CN109587861B - Multi-frequency solid-state microwave oven and heating method using same - Google Patents
Multi-frequency solid-state microwave oven and heating method using same Download PDFInfo
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- CN109587861B CN109587861B CN201811634564.5A CN201811634564A CN109587861B CN 109587861 B CN109587861 B CN 109587861B CN 201811634564 A CN201811634564 A CN 201811634564A CN 109587861 B CN109587861 B CN 109587861B
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/02—Stoves or ranges heated by electric energy using microwaves
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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
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Abstract
The invention discloses a multi-frequency solid-state microwave oven and a heating method using the same, wherein the method comprises the following steps: the central control unit determines the working frequency and/or the working frequency band in the working process of the microwave oven, sends a first indicating signal for indicating the working frequency and/or the working frequency band to the multi-frequency information source and sends a second indicating signal for gating the power amplifier unit corresponding to the working frequency and/or the working frequency band to the frequency gating switch; after receiving the first indication signal from the central control unit, the multi-frequency signal source generates a microwave signal with the frequency being the working frequency and/or the working frequency being the working frequency band, and after receiving the second indication signal from the central control unit, the frequency gating switch gates the power amplification unit indicated by the second indication signal; and the radiation unit receives the microwave signal output by the multi-frequency solid-state source and excites an electromagnetic field in the microwave oven cavity according to the microwave signal. The invention can realize the coverage of various frequency bands for microwave heating, and the optimal heating effect is achieved by flexibly selecting different frequencies.
Description
Technical Field
The invention relates to the field of microwave heating, in particular to a multi-frequency solid-state microwave oven and a heating method using the same.
Background
The microwave heating mode has replaced the traditional heating mode in many fields by the advantages of uniform heating, high quality, high efficiency, strong penetrating power and the like.
The microwave oven field is typically applied to the mode of microwave heating, and microwave oven produces the microwave electromagnetic field, eats the material through the microwave electromagnetic field to the heating, makes the hydrone of heating in eating the material polarize, and the hydrone after the polarization moves along with field direction high speed to realize the heating, compare in traditional heating mode and rely on the different principle of heat transfer alone, the microwave heating mode is more high-efficient, and adopt the mode of inside and outside simultaneous heating, have better homogeneity.
The traditional microwave oven generates a signal source through a magnetron, and the magnetron is an electric vacuum device, so that the microwave oven has the defects of unstable output power, high-voltage operation of kilovolt, large volume and weight, difficulty in integration and control and the like, and is not beneficial to intelligent integrated design.
The traditional microwave oven usually works in a narrow frequency band near 2.45GHz, heating is realized by adopting a single frequency band, the heating effect is not ideal when the traditional heating mode heats food materials with large size and large loss, and the working efficiency of the microwave oven is reduced.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a multi-frequency solid-state microwave oven and a heating method using the same.
The invention provides a multi-frequency solid-state microwave oven, comprising: the multi-frequency solid-state source, the radiation unit and the microwave oven cavity;
the multi-frequency solid state source comprises: the device comprises a central control unit, a multi-frequency information source for generating microwave signals with different frequencies, a frequency gating switch and N power amplification units which are connected with the frequency gating switch; wherein N is an integer greater than 1;
the central control unit is used for determining the working frequency and/or the working frequency band of the microwave oven in the working process, sending a first indicating signal for indicating the working frequency and/or the working frequency band to the multi-frequency information source and sending a second indicating signal for gating the power amplifier unit corresponding to the working frequency and/or the working frequency band to the frequency gating switch;
the multi-frequency signal source is used for generating a microwave signal with the frequency of the working frequency and/or the working frequency in the working frequency band after receiving the first indication signal from the central control unit;
the frequency gating switch is used for gating the power amplification unit indicated by the second indicating signal after receiving the second indicating signal from the central control unit;
the radiation unit is used for receiving the microwave signal output by the multi-frequency solid-state source and exciting an electromagnetic field in the microwave oven cavity according to the microwave signal.
The multi-frequency solid-state microwave oven also has the following characteristics:
the frequency gating switch comprises an input gating switch and an output gating switch;
the input end of the input gating switch is connected with the output end of the multi-frequency information source, and N output ends of the input gating switch are respectively connected with the input ends of the N power amplification units;
the N input ends of the output gating switch are respectively connected with the output ends of the N power amplification units, and the output end of the output gating switch is respectively connected with the radiation unit;
the central control unit is further configured to send an indication signal for gating the power amplifier unit corresponding to the operating frequency and/or the operating frequency band to the frequency gating switch by using the following method: and sending an indication signal for gating the same power amplifier unit to the input gating switch and the output gating switch, wherein the same power amplifier unit is a power amplifier unit corresponding to the working frequency and/or the working frequency band.
