CN114947498A - Radio frequency cooking appliance and control method - Google Patents
Radio frequency cooking appliance and control method Download PDFInfo
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- CN114947498A CN114947498A CN202110220821.6A CN202110220821A CN114947498A CN 114947498 A CN114947498 A CN 114947498A CN 202110220821 A CN202110220821 A CN 202110220821A CN 114947498 A CN114947498 A CN 114947498A
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- 238000010411 cooking Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000007787 solid Substances 0.000 claims abstract description 133
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 description 12
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- 230000000875 corresponding effect Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/24—Warming devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
The 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 said microwaves into said cavity via an antenna; a control section electrically connected to the solid state source; the temperature detection part is connected with the control part and used for detecting the temperature of the solid source, and the control part is used for controlling the solid source to reduce the power of the microwave or close the solid source under the condition that the temperature of the solid source is greater than the preset temperature. According to the radio frequency cooking appliance provided by the embodiment of the invention, the solid source is controlled to reduce the power of the microwave by detecting the temperature of the solid source and under the condition that the temperature of the solid source is greater than the preset temperature, so that the solid source can be protected under the condition of no load, and the reliability of the radio frequency cooking appliance is ensured.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a radio frequency cooking appliance and a control method.
Background
With the rapid development of society, the convenience of cooking food by people is improved. Currently, radio frequency cooking appliances are widely used for cooking food. When the radio frequency cooking appliance works, microwaves are emitted into the cavity to cook food. However, when the user forgets to put food into the cavity to turn on the cooking appliance during use, the cooking appliance may be in an unloaded state or a severely mismatched load state. At this time, for the solid-state source of the cooking appliance, an open circuit state or a mismatch load state is quite existed, and the solid-state source is easy to damage when being operated in the state for a long time, so that the reliability of the radio frequency cooking appliance is reduced.
Disclosure of Invention
The embodiment of the invention provides a radio frequency cooking appliance and a control method.
An rf cooking appliance according to an embodiment of the present invention includes:
a cavity;
a solid state source for emitting microwaves and feeding said microwaves into said cavity via an antenna;
a control section electrically connected to the solid state source;
the temperature detection part is connected with the control part and used for detecting the temperature of the solid-state source, and the control part is used for controlling the solid-state source to reduce the power of the microwaves or close the solid-state source under the condition that the temperature of the solid-state source is greater than the preset temperature.
According to the radio frequency cooking appliance provided by the embodiment of the invention, the solid source is controlled to reduce the power of the microwave or close the solid source by detecting the temperature of the solid source and controlling the solid source to reduce the power of the microwave or close the solid source under the condition that the temperature of the solid source is greater than the preset temperature, so that the solid source can be protected under the condition of no load, and the reliability of the radio frequency cooking appliance is ensured.
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, an output of the signal generator is connected to an input of the amplifier, an output of the amplifier is connected to the first port, the second port is connected to the antenna, the third port is connected to a load, the temperature detecting unit is configured to detect a temperature of the load, and the control unit is configured to control the solid-state source to reduce the power of the microwaves or turn off the solid-state source if the temperature of the load is greater than a preset temperature.
In some embodiments, the temperature detecting part is further configured to detect a temperature of at least one of the circulator and the amplifier, and the control part is configured to control the solid-state source to reduce the power of the microwave or turn off the solid-state source if the temperature of at least one of the load, the circulator and the amplifier is greater than a preset temperature.
In some embodiments, the solid-state source includes a signal generator, an amplifier, and an isolator, an output of the signal generator is connected to an input of the amplifier, an output of the amplifier is connected to an input of the isolator, an output of the isolator is connected to the antenna, the temperature detecting unit is configured to detect a temperature of the isolator, and the control unit is configured 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 isolator is greater than a preset temperature.
In some embodiments, the temperature detecting unit is further configured to detect a temperature of the amplifier, and the control unit is configured to control the solid-state source to reduce the power of the microwave or turn off the solid-state source when the temperature of at least one of the isolator and the amplifier is greater than a preset temperature.
