Radio frequency cooking device and control method

Abstract

The present invention discloses a radio frequency cooking appliance and a control method, wherein the radio frequency cooking appliance comprises: a cavity; a solid state source for emitting microwaves and feeding the microwaves into the cavity via an antenna; a control unit electrically connected to the solid state source; a temperature detection unit connected to the control unit, wherein the temperature detection unit is used to detect the temperature of the solid state source, and the control unit is used to control the solid state source to reduce the power of the microwaves or turn off the solid state source when the temperature of the solid state source is greater than a preset temperature. The radio frequency cooking appliance of the embodiment of the present invention detects the temperature of the solid state source, and controls the solid state source to reduce the power of the microwaves when the temperature of the solid state source is greater than a preset temperature, thereby protecting the solid state source in the case of no-load, thereby ensuring the reliability of the radio frequency cooking appliance.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a radio frequency cooking appliance and a control method thereof. Background Art

[0002] With the rapid development of society, people's cooking convenience for food has also improved. At present, radio frequency cooking utensils are widely used to cook food. When the radio frequency cooking utensils are working, microwaves will be emitted into the cavity to cook food. However, when the user forgets to put the food into the cavity and turns on the cooking utensils during use, the cooking utensils will be in an unloaded state or a serious mismatched load state. At this time, for the solid-state source of the cooking utensils, it is equivalent to an open circuit state or a mismatched load state. If the solid-state source works in this state for a long time, it will be easily damaged, which reduces the reliability of the radio frequency cooking utensils. Summary of the invention

[0003] The embodiments of the present invention provide a radio frequency cooking appliance and a control method thereof.

[0004] A radio frequency cooking device according to an embodiment of the present invention comprises:

[0005] Cavity;

[0006] A solid source, used for emitting microwaves and feeding the microwaves into the cavity via an antenna;

[0007] a control unit, electrically connected to the solid-state source;

[0008] A temperature detection unit is connected to the control unit, and is used to detect the temperature of the solid-state source. The control unit is used to control the solid-state source to reduce the power of the microwave or turn off the solid-state source when the temperature of the solid-state source is greater than a preset temperature.

[0009] The radio frequency cooking appliance of the embodiment of the present invention detects the temperature of the solid-state source and controls the solid-state source to reduce the power of the microwave or turn off the solid-state source when the temperature of the solid-state source is greater than a preset temperature. Therefore, the solid-state source can be protected in the case of no-load, thereby ensuring the reliability of the radio frequency cooking appliance.

[0010] In some embodiments, the solid-state source includes a signal generator, an amplifier and a circulator, the circulator includes a first port, a second port and a third port, the output end of the signal generator is connected to the input end of the amplifier, the output end of the amplifier is connected to the first port, the second port is connected to the antenna, and the third port is connected to the load. The temperature detection unit is used to detect the temperature of the load, and the control unit is used to control the solid-state source to reduce the power of the microwave or shut down the solid-state source when the temperature of the load is greater than a preset temperature.

[0011] In some embodiments, the temperature detection unit is also used to detect the temperature of at least one of the circulator and the amplifier, and the control unit is used to control the solid-state source to reduce the power of the microwave or shut down the solid-state source when the temperature of at least one of the load, the circulator and the amplifier is greater than a preset temperature.

[0012] In some embodiments, the solid-state source includes a signal generator, an amplifier and an isolator, the output end of the signal generator is connected to the input end of the amplifier, the output end of the amplifier is connected to the input end of the isolator, the output end of the isolator is connected to the antenna, the temperature detection unit is used to detect the temperature of the isolator, and the control unit is used to control the solid-state source to reduce the power of the microwave or shut down the solid-state source when the temperature of the isolator is greater than a preset temperature.

[0013] In some embodiments, the temperature detection unit is also used to detect the temperature of the amplifier, and the control unit is used to control the solid-state source to reduce the power of the microwave or shut down the solid-state source when the temperature of at least one of the isolator and the amplifier is greater than a preset temperature.

