Magnetron, control method, control apparatus, appliance and storage medium

Abstract

A magnetron (10), a microwave appliance (1000), a control method, a control apparatus (200), a microwave cooking appliance (1000) and a storage medium. The magnetron (10) is used for the microwave appliance (1000). The magnetron (10) comprises a filament (131), wherein the wire diameter of the filament (131) is greater than or equal to 0.6 mm and less than or equal to 0.67 mm, and the filament (131) is configured to have a current greater than or equal to 8 A when the microwave appliance (1000) operates at an output power greater than or equal to 50 W.

Description

Magnetron, control method, control device, electrical components and storage medium

[0001] Priority information

[0002] This application claims priority and benefits to patent applications filed with the China National Intellectual Property Administration on November 29, 2024, with patent application numbers 202411745534.7 and 202411745540.2, the entire contents of which are incorporated herein by reference as if copied herein. Technical Field

[0003] This invention relates to the field of microwave electrical appliance technology, and more specifically, to a magnetron, a microwave electrical appliance, a control method, a control device, a microwave cooking appliance, and a storage medium. Background Technology

[0004] Currently, the lowest power setting of a microwave oven is still too high for heating foods with shells, defrosting foods, and fermenting foods, requiring the oven to use even lower power. However, the power of a microwave oven is controlled by the current in the magnetron. Further reducing the power would result in insufficient current in the magnetron, thus reducing the stability of the microwave output. Summary of the Invention

[0005] The present invention provides a magnetron and microwave appliance that can solve or improve the technical problem of unstable microwave output in microwave ovens when operating at low power due to insufficient current in the magnetron.

[0006] An embodiment of the present invention provides a magnetron for use in a microwave appliance. The magnetron includes a filament with a wire diameter greater than or equal to 0.6 mm and less than or equal to 0.67 mm, and the filament is configured such that when the microwave appliance operates at an output power greater than or equal to 50 watts, the current of the filament is greater than or equal to 8 amps.

[0007] Thus, by setting the diameter of the magnetron filament to between 0.6 mm and 0.67 mm, the filament diameter is increased compared to that of existing technologies. Without changing the filament length and resistivity, Ohm's law reduces the filament resistance, thereby increasing the magnetron current while keeping the voltage constant, and thus improving the stability of microwave output in the microwave oven.

[0008] In some embodiments, the filament has a length of 10.5 mm to 13.8 mm.

[0009] Thus, by setting the filament length to a value between 10.5 mm and 13.8 mm, it is possible to adapt the filament wire diameter and the size of the through hole.

[0010] In some embodiments, the outer diameter of the filament is 3.8 mm to 4.2 mm.

[0011] In this way, by setting the outer diameter of the filament to a value between 3.8 mm and 4.2 mm, it is possible to adapt the wire diameter of the filament and the size of the through hole.

[0012] In some embodiments, the filament pitch is 1 mm to 1.32 mm.

[0013] In this way, by setting the filament pitch to a value between 1 mm and 1.32 mm, it is possible to adapt the filament wire diameter and the size of the through hole.

[0014] In some embodiments, the magnetron includes an anode, a cathode, a first magnet, and a second magnet, the anode and the cathode being spaced apart and opposite each other, the cathode including a filament, and the anode, the filament, and the cathode being located between the first magnet and the second magnet.

[0015] In some embodiments, the anode is annular, and the cathode passes through a through-hole formed by the anode.

[0016] This can improve the working efficiency of the magnetron.

[0017] In some embodiments, the anode includes an anode cylinder and anode blades, the anode blades and the cathode are located in the anode cylinder, the anode blades are connected to the inner side of the anode cylinder, and a heat sink is connected to the outer side of the anode cylinder.

[0018] This allows for heat dissipation of the magnetron, ensuring its performance and extending its lifespan.

[0019] In some embodiments, the radiator includes a plurality of heat dissipation components arranged axially, each heat dissipation component including a cylindrical portion and a heat dissipation portion, the cylindrical portion being sleeved and connected to the anode cylinder, the heat dissipation portion being connected to the side of the cylindrical portion opposite to the anode cylinder, and the heat dissipation portion being bent.

[0020] This increases the heat dissipation area of ​​the radiator.

[0021] In some embodiments, the magnetron includes a duct component with an air duct inside, and the anode, the cathode, the first magnet, the second magnet, and the heat sink are located in the air duct. One end of the heat sink is connected to the anode cylinder, and the other end of the heat sink is connected to the side wall of the duct component facing the air duct.

[0022] This can further improve the heat dissipation efficiency of the magnetron.

[0023] The microwave appliance of the present invention includes the magnetron described in any of the above embodiments, and the frequency converter is electrically connected to the magnetron.

[0024] In some embodiments, the frequency converter includes a transformer, the transformer including a primary winding, a secondary winding and a filament winding, the secondary winding and the filament winding being magnetically coupled to the primary winding, the magnetron including an anode, the secondary winding being electrically connected to the anode, and the filament winding being electrically connected to the filament.

[0025] In some embodiments, the frequency converter includes a first insulated-gate bipolar transistor (IGBT), a second IGBT, a controller, a filter circuit, and a rectifier bridge. The first IGBT and the second IGBT are connected to the primary winding. The controller is configured to control the switching on and off of the first IGBT and the second IGBT to regulate the output power of the frequency converter. The filter circuit is used to maintain voltage stability in the frequency converter, and the rectifier bridge is used to convert the type of current input to the frequency converter.

[0026] The above embodiments provide a magnetron and microwave appliance in which the diameter of the magnetron filament is set to between 0.6 mm and 0.67 mm, which is larger than the filament diameter of the prior art. Without changing the filament length and resistivity, the resistance of the filament is reduced according to Ohm's law, thereby increasing the current of the magnetron while keeping the voltage constant, and thus improving the stability of microwave output in the microwave oven.

[0027] Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of the invention.

[0028] The present invention also provides a control method, control device, microwave cooking appliance, and computer-readable storage medium for heating shelled food, which can solve the problem of explosions that easily occur when microwave cooking appliances heat shelled food.

[0029] The control method for heating shelled food according to embodiments of the present invention is used in a microwave cooking appliance, the microwave cooking appliance including a cooking cavity and a microwave generator. The control method includes controlling the microwave generator to operate at a first microwave power to perform a first heating stage on the shelled food, the first microwave power being determined based on the initial surface temperature of the shelled food and the cavity temperature of the cooking cavity; when the surface temperature of the shelled food reaches a first set temperature, controlling the microwave generator to operate at a second microwave power to perform a second heating stage on the shelled food, the second microwave power being less than the first microwave power.

[0030] In this way, by monitoring the surface temperature of shelled food, the state of the shelled food during the heating process can be determined, and the microwave power of the microwave generator for heating the shelled food can be continuously adjusted according to the surface temperature. This can prevent the rapid generation of a large amount of steam inside the shelled food in a short period of time during the heating process, thereby avoiding the explosion of the shelled food during the heating process to a certain extent.

[0031] In some embodiments, controlling the microwave generator to operate at a second microwave power to perform a second heating stage on the shelled food when the surface temperature of the shelled food reaches a first set temperature includes controlling the microwave generator to stop operating for a preset time and then operate at the second microwave power again when the surface temperature of the shelled food reaches the first set temperature.

