CN115379608A - Microwave heating device - Google Patents

Abstract

The application discloses a microwave heating device. The microwave heating device comprises a regulating component, an amplifying component and a protecting component. The adjusting component comprises an output end for outputting a transmitting signal. The amplifying assembly comprises an input end and an output end, the input end of the amplifying assembly is connected with the output end of the adjusting assembly, the amplifying assembly is used for carrying out power amplification on a transmitting signal output by the adjusting assembly, and the output end of the amplifying assembly is connected with the antenna. The protection component includes a circulator and a load, and the protection component is configured to conduct reflected energy of the transmission signal to the load using the circulator. The microwave heating device of the embodiment of the application adopts the amplifying assembly to amplify the power. The amplifying assembly is high in output power and efficiency, so that the microwave heating device can output a transmitting signal with high power, the working efficiency of the microwave heating device is improved, meanwhile, the circulator can conduct the reflecting energy of the transmitting signal to a load, and the reflecting energy of the transmitting signal is prevented from damaging the adjusting assembly and/or the amplifying assembly.

Description

Microwave heating device

Technical Field

The application relates to the field of household microwave equipment, in particular to a microwave heating device.

Background

In the related art, microwave energy heated by a magnetron cannot regulate and control frequency, phase and amplitude, and heating uniformity is poor. The microwave energy power for heating by adopting the solid source is small, the maximum single path can only reach 300W at present, the cost is high, the power is low, and the microwave energy reflected back under the condition of overlarge load standing wave is easy to damage the solid source.

Disclosure of Invention

The present application provides a microwave heating device.

The microwave heating device of the embodiment of the application comprises a regulating component, an amplifying component and a protecting component. The adjusting component comprises an output end and is used for outputting a transmitting signal; the amplifying assembly comprises an input end and an output end, the input end of the amplifying assembly is connected with the output end of the regulating assembly, the amplifying assembly is used for carrying out power amplification on the transmitting signal output by the regulating assembly, and the output end of the amplifying assembly is connected with the antenna; protection component the protection component includes a circulator and a load, the protection component configured to conduct reflected energy of the transmit signal to the load with the circulator.

In the microwave heating device of this application embodiment, adopted the amplifier module to carry out power amplification, because the output power of amplifier module is high, efficient, consequently, microwave heating device can export the transmitting signal of higher power, improves microwave heating device's work efficiency, and the circulator can conduct transmitting signal's reflection energy to load simultaneously, avoids transmitting signal's reflection energy to damage adjusting part and/or amplifier module.

In some embodiments, the amplification component comprises a forward wave quadrature amplifier.

In some embodiments, the amplification assembly includes a heat dissipation system for dissipating heat from the forward wave quadrature amplifier.

In some embodiments, the circulator comprises a first circulator, a first port of the first circulator is connected to the output end of the regulating component, a second port of the first circulator is connected to the input end of the amplifying component, and a third port of the first circulator is connected to the load.

In some embodiments, the circulator includes a second circulator, a first port of the second circulator is connected to the output of the amplifying assembly, a second port of the second circulator is connected to the antenna, and a third port of the second circulator is connected to the load.

In some embodiments, the protection assembly includes a pickup connecting the first port and the third port of the second circulator.

In some embodiments, the protection component includes a plurality of sub-protection components, a first port of the circulator of each sub-protection component is connected to the output end of the amplifying component, a second port of the circulator of each sub-protection component is connected to the antenna, and a third port of the circulator of each sub-protection component is connected to the load.

In certain embodiments, each sub-protection component comprises a pickup connecting the first port and the third port of the circulator.

In some embodiments, the microwave heating device further comprises a frequency converter power supply, and the frequency converter power supply is connected with the amplifying assembly and supplies power to the amplifying assembly.

In some embodiments, the adjusting component includes a radio frequency phase-locked loop for generating a transmit signal at a preset frequency, a phase shifter for adjusting a phase of the transmit signal, and an adjustable attenuator for adjusting an amplitude of the transmit signal.

Additional aspects and advantages of the present application 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 present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 to 4 are schematic views of a microwave heating apparatus according to an embodiment of the present application;

fig. 5 is a schematic block diagram of a microwave heating apparatus according to an embodiment of the present application.

