CN105423363B - Microwave source system, micro-wave oven and the method performed in microwave source system - Google Patents
Microwave source system, micro-wave oven and the method performed in microwave source system Download PDFInfo
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- CN105423363B CN105423363B CN201610014044.9A CN201610014044A CN105423363B CN 105423363 B CN105423363 B CN 105423363B CN 201610014044 A CN201610014044 A CN 201610014044A CN 105423363 B CN105423363 B CN 105423363B
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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
-
- 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
- H05B2214/00—Aspects relating to resistive heating, induction heating and heating using microwaves, covered by groups H05B3/00, H05B6/00
Abstract
The present invention relates to microwave technical field, discloses a kind of microwave source system, micro-wave oven and the method performed in microwave source system.The system includes frequency synthesis unit, power amplification unit and control unit, wherein：The frequency synthesis unit is used to produce radiofrequency signal；The power amplification unit is connected with the frequency synthesis unit, for performing amplifieroperation to the radiofrequency signal；Described control unit is connected with the frequency synthesis unit and the power amplification unit, for controlling the frequency synthesis unit to produce multiple different radiofrequency signals, based on the power amplification unit from the multiple different radiofrequency signal corresponding to power output and reflection power determine the optimum frequency and phase of radiofrequency signal, and control the frequency synthesis unit to produce the radiofrequency signal with the optimum frequency and phase.Thus, it is possible to the accurate control to microwave oven output power is realized, so as to improve heating effect.
Description
Technical field
The present invention relates to microwave technical field, in particular it relates to a kind of microwave source system, micro-wave oven and in microwave source system
The method of middle execution.
Background technology
The core component solid state microwave sources of Solid Source micro-wave oven (SSMWO), its more deep, generally use of research
Voltage controlled oscillator (VCO) is used as microwave generator, and by promoting, promoting in advance, final stage etc. be amplified step by step, eventually through day
Line is by guided wave transformed space free wave, in feed-in microwave oven heating cavity body.
Solid Source microwave source system is mostly using the frequency and power that respective VCO is controlled using analog control voltage at present
(also having by controlling DC voltage to control power), finally by antenna by microwave energy feed-in microwave heating chamber.By
Semiconductor devices is formed on, existing solid state microwave stove power output is smaller, power, frequency and phase adjustment low precision, and temperature
Stability is poor, and heating uniformity and effect are not ideal enough, and application extension is poor.
The content of the invention
It is an object of the invention to provide a kind of microwave source system, micro-wave oven and the method performed in microwave source system, with
Solve above-mentioned the problems of the prior art.
To achieve these goals, the present invention provides a kind of microwave source system, and the system includes frequency synthesis unit, power
Amplifying unit and control unit, wherein：The frequency synthesis unit is used to produce radiofrequency signal；The power amplification unit and institute
The connection of frequency synthesis unit is stated, for performing amplifieroperation to the radiofrequency signal；Described control unit and the frequency synthesis
Unit connects with the power amplification unit, for controlling the frequency synthesis unit to produce multiple different radiofrequency signals, base
In the power amplification unit radio frequency is determined from power output and reflection power corresponding to the multiple different radiofrequency signal
The optimum frequency and optimum phase of signal, and control the frequency synthesis unit to produce with the optimum frequency and described optimal
The radiofrequency signal of phase.
Present invention also offers a kind of micro-wave oven, the micro-wave oven includes above-mentioned microwave source system.
Present invention also offers the method implemented in microwave source system, wherein, it is comprehensive that the microwave source system includes frequency
Closing unit, power amplification unit and control unit, this method includes：The frequency synthesis unit is controlled using described control unit
Produce multiple different radiofrequency signals, based on the power amplification unit from the multiple different radiofrequency signal corresponding to it is defeated
Go out power and reflection power determines the optimum frequency and optimum phase of radiofrequency signal, wherein the multiple different radiofrequency signal quilt
The power amplification unit amplification；And the frequency synthesis unit is controlled to produce with described optimal using described control unit
The radiofrequency signal of frequency and the optimum phase.