In some embodiments, the solid-state source includes a power detection portion configured to detect power of reflected microwaves in the cavity, and the control portion is configured 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 and the power of the reflected microwaves is greater than a preset power.
In some embodiments, the solid-state source includes a signal generator and an amplifier, an output of the signal generator is connected to an input of the amplifier, an output of the amplifier is connected to the antenna, the temperature detecting unit is configured to detect a temperature of the amplifier, and the control unit is configured to control the solid-state source to reduce the power of the microwave or turn off the solid-state source if the temperature of the amplifier is greater than a preset temperature.
In some embodiments, the radio frequency cooking appliance includes a prompt part connected to the control part, and the control part is configured to control the prompt part to give 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.
The control method is used for a radio frequency cooking appliance, and the radio frequency cooking appliance comprises the following steps:
a cavity;
a solid state source for emitting microwaves and feeding said microwaves into said cavity via an antenna;
the control method comprises the following steps:
detecting a temperature of the solid state source;
and controlling the solid state source to reduce the power of the microwave or close the solid state source under the condition that the temperature of the solid state source is greater than the preset temperature.
According to the control method provided by the embodiment of the invention, the solid-state source is controlled to reduce the power of the microwave by detecting the temperature of the solid-state source and controlling the solid-state source to reduce the power of the microwave under the condition that the temperature of the solid-state source is greater than the preset temperature, so that the solid-state source can be protected under the condition of no load, and the reliability of the radio frequency cooking appliance is ensured.
In some embodiments, the control method further comprises:
detecting the power of the reflected microwaves within the cavity;
and under the condition that the temperature of the solid-state source is higher than the preset temperature and the power of the reflected microwaves is higher than the preset power, controlling the solid-state source to reduce the power of the microwaves or closing the solid-state source.
In some embodiments, the rf cooking appliance includes a reminder, and the control method includes:
and under the condition that the temperature of the solid source is higher than the preset temperature or the condition that the temperature of the solid source is higher than the preset temperature and the power of the reflected microwaves in the cavity is higher than the preset power, controlling the prompt part to send a prompt.
Additional aspects and advantages 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 the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a radio frequency cooking appliance according to an embodiment of the present invention.
Fig. 2 is a schematic block diagram of a radio frequency cooking appliance according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a solid-state source according to an embodiment of the present invention.
FIG. 4 is another schematic of a solid state source according to an embodiment of the present invention.
Fig. 5 is another schematic block diagram of a radio frequency cooking appliance according to an embodiment of the present invention.
FIG. 6 is a schematic diagram of yet another configuration of a solid state source in accordance with an embodiment of the present invention.
FIG. 7 is a schematic diagram of yet another configuration of a solid state source in accordance with an embodiment of the present invention.
Fig. 8 is a further block schematic diagram of a radio frequency cooking appliance in accordance with an embodiment of the present invention.
Fig. 9 is another schematic block diagram of a radio frequency cooking appliance according to an embodiment of the present invention.
Fig. 10 is a flowchart illustrating a control method according to an embodiment of the present invention.
Fig. 11 is another flow chart illustrating the control method according to the embodiment of the present invention.
Fig. 12 is still another flowchart illustrating the control method according to the embodiment of the present invention.
Fig. 13 is a further flowchart of the control method according to the embodiment of the present invention.
Fig. 14 is a further flowchart of the control method according to the embodiment of the present invention.
Fig. 15 is a further flowchart of the control method according to the embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of illustrating the embodiments of the present invention and are not to be construed as limiting the embodiments of the present invention.