The main characteristic reference numbers:

the microwave heating apparatus 100, the adjusting assembly 10, the adjusting assembly output 101, the frequency-locked loop 11, the phase shifter 12, the adjustable attenuator 13, the amplifying assembly 20, the amplifying assembly input 201, the amplifying assembly output 202, the cathode 203, the gate 204, the forward wave quadrature amplifier 21, the heat dissipation system 22, the protection assembly 30, the circulator 31, the first circulator 311, the first port 3111 of the first circulator 311, the second port 3112 of the first circulator 311, the third port 3113 of the first circulator 311, the second circulator 312, the first port 3121 of the second circulator 312, the second port 3122 of the second circulator 312, the third port 3123 of the second circulator 312, the load 32, the first port 301, the second port 302, the third port 303, the detector 33, the sub-protection assembly 34, the antenna 40, the cavity 50, the frequency converter power supply 60, the system power supply 62, and the processor 70.

Detailed Description

Reference will now be made in detail to embodiments of the present application, 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 by referring to the drawings are exemplary only for the purpose of explaining the embodiments of the present application, and are not to be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present application and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, a fixed connection, a detachable connection, or an integral connection unless otherwise explicitly stated or limited; 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 application can be understood by those of ordinary skill in the art according to specific situations.

In embodiments of the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the application. In order to simplify the disclosure of the embodiments of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Embodiments of the present application may repeat reference numerals and/or reference letters in the various examples 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 application 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, 2 and 3 together, a microwave heating apparatus 100 according to an embodiment of the present invention includes a regulating member 10, an amplifying member 20 and a protecting member 30. The adjusting assembly 10 comprises an output 101, the adjusting assembly 10 being configured to output a transmission signal. The amplifying assembly 20 comprises an input end 201 and an output end 202, the input end 201 of the amplifying assembly 20 is connected to the output end 101 of the adjusting assembly 10, the amplifying assembly 20 is used for performing power amplification on the transmission signal output by the adjusting assembly 10, and the output end 202 of the amplifying assembly 20 is connected to the antenna 40. The protection assembly 30 includes a circulator 31 and a load 32, and the protection assembly 30 is configured to conduct reflected energy of the transmission signal to the load 32 using the circulator 31.

In the microwave heating device 100 of the embodiment of the present application, the amplifying assembly 20 is used for power amplification, and since the output power of the amplifying assembly 20 is high and the efficiency is high, the microwave heating device 100 can output a transmitting signal with high power, so as to improve the working efficiency of the microwave heating device 100, and meanwhile, the circulator 31 can conduct the reflection energy of the transmitting signal to the load 32, thereby avoiding the reflection energy of the transmitting signal from damaging the adjusting assembly 10 and/or the amplifying assembly 20.

The microwave heating device 100 may include, but is not limited to, a microwave oven, a microwave rice cooker, and the like.

In certain embodiments, the conditioning assembly 10 includes a solid-state source, also known as a microwave solid-state oscillator (microwave solid-state oscillator), which employs a solid-state active device, which is a device capable of generating an electromagnetic wave signal. The solid-state source has the characteristics of stable frequency and accurate power. The solid-state source comprises a small signal plate, the solid-state source is a semiconductor power source, the semiconductor power source has the advantages that the frequency, the amplitude and the phase can be adjusted and controlled, and the adjustment and the control of the three dimensions are mainly realized by a small signal link of the semiconductor solid-state source, namely, the small signal plate can be adjusted in the three dimensions to generate a transmitting signal with adjustable frequency, phase and amplitude. It is worth mentioning that the number of the solid state sources includes a single, two or more than two, the microwave heating device further includes an antenna 40 and a cavity 50, and the electromagnetic waves generated by the solid state sources are fed into the cavity 50 through the antenna 40. The antenna 40 is a converter, and the antenna 40 can convert the transmission signal amplified by the amplifying unit 20 into an electromagnetic wave propagating in space. In some embodiments, a horn antenna or a parabolic antenna may be used, and the material of the antenna 40 may be silver, copper, aluminum or other conductive material. The cavity 50 is used for placing food to be heated, the material of the cavity 50 includes a metal material, and the antenna 40 may be disposed at the top of the cavity 50 to feed electromagnetic waves into the cavity 50, or may feed electromagnetic waves into the cavity 50 through a plurality of antennas 40 to increase the uniformity of heating food.

