CN111031622B - Microwave heating assembly, microwave heating equipment and control method - Google Patents
Microwave heating assembly, microwave heating equipment and control method Download PDFInfo
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- CN111031622B CN111031622B CN201911401734.XA CN201911401734A CN111031622B CN 111031622 B CN111031622 B CN 111031622B CN 201911401734 A CN201911401734 A CN 201911401734A CN 111031622 B CN111031622 B CN 111031622B
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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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Abstract
The invention provides a microwave heating assembly, microwave heating equipment and a control method, wherein the microwave heating assembly comprises a heating unit, a collecting unit, a radiating unit and a control unit, the heating unit comprises a microwave source, the microwave source comprises a power amplifier, the collecting unit is connected with the power amplifier and the radiating unit, the radiating unit is used for enabling a microwave signal output by the power amplifier to radiate, the control unit is connected with the collecting unit, the collecting unit is used for collecting the output power of the microwave signal and the reflection power of the microwave signal, and the control unit is used for adjusting the output power of the microwave signal according to the reflection power of the microwave signal. The microwave heating assembly adjusts the output power through the reflected power, so that the output power of a microwave signal can be adjusted in real time through the reflected microwave energy, the damage of a power amplifier caused by overlarge reflected power is avoided, the purpose of protecting the power amplifier can be achieved without adding extra elements, and the cost of microwave heating equipment is reduced.
Description
Technical Field
The invention relates to the field of microwave equipment, in particular to a microwave heating assembly, microwave heating equipment and a control method.
Background
Currently, microwave heating devices may employ semiconductor microwave sources to generate microwaves for cooking food. In the related art, in order to prevent the power amplifier of the semiconductor microwave source from being damaged by the reflected microwave signal, the microwave heating apparatus employs a circulator to protect the power amplifier, and specifically, the reflected microwave signal can be guided away through the circulator without flowing back to the power amplifier, and the reflected microwave signal guided away through the circulator is absorbed by a load. However, such a protection method requires an additional circulator and a load for absorbing the reflected microwave signal in the microwave heating apparatus, which leads to an increase in the cost of the microwave heating apparatus.
Disclosure of Invention
The embodiment of the invention provides a microwave heating assembly, microwave heating equipment and a control method.
The microwave heating assembly comprises a heating unit, a collecting unit, a radiating unit and a control unit, wherein the heating unit comprises a microwave source, the microwave source comprises a power amplifier, the collecting unit is connected with the power amplifier and the radiating unit, the radiating unit is used for radiating a microwave signal output by the power amplifier, the control unit is connected with the collecting unit, the collecting unit is used for collecting the output power of the microwave signal and the reflection power of the microwave signal, and the control unit is used for adjusting the output power of the microwave signal according to the reflection power of the microwave signal.
According to the microwave heating assembly, the output power of the microwave signal is adjusted through the reflected power of the microwave signal, so that the output power of the microwave signal can be adjusted in real time according to microwave reflected energy, and the power amplifier is prevented from being damaged due to overlarge reflected power, the purpose of protecting the power amplifier can be achieved without adding extra elements (such as a circulator and a load), and the cost of the microwave heating assembly and equipment is reduced.
In some embodiments, the microwave heating assembly is provided with a plurality of power ranges, each power range corresponds to an output power, and the control unit is configured to adjust the output power of the microwave signal according to the power range in which the reflected power of the microwave signal is located and the output power corresponding to the power range. Therefore, the efficiency of determining the power range in which the reflected power of the microwave signal is located is high, and the output power of the microwave signal can be rapidly determined according to the corresponding power range.
In some embodiments, the plurality of power ranges includes a first power range, a second power range, and a third power range, the power of the first power range being greater than the power of the second power range, the power of the second power range being greater than the power of the third power range,
the control unit is used for controlling the power amplifier to be switched off under the condition that the reflected power is in the first power range;
the control unit is used for adjusting the output power of the microwave signal to be a first output power under the condition that the reflected power is in the second power range;
the control unit is used for adjusting the output power of the microwave signal to be a second output power under the condition that the reflected power is in the third power range;
wherein the second output power is greater than the first output power. Therefore, the control unit can quickly determine the output power of the microwave signal according to the specific power range of the reflected power, so that the reflected power can be in a proper range, and the power amplifier can be reliably and quickly protected.
In some embodiments, the second output power is a maximum output power of the power amplifier. Therefore, the power amplifier can achieve better output power.
In some embodiments, the collection unit includes a directional coupler, a first detector and a second detector, the directional coupler connects the power amplifier and the radiation unit, the first detector and the second detector connect the directional coupler, and the control unit is configured to receive the output power of the microwave signal via the first detector and the reflected power via the second detector. Therefore, the microwave signals can be coupled and collected through the directional coupler.
