CN111194109B - Microwave heating assembly and microwave heating equipment - Google Patents
Microwave heating assembly and microwave heating equipment Download PDFInfo
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- CN111194109B CN111194109B CN201911397291.1A CN201911397291A CN111194109B CN 111194109 B CN111194109 B CN 111194109B CN 201911397291 A CN201911397291 A CN 201911397291A CN 111194109 B CN111194109 B CN 111194109B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/68—Circuits for monitoring or control
- H05B6/686—Circuits comprising a signal generator and power amplifier, e.g. using solid state oscillators
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/68—Circuits for monitoring or control
- H05B6/687—Circuits for monitoring or control for cooking
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- Control Of High-Frequency Heating Circuits (AREA)
Abstract
The invention provides a microwave heating assembly and microwave heating equipment, wherein the microwave heating assembly comprises a heating unit, a radiation unit and a control unit, the heating unit comprises a microwave source, the microwave source comprises a power amplifier, the radiation unit is used for enabling a microwave signal output by the power amplifier to radiate, the control unit is connected with the power amplifier, and the control unit is used for outputting a control signal to the power amplifier and adjusting the control signal to adjust the output power of the microwave signal. Above-mentioned microwave heating element adjusts microwave signal's output through adjustment control signal to can need not to increase extra component (such as the numerical control attenuator), just can realize output's nimble change, reach control microwave signal's output's purpose, and can promote control power's precision through the accurate control to control signal, also reduced microwave heating element's cost simultaneously.
Description
Technical Field
The invention relates to the field of microwave equipment, in particular to a microwave heating assembly and microwave heating equipment.
Background
Currently, microwave heating devices may employ semiconductor microwave sources to generate microwaves for cooking food. In the related art, the output power adjustment of the semiconductor microwave source is realized by a numerical control attenuator, and particularly, the numerical control attenuator is configured with an attenuation value of the attenuator through a digital parallel interface or an SPI serial port, so that the function of adjusting the output power according to requirements is realized. However, the way of adjusting the output power in this way makes the precision of controlling the power of the microwave heating device lower, which cannot meet the application requirement of the microwave heating device, and also causes the cost of the microwave heating device to increase.
Disclosure of Invention
The embodiment of the invention provides a microwave heating assembly and microwave heating equipment.
The microwave heating assembly comprises a heating unit, a radiation unit and a control unit, wherein the heating unit comprises a microwave source, the microwave source comprises a power amplifier, the radiation unit is used for radiating a microwave signal output by the power amplifier, the control unit is connected with the power amplifier, and the control unit is used for outputting a control signal to the power amplifier and adjusting the control signal to adjust the output power of the microwave signal.
Above-mentioned microwave heating element adjusts microwave signal's output through adjustment control signal, can need not to increase extra component like this (like the numerical control attenuator), just can realize output's nimble change, reaches control microwave signal's output's purpose to can promote control power's precision through the accurate control to control signal, also reduced microwave heating element's cost simultaneously.
In some embodiments, the adjustment step of the output power of the microwave signal is determined by the accuracy of the control signal. Therefore, the output power of the microwave signal can be accurately adjusted according to the precision of the control signal.
In some embodiments, the microwave heating assembly is provided with a plurality of voltage ranges, each voltage range corresponds to an operating state of the power amplifier, the operating state of the power amplifier is related to the output power of the microwave signal, and the control unit is configured to control the voltage of the control signal to be in a different voltage range to adjust the output power of the microwave signal. Therefore, the efficiency of determining the output power of the microwave signal is high, and the output power of the microwave signal can be determined quickly by controlling the voltage of the control signal to be in different voltage ranges.