In some embodiments, the microwave heating apparatus 100 can feed electromagnetic wave signals with specific power, frequency and phase into the cavity 50 through the 2 antennas 40 simultaneously, so as to form electromagnetic wave signals with a certain phase difference in the cavity 50. In some embodiments, antenna 40 comprises a slot antenna, which is an antenna formed by slots formed in a conductor plane, and which excites a radio frequency electromagnetic field and radiates electromagnetic waves into space. The slot antenna has a series of outstanding advantages of easy processing, economic manufacturing cost, high radiation efficiency, stable performance and the like. Antenna 40 also includes a dipole antenna that may be used to transmit and receive signals at a fixed frequency. The dipole antenna consists of two conductors and has the characteristics of simple use method, easy realization, good effect and the like. In other embodiments, the number of antennas 40 may be 3, 4, or more than 4.

In some embodiments, the adjustment assembly 10 may generate a transmit signal of at least one of a predetermined frequency, amplitude, and phase. Taking the frequency as an example, the preset frequency may be a transmission signal of a corresponding frequency obtained by calculating a microwave signal according to a user requirement, or may be a transmission signal set by the microwave heating apparatus 100 before leaving a factory, which is not limited herein. In some embodiments, the microwave heating apparatus 100 includes an input component, which may include at least one of a key, a knob switch, a microphone, and a touch display, and when the microwave heating apparatus 100 is turned on, a user may set different frequencies and powers through the input component to control the adjusting component 10 to output a transmission signal of a preset frequency.

In some embodiments, the microwave heating apparatus 100 may include a communication component, the communication component may perform wired or wireless communication with a terminal by using bluetooth, infrared, WIFI, a mobile communication network, a data line, and the like, when the microwave heating apparatus 100 is turned on, frequency and power may be set by the terminal, the communication component receives an instruction sent by the terminal, the microwave heating apparatus 100 controls the adjusting component 10 to output a transmission signal of a preset frequency according to the instruction, and the terminal includes, but is not limited to, a mobile phone, a tablet computer, a wearable smart device, a personal computer, a server, and other household appliances.

Referring to fig. 2, fig. 3 and fig. 4, the output terminal 101 of the adjusting element 10 is capable of outputting a transmitting signal with a predetermined frequency, the input terminal 201 of the amplifying element 20 is connected to the output terminal 101 of the adjusting element 10, and the output terminal 202 of the amplifying element 20 is connected to the antenna 40. It should be noted that the output 202 of the amplifying assembly 20 may be directly connected to the antenna 40 (as shown in fig. 2) or indirectly connected to the antenna 40 (as shown in fig. 3), which is not limited herein. The amplifying assembly 20 may be indirectly connected to the antenna 40 through the protection assembly 30, and the protection assembly 30 may prevent the reflected energy of the transmitted signal from damaging the adjusting assembly 10 and/or the amplifying assembly 20.

The amplifying assembly 20 can amplify the power of the transmitting signal output by the adjusting assembly 10, so that the microwave heating device 100 can output a transmitting signal with higher power, and the working efficiency of the microwave heating device 100 is improved. The protection assembly 30 includes a circulator 31 and a load 32.

Circulator 31 is a multi-port device in which the transmission of microwaves is only allowed to circulate in a single direction, while the opposite direction is isolated. It can also be understood that: the adjusting assembly 10 is used for outputting a transmitting signal with a preset frequency, and after the power of the transmitting signal is amplified by the amplifying assembly 20, the transmitting signal is transmitted along the direction of the antenna 40 through the circulator 31, and finally fed into the cavity 50 to heat the food. The opposite direction of the circulator 31 is isolated, that is, the reflected energy of the transmitted signal in the cavity 50 is not transmitted to the amplifying assembly 20 and the regulating assembly 10 through the circulator 31, but is conducted to the load 32 and converted into heat, so that the reflected energy of the transmitted signal can be prevented from damaging the regulating assembly 10 and/or the amplifying assembly 20. The circulator 31 includes a microstrip three-terminal circulator, which uses ferrite material as a medium, and is provided with a conduction band structure and a constant magnetic field, thereby having a circulating characteristic. If the direction of the bias magnetic field is changed, the circulating direction of the microwave is changed.