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 construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; the two elements may be connected directly or indirectly through an intermediate medium, or the two elements may be connected through an intermediate medium or may be in an interactive relationship with each other. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, embodiments of the invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Referring to fig. 1 and fig. 2, an embodiment of the invention provides an rf cooking appliance 100, where the rf cooking appliance 100 includes: cavity 101, solid-state source 102, control portion 104 and temperature detection portion 108. The solid-state source 102 is used to emit microwaves and feed them into the cavity 101 via the antenna 106. The control section 104 is electrically connected to the solid state source 102. The temperature detection part 108 is connected to the control part 104, the temperature detection part 108 is used for detecting the temperature of the solid state source 102, and the control part 104 is used for controlling 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 higher than a preset temperature.
According to the radio frequency cooking appliance 100 of the embodiment of the invention, by detecting the temperature of the solid state source 102 and controlling the solid state source 102 to reduce the power of the microwave under the condition that the temperature of the solid state source 102 is greater than the preset temperature, the solid state source can be protected under the condition of no load, and the reliability of the radio frequency cooking appliance 100 is ensured.
In particular, rf cooking appliance 100 may refer to a semiconductor device cooking appliance containing solid state source 102, as opposed to a magnetron-based microwave cooking appliance. In the related art, a microwave cooking appliance based on a magnetron emits microwaves into a cavity using the magnetron, however, the microwave cooking appliance using the magnetron has no specific scheme for no-load protection because, on one hand, the magnetron can endure a relatively large mismatch state and, on the other hand, because of complexity of the magnetron, there is no suitable no-load protection scheme.
In the embodiment of the present invention, the rf cooking appliance 100 utilizes the solid state source 102 to emit the microwave, so that a suitable idle protection scheme can be designed for the solid state source 102. The radio frequency cooking appliance can be applied to household appliances such as a microwave oven, a micro steaming and baking all-in-one machine and the like.
The cavity 101 may be used for placing food to be cooked, and in the example shown in fig. 1, the cavity 101 is opened with a cavity 110, and the front side of the cavity 101 is opened with an opening 112 and connected with a lower door 114. The solid state source 102 may be disposed at a top portion of the cavity 101, which is beneficial to heat dissipation and maintenance of electrical components such as the solid state source 102.
The solid state source 102 acts as a radio frequency energy generating device to provide electromagnetic energy for heating or cooking food, and generates electromagnetic waves (microwaves). In the example of fig. 1, the rf cooking appliance 100 may also include electrical components such as a power source 116, a cable 118, a fan 120, and an electronic control board 122. The power source 116 may be an ACDC power source 116, provide power to the solid state source 102, or provide power to other electrical components of the rf cooking appliance 100. Fan 120 may be used as a cooling device to dissipate heat from solid state source 102 and power source 116, etc., to operate in a good temperature environment, to increase the reliability of rf cooking appliance 100, and may be an axial fan. The fan 120, the solid state source 102 and the power supply 116 are arranged above the cavity 101 from back to front, which is beneficial to heat dissipation of the solid state source 102 and the power supply 116.
Before the rf cooking appliance 100 leaves the factory, the preset temperature may be calibrated by simulating an idle 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 higher than the preset temperature, or is a mapping relationship, it may be determined that the rf cooking appliance 100 is in an idle state or a mismatched load state, and the solid state source 102 is controlled to reduce the power of the output microwave, so that the power of the reflected microwave in the cavity 101 is reduced, or the solid state source 102 is turned off, thereby protecting the solid state source 102.
The temperature detection unit 108 may include a temperature sensor 124 and a processing circuit, and the processing circuit may convert an analog signal output from the temperature sensor 124 into a digital signal and input the digital signal to the control unit 104. The temperature sensor 124 may be located inside the solid state source 102, beside the temperature sensitive components. In other embodiments, the control may be internal to the solid state source and may include a processor internal to the solid state source. I.e., the control section 104 may be placed inside the solid state source 102 and communicate with the electronic control board 122.
In some embodiments, referring to fig. 3, the 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, an output of the signal generator is connected to an input of the amplifier 126, an output of the amplifier 126 is connected to the first port 130, the second port 132 is connected to the antenna 106, the third port 134 is connected to a load 136, the temperature detecting unit 108 is configured to detect a temperature of the load 136, and the control unit 104 is configured to control the solid-state source 102 to reduce a 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 manner, by detecting the temperature of the load 136, it can be more accurately determined whether the rf cooking appliance 100 is in an unloaded state or a mismatched load state.
