step 2: When the state voltage signal is greater than the preset voltage signal, it is determined that the current working state of the microwave oven is the no-load state.

[0041] It should be noted that when the load state in the microwave oven is different (such as when food is placed normally, no food is placed, or the moisture in the heated food is too little or the food or utensil is placed incorrectly), the field strength of the microwave signal detected by the working state determination module is also different. When the state voltage signal is greater than the preset voltage signal, it is determined that the current working state of the microwave oven is the no-load state, and corresponding solutions are adopted according to the detection result, such as reducing the microwave power to prevent damage to the microwave oven.

[0042] S103: Determine the anode temperature data of the magnetron according to the anode voltage signal of the magnetron;

[0043] Specifically, the step of determining the anode temperature data of the magnetron according to the anode voltage signal of the magnetron includes:

[0044] Step 1: Determine the anode threshold voltage of the magnetron based on the anode voltage signal of the magnetron.

[0045] Among them, the step of determining the anode threshold voltage of the magnetron based on the anode voltage signal of the magnetron includes:

[0046] Step (1): Obtain the anode voltage signal applied across the magnetron, the equivalent resistance of the magnetron, and the output power of the frequency conversion power supply.

[0047] Step (2): Calculate the anode threshold voltage of the magnetron based on the anode voltage signal of the magnetron, the equivalent resistance of the magnetron, and the output power of the frequency conversion power supply.

[0048] It should be noted that the equivalent resistance R of the magnetron, the input power Pin of the frequency conversion power supply, and the power efficiency Eff are known. According to the output power calculation formula: Pout =

[0049] Pin * Eff, the output power Pout of the required frequency conversion power supply can be calculated. The anode voltage signal Ebm applied across the magnetron can be collected through a voltage acquisition module, and this voltage acquisition module can be a conventional voltage acquisition circuit.

[0050] The anode threshold voltage VT of the magnetron can be calculated through the following formula:

[0051] Ebm = VT + R * It;

[0052] It = Po / Ebm;

[0053] Among them, It is the anode current of the magnetron. According to the above parameters and formulas, the current anode threshold voltage VT of the magnetron can be calculated, so as to determine the anode temperature of the magnetron based on this anode threshold voltage subsequently.

[0054] Step 2: Calculate the anode temperature data of the magnetron based on the anode threshold voltage of the magnetron.

[0055] It should be noted that according to the anode threshold voltage of the magnetron, query and match with a preset voltage-temperature conversion table to obtain the anode temperature data corresponding to this anode threshold voltage. Among them, the preset voltage-temperature conversion table includes different anode threshold voltages and the anode temperature data corresponding to different anode threshold voltages.

[0056] S104. Determine whether the current working state of the microwave oven is a preset non - empty - load state, whether the working temperature data is less than or equal to the first preset temperature threshold, and whether the anode temperature data is less than or equal to the second preset temperature threshold. If the judgment is yes, then control the microwave oven to enter the rapid heating working mode, start timing, and execute step S105; otherwise, control the microwave oven to enter the normal heating working mode;

[0057] It should be noted that when the current working state of the microwave oven is a non - empty - load state, the working temperature data of the variable - frequency power supply is less than or equal to the first preset temperature threshold, and the anode temperature data of the magnetron is less than or equal to the second preset temperature threshold, it means that the microwave oven is in a non - empty - load state, and at the same time, the temperatures of each component are within the safe temperature range. At this time, the microwave oven can be controlled to enter the rapid heating working mode and start timing. For example, the main control module of the microwave oven can send a power - regulation signal to the variable - frequency power supply to make the variable - frequency power supply increase the microwave output power of the magnetron, thereby improving the microwave heating efficiency of the microwave oven and meeting the user's rapid heating requirements. When at least one of the above three judgment conditions cannot be met, the microwave oven is controlled to continue to maintain the normal heating working mode to avoid damage to the microwave oven and improve the use stability and safety of the microwave oven.

[0058] Preferably, for the rapid heating working mode, a corresponding rapid - heating control button can also be set; when the user needs to use the rapid heating working mode, a corresponding control signal can be input through the rapid - heating control button. The main control module in the microwave oven can execute the above - mentioned working steps according to this control signal. When the rapid heating working mode is not needed, the main control module controls the microwave oven to enter the normal heating working mode due to the absence of a corresponding control signal.