It should be noted that the power capacity of the circulator 31 cannot be smaller than the maximum output power amplified by the amplifying element 20, that is, if the power capacity of the circulator 31 is larger than the maximum output power amplified by the amplifying element 20, the extreme case of total reflection at the output end can be borne. The power capacity of circulator 31 should therefore be closely matched to the design of the maximum output power of amplifying assembly 20.

Referring again to fig. 1, in some embodiments, microwave heating apparatus 100 may include 2 protective assemblies 30,2 protective assemblies 30 each including a circulator 31. One of the protection components 30 includes a first circulator 311, and the other protection component 30 includes a second circulator 312. In this manner, the first circulator 311 can prevent reflected energy of the transmitted signal from damaging the conditioning assembly 10, and the second circulator 312 can prevent reflected energy of the transmitted signal from damaging the conditioning assembly 10 and/or the amplifying assembly 20. In this way, the protection of the conditioning pack 10 can be improved.

In some embodiments, the amplification assembly 20 includes a forward wave quadrature amplifier 21.

Specifically, the forward-wave quadrature Amplifier 21 (CFA) is also called a forward-wave quadrature Amplifier tube, a quadrature Field Amplifier. The forward wave quadrature amplifier 21 is a microwave tube, and the forward wave quadrature amplifier 21 is a microwave tube for amplifying a signal by moving electrons in a quadrature electromagnetic field and exchanging energy with the microwave field. The direction of the phase velocity of the wave in the forward wave quadrature amplifier 21 (i.e., the direction of electron movement) coincides with the group velocity direction (the direction of energy transmission). The forward wave quadrature amplifier 21 can be divided into an injection type and a distributed transmission type. The electron beam of the injection type forward wave orthogonal amplifier 21 is not reentrant, and the distributed emission type amplifying tube is divided into two types of electron beam reentrant and electron beam non-reentrant. The forward wave quadrature amplifier 21 can work in a continuous wave or pulse state, so that the efficiency of the forward wave quadrature amplifier 21 is high, and meanwhile, the forward wave quadrature amplifier 21 also has the advantages of high phase sensitivity, flat gain, compact structure, small volume, light weight, simple additional power supply and the like.

The forward wave quadrature amplifier 21 has a radio frequency pass-through characteristic compared to other solid-state source amplifiers 21. That is, the transmission signal of the preset frequency output by the adjusting component 10 is input to the forward wave quadrature amplifier 21, and is amplified and output by the forward wave quadrature amplifier 21, so that the transmission signal can pass through without loss. The frequency, phase and amplitude changes of the transmit signal of the predetermined frequency output by the adjustment assembly 10 cause the forward wave quadrature amplifier 21 to amplify and output the frequency, phase and amplitude changes of the transmit signal, which are related. Thus, the forward wave quadrature amplifier 21 has high output power and high efficiency, and can output a transmission signal without loss. Therefore, the microwave heating device 100 can output a higher power transmission signal, improve the working efficiency of the microwave heating device 100,

in some embodiments, amplification assembly 20 includes a heat dissipation system 22 for dissipating heat from forward wave quadrature amplifier 21.

In one embodiment, the heat dissipation system 22 includes a heat dissipation housing, a base plate, mounting screws, and a heat sink. The forward wave quadrature amplifier 21 may be mounted on the base plate, and the heat dissipation housing may cover the base plate, and the heat dissipation housing and the base plate may be fixedly connected through mounting screw holes. The heat dissipation shell further comprises heat dissipation holes. The forward wave quadrature amplifier 21 and the radiator all set up between heat dissipation shell and bottom plate, the forward wave quadrature amplifier 21 can set up with the radiator back of the body on the bottom plate, the radiator can be the heat abstractor that induced drafts, that is to say, the radiator can pass through the louvre with the heat that the forward wave quadrature amplifier 21 produced and discharge, so cooling system 22 can dispel the heat to forward wave quadrature amplifier 21, the life of extension forward wave quadrature amplifier 21, the shell that dispels the heat simultaneously can protect forward wave quadrature amplifier 21 and avoid colliding with.