Pass through above-mentioned technical proposal, the frequency synthesis unit is controlled to produce using the control unit of microwave source system multiple
Different radiofrequency signals, based on the power amplification unit from the multiple different radiofrequency signal corresponding to power output and
Reflection power determines the optimum frequency and phase of radiofrequency signal, and controls the frequency synthesis unit to produce with the optimal frequency
The radiofrequency signal of rate and phase.Thus, due to being the radiofrequency signal with optimum frequency and phase caused by frequency synthesis unit,
So the radiofrequency signal can obtain optimal power output after power amplification unit amplifies, it is possible to achieve micro-wave oven is exported
The accurate control of power, so as to improve heating effect.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the block diagram according to the microwave source system of one embodiment of the present invention；
Fig. 2 is the block diagram according to the microwave source system of another embodiment of the present invention；
Fig. 3 is the block diagram according to the microwave source system of another embodiment of the present invention；
Fig. 4 is the block diagram according to the microwave source system of another embodiment of the present invention；And
Fig. 5 is the flow chart according to the method implemented in microwave source system of one embodiment of the present invention.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Fig. 1 is the block diagram according to the microwave source system of one embodiment of the present invention.
As shown in figure 1, according to the microwave source system of one embodiment of the present invention include frequency synthesis unit (FSU) 10,
Power amplification unit (PA) 20 and control unit (MCU) 30, wherein：The frequency synthesis unit 10 is used to produce radiofrequency signal；
The power amplification unit 20 is connected with the frequency synthesis unit 10, for performing amplifieroperation to the radiofrequency signal；Institute
State control unit 30 to be connected with the frequency synthesis unit 10 and the power amplification unit 20, for controlling the frequency synthesis
Unit 10 produces multiple different radiofrequency signals, based on the power amplification unit 20 and the multiple different radiofrequency signal
Corresponding power output and reflection power determine the optimum frequency and phase of radiofrequency signal, and control the frequency synthesis unit 10
Produce the radiofrequency signal with the optimum frequency and phase.
The frequency synthesis unit is controlled to produce multiple different radiofrequency signals, base using the control unit of microwave source system
In the power amplification unit radio frequency is determined from power output and reflection power corresponding to the multiple different radiofrequency signal
The optimum frequency and phase of signal, and control the frequency synthesis unit to produce the radio frequency letter with the optimum frequency and phase
Number.Thus, due to being the radiofrequency signal with optimum frequency and phase caused by frequency synthesis unit, so the radiofrequency signal passes through
Optimal power output can be obtained after power amplification unit amplification, it is possible to achieve the accurate control to microwave oven output power,
So as to improve heating effect.
Wherein, it is each when control unit 30 controls the frequency synthesis unit 10 to produce multiple different radiofrequency signals
Individual radiofrequency signal can all export the power output corresponding with the radiofrequency signal and reflection work(after the amplification of power amplification unit 20
Rate.
According to one embodiment of the present invention, the system also includes antenna and Wave guide unit (ANT) 40, put with the power
Big unit 20 connects, and is fed to for the radiofrequency signal after amplification to be converted into electromagnetic wave in microwave oven cavity.
Thus, control the frequency synthesis unit 10 produce the radiofrequency signal with the optimum frequency and phase it
Afterwards, the caused radiofrequency signal with optimum frequency and phase will be after power amplification unit 20 amplifies by antenna and waveguide
Unit (ANT) 40 is fed in microwave oven cavity.
According to one embodiment of the present invention, described control unit 30 control the frequency synthesis unit 10 produce it is multiple not
With radiofrequency signal, based on the power amplification unit 20 and power output corresponding to the multiple different radiofrequency signal and
Reflection power determines that the optimum frequency of radiofrequency signal and phase include：
Control the frequency synthesis unit 10 produce that multiple phases are identical and radiofrequency signal that frequency is different；
Corresponding to the radiofrequency signal that frequency is different based on the identical from the multiple phase of the power amplification unit 20
Power output and reflection power calculate multiple first standing wave values of microwave oven cavity；
Using the frequency of radiofrequency signal corresponding to minimum standing wave value in the multiple first standing wave value as optimum frequency；
The frequency synthesis unit 10 is controlled to produce multiple different radiofrequency signals of phase with optimum frequency；
Based on the power amplification unit 20 from the multiple different radiofrequency signal pair of phase with optimum frequency
The power output and reflection power answered calculate multiple second standing wave values of microwave oven cavity；
Using the phase of radiofrequency signal corresponding to minimum standing wave value in the multiple second standing wave value as optimum phase.
Wherein, for the calculating of the first standing wave value and the second standing wave value, existing mode in the prior art can be used, this
Invention repeats no more.