In some embodiments, the plurality of voltage ranges includes a first voltage range, a second voltage range, and a third voltage range, the voltage of the first voltage range being less than the voltage of the second voltage range, the voltage of the second voltage range being less than the voltage of the third voltage range,
the power amplifier is in a cut-off state when the voltage of the control signal is in the first voltage range;
the power amplifier is in an amplifying state when the voltage of the control signal is in the second voltage range;
the power amplifier is in a saturation state when the voltage of the control signal is in the third voltage range. Therefore, the control unit can quickly determine the output power of the microwave signal according to the specific voltage range of the control signal, and reliably and quickly control the output power of the microwave signal.
In some embodiments, the microwave heating assembly includes an acquisition unit, the acquisition unit includes a directional coupler and a detector, the directional coupler connects the power amplifier and the radiation unit, the detector connects the directional coupler, and the control unit is configured to receive the output power of the microwave signal and the reflected power of the microwave signal through the detector. Therefore, the output power of the microwave signal fed into the cavity and the reflected power of the microwave signal reflected in the cavity through the radiation unit can be collected through the collection unit.
In some embodiments, the directional coupler includes a forward coupler and a backward coupler, the detecting element includes a first detecting element and a second detecting element, the forward coupler is connected to the first detecting element, the backward coupler is connected to the second detecting element, the first detecting element is configured to output the output power of the microwave signal, and the second detecting element is configured to output the reflected power of the microwave signal. Therefore, the microwave signal can be coupled and collected through the directional coupler, and the output power and the reflected power of the microwave signal are output through the detection component.
In some embodiments, the power amplifier acts as a final amplifier of the microwave heating assembly. Therefore, the number of devices of the microwave heating assembly can be reduced, and the cost of the microwave heating assembly and the microwave heating equipment is further reduced.
In some embodiments, the control unit comprises a digital-to-analog converter for outputting the control signal. Therefore, the power amplifier can be controlled by the digital signal through the digital-to-analog converter, and the output power of the microwave signal can be controlled more accurately.
In some embodiments, the power amplifier comprises a laterally diffused metal oxide semiconductor or gallium nitride transistor. In this way, the type of power amplifier can be flexibly selected.
The microwave heating device comprises a cavity and the microwave heating assembly of any embodiment, wherein the radiation unit is used for feeding a microwave signal output by the power amplifier into the cavity.
Above-mentioned microwave heating equipment adjusts microwave signal's output through adjustment control signal, can need not to increase extra component like this (like the numerical control attenuator), just can realize output's nimble change, reaches control microwave signal's output's purpose to can promote control power's precision through the accurate control to control signal, also reduced microwave heating assembly's cost simultaneously.
Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.
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 block diagram of a microwave heating apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the relationship between the control signal and the output power of the microwave heating device according to the embodiment of the present invention;
FIG. 3 is another schematic block diagram of a microwave heating apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic view of yet another module of a microwave heating apparatus in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of yet another module of a microwave heating apparatus in accordance with an embodiment of the present invention;
fig. 6 is a schematic view of still another module of a microwave heating apparatus according to an embodiment of the present invention.
Description of the main element symbols: a microwave heating device 100;
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 illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description 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, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are intended to be construed broadly, as meaning fixed or removable or integral connections. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present 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, the present invention may repeat reference numerals and/or reference letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize other processes and or other materials for use.
Referring to fig. 1, the present invention provides a microwave heating assembly 10 and a microwave heating apparatus 100. A microwave heating assembly 10 of the embodiment of the present invention comprises a heating unit 12, a radiation unit 14 and a control unit 16, wherein the heating unit 12 comprises a microwave source 122, the microwave source 122 comprises a power amplifier 1222, the radiation unit 14 is used for radiating a microwave signal output by the power amplifier 1222, the control unit 16 is connected with the power amplifier 1222, and the control unit 16 is used for outputting a control signal to the power amplifier 1222 and adjusting the control signal to adjust the output power of the microwave signal.
The embodiment of the present invention further provides a microwave heating apparatus 100, which comprises a cavity 18 and a microwave heating assembly 10, wherein the radiation unit 14 is used for feeding the microwave signal output by the power amplifier 1222 into the cavity 18.
