CN110189919A - Variable capacitance, radio frequency thawing equipment and its defreezing method - Google Patents
Variable capacitance, radio frequency thawing equipment and its defreezing method Download PDFInfo
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- CN110189919A CN110189919A CN201910511180.2A CN201910511180A CN110189919A CN 110189919 A CN110189919 A CN 110189919A CN 201910511180 A CN201910511180 A CN 201910511180A CN 110189919 A CN110189919 A CN 110189919A
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- capacitance
- sheet metal
- metal structure
- radio frequency
- matching
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Classifications
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/36—Freezing; Subsequent thawing; Cooling
- A23L3/365—Thawing subsequent to freezing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
- H01G5/04—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of effective area of electrode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
- H01G5/04—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of effective area of electrode
- H01G5/06—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of effective area of electrode due to rotation of flat or substantially flat electrodes
Abstract
The present invention provides a kind of variable capacitance, radio frequency thawing equipment and its defreezing methods, comprising: motor, the first sheet metal structure and the second sheet metal structure；It is not in contact with each other between first sheet metal structure and the sheet metal of second sheet metal structure, constitutes capacity plate antenna structure；The motor and first sheet metal structure or second sheet metal structure are drivingly connected, first sheet metal structure or second sheet metal structure are driven, to change the overlapping area between first sheet metal structure and the sheet metal of second sheet metal structure.Make total capacitance value constant to eliminate the process for adjusting entire rf load match circuit component values by adjusting unique series, parallel capacitance, all match circuits are completely fixed from beginning to end；Greatly reduce the big component of power consumption such as inductance, so that one side circuit error reduces, on the other hand reduces the radio-frequency power consumption of entire circuit, improve efficiency.
Description
Technical field
The present invention relates to deforst technique fields, and in particular, to can carry out the radio frequency thawing equipment of interelectrode capacitance compensation
And its defreezing method.
Background technique
Publication number CN107684007A discloses a kind of thawing equipment with lumped inductance formula rf load match circuit
And its operating method, the defrosting system include: RF signal source；Electrode, the electrode need to be thawed negative close to positioning in it
The chamber of load；Transmission path, the transmission path is between the RF signal source and the electrode；With impedance RF load matched
Circuit, the impedance RF load matching circuit is along the transmission road between the output of the RF signal source and the electrode
Diameter is electrically coupled.The system also includes power-sensing circuit, the power-sensing circuit is coupled to the transmission path and is matched
Detection is set to along the reflection signal power of the transmission path.System controller is configured to based on the reflection signal power
The inductance value of the impedance RF load matching circuit is modified, to reduce the ratio of the reflection signal power and forward signal power
Rate.The impedance RF load matching circuit includes multiple fixed value lumped inductors being positioned in fixed inductance region.
The problem of above-mentioned traditional technology, is:
1, the loss of controllable impedance rf load match circuit is big, radio circuit low efficiency；
2, inductance causes error big because of manufacture craft problem, and uncertain factor is more；
3, high power switch is at high cost, and quality stability is poor.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of variable capacitance, radio frequency thawing equipment and its
Defreezing method.
A kind of variable capacitance provided according to the present invention, comprising: motor, the first sheet metal structure and the second sheet metal knot
Structure；
It is not in contact with each other between first sheet metal structure and the sheet metal of second sheet metal structure, constitutes plate electricity
Hold structure；
The motor and first sheet metal structure or second sheet metal structure are drivingly connected, driving described first
Sheet metal structure or second sheet metal structure, to change first sheet metal structure and second sheet metal structure
Sheet metal between overlapping area.
Preferably, first sheet metal structure and at least one in second sheet metal structure are multilayered metal film knot
Structure, interlaced setting between first sheet metal structure and the sheet metal of second sheet metal structure.
Preferably, it is parallel to each other between first sheet metal structure and the sheet metal of second sheet metal structure.
Preferably, the first sheet metal structure described in the motor driven or second sheet metal structure linear motion or rotation
Transhipment is dynamic, to change the overlapping area between first sheet metal structure and the sheet metal of second sheet metal structure.
Preferably, the motor passes through flexible transmission shaft and first sheet metal structure or second sheet metal structure
Connection, thus the first sheet metal structure of driving or second sheet metal structure linear motion.