[0059] S105. Determine whether the rapid - heating duration of the microwave oven has reached the preset rapid - heating time threshold. If the judgment is yes, then control the microwave oven to enter the normal heating working mode; if the judgment is no, return to step S101.

[0060] It should be noted that in order to improve the use safety of the microwave oven, the present invention presets a corresponding rapid - heating time threshold to avoid the temperature of the working components of the microwave oven being too high or the load of the working components being too high due to the microwave oven being in the rapid heating working mode for too long, which affects the service life of the working components and the microwave oven. When the rapid - heating duration of the microwave oven reaches the preset rapid - heating time threshold, the main control module controls the microwave oven to be in the normal heating working mode to improve the system safety of the microwave oven.

[0061] Specifically, the working principle of the present invention is further described through specific embodiments as follows:

[0062] Taking a microwave oven with a normal rated power of 800W as an example, when it works normally, the maximum rated output power of the microwave oven is 800W microwave output power. When the user inputs a quick heating control signal and a heating time to the main control module through the quick heating control button and the time setting button on the microwave oven control panel. The main control module controls the microwave oven to heat normally at 800W microwave output power and obtains the current working state of the microwave oven, the working temperature data of the frequency conversion power supply and the anode temperature data of the magnetron in real time. When the current working state of the microwave oven is a non-empty load state, the working temperature data of the frequency conversion power supply is less than or equal to the first preset temperature threshold, and the anode temperature data of the magnetron is less than or equal to the second preset temperature threshold, the main control module controls the microwave oven to perform quick heating work at 1200W microwave output power and starts timing; when any of the above conditions is not met during the working process, it switches to the normal working mode, and the microwave oven operates at the set power of 800W until the heating time of the microwave oven ends. For example, if the water dries up during the heating process and the cavity becomes an empty load characteristic, at this time, the microwave oven is controlled to switch to the 800W set power mode. Another example is when the temperature of the power device on the frequency conversion board exceeds the first preset temperature threshold or the anode temperature of the magnetron exceeds the second preset temperature threshold, the microwave oven is also controlled to switch to the 800W set power operation to ensure high heating efficiency and the safety of using the microwave oven. In addition, in the 1200W high-power quick heating mode, when the quick heating duration exceeds the preset quick heating time threshold, the microwave is also controlled to switch to the normal working mode to improve system safety.

[0063] In this embodiment, the first preset temperature threshold is preferably 80 degrees, but it is not limited thereto.

[0064] In this embodiment, the second preset temperature threshold is preferably 150 degrees, but it is not limited thereto.

[0065] In this embodiment, the preset quick heating time threshold is preferably 3 minutes, but it is not limited thereto; when the set heating time is less than or equal to 3 minutes, in any case, as long as the working duration of the microwave oven reaches the heating time, the microwave oven is controlled to stop working.

[0066] As Figure 2 shown, the present invention also provides a microwave oven quick heating control system 1, including:

[0067] A detection module 2, configured to detect the microwave signal in the microwave oven body, the working temperature data of the frequency conversion power supply, and the anode voltage signal of the magnetron in real time;

[0068] It should be noted that a working state determination module or device is provided on one outer wall of the microwave oven body. The working state determination module can detect the microwave signal radiated outward through the through hole on one side of the microwave oven body, so as to facilitate determining the working state of the microwave oven according to the microwave signal subsequently.

[0069] The temperature sensing device provided on the variable frequency power supply can detect the working temperature data of the variable frequency power supply in real time to avoid the variable frequency power supply being burned out due to excessive temperature and its surrounding circuit components. Among them, the temperature sensing device is preferably an NTC temperature sensing device, but not limited thereto.

[0070] The voltage acquisition module or device provided can acquire the anode voltage signal applied across the magnetron, so as to facilitate determining the anode temperature of the magnetron according to the signal subsequently, thereby avoiding the magnetron being burned out due to excessive temperature and its surrounding circuit components.

[0071] The working state determination module 3 is used to determine the current working state of the microwave oven according to the field strength of the microwave signal, wherein the working state includes a non-empty load state and an empty load state;

[0072] Specifically, as Figures 3 to 4 shown, the working state determination module 3 includes: a state voltage determination unit 31, which is used to obtain a state voltage signal corresponding to the field strength of the microwave signal according to the microwave signal;

[0073] Among them, the state voltage determination unit 31 includes;

[0074] A signal processing sub-unit 311, which is used to obtain the microwave signal and convert it into a state AC signal;

[0075] A rectification processing sub-unit 312, which is used to rectify the state AC signal to obtain a state DC signal;

[0076] A state voltage processing sub-unit 313 determines the state voltage signal corresponding to the field strength of the microwave signal according to the DC signal.