Above-mentioned microwave heating element 10 and microwave heating equipment 100 adjust microwave signal's output through adjustment control signal to can need not to increase extra component (such as numerical control attenuator), just can realize output's nimble change, reach control microwave signal's output's purpose, and can promote control power's precision through the accurate control to control signal, also reduced microwave heating element 10 and microwave heating equipment 100's cost simultaneously.
In the related technology, the microwave heating assembly mostly adopts a numerical control attenuator to realize the adjustment of the output power, the numerical control attenuator is connected between a microwave source signal and a power amplifier, the adjustment of the output power of the microwave signal is stepped to 0.5dB through the numerical control attenuator, and the dynamic range of the power adjustment is 20dB, so that the output power of the microwave signal can be adjusted, thereby not only increasing the complexity of the microwave heating equipment, but also having higher requirements on the attenuation value of the attenuator configured by the numerical control attenuator, greatly influencing the overall production cost of the microwave heating equipment, and being incapable of meeting the application requirements of the microwave heating equipment. In order to achieve the desired heating effect and flexibly adjust the output power of the microwave signal, and to reduce the cost of the microwave heating device, it is necessary to improve the microwave heating device.
Specifically, referring to fig. 1, in the present embodiment, the microwave heating assembly 10 emits a microwave signal to heat food in the cavity 18, the cavity 18 can be used to contain food to be heated, when in operation, the microwave source 122 in the heating unit 12 emits a low-power microwave signal, the microwave signal is amplified by the power amplifier 1222 of the microwave source 122 and output to the radiating unit 14, and the radiating unit 14 feeds the microwave signal into the cavity 18, so as to heat the food in the cavity 18. The control unit 16 can be used to control the voltage level of the control signal and thus adjust the output power of the microwave signal of the power amplifier 1222, so that a more specific and precise adjustment of the output power can be achieved without the need of additionally adding a digitally controlled attenuator (e.g., saving RMB30 cost by omitting a digitally controlled attenuator).
The microwave source 122 may comprise a semiconductor microwave source. The semiconductor microwave source comprises a semiconductor microwave signal generator and a heat sink, etc., wherein the semiconductor microwave signal generator can generate a microwave signal, the input end of the power amplifier 1222 is connected with the semiconductor microwave signal generator, and the microwave signal is input through the input end of the power amplifier 1222 and is output through the output end of the power amplifier 1222 after being amplified. The heat sink may dissipate heat from the microwave source 122. The control signal may be understood as a gate voltage control signal of the power amplifier 1222.
In some embodiments, power amplifier 1222 includes a laterally-diffused metal-oxide semiconductor (LDMOS) or gallium nitride or (GaN) transistor. As such, the type of power amplifier 1222 may be flexibly selected.
Specifically, the LDMOS transistor has a characteristic of large power and high efficiency, which means that the output power can be amplified with high power, the high efficiency means that the gain, linearity, switching performance, and heat dissipation performance are better, compared with a common transistor, the LDMOS transistor can operate under higher reflected power without damaging the LDMOS transistor, the LDMOS transistor has a low and unchanged intermodulation level to a saturation region, that is, the LDMOS transistor is in a cut-off state, a linear amplification state, and a saturation state. The LDMOS transistor can amplify output power with high efficiency and high power, and meets the requirements of users.
The gallium nitride transistor is a semiconductor composed of a compound of nitrogen and gallium, and has good heat resistance, high electron mobility, high electron saturation drift rate, and high operating frequency, so that the gallium nitride transistor can stably and efficiently amplify output power. The two transistors can be selected according to specific requirements.
In some embodiments, the adjustment step of the output power of the microwave signal is determined by the accuracy of the control signal. Therefore, the output power of the microwave signal can be accurately adjusted according to the precision of the control signal.