Alternatively, it is determined that after optimum frequency, the function of determining optimum phase can not be performed.Now, different from true
Determine the frequency synthesis unit 10 after optimum frequency and optimum phase and produce penetrating with the optimum frequency and phase all the time
Frequency signal (stable in optimum frequency and phase), can control the frequency synthesis unit 10 to produce with optimum frequency and phase
Variable radiofrequency signal.It is, now microwave source system is operated in optimal frequency, but phase is constantly in dynamic adjustment shape
State.
Thus, due to being worked in the case where dynamic phasing changes, the focus of micro-wave oven can change with phase place change, so as to
Micro-wave oven heating uniformity can be significantly improved.
In addition, control unit 30 can be also used for adjusting frequency synthesis unit according to the power output of power amplification unit 20
10 output amplitude, so that the power output of power amplification unit 20 is in predetermined power grade.
According to one embodiment of the present invention, the frequency synthesis unit 10, the power amplification unit 20 and the day
Line and Wave guide unit 40 are multiple and quantity is identical, or the frequency synthesis unit 10 is one and the power amplification list
Member 20 is multiple with the antenna and Wave guide unit 40 and quantity is identical, or the frequency synthesis unit 10 to be multiple institute
It is respectively one to state power amplification unit 20 and the antenna and Wave guide unit 40.
Fig. 2 is the block diagram according to the microwave source system of another embodiment of the present invention.
In fig. 2, the frequency synthesis unit 10, the power amplification unit 20 and the antenna and Wave guide unit 40 are equal
For four.One described 10, power amplification unit 20 of frequency synthesis unit and the antenna and Wave guide unit
40 form a microwave source channels, it is possible thereby to realize multichannel (4 passage) microwave source.
Fig. 3 is the block diagram according to the microwave source system of another embodiment of the present invention.
In figure 3, the frequency synthesis unit 10 is one and the power amplification unit 20 and the antenna and waveguide
Unit 40 is four, thus can equally realize multichannel (4 passage) microwave source.
Fig. 4 is the block diagram according to the microwave source system of another embodiment of the present invention.
In Fig. 4, the frequency synthesis unit 10 is four and the power amplification unit 20 and the antenna and waveguide
Unit 40 is respectively one, thus can equally realize multichannel (4 passage) microwave source.
Although showing certain amount of component Configuration situation in Fig. 2-4, what it was merely exemplary, it is not intended to limit
The fixed present invention.
By setting multiple microwave source channels in microwave source system, can accurately carrying out subregion heating, (that is, control is single
There are multi-channel control process, the region of the multiple passage heating respective amounts of independent control in member 30).Also, compared to semiconductor work(
The peak power output for putting pipe is limited, and the power output that microwave source system can be increased by setting multiple microwave source channels (increases
The power output of complete machine).Wherein, the multiple microwave source channels all can work simultaneously, can also enter which part work,
Whether all specific work can be set according to actual conditions.
According to one embodiment of the present invention, in the frequency synthesis unit 10, the power amplification unit 20 and described
Antenna and Wave guide unit 40 be multiple and quantity identical in the case of, each include a frequency synthesis unit 10, one
The passage of the individual power amplification unit 20 and the antenna and Wave guide unit 40 works in a synchronous mode or asynchronous mode
Work.
In case of 4 passages, asynchronous mode is that 4 passages work independently, and the process that controls of control unit 30 is 4
It is individual, control 4 paths respectively, it is orthogonal between 4 paths in addition to sharing power supply.Synchronous working pattern is by measuring
After the optimum frequency frequency and phase (value) of each passage, four results are weighted averagely, determine weighted average frequency and phase
Position, then 4 passages are controlled to be operated in weighted average frequency and phase together.
According to one embodiment of the present invention, the system also includes power subsystem (not shown), for for the control
Unit 30, the frequency synthesis unit 10, the power amplification unit 20 and the antenna and Wave guide unit 40 processed are powered.That is,
Dc source required for microwave source system is provided.
According to one embodiment of the present invention, control unit 30 can be single-chip microcomputer or microprocessor, such as model
LPC433 chip.Except the function described in above-mentioned embodiment, control unit 30 can also externally with complete machine main control unit
Docking communication, the control command of main control unit is received and performed, report the working condition of microwave source system.