[0032] In this way, by controlling the microwave generator to stop working after the surface temperature of the shelled food reaches a certain level, and then resuming work after the preset food, the temperature of the shelled food can be lowered during the period when the microwave generator is not working, thus preventing the generation of a large amount of steam inside the shelled food in a short period of time, thereby preventing the shelled food from exploding.

[0033] In some embodiments, controlling the microwave generator to operate at a second microwave power to perform a second heating stage on the shelled food when the surface temperature of the shelled food reaches a first set temperature includes controlling the microwave generator to operate at a second microwave power to perform at least two second heating stages on the shelled food when the surface temperature of the shelled food reaches the first set temperature.

[0034] In this way, when the surface temperature of the shelled food reaches the preset value, by heating the shelled food in multiple heating stages and adjusting the power of the microwave generator during the switching of heating stages, the microwave generator can maintain a low heating power to heat the shelled food during the heating process, avoiding the generation of a large amount of steam inside the shelled food in a short period of time, thereby preventing the shelled food from exploding.

[0035] In some embodiments, when the surface temperature of the shelled food reaches the first set temperature, controlling the microwave generator to operate at a second microwave power to perform at least two second heating stages on the shelled food includes, during the execution of the previous second heating stage, when the surface temperature of the shelled food reaches the second set temperature, controlling the microwave generator to operate at the second microwave power to perform a next second heating stage on the shelled food, wherein the second set temperature is greater than the first set temperature, and the second set temperature of the next second heating stage is greater than the second set temperature of the previous second heating stage.

[0036] Thus, by controlling the microwave generator to operate at a second microwave power to perform the next second heating stage on the shelled food, and the second set temperature of the next second heating stage is greater than the second set temperature of the previous second heating stage, the temperature of the shelled food can be increased while preventing the shelled food from exploding.

[0037] In some implementations, the second set temperature ranges from 65 degrees Celsius to 75 degrees Celsius.

[0038] Thus, when the surface temperature of shelled food reaches 65 to 75 degrees Celsius, the food is almost cooked through. By adjusting the power of the microwave generator, the food can be prevented from being overheated, which would cause nutrient loss and affect the taste.

[0039] In some embodiments, during the execution of the previous second heating stage, when the surface temperature of the shelled food reaches the second set temperature, controlling the microwave generator to operate at the second microwave power to execute the next second heating stage on the shelled food includes, during the execution of the previous second heating stage, when the surface temperature of the shelled food reaches the second set temperature, controlling the microwave generator to stop operating for a preset time before executing the next second heating stage.

[0040] In this way, by controlling the microwave generator to stop working after the surface temperature of the shelled food reaches a certain level, and then resuming work after the preset food, the temperature of the shelled food can be lowered during the period when the microwave generator is not working, thus preventing the generation of a large amount of steam inside the shelled food in a short period of time, thereby preventing the shelled food from exploding.

[0041] In some implementations, the preset duration ranges from 3 seconds to 15 seconds.

[0042] Thus, by setting the preset duration for when the microwave generator stops working to a range of 3 to 15 seconds, the temperature of shelled food can be reduced to a level that will not cause an explosion. If the preset duration for when the microwave generator stops working is less than 3 seconds, the temperature of the shelled food will drop too little, which may easily cause an explosion. If the preset duration for when the microwave generator stops working is greater than 15 seconds, the temperature of the shelled food will drop too much, which will prolong the heating time and reduce the heating efficiency.

[0043] In some embodiments, the first microwave power ranges from 300 watts to 600 watts, the first set temperature ranges from 45 degrees Celsius to 60 degrees Celsius, and the second microwave power ranges from 50 watts to 200 watts.

[0044] Thus, by setting the microwave generator's power to 300 to 600 watts, heating efficiency can be improved while preventing the shelled food from exploding. When the surface temperature of the shelled food reaches 45 to 60 degrees Celsius, adjusting the microwave generator's power can prevent excessive heat from causing a large amount of steam to be generated inside the shell in a short time. By adjusting the microwave generator's power to 50 to 200 watts, the shelled food can be heated while preventing the rapid generation of a large amount of steam inside the shell, thereby preventing the shelled food from exploding.

[0045] In some embodiments, after the step of controlling the microwave generator to operate at a second microwave power to perform a second heating stage on the shelled food, the control method includes controlling the microwave generator to shut down so that the shell of the shelled food remains intact when the microwave generator heats the shelled food to a third set temperature at the second microwave power.

[0046] Thus, when the microwave generator heats the shelled food to the third set temperature at the second microwave power, the microwave generator is turned off. At this point, the shelled food is fully cooked. By turning off the microwave generator, the shelled food can be prevented from being overheated, thus avoiding nutrient loss and affecting the taste.

[0047] In some embodiments, the third set temperature ranges from 75 degrees Celsius to 82 degrees Celsius.

[0048] Thus, by heating shelled food to between 75 and 82 degrees Celsius, it can be determined that the shelled food is fully cooked and does not need to be heated further, thereby saving energy consumption and reducing costs.

[0049] The control device of the present invention is used in a microwave cooking appliance. The control device includes a processor and a memory. The memory stores a computer program. When the computer program is executed by the processor, it implements the steps of the control method for heating shelled food as described in any of the above embodiments.

[0050] The microwave cooking appliance of the present invention includes a control device, a microwave generator, and a cooking cavity. The control device is electrically connected to the microwave generator and is the control device described in the above embodiment.

[0051] The computer-readable storage medium of the present invention stores a computer program thereon, which, when executed by a processor, implements the steps of the control method for heating shelled food as described in any of the above embodiments.

[0052] Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of the invention. Attached Figure Description

[0053] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0054] Figure 1 is a schematic diagram of the structure of a microwave appliance according to some embodiments of the present invention;

[0055] Figure 2 is a schematic diagram of the structure of a magnetron according to some embodiments of the present invention;

[0056] Figure 3 is a schematic diagram of the filament structure in some embodiments of the present invention;

[0057] Figure 4 is a schematic diagram of the anode structure in some embodiments of the present invention;

[0058] Figure 5 is a schematic diagram of the structure of a transformer according to some embodiments of the present invention;

[0059] Figure 6 is a circuit diagram of the inverter connected to the magnetron in some embodiments of the present invention.

[0060] Explanation of the main component reference numerals in Figures 1 to 6: 100, Microwave electrical appliance; 10, Magnetron; 12, Anode; 121, Through hole; 122, Anode cylinder; 123, Anode blade; 13, Cathode; 131, Filament; 14, First magnet; 15, Second magnet; 17, Heat sink; 171, Heat sink component; 1711, Cylinder section; 1712, Heat sink section; 18, Air duct component; 181, Air duct; 20, Frequency converter; 21, Transformer; 211, Primary winding; 212, Secondary winding; 213, Filament winding; 22, First insulated gate bipolar transistor; 23, Second insulated gate bipolar transistor; 24, Controller; 25, Filter circuit; 26, Rectifier bridge.

[0061] Figure 7 is a flowchart illustrating a control method for heating shelled food according to certain embodiments of the present invention.