[0014] In some embodiments, the solid-state source includes a power detection unit, which is used to detect the power of reflected microwaves in the cavity, and the control unit is used to control the solid-state source to reduce the power of the microwaves or shut down the solid-state source when the temperature of the solid-state source is greater than a preset temperature and the power of the reflected microwaves is greater than a preset power.

[0015] In some embodiments, the solid-state source includes a signal generator and an amplifier, the output end of the signal generator is connected to the input end of the amplifier, the output end of the amplifier is connected to the antenna, the temperature detection unit is used to detect the temperature of the amplifier, and the control unit is used to control the solid-state source to reduce the power of the microwave or shut down the solid-state source when the temperature of the amplifier is greater than a preset temperature.

[0016] In some embodiments, the RF cooking appliance includes a prompt unit connected to the control unit, and the control unit is used to control the prompt unit to issue a prompt when the temperature of the solid-state source is greater than a preset temperature, or when the temperature of the solid-state source is greater than a preset temperature and the power of the reflected microwaves in the cavity is greater than a preset power.

[0017] A control method according to an embodiment of the present invention is used for a radio frequency cooking appliance, wherein the radio frequency cooking appliance comprises:

[0018] Cavity;

[0019] A solid source, used for emitting microwaves and feeding the microwaves into the cavity via an antenna;

[0020] The control method comprises:

[0021] detecting a temperature of the solid state source;

[0022] When the temperature of the solid-state source is greater than a preset temperature, the solid-state source is controlled to reduce the power of the microwave or the solid-state source is turned off.

[0023] The control method of the embodiment of the present invention detects the temperature of the solid-state source and controls the solid-state source to reduce the power of the microwave when the temperature of the solid-state source is greater than a preset temperature. Therefore, the solid-state source can be protected in the case of no-load, thereby ensuring the reliability of the radio frequency cooking appliance.

[0024] In some embodiments, the control method further comprises:

[0025] detecting the power of the reflected microwaves in the cavity;

[0026] When the temperature of the solid-state source is greater than a preset temperature and the power of the reflected microwave is greater than a preset power, the solid-state source is controlled to reduce the power of the microwave or the solid-state source is turned off.

[0027] In some embodiments, the radio frequency cooking appliance includes a prompting unit, and the control method includes:

[0028] When the temperature of the solid-state source is greater than a preset temperature, or when the temperature of the solid-state source is greater than a preset temperature and the power of the reflected microwaves in the cavity is greater than a preset power, the prompting unit is controlled to issue a prompt.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 It is a schematic structural diagram of a radio frequency cooking appliance according to an embodiment of the present invention.

[0032] Figure 2 It is a schematic diagram of a module of a radio frequency cooking appliance according to an embodiment of the present invention.

[0033] Figure 3 Schematic diagram of the structure of a solid-state source according to an embodiment of the present invention.

[0034] Figure 4is another schematic diagram of the structure of the solid-state source according to an embodiment of the present invention.

[0035] Figure 5 2 is another module schematic diagram of the radio frequency cooking appliance according to the embodiment of the present invention.

[0036] Figure 6 It is another structural schematic diagram of the solid-state source according to the embodiment of the present invention.

[0037] Figure 7 It is another schematic structural diagram of the solid-state source according to the embodiment of the present invention.

[0038] Figure 8 It is another module schematic diagram of the radio frequency cooking appliance according to the embodiment of the present invention.

[0039] Fig. 9 2 is another module schematic diagram of the radio frequency cooking appliance according to the embodiment of the present invention.

[0040] Fig.10 It is a flow chart of a control method according to an embodiment of the present invention.

[0041] Fig.11 2 is another flow chart of the control method according to the embodiment of the present invention.

[0042] Fig.12 It is another flow chart of the control method according to the embodiment of the present invention.

[0043] Fig.13 It is another flowchart of the control method according to the embodiment of the present invention.

[0044] Fig.14 It is another flowchart of the control method according to the embodiment of the present invention.

[0045] Fig.15 It is another flowchart of the control method according to the embodiment of the present invention. DETAILED DESCRIPTION

[0046] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present invention, and cannot be understood as limiting the embodiments of the present invention.

[0047] In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0049] The disclosure below provides many different embodiments or examples for realizing different structures of embodiments of the present invention. In order to simplify the disclosure of embodiments of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, embodiments of the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but those of ordinary skill in the art may appreciate the application of other processes and / or the use of other materials.