According to one embodiment of the present invention, frequency synthesis unit 10 can include frequency synthesis chip (for example, with pair
The frequency synthesis chip Volcano of number attenuator) and with reference to crystal oscillator.Radiofrequency signal used in microwave source can be produced by rising, this
The frequency of individual radiofrequency signal, phase, amplitude etc. are all that can be controlled by control unit 30.Its radio frequency interface and power amplification
Unit 20 is connected, and its data-interface is connected with control unit 30, can use SPI communication mode.Ground, frequency synthesis can be changed
Unit 10 can also include VCO circuits, phase modulation circuit and modulation circuit.
According to one embodiment of the present invention, the radio frequency link of power amplification unit 20 can be by promoting power tube, pushing away in advance
Dynamic power tube, final stage power amplifier pipe, isolation (annular) device are formed, peripheral auxiliary circuits can including digital temperature sensor circuit,
Current detection circuit, ouput power detection circuit, reflection power detection circuit, power discharging switch circuit, grid voltage control circuit and
Directional coupler forms.
According to one embodiment of the present invention, antenna and Wave guide unit 40 are by large-power directional antenna and feed-in waveguide structure
Into for guided wave (radio frequency) to be converted into space free wave (electromagnetic wave).
It will be appreciated by those skilled in the art that what above-mentioned example was merely exemplary, it is not intended to limit the present invention.
One embodiment of the present invention additionally provides a kind of micro-wave oven, and the micro-wave oven is included described in above-mentioned embodiment
Microwave source system.
By using above-mentioned microwave source system in micro-wave oven, because the microwave source system can automatically determine optimal frequency
Rate and phase so that standing wave preferably (reflection power is minimum), so under equal-wattage grade, including above-mentioned microwave source system
The heating effect of micro-wave oven be substantially better than common magnetron or solid state microwave sources.
Fig. 5 is the flow chart according to the method implemented in microwave source system of one embodiment of the present invention.Wherein, institute
Stating microwave source system includes frequency synthesis unit, power amplification unit and control unit.
As shown in figure 5, the method implemented in microwave source system that one embodiment of the present invention provides includes：
S500, control the frequency synthesis unit to produce multiple different radiofrequency signals using described control unit, be based on
The power amplification unit from the multiple different radiofrequency signal corresponding to power output and reflection power determine that radio frequency is believed
Number optimum frequency and phase, wherein the multiple different radiofrequency signal is amplified by the power amplification unit；And
S502, the frequency synthesis unit is controlled to produce with the optimum frequency and phase using described control unit
Radiofrequency signal.
The frequency synthesis unit is controlled to produce multiple different radiofrequency signals, base using the control unit of microwave source system
In the power amplification unit radio frequency is determined from power output and reflection power corresponding to the multiple different radiofrequency signal
The optimum frequency and phase of signal, and control the frequency synthesis unit to produce the radio frequency letter with the optimum frequency and phase
Number.Thus, due to being the radiofrequency signal with optimum frequency and phase caused by frequency synthesis unit, so the radiofrequency signal passes through
Optimal power output can be obtained after power amplification unit amplification, it is possible to achieve the accurate control to microwave oven output power,
So as to improve heating effect.
Thus, after controlling the frequency synthesis unit to produce the radiofrequency signal with the optimum frequency and phase,
The caused radiofrequency signal with optimum frequency and phase will be after power amplification unit amplifies by antenna and Wave guide unit
(ANT) it is fed in microwave oven cavity.
In the method, S500 includes：
S5000, the frequency synthesis unit is controlled to produce that multiple phases are identical and radiofrequency signal that frequency is different；
S5002, identical from the multiple phase based on the power amplification unit and radiofrequency signal pair that frequency is different
The power output and reflection power answered calculate multiple first standing wave values of microwave oven cavity；
S5004, using the frequency of radiofrequency signal corresponding to minimum standing wave value in the multiple first standing wave value as optimal frequency
Rate；
S5006, the frequency synthesis unit is controlled to produce multiple different radiofrequency signals of phase with optimum frequency；
S5008, based on the power amplification unit from it is the multiple with optimum frequency and the different radio frequency of phase is believed
Power output corresponding to number and reflection power calculate multiple second standing wave values of microwave oven cavity；
S5010, using the phase of radiofrequency signal corresponding to minimum standing wave value in the multiple second standing wave value as optimal phase
Position.