The multi-frequency solid-state microwave oven also has the following characteristics:
the central control unit is also used for obtaining the thickness of the object and determining the working frequency and/or the working frequency band of the microwave oven in the working process according to the thickness of the object.
The multi-frequency solid-state microwave oven also has the following characteristics:
the central control unit is also used for maintaining the mapping relation between the thickness interval and the working frequency; and is further configured to determine an operating frequency of the microwave oven during operation from the thickness of the object using: and determining a thickness interval to which the thickness of the object belongs, and determining the working frequency corresponding to the thickness interval according to the mapping relation.
The thickness interval and the working frequency band are mapped; and is further configured to determine an operating frequency of the microwave oven during operation from the thickness of the object using: determining a thickness interval to which the thickness of the object belongs, determining a working frequency band corresponding to the thickness interval according to the mapping relation, or determining the thickness interval to which the thickness of the object belongs, determining the working frequency band corresponding to the thickness interval according to the mapping relation, and selecting a working frequency belonging to the working frequency band from the working frequency bands.
The multi-frequency solid-state microwave oven also has the following characteristics:
the central control unit is also used for determining the working frequency of the microwave oven in the working process by using the following method: determining the set heating time of the microwave oven, dividing the set heating time into M time periods, taking a first frequency band as a working frequency band in a first time period, taking a second frequency band as a working frequency band in a second time period, and so on, taking an Mth frequency band as the working frequency band in the Mth time period, wherein M is an integer less than or equal to N, and the first frequency band to the Mth frequency band are sequentially increased;
or determining the set heating time of the microwave oven, dividing the set heating time into M time periods, taking the working frequency point in the first frequency band as a first working frequency point in the first time period, taking the working frequency point in the second frequency band as a second working frequency point in the second time period, and so on, taking the working frequency point in the Mth frequency band as a third working frequency point in the Mth time period, wherein M is an integer less than or equal to N, and the first working frequency point to the Mth working frequency point are sequentially increased.
The multi-frequency solid-state microwave oven also has the following characteristics:
the central control unit is also used for determining the working frequency of the microwave oven in the working process by using the following method: selecting at least one preferred frequency point from the same frequency band or more than one frequency band; and determining the set heating time of the microwave oven, dividing the set heating time into X time periods, and using the at least one optimized frequency point circularly in the X time periods as the working frequency of the corresponding time period.
The multi-frequency solid-state microwave oven also has the following characteristics:
the multi-frequency solid-state microwave oven also comprises N return loss detection units;
the return loss detection unit is used for carrying out in-band scanning of return loss to obtain a scanning result;
the central control unit is further configured to control the return loss detection unit to perform in-band scanning of return loss at preset scanning frequency intervals in the same frequency band or in more than one frequency band, calculate and obtain a return loss index according to a scanning result, and use a frequency point corresponding to the return loss index meeting the return loss threshold range as a selected preferred frequency point.
The invention provides a heating method using a multi-frequency solid-state microwave oven, which comprises the following steps:
the central control unit determines the working frequency and/or the working frequency band of the microwave oven in the working process, sends a first indicating signal for indicating the working frequency and/or the working frequency band to the multi-frequency information source and sends a second indicating signal for gating the power amplification unit corresponding to the working frequency and/or the working frequency band to the frequency gating switch;
after receiving the first indication signal from the central control unit, the multi-frequency signal source generates a microwave signal with the frequency of the working frequency and/or the working frequency in the working frequency band, and after receiving the second indication signal from the central control unit, the frequency gating switch gates the power amplifier unit indicated by the second indication signal;
the radiation unit receives microwave signals output by the multi-frequency solid-state source, and excites an electromagnetic field in the microwave oven cavity according to the microwave signals.
The heating method also has the following characteristics:
the central control unit is further configured to send an indication signal for gating the power amplifier unit corresponding to the operating frequency and/or the operating frequency band to the frequency gating switch by using the following method: and sending an indication signal for gating the same power amplifier unit to the input gating switch and the output gating switch, wherein the same power amplifier unit is a power amplifier unit corresponding to the working frequency and/or the working frequency band.
The heating method also has the following characteristics:
the method further comprises the following steps: the central control unit obtains the thickness of the object, and determines the working frequency and/or the working frequency band of the microwave oven in the working process according to the thickness of the object.