In some embodiments, the control unit comprises an operational amplifier, the operational amplifier comprises a first input terminal, a second input terminal, a third input terminal and an output terminal, the first input terminal is connected to the first detector element and is used for receiving the output power, the second input terminal is connected to the second detector element and is used for receiving the reflected power, the third input terminal is used for receiving a grid voltage control signal, the output terminal is connected to the power amplifier, and the voltage output by the output terminal is used for controlling the output power of the microwave signal. Therefore, according to different grid voltage control signals, the reflected power which can be born by the power amplifier can be obtained through power adjustment with a certain amplitude according to different reflected powers.
In some embodiments, the control unit comprises a controller connected to the third input terminal, the controller being configured to input the gate voltage control signal to the third input terminal. Therefore, different grid voltage control signals are output through the controller, the output power of the power amplifier is further controlled, and the power amplifier can be protected.
The microwave heating device comprises a cavity and the microwave heating assembly in any one of the above embodiments, wherein the radiation unit is used for feeding a microwave signal output by the power amplifier into the cavity, and the acquisition unit is used for acquiring reflected power of the microwave signal reflected by the cavity.
According to the microwave heating equipment, the output power of the microwave signal is adjusted through the reflected power of the microwave signal, so that the output power of the microwave signal can be adjusted in real time according to microwave reflected energy, the power amplifier is prevented from being damaged due to overlarge reflected power, the purpose of protecting the power amplifier can be achieved without adding extra elements (such as a circulator and a load), and the cost of the microwave heating equipment is reduced.
The control method of the embodiment of the invention is used for a microwave heating assembly, the microwave heating assembly comprises a heating unit and a radiation unit, the heating unit comprises a microwave source, the microwave source comprises a power amplifier, the radiation unit is used for radiating microwave signals output by the power amplifier,
the control method comprises the following steps:
collecting the reflected power of the microwave signal;
and adjusting the output power of the microwave signal according to the reflected power of the microwave signal.
According to the control method, the output power of the microwave signal is adjusted through the reflected power of the microwave signal, so that the output power of the microwave signal can be adjusted in real time according to microwave reflected energy, and the power amplifier is prevented from being damaged due to overlarge reflected power, the purpose of protecting the power amplifier can be achieved without adding extra elements (such as a circulator and a load), and the cost of microwave heating equipment is reduced.
In some embodiments, the microwave heating assembly is provided with a plurality of power ranges, each power range corresponding to an output power, and the output power of the microwave signal is adjusted according to the reflected power of the microwave signal, including:
and adjusting the output power of the microwave signal according to the power range in which the reflected power of the microwave signal is located and the output power corresponding to the power range. Therefore, the efficiency of determining the power range in which the reflected power of the microwave signal is located is high, and the output power of the microwave signal can be rapidly determined according to the corresponding power range.
In some embodiments, the plurality of power ranges includes a first power range, a second power range, and a third power range, the power of the first power range being greater than the power of the second power range, the power of the second power range being greater than the power of the third power range,
adjusting the output power of the microwave signal according to the power range where the reflected power of the microwave signal is located and the output power corresponding to the power range, including:
controlling the power amplifier to turn off if the reflected power is in the first power range;
under the condition that the reflected power is in the second power range, adjusting the output power of the microwave signal to be first output power;
under the condition that the reflected power is in the third power range, adjusting the output power of the microwave signal to be second output power;
wherein the second output power is greater than the first output power.
In some embodiments, the second output power is a maximum output power of the power amplifier.
In some embodiments, the microwave heating apparatus includes a collection unit that collects reflected power of the microwave signal, including:
the collecting unit collects the reflected power of the microwave signal. Therefore, the control unit can control the power amplifier or adjust the output power of the microwave signal under different conditions according to the reflected power, so that the reflected power can be output to the power amplifier within a proper range, and the power amplifier is further reliably protected.
In some embodiments, the acquisition unit includes a directional coupler connecting the power amplifier and the radiation unit, a first detector element and a second detector element connecting the directional coupler. Therefore, the microwave signals can be coupled and collected through the directional coupler.
In some embodiments, the microwave heating assembly comprises an operational amplifier, the operational amplifier comprising a first input terminal, a second input terminal, a third input terminal, and an output terminal, the first input terminal is connected to the first detector element and is configured to receive the output power of the microwave signal, the second input terminal is connected to the second detector element and is configured to receive the reflected power, the third input terminal is configured to receive a gate voltage control signal, the output terminal is connected to the power amplifier, and the output terminal outputs a voltage for controlling the output power of the microwave signal. Therefore, according to different grid voltage control signals, the reflected power in different power ranges can be adjusted through power with a certain amplitude, and the output power which can be born by the power amplifier can be obtained.
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 another schematic block diagram of a microwave heating apparatus in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of yet another module of a microwave heating apparatus in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram 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 flow chart of a control method of an embodiment of the present invention;
FIG. 7 is another schematic flow chart diagram of a control method according to an embodiment of the present invention;
fig. 8 is another flowchart illustrating a control method 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.
The embodiment of the invention provides a microwave heating assembly 11, a microwave heating device 100 and a control method.