[0050] Please refer to Figure 1 and Figure 2 The embodiment of the present invention provides a radio frequency cooking device 100, which includes a cavity 101, a solid state source 102, a control unit 104, and a temperature detection unit 108. The solid state source 102 is used to emit microwaves and feed the microwaves into the cavity 101 through an antenna 106. The control unit 104 is electrically connected to the solid state source 102. The temperature detection unit 108 is connected to the control unit 104, and the temperature detection unit 108 is used to detect the temperature of the solid state source 102. The control unit 104 is used to control the solid state source 102 to reduce the power of the microwave or turn off the solid state source 102 when the temperature of the solid state source 102 is greater than a preset temperature.

[0051] The radio frequency cooking appliance 100 of the embodiment of the present invention detects the temperature of the solid state source 102 and controls the solid state source 102 to reduce the power of the microwave when the temperature of the solid state source 102 is greater than a preset temperature. Therefore, the solid state source can be protected in the no-load state, thereby ensuring the reliability of the radio frequency cooking appliance 100.

[0052] Specifically, the RF cooking appliance 100 may refer to a cooking appliance containing a semiconductor device of a solid-state source 102, which is different from a microwave cooking appliance based on a magnetron. In the related art, a microwave cooking appliance based on a magnetron uses a magnetron to transmit microwaves into a cavity, however, the microwave cooking appliance using a magnetron does not have a specific solution for no-load protection, on the one hand because the magnetron can withstand a relatively large mismatch state, and on the other hand because of the complexity of the magnetron, there is no suitable no-load protection solution.

[0053] In the embodiment of the present invention, the radio frequency cooking appliance 100 uses the solid source 102 to transmit microwaves, and a more suitable no-load protection scheme can be designed for the solid source 102. The radio frequency cooking appliance can be applied to household appliances such as microwave ovens, microwave ovens, and microwave ovens.

[0054] The cavity 101 can be used to place the food to be cooked. Figure 1 In the example shown, the cavity 101 is provided with a chamber 110, the front side of the cavity 101 is provided with an opening 112, and is connected with a lower door 114. The solid source 102 can be arranged at the top of the cavity 101, which is conducive to heat dissipation and maintenance of electrical components such as the solid source 102.

[0055] The solid state source 102 is a radio frequency energy generating device used to provide electromagnetic energy for heating or cooking food and can generate electromagnetic waves (microwaves). Figure 1 In the example of , the RF cooking appliance 100 may also include electrical components such as a power supply 116, a cable 118, a fan 120, and an electric control board 122. The power supply 116 may be an ACDC power supply 116, which provides power to the solid-state source 102, and may also provide power to other electrical components of the RF cooking appliance 100. The fan 120 may be used as a cooling device to dissipate heat for the solid-state source 102 and the power supply 116, so that they work in a good temperature environment and increase the reliability of the RF cooking appliance 100. The fan may be an axial flow fan. The fan 120, the solid-state source 102, and the power supply 116 are arranged from back to front above the cavity 101, which is beneficial to the heat dissipation of the solid-state source 102 and the power supply 116.

[0056] The cable 118 can be used as an energy transmission device, and the cable 118 transmits the output microwave of the solid-state source 102 to the antenna 106 or the feed port. It can be understood that the number of feed ports can be single, two or more than two. In the embodiment of a single feed port, the single feed port can be opened on the top plate of the cavity. In the embodiment of two or more feed ports, one feed port can be opened on the top plate of the cavity, one feed port can be opened on the left side plate of the cavity, one feed port can be opened on the right side plate of the cavity, etc., and accordingly, each feed port can be provided with an antenna. In addition, in order to further diverge the microwave, a stirring antenna can be provided at the feed port. The antenna 106 is used as an energy feeding device to feed the radio frequency energy of the solid-state source 102 into the cavity 101. The electric control board 122 can be used as a control device for the cooking appliance to control the operation of the entire system. The control unit 104 can be provided on the electric control board 122, or the electric control board 122 can be used as the control unit 104. The control unit 104 can include other functional components such as a controller. The electric control board 122 may be mounted on the outer surface of the rear plate of the cavity 101 .