The heating method also has the following characteristics:
the method further comprises the following steps:
the central control unit maintains the mapping relation between the thickness interval and the working frequency; determining an operating frequency of the microwave oven during operation from the thickness of the object using: and determining a thickness interval to which the thickness of the object belongs, and determining the working frequency corresponding to the thickness interval according to the mapping relation.
Or the central control unit maintains the mapping relation between the thickness interval and the working frequency band; determining an operating frequency of the microwave oven during operation from the thickness of the object using: determining a thickness interval to which the thickness of the object belongs, determining a working frequency band corresponding to the thickness interval according to the mapping relation, or determining the thickness interval to which the thickness of the object belongs, determining the working frequency band corresponding to the thickness interval according to the mapping relation, and selecting a working frequency belonging to the working frequency band from the working frequency bands.
The heating method also has the following characteristics:
the central control unit determines the working frequency of the microwave oven in the working process by using the following method:
determining the set heating time of the microwave oven, dividing the set heating time into M time periods, taking a first frequency band as a working frequency band in a first time period, taking a second frequency band as a working frequency band in a second time period, and so on, taking an Mth frequency band as the working frequency band in the Mth time period, wherein M is an integer less than or equal to N, and the first frequency band to the Mth frequency band are sequentially increased;
or determining the set heating time of the microwave oven, dividing the set heating time into M time periods, taking the working frequency point in the first frequency band as a first working frequency point in the first time period, taking the working frequency point in the second frequency band as a second working frequency point in the second time period, and so on, taking the working frequency point in the Mth frequency band as a third working frequency point in the Mth time period, wherein M is an integer less than or equal to N, and the first working frequency point to the Mth working frequency point are sequentially increased.
The heating method also has the following characteristics:
the central control unit determines the working frequency of the microwave oven in the working process by using the following method: selecting at least one preferred frequency point from the same frequency band or more than one frequency band; and determining the set heating time of the microwave oven, dividing the set heating time into X time periods, and using the at least one optimized frequency point circularly in the X time periods as the working frequency of the corresponding time period.
The heating method also has the following characteristics:
the central control unit controls the return loss detection unit to perform in-band scanning of return loss at preset scanning frequency intervals in the same frequency band or more than one frequency band, calculates and obtains a return loss index according to a scanning result, and takes a frequency point corresponding to the return loss index meeting the return loss threshold range as a selected preferred frequency point.
The scheme of the invention can cover all frequency bands of microwave heating and can solve the problems of poor heating uniformity and the like.
Compared with the prior art, the invention has the following advantages and effects:
1. the solid-state source is used for replacing a magnetron, so that stable output power, safe system, compact structure and high-integration control are realized;
2. the coverage of various frequency bands of microwave heating can be realized through one multi-frequency solid-state source module, and the optimal heating effect is achieved through flexible selection of different frequencies;
3. the multi-frequency solid-state microwave oven can solve the problem that the heating uniformity of the same heating object is not high;
4. the multi-frequency solid-state microwave oven can solve the problem of penetration depth of different heating objects, and the heated food materials are more diversified through switching of different frequencies.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a multi-frequency solid-state microwave oven;
FIG. 2 is another schematic diagram of a multi-frequency solid-state microwave oven;
fig. 3 is a flow chart of a heating method using a multi-frequency solid-state microwave oven.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in fig. 1, the multi-frequency solid-state microwave oven includes: a multi-frequency solid state source, a radiation unit and a microwave oven cavity.
A multi-frequency solid state source comprising: the device comprises a central control unit, a multi-frequency information source for generating microwave signals with different frequencies, a frequency gating switch and N power amplification units which are connected with the frequency gating switch; wherein N is an integer greater than 1;
the central control unit is used for determining the working frequency and/or the working frequency band of the microwave oven in the working process, sending a first indicating signal for indicating the working frequency and/or the working frequency band to the multi-frequency information source and sending a second indicating signal for gating the power amplification unit corresponding to the working frequency and/or the working frequency band to the frequency gating switch;
the multi-frequency signal source is used for generating a microwave signal with the frequency of the working frequency and/or the working frequency in the working frequency band after receiving the first indication signal from the central control unit;
the frequency gating switch is used for gating the power amplification unit indicated by the second indicating signal after receiving the second indicating signal from the central control unit;
the radiation unit is used for receiving microwave signals output by the multi-frequency solid-state source, and exciting an electromagnetic field in the microwave oven cavity according to the microwave signals.
Various implementations may be supported in this scheme:
the central control unit determines a working frequency of the microwave oven in the working process, the multi-frequency signal source generates a microwave signal with the frequency of the working frequency, and the frequency gating switch gates the power amplification unit corresponding to the working frequency.