Specifically, the adjustment step of the output power of the microwave signal may be understood as adjusting the magnitude of the output power each time, and as a specific example, in the case that the output power is 250W, the adjustment step of the output power is 10W, and the output power of the microwave signal will be increased or decreased by 10W, for example, 260W, 270W, 260W, 250W, 240W, 230W, 220W, etc. each time the adjustment step is adjusted. The higher the precision of the control signal is, the smaller the corresponding adjustment step of the output power is, that is, the more precise the power adjustment is. The accuracy of the control signal may be understood as each time the magnitude of the control signal is adjusted. The correspondence between the accuracy of the control signal and the adjustment step of the output power may be preset and stored. The output power of the power amplifier 1222 is adjusted by the control signal, so that the power adjustment step can be improved from the original 112W to the minimum precision of 1W, and the power change step can be adjusted according to the requirement, thereby realizing the adjustment of the output power with high precision.
In some embodiments, the microwave heating assembly 10 is provided with a plurality of voltage ranges, each voltage range corresponds to an operating state of the power amplifier 1222, the operating state of the power amplifier 1222 is related to the output power of the microwave signal, and the control unit 16 is configured to control the voltage of the control signal to be in a different voltage range to adjust the output power of the microwave signal. Therefore, the efficiency of determining the output power of the microwave signal is high, and the output power of the microwave signal can be determined quickly by controlling the voltage of the control signal to be in different voltage ranges.
Specifically, the voltage of the control signal may correspond to different operating states of the power amplifier 1222 in different voltage ranges, the different operating states of the power amplifier 1222 are related to the output power, and the control unit 16 may adjust the voltage of the control signal to be in different voltage ranges according to a user input or a default setting, adjust the voltage to be the output power of the appropriate microwave signal, and then precisely control the output power of the microwave signal, thereby reducing the hardware cost. More specifically, the control unit 16 may receive an output power set by a user or a default setting, and control the voltage of the control signal according to the corresponding relationship between the output power and the control signal, so that the output power of the microwave signal matches the required output power.
The number of voltage ranges may be determined based on factors such as the adjustment accuracy or requirements of the microwave heating assembly 10. In some embodiments below, the plurality of voltage ranges may include three voltage ranges. The embodiments of the present invention are not particularly limited.
In some embodiments, the plurality of voltage ranges includes a first voltage range, a second voltage range, and a third voltage range, the voltage of the first voltage range being less than the voltage of the second voltage range, the voltage of the second voltage range being less than the voltage of the third voltage range,
in the case where the voltage of the control signal is in the first voltage range, the power amplifier 1222 is in an off state;
in the case where the voltage of the control signal is in the second voltage range, the power amplifier 1222 is in an amplified state;
in the case where the voltage of the control signal is in the third voltage range, the power amplifier 1222 is in a saturation state. In this way, the control unit 16 can quickly determine the output power of the microwave signal according to the specific voltage range in which the control signal is located, and reliably and quickly control the output power of the microwave signal.
Specifically, the voltage of the first voltage range is smaller than that of the second voltage range, and the voltage of the second voltage range is smaller than that of the third voltage range, that is, the first voltage range, the second voltage range, and the third voltage range may be set in segments by consecutive intervals of voltages, or may be set in segments by some voltage or voltages in the middle interval. The voltage range may be preset in the control unit 16 or other components of the microwave heating assembly 10.
In one example, the first voltage range can be considered as a voltage range corresponding to the power amplifier 1222 being in the off state, and when the voltage of the control signal is in the first voltage range, the power amplifier 1222 is in the off state and the output power is zero. The second voltage range can be considered as a voltage range corresponding to the linear amplification state of the power amplifier 1222, and is a common operating region of the power amplifier 1222. When the voltage of the control signal is in the second voltage range, the voltage of the control signal and the output power of the microwave signal are in a linear amplification relation, the voltage of the control signal is increased, the output power is increased, and similarly, the voltage of the control signal is decreased, and the output power is decreased. The third voltage range may be considered as a voltage range corresponding to the power amplifier 1222 being in a saturation state, and in a case where the voltage of the control signal is in the third voltage range, the power amplifier 1222 is in a saturation state. Thus, the power amplifier 1222 is operated in a state related to the output power of the power amplifier 1222, and the control unit 16 can control the voltage of the control signal in different voltage ranges, control the operation state of the power amplifier 1222, and adjust the output power of the microwave signal.