Referring to fig. 1, a microwave heating assembly 11 according to an embodiment of the present invention includes a heating unit 14, an acquisition unit 16, a radiation unit 13, and a control unit 18, where the heating unit 14 includes a microwave source 142, the microwave source 142 includes a power amplifier 1422, the acquisition unit 16 is connected to the power amplifier 1422 and the radiation unit 13, the radiation unit 13 is configured to radiate a microwave signal output by the power amplifier 1422, the control unit 18 is connected to the acquisition unit 16 and the heating unit 14, the acquisition unit 16 is configured to acquire reflected power of the microwave signal, and the control unit 18 is configured to adjust output power of the microwave signal according to the reflected power of the microwave signal.
The embodiment of the present invention further provides a microwave heating apparatus 100, which includes a microwave heating assembly 11 and a cavity 12, wherein the radiation unit 13 is configured to feed a microwave signal output by the power amplifier 1422 into the cavity 12, and the collection unit 16 is configured to collect reflected power of the microwave signal reflected by the cavity 12.
The microwave heating assembly 11 and the microwave heating apparatus 100 adjust the output power of the microwave signal according to the reflected power of the microwave signal, so that the output power of the microwave signal can be adjusted in real time according to the reflected microwave energy, and damage to the power amplifier 1422 due to excessive reflected power is avoided, and thus the purpose of protecting the power amplifier 1422 can be achieved without adding additional elements (such as a circulator and a load), and the cost of the microwave heating assembly 11 and the microwave heating apparatus 100 is reduced.
In the related technology, the reflected power of the microwave signal is too large, which can damage the power amplifier of the semiconductor microwave source, thereby causing the microwave heating component to be damaged, the microwave heating component mostly adopts a circulator with high power capacity to isolate the reflected power, so as to protect the power amplifier, the reflected microwave signal is guided away through the characteristic of annular input and output of a port of the circulator, the reflected power of the microwave signal reflected in the cavity is absorbed by a load, and further the power amplifier of the semiconductor microwave source is protected, thus, the complexity of the microwave heating device is increased, the power capacity of the circulator has higher requirements, and the integral production cost of the microwave heating device is greatly influenced. In order to achieve the desired heating effect and protect the power amplifier, and to reduce the cost of the microwave heating device, it is necessary to improve the structure of the microwave heating device.
Specifically, referring to fig. 1, in this embodiment, the microwave heating assembly 11 emits a microwave signal to heat food in the cavity 12, the cavity 12 can be used to contain food to be heated, when the microwave heating assembly works, the microwave source 142 in the heating unit 14 emits a low-power microwave signal, the microwave signal is amplified by the power amplifier 1422 of the microwave source 142 and output to the collecting unit 16, the collecting unit 16 collects the microwave signal and outputs the obtained microwave signal to the radiating unit 13, the radiating unit 13 feeds the microwave signal into the cavity 12 to heat the food in the cavity 12, further, the microwave signal reflected in the cavity 12 (including the microwave signal reflected by the food and reflected by the inner wall of the cavity 12) enters the control unit 18 through the radiating unit 13 and the collecting unit 16, at this time, the control unit 18 can control the microwave heating assembly according to the reflected power of the microwave signal reflected in the cavity 12, further, the output power of the microwave signal of the power amplifier 1422 is adjusted, and the control unit 18 limits the power of the reflected microwave signal, so that the damage of the reflected power of the microwave signal to the power amplifier 1422 is reduced, and the protection of the power amplifier 1422 is realized.
It will be appreciated that the control unit 18 is configured to adjust the reflected power to be less than or equal to the reflected power that the power amplifier 1422 can withstand. That is, the control unit 18 adjusts the output power of the microwave signal according to the reflected power of the power amplifier 1422, and the adjusted output power of the microwave signal is such that the reflected power is not greater than the reflected power that the power amplifier 1422 can bear.
The microwave source 142 may comprise a semiconductor microwave source. The microwave source 142 may further include a semiconductor microwave signal generator, a heat sink, and the like, wherein the semiconductor microwave signal generator may generate a microwave signal, an input end of the power amplifier 1422 is connected to the semiconductor microwave signal generator, and the microwave signal is input through the input end of the power amplifier 1422 and is output through an output end of the power amplifier 1422 after being amplified. The heat sink may dissipate heat from the microwave source 142. The power amplifier 1422 may include a power amplifier tube.
In some embodiments, the microwave heating assembly 11 is provided with a plurality of power ranges, each power range corresponding to an output power, and the control unit 18 is configured to adjust the output power of the microwave signal according to the power range in which the reflected power of the microwave signal is located and the output power corresponding to the power range. Therefore, the efficiency of determining the power range in which the reflected power of the microwave signal is located is high, and the output power of the microwave signal can be rapidly determined according to the corresponding power range.
Specifically, the microwave heating assembly 11 may correspond to different output powers in different power ranges, and the output power is analyzed and adjusted by the control unit 18 in the different power ranges, and is adjusted to the output power of the appropriate microwave signal, so as to protect the power amplifier 1422.