And secondly, the central control unit determines a plurality of working frequencies of the microwave oven in the working process, the multi-frequency information source sequentially generates microwave signals with the working frequencies, and the frequency gating switch sequentially gates the power amplification units corresponding to the working frequencies.
And thirdly, the central control unit determines a working frequency band of the microwave oven in the working process, the multi-frequency signal source generates a microwave signal with the frequency belonging to the working frequency band, and the frequency gating switch gates the power amplification unit corresponding to the working frequency band.
And fourthly, the central control unit determines a plurality of working frequency bands of the microwave oven in the working process, the multi-frequency signal source sequentially generates microwave signals with frequencies respectively belonging to the plurality of working frequency bands, and the frequency gating switch sequentially gates the power amplification units corresponding to the plurality of working frequency bands.
And fifthly, the central control unit determines a plurality of working frequency bands and working frequency in each working frequency band in the working process of the microwave oven, the multi-frequency signal source sequentially generates microwave signals with the frequencies of the plurality of working frequencies, and the frequency gating switch sequentially gates the power amplifier units corresponding to the plurality of working frequency bands.
The multi-frequency solid-state microwave oven further includes a power supply for supplying power. The power supply filters and converts the 220V/50Hz of the external commercial power to obtain various voltages required by the power amplification unit, such as: the voltage required by the power amplification unit comprises 28V, 6.5V and 3.3V, wherein the 28V is provided for the drain electrode of the power amplification tube of the power amplification unit to supply power, the 6.5V is provided for the operational amplifier and the low-power push-level power amplifier to supply power, and the 3.3V is provided for the power detection and temperature detection circuit.
The working principle of the multi-frequency solid-state microwave oven is as follows: the multi-frequency solid-state source generates a microwave signal, which is fed into the microwave oven cavity via the radiation unit. The radiation unit excites microwave signals into an electromagnetic field in the cavity, polar molecules (usually water molecules) in the food materials are polarized through the electromagnetic field, and the polarized molecules move back and forth rapidly along the direction of the electromagnetic field, so that the food is heated.
The multi-frequency signal source is a component generating an original signal through oscillation, parameters of the multi-frequency signal source pay attention to indexes such as output power, output frequency range, higher harmonic suppression, stray suppression and the like, the implementation modes of the multi-frequency signal source are various, and the design of an oscillating circuit can be carried out through a special signal source integrated chip or through discrete components. Multiple frequency sources for producing the coverage f1、f2、f3…fNThe microwave signals with a plurality of frequencies can cover the working frequency range in the microwave heating field, and different frequencies are applied to different heating objects or different heating occasions. The multi-frequency information source can be realized by a discrete voltage-controlled oscillator and a phase-locked loop, or can be designed by an integrated IC (integrated circuit), for example, an integrated chip HMC832 can be adopted, the chip integrates the voltage-controlled oscillator and the phase-locked loop together, can cover the frequency range of 25 MHz-3000 MHz, can easily realize the coverage of microwave heating of multiple frequency bands, and a power adjusting module is arranged in the chip, so that the power adjustment in a small range can be realized.
The power amplification unit is mainly used for completing signal conditioning and amplification and providing basic data for monitoring for the central control system. The signal conditioning and amplifying mainly comprises multistage power amplifier cascade amplification, harmonic suppression, phase adjustment and power control, and the part completes the amplification of a low-power signal of the multi-frequency information source to rated power. The data monitored by the parameter monitoring circuit mainly comprises forward power detection voltage, reverse power detection voltage and temperature sensor voltage, the three voltage data are transmitted to a central control system for data operation, and finally, accurate forward power, reverse power and module temperature can be obtained.
The first to Nth power amplifier units respectively work at the frequencies of a first frequency band, a second frequency band and an Nth frequency band of …, the N power amplifier units are internally composed of multi-stage solid power amplifiers, microwave signals generated by multi-frequency information sources are amplified step by step, and auxiliary circuits are added to control power amplifier links, such as an ATT circuit, an ALC circuit, a signal conditioning circuit, a parameter monitoring circuit and the like. Each power amplifier unit exists in the power amplifier system in an independent functional circuit form or a functional module form, so that the specific subunit can be quickly positioned if abnormality occurs, and maintenance can be performed timely.