In particular, circulator 128 is a three-port device featuring unidirectional transmission of high frequency signal energy. The circulator 128 can control the transmission of electromagnetic waves (microwaves) along a certain circular direction. The 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 the characteristics are independent and mutually isolated. A load 136, which may be an rf load resistor, is connected to the third port 134 of the circulator 128. The amplifier 126 may employ a power amplifier transistor and serve as a final stage rf amplifier 126, which may amplify the small signal power to the power for heating food.
In the present embodiment, in the solid-state source 102, the pre-stage small signal output by the signal generator is input to the amplifier 126, the amplifier 126 amplifies the power of the small signal to the 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 (which port is determined as the output port by the 3 ports of the circulator 128 according to the layout of the actual circuit), and after passing through the cable 118 and the antenna 106, the energy is fed into the cavity 101 of the rf cooking apparatus 100 for heating or cooking food.
When a user is not placing food into the cavity 101 during cooking, electromagnetic wave energy output from the solid state source 102 enters the antenna 106 via reflections within the cavity 101, travels back into the solid state source 102 via the cable 118, the reflected microwaves are received by the solid state source 102, enter the second port 132 of the circulator 128, are output by the third port 134 of the circulator 128 into the load 136, and the load 136 converts the power of the reflected microwaves into heat loss and is dissipated through the heat sink. When the rf cooking appliance 100 is in an idle state or a mismatched load state, a large amount of reflected microwaves enter the solid state source 102, the temperature of the devices such as the circulator 128 and the load 136 in the solid state source 102 increases very rapidly, and it can be determined in advance that the load 136 is a device whose temperature increases significantly due to the reflected microwave power according to the idle state or the mismatched load state of the rf cooking appliance 100. Thus, the temperature sensor 124 may be located beside the load 136, and the specific location may be pre-calibrated. In this case, one temperature sensor 124 may be provided, but it is needless to say that a plurality of (two or more) temperature sensors 124 may be provided beside the load 136, and a final temperature value calculated by averaging a plurality of temperature data or assigning different weights may be used as a basis for the determination.
This embodiment is applicable to the rf cooking appliance 100 without the solid state source 102 having the reflected power detection portion. Of course, the radio frequency cooking appliance 100 of the present embodiment is not limited to this application scenario.
In some embodiments, the temperature detecting portion 108 is further configured to detect a temperature of at least one of the circulator 128 and the amplifier 126, and the control portion 104 is configured to control the solid state source 102 to reduce the power of the microwaves or turn off the solid state source 102 if the temperature of at least one of the load 136, the circulator 128, and the amplifier 126 is greater than a preset temperature. Therefore, detection points can be added, so that the temperature monitoring is more comprehensive.
Specifically, in one embodiment, the temperature sensing portion 108 may include three temperature sensors 124, one temperature sensor 124 disposed adjacent the load 136, one temperature sensor 124 disposed adjacent the circulator 128, and one temperature sensor 124 disposed adjacent the amplifier 126. The temperature value acquired by the temperature detection unit 108 may be transmitted to the control unit 104. In the case that any temperature value is greater than the preset temperature, it may be determined that rf cooking appliance 100 is in an unloaded or mismatched load state, and the output microwave power of solid state source 102 is controlled to decrease or turn off solid state source 102.
In one embodiment, the temperature sensing portion 108 may include two temperature sensors 124, one temperature sensor 124 disposed adjacent the load 136 and one temperature sensor 124 preferably disposed adjacent the circulator 128. Of course, in other embodiments, a temperature sensor 124 may be provided beside the amplifier 126. And is not particularly limited herein.
It is understood that the positions and number of the temperature sensors 124 are not limited to the positions discussed above, and may be disposed at other positions of the solid state source 102, and are not limited thereto. Temperature sensor 124 arrangement point selection sequence: 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, next to the circulator 128, next to the amplifier 126, and finally to select other high temperature points.