The number of power ranges may be determined based on the accuracy or requirements of the microwave heating assembly 11 for adjustment. In some embodiments below, the plurality of power ranges may include three power ranges. The embodiments of the present invention are not particularly limited.
In some embodiments, the plurality of power ranges includes a first power range, a second power range, and a third power range, the power of the first power range being greater than the power of the second power range, the power of the second power range being greater than the power of the third power range,
in case the reflected power is in the first power range, the control unit 18 is configured to control the power amplifier 1422 to be turned off;
in case the reflected power is in the second power range, the control unit 18 is configured to adjust the output power of the microwave signal to the first output power;
in case the reflected power is in the third power range, the control unit 18 is configured to adjust the output power of the microwave signal to the second output power;
wherein the second output power is greater than the first output power. In this way, the control unit 18 can quickly determine the output power of the microwave signal according to the specific power range in which the reflected power is located, so that the reflected power can be in an appropriate range, and the power amplifier 1422 can be reliably and quickly protected.
Specifically, the power of the first power range is greater than the power of the second power range, and the power of the second power range is greater than the power of the third power range, that is, the first power range, the second power range, and the third power range may be set in segments according to the power of continuous intervals, and the power ranges may be specifically set in the control unit 18 of the microwave heating assembly 11, and the control unit 18 adjusts the output power of the microwave signal according to that the reflected power is in different power ranges, so that the reflected power is not greater than the reflected power that the power amplifier 1422 can bear when the reflected power enters the power amplifier 1422, and further the power amplifier 1422 is protected. It is understood that in other embodiments, the power range may be provided in other parts of microwave heating assembly 11 or microwave heating apparatus 100, or in microwave heating assembly 11, microwave heating apparatus 100 being obtained from a server via a network.
In one example, the first power range can be considered as a power range beyond what the power amplifier 1422 can withstand, and in the case that the reflected power is in the first power range, the reflected power is too large, which may cause the power amplifier 1422 to be damaged, and therefore, the control unit 18 controls the power amplifier 1422 to be turned off, so that the output power of the power amplifier 1422 is zero, and the reflected power is prevented from entering the power amplifier 1422 and damaging the microwave heating assembly 11. The second power range can be considered as a power range that can be borne by the power amplifier 1422, and is a common operating area of the power amplifier 1422, and in the case that the reflected power is in the second power range, the control unit 18 can adjust the output power of the microwave signal to the first output power, and the magnitude of the first output power can be determined according to the power magnitude that can be borne by the power amplifier 1422. The third power range can be regarded as a high-power working area of the power amplifier 1422, and when the reflected power is in the third power range, the reflected power is smaller, and the reflected power does not damage the power amplifier 1422 at this time, and meanwhile, in order to enable the food in the cavity 12 to achieve a faster heating effect, the control unit 18 can adjust the output power of the microwave signal to be the second output power, so that the output power of the power amplifier 1422 is maintained to be the second output power. Wherein the second output power is greater than the first output power. In this way, the control unit 18 can adjust the output power of the power amplifier 1422 according to the reflected power being in different power ranges, further protecting the power amplifier 1422 and better adapting to the reflected power of the microwave signal.
In some embodiments, the second output power is the maximum output power of the power amplifier 1422. Thus, the power amplifier 1422 can achieve better output power.
Specifically, when the reflected power is within the third power range, the control unit 18 controls the output power of the microwave signal to be the second output power, which is the maximum output power of the power amplifier 1422, so that the food in the cavity 12 can achieve a better heating effect. At this time, the reflected power of the microwave signal is within a range that the power amplifier 1422 can endure.
In some embodiments, referring to fig. 2, the collecting unit 16 includes a first detecting element 162, a directional coupler 164 and a second detecting element 166, the directional coupler 164 connects the power amplifier 1422 and the radiating unit 13, the first detecting element 162 and the second detecting element 166 connect the directional coupler 164, and the control unit 18 is configured to receive the output power of the microwave signal through the first detecting element 162 and the reflected power of the microwave signal through the second detecting element 166. In this way, the microwave signal can be coupled and collected through the directional coupler 164.
Specifically, in an embodiment of the present invention, the directional coupler 164 may include a forward coupler and a backward coupler. The forward coupler is used for outputting the output power of the microwave signal and transmitting the output power of the microwave signal to the first detector element 162 through the first output terminal 1642, and the backward coupler is used for outputting the reflected power of the microwave signal and transmitting the reflected power of the microwave signal to the second detector element 166 through the second output terminal 1644. The output power of the microwave signal may be understood as the power of the microwave signal output by the power amplifier 1422, and may also be understood as the incident power of the microwave signal fed into the cavity 12.