It will be appreciated that in the case where the voltage of the control signal is in the third voltage range, the power amplifier 1222 is in saturation, where the output power of the microwave signal is the maximum output power.
In addition, referring to fig. 2, in one embodiment, the first voltage range, the second voltage range, and the third voltage range are divided by U0, U1, and U3, wherein 0< U0< U3, the first voltage range is [0, U0 ], the second voltage range is [ U0, U3], and the third voltage range (U3, + ∞).
When U < U0 is 0 ≦ U (i.e., the voltage of the control signal is in the first voltage range), the power amplifier 1222 is in the off state, and the output power Pout of the microwave signal is 0W.
In the case where U0 ≦ U3 (i.e., the voltage of the control signal is in the second voltage range), the power amplifier 1222 is in a linear amplification state, and the output power and the voltage of the control signal are expressed by the relation Pout ═ k (U), and k (U) is a function, as shown in fig. 2, the function is linear. It should be understood that in other embodiments, the functional relationship may be a nonlinear relationship, and it is sufficient that Pout ═ k (u) is fitted to be consistent with the actual curve.
In this range, the control unit 16 may decrease the voltage of the control signal so that the output power of the microwave signal is also decreased, and the control unit 16 may increase the voltage of the control signal so that the output power of the microwave signal is also increased. For example, in fig. 2, when the voltage U of the control signal is U1, the output power Pout is P1. When the voltage U of the control signal is U2, the output power Pout is P2, where U2> U1, and P2> P1.
In the case where U > U3 (i.e., the voltage of the control signal is in the third voltage range), the power amplifier 1222 is in a saturation state, Pout ═ P3.
This is explained below as an example.
In one example, the maximum output power of the microwave source 122 is Pmax 250W, U0 1.6V, and U3 3.3V.
When the voltage of the control signal is less than 1.6V, the power amplifier 1222 is in an off state, and the power amplifier 1222 is in an off state, so that the output power of the microwave signal is 0W.
When the voltage of the control signal is greater than or equal to 1.6V and less than or equal to 3.3V, the voltage of the control signal increases and the output power of the microwave signal also increases. The voltage of the control signal is reduced and the output power of the microwave signal is also reduced.
In the case where the voltage of the control signal is greater than 3.3V, the power amplifier 1222 is in a saturation state, and the output power of the microwave signal is at the maximum output power.
In some embodiments, referring to fig. 3, microwave heating assembly 10 includes an acquisition unit 20, acquisition unit 20 includes a directional coupler 202 and a detection element 204, directional coupler 202 is connected to power amplifier 1222 and radiating element 14, detection element 204 is connected to directional coupler 202, and control unit 16 is configured to receive the output power of the microwave signal and the reflected power of the microwave signal via detection element 204. In this way, the output power of the microwave signal fed into the cavity 18 through the radiation unit 14 and the reflected power of the microwave signal reflected in the cavity 18 can be collected by the collection unit 20.
Specifically, in the embodiment of the present invention, the power amplifier 1222 is connected to the directional coupler 202, the microwave signal of the power amplifier 1222 passes through the directional coupler 202 to output the output power of the microwave signal, the directional coupler 202 is connected to the radiating element 14 and the detecting element 204 to output the microwave signal to the radiating element 14 and the detecting element 204, the radiating element 14 feeds the microwave signal into the cavity 18, and the detecting element 204 detects the output power of the microwave signal. The reflected power of the microwave signal fed to the cavity 18 enters the directional coupler 202 through the radiation unit 14, and the reflected power of the microwave signal is detected by the detector 204. The detecting element 204 is connected to the control unit 16, and the control unit 16 is configured to receive the output power of the microwave signal and the reflected power of the microwave signal through the detecting element 204, where the output power of the microwave signal can be understood as the power of the microwave signal output by the power amplifier 1222, and can also be understood as the incident power of the microwave signal fed into the cavity 18.