In addition, the same or different preset temperatures can be set to detect the no-load state or the mismatched load state corresponding to different electrical components, and the specific setting can be calibrated through experiments and simulation.
In some embodiments, referring to fig. 4, the solid-state source 102 includes a signal generator (not shown), an amplifier 126, and an isolator 138, an output of the signal generator is connected to an input of the amplifier 126, an output of the amplifier 126 is connected to an input of the isolator 138, an output of the isolator 138 is connected to the antenna 106, the temperature detecting unit 108 is configured to detect a temperature of the isolator 138, and the control unit 104 is configured to control the solid-state source 102 to reduce the power of the microwave if the temperature of the isolator 138 is greater than a preset temperature. In this manner, by detecting the temperature of the isolator 138, it can be more accurately determined whether the rf cooking appliance 100 is in an unloaded state or a mismatched load state.
In particular, the present embodiment may be applied to a radio frequency cooking appliance 100 having a solid state source 102 with an isolator 138. The isolator 138 may be implemented as a two-port device for isolating input and output signals. The temperature sensor 124 may be disposed beside the isolator 138 for detecting an unloaded condition or a mismatched load condition of the rf cooking appliance 100. When a large amount of reflected microwave power enters the isolator 138 inside the solid state source 102, the isolator 138 will rapidly increase in temperature due to the received electromagnetic wave energy, and when the temperature exceeds the predetermined temperature of the idle protection, the control portion 104 may control the solid state source 102 to decrease the output microwave power or turn off the solid state source 102.
In some embodiments, the temperature detecting part 108 is further configured to detect a temperature of the amplifier 126, and the control part 104 is configured to control the solid-state source 102 to reduce the power of the microwave if the temperature of at least one of the isolator 138 and the amplifier 126 is greater than a preset temperature. Therefore, detection points can be added, so that the temperature monitoring is more comprehensive.
Specifically, in one embodiment, the temperature sensing portion 108 may include two temperature sensors 124, one temperature sensor 124 disposed adjacent the isolator 138 and one temperature sensor 124 disposed adjacent the amplifier 126. The temperature value acquired by the temperature detection unit 108 may be transmitted to the control unit 104. In the case that any temperature value is greater than the preset temperature, it may be determined that rf cooking appliance 100 is in an unloaded or mismatched load state, and the output microwave power of solid state source 102 is controlled to decrease or turn off solid state source 102. It is understood that the positions and number of the temperature sensors 124 are not limited to the positions discussed above, and may be disposed at other positions of the solid state source 102, and are not limited thereto. Temperature sensor 124 arrangement point selection order: if there is only one temperature sensor 124, then the placement point is preferably selected next to the isolator 138, then to the amplifier 126 if there are more, and finally to the other temperature high points.
In some embodiments, referring to fig. 5 and fig. 6, the solid-state source 102 includes a power detection unit 140, the power detection unit 140 is configured to detect power of reflected microwaves inside the cavity 101, and the control unit 104 is configured 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 manner, safe and reliable operation of the solid state source 102 and the rf cooking appliance 100 may be substantially ensured.
Specifically, in the present embodiment, the false determination rate of the no-load detection is reduced to a large extent by the double detection determination of the temperature detection and the reflected power detection. The power detection part 140 may be used to detect the power of the reflected microwave within the cavity 101. In one embodiment, the power detection section 140 may be connected between the third port 134 of the circulator 128 and the load 136. When the reflected microwave passes through the circulator 128 into the load 136, the power detection unit 140 can know the power level of the reflected microwave, so as to determine the state of the rf cooking appliance 100.
In one embodiment, the power detection unit 140 may include a detection circuit, the detection circuit may include a detector, the detector may convert the reflected microwave signal into a voltage analog signal, and the rf detection circuit may convert the voltage analog signal into a digital signal and output the digital signal to the control unit 104. The power of the reflected microwave is positively correlated with the magnitude of the voltage signal, or is a mapping relation.