In another embodiment, the heat dissipation system 22 includes a base plate, a heat dissipation platform. The forward wave quadrature amplifier 21 can be installed on the bottom plate, a through hole is formed in the installation position of the forward wave quadrature amplifier 21, a heat dissipation platform is fixed below the through hole, the heat dissipation platform can comprise a heat dissipation fin or a heat dissipation fan, and therefore the heat dissipation system 22 can dissipate heat of the forward wave quadrature amplifier 21 through the heat dissipation platform, the through hole and the like.

It should be noted that the amplifying assembly 20 includes a heat dissipation system 22, the heat dissipation system 22 may be designed and installed according to a plurality of factors such as a design position of the forward wave quadrature amplifier 21, a shape and a size of the forward wave quadrature amplifier 21, and a performance strength, specific devices of the heat dissipation system 22 are not limited, and the heat dissipation system 22 can dissipate heat of the forward wave quadrature amplifier 21, so as to prevent the forward wave quadrature amplifier 21 from being damaged due to overheating.

In some embodiments, the microwave heating apparatus 100 further comprises a frequency converter power supply 60, and the frequency converter power supply 60 is connected to the amplifying assembly 20 for supplying power to the amplifying assembly 20.

Specifically, the inverter power supply 60 is also referred to as an Ac power Frequency Converter (AFC). In some embodiments, the frequency converter power supply 60 can convert ac power into ac power, dc power, ac power, and filter power, and finally output a pure sine wave, and the frequency and voltage output by the frequency converter power supply 60 can be adjusted within a certain range. The power supply 60 of the frequency converter has the advantages of small loss, high working efficiency, simple structure, accurate control and safe use. The forward wave quadrature amplifier 21 comprises a cathode 203 and a gate 204, and the frequency converter power supply 60 may apply a voltage between the cathode 203 and the gate 204, such that the frequency converter power supply 60 is connected to the forward wave quadrature amplifier 21 to supply power to the forward wave quadrature amplifier 21. In some embodiments, the inverter power supply 60 may also be connected to the amplifying assembly 20 to supply power to the amplifying assembly 20.

It is worth mentioning that the adjusting assembly 10 can be powered by the system power supply 62, so that the adjusting assembly 10 and the amplifying assembly 20 can be powered separately, thereby ensuring the power supply efficiency and protecting the power supply safety of the adjusting assembly 10 and the amplifying assembly 20.

Referring to fig. 2, in some embodiments, the circulator 31 includes a first circulator 311, a first port 3111 of the first circulator 311 is connected to the output terminal 101 of the adjusting component 10, a second port 3112 of the first circulator 311 is connected to the input terminal 201 of the amplifying component 20, and a third port 3113 of the first circulator 311 is connected to the load 32.

Specifically, the first circulator 311 is disposed between the adjusting component 10 and the amplifying component 20, the first circulator 311 may be a high-power first circulator 311, and the reflected energy of the transmitting signal is guided into the load 32 through the third port 3113 and converted into heat, so that the reflected energy of the transmitting signal is prevented from being back-filled into the adjusting component 10, and the reflected energy of the transmitting signal is prevented from damaging the adjusting component 10.

Referring to fig. 3, in some embodiments, the circulator 31 includes a second circulator 312, a first port 3121 of the second circulator 312 is connected to the output 202 of the amplifying assembly 20, a second port 3122 of the second circulator 312 is connected to the antenna 40, and a third port 3123 of the second circulator 312 is connected to the load 32.

Specifically, the second circulator 312 is disposed between the amplifying assembly 20 and the antenna 40, and the second circulator 312 may be a high-power second circulator 312, and the reflected energy of the transmitting signal is guided to the load 32 through the third port 3123 and converted into heat, so that the reflected energy of the transmitting signal is prevented from being back-injected into the amplifying assembly 20 and the adjusting assembly 10, and the reflected energy of the transmitting signal is prevented from damaging the adjusting assembly 10 and/or the amplifying assembly 20.