[0077] It should be noted that the signal processing subunit in the working state determination module receives a microwave signal and generates a state alternating current signal corresponding to the microwave signal; the rectification processing subunit in the working state determination module rectifies the state alternating current signal to obtain a state direct current signal; the state direct current signal charges the state voltage processing subunit in the working state determination module, so that the state processing subunit generates a state voltage signal corresponding to the field strength of the microwave signal, thereby facilitating subsequent comparison of the state voltage signal with a preset threshold to determine whether the microwave oven is in an empty load state or a non-empty load state, and then adjusting the working state of the microwave oven more quickly. For example, reducing the heating power of the microwave oven is beneficial to reducing the risk of damage to the microwave oven, and at the same time, the use stability or safety of the microwave oven is improved.

[0078] Among them, as Figure 4 shown, the signal processing subunit includes but is not limited to an antenna component and a first resistor. The first end of the antenna component is connected to the first end of the first resistor and the rectification processing subunit, and the second end of the antenna component and the second end of the first resistor are both grounded. The antenna component is used to receive the microwave signal and generate a first alternating current signal; the first resistor is used to provide an impedance matching the antenna component to obtain a larger output power, which is beneficial to making the detection result more accurate.

[0079] The rectification processing subunit includes but is not limited to a diode and a second resistor. The anode of the diode is connected to the first end of the first resistor in the signal processing subunit, and the cathode of the diode is connected to the state voltage processing subunit. Since the diode has unidirectional conductivity, the diode can be used to rectify the first alternating current signal into a first direct current signal. The first end of the second resistor is connected to the first end of the first resistor in the signal processing subunit, and the second end of the second resistor is connected to the anode of the diode. The second resistor serves as a current limiting resistor to prevent the diode from being damaged due to overloading caused by excessive surge signals, which is beneficial to protecting the diode.

[0080] The filtering unit includes but is not limited to a capacitor and a third resistor. The first end of the capacitor is connected to the cathode of the diode in the rectification processing subunit, the second end of the capacitor is grounded, and the capacitor is connected in parallel with the third resistor. The capacitor can be charged by the state direct current signal to generate a state voltage signal corresponding to the field strength of the microwave signal at both ends. At the same time, the capacitor can also be used as a filtering capacitor to filter out high-frequency pulses that may exist in the state direct current signal, so as to obtain a smooth state voltage signal, and the state voltage signal is a low-frequency direct current signal. The third resistor is used to provide a discharging branch, so that when the capacitor needs to discharge, the stored charge can be discharged through the third resistor.

[0081] The state processing unit 32 is used to determine that the current working state of the microwave oven is an empty load state when the state voltage signal is greater than the preset voltage signal.

[0082] It should be noted that when the load state in the microwave oven is different (such as when food is placed normally, no food is placed, or the moisture in the food being heated is too little, or the food or utensil is placed incorrectly), the field strength of the microwave signal detected by the working state determination module is also different. When the state voltage signal is greater than the preset voltage signal, it is determined that the current working state of the microwave oven is the no-load state, and corresponding solutions are adopted according to the detection result subsequently, such as reducing the microwave power to prevent damage to the microwave oven.

[0083] The magnetron temperature processing module 4 is used to determine the anode temperature data of the magnetron according to the anode voltage signal of the magnetron;

[0084] Specifically, as Figure 5 shown, the magnetron temperature processing module 4 includes:

[0085] The threshold processing unit 41 is used to determine the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron;

[0086] Among them, as Figure 6 shown, the threshold processing unit 41 includes:

[0087] The acquisition subunit 411 is used to acquire the anode voltage signal loaded at both ends of the magnetron, the equivalent resistance of the magnetron, and the output power of the frequency conversion power supply;

[0088] The threshold calculation subunit 412 is used to calculate the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron, the equivalent resistance of the magnetron, and the output power of the frequency conversion power supply.

[0089] It should be noted that the equivalent resistance R of the magnetron, the input power Pin of the frequency conversion power supply, and the power efficiency Eff are known. According to the output power calculation formula: Pout =

[0090] Pin * Eff, the required output power Pout of the frequency conversion power supply can be calculated. The anode voltage signal Ebm loaded at both ends of the magnetron can be collected through the voltage acquisition module, and this voltage acquisition module can be a conventional voltage acquisition circuit.