[0062] Figure 8 is a schematic diagram of the structure of a microwave cooking appliance according to some embodiments of the present invention;

[0063] Figure 9 is a line graph showing temperature versus power in some embodiments of the present invention;

[0064] Figure 10 is a schematic diagram of the control device according to some embodiments of the present invention;

[0065] Figure 11 is a flowchart illustrating a control method for heating shelled food according to certain embodiments of the present invention.

[0066] Figure 12 is another broken-line diagram of temperature and power in some embodiments of the present invention;

[0067] Figure 13 is a flowchart illustrating a control method for heating shelled food according to certain embodiments of the present invention.

[0068] Figure 14 is another schematic diagram of temperature versus power in some embodiments of the present invention;

[0069] Figure 15 is a flowchart illustrating a control method for heating shelled food according to certain embodiments of the present invention.

[0070] Figure 16 is a schematic diagram of the connection state of a computer-readable storage medium and a processor according to certain embodiments of the present invention.

[0071] Explanation of the reference numerals for the main components in Figures 7 to 16:

[0072] 1000. Microwave cooking appliance; 30. Microwave generator; 40. Cooking cavity; 50. Temperature sensor; 200. Control device; 210. Processor; 220. Memory; 221. Computer program; 300. Computer-readable storage medium. Detailed Implementation

[0073] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0074] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0075] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0076] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0077] This disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0078] Please refer to Figures 1, 2, and 3. An embodiment of the present invention, a magnetron 10, is used in a microwave appliance 100. The magnetron 10 includes a filament 131 with a wire diameter of 0.6 mm to 0.67 mm. The filament 131 is configured such that when the microwave appliance 100 operates at low output power, the current of the filament 131 is greater than or equal to 8 amps.

[0079] Thus, by setting the wire diameter of the filament 131 of the magnetron 10 to between 0.6 mm and 0.67 mm, the wire diameter of the filament 131 is increased compared to that of the prior art. Without changing the length and resistivity of the filament 131, Ohm's law makes the resistance of the filament 131 smaller, thereby increasing the current of the magnetron 10 while keeping the voltage constant, and thus improving the stability of microwave output in the microwave oven.

[0080] The microwave appliance 100 can be a device that generates microwave energy to heat food. For example, the microwave appliance 100 can be a microwave oven, a microwave-steam-grill combo, a microwave oven, an integrated stove, etc. The microwave appliance 100 includes a magnetron 10, which acts as a microwave generator. The magnetron 10 converts the direct current energy flowing through it into microwave energy oscillations. This microwave energy is then transmitted through a waveguide to the inner cavity of the oven. Upon encountering polar molecules in the food (such as water, fat, and protein), it vibrates at extremely high speeds, generating frictional heat and thus heating the food.

[0081] Specifically, the magnetron 10 includes a filament 131, which can be made of thorium-tungsten wire or pure tungsten wire. This improves the conductivity and high-temperature resistance of the filament 131. The filament 131 is spirally installed within the magnetron 10. This spiral shape helps increase the heating area of ​​the filament 131, improving heating efficiency and allowing the filament 131 to uniformly heat the components within the magnetron 10. Thus, when the magnetron 10 is in operation, current can flow through the filament 131, generating heat to heat other components within the magnetron 10.

[0082] As shown in Figure 2, while keeping the length and outer diameter of the filament 131 in the magnetron 10 constant, increasing the wire diameter of the filament 131 will, according to the law of resistance, reduce its resistance because the resistivity and length of the filament 131 remain constant while the cross-sectional area increases. Furthermore, according to Ohm's law, the decrease in the resistance of the filament 131, under the same voltage, leads to an increase in the current flowing through the filament 131.

[0083] The pitch N of the filament 131 can be set from 1 mm to 1.32 mm, so that when the voltage of the input magnetron 10 is 220 volts, the current flowing through the filament 131 can be controlled to be greater than or equal to 8 amps.

[0084] In some examples, as shown in Figure 3, the wire diameter D of filament 131 is 0.6 mm, 0.62 mm, 0.64 mm, 0.67 mm, 0.68 mm, or other values ​​between 0.6 mm and 0.67 mm. Thus, by setting the wire diameter of filament 131 to a value between 0.6 mm and 0.67 mm, the wire diameter of filament 131 is increased, and without changing other parameters of filament 131, the resistance of filament 131 is decreased, thereby increasing the current to filament 131.

[0085] In some examples, as shown in Figure 3, the outer diameter M of the filament 131 is 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, or other values ​​between 3.8 mm and 4.2 mm. Thus, by setting the outer diameter of the filament 131 to a value between 3.8 mm and 4.2 mm, the wire diameter of the filament 131 and the size of the through-hole 121 can be adapted.

[0086] In some examples, as shown in Figure 3, the pitch N of the filament 131 is 1 mm, 1.15 mm, 1.2 mm, 1.25 mm, 1.32 mm, or other values ​​between 1 mm and 1.32 mm. Thus, by setting the pitch of the filament 131 to a value between 1 mm and 1.32 mm, the wire diameter of the filament 131 and the size of the through-hole 121 can be adapted.

[0087] In some examples, as shown in Figure 3, the length L of the filament 131 is 10.5 mm, 11 mm, 11.2 mm, 11.5 mm, 12 mm, 12.5 mm, 13.5 mm, 13.8 mm, or other values ​​between 10.5 mm and 13.8 mm. Thus, by setting the length of the filament 131 to a value between 10.5 mm and 13.8 mm, the wire diameter of the filament 131 and the size of the through-hole 121 can be adapted.

[0088] Referring to Figure 2, in some embodiments, the magnetron 10 includes an anode 12, a cathode 13, a first magnet 14, and a second magnet 15. The anode 12 and the cathode 13 are spaced apart and opposite each other. The filament 131 is arranged around the cathode 13. The anode 12, the filament 131, and the cathode 13 are located between the first magnet 14 and the second magnet 15.

[0089] Specifically, the magnetron 10 includes an anode 12, a cathode 13, a first magnet 14, and a second magnet 15. The anode 12 can be made of a highly conductive metal, for example, oxygen-free copper. The cathode 13 can be made of a material with high conductivity, good oxidation resistance, and high thermal stability, for example, tungsten oxide, tungsten wire, or a thorium-tungsten alloy. The anode 12 and cathode 13 are spaced apart and form an interaction space.

[0090] In the embodiment shown in Figure 2, the first magnet 14 is the upper magnet, and the second magnet 15 is the lower magnet. Both the first magnet 14 and the second magnet 15 are electromagnets. In one embodiment, the first magnet 14 is a permanent magnet, and the second magnet 15 is an electromagnet. In another embodiment, the first magnet 14 is an electromagnet, and the second magnet 15 is a permanent magnet.

[0091] The working principle of the magnetron 10 is as follows: When the magnetron 10 is working, as shown in Figure 1, a DC voltage (such as a DC voltage of several kilovolts) is applied between the cathode 13 and the anode 12. Simultaneously, the first magnet 14 and the second magnet 15 provide a magnetic field to the interaction space. The DC electric field and DC magnetic field within the interaction space are perpendicular to each other. Electrons are emitted from the cathode 13. These electrons are accelerated by the electric field and deflected by the magnetic field, resulting in stable oscillating motion within the interaction space. The electron velocity is proportional to the ratio E / B, where E is the electric field strength and B is the magnetic flux density. The energy gained from the electric field in the interaction space by the electron stream emitted from the cathode 13 is transferred to a high-frequency field under certain conditions and output as microwaves through the energy output window.