[0057] Before the RF cooking appliance 100 leaves the factory, the preset temperature can be calibrated by simulating a no-load state or a mismatched load state through simulation, and stored in the RF cooking appliance 100. When the temperature of the solid-state source 102 is greater than the preset temperature, or a mapping relationship is formed, it can be determined that the RF cooking appliance 100 is in a no-load state or a mismatched load state, and the solid-state source 102 is controlled to reduce the power of the output microwave, thereby reducing the power of the reflected microwave in the cavity 101, or the solid-state source 102 is turned off to protect the solid-state source 102.

[0058] The temperature detection unit 108 may include a temperature sensor 124 and a related processing circuit. The processing circuit may convert the analog signal output by the temperature sensor 124 into a digital signal and input the digital signal to the control unit 104. The temperature sensor 124 may be disposed inside the solid-state source 102, next to a temperature-sensitive component. In other embodiments, the control unit may be inside the solid-state source and may include a processor inside the solid-state source. That is, the control unit 104 may be placed inside the solid-state source 102 and communicate with the electric control board 122.

[0059] In some embodiments, please combine Figure 3The solid-state source 102 includes a signal generator (not shown), an amplifier 126 and a circulator 128. The circulator 128 includes a first port 130, a second port 132 and a third port 134. The output of the signal generator is connected to the input of the amplifier 126. The output of the amplifier 126 is connected to the first port 130, the second port 132 is connected to the antenna 106, and the third port 134 is connected to the load 136. The temperature detection unit 108 is used to detect the temperature of the load 136. The control unit 104 is used to control the solid-state source 102 to reduce the power of the microwave or turn off the solid-state source when the temperature of the load 136 is greater than a preset temperature. In this way, by detecting the temperature of the load 136, it can be more accurately determined whether the radio frequency cooking appliance 100 is in a no-load state or a mismatched load state.

[0060] Specifically, the circulator 128 is a three-port device, which is characterized by unidirectional transmission of high-frequency signal energy. The circulator 128 can control the electromagnetic wave (microwave) to be transmitted along a certain circular direction. This characteristic of unidirectional transmission of high-frequency signal energy can be used between the output end of the high-frequency power amplifier 126 and the load 136, and play the role of being independent and "isolated" from each other. The load 136 can be a radio frequency load resistor, connected to the third port 134 of the circulator 128. The amplifier 126 can be a power amplifier transistor, and as the final stage radio frequency amplifier 126, it can amplify the small signal power to the power used to heat food.

[0061] In this embodiment, in the solid-state source 102, the front-stage small signal output by the signal generator is input to the amplifier 126, and the amplifier 126 amplifies the small signal power to a power level for heating food. The output end of the amplifier tube is connected to the first port 130 of the circulator 128, and the amplified input microwave power (forward power) is output from the second port 132 of the circulator 128 (the three ports of the circulator 128 can determine which port is used as the input port and the output port according to the actual circuit layout), and then after passing through the cable 118 and the antenna 106, the energy is fed into the cavity 101 of the RF cooking appliance 100 for heating or cooking food.

[0062] When the user does not put food into the cavity 101 during the cooking process, the electromagnetic wave energy output from the solid source 102 enters the antenna 106 through the reflection in the cavity 101, and then is transmitted back to the solid source 102 through the cable 118. The solid source 102 receives the reflected microwave and enters the second port 132 of the circulator 128, and is output to the load 136 by the third port 134 of the circulator 128. The load 136 converts the power of the reflected microwave into heat consumption and disperses it through the radiator. When the RF cooking appliance 100 is in an unloaded state or a mismatched load state, a large amount of reflected microwaves enter the solid source 102, and the temperature of the circulator 128, load 136 and other components in the solid source 102 rises rapidly. According to the unloaded state or mismatched load state of the RF cooking appliance 100, it can be determined in advance that the load 136 is a component whose temperature rise is more obvious due to the reflected microwave power. Therefore, the temperature sensor 124 can be set next to the load 136, and the specific position can be calibrated in advance. At this time, a temperature sensor 124 can be set. Of course, multiple (two or more) temperature sensors 124 can also be set next to the load 136, and the average of multiple temperature data or the final temperature value calculated by assigning different weights can be used as the basis for judgment.