It can be understood that, in the case of the operation of the microwave heating assembly 11, the low frequency microwave signal emitted from the microwave signal generator is amplified by the power amplifier 1422, outputted to the directional coupler 164 for coupling collection, and radiated by the radiation unit 13, wherein the forward microwave signal passes through the forward coupler, and a certain microwave signal is fed into the first detection element 162, and the first detection element 162 detects a parameter of the forward microwave signal, so that the control unit 18 obtains the output power of the microwave signal through the first detection element 162. The reflected microwave signal is coupled and collected by the back coupler, and a certain microwave signal is fed into the second detecting element 166, and similarly, the second detecting element 166 can detect the parameter of the reflected microwave signal, so that the control unit 18 obtains the reflected power of the microwave signal through the second detecting element 166. The control unit 18 is used for receiving the output of the first detector element 162 and the output of the second detector element 166, and further collecting the output power and the reflected power of the microwave signal.
The collection unit 16 may collect the reflected microwave signal reflected in the cavity 12 through the radiation unit 13, specifically, the radiation unit 13 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 12 through the antenna, the cavity 12 may reflect the fed microwave signal to form a reflected microwave signal, the reflected microwave signal may enter the radiation unit 13 from the antenna, and the collection unit 16 may collect the reflected microwave signal from the radiation unit 13 and output the reflected power of the microwave signal to the control unit 18.
In some embodiments, referring to fig. 3, control unit 18 includes an operational amplifier 182, where operational amplifier 182 includes a first input 1822, a second input 1824, a third input 1826, and an output 1828, where first input 1822 is connected to first detector 162 and is configured to receive the output power of the microwave signal, second input 1824 is connected to second detector 166 and is configured to receive the reflected power of the microwave signal, third input 1826 is configured to receive the gate voltage control signal, output 1828 is connected to power amplifier 1422, and the voltage output by output 1828 is configured to control the output power of the microwave signal. Therefore, according to different grid voltage control signals, according to different reflection powers, the reflection power which can be borne by the power amplifier 1422 can be obtained through power adjustment with a certain amplitude.
Specifically, operational amplifier 182 has four ports, three input ports and one output port 1828, a first input port 1822 is connected to first detector 162, first detector 162 can detect the microwave signal by using the nonlinearity of the crystal diode to convert the microwave signal into a direct current (e.g., voltage signal) or low frequency signal, and further transmit the microwave signal to operational amplifier 182 via first input port 1822, so that operational amplifier 182 receives the output power of the microwave signal emitted at present, a second input port 1824 is connected to second detector 166, and similarly, second detector 166 can detect the microwave signal by using the nonlinearity of the crystal diode, convert the microwave signal into a direct current (e.g., voltage signal) or low frequency signal, and further transmit the microwave signal to operational amplifier 182 via second input port 1824, so that operational amplifier 182 receives the reflected power of the microwave signal reflected in cavity 12, the third input 1826 of the operational amplifier 182 receives the gate voltage control signal, so that the reflected power that the power amplifier 1422 can bear can be obtained by adjusting the power with a certain amplitude according to different reflected powers according to different gate voltage control signals.
In some embodiments, referring to fig. 4, the microwave heating assembly 11 includes a controller 184, the controller 184 is connected to the third input 1826, and the controller 184 is configured to input the gate voltage control signal to the third input 1826. Thus, the controller 184 outputs different gate voltage control signals to control the output power of the power amplifier 1422, thereby ensuring that the power amplifier 1422 can be protected.
Specifically, the controller 184 can be used to output different gate voltage control signals, and generally, the output power of the microwave signal of the power amplifier 1422 can be determined by the voltage output by the output terminal 1828 (the voltage output by the output terminal 1828 is the signal for driving the power amplifier 1422), and in the case that the power amplifier 1422 is in the linear amplification region, the voltage output by the output terminal 1828 is proportional to the output power. The voltage output by the output terminal 1828 can be used to adjust the output power of the microwave signal of the power amplifier 1422, thereby controlling the output power of the power amplifier 1422.
The controller 184 is also coupled to the first detector element 162 and the second detector element 166 to collect the output power and the reflected power of the microwave signal, so that the microwave heating assembly 11 can sense the current port mismatch condition. Under the condition that the microwave heating assembly 11 is in operation, the microwave signal passes through the power amplifier 1422 to be amplified to a required power level, a portion of the microwave signal is output to the radiation unit 13 through the directional coupler 164, and is fed into the cavity 12 from the radiation unit 13, another portion of the microwave signal is coupled through the forward coupler, and enters the first detection element 162 to detect parameters of the microwave signal, and the first detection element 162 converts the microwave signal into a direct-current voltage signal, that is, a forward detection signal, which can be fed back to the controller 184 and the operational amplifier 182, so that the control unit 18 collects the output power of the microwave signal and senses the forward transmission power value of the microwave signal currently transmitted by the power amplifier 1422. When the microwave signal is fed into the cavity 12, a certain amount of reflected microwave signal is reflected from the cavity 12 to the radiation unit 13, the reflected microwave signal enters the backward coupler, and the second detection element 166 connected to the backward coupler converts the reflected power of the reflected microwave signal into a dc voltage signal, i.e., a backward detection signal, and inputs the dc voltage signal to the control unit 18, so that the control unit 18 can sense the reflected power of the current microwave signal, and further control the output power of the microwave signal. This not only protects the power amplifier 1422 from being damaged by excessive reflected power, but also ensures that the power amplifier 1422 can output maximum output power.