Alternatively, it is determined that after optimum frequency, the operation for determining optimum phase can not be performed.Now, different from true
Determine to control after optimum frequency and optimum phase the frequency synthesis unit to produce all the time with the optimum frequency and phase
Radiofrequency signal (stable in optimum frequency and phase), can control the frequency synthesis unit to produce with optimum frequency and phase
Variable radiofrequency signal.It is, now microwave source system is operated in optimal frequency, but phase is constantly in dynamic adjustment shape
State.
Thus, due to being worked in the case where dynamic phasing changes, the focus of micro-wave oven can change with phase place change, so as to
Micro-wave oven heating uniformity can be significantly improved.
In addition, this method also includes：The output width of frequency synthesis unit is adjusted according to the power output of power amplification unit
Degree, so that the power output of power amplification unit is in predetermined power grade.
According to one embodiment of the present invention, the frequency synthesis unit is controlled to produce multiple phases with preset frequency interval
Identical and radiofrequency signal that frequency is different；The frequency synthesis unit is controlled to be produced with predetermined phase interval multiple with optimal frequency
Rate and the different radiofrequency signal of phase.
Wherein, preset frequency interval can be 1MHz, and predetermined phase interval can be 5 °.The frequency synthesis unit
What power control mode used can be logarithmic attenuator, so that the power output control is more accurate.
Below with preset frequency at intervals of 1MHz, and predetermined phase is at intervals of microwave source system above-mentioned to the present invention exemplified by 5 °
System is described.
After microwave source system Intrusion Detection based on host (master control) order in the above-mentioned embodiment of the present invention is opened, the meeting of control unit 30
Initialize installation is carried out to frequency synthesis unit 10, is thus penetrating for original frequency and initial phase caused by frequency synthesis unit
Frequency signal.
When that need not adjust power output, this radiofrequency signal finally may be used by being amplified after power amplification unit
To be transmitted into by antenna and Wave guide unit in microwave cavity body.Wherein, power amplification unit can output it power, reflection
The information such as power are output to control unit, and control unit adjusts the output amplitude of frequency synthesizer according to the size of power output,
Power amplifier unit power output is set to be on the power grade set by main frame.Cavity is calculated according to power output and reflection power
Standing wave value.
When needing adjustment power output microwave source system is operated in optimum state, control unit 30 controls frequency synthesis
Unit 10 carries out frequency scanning that stepping is 1MHz and (that is, produces that multiple phases are identical and radiofrequency signal that frequency is different, this phase
Position can be still initial phase), while power amplification unit 20 can produce corresponding power output and reflection power, same to time control
Unit 30 processed can calculate corresponding standing wave value.When scanned in predetermined frequency band (working band) after, control unit 30 can be with
Obtain frequency corresponding to minimum standing wave value, the frequency in predetermined frequency band and be confirmed as optimum frequency.Then control unit 30 is controlled again
Frequency synthesis unit 10 processed carried out in optimum frequency stepping be 5 ° phasescan (that is, produce it is multiple have optimum frequency and
The different radiofrequency signal of phase), while power amplification unit 20 can produce corresponding power output and reflection power, control simultaneously
Unit 30 can calculate corresponding standing wave value.After scanning through 360 °, control unit 30 can obtain the minimum in 360 ° of phases
Phase corresponding to standing wave value, the phase are confirmed as optimum phase.Thus, optimum frequency and phase are all determined that solid-state is micro-
Wave source system, which will be rested under optimum frequency and phase, works that (described control unit 30 controls the frequency synthesis unit 10 to produce
The raw radiofrequency signal with the optimum frequency and phase).
In addition, control unit 30 can also control frequency synthesis unit 10 to be scanned phase action, solid state microwave always
Source system will be operated in optimum frequency but phase is constantly in dynamic adjustment state.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, still, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, a variety of letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (10)
1. a kind of microwave source system, the system includes frequency synthesis unit, power amplification unit and control unit, wherein：
The frequency synthesis unit is used to produce radiofrequency signal；
The power amplification unit is connected with the frequency synthesis unit, for performing amplifieroperation to the radiofrequency signal；
Described control unit is connected with the frequency synthesis unit and the power amplification unit, for controlling the frequency synthesis
Unit produces multiple different radiofrequency signals, corresponding from the multiple different radiofrequency signal based on the power amplification unit
Power output and reflection power determine the optimum frequency and optimum phase of radiofrequency signal, and control the frequency synthesis unit to produce
The raw radiofrequency signal with the optimum frequency and the optimum phase.