A kind of radio frequency thawing equipment provided according to the present invention, comprising: defrosting chamber 107 and combination capacitor 108；
The combination capacitor includes: first electrode plate 105, second electrode plate 106 and the first variable capacitance, and described first
Electrode plate 105 and the second electrode plate 106 are arranged in parallel in the defrosting chamber 107, constitute first capacitor；
For to unfrozen object placement space between the first electrode plate 105 and the second electrode plate 106；
The first capacitor and the first variable capacitance serial or parallel connection, first variable capacitance include it is above-mentioned can
Power transformation is held.
Preferably, when the first capacitor is connected with first variable capacitance, one end of the variable capacitance, which receives, to be penetrated
Frequency power, the other end connect the first electrode plate 105, and the second electrode plate 106 is grounded；
When the first capacitor is in parallel with first variable capacitance, one end of the variable capacitance receives radio-frequency power,
Other end ground connection, the first electrode plate 105 receive radio frequency input, and the second electrode plate 106 is grounded.
Preferably, the radio frequency thawing equipment further include:
Radio frequency power source 101: radio-frequency power is provided；
Rf load match circuit: it is connected between the output end of the radio frequency power source and the combination capacitor 108.
Preferably, the radio frequency thawing equipment further include:
Bi-directional RF coupler 109: the output end and the rf load match circuit of the radio frequency power source are connected to
Between, it detects and is transmitted to the forward direction radiofrequency signal of rf load match circuit 102 from radio frequency power source 101 and from rf load
With the reflected reverse radio-frequency signal of circuit 102.
Preferably, the radio frequency power source includes driving circuit and power amplification circuit.
Preferably, the rf load match circuit includes monofocal rf load match circuit 102；
The monofocal rf load match circuit 102 includes: series connection matching capacitance 121, matching capacitance 122 in parallel and simultaneously
Join matching inductance 123；
Input terminal of the one end for matching capacitance 121 of connecting as the monofocal rf load match circuit 102, the other end
Output end as the monofocal rf load match circuit 102；
One end of matching capacitance 122 in parallel and matching inductance 123 in parallel is connected to the series connection matching capacitance 121
Both ends, other end ground connection.
Preferably, the series connection matching capacitance 121 is replaced with into variable in-line matching capacitance 161, by the matching in parallel
Capacitor 122 replaces with variable parallel matching capacitance 162.
Preferably, the series connection matching capacitance 121 is replaced with into series connection matching inductance 124, by the matching capacitance in parallel
122 replace with matching inductance 125 in parallel.
Preferably, the radio frequency thawing equipment further includes balun circuit 110, and the balun circuit 110 is connected to described penetrate
Between frequency power source 101 and the rf load match circuit, the rf load match circuit is differential type rf load
With circuit 192, the differential type rf load match circuit 192 connects the both ends of the combination capacitor 108；
The differential type rf load match circuit 192 includes: series connection matching capacitance 128, series connection matching capacitance 130, simultaneously
Join matching capacitance 129 and matching inductance 127 in parallel；
An input terminal of the one end for matching capacitance 128 of connecting as the differential type rf load match circuit 192, separately
An output end of the one end as the differential type rf load match circuit 192；
Another input terminal of the one end for matching capacitance 130 of connecting as the differential type rf load match circuit 192,
Another output of the other end as the differential type rf load match circuit 192；
The both ends of matching capacitance 129 in parallel are connected to the series connection matching capacitance 128 and the matching capacitance 130 of connecting
Ipsilateral, the both ends of matching inductance 127 in parallel are connected to the series connection matching capacitance 128 and the another of matching capacitance 130 of connecting
One is ipsilateral.
Preferably, the series connection matching capacitance 128 is replaced with into variable in-line matching capacitance 168, the series connection is matched
Capacitor 130 replaces with variable in-line matching capacitance 170, and the matching capacitance 129 in parallel is replaced with variable parallel matching capacitance
169。
Preferably, the series connection matching capacitance 128 is replaced with into series connection matching inductance 131, by the series connection matching capacitance
130 replace with series connection matching inductance 134, and the matching capacitance 129 in parallel is replaced with matching inductance 132 in parallel.
A kind of defreezing method of the radio frequency thawing equipment provided according to the present invention is held using above-mentioned radio frequency thawing equipment
Row following steps:
Defrosting step: in course of defrosting, by adjusting the capacitance of first variable capacitance, make the combination capacitor
Total capacitance is constant, or make the combination capacitor total capacitance variation within preset variation range.