Since the microwave heats the food by means of electric field polarized water molecules, the field intensity distribution of the electromagnetic field inside the microwave oven cavity directly determines the uniformity of the heated food. And uniform electromagnetic field distribution is formed in the microwave oven cavity through the radiation unit, so that the uniformity of the heating effect is ensured. Microwave signals generated by the multi-frequency solid-state source are fed into the microwave oven cavity through the multi-frequency radiation unit, the radiation unit serves as a bridge for connecting the source and the cavity and plays a vital role, the output of the multi-frequency solid-state source is relatively fixed, the multi-frequency solid-state source is equivalent to the fact that the multi-frequency radiation unit and the microwave oven cavity are in cascade connection, and cascade connection equivalence can be calculated through a scattering matrix. Assuming a scattering matrix of the multi-frequency radiation unit as
The scattering matrix of the microwave oven cavity is
The total scattering matrix after the two are cascaded is S]ABThen, according to the scattering matrix theory of the cascaded two-port network,
from the above formula, the multi-frequency radiation unit plays a role of impedance conversion, the impedance of the microwave oven cavity is converted by the unit, and the impedance after conversion needs to be well matched with the output of the multi-frequency solid-state source. [ S ]]ABIn (1)
In practical engineering applications less than-15 dB is required to ensure that most of the power is fed into the microwave cavity.
The frequency gating switch in the multi-frequency solid-state microwave oven includes an input gating switch and an output gating switch. The input end of the input gating switch is connected with the output end of the multi-frequency information source, and the N output ends of the input gating switch are respectively connected with the input ends of the N power amplification units. N input ends of the output gating switch are respectively connected with output ends of the N power amplification units, and output ends of the output gating switch are respectively connected with the radiation unit.
The central control unit is also used for sending an indication signal of the power amplifier unit corresponding to the gating working frequency to the frequency gating switch by using the following method: and sending an indication signal for gating the same power amplification unit to the input gating switch and the output gating switch, wherein the same power amplification unit is a power amplification unit corresponding to the working frequency and/or the working frequency band. Namely, the logics of the input gating switch and the output gating switch are sequentially corresponding, the input gating switch is in a 01 channel, the output gating switch is also required to be selected in the 01 channel, the input gating switch corresponds to the power amplification unit of the first frequency band, and at the moment, the multi-frequency solid-state source works at the frequency of the first frequency band.
Besides determining the working frequency and controlling the input gating switch and the output gating switch to select and switch the power amplifier unit, the central control unit also needs to perform multi-frequency solid-state source output power level control, multi-frequency solid-state source output microwave signal phase adjustment, extraction of various parameters (including module temperature monitoring, forward power extraction and reverse power extraction), and establishment of an alarm mechanism (including over-temperature alarm, forward power alarm, reverse power alarm, load standing wave ratio alarm and the like).
From the theory of microwave technology, it can be known that different frequencies penetrate food materials at different depths, and the penetration depth is generally used to represent the attenuation capability of the food material to microwave energy, and the penetration depth (D) is defined as the distance from the surface of the food material to 1/e of the surface value of the microwave power. The penetration depth can be used
Is calculated, where λ0In terms of wavelength in a vacuum,. epsilon.' is the relative dielectric constant of the medium, and. delta. is the loss tangent of the medium. According to the penetration depth calculation formula, the longer the wavelength of the incident microwave is, the smaller the relative dielectric constant of the medium is, the smaller the loss is, and the deeper the penetration depth is. Table 1 below lists the penetration depths in pork for several frequencies that are common.
TABLE 1 penetration depth of different frequency microwaves in pork
As is apparent from table 1, the penetration depths of the same heated food material are different when heated by microwave signals of different frequencies, and the penetration depths are deeper as the wavelength is longer, which is consistent with the theoretical analysis results. Similarly, under the same frequency, different heating food materials have different penetration depths, and the water content in the heating food material also influences the penetration depth, so that the analysis shows that microwave signals with different frequencies are selected for different food materials or microwave signals with different frequencies are adopted for heating at different heating moments of the same food material by means of efficient and uniform heating, and the optimal heating effect is achieved.
The operation of the multi-frequency solid-state microwave oven will be described in the following with reference to various embodiments.
Implementation mode one
The central control unit is also used for obtaining the thickness of the object and determining the working frequency and/or the working frequency band of the microwave oven in the working process according to the thickness of the object detected by the thickness of the object.
For example: the central control unit maintains the mapping relation between the thickness interval and the working frequency; the mapping relation between the thickness interval and the working frequency is as follows:
0 to 2 cm, 2450MHz
2 to 3.5 cm, 915MHz
Greater than 3.5 cm at 433MHz
And determining a thickness interval to which the thickness of the object belongs, and determining the working frequency corresponding to the thickness interval according to the mapping relation.