In some embodiments, referring to fig. 7, the solid-state source 102 includes a signal generator (not shown) and an amplifier 126, an output of the signal generator is connected to an input of the amplifier 126, an output of the amplifier 126 is connected to the antenna 106, the temperature detecting unit 108 is configured to detect a temperature of the amplifier 126, and the control unit 104 is configured 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 manner, by detecting the temperature of the amplifier 126, it can be more accurately determined whether the rf cooking appliance 100 is in an unloaded state or a mismatched load state.
In particular, this embodiment may be applied to the rf cooking appliance 100 when the solid state source 102 does not include a power protection device, such as the isolator 138, the circulator 128, the load 136, etc., and the output port of the amplifier 126 is used as the output port of the solid state source 102 and directly connected to the cable 118. The reflected microwaves in the cavity 101 go via the antenna 106 directly to the amplifier 126 in the solid state source 102, and the temperature of the device rises very rapidly. A temperature sensor 124 may be placed adjacent to the amplifier 126 and compared to a predetermined temperature to determine whether the rf cooking appliance 100 is in an unloaded or mismatched load condition.
It is understood that the positions and the number of the temperature sensors 124 are not limited to the positions discussed above, and may be disposed at other positions of the solid state source 102, and are not limited thereto. Temperature sensor 124 arrangement point selection sequence: if there is only one temperature sensor 124, then the placement point is preferably next to the amplifier 126, and if there are more, then the other temperature high points are selected.
In some embodiments, referring to fig. 8 and 9, the rf cooking appliance 100 includes a prompting portion 142 connected to the control portion 104, and the control portion 104 is configured to control the prompting portion 142 to issue a prompt when the temperature of the solid state source 102 is greater than a preset temperature, or when the temperature of the solid state source 102 is greater than the preset temperature and the power of the reflected microwave in the cavity 101 is greater than a preset power. In this manner, the user may be prompted to insert food and continue cooking.
Specifically, the prompting portion 142 may include, but is not limited to, a speaker, a display screen, a display lamp, and the like, and accordingly, the prompt may be an audio prompt, a visual prompt of characters, images, and the like displayed on the display screen, a visual prompt of a color, a flashing frequency, and the like displayed on the display lamp, and the like. The prompt displayed may be, for example, text such as "the rf cooking appliance is in an idle 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, "the radio frequency cooking appliance is in an idle state and please put food" or "the radio frequency cooking appliance is in a mismatch load state and please put food" or the like.
And is not particularly limited herein. In other embodiments, rf cooking appliance 100 may also send the alert to a terminal (e.g., a cell phone, a tablet, a wearable smart device, a vehicle-mounted terminal, etc.) in communication with rf cooking appliance 100, where the terminal performs the audible and/or visual alert.
After the user puts food in, the user can input an instruction that the food is put in the cavity 101 through the input part of the radio frequency cooking appliance 100, and the control part 104 receives the instruction and controls the solid state source 102 to continue working according to the original cooking program, so as to finish cooking the food.
In some embodiments, the input may include, but is not limited to, a touch screen display, keys, knobs, and the like. The input portion may be provided above the front plate of the cavity. For example, in the case where the input section includes a touch display screen, a key, and a knob, the key and the knob may be located on the same side of the touch display screen. The touch display screen can adopt a capacitive touch screen, and the display screen can adopt an OLED display screen or a liquid crystal display screen.
Referring to fig. 10, a control method according to an embodiment of the present invention is applied to an rf cooking appliance 100, where the rf cooking appliance 100 includes: a chamber 101 and a solid state source 102. A solid state source 102 for emitting microwaves and feeding the microwaves into the cavity 101 via an antenna 106.
The control method comprises the following steps:
step S01, detecting the temperature of the solid state source 102;
in step S02, the solid state source 102 is controlled to decrease the power of the microwave when the temperature of the solid state source 102 is higher than the preset temperature.