[0063] This embodiment is applicable to the radio frequency cooking appliance 100 in which the solid state source 102 does not include a reflected power detection unit. Of course, the radio frequency cooking appliance 100 of this embodiment is not limited to this application scenario.

[0064] In some embodiments, the temperature detection unit 108 is further used to detect the temperature of at least one of the circulator 128 and the amplifier 126. The control unit 104 is used to control the solid-state source 102 to reduce the power of the microwave or turn off the solid-state source 102 when the temperature of at least one of the load 136, the circulator 128 and the amplifier 126 is greater than a preset temperature. In this way, more detection points can be added to make temperature monitoring more comprehensive.

[0065] Specifically, in one embodiment, the temperature detection unit 108 may include three temperature sensors 124, one temperature sensor 124 is arranged next to the load 136, one temperature sensor 124 is arranged next to the circulator 128, and one temperature sensor 124 is arranged next to the amplifier 126. The temperature value collected by the temperature detection unit 108 can be transmitted to the control unit 104. When any temperature value is greater than a preset temperature, it can be determined that the RF cooking appliance 100 is in a no-load or mismatched load state, and the output microwave power of the solid-state source 102 is controlled to be reduced or the solid-state source 102 is turned off.

[0066] In one embodiment, the temperature detection unit 108 may include two temperature sensors 124, one temperature sensor 124 is disposed next to the load 136, and one temperature sensor 124 is preferably disposed next to the circulator 128. Of course, in other embodiments, one temperature sensor 124 may also be disposed next to the amplifier 126. This is not specifically limited herein.

[0067] It is understood that the location and number of the temperature sensor 124 are not limited to the locations discussed above, and can be set at other locations of the solid-state source 102, which is not specifically limited here. The order of selecting the placement point of the temperature sensor 124: If there is only one temperature sensor 124, then the placement point is preferably selected next to the load 136. If there are multiple monitoring points, then the circulator 128 is selected again, then the amplifier 126 is selected, and finally other high temperature points are selected.

[0068] In addition, corresponding to different electrical components, the same or different preset temperatures can be set to detect no-load state or mismatched load state, and the specific settings can be calibrated through experiments and simulations.

[0069] In certain embodiments, see Figure 4 The solid-state source 102 includes a signal generator (not shown), an amplifier 126 and an isolator 138. The output of the signal generator is connected to the input of the amplifier 126, the output of the amplifier 126 is connected to the input of the isolator 138, the output of the isolator 138 is connected to the antenna 106, the temperature detection unit 108 is used to detect the temperature of the isolator 138, and the control unit 104 is used to control the solid-state source 102 to reduce the power of the microwave when the temperature of the isolator 138 is greater than a preset temperature. In this way, by detecting the temperature of the isolator 138, it can be more accurately determined whether the radio frequency cooking appliance 100 is in a no-load state or a mismatched load state.

[0070] Specifically, the present embodiment can be applied to a radio frequency cooking appliance 100 in which the solid state source 102 has an isolator 138. The isolator 138 can be used as a two-port device to isolate input and output signals. The temperature sensor 124 can be arranged next to the isolator 138 to detect the no-load state or mismatched load state of the radio frequency cooking appliance 100. When a large amount of reflected microwave power enters the isolator 138 in the solid state source 102, the temperature of the isolator 138 rises rapidly due to receiving electromagnetic wave energy. When the temperature exceeds the preset temperature of no-load protection, the control unit 104 can control the solid state source 102 to reduce the output microwave power, or shut down the solid state source 102.

[0071] In some embodiments, the temperature detection unit 108 is also used to detect the temperature of the amplifier 126, and the control unit 104 is used to control the solid-state source 102 to reduce the power of the microwave when the temperature of at least one of the isolator 138 and the amplifier 126 is greater than a preset temperature. In this way, more detection points can be added to make temperature monitoring more comprehensive.