Preferably, further includes:
Calibration steps: in the case where defrosting 107 cavity of chamber, the capacitance of first variable capacitance is calibrated, and/or every
It is secondary to adjust the capacitance initial value of first variable capacitance when unfrozen object is put into defrosting chamber 107.
Preferably, further includes:
Stop step: according to the time set by user or stopping operation stopping defrosting；Alternatively,
According in the capacitance, capacitance initial value and course of defrosting of first variable capacitance, collected reverse radio-frequency
Changing value or rate of change of the signal relative to the amplitude and phase of forward direction radiofrequency signal, in the changing value or variation speed
Rate stops thawing when reaching preset value.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, make total capacitance value constant to eliminate and adjust entire radio frequency by adjusting unique series, parallel capacitance
The process of load matching circuit component values, all match circuits are completely fixed from beginning to end；
2, greatly reduce the big component of power consumption such as inductance, so that one side circuit error reduces, on the other hand make entire
The radio-frequency power consumption of circuit reduces, and improves efficiency；
3, compared with multiple high-power RF switching circuits, the series-parallel capacitor cost of motor and structural member is substantially reduced；
4, easy to accomplish, control complexity of the software complexity far below control one group of high-power RF switch of a motor
Degree.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram of the first embodiment of radio frequency thawing equipment of the present invention；
Fig. 2 is the structural schematic diagram of the second embodiment of radio frequency thawing equipment of the present invention；
Fig. 3 is the schematic diagram designed using monofocal fixed RF load matching circuit；
Fig. 4 is the schematic diagram using monofocal variable capacitance rf load Match circuits；
Fig. 5 is the schematic diagram using monofocal fixed inductance rf load Match circuits；
Fig. 6 is the structural schematic diagram of the 3rd embodiment of radio frequency thawing equipment of the present invention；
Fig. 7 is the structural schematic diagram of the fourth embodiment of radio frequency thawing equipment of the present invention；
Fig. 8 is the schematic diagram designed using differential type formula fixed RF load matching circuit；
Fig. 9 is the schematic diagram using differential type formula variable capacitance rf load Match circuits；
Figure 10 is the schematic diagram using differential type fixed inductance rf load Match circuits；
Figure 11 is the capacitance variations schematic diagram of stepper motor driven rotating variable capacitor；
Figure 12 is the capacitance variations schematic diagram of stepper motor driven translating variable capacitor；
Figure 13 is the preceding amplitude discrimination phase discriminator schematic diagram to radiofrequency signal and reverse radio-frequency signal.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
As shown in Fig. 1 to 5, a kind of radio frequency thawing equipment provided by the invention, comprising: defrosting chamber 107, combination capacitor 108,
Radio frequency power source 101, rf load match circuit and bi-directional RF coupler 109.Radio frequency power source 101 provides radio-frequency power,
Rf load match circuit is connected between the output end of radio frequency power source and combination capacitor 108.Bi-directional RF coupler 109 connects
It connects between the output end and rf load match circuit of radio frequency power source.Bi-directional RF coupler 109 is used to detect from radio frequency
The radio-frequency power that power source 101 is transmitted to rf load match circuit 102 obtain before to radiofrequency signal, and detection is from rf load
The reflected radio-frequency power of match circuit 102 obtains reverse radio-frequency signal.
Combination capacitor includes: first electrode plate 105, second electrode plate 106 and the first variable capacitance, first electrode plate
105 are arranged in parallel in defrosting chamber 107 with second electrode plate 106, constitute first capacitor；First electrode plate 105 and second electrode
For to unfrozen object placement space between plate 106；First capacitor and the first variable capacitance serial or parallel connection.
Rf load match circuit in Fig. 1 and Fig. 2 can be realized using different circuit structures.First capacitor and the
When one variable capacitance is connected, one end of variable capacitance receives radio-frequency power, and the other end connects first electrode plate 105, second electrode
Plate 106 is grounded；When first capacitor is in parallel with the first variable capacitance, one end of variable capacitance receives radio-frequency power, and the other end is grounded,
First electrode plate 105 receives radio frequency input, and second electrode plate 106 is grounded.Radio frequency power source includes that driving circuit and power are put
Big circuit.