[0091] The anode threshold voltage VT of the magnetron can be calculated through the following formula:

[0092] Ebm = VT + R * It;

[0093] It = Po / Ebm;

[0094] Among them, \(I_t\) is the anode current of the magnetron. According to the above parameters and formulas, the current anode threshold voltage \(V_T\) of the magnetron can be calculated, so as to determine the anode temperature of the magnetron according to the anode threshold voltage subsequently.

[0095] The temperature processing unit 42 is configured to calculate the anode temperature data of the magnetron according to the anode threshold voltage of the magnetron.

[0096] It should be noted that according to the anode threshold voltage of the magnetron, query and pair with the preset voltage-temperature conversion table to obtain the anode temperature data corresponding to the anode threshold voltage. Among them, the preset voltage-temperature conversion table includes different anode threshold voltages and the anode temperature data corresponding to different anode threshold voltages.

[0097] The main control module 5 is configured to determine whether the current working state of the microwave oven is a preset non-empty load state, whether the working temperature data is less than or equal to the first preset temperature threshold, and whether the anode temperature data is less than or equal to the second preset temperature threshold. If the judgment is yes, then control the microwave oven to enter the fast heating working mode and start timing. Otherwise, control the microwave oven to enter the normal heating working mode; it is also configured to judge whether the fast heating duration of the microwave oven reaches the preset fast heating time threshold in the fast heating working mode. If the judgment is yes, then control the microwave oven to enter the normal heating working mode. If the judgment is no, continue to control the detection module, the working state determination module, and the magnetron temperature processing module to work.

[0098] It should be noted that when the current working state of the microwave oven is a non-empty load state, the working temperature data of the variable frequency power supply is less than or equal to the first preset temperature threshold, and the anode temperature data of the magnetron is less than or equal to the second preset temperature threshold, it means that the microwave oven is in a non-empty load device, and at the same time, the temperatures of each device are within the safe temperature range. At this time, the microwave oven can be controlled to enter the fast heating working mode and start timing. For example, the main control module of the microwave oven can send a power adjustment signal to the variable frequency power supply to make the variable frequency power supply increase the microwave output power of the magnetron, thereby improving the microwave heating efficiency of the microwave oven and meeting the user's fast heating requirements. When at least one of the above three judgment conditions cannot be met, the microwave oven is controlled to continue to maintain the normal heating working mode to avoid damage to the microwave oven and improve the use stability and safety of the microwave oven.

[0099] Preferably, for the fast heating working mode, a corresponding fast heating control button can also be set; when the user needs to use the fast heating working mode, a corresponding control signal can be input through the fast heating control button. The main control module in the microwave oven can execute the above working steps according to the control signal. If the fast heating working mode is not required, the main control module controls the microwave oven to enter the normal heating working mode due to the absence of a corresponding control signal.

[0100] To improve the safety of using a microwave oven, the present invention presets a corresponding rapid heating time threshold to avoid the temperature of the working components of the microwave oven being too high or the load on the working components being too high due to the microwave oven being in the rapid heating working mode for too long, which affects the service life of the working components and the microwave oven. When the rapid heating duration of the microwave oven reaches the preset rapid heating time threshold, the main control module controls the microwave oven to be in the normal heating working mode to improve the system safety of the microwave oven.

[0101] In summary, the present invention can automatically adjust the microwave oven to different heating modes according to the working state of the microwave oven and the temperature of the components to improve the heating efficiency. At the same time, it can effectively prevent the occurrence of situations such as the furnace cavity from sparking, burning out the furnace door and the magnetron and other devices due to the large microwave output power in the no-load state, ensuring the safety of the microwave oven components, and thus improving the stability of using the microwave oven.

[0102] Finally, it should be noted that the above embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions described in the foregoing embodiments or can easily think of changes, or perform equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for controlling rapid heating of a microwave oven, characterized in that, Including: S101, detecting in real time the microwave signal in the microwave oven body, the working temperature data of the frequency conversion power supply, and the anode voltage signal of the magnetron; S102, determining the current working state of the microwave oven according to the field strength of the microwave signal, wherein the working state includes a non-empty load state and an empty load state; S103, determining the anode temperature data of the magnetron according to the anode voltage signal of the magnetron; S104, judging whether the current working state of the microwave oven is a preset non-empty load state, whether the working temperature data is less than or equal to a first preset temperature threshold, and whether the anode temperature data is less than or equal to a second preset temperature threshold. If the judgment is yes, then control the microwave oven to enter the rapid heating working mode, start timing, and execute step S105. Otherwise, control the microwave oven to enter the normal heating working mode; S105, judging whether the rapid heating duration of the microwave oven reaches a preset rapid heating time threshold. If the judgment is yes, then control the microwave oven to enter the normal heating working mode. If the judgment is no, return to step S101.