According to the control method provided by the embodiment of the invention, the temperature of the solid-state source 102 is detected, and the solid-state source 102 is controlled to reduce the power of the microwave under the condition that the temperature of the solid-state source 102 is greater than the preset temperature, so that the solid-state source can be protected under the condition of no load, and the reliability of the radio frequency cooking appliance 100 is ensured.
Specifically, referring to fig. 11, after the complete machine is cooked, the rf cooking appliance 100 starts to work according to the heating mode selected by the user, the rf cooking appliance 100 issues an instruction 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, and the temperature detecting unit 108 detects the temperature of the solid state source 102 in the current heating mode and determines whether the temperature is greater than a preset temperature. When the detected temperature is higher than the preset temperature value, the control part 104 controls the solid state source 102 to reduce the output microwave power. In one example, the output microwave power is reduced to 3dB, or to a standing wave operating condition where the amplifier 126, or circulator 128, or load 136, or isolator 138, etc., operate with acceptable reliability. And when the detected temperature value is less than or equal to the preset temperature, continuing heating or cooking until the temperature is finished. It will be appreciated that different heating modes, with different corresponding preset temperatures, may be provided. In other examples, the output microwave power may be reduced to other values, such as 0dB, 2dB, etc., and is not limited in this regard.
In other embodiments, the solid state source 102 may be turned off in the event that the temperature of the solid state source 102 is greater than a preset temperature.
It should be noted that the above explanation of the embodiments and the advantageous effects of the rf cooking appliance 100 are also applicable to the control methods used in the present embodiment and the following embodiments, and are not detailed herein to avoid redundancy.
In some embodiments, referring to fig. 12, the control method further includes:
detecting the power of the reflected microwaves within the cavity 101;
and controlling the solid-state source 102 to reduce the power of the microwave under the condition that 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.
In this manner, safe and reliable operation of the solid state source 102 and the rf cooking appliance 100 may be substantially ensured.
Specifically, referring to fig. 13, after the complete machine is cooked, the rf cooking appliance 100 starts to work according to the heating mode selected by the user, the rf cooking appliance 100 issues an instruction to the solid state source 102 through the electronic control board 122, the solid state source 102 outputs a microwave signal according to the instruction, and the temperature detecting 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 higher than the preheating temperature, the power detection part 140 is combined to detect whether the reflected microwave power is higher than the preset power. If the reflected microwave power is greater than the predetermined power, the control portion 104 may control the solid-state source 102 to decrease its output power. In one example, the output microwave power is reduced to 3dB, or to a standing wave operating condition where the amplifier 126 or circulator 128, or load 136, or isolator 138, etc., operate with acceptable reliability.
In case that the reflected microwave power value detected by the power detecting part 140 is less than or equal to the preset power, the heating mode is continued until the cooking is finished. When the temperature detected by the temperature detecting part 108 is less than or equal to the preset temperature, heating or cooking is continued until the completion.
It should be noted that, in the embodiment combining the reflected power detection and the temperature detection, only the identification of the empty load state or the mismatched load state is required, and the detection sequence of the reflected power detection and the temperature detection is not limited specifically. In other embodiments, the solid state source 102 may be turned off in the event that the temperature of the solid state source 102 is greater than a predetermined temperature and the power of the reflected microwaves is greater than a predetermined power.
In some embodiments, referring to fig. 14, the rf cooking appliance 100 includes a prompting portion 142, and the control method includes:
and step 03, controlling the prompting part 142 to give a prompt when the temperature of the solid-state source 102 is higher than the preset temperature.
In some embodiments, referring to fig. 15, the control method includes:
step 03, controlling the prompting part 142 to give a prompt when the temperature of the solid-state source 102 is higher than the preset temperature and the power of the reflected microwaves in the cavity 101 is higher than the preset power.