2. system according to claim 1, wherein, the system also includes antenna and Wave guide unit, with the power amplification
Unit connects, and is fed to for the radiofrequency signal after amplification to be converted into electromagnetic wave in microwave oven cavity.
3. system according to claim 2, wherein, described control unit controls the frequency synthesis unit generation multiple not
With radiofrequency signal, based on the power amplification unit from the multiple different radiofrequency signal corresponding to power output and instead
Penetrate power and determine that the optimum frequency of radiofrequency signal and optimum phase include：
The frequency synthesis unit is controlled to produce that multiple phases are identical and radiofrequency signal that frequency is different；
Output work corresponding to identical from the multiple phase based on the power amplification unit and radiofrequency signal that frequency is different
Rate and reflection power calculate multiple first standing wave values of microwave oven cavity；
Using the frequency of radiofrequency signal corresponding to minimum standing wave value in the multiple first standing wave value as optimum frequency；
The frequency synthesis unit is controlled to produce multiple different radiofrequency signals of phase with optimum frequency；
Based on the power amplification unit from it is the multiple with optimum frequency and corresponding to the different radiofrequency signal of phase it is defeated
Go out power and reflection power calculates multiple second standing wave values of microwave oven cavity；
Using the phase of radiofrequency signal corresponding to minimum standing wave value in the multiple second standing wave value as optimum phase.
4. the system according to Claims 2 or 3, wherein, the frequency synthesis unit, the power amplification unit and described
Antenna and Wave guide unit are multiple and quantity is identical, or the frequency synthesis unit is one and the power amplification unit
With the antenna and Wave guide unit be multiple and quantity is identical, or the frequency synthesis unit is that the power are put
Big unit and the antenna and Wave guide unit are respectively one.
5. system according to claim 4, wherein, in the frequency synthesis unit, the power amplification unit and described
Antenna and Wave guide unit be multiple and quantity identical in the case of, each include a frequency synthesis unit, an institute
The passage for stating power amplification unit and the antenna and Wave guide unit works or asynchronous mode work in a synchronous mode.
6. according to the system any one of claim 2-3, wherein, the system also includes power subsystem, for be described
Control unit, the frequency synthesis unit, the power amplification unit and the antenna and Wave guide unit power supply.
7. a kind of micro-wave oven, the micro-wave oven includes the microwave source system any one of the claims 1-6.
8. a kind of method implemented in microwave source system, wherein, the microwave source system includes frequency synthesis unit, power is put
Big unit and control unit, this method include：
Control the frequency synthesis unit to produce multiple different radiofrequency signals using described control unit, put based on the power
Big unit from the multiple different radiofrequency signal corresponding to power output and reflection power determine the optimal frequency of radiofrequency signal
Rate and optimum phase, wherein the multiple different radiofrequency signal is amplified by the power amplification unit；And
The frequency synthesis unit is controlled to produce with the optimum frequency and the optimum phase using described control unit
Radiofrequency signal.
9. according to the method for claim 8, wherein, the frequency synthesis unit is controlled to produce using described control unit more
Individual different radiofrequency signal, based on the power amplification unit from the multiple different radiofrequency signal corresponding to power output
Determine that the optimum frequency of radiofrequency signal and optimum phase include with reflection power：
The frequency synthesis unit is controlled to produce that multiple phases are identical and radiofrequency signal that frequency is different；
Output work corresponding to identical from the multiple phase based on the power amplification unit and radiofrequency signal that frequency is different
Rate and reflection power calculate multiple first standing wave values of microwave oven cavity；
Using the frequency of radiofrequency signal corresponding to minimum standing wave value in the multiple first standing wave value as optimum frequency；
The frequency synthesis unit is controlled to produce multiple different radiofrequency signals of phase with optimum frequency；
Based on the power amplification unit from it is the multiple with optimum frequency and corresponding to the different radiofrequency signal of phase it is defeated
Go out power and reflection power calculates multiple second standing wave values of microwave oven cavity；
Using the phase of radiofrequency signal corresponding to minimum standing wave value in the multiple second standing wave value as optimum phase.
10. the method according to claim 11, wherein,
Control the frequency synthesis unit with preset frequency interval produces that multiple phases are identical and radiofrequency signal that frequency is different；
Control the frequency synthesis unit with predetermined phase interval produce it is multiple with optimum frequency and the different radio frequency of phase is believed
Number.
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