For another example: the central control unit maintains the mapping relation between the thickness interval and the working frequency band; the mapping relation between the thickness interval and the working frequency band is as follows:
0 to 2 cm, 2450 and 1000MHz to 2450+1000MHz
2 to 3.5 cm, 915-300MHz to 915+300MHz
Greater than 3.5 cm, 433-433 +100MHz
And determining a thickness interval to which the thickness of the object belongs, and determining a working frequency band corresponding to the thickness interval according to the mapping relation.
Or determining a thickness interval to which the thickness of the object belongs, determining a working frequency band corresponding to the thickness interval according to the mapping relation, and selecting a frequency belonging to the working frequency band.
Second embodiment
The central control unit determines the set heating time of the microwave oven, divides the set heating time into M periods, takes a first frequency band as a working frequency band in the first period, takes a second frequency band as the working frequency band in the second period, and so on, takes the Mth frequency band as the working frequency band in the Mth period, M is an integer less than or equal to N, and the first frequency band to the Mth frequency band are sequentially increased.
Third embodiment
The method comprises the steps that a central control unit determines the set heating time of the microwave oven, the set heating time is divided into M time intervals, the working frequency point in a first frequency band is used as a first working frequency point in the first time interval, the working frequency point in a second frequency band is used as a second working frequency point in the second time interval, and the like, the working frequency point in the M frequency band is used as a third working frequency point in the M time interval, M is an integer smaller than or equal to N, and the first working frequency point and the M working frequency point are sequentially increased.
Embodiment IV
The central control unit selects at least one preferred frequency point from the same frequency band or more than one frequency band; and determining the set heating time of the microwave oven, dividing the set heating time into X time periods, and using the at least one optimized frequency point circularly in the X time periods as the working frequency of the corresponding time period.
As shown in fig. 2, the multi-frequency solid-state microwave oven further includes N return loss detection units;
the return loss detection unit is used for carrying out in-band scanning of return loss to obtain a scanning result;
the central control unit is also used for controlling the return loss detection unit to perform in-band scanning of return loss at preset scanning frequency intervals in the same frequency band or more than one frequency band, calculating and obtaining a return loss index according to a scanning result, and taking a frequency point corresponding to the return loss index meeting the return loss threshold range as a selected preferred frequency point. For example, the return loss threshold range is less than 1 watt.
As shown in fig. 3, the heating method using the multi-frequency solid-state microwave oven includes:
step 301, a central control unit determines the working frequency and/or the working frequency band of a microwave oven in the working process, sends a first indication signal for indicating the working frequency and/or the working frequency band to a multi-frequency signal source, and sends a second indication signal for gating the power amplification unit corresponding to the working frequency and/or the working frequency band to a frequency gating switch;
step 302, after receiving the first indication signal from the central control unit, the multi-frequency signal source generates a microwave signal with a frequency of a working frequency and/or a working frequency located in a working frequency band, and after receiving the second indication signal from the central control unit, the frequency gating switch gates the power amplifier unit indicated by the second indication signal;
Wherein the content of the first and second substances,
the central control unit sends an indication signal of a power amplification unit corresponding to the gating working frequency and/or the working frequency band to the frequency gating switch by using the following method: and sending an indication signal for gating the same power amplification unit to the input gating switch and the output gating switch, wherein the same power amplification unit is a power amplification unit corresponding to the working frequency and/or the working frequency band.
The different modes of operation of the heating method are explained below by means of different embodiments.
Implementation mode one
The central control unit obtains the thickness of the object, and determines the working frequency and/or the working frequency band of the microwave oven in the working process according to the thickness of the object detected by the thickness of the object.
For example: the central control unit maintains the mapping relation between the thickness interval and the working frequency; the mapping relation between the thickness interval and the working frequency is as follows:
0 to 2 cm, 2450MHz
2 to 3.5 cm, 915MHz
Greater than 3.5 cm at 433MHz
And determining a thickness interval to which the thickness of the object belongs, and determining the working frequency corresponding to the thickness interval according to the mapping relation.
For another example: the central control unit maintains the mapping relation between the thickness interval and the working frequency band; the mapping relation between the thickness interval and the working frequency band is as follows:
0 to 2 cm, 2450 and 1000MHz to 2450+1000MHz
2 to 3.5 cm, 915-300MHz to 915+300MHz
Greater than 3.5 cm, 433-433 +100MHz
And determining a thickness interval to which the thickness of the object belongs, and determining a working frequency band corresponding to the thickness interval according to the mapping relation.
Or determining a thickness interval to which the thickness of the object belongs, determining a working frequency band corresponding to the thickness interval according to the mapping relation, and selecting a frequency belonging to the working frequency band.