Referring again to fig. 2, in some embodiments, the protection assembly 30 includes a detector 33, and the detector 33 is connected to the first port 3111 and the third port 3113 of the first circulator 311.

Referring again to fig. 3, in some embodiments, the protection assembly 30 includes a pickup element 33, and the pickup element 33 is connected to the first port 3121 and the third port 3123 of the second circulator 312.

Specifically, the detector element 33 includes a detector diode, which is a device capable of detecting useful information in the wobble signal. A detector diode is a device that can identify the presence or change of a wave, oscillation, or signal. The detector is typically used to extract the information carried.

Referring to fig. 2-5, in some embodiments, microwave heating apparatus 100 includes processor 70, and protection component 30 includes a forward coupler and a reverse coupler (not shown), wherein the forward coupler performs forward power detection and the reverse coupler performs reverse power detection, that is, the forward coupler is used for detecting an output energy value of a transmission signal and the reverse coupler is used for detecting a reflection energy value of the transmission signal. The wave detecting part 33 may generate a first detection signal from an output energy value of the transmission signal, generate a second detection signal from a reflection energy value of the transmission signal, and feed back the first detection signal and the second detection signal to the processor 70, that is, the wave detecting part 33 feeds back the output energy value and the reflection energy value to the processor 70. In some embodiments, the processor 70 is capable of processing the plurality of detection signals, determining whether the output energy value is higher or lower than a predetermined value, and adjusting the adjustment assembly 10 according to the determination result, thereby adjusting the signal energy.

It is noted that the forward coupler may be disposed at the first port 301 of the circulator 31 and the reverse coupler may be disposed at the third port 303 of the circulator 31.

The processor 10 of the microwave heating device 100 may be a single chip integrated with a processor, a memory, a communication module, and the like. The processor may refer to a processor included in the controller. The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc.

Referring again to fig. 4, in some embodiments, the protection device 30 includes a plurality of sub-protection devices 34, a first port 301 of the circulator 31 of each sub-protection device 34 is connected to the output terminal 202 of the amplifying device 20, a second port 302 of the circulator 31 of each sub-protection device 34 is connected to the antenna 40, and a third port 303 of the circulator 31 of each sub-protection device 34 is connected to the load 32.

In one embodiment, the protection assembly 30 includes two sub-protection assemblies 34, each sub-protection assembly 34 including a circulator 31, the circulators 31 conducting reflected energy of the transmitted signal to the load 32. Two sub-protection modules 34 are connected in series with the amplifying module 20, and the two sub-protection modules 34 are correspondingly connected in parallel.

The second port 302 of the circulator 31 of each sub-protection component 34 is connected to the antenna 40. In one embodiment, the microwave heating apparatus 100 includes one antenna 40, the protection component 30 includes two sub-protection components 34, and the second ports 302 of the two circulators 31 of the two sub-protection components 34 are connected to one antenna 40, that is, the microwave heating apparatus 100 can feed energy into the cavity 50 by using one antenna 40. In another embodiment, the microwave heating apparatus 100 includes two antennas 40, the protection component 30 includes two sub-protection components 34, and the second ports 302 of the two circulators 31 of the two sub-protection components 34 are connected to the antennas 40 in a one-to-one correspondence manner, that is, the microwave heating apparatus 100 can feed energy into the cavity 50 by using the two antennas 40. In some embodiments, the number of sub-protection components 34 may be 2, 3, 4, or more than 4, and the number of antennas 40 may also be 3, 4, or more than 4. The multiple antennas 40 feed energy into the cavity 50 at different positions to improve the uniform heating effect of the food.

It is worth mentioning that the output power of the microwave heating device 100 can reach kilowatt level or even megawatt level after being amplified by the amplifying assembly 20, so that the power capacity of the circulator 31 should be perfectly matched to the design of the amplifying assembly 20 with the maximum output power. In the case where the protection component 30 includes a plurality of sub-protection components 34, the power capacity of the plurality of circulators 31 should also be matched to the design between the maximum output powers of the amplifying components 20. That is, the power capacity of the circulator 31 of each sub-protection component 34 may be Pout/N, pout being expressed as the maximum output power of the amplifying component 20, and N being expressed as the number of circulators 31. Therefore, the circulator 31 with middle power can be used for control protection, the production cost of the microwave heating device 100 is reduced, and the selectivity of the circulator 31 is increased.