In some embodiments, the voltage output by the output 1828 is positively correlated to the voltage of the gate voltage control signal. Thus, the microwave heating element 11 can adjust the output power according to the relationship between the voltage of the gate voltage control signal and the voltage output by the output terminal 1828, and thus the purpose of protecting the power amplifier 1422 can be achieved without using additional components (such as a circulator and a load for absorbing the reflected power of the microwave signal).
Specifically, referring to fig. 4, when the microwave heating element 11 is operated and the power amplifier 1422 is in the linear amplification region, the voltage of the gate voltage control signal is in positive correlation with the voltage output by the output terminal 1828, the voltage output by the output terminal 1828 increases with the increase of the voltage of the gate voltage control signal, decreases with the decrease of the voltage of the gate voltage control signal, and the voltage output by the output terminal 1828 is in positive correlation with the output power of the power amplifier 1422. In one example, let U1 represent the gate voltage control signal output by the controller 184, U2 represent the voltage value of the output power, U3 represent the voltage value of the reflected power, the output voltage of the operational amplifier 182 is U4, and U4 is U4 ═ U1-U2) + (U1-U3) as the voltage signal for controlling the output power of the power amplifier 1422.
When the operation is started, the voltage value U3 of the reflected power is sent to both the controller 184 and the operational amplifier 182, and the controller 184 compares the regulated gate voltage control signal U1 through the analysis of the voltage value U3 of the reflected power and the operational amplifier 182 in combination with the voltage value U2 of the output power. The microwave heating element 11 may be pre-stored with the gate voltage control signal U1, and the output power voltage value U2, the reflected power voltage value U3 and the gate voltage control signal U1 are compared with each other in the operational amplifier 182. When the controller 184 analyzes the voltage U3 of the reflected power to find that the voltage U3 is too large (e.g., greater than a certain set value), in combination with the fact that U4 is (U1-U2) + (U1-U3), the gate voltage control signal U1 is adjusted to change according to the voltage value U2 of the output power and the voltage value U3 of the reflected power, and when U3 is too large, the controller controls U1 to decrease, and further controls U4 to decrease, so that U3 decreases to enable the reflected power that the power amplifier 1422 can bear. In summary, the magnitude of the decrease or increase of the gate voltage control signal U1 is different due to the difference of the voltage value U3 of the reflected power, and the magnitude of the decrease or increase is determined by the value of the reflected power that the power amplifier 1422 can endure.
The adjusted gate voltage control signal is input to the operational amplifier 182, and the operational amplifier 182 performs processing to adaptively adjust the voltage U4 output to the output terminal 1828 of the power amplifier 1422, thereby adjusting the output power level of the power amplifier 1422.
The reflection threshold point is set by adjusting the voltage value of the output power. In one embodiment, let a and B denote preset values of reflected power, which are determined by the range of reflected power that the power amplifier 1422 can withstand, with X, where B is less than a,
in the case where X > a, the controller 184 turns off the gate voltage control signal so that the power amplifier 1422 is turned off, and the output power Pout of the power amplifier 1422 becomes 0W, in which case X is in the first power range (a, + ∞);
in the case that B is not less than X is not less than a, the controller 184 may decrease the gate voltage control signal so that the output power of the power amplifier 1422 is Pout not less than P1, where P1 is the forward transmission power value corresponding to the reverse power value that the current power amplifier 1422 can bear. In this case, X is located in a second power range [ B, A ];
when X < B, the controller 184 adjusts the gate voltage control signal so that the maximum power Pout of the output of the power amplifier 1422 becomes Pmax, and in this case, X is in the third power range (0, B). This is explained below as an example.
In one example, the maximum output power of the microwave source 142 is Pmax 250W, a 200W, and B100W.
In the case that the reflected power is greater than 200W, the reflected power may cause the power amplifier to be destroyed, so that the reflected power is input to the controller 184, and the controller 184 turns off the gate voltage control signal, so that the gate voltage control signal is reduced to 0, and thus the power amplifier 1422 is turned off.
When the reflected power is greater than or equal to 100W and less than or equal to 200W, the voltage of the gate voltage control signal is positively correlated with the voltage output from the output terminal 1828, so that the gate voltage control signal is controlled to decrease, and the output power of the power amplifier 1422 is also decreased accordingly.
In the case where the reflected power is less than or equal to 100W, the controller 184 controls the magnitude of the gate voltage control signal so that the output power of the power amplifier 1422 is 250W.
The microwave heating apparatus 100 according to an embodiment of the present invention includes a cavity 12 and a microwave heating assembly 11 according to any one of the above embodiments, wherein the radiation unit 13 is configured to feed a microwave signal output by the power amplifier 1422 into the cavity 12, the collection unit 16 is configured to collect output power of the microwave signal and reflected power of the microwave signal reflected by the cavity 12, and the control unit 18 is configured to adjust the output power of the microwave signal according to the reflected power of the microwave signal.