[0092] When the first magnet 14 and the second magnet 15 are electromagnets, a magnetic field can be provided by energizing the first magnet 14 and the second magnet 15 (which can be a constant voltage or constant current source). By adjusting the electrical signal parameters of the electromagnets (such as operating voltage or operating current), the central magnetic field of the magnetron 10 can be adjusted. In conjunction with adjusting the high voltage power supply of the magnetron 10, the output power of the magnetron 10 can be adjusted between zero and the maximum power (for example, if the maximum operating current of the electromagnet is I, the maximum central magnetic field is B, the electric field is E, and the maximum output power is mW, then the output power of the magnetron 10 can be adjusted between 0W and mW). The relationship between the electrical signal parameters of the electromagnet, the central magnetic field, the electric field, and the output power can be pre-calibrated and stored in the microwave appliance 100 through simulation, testing, etc. Correspondingly, the relationship between the electrical signal parameters of the electromagnet, the voltage of the anode 12, the current of the cathode 13, and the output power can also be pre-calibrated and stored in the microwave appliance 100 through simulation, testing, etc. By setting the output power of the magnetron 10, the combination of the electromagnet's electrical signal parameters, the voltage of the anode 12, and the current of the cathode 13 can be obtained through the above relationship, thus obtaining the output power of the set magnetron 10.

[0093] Please refer to Figure 4. In some embodiments, the anode 12 is annular, and the cathode 13 passes through the through hole 121 formed by the anode 12.

[0094] This can improve the working efficiency of the magnetron 10.

[0095] Specifically, the annular anode 12 has a through hole 121 in the middle, and the cathode 13 passes through the through hole 121, so that the cathode 13 is opposite to the anode 12 at 0 degrees in the circumferential direction. The relative area between the anode 12 and the cathode 13 is large. When the magnetron 10 is working, the cathode 13 can emit electrons at 0 degrees in the circumferential direction, so that the cathode 13 emits more electrons, which can improve the working efficiency of the magnetron 10.

[0096] Please refer to Figure 2 again. In some embodiments, the anode 12 includes an anode cylinder 122 and an anode blade 123. The anode blade 123 and the cathode 13 are located in the anode cylinder 122. The anode blade 123 is connected to the inner side of the anode cylinder 122, and a heat sink 17 is connected to the outer side of the anode cylinder 122.

[0097] In this way, the magnetron 10 can be cooled, ensuring its working performance and extending its service life.

[0098] Specifically, because the magnetron 10 has a high output power and generates a lot of heat, the anode 12 will have a high temperature rise. The high temperature rise will seriously affect the working performance and service life of the magnetron 10. Therefore, it is necessary to cool down the magnetron 10.

[0099] The anode 12 includes an anode cylinder 122 and an anode blade 123. The anode cylinder 122 has a receiving cavity, allowing the anode blade 123 and cathode 13 to be mounted in the anode cylinder 122 and connected to the anode 12 via an insulating support. The anode cylinder 122 can also be connected to a heat sink 17. The heat from the anode 12 and cathode 13 can be transferred to the heat sink 17 for dissipation, ensuring the magnetron 10 operates within its normal temperature range, guaranteeing its performance, and extending its lifespan. The heat sink 17 can be air-cooled, water-cooled, or a combination of both; no specific limitation is made here.

[0100] The present invention does not specifically limit the material of the heat sink 17. In one example, the heat sink 17 may be made of copper, aluminum or aluminum alloy.

[0101] Referring to Figure 2, in some embodiments, the radiator 17 includes a plurality of heat dissipation components 171 arranged along the axial direction. Each heat dissipation component 171 includes a cylindrical portion 1711 and a heat dissipation portion 1712. The cylindrical portion 1711 is sleeved and connected to the anode cylinder 122, and the heat dissipation portion 1712 is connected to the side of the cylindrical portion 1711 away from the anode cylinder 122. The heat dissipation portion 1712 is bent.

[0102] This increases the heat dissipation area of ​​the radiator 17.

[0103] Specifically, on the one hand, multiple heat dissipation components 171 can be arranged sequentially along the axial direction of the anode cylinder 122. Multiple cylindrical portions 1711 are sleeved on and connected to the anode cylinder 122 along its axial direction, such that a larger surface area of ​​the anode cylinder 122 is connected to the cylindrical portions 1711, increasing the heat transfer area between the anode cylinder 122 and the cylindrical portions 1711. In Figure 1, the axial direction of the anode cylinder 122 is parallel to the axial direction of the cylindrical portions 1711, and both the axial directions of the anode cylinder 122 and the cylindrical portions 1711 are in the vertical direction. The number of heat dissipation components 171 is five. It is understood that the present invention does not specifically limit the number of heat dissipation components 171.

[0104] On the other hand, the heat dissipation section 1712 is connected to the side of the cylindrical section 1711 away from the anode cylinder 122. The heat from the anode 12 can be transferred to the anode cylinder 122, which can then transfer heat to the cylindrical section 1711, which in turn can transfer heat to the heat dissipation section 1712. The bent shape of the heat dissipation section 1712 increases the heat dissipation area of ​​the radiator 17. Moreover, during the heat transfer process, a portion of the heat is also dissipated.

[0105] In summary, the structure of the heat sink 17 increases the heat dissipation area of ​​the heat sink 17, further ensuring the working performance of the magnetron 10 and extending its service life.

[0106] The heat dissipation portion 1712 may have at least one bend. In Figure 1, there are 5 heat dissipation components 171, some of which have 3 bends in their heat dissipation portion 1712, and some of which have 4 bends in their heat dissipation portion 1712.

[0107] Please refer to Figure 2. In some embodiments, the magnetron 10 includes a duct component 18, which has a duct 181. The anode 12, cathode 13, first magnet 14, second magnet 15 and heat sink 17 are located in the duct 181. One end of the heat sink 17 is connected to the anode cylinder 122, and the other end of the heat sink 17 is connected to the side wall of the duct component 18 facing the duct 181.

[0108] This can further improve the heat dissipation efficiency of the magnetron 10.

[0109] Specifically, an air duct 181 is formed within the air duct component 18. Cool air blown out by the fan can enter the air duct 181 from one side and flow out of the air duct 181 from the other side. Since the main heat-generating components of the magnetron 10—the anode 12 and the electromagnet—are located in the air duct 181, the heat from these components can be dissipated into the air duct 181 by the heat sink 17 and then carried away by the cool air within the air duct 181. At the same time, the heat from these components can also be directly carried away by the cool air, which can further improve the heat dissipation efficiency of the magnetron 10.

[0110] One end of the radiator 17 is connected to the anode cylinder 122, and the other end of the radiator 17 is connected to the side wall of the air duct component 18 facing the air duct 181. In addition to improving the structural strength of the air duct component 18, the air duct component 18 is usually made of metal. The radiator 17 can also transfer heat to the air duct component 18. The heat can be dissipated from the surface of the air duct component 18, increasing the heat dissipation area and further improving the heat dissipation efficiency of the magnetron 10.