In one embodiment, the protection component 30 includes 2 sub-protection components 34, and 2 sub-protection components 34 include 2 circulators 31 and 2 loads 32. The maximum output power of the amplifying assembly 20 is 1000W, and the power capacity of each circulator 31 is 500W at the minimum.

In another embodiment, the protection assembly 30 includes 3 sub-protection assemblies 34, and 3 sub-protection assemblies 34 include 3 circulators 31 and 3 loads 32. The maximum output power of the amplifying assembly 20 is 1200W, and the power capacity of each circulator 31 is 400W at the minimum.

In yet another embodiment, the protection assembly 30 includes 4 sub-protection assemblies 34, and 4 sub-protection assemblies 34 include 4 circulators 31 and 4 loads 32. The maximum output power of the amplifying assembly 20 is 1200W, and the power capacity of each circulator 31 is 300W at the minimum.

In some embodiments, each sub-protection assembly 34 includes a pickup element 33, and pickup element 33 connects first port 301 and third port 303 of circulator 31.

In some embodiments, each sub-protection component 34 further includes a forward coupler and a reverse coupler, and the forward coupler and the reverse coupler of each sub-protection component 34 are capable of detecting forward power and reverse power. The detector element 33 of each sub-protection component 34 is capable of generating a corresponding detection signal that is fed back to the processor 70. Detector element 33 may comprise a detector tube.

In one embodiment, the protection component 30 includes 2 sub-protection components 34, and 2 sub-protection components 34 include 2 circulators 31, 2 loads 32, and 2 detectors 33.2 wave detecting elements 33 respectively generate 2 forward detection signals from the output energy values of the 2 transmission signals detected by the forward coupler; the 2 detectors 33 respectively generate 2 reverse detection signals from the reflection energy values of the 2 transmission signals detected by the reverse coupler. The 2 detector elements 33 can feed back 4 detection signals to the processor 70.

In another embodiment, the protection component 30 includes 3 sub-protection components 34, and 3 sub-protection components 34 include 3 circulators 31, 3 loads 32, and 3 detectors 33. The 3 detectors 33 respectively generate 3 forward detection signals from the output energy values of the 3 transmission signals detected by the forward coupler; the 3 detectors 33 respectively generate 3 reverse detection signals from the reflection energy values of the 3 transmission signals detected by the reverse coupler. The 3 detectors 33 can feed back 6 detection signals to the processor 70.

In some embodiments, the adjusting assembly 10 includes a radio frequency phase locked loop 11, a phase shifter 12 and an adjustable attenuator 13, the radio frequency phase locked loop 11 being configured to generate a transmit signal at a predetermined frequency, the phase shifter 12 being configured to adjust a phase of the transmit signal, and the adjustable attenuator 13 being configured to adjust an amplitude of the transmit signal.

Specifically, the rf pll 11 is a feedback control circuit, and the rf pll 11 can control the frequency of the loop internal oscillation signal according to the signal input by the processor 70. The phase shifter 12 is a device capable of adjusting the phase of a signal. The adjustable attenuator 13 is an electronic component that provides attenuation. After the rf pll 11 generates a transmission signal with a predetermined frequency, the phase shifter 12 adjusts the phase of the transmission signal, and the adjustable attenuator 13 adjusts the amplitude of the transmission signal.

In some embodiments, the adjusting assembly 10 further includes a detector 14, and the detector 14 may be configured to detect whether the adjusting assembly 10 outputs a transmission signal with a preset frequency, determine a real-time transmission signal output by the adjusting assembly 10, and adjust the radio frequency phase-locked loop 11, the phase shifter 12, and the adjustable attenuator 13 if the transmission signal with the preset frequency is not output, so as to achieve output of the transmission signal with the preset frequency.