In the microwave heating device 100, the output power of the microwave signal is adjusted by the reflected power of the microwave signal, so that the output power of the microwave signal can be adjusted in real time according to the microwave energy absorbed in the cavity 12, and damage to the power amplifier 1422 due to excessive reflected power is avoided, and thus the purpose of protecting the power amplifier 1422 can be achieved without adding additional elements (such as a circulator and a load), and the cost of the microwave heating device 100 is reduced.
It should be noted that the above explanation of the embodiment and the advantageous effects of the microwave heating assembly 11 is also applicable to the microwave heating apparatus 100 of the present embodiment, and is not detailed here to avoid redundancy.
Referring to fig. 6, a control method according to an embodiment of the present invention is applied to a microwave heating assembly 11, the microwave heating assembly 11 includes a heating unit 14 and a radiation unit 13, the heating unit 14 includes a microwave source 142, the microwave source 142 includes a power amplifier 1422, the radiation unit 13 is configured to radiate a microwave signal output by the power amplifier 1422,
the control method comprises the following steps:
and step 03, adjusting the output power of the microwave signal according to the reflected power of the microwave signal.
According to the control method, the output power of the microwave signal can be adjusted through the reflected power of the microwave signal, so that the output power of the microwave signal can be adjusted in real time according to the microwave energy absorbed in the cavity 12, and the power amplifier 1422 is prevented from being damaged due to overlarge reflected power, and therefore the purpose of protecting the power amplifier 1422 can be achieved without adding extra elements (such as a circulator and a load), and the cost of the microwave heating device 100 is reduced.
It should be noted that the above explanation of the embodiments and the advantageous effects of the microwave heating assembly 11 and the microwave heating apparatus 100 also apply to the control method of the present embodiment, and the detailed explanation is omitted here to avoid redundancy.
Referring to fig. 7, in some embodiments, the microwave heating assembly 11 has a plurality of power ranges, each power range corresponding to an output power, and step 03 includes:
and step 05, adjusting the output power of the microwave signal according to the power range where the reflected power of the microwave signal is located and the output power corresponding to the power range. Therefore, the efficiency of determining the power range in which the reflected power of the microwave signal is located is high, and the output power of the microwave signal can be rapidly determined according to the corresponding power range.
Referring to fig. 8, in some embodiments, the plurality of power ranges includes a first power range, a second power range and a third power range, the power of the first power range is greater than the power of the second power range, the power of the second power range is greater than the power of the third power range,
073, adjusting the output power of the microwave signal to a second output power under the condition that the reflected power is in a third power range.
Wherein the second output power is greater than the first output power. In this way, the control unit 18 can control the power amplifier 1422 or adjust the output power of the microwave signal according to the reflected power under different conditions, so that the reflected power can be output to the power amplifier 1422 within an appropriate range, and further reliably protect the power amplifier 1422.
In some embodiments, the second output power is the maximum output power of the power amplifier 1422. Thus, the power amplifier 1422 can achieve better output power.
In some embodiments, microwave heating assembly 11 includes a collection unit 16 that collects reflected power of a microwave signal, including:
the collecting unit 16 collects the reflected power of the microwave signal reflected by the cavity 12.
In some embodiments, acquisition unit 16 includes a directional coupler 164, a first detector element 162, and a second detector element 166, wherein directional coupler 164 connects power amplifier 1422 and radiating element 13, and first detector element 162 and second detector element 166 connect directional coupler 164. In this way, the microwave signal can be coupled and collected through the directional coupler 164.
In some embodiments, microwave heating assembly 11 includes an operational amplifier 182, where operational amplifier 182 includes a first input 1822, a second input 1824, a third input 1826, and an output 1828, where first input 1822 is coupled to first detector 162 and is configured to receive the output power of the microwave signal, second input 1824 is coupled to second detector 166 and is configured to receive the reflected power, third input 1826 is configured to receive the gate voltage control signal, output 1828 is coupled to power amplifier 1422, and the voltage output by output 1828 is configured to control the output power of the microwave signal. Therefore, according to different grid voltage control signals, reflected power within different power ranges can be adjusted by a certain amplitude of power, so as to obtain output power that can be borne by the power amplifier 1422.