[0111] Referring to Figure 5, in some embodiments, the frequency converter 20 includes a transformer 21, which includes a primary winding 211, a secondary winding 212, and a filament winding 213. The secondary winding 212 and the filament winding 213 are magnetically coupled to the primary winding 211. The magnetron 10 includes an anode 12, the secondary winding 212 is electrically connected to the anode 12, and the filament winding 213 is electrically connected to the filament 131.

[0112] Specifically, the microwave appliance 100 also includes a frequency converter 20. By adjusting the output frequency and power of the frequency converter 20, the microwave appliance 100 can achieve precise control of its heating power. The frequency converter 20 includes a transformer 21, which converts the high voltage input to the frequency converter 20 into a stable voltage suitable for it. The transformer 21 includes a primary winding 211, a secondary winding 212, and a filament winding 213. The magnetic field of the secondary winding 212 can couple with the magnetic field of the primary winding 211, so that when the current in the primary winding 211 changes, an electromotive force is generated in the secondary winding 212. Similarly, the magnetic field of the filament winding 213 can couple with the magnetic field of the primary winding 211, so that when the current in the primary winding 211 changes, an electromotive force is generated in the filament winding 213.

[0113] The primary winding 211 can receive the current from the input transformer 21, and when the current flows through the primary winding 211, it causes the primary winding 211 to generate an alternating magnetic field.

[0114] The secondary winding 212 can induce a voltage in the alternating magnetic field generated by the primary winding 211 through the principle of electromagnetic induction, and the secondary winding 212 can be connected to the anode 12 of the magnetron 10, so that the secondary winding 212 can provide the voltage required by the anode 12 of the magnetron 10.

[0115] The filament winding 213 can be connected to the filament 131 in the magnetron 10 and can supply voltage to the filament 131. The filament winding 213 is located between the primary winding 211 and the secondary winding 212, so that the filament winding 213 can be located as close as possible in the magnetic circuit of the alternating magnetic field generated by the primary winding 211, thereby reducing the leakage flux of the filament winding 213 and increasing the magnetic flux through the filament winding 213. Under the principle of magnetic induction, the voltage generated by the filament winding 213 can be increased, thereby increasing the current supplied to the filament 131 in the magnetron 10.

[0116] Referring to Figure 6, in some embodiments, the frequency converter 20 includes a first insulated-gate bipolar transistor 22, a second insulated-gate bipolar transistor 23, a controller 24, a filter circuit 25, and a rectifier bridge 26. The first insulated-gate bipolar transistor 22 and the second insulated-gate bipolar transistor 23 are connected to the primary winding 211. The controller 24 is configured to control the on and off of the first insulated-gate bipolar transistor 22 and the second insulated-gate bipolar transistor 23 to regulate the output power of the frequency converter 20. The filter circuit 25 is used to maintain voltage stability in the frequency converter 20, and the rectifier bridge 26 is used to convert the type of current input to the frequency converter 20.

[0117] Specifically, the frequency converter 20 also includes a first insulated-gate bipolar transistor (IGBT) 22, a second insulated-gate bipolar transistor (IGBT) 23, a controller 24, a rectifier bridge 26, and a filter circuit 25. The first IGBT 22 and the second IGBT 23 can be connected to the controller 24, and their on / off states can be controlled by adjusting the gate voltage. When the gate voltage is greater than the threshold voltage, the IGBT is in the on state; when the gate voltage is less than the threshold voltage, the IGBT is in the off state.

[0118] The controller 24 can be a microcontroller 24 or a digital signal processor. The controller 24 can quickly turn the circuit on and off by controlling the first insulated gate bipolar transistor 22 and the second insulated gate bipolar transistor 23, thereby precisely controlling the voltage and frequency of the output inverter 20 so that the inverter 20 can maintain a certain current. In this way, the inverter 20 can provide a more stable power supply to the magnetron 10 for operation.

[0119] The rectifier bridge 26 converts the input AC power into DC power, providing the required DC voltage for the filter circuit 25 and the transformer 21. The rectifier bridge 26 is typically composed of multiple rectifier diodes, forming a full-bridge rectifier circuit.

[0120] The filter circuit 25 is located after the rectifier circuit. It is mainly used to eliminate the high-order harmonic components in the pulsating DC voltage output by the rectifier circuit, making the DC voltage smoother, and providing a stable DC power supply for the transformer 21.

[0121] In related technologies, microwave ovens can be used to heat or cook food. However, microwave ovens are generally not suitable for heating eggs. Because eggshells are airtight, microwaving eggs can easily cause a large amount of steam to be generated inside the egg in a short period of time, increasing the pressure and potentially causing an explosion.

[0122] Specifically, with the application of microwave heating technology, the microwave cooking appliance industry has emerged and developed rapidly. Today, using microwave cooking appliances to heat or cook food has become a common practice in households both in China and abroad, such as heating milk, boiling sweet potatoes, or cooking noodles. However, heating shelled foods remains a challenge for microwave ovens.

[0123] Because shelled foods are not airtight, when heated, they generate steam inside, increasing pressure and potentially leading to an explosion—a very dangerous situation. Furthermore, microwave cooking appliances generally have high microwave power and feature overall heating; therefore, when heating shelled foods, they generate a large amount of steam inside the food in a short time, causing a rapid increase in pressure and potentially resulting in an explosion.

[0124] To address the aforementioned technical problems, this invention provides a control method for heating shelled food ingredients.

[0125] Please refer to Figures 7 to 10. The control method for heating shelled food according to an embodiment of the present invention is used in a microwave cooking appliance 1000. The microwave cooking appliance 1000 includes a cooking cavity 40 and a microwave generator 30. The control method includes:

[0126] Step 011: Control the microwave generator 30 to operate at a first microwave power to perform a first heating stage on the shelled food. The first microwave power is determined based on the initial surface temperature of the shelled food and the oven cavity temperature of the cooking cavity 40.

[0127] Step 012: When the surface temperature of the shelled food reaches the first set temperature, control the microwave generator 30 to operate at the second microwave power to perform the second heating stage on the shelled food. The second microwave power is less than the first microwave power.

[0128] In this way, by monitoring the surface temperature of the shelled food, the state of the shelled food during the heating process can be determined, and the microwave power of the microwave generator 30 for heating the shelled food can be continuously adjusted according to the surface temperature. This can prevent the rapid generation of a large amount of steam inside the shelled food in a short period of time during the heating process, thereby avoiding the explosion of the shelled food during the heating process to a certain extent.

[0129] The microwave cooking appliance 1000 can be a microwave oven, a microwave oven-oven combination, or a microwave steam-oven combination, or other devices that use microwaves to heat food. The microwave cooking appliance 1000 described in this application is an example of a microwave oven.

[0130] The microwave cooking appliance 1000 includes a microwave generator 30 and a cooking cavity 40. The microwave generator 30 includes, but is not limited to, a magnetron, a solid-state generator, and a radio frequency module. After the food is placed in the cooking cavity 40, microwaves are emitted from the microwave generator 30 onto the food, and the food is heated by the microwave energy.