Second embodiment
The central control unit determines the set heating time of the microwave oven, divides the set heating time into M periods, takes a first frequency band as a working frequency band in the first period, takes a second frequency band as the working frequency band in the second period, and so on, takes the Mth frequency band as the working frequency band in the Mth period, M is an integer less than or equal to N, and the first frequency band to the Mth frequency band are sequentially increased.
Third embodiment
The method comprises the steps that a central control unit determines the set heating time of the microwave oven, the set heating time is divided into M time intervals, the working frequency point in a first frequency band is used as a first working frequency point in the first time interval, the working frequency point in a second frequency band is used as a second working frequency point in the second time interval, and the like, the working frequency point in the M frequency band is used as a third working frequency point in the M time interval, M is an integer smaller than or equal to N, and the first working frequency point and the M working frequency point are sequentially increased.
Embodiment IV
The central control unit selects at least one preferred frequency point from the same frequency band or more than one frequency band; and determining the set heating time of the microwave oven, dividing the set heating time into X time periods, and using the at least one optimized frequency point circularly in the X time periods as the working frequency of the corresponding time period.
The scheme of the invention can cover all frequency bands of microwave heating and can solve the problem of poor heating uniformity.
Compared with the prior art, the invention has the following advantages and effects:
1. the solid-state source is used for replacing a magnetron, so that stable output power, safe system, compact structure and high-integration control are realized;
2. the coverage of various frequency bands of microwave heating can be realized through one multi-frequency solid-state source module, and the optimal heating effect is achieved through flexible selection of different frequencies;
3. the multi-frequency solid-state microwave oven can solve the problem that the heating uniformity of the same heating object is not high;
4. the multi-frequency solid-state microwave oven can solve the problem of penetration depth of different heating objects, and the heated food materials are more diversified through switching of different frequencies.
The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the foregoing embodiments may also be implemented by using one or more integrated circuits, and accordingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
It is to be noted that, in this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that an article or apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The above embodiments are merely to illustrate the technical solutions of the present invention and not to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it should be understood that the present invention is to be covered by the appended claims.
Claims (10)
1. A multi-frequency solid-state microwave oven, comprising: the multi-frequency solid-state source, the radiation unit and the microwave oven cavity;
the multi-frequency solid state source comprises: the device comprises a central control unit, a multi-frequency information source for generating microwave signals with different frequencies, a frequency gating switch and N power amplification units which are connected with the frequency gating switch; wherein N is an integer greater than 1;
the central control unit is used for determining the working frequency and/or the working frequency band of the microwave oven in the working process, sending a first indicating signal for indicating the working frequency and/or the working frequency band to the multi-frequency information source and sending a second indicating signal for gating the power amplifier unit corresponding to the working frequency and/or the working frequency band to the frequency gating switch;
the multi-frequency signal source is used for generating a microwave signal with the frequency of the working frequency and/or the working frequency in the working frequency band after receiving the first indication signal from the central control unit;
the frequency gating switch is used for gating the power amplification unit indicated by the second indicating signal after receiving the second indicating signal from the central control unit;
the radiation unit is used for receiving the microwave signal output by the multi-frequency solid-state source and exciting an electromagnetic field in the microwave oven cavity according to the microwave signal.
2. The multi-frequency solid state microwave oven of claim 1,
the frequency gating switch comprises an input gating switch and an output gating switch;
the input end of the input gating switch is connected with the output end of the multi-frequency information source, and N output ends of the input gating switch are respectively connected with the input ends of the N power amplification units;
the N input ends of the output gating switch are respectively connected with the output ends of the N power amplification units, and the output end of the output gating switch is respectively connected with the radiation unit;
the central control unit is further configured to send an indication signal for gating the power amplifier unit corresponding to the operating frequency and/or the operating frequency band to the frequency gating switch by using the following method: and sending an indication signal for gating the same power amplifier unit to the input gating switch and the output gating switch, wherein the same power amplifier unit is a power amplifier unit corresponding to the working frequency and/or the working frequency band.
3. The multi-frequency solid-state microwave oven according to claim 1, wherein said central control unit is further configured to obtain an object thickness, and determine an operating frequency and/or an operating frequency band of said microwave oven during operation based on said object thickness.
4. The multi-frequency solid-state microwave oven of claim 3, wherein said central control unit is further configured to maintain a mapping of thickness intervals to operating frequencies; and is further configured to determine an operating frequency of the microwave oven during operation from the thickness of the object using: determining a thickness interval to which the thickness of the object belongs, and determining working frequency corresponding to the thickness interval according to the mapping relation;
the thickness interval and the working frequency band are mapped; and is further configured to determine an operating frequency of the microwave oven during operation from the thickness of the object using: determining a thickness interval to which the thickness of the object belongs, determining a working frequency band corresponding to the thickness interval according to the mapping relation, or determining the thickness interval to which the thickness of the object belongs, determining the working frequency band corresponding to the thickness interval according to the mapping relation, and selecting a working frequency belonging to the working frequency band from the working frequency bands.