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 (11)
1. A microwave heating assembly is characterized by comprising a heating unit, a collecting unit, a radiating unit and a control unit, wherein the heating unit comprises a microwave source, the microwave source comprises a power amplifier, the collecting unit is connected with the power amplifier and the radiating unit, the radiating unit is used for radiating a microwave signal output by the power amplifier, the control unit is connected with the collecting unit and the heating unit, the collecting unit is used for collecting the reflection power of the microwave signal, and the control unit is used for adjusting the output power of the microwave signal according to the reflection power of the microwave signal;
the microwave heating assembly is provided with a plurality of power ranges, each power range corresponds to one output power, and the control unit is used for adjusting the output power of the microwave signal according to the power range where the reflected power of the microwave signal is located and the output power corresponding to the power range;
the plurality of power ranges includes a first power range, a second power range, and a third power range, the first power range having a power greater than the second power range, the second power range having a power greater than the third power range,
the control unit is used for controlling the power amplifier to be switched off under the condition that the reflected power is in the first power range;
the control unit is used for adjusting the output power of the microwave signal to be a first output power under the condition that the reflected power is in the second power range;
the control unit is used for adjusting the output power of the microwave signal to be a second output power under the condition that the reflected power is in the third power range;
wherein the second output power is greater than the first output power.
2. A microwave heating assembly in accordance with claim 1 wherein the second output power is a maximum output power of the power amplifier.
3. A microwave heating assembly in accordance with claim 1 wherein said pickup unit comprises a directional coupler, a first detector element and a second detector element, said directional coupler connecting said power amplifier and said radiating unit, said first detector element and said second detector element connecting said directional coupler, said control unit for receiving output power of said microwave signal through said first detector element and receiving said reflected power through said second detector element.
4. A microwave heating assembly according to claim 3 wherein the control unit comprises an operational amplifier, the operational amplifier comprising a first input terminal coupled to the first detector element for receiving the output power, a second input terminal coupled to the second detector element for receiving the reflected power, a third input terminal coupled to the power amplifier for receiving a gate voltage control signal, and an output terminal for outputting a voltage for controlling the output power of the microwave signal.
5. A microwave heating assembly as in claim 4 wherein the control unit comprises a controller, the controller being connected to the third input, the controller being configured to cause the gate voltage control signal to be input to the third input.
6. Microwave heating equipment, characterized in that, it includes cavity and microwave heating assembly as claimed in any one of claims 1-5, the radiation unit is used to feed the microwave signal outputted by the power amplifier into the cavity, and the collection unit is used to collect the reflected power of the microwave signal reflected by the cavity.
7. A control method for a microwave heating assembly, wherein the microwave heating assembly comprises a heating unit and a radiation unit, the heating unit comprises a microwave source, the microwave source comprises a power amplifier, the radiation unit is used for radiating microwave signals output by the power amplifier,
the control method comprises the following steps:
collecting the reflected power of the microwave signal;
adjusting the output power of the microwave signal according to the reflected power of the microwave signal;
the microwave heating assembly is provided with a plurality of power ranges, each power range corresponds to an output power, and the output power of the microwave signal is adjusted according to the reflected power of the microwave signal, and the microwave heating assembly comprises:
adjusting the output power of the microwave signal according to the power range of the reflected power of the microwave signal and the output power corresponding to the power range;
the plurality of power ranges includes a first power range, a second power range, and a third power range, the first power range having a power greater than the second power range, the second power range having a power greater than the third power range,
adjusting the output power of the microwave signal according to the power range where the reflected power of the microwave signal is located and the output power corresponding to the power range, including:
controlling the power amplifier to turn off if the reflected power is in the first power range;
under the condition that the reflected power is in the second power range, adjusting the output power of the microwave signal to be first output power;
under the condition that the reflected power is in the third power range, adjusting the output power of the microwave signal to be second output power;
wherein the second output power is greater than the first output power.
8. The control method of claim 7, wherein the second output power is a maximum output power of the power amplifier.
9. The control method of claim 7, wherein the microwave heating assembly comprises a pick-up unit,
the acquisition unit is used for acquiring the reflected power of the microwave signal.
10. The control method of claim 9, wherein the collection unit comprises a directional coupler, a first detector element and a second detector element, the directional coupler connects the power amplifier and the radiation unit, and the first detector element and the second detector element connect the directional coupler.
11. The control method of claim 10, wherein the microwave heating assembly comprises an operational amplifier, the operational amplifier comprises a first input terminal, a second input terminal, a third input terminal and an output terminal, the first input terminal is connected to the first detector element and is used for receiving the output power of the microwave signal, the second input terminal is connected to the second detector element and is used for receiving the reflected power, the third input terminal is used for receiving the grid voltage control signal, the output terminal is connected to the power amplifier, and the voltage output by the output terminal is used for controlling the output power of the microwave signal.
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| CN112291877B (en) * | 2020-10-20 | 2022-05-31 | 广东美的厨房电器制造有限公司 | Control method and microwave heating device |
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Effective date of registration: 20230330 Address after: No. 5, Yong'an Road, Beijiao Town, Shunde District, Foshan City, Guangdong Province, 528311 Patentee after: GUANGDONG WITOL VACUUM ELECTRONIC MANUFACTURE Co.,Ltd. Address before: 528311 Yongan Road, Beijiao Town, Shunde District, Foshan, Guangdong 6 Patentee before: GUANGDONG MIDEA KITCHEN APPLIANCES MANUFACTURING Co.,Ltd. Patentee before: MIDEA GROUP Co.,Ltd. |