[0131] For example, a microwave cooking appliance 1000 may include a power supply, a cooking cavity 40, and an electrical chamber, while a microwave generator 30 may include a magnetron and a frequency converter. During operation, the frequency converter in the electrical chamber controls different output powers by changing the power supply frequency, supplying power to the magnetron in the electrical chamber. The magnetron continuously generates microwaves, which are then transmitted sequentially through a waveguide and a stirring antenna in the electrical chamber to the cooking cavity 40, heating the food within the cooking cavity 40.

[0132] The microwave cooking appliance 1000 is equipped with a control device 200 for controlling the heating of shelled food. The control device 200 includes a processor 210, a memory 220, and a computer program 221. The computer program 221 is stored in the memory 220 and executed by the processor 210. The computer program 221 includes steps for performing a control method for heating shelled food.

[0133] Specifically, when shelled food is placed in the cooking cavity 40 of the microwave cooking appliance 1000 for heating, the processor 210 can determine the first microwave power for heating the shelled food in the first heating stage based on the initial surface temperature of the shelled food and the cavity temperature of the cooking cavity 40. For example, as shown in Figure 9, the first heating stage can be a [0, Ta] heating stage, and the first microwave power of the first heating stage [0, Ta] can be P0. It should be noted that the shelled food can be eggs, duck eggs, or other egg-like foods. The initial surface temperature of the shelled food refers to the surface temperature of the shell when the shelled food is placed in the cooking cavity 40 without being heated. For example, when the shelled food is placed in a natural environment, the initial surface temperature of the shelled food is 20 degrees Celsius; when the shelled food is placed in a freezing environment such as a refrigerator, the initial surface temperature of the shelled food is 5 degrees Celsius. The first heating stage is the time period required to heat the shelled food to a first set temperature based on its surface temperature, and the first set temperature is a temperature preset in the memory 220 of the microwave cooking appliance 1000.

[0134] The processor 210 acquires the initial surface temperature of the shelled food and the cavity temperature of the cooking cavity 40 by installing a temperature sensor 50 in the microwave cooking appliance 1000. When the shelled food is placed in the cooking cavity 40 and the microwave cooking appliance 1000 is powered on, the temperature sensor 50 can collect the initial surface temperature of the shelled food and the cavity temperature of the cooking cavity 40. Based on the comparison between the collected initial surface temperature and cavity temperature and the temperature-power table pre-set in the memory 220 of the microwave cooking appliance 1000, the processor 210 can obtain the first microwave power for the first heating stage. When there are multiple shelled foods, the highest surface temperature of the shelled food is collected as the initial surface temperature.

[0135] When the surface temperature of the shelled food reaches a first set temperature by heating it with a first microwave power, the processor 210 can control the microwave generator 30 to reduce the heating power and heat the shelled food with a second microwave power to perform a second heating stage. The second microwave power is less than the first microwave power. Therefore, compared to the prior art where heating shelled food with the same power can easily lead to an explosion, changing the first microwave power of the microwave generator 30 to the second microwave power reduces the rate at which the shelled food generates steam, thus preventing the generation of a large amount of steam in a short time and avoiding an explosion. For example, as shown in Figure 9, the first set temperature can be Ta, the second heating stage can be a [Ta, Tt] heating stage, and the second microwave power of the second heating stage can be P1 or P2.

[0136] In some implementations, the first microwave power can be in the range of 300 watts to 600 watts. For example, the first microwave power can be any value among 300 watts, 350 watts, 400 watts, 450 watts, 500 watts, 550 watts, 600 watts, or any value among 300 watts to 600 watts.

[0137] The first set temperature range is 45 degrees Celsius to 60 degrees Celsius. For example, the first set temperature can be any value of 45 degrees Celsius, 48 ​​degrees Celsius, 50 degrees Celsius, 55 degrees Celsius, 60 degrees Celsius, or any value of 45 degrees Celsius to 60 degrees Celsius.

[0138] The second microwave power is between 50 watts and 200 watts. For example, the second microwave power can be any value between 50 watts, 80 watts, 100 watts, 120 watts, 150 watts, 180 watts, 200 watts, or between 50 watts and 200 watts.

[0139] Thus, by setting the microwave power of the microwave generator 30 to 300 watts to 600 watts, heating efficiency can be improved while preventing the shelled food from exploding. When the surface temperature of the shelled food reaches 45 to 60 degrees Celsius, adjusting the power of the microwave generator 30 can prevent excessive heat from causing a large amount of steam to be generated inside the shell in a short time. By adjusting the power of the microwave generator 30 to 50 to 200 watts, the shelled food can be heated while preventing the generation of a large amount of steam inside the shelled food in a short time, thereby preventing the shelled food from exploding.

[0140] Please refer to Figures 11 and 12. In some embodiments, step 012: when the surface temperature of the shelled food reaches a first set temperature, the microwave generator 30 is controlled to operate at a second microwave power to perform a second heating stage on the shelled food, including:

[0141] Step 0121: When the surface temperature of the shelled food reaches the first set temperature, control the microwave generator 30 to stop working for a preset time and then work at the second microwave power.

[0142] In this way, by controlling the microwave generator 30 to stop working after the surface temperature of the shelled food reaches a certain level, and then resuming work after the preset food, the temperature of the shelled food can be lowered during the period when the microwave generator 30 is not working, thus preventing the generation of a large amount of steam inside the shelled food in a short period of time, thereby preventing the shelled food from exploding.

[0143] Specifically, as shown in Figure 11, after heating the surface temperature of the shelled food to a first set temperature using the first microwave power, the processor 210 can control the microwave generator 30 to stop working for a preset time before heating the shelled food again with the second microwave power to execute the second heating stage. The second microwave power is less than the first microwave power. Therefore, compared to the prior art where heating shelled food with the same power can easily cause an explosion, by heating the shelled food to the first preset temperature with the first microwave power and then stopping heating, the temperature of the shelled food is maintained at or lowered to the first preset temperature. This reduces the rate at which the shelled food generates steam, preventing the generation of a large amount of steam in a short time that could cause an explosion. Then, after the preset heating time has elapsed, the processor 210 controls the microwave generator 30 to heat with the second microwave power, allowing the shelled food to enter the second heating stage and continue heating until cooked. For example, as shown in Figure 12, the first heating stage can be the [0, Ta] heating stage, the first microwave power of the first heating stage [0, Ta] can be P0, the preset duration can be t1, and the first set temperature can be Ta. The second heating stage can be the [Ta, Tt] heating stage, and the second microwave power of the second heating stage can be P1 or P2.

[0144] In some implementations, the preset duration ranges from 3 seconds to 15 seconds. For example, the preset duration can be any value between 3 seconds, 5 seconds, 7 seconds, 9 seconds, 11 seconds, 13 seconds, 15 seconds, or 3 seconds to 15 seconds.

[0145] Thus, by setting the preset duration for which the microwave generator 30 stops working to a range of 3 to 15 seconds, the temperature of shelled food can be reduced to a temperature that will not explode. When the preset duration for which the microwave generator 30 stops working is less than 3 seconds, the temperature of the shelled food drops too little, which may easily cause an explosion. When the preset duration for which the microwave generator 30 stops working is greater than 15 seconds, the temperature of the shelled food drops too much, which prolongs the heating time and reduces the heating efficiency.