5. The multi-frequency solid-state microwave oven of claim 1, wherein said central control unit is further configured to determine an operating frequency of said microwave oven during operation using: determining the set heating time of the microwave oven, dividing the set heating time into M time periods, taking a first frequency band as a working frequency band in a first time period, taking a second frequency band as a working frequency band in a second time period, and so on, taking an Mth frequency band as the working frequency band in the Mth time period, wherein M is an integer less than or equal to N, and the first frequency band to the Mth frequency band are sequentially increased;
or determining the set heating time of the microwave oven, dividing the set heating time into M time periods, taking the working frequency point in the first frequency band as a first working frequency point in the first time period, taking the working frequency point in the second frequency band as a second working frequency point in the second time period, and so on, taking the working frequency point in the Mth frequency band as a third working frequency point in the Mth time period, wherein M is an integer less than or equal to N, and the first working frequency point to the Mth working frequency point are sequentially increased.
6. The multi-frequency solid-state microwave oven of claim 1, wherein said central control unit is further configured to determine an operating frequency of said microwave oven during operation using: selecting at least one preferred frequency point from the same frequency band or more than one frequency band; and determining the set heating time of the microwave oven, dividing the set heating time into X time periods, and using the at least one optimized frequency point circularly in the X time periods as the working frequency of the corresponding time period.
7. The multi-frequency solid state microwave oven of claim 6,
the multi-frequency solid-state microwave oven also comprises N return loss detection units;
the return loss detection unit is used for carrying out in-band scanning of return loss to obtain a scanning result;
the central control unit is further configured to control the return loss detection unit to perform in-band scanning of return loss at preset scanning frequency intervals in the same frequency band or in more than one frequency band, calculate and obtain a return loss index according to a scanning result, and use a frequency point corresponding to the return loss index meeting the return loss threshold range as a selected preferred frequency point.
8. A heating method using a multi-frequency solid-state microwave oven, comprising:
the central control unit determines the working frequency and/or the working frequency band of the microwave oven in the working process, sends a first indicating signal for indicating the working frequency and/or the working frequency band to the multi-frequency information source and sends a second indicating signal for gating the power amplification unit corresponding to the working frequency and/or the working frequency band to the frequency gating switch;
after receiving the first indication signal from the central control unit, the multi-frequency signal source generates a microwave signal with the frequency of the working frequency and/or the working frequency in the working frequency band, and after receiving the second indication signal from the central control unit, the frequency gating switch gates the power amplifier unit indicated by the second indication signal;
the radiation unit receives microwave signals output by the multi-frequency solid-state source, and an electromagnetic field is excited in the microwave oven cavity according to the microwave signals.
9. The heating method according to claim 8,
the method further comprises the following steps: the central control unit obtains the thickness of the object, and determines the working frequency and/or the working frequency band of the microwave oven in the working process according to the thickness of the object.
10. The heating method according to claim 9,
the method further comprises the following steps:
the central control unit maintains the mapping relation between the thickness interval and the working frequency; determining an operating frequency of the microwave oven during operation from the thickness of the object using: determining a thickness interval to which the thickness of the object belongs, and determining working frequency corresponding to the thickness interval according to the mapping relation;
or the central control unit maintains the mapping relation between the thickness interval and the working frequency band; determining an operating frequency of the microwave oven during operation from the thickness of the object using: determining a thickness interval to which the thickness of the object belongs, determining a working frequency band corresponding to the thickness interval according to the mapping relation, or determining the thickness interval to which the thickness of the object belongs, determining the working frequency band corresponding to the thickness interval according to the mapping relation, and selecting a working frequency belonging to the working frequency band from the working frequency bands.
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| CN112584566B (en) * | 2019-09-29 | 2023-09-19 | 青岛海尔智能技术研发有限公司 | Radio frequency heating control method and radio frequency heating appliance |
| CN111023176B (en) * | 2019-12-31 | 2022-12-09 | 广东美的厨房电器制造有限公司 | Microwave cooking equipment and control device thereof |
| CN111065178A (en) * | 2020-01-17 | 2020-04-24 | 湖南三重理想储能科技有限公司 | Microwave heating device for energy storage medium and adsorption medium |
| CN113739220B (en) * | 2020-05-29 | 2023-01-31 | 广东美的厨房电器制造有限公司 | Control method, microwave device and storage medium |
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