The collecting unit 20 may collect the microwave signal reflected in the cavity 18 through the radiating unit 14, specifically, the radiating unit 14 may include a radio frequency connector and an antenna, the radio frequency connector receives the microwave signal and feeds the microwave signal into the cavity 18 through the antenna, the cavity 18 may reflect the fed microwave signal to form a reflected microwave signal, the reflected microwave signal may enter the radiating unit 14 from the antenna, and the collecting unit 20 may collect the reflected microwave signal from the radiating unit 14 and output the reflected power of the microwave signal to the control unit 16.
In some embodiments, referring to fig. 4, directional coupler 202 includes a forward coupler 2022 and a backward coupler 2024, detector element 204 includes a first detector element 2042 and a second detector element 2044, forward coupler 2022 is connected to first detector element 2042, backward coupler 2024 is connected to second detector element 2044, first detector element 2042 is configured to output the output power of the microwave signal, and second detector element 2044 is configured to output the reflected power of the microwave signal. In this way, the microwave signal can be coupled and collected through the directional coupler 202, and the output power and the reflected power of the microwave signal are output through the detector 204.
Specifically, forward coupler 2022 is configured to output the output power of the microwave signal and transmit the output power of the microwave signal to first detecting element 2042 through the output end of forward coupler 2022, and backward coupler 2024 is configured to output the reflected power of the microwave signal and transmit the reflected power of the microwave signal to second detecting element 2044 through the output end of backward coupler 2024.
In some embodiments, the power amplifier 1222 acts as a final amplifier for the microwave heating assembly 10. In this manner, the number of components of microwave heating assembly 10 may be reduced, further reducing the cost of microwave heating assembly 10 and microwave heating apparatus 100.
Specifically, the power amplifier 1222 performs final stage amplification on the output power of the microwave signal as a final stage amplifier, and the output power of the amplified microwave signal can be fed into the cavity 18 without being amplified by other amplifiers. This may reduce the number of components of microwave heating assembly 10, further reducing the cost of microwave heating assembly 10 and microwave heating apparatus 100. At the same time, the structure and circuit design of the microwave heating assembly 10 and the microwave heating device 100 can be self-simplified.
In some embodiments, referring to fig. 5, the control unit 16 includes a digital-to-analog converter 162, and the digital-to-analog converter 162 is configured to output a control signal. Thus, the power amplifier 1222 can be controlled by the digital signal through the dac 162, so as to control the output power of the microwave signal more precisely.
Specifically, the control accuracy of the digital signal is high, the voltage of the control signal is set through the digital signal, the implementation is easy, and the adjustment accuracy of the output power can be improved.
Referring to fig. 6, in an embodiment of the present invention, under the operation of the microwave heating assembly 10, a low-frequency microwave signal emitted from the microwave signal generator 13 is amplified by the power amplifier 1222, outputted to the directional coupler 202 for coupling collection, and radiated by the radiation unit 14, wherein the forward microwave signal passes through the forward coupler 2022, and a certain microwave signal is fed into the first detecting element 2042, the first detecting element 2042 detects a parameter of the forward microwave signal, and the control unit 16 obtains the output power of the microwave signal through the first detecting element 2042. The reflected microwave signal is coupled and collected by the backward coupler 2024, and a certain microwave signal is fed into the second detecting element 2044, and similarly, the second detecting element 2044 can detect parameters of the reflected microwave signal, so that the control unit 16 obtains the reflected power of the microwave signal through the second detecting element 2044. The control unit 16 is used for receiving the output of the first detecting element 2042 and the output of the second detecting element 2044, so as to collect the output power and the reflected power of the microwave signal.