It is shown in FIG. 1 using shunt capacitance between the work of monofocal radio frequency thawing equipment for changing capacitor electrode and compensating
It is as follows to make principle:
Radio-frequency power passes through after being issued by radio frequency power source 101 enters radio frequency matching circuit 102 by bidirectional coupling circuit 109
Entered back into after matching by the first electrode plate 105 that is placed in parallel in variable capacitance 103 and defrosting chamber 107 and second electrode plate 106 it
Between the circuit that composes in parallel of the capacitor that is formed.Due to the first electrode plate 105 and second electrode plate being placed in parallel in defrosting chamber 107
The capacitor formed between 106 is with the type, volume, shape, weight of food materials between two-plate, position, temperature are different and different, and food
Material is once put into defrosting chamber, the type of food materials, volume, shape, weight, position will not usually change again but its temperature with
The progress of course of defrosting and constantly rise so that between the first electrode plate 105 being placed in parallel and second electrode plate 106
Effective dielectric constant variation, as a result causes the capacitance between the first electrode plate 105 being placed in parallel and second electrode plate 106 to become
Change.The capacitance for changing shunt capacitance 103 at this time makes the first electrode plate being placed in parallel in variable capacitance 103 and defrosting chamber 107
Total capacitance 108 after the capacitor formed between 105 and second electrode plate 106 is in parallel is constant, to greatly simplify rf load
Implementation method with circuit while the loss for substantially reducing rf load match circuit.
It is shown in Fig. 2 using series capacitance between the work of monofocal radio frequency thawing equipment for changing capacitor electrode and compensating
It is as follows to make principle:
Radio-frequency power passes through after being issued by radio frequency power source 101 enters rf load match circuit by bidirectional coupling circuit 109
The first electrode plate 105 and second electrode plate by being placed in parallel in variable capacitance 183 and defrosting chamber 107 are entered back into after 102 matchings
The circuit that the capacitor formed between 106 is composed in series.Due to the first electrode plate 105 and second being placed in parallel in defrosting chamber 107
The capacitor formed between electrode plate 106 with the type, volume, shape, weight of food materials between two-plate, position, temperature difference without
Together, and food materials are once put into defrosting chamber, and the type of food materials, volume, shape, weight, position will not usually change again but it
Temperature constantly rises first electrode plate 105 and second electrode plate so that being placed in parallel with the progress of course of defrosting
Effective dielectric constant variation between 106, as a result causes between the first electrode plate 105 being placed in parallel and second electrode plate 106
Capacitance variation.Change what the capacitance of series capacitance 183 to be placed in parallel in variable capacitance 183 and defrosting chamber 107 at this time
Total capacitance 108 after the capacitor formed between first electrode plate 105 and second electrode plate 106 is in parallel is constant, to greatly simplify
The implementation method of rf load match circuit, the loss for substantially reducing rf load match circuit simultaneously.
Fig. 3 is a kind of scheme using single-ended fixed rf load Match circuits；The matching of monofocal rf load
Circuit 102 includes: series connection matching capacitance 121, matching capacitance 122 in parallel and matching inductance 123 in parallel；Series connection matching capacitance 121
Input terminal of the one end as monofocal rf load match circuit 102, the other end is as monofocal rf load match circuit
102 output end；One end of matching capacitance 122 in parallel and matching inductance 123 in parallel is connected to series connection matching capacitance 121
Both ends, other end ground connection.
Fig. 4 is a kind of scheme using single-ended variable capacitance rf load Match circuits；To connect matching capacitance
121 replace with variable in-line matching capacitance 161, and matching capacitance 122 in parallel is replaced with variable parallel matching capacitance 162.
Fig. 5 is then a kind of scheme using single-ended fixed inductance formula rf load Match circuits；By series connection matching electricity
Hold 121 and replace with series connection matching inductance 124, matching capacitance 122 in parallel is replaced with into matching inductance 125 in parallel.
More kinds of rf load Match circuits schemes can also be listed, details are not described herein again.
Fig. 6 is a kind of showing between the differential type radio frequency thawing equipment that variation capacitor compensates electrode using shunt capacitance
It is intended to, and Fig. 7 is that another kind uses series capacitance between the differential type radio frequency thawing equipment that variation capacitor compensates electrode
Schematic diagram.Radio frequency thawing equipment increases balun circuit 110, and balun circuit 110 is connected to radio frequency power source 101 and rf load
Between match circuit, rf load match circuit is differential type rf load match circuit 192, differential type rf load matching electricity
The both ends of the connection of road 192 combination capacitor 108.