[0146] Please refer to Figures 12 and 13. In some embodiments, step 012: when the surface temperature of the shelled food reaches a first set temperature, the microwave generator 30 is controlled to operate at a second microwave power to perform a second heating stage on the shelled food, including:

[0147] Step 0122: When the surface temperature of the shelled food reaches the first set temperature, control the microwave generator 30 to operate at the second microwave power to perform at least two second heating stages on the shelled food.

[0148] Thus, when the surface temperature of the shelled food reaches the preset value, by heating the shelled food in multiple heating stages and adjusting the power of the microwave generator 30 during the switching of heating stages, the microwave generator 30 can maintain a relatively low heating power to heat the shelled food during the heating process, avoiding the generation of a large amount of steam inside the shelled food in a short period of time, thereby preventing the shelled food from exploding.

[0149] Specifically, after heating the surface temperature of the shelled food to a first set temperature using the first microwave power, the processor 210 can control the microwave generator 30 to heat the shelled food with a second microwave power to perform at least two second heating stages. Multiple second heating stages can be preset in the memory 220 of the microwave cooking appliance 1000, and the specific number of second heating stages can be selected according to user instructions. Multiple second heating stages can reduce the efficiency of steam generation inside the shelled food, preventing the shelled food from exploding due to excessive steam generation in a short period.

[0150] As shown in Figure 12, the second heating stage may include multiple heating stages, which are not limited here, and the second microwave power of each heating stage is different. For example, as shown in Figure 11, the second heating stage may include two heating stages [Ta, tb] and [Tb, Tt], and the second microwave power P1 of the heating stage [Ta, tb] is greater than the second microwave power P2 of the heating stage [Tb, Tt].

[0151] Please refer to Figure 12. In some embodiments, step 0122: When the surface temperature of the shelled food reaches the first set temperature, the microwave generator 30 is controlled to operate at the second microwave power to perform at least two second heating stages on the shelled food. This includes, during the execution of the previous second heating stage, when the surface temperature of the shelled food reaches the second set temperature, the microwave generator 30 is controlled to operate at the second microwave power to perform the next second heating stage on the shelled food. The second set temperature is greater than the first set temperature, and the second set temperature of the next second heating stage is greater than the second set temperature of the previous second heating stage.

[0152] Thus, by controlling the microwave generator 30 to operate at a second microwave power to perform the next second heating stage on the shelled food, and the second set temperature of the next second heating stage is greater than the second set temperature of the previous second heating stage, the temperature of the shelled food can be increased while preventing the shelled food from exploding.

[0153] Specifically, based on user instructions, the processor 210 can determine the number of second heating stages. During the execution of the previous second heating stage, if the processor 210 detects that the surface temperature of the shelled food has reached a second set temperature, the processor 210 can control the microwave generator 30 to operate at a second microwave power to heat the shelled food, thus executing the next second heating stage. The second set temperature is higher than the first set temperature, and the second set temperature of the next second heating stage is higher than the second set temperature of the previous second heating stage.

[0154] For example, as shown in Figure 12, the processor 210 can determine that the number of second heating stages is two according to the user's instructions. When the first second heating stage [Ta, tb] is heated to the second set temperature Tb of the first second heating stage [Ta, tb] with the second microwave power P1, the processor 210 controls the microwave generator 30 to heat to the second set temperature Tt of the next second heating stage [Tb, Tt] with the second microwave power P2. Here, the second set temperature Tb of the first second heating stage is less than the second set temperature Tt of the second second heating stage.

[0155] In some implementations, the second set temperature ranges from 65 degrees Celsius to 75 degrees Celsius. For example, the second set temperature can be any value among 65 degrees Celsius, 67 degrees Celsius, 69 degrees Celsius, 71 degrees Celsius, 73 degrees Celsius, 75 degrees Celsius, or any value among 65 degrees Celsius and 75 degrees Celsius.

[0156] Thus, when the surface temperature of the shelled food reaches 65 to 75 degrees Celsius, the shelled food is almost cooked through. By adjusting the power of the microwave generator 30, the shelled food can be prevented from being overheated, resulting in nutrient loss and affecting the taste.

[0157] Please refer to Figure 14. In some embodiments, during the execution of the previous second heating stage, when the surface temperature of the shelled food reaches the second set temperature, the microwave generator 30 is controlled to operate at the second microwave power to execute the next second heating stage on the shelled food. This includes controlling the microwave generator 30 to stop operating for a preset time after the surface temperature of the shelled food reaches the second set temperature during the execution of the previous second heating stage before executing the next second heating stage.

[0158] In this way, by controlling the microwave generator 30 to stop working after the surface temperature of the shelled food reaches a certain level, and then resuming work after the preset food, the temperature of the shelled food can be lowered during the period when the microwave generator 30 is not working, thus preventing the generation of a large amount of steam inside the shelled food in a short period of time, thereby preventing the shelled food from exploding.

[0159] Specifically, during the execution of the previous second heating stage, when the surface temperature of the shelled food reaches the second set temperature, the processor 210 can control the microwave generator 30 to stop working for a preset time before executing the next second heating stage.

[0160] For example, as shown in Figure 14, after the processor 210 completes the first second heating stage [Ta, tb] with the second microwave power P1, raising the surface temperature of the shelled food to the second set temperature Tb of the first second heating stage [Ta, tb], the processor 210 can control the microwave generator 30 to stop working for a preset time, so that the surface temperature of the shelled food is maintained at the second set temperature Tb or lowered below the second set temperature Tb. Then, the processor 210 controls the microwave generator 30 to heat the food to the second set temperature Tt with the second microwave power P2 of the next second heating stage [Tb, Tt].

[0161] Referring to Figures 12 and 15, in some embodiments, after step 012: controlling the microwave generator 30 to operate at a second microwave power to perform a second heating stage on the shelled food, the control method includes:

[0162] Step 013: When the microwave generator 30 heats the shelled food to the third set temperature at the second microwave power, control the microwave generator 30 to turn off so that the shell of the shelled food remains intact.

[0163] Thus, when the microwave generator 30 heats the shelled food to the third set temperature at the second microwave power, the microwave generator 30 is turned off. At this time, the shelled food is fully cooked. By turning off the microwave generator 30, the shelled food can be prevented from being overheated, thus avoiding nutrient loss and affecting the taste.

[0164] Specifically, when the microwave generator 30 heats the shelled food to a third set temperature using a second microwave power, the shelled food has already been microwave-heated and cooked. Therefore, the processor 210 can control the microwave generator 30 to shut down to keep the shell of the food intact. For example, as shown in Figure 12, the third set temperature can be Tt. After heating to the third set temperature Tt using the second microwave power P2 [Tb, Tt] in the second heating stage, the processor 210 can control the microwave generator 30 to stop working.

[0165] In some implementations, the third set temperature ranges from 75 degrees Celsius to 82 degrees Celsius. For example, the third set temperature can be any value among 75 degrees Celsius, 76 degrees Celsius, 77 degrees Celsius, 78 degrees Celsius, 79 degrees Celsius, 82 degrees Celsius, or 75 degrees Celsius and 82 degrees Celsius.

[0166] Thus, by heating shelled food to between 75 and 82 degrees Celsius, it can be determined that the shelled food is fully cooked and does not need to be heated further, thereby saving energy consumption and reducing costs.