In this manner, the user may be prompted to insert food and continue cooking.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
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, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (11)
1. A radio frequency cooking appliance, comprising:
a cavity;
a solid state source for emitting microwaves and feeding said microwaves into said cavity via an antenna;
a control section electrically connected to the solid state source;
the temperature detection part is connected with the control part and used for detecting the temperature of the solid source, and the control part is used for controlling the solid source to reduce the power of the microwave or close the solid source under the condition that the temperature of the solid source is greater than the preset temperature.
2. The rf cooking appliance according to claim 1, wherein the solid state source comprises a signal generator, an amplifier and a circulator, the circulator comprises a first port, a second port and a third port, an output of the signal generator is connected to an input of the amplifier, an output of the amplifier is connected to the first port, the second port is connected to the antenna, the third port is connected to a load, the temperature detecting portion is configured to detect a temperature of the load, and the control portion is configured 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 load is greater than a preset temperature.
3. The rf cooking appliance according to claim 2, wherein the temperature detecting portion is further configured to detect a temperature of at least one of the circulator and the amplifier, and the control portion is configured to control the solid state source to reduce the power of the microwave or turn off the solid state source if the temperature of at least one of the load, the circulator and the amplifier is greater than a preset temperature.
4. The radio frequency cooking appliance according to claim 1, wherein the solid state source comprises a signal generator, an amplifier and an isolator, an output end of the signal generator is connected with an input end of the amplifier, an output end of the amplifier is connected with an input end of the isolator, an output end of the isolator is connected with the antenna, the temperature detecting portion is used for detecting the temperature of the isolator, and the control portion is used for controlling the solid state source to reduce the power of the microwave or turn off the solid state source when the temperature of the isolator is higher than a preset temperature.
5. The rf cooking appliance according to claim 4, wherein the temperature detecting portion is further configured to detect a temperature of the amplifier, and the control portion is configured to control the solid state source to reduce the power of the microwave or turn off the solid state source when the temperature of at least one of the isolator and the amplifier is greater than a preset temperature.
6. The rf cooking appliance according to claim 1, wherein the solid state source comprises a power detection portion for detecting the power of the reflected microwave within the cavity, and the control portion is configured 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 and the power of the reflected microwave is greater than a preset power.
7. The radio frequency cooking appliance according to claim 1, wherein the solid state source comprises a signal generator and an amplifier, an output end of the signal generator is connected with an input end of the amplifier, an output end of the amplifier is connected with the antenna, the temperature detecting portion is used for detecting the temperature of the amplifier, and the control portion is used for controlling the solid state source to reduce the power of the microwave or turn off the solid state source when the temperature of the amplifier is higher than a preset temperature.
8. The radio frequency cooking appliance according to any one of claims 1 to 7, wherein the radio frequency cooking appliance comprises a prompting part connected to the control part, and the control part is configured to control the prompting part to give a prompt when the temperature of the solid state source is higher than a preset temperature, or when the temperature of the solid state source is higher than a preset temperature and the power of the reflected microwaves in the cavity is higher than a preset power.
9. A control method for a radio frequency cooking appliance, characterized in that it comprises:
a cavity;
a solid state source for emitting microwaves and feeding said microwaves into said cavity via an antenna;
the control method comprises the following steps:
detecting a temperature of the solid state source;
and controlling the solid state source to reduce the power of the microwave or close the solid state source under the condition that the temperature of the solid state source is greater than the preset temperature.
10. The control method according to claim 9, characterized by further comprising:
detecting the power of the reflected microwaves within the cavity;
and under the condition that the temperature of the solid-state source is higher than the preset temperature and the power of the reflected microwaves is higher than the preset power, controlling the solid-state source to reduce the power of the microwaves or closing the solid-state source.
11. The control method of claim 9, wherein the radio frequency cooking appliance includes a prompting portion, the control method comprising:
and under the condition that the temperature of the solid source is higher than the preset temperature or the condition that the temperature of the solid source is higher than the preset temperature and the power of the reflected microwaves in the cavity is higher than the preset power, controlling the prompt part to send a prompt.
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