[0072] Specifically, in one embodiment, the temperature detection unit 108 may include two temperature sensors 124, one temperature sensor 124 is arranged next to the isolator 138, and the other temperature sensor 124 is arranged next to the amplifier 126. The temperature value collected by the temperature detection unit 108 can be transmitted to the control unit 104. When any temperature value is greater than the preset temperature, it can be determined that the RF cooking appliance 100 is in a no-load or mismatched load state, and the output microwave power of the solid-state source 102 is controlled to be reduced or the solid-state source 102 is turned off. It can be understood that the position and number of the temperature sensor 124 are not limited to the position discussed above, and can be arranged at other positions of the solid-state source 102, which is not specifically limited here. The order of selecting the arrangement point of the temperature sensor 124: if there is only one temperature sensor 124, then the placement point is preferably selected next to the isolator 138, if there are multiple, then the amplifier 126 is selected, and finally other high temperature points are selected.

[0073] In certain embodiments, see Figure 5 and Figure 6 The solid-state source 102 includes a power detection unit 140, which is used to detect the power of the reflected microwaves in the cavity 101. The control unit 104 is used to control the solid-state source 102 to reduce the power of the microwaves when the temperature of the solid-state source 102 is greater than a preset temperature and the power of the reflected microwaves is greater than a preset power. In this way, the solid-state source 102 and the radio frequency cooking appliance 100 can be guaranteed to work safely and reliably to a large extent.

[0074] Specifically, in this embodiment, the false positive rate of no-load detection is reduced to a great extent through the dual detection and judgment of temperature detection and reflected power detection. The power detection unit 140 can be used to detect the power of the reflected microwave in the cavity 101. In one embodiment, the power detection unit 140 can be connected between the third port 134 of the circulator 128 and the load 136. When the reflected microwave passes through the circulator 128 to the load 136, the power of the reflected microwave can be known through the power detection unit 140, and the state of the radio frequency cooking appliance 100 can be judged.

[0075] In one embodiment, the power detection unit 140 may include a detection circuit, which may include a detector tube, which may convert the reflected microwave signal into a voltage analog signal, and the radio frequency detection circuit may convert the voltage analog signal into a digital signal and output it to the control unit 104. The power of the reflected microwave is positively correlated with the voltage signal, or is a mapping relationship.

[0076] In certain embodiments, see Figure 7 The solid-state source 102 includes a signal generator (not shown) and an amplifier 126. The output end of the signal generator is connected to the input end of the amplifier 126. The output end of the amplifier 126 is connected to the antenna 106. The temperature detection unit 108 is used to detect the temperature of the amplifier 126. The control unit 104 is used to control the solid-state source 102 to reduce the power of the microwave when the temperature of the amplifier 126 is greater than a preset temperature. In this way, by detecting the temperature of the amplifier 126, it can be more accurately determined whether the radio frequency cooking appliance 100 is in a no-load state or a mismatched load state.

[0077] Specifically, this embodiment is applicable to the RF cooking appliance 100 when the solid-state source 102 does not contain a power protection device, such as an isolator 138, a circulator 128, a load 136, etc. The output port of the amplifier 126 is used as the output port of the solid-state source 102, and is directly connected to the cable 118. The reflected microwave in the cavity 101 is directly transmitted to the amplifier 126 in the solid-state source 102 via the antenna 106, and the temperature of this device rises rapidly. A temperature sensor 124 can be placed next to the amplifier 126, and this temperature is compared with a preset temperature to determine whether the RF cooking appliance 100 is in a no-load state or a mismatched load state.

[0078] It is understood that the location and number of the temperature sensor 124 are not limited to the locations discussed above, and can be set at other locations of the solid-state source 102, which is not specifically limited here. The order of selecting the placement point of the temperature sensor 124: If there is only one temperature sensor 124, then the placement point is preferably selected next to the amplifier 126, and if there are multiple, then select other high temperature points.

[0079] In certain embodiments, see Figure 8 and Fig. 9 The radio frequency cooking appliance 100 includes a prompting unit 142 connected to the control unit 104. The control unit 104 is used to control the prompting unit 142 to issue a prompt when the temperature of the solid source 102 is greater than a preset temperature, or when the temperature of the solid source 102 is greater than a preset temperature and the power of the reflected microwaves in the cavity 101 is greater than a preset power. In this way, the user can be prompted to put in food and continue cooking.