[0167] Please refer to Figure 16. The present invention also provides a computer-readable storage medium 300, on which a computer program 221 is stored. When the computer program 221 is executed by the processor 210, it implements the steps of the control method for heating shelled food in any of the above embodiments. For the sake of brevity, it will not be described in detail here.

[0168] In the description of this specification, the references to terms such as "some embodiments," "in one example," and "exemplarily" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0169] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0170] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A magnetron for use in microwave electrical appliances, characterized in that, The magnetron includes a filament with a wire diameter greater than or equal to 0.6 mm and less than or equal to 0.67 mm, and the filament is configured such that when the microwave appliance operates at an output power greater than or equal to 50 watts, the current of the filament is greater than or equal to 8 amps.

2. The magnetron according to claim 1, characterized in that, The filament has a length of 10.5 mm to 13.8 mm.

3. The magnetron according to claim 1 or 2, characterized in that, The outer diameter of the filament is 3.8 mm to 4.2 mm.

4. The magnetron according to any one of claims 1-3, characterized in that, The filament pitch is 1 mm to 1.32 mm.

5. The magnetron according to any one of claims 1-4, characterized in that, The magnetron includes an anode, a cathode, a first magnet, and a second magnet. The anode and the cathode are spaced apart and opposite each other. The cathode includes a filament. The anode and the cathode are located between the first magnet and the second magnet.

6. The magnetron according to claim 5, characterized in that, The anode is annular, and the cathode passes through a through hole formed by the anode.

7. The magnetron according to claim 5 or 6, characterized in that, The anode includes an anode cylinder and an anode blade. The anode blade and the cathode are located in the anode cylinder. The anode blade is connected to the inner side of the anode cylinder, and a heat sink is connected to the outer side of the anode cylinder.

8. The magnetron according to claim 7, characterized in that, The radiator includes a plurality of heat dissipation components arranged along the axial direction. Each heat dissipation component includes a cylindrical part and a heat dissipation part. The cylindrical part is sleeved and connected to the anode cylinder, and the heat dissipation part is connected to the side of the cylindrical part away from the anode cylinder. The heat dissipation part is bent.

9. The magnetron according to claim 8, characterized in that, The magnetron includes a duct component with an air duct inside. The anode, the cathode, the first magnet, the second magnet, and the heat sink are located in the air duct. One end of the heat sink is connected to the anode cylinder, and the other end of the heat sink is connected to the side wall of the duct component facing the air duct.

10. A microwave electrical appliance, characterized in that, It includes a frequency converter and a magnetron as described in any one of claims 1-9, wherein the frequency converter is electrically connected to the magnetron.

11. The microwave appliance according to claim 10, characterized in that, The frequency converter includes a transformer, which includes a primary winding, a secondary winding, and a filament winding. The filament winding is disposed between the primary winding and the secondary winding. The secondary winding and the filament winding are magnetically coupled to the primary winding. The magnetron includes an anode. The secondary winding is electrically connected to the anode, and the filament winding is electrically connected to the filament.

12. The microwave appliance according to claim 11, characterized in that, The frequency converter includes a first insulated-gate bipolar transistor (IGBT), a second IGBT, a controller, a filter circuit, and a rectifier bridge. The first IGBT and the second IGBT are connected to the primary winding. The controller is configured to control the on and off states of the first IGBT and the second IGBT to adjust the output power of the frequency converter. The filter circuit is used to maintain voltage stability in the frequency converter, and the rectifier bridge is used to convert the type of current input to the frequency converter.

13. A control method for heating shelled food, used in microwave cooking appliances, characterized in that, The microwave cooking appliance includes a cooking cavity and a microwave generator, and the control method includes: The microwave generator is controlled to operate at a first microwave power to perform a first heating stage on the shelled food, the first microwave power being determined based on the initial surface temperature of the shelled food and the oven cavity temperature of the cooking cavity; When the surface temperature of the shelled food reaches a first set temperature, the microwave generator is controlled to operate at a second microwave power to perform a second heating stage on the shelled food, wherein the second microwave power is less than the first microwave power.

14. The control method for heating shelled food according to claim 13, characterized in that, When the surface temperature of the shelled food reaches a first set temperature, controlling the microwave generator to operate at a second microwave power to perform a second heating stage on the shelled food includes: When the surface temperature of the shelled food reaches the first set temperature, the microwave generator is controlled to stop working for a preset time before resuming operation at the second microwave power.

15. The control method for heating shelled food according to claim 13 or 14, characterized in that, When the surface temperature of the shelled food reaches a first set temperature, controlling the microwave generator to operate at a second microwave power to perform a second heating stage on the shelled food includes: When the surface temperature of the shelled food reaches the first set temperature, the microwave generator is controlled to operate at a second microwave power to perform at least two second heating stages on the shelled food.

16. The control method for heating shelled food according to claim 15, characterized in that, When the surface temperature of the shelled food reaches the first set temperature, the microwave generator is controlled to operate at a second microwave power to perform at least two second heating stages on the shelled food, including: During the execution of the previous second heating stage, when the surface temperature of the shelled food reaches the second set temperature, the microwave generator is controlled to operate at the second microwave power to execute the next second heating stage on the shelled food. The second set temperature is greater than the first set temperature, and the second set temperature of the next second heating stage is greater than the second set temperature of the previous second heating stage.

17. The control method for heating shelled food according to claim 16, characterized in that, The second set temperature range is 65 degrees Celsius to 75 degrees Celsius.

18. The control method for heating shelled food according to claim 16 or 17, characterized in that, During the execution of the previous second heating stage, when the surface temperature of the shelled food reaches a second set temperature, controlling the microwave generator to operate at the second microwave power to execute the next second heating stage on the shelled food includes: During the execution of the previous second heating stage, when the surface temperature of the shelled food reaches the second set temperature, the microwave generator is controlled to stop working for a preset time before the next second heating stage is executed.

19. The control method for heating shelled food according to claim 14 or 18, characterized in that, The preset duration ranges from 3 seconds to 15 seconds.

20. The control method for heating shelled food according to any one of claims 13-19, characterized in that, The first microwave power ranges from 300 watts to 600 watts, the first set temperature ranges from 45 degrees Celsius to 60 degrees Celsius, and the second microwave power ranges from 50 watts to 200 watts.

21. The control method for heating shelled food according to any one of claims 13-20, characterized in that, After the step of controlling the microwave generator to operate at a second microwave power to perform a second heating stage on the shelled food, the control method includes: When the microwave generator heats the shelled food to a third set temperature at the second microwave power, the microwave generator is controlled to be turned off so that the shell of the shelled food remains intact.

22. The control method for heating shelled food according to claim 21, characterized in that, The third set temperature ranges from 75 degrees Celsius to 82 degrees Celsius.

23. A control device for a microwave cooking appliance, characterized in that, The control device includes: Processor, and; A memory storing a computer program, which, when executed by the processor, implements the steps of the control method for heating shelled food as described in any one of claims 13 to 22.

24. A microwave cooking appliance, characterized in that, It includes the control device, microwave generator, and cooking cavity as described in claim 23, wherein the control device is electrically connected to the microwave generator.

25. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the control method for heating shelled food as described in any one of claims 13-22.

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