2. The microwave oven rapid heating control method according to claim 1, characterized in that, The step of determining the current working state of the microwave oven according to the field strength of the microwave signal includes: According to the microwave signal, obtaining a state voltage signal corresponding to the field strength of the microwave signal; When the state voltage signal is greater than a preset voltage signal, then determining that the current working state of the microwave oven is an empty load state.

3. The microwave oven rapid heating control method according to claim 2, wherein The step of obtaining a state voltage signal corresponding to the field strength of the microwave signal according to the microwave signal includes: Obtaining the microwave signal and converting it into a state AC signal; Rectifying the state AC signal to obtain a state DC signal; Determining a state voltage signal corresponding to the field strength of the microwave signal according to the DC signal.

4. The rapid heating control method of a microwave oven according to claim 1, wherein, The step of determining the anode temperature data of the magnetron according to the anode voltage signal of the magnetron includes: Determining the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron; Calculating the anode temperature data of the magnetron according to the anode threshold voltage of the magnetron.

5. The microwave oven rapid heating control method according to claim 4, wherein The step of determining the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron includes: Obtaining the anode voltage signal applied across the magnetron, the equivalent resistance of the magnetron, and the output power of the frequency conversion power supply; Calculating the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron, the equivalent resistance of the magnetron, and the output power of the frequency conversion power supply.

6. A rapid heating control system for a microwave oven, characterized in that, Including: A detection module, for detecting in real time the microwave signal in the microwave oven body, the working temperature data of the frequency conversion power supply, and the anode voltage signal of the magnetron; A working state determination module, for determining the current working state of the microwave oven according to the field strength of the microwave signal, wherein the working state includes a non-empty load state and an empty load state; A magnetron temperature processing module, for determining the anode temperature data of the magnetron according to the anode voltage signal of the magnetron; The main control module is used to determine whether the current working state of the microwave oven is a preset non - empty load state, whether the working temperature data is less than or equal to the first preset temperature threshold, and whether the anode temperature data is less than or equal to the second preset temperature threshold. If the judgment is yes, it controls the microwave oven to enter the rapid heating working mode and starts timing; otherwise, it controls the microwave oven to enter the normal heating working mode. It is also used to judge whether the rapid heating duration of the microwave oven reaches the preset rapid heating time threshold in the rapid heating working mode. If the judgment is yes, it controls the microwave oven to enter the normal heating working mode; if the judgment is no, it continues to control the detection module, the working state determination module, and the magnetron temperature processing module to work.

7. The microwave oven rapid heating control system according to claim 6, wherein The working state determination module includes: A state voltage determination unit, which is used to obtain a state voltage signal corresponding to the field strength of the microwave signal according to the microwave signal; A state processing unit, which is used to determine that the current working state of the microwave oven is an empty load state when the state voltage signal is greater than the preset voltage signal.

8. The microwave oven rapid heating control system according to claim 7, wherein, The state voltage determination unit includes; A signal processing sub - unit, which is used to obtain the microwave signal and convert it into a state AC signal; A rectification processing sub - unit, which is used to rectify the state AC signal to obtain a state DC signal; A state voltage processing sub - unit, which determines the state voltage signal corresponding to the field strength of the microwave signal according to the DC signal.

9. The microwave oven rapid heating control system according to claim 6, characterized in that, The magnetron temperature processing module includes: A threshold processing unit, which is used to determine the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron; A temperature processing unit, which is used to calculate the anode temperature data of the magnetron according to the anode threshold voltage of the magnetron.

10. The microwave oven rapid heating control system according to claim 9, characterized in that, The threshold processing unit includes: An acquisition sub - unit, which is used to acquire the anode voltage signal loaded at both ends of the magnetron, the equivalent resistance of the magnetron, and the output power of the frequency conversion power supply; A threshold calculation sub - unit, which is used to calculate the anode threshold voltage of the magnetron according to the anode voltage signal of the magnetron, the equivalent resistance of the magnetron, and the output power of the frequency conversion power supply.

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