[0080] Specifically, the prompt unit 142 may include but is not limited to a speaker, a display screen, a display light, etc. Accordingly, the prompt may be a sound prompt, a visual prompt such as text or an image displayed on the display screen, or a visual prompt such as the color or flashing frequency displayed by the display light. The displayed prompt may be, for example, text such as "The RF cooking appliance is in an empty state, please put in food" or "The RF cooking appliance is in a mismatched load state, please put in food". The broadcasted voice may be, for example, a voice such as "The RF cooking appliance is in an empty state, please put in food" or "The RF cooking appliance is in a mismatched load state, please put in food".

[0081] In other embodiments, the RF cooking appliance 100 may also send a prompt to a terminal (such as a mobile phone, a tablet computer, a wearable smart device, a vehicle-mounted terminal, etc.) that communicates with the RF cooking appliance 100, and the terminal performs an audible and / or optical prompt.

[0082] After the user puts the food in, the user can input an instruction that the food has been put into the cavity 101 through the input part of the RF cooking device 100. The control unit 104 receives the instruction and controls the solid state source 102 to continue working according to the original cooking program to complete the cooking of the food.

[0083] In some embodiments, the input part may include, but is not limited to, a touch display screen, a button, a knob, etc. The input part may be disposed above the front plate of the cavity. For example, in the case where the input part includes a touch display screen, a button, and a knob, the button and the knob may be located on the same side of the touch display screen. The touch display screen may be a capacitive touch screen, and the display screen may be an OLED display screen or a liquid crystal display screen.

[0084] Please refer to Fig.10 The control method provided in the embodiment of the present invention is used for a radio frequency cooking device 100, and the radio frequency cooking device 100 includes a cavity 101 and a solid source 102. The solid source 102 is used to emit microwaves and feed the microwaves into the cavity 101 through an antenna 106.

[0085] Control methods include:

[0086] Step S01, detecting the temperature of the solid state source 102;

[0087] Step S02 : when the temperature of the solid-state source 102 is greater than a preset temperature, control the solid-state source 102 to reduce the power of the microwaves.

[0088] The control method of the embodiment of the present invention detects the temperature of the solid-state source 102, and controls the solid-state source 102 to reduce the power of the microwave when the temperature of the solid-state source 102 is greater than the preset temperature. Therefore, the solid-state source can be protected in the no-load state, thereby ensuring the reliability of the radio frequency cooking appliance 100.

[0089] Specifically, please combine Fig.11 After the whole machine is cooked, the radio frequency cooking device 100 will start working according to the heating mode selected by the user. The radio frequency cooking device 100 sends instructions to the solid state source 102 through the electric control board 122. The solid state source 102 outputs a microwave signal according to the instruction. The temperature detection unit 108 detects the temperature of the solid state source 102 in the current heating mode and determines whether the temperature is greater than the preset temperature. When the detected temperature is greater than the preset temperature value, the control unit 104 controls the solid state source 102 to reduce its output microwave power. In one example, the output microwave power is reduced to 3dB, or to a standing wave working state where the amplifier 126, or the circulator 128, or the load 136, or the isolator 138 and other devices can work with acceptable reliability. When the detected temperature value is less than or equal to the preset temperature, heating or cooking continues until it is completed. It can be understood that different corresponding preset temperatures can be set for different heating modes. In other examples, the output microwave power can be reduced to other values, such as 0dB, or 2dB, etc., which are not specifically limited here.

[0090] In other embodiments, when the temperature of the solid-state source 102 is greater than a preset temperature, the solid-state source 102 may be turned off.

[0091] It should be pointed out that the above explanations of the implementation and beneficial effects of the radio frequency cooking appliance 100 are also applicable to the control methods of this implementation and the following implementations, and will not be elaborated here in detail to avoid redundancy.

[0092] In certain embodiments, see Fig.12 , the control method further includes:

[0093] Detecting the power of reflected microwaves in the cavity 101;

[0094] When the temperature of the solid-state source 102 is greater than a preset temperature and the power of the reflected microwaves is greater than a preset power, the solid-state source 102 is controlled to reduce the power of the microwaves.