In some embodiments, the order of connection of the phase shifter 12 and the adjustable attenuator 13 may be switched. In one embodiment, the rf pll 11 generates a transmission signal with a predetermined frequency, and then performs amplitude adjustment through the adjustable attenuator 13 and phase adjustment through the phase shifter 12. Therefore, the frequency of the signal can be controlled through the radio frequency phase-locked loop 11, the phase shifter 12 can be phase-controlled, the adjustable attenuator 13 can be amplitude-controlled, the amplifying component 20 has low cost and high transmitting power, the high efficiency, high power and accurate controllability of the transmitted signal are realized, and the output power of the microwave heating device 100 can reach kilowatt level or even megawatt level.

In some embodiments, the microwave heating apparatus 100 further includes a control panel and a door, the control panel is disposed on the microwave heating apparatus 100, and a user can set a desired electromagnetic wave power through the control panel. In one embodiment, the electromagnetic wave power required by the user may be 1000W, and the user may use the touch screen on the control panel to set the final output power to be 1000W. In another embodiment, the electromagnetic wave power required by the user may be 1200W, and the user may use a mechanical knob on the control panel to set the final output power to be 1000W.

In certain embodiments, microwave heating apparatus 100 comprises a door. The door body is connected to the cavity 50. The cavity 50 has a cooking cavity therein, and the front side of the cooking cavity has an opening. The door body is rotatably coupled to a front portion of the cavity 50, and the door body is coupled to the cavity 50 to open and close the opening. That is, the cavity 50 has an opening whose front side is opened, and the door is used to open and close a cooking chamber for placing food to be cooked, and the door is in a closed state during cooking of the food. In some embodiments, the door body can be provided with a door body handle, so that the door body handle can be operated conveniently and is convenient for opening and closing the door body.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like means 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 application. 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 application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.

Claims (10)

1. A microwave heating apparatus, characterized in that the microwave heating apparatus comprises:

a conditioning component comprising an output, the conditioning component for outputting a transmit signal;

the amplifying assembly comprises an input end and an output end, the input end of the amplifying assembly is connected with the output end of the regulating assembly, the amplifying assembly is used for carrying out power amplification on the transmitting signal output by the regulating assembly, and the output end of the amplifying assembly is connected with the antenna;

a protection component comprising a circulator and a load, the protection component configured to conduct reflected energy of the transmit signal to the load with the circulator.

2. A microwave heating device in accordance with claim 1 wherein the amplifying assembly comprises a forward wave quadrature amplifier.

3. A microwave heating device in accordance with claim 2 wherein the amplification assembly comprises a heat dissipation system for dissipating heat from the forward wave quadrature amplifier.

4. A microwave heating device in accordance with claim 1 wherein the circulator comprises a first circulator, a first port of the first circulator being connected to the output of the regulation assembly, a second port of the first circulator being connected to the input of the amplification assembly, and a third port of the first circulator being connected to the load.

5. A microwave heating device in accordance with any of claims 1 to 3 wherein the circulator comprises a second circulator, a first port of the second circulator being connected to the output of the amplifying assembly, a second port of the second circulator being connected to the antenna, and a third port of the second circulator being connected to the load.

6. A microwave heating apparatus as in claim 5 wherein the protection assembly comprises a pickup connecting the first port and the third port of the second circulator.

7. A microwave heating apparatus as in claim 1 wherein the guard assembly comprises a plurality of sub-guard assemblies, a first port of the circulator of each sub-guard assembly being connected to the output of the amplifying assembly, a second port of the circulator of each sub-guard assembly being connected to the antenna, and a third port of the circulator of each sub-guard assembly being connected to the load.

8. A microwave heating apparatus as in claim 7 wherein each sub-protection assembly comprises a pickup connecting the first port and the third port of the circulator.

9. A microwave heating apparatus as in claim 1 further comprising a frequency converter power supply, wherein the frequency converter power supply is connected to the amplifying assembly for supplying power to the amplifying assembly.

10. A microwave heating apparatus as in claim 1 wherein the adjustment assembly comprises a radio frequency phase locked loop for generating a transmit signal at a predetermined frequency, a phase shifter for adjusting the phase of the transmit signal, and an adjustable attenuator for adjusting the amplitude of the transmit signal.

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