A microwave heating apparatus 100 of the present embodiment comprises a cavity 18 and the microwave heating assembly 10 of any of the above embodiments, wherein a radiation unit 14 is used for feeding the microwave signal output by the power amplifier 1222 into the cavity 18.
Above-mentioned microwave heating equipment 100 adjusts the output of microwave signal through adjustment control signal to can need not to increase extra component (such as the numerical control attenuator), just can realize output's nimble change, reach control microwave signal's output's purpose, and can promote control power's precision through the accurate control to control signal, also reduced microwave heating assembly 10's cost simultaneously.
It should be noted that the above explanation of the embodiment and the advantageous effects of the microwave heating assembly 10 also applies to the microwave heating apparatus 100 of the present embodiment, and is not detailed here to avoid redundancy.
In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., 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 present 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.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A microwave heating assembly is characterized by comprising a heating unit, a radiation unit and a control unit, wherein the heating unit comprises a microwave source, the microwave source comprises a power amplifier, the radiation unit is used for radiating a microwave signal output by the power amplifier, the control unit is connected with the power amplifier, and the control unit is used for outputting a control signal to the power amplifier and adjusting the control signal to adjust the output power of the microwave signal; the microwave heating assembly is provided with a plurality of voltage ranges, each voltage range corresponds to the working state of the power amplifier, the working state of the power amplifier is related to the output power of the microwave signal, and the control unit is used for controlling the voltage of the control signal to be in different voltage ranges so as to adjust the output power of the microwave signal;
the plurality of voltage ranges includes a first voltage range, a second voltage range, and a third voltage range, the voltage of the first voltage range being less than the voltage of the second voltage range, the voltage of the second voltage range being less than the voltage of the third voltage range,
the power amplifier is in a cut-off state when the voltage of the control signal is in the first voltage range;
the power amplifier is in an amplifying state when the voltage of the control signal is in the second voltage range;
the power amplifier is in a saturation state when the voltage of the control signal is in the third voltage range.
2. A microwave heating assembly as in claim 1 wherein the adjustment step of the output power of the microwave signal is determined by the accuracy of the control signal.
3. A microwave heating assembly according to claim 1 wherein the microwave heating assembly comprises an acquisition unit, the acquisition unit comprising a directional coupler and a detection element, the directional coupler connecting the power amplifier and the radiating element, the detection element connecting the directional coupler, the control unit being configured to receive the output power of the microwave signal and the reflected power of the microwave signal via the detection element.
4. A microwave heating assembly in accordance with claim 3 wherein said directional coupler comprises a forward coupler and a backward coupler, said detecting element comprises a first detecting element and a second detecting element, said forward coupler is connected to said first detecting element, said backward coupler is connected to said second detecting element, said first detecting element is configured to output an output power of said microwave signal, and said second detecting element is configured to output a reflected power of said microwave signal.
5. A microwave heating assembly in accordance with claim 1 wherein the power amplifier acts as a final amplifier of the microwave heating assembly.
6. A microwave heating assembly as in claim 1 wherein the control unit comprises a digital to analog converter for outputting the control signal.
7. A microwave heating assembly in accordance with claim 1 wherein the power amplifier comprises a laterally diffused metal oxide semiconductor or gallium nitride transistor.
8. Microwave heating device, characterized in that it comprises a cavity and a microwave heating assembly according to any one of claims 1 to 7, and the radiation unit is used to feed the microwave signal output by the power amplifier into the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397291.1A CN111194109B (en) | 2019-12-30 | 2019-12-30 | Microwave heating assembly and microwave heating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397291.1A CN111194109B (en) | 2019-12-30 | 2019-12-30 | Microwave heating assembly and microwave heating equipment |
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| CN111194109A CN111194109A (en) | 2020-05-22 |
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