[0095] In this way, the safe and reliable operation of the solid-state source 102 and the radio frequency cooking appliance 100 can be ensured to a large extent.

[0096] Specifically, please combine Fig.13After the whole machine is cooked, the RF cooking appliance 100 will start working according to the heating mode selected by the user. The RF cooking appliance 100 sends instructions to the solid-state source 102 through the electric control board 122. The solid-state source 102 outputs a microwave signal according to the instruction. The temperature detection unit 108 detects the temperature of the solid-state source 102 in the current heating mode and determines whether the temperature is greater than the preheating temperature. When the detected temperature is greater than the preheating temperature, the power detection unit 140 is combined to detect whether the reflected microwave power is greater than the preset power. If the reflected microwave power is greater than the preset power, the control unit 104 can control the solid-state source 102 to reduce its output power. In one example, the output microwave power is reduced to 3dB, or to a standing wave working state where the amplifier 126 or the circulator 128, or the load 136, or the isolator 138 and other devices can work with acceptable reliability.

[0097] When the reflected microwave power value detected by the power detection unit 140 is less than or equal to the preset power, the heating mode is continued until the cooking is finished. When the temperature collected by the temperature detection unit 108 is less than or equal to the preset temperature, the heating or cooking is continued until it is finished.

[0098] It should be noted that in the embodiment of combining the reflected power detection and the temperature detection, it is only necessary to achieve the recognition of the no-load state or the mismatched load state, and the detection sequence of the reflected power detection and the temperature detection is not limited to a specific limit. In other embodiments, when the temperature of the solid-state source 102 is greater than the preset temperature and the power of the reflected microwave is greater than the preset power, the solid-state source 102 can be turned off.

[0099] In certain embodiments, see Fig.14 The radio frequency cooking appliance 100 includes a prompting unit 142, and the control method includes:

[0100] Step 03: When the temperature of the solid state source 102 is greater than a preset temperature, the control prompt unit 142 issues a prompt.

[0101] In certain embodiments, see Fig.15 , control methods include:

[0102] Step 03, when the temperature of the solid source 102 is greater than the preset temperature and the power of the reflected microwaves in the cavity 101 is greater than the preset power, the control prompt unit 142 issues a prompt.

[0103] In this way, the user can be prompted to put in the food and continue cooking.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0105] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A radio frequency cooking appliance, characterized in that: include: Cavity; A solid source, used for emitting microwaves and feeding the microwaves into the cavity via an antenna; a control unit, electrically connected to the solid-state source; A temperature detection unit connected to the control unit, the temperature detection unit is used to detect the temperature of the solid state source; The solid-state source includes a power detection unit, which is used to detect the power of the reflected microwaves in the cavity. The control unit is used to control the solid-state source to reduce the power of the microwaves or shut down the solid-state source when the temperature of the solid-state source is greater than a preset temperature and the power of the reflected microwaves is greater than a preset power.

2. The radio frequency cooking device according to claim 1, characterized in that: The radio frequency cooking appliance comprises a prompting part connected to the control part, and the control part is used for controlling the prompting part to issue a prompt when the temperature of the solid source is greater than a preset temperature and the power of the reflected microwaves in the cavity is greater than a preset power.

3. A control method for a radio frequency cooking appliance, characterized in that: The radio frequency cooking appliance comprises: Cavity; A solid source, used for emitting microwaves and feeding the microwaves into the cavity via an antenna; The control method comprises: detecting a temperature of the solid state source; detecting the power of the reflected microwaves in the cavity; When the temperature of the solid-state source is greater than a preset temperature and the power of the reflected microwave is greater than a preset power, the solid-state source is controlled to reduce the power of the microwave or the solid-state source is turned off.

4. The control method according to claim 3, characterized in that: The radio frequency cooking appliance includes a prompting unit, and the control method includes: When the temperature of the solid-state source is greater than a preset temperature and the power of the reflected microwaves in the cavity is greater than a preset power, the prompting unit is controlled to issue a prompt.

Images