Except the radio-frequency power for the radio-frequency power cut-in method of monofocal being changed to using balun circuit 110 differential type in Fig. 6
Outside cut-in method, shown in other principles and Fig. 1.
Except the radio-frequency power for the radio-frequency power cut-in method of monofocal being changed to using balun circuit 110 differential type in Fig. 7
Outside cut-in method, other principles and it is shown in Fig. 2.
Rf load match circuit in Fig. 6 and Fig. 7 can be realized using different circuit structures.As shown in figure 8, poor
Fraction rf load match circuit 192 includes: series connection matching capacitance 128, series connection matching capacitance 130,129 and of matching capacitance in parallel
Matching inductance 127 in parallel；An input of the one end for matching capacitance 128 of connecting as differential type rf load match circuit 192
End, an output end of the other end as differential type rf load match circuit 192；One end conduct for matching capacitance 130 of connecting
Another input terminal of differential type rf load match circuit 192, the other end is as differential type rf load match circuit 192
Another output；The both ends of matching capacitance 129 in parallel are connected to series connection matching capacitance 128 and the same of matching capacitance 130 of connecting
Side, the both ends of matching inductance 127 in parallel are connected to the another ipsilateral of series connection matching capacitance 128 and matching capacitance 130 of connecting.
Fig. 9 is a kind of scheme using difference variable capacitance rf load Match circuits；To connect matching capacitance
128 replace with variable in-line matching capacitance 168, and series connection matching capacitance 130 is replaced with variable in-line matching capacitance 170, will simultaneously
Connection matching capacitance 129 replaces with variable parallel matching capacitance 169.
Figure 10 is then a kind of scheme using difference fixed inductance formula rf load Match circuits；By series connection matching electricity
Hold 128 and replace with series connection matching inductance 131, series connection matching capacitance 130 is replaced with into series connection matching inductance 134, parallel connection is matched
Capacitor 129 replaces with matching inductance 132 in parallel.
More kinds of rf load Match circuits schemes can also be listed, details are not described herein again.
Core of the invention main points be compensated using variable capacitance 103 or 183 by be placed in parallel in defrosting chamber 107
The capacitor formed between one electrode plate 105 and second electrode plate 106 is due between first electrode plate 105 and second electrode plate 106
The types of food materials, volume, shape, weight, position, temperature is different and the capacitance variation that generates, thus make 103 or 183 with
The total capacitance value that capacitor between the first electrode plate 105 being placed in parallel in defrosting chamber 107 and second electrode plate 106 is formed is basic
Not with the type of food materials, volume, shape, weight, position, temperature is different and changes, to enormously simplify rf load matching
The realization of circuit.And the device to play a crucial role in the present invention be resistant to high-power, big voltage, high current can power transformation
Hold component.Rotary and parallel-moving type multi-layer air capacitor design driven by stepper motors is respectively shown in Figure 11 and Figure 12
Scheme.
Variable capacitance includes motor, the first sheet metal structure and the second sheet metal structure.First sheet metal structure and second
It is not in contact with each other between the sheet metal of sheet metal structure, constitutes capacity plate antenna structure；Motor and the first sheet metal structure or the second gold medal
Belong to chip architecture to be drivingly connected, drive the first sheet metal structure or the second sheet metal structure, thus change the first sheet metal structure with
Overlapping area between the sheet metal of second sheet metal structure.At least one in first sheet metal structure and the second sheet metal structure
For multiple layer metal chip architecture, stacked conducting plate structure may be constructed the electrode for resisting big voltage and high current, the first sheet metal structure
The interlaced setting between the sheet metal of the second sheet metal structure.The metal of first sheet metal structure and the second sheet metal structure
It can be parallel to each other between piece.
In Figure 11, motor 201 connects the electrode 203 of the first sheet metal structure 206 by connection shaft 202.Second metal
The electrode of chip architecture 205 is electrode 204.Rotate the first sheet metal structure 206 by motor 201, the first sheet metal structure 206 with
Overlapping area between the sheet metal of second sheet metal structure 205 changes, according to calculation formula (the known skill of capacity plate antenna
Art) it is found that overlapping area and spacing between the capacitance size and sheet metal of capacity plate antenna are related, so that realizing can power transformation
The capacitance variation of appearance.
In Figure 12, the rotation axis 212 of motor 211 connects flexible transmission shaft 213, and the transmission shaft 213 that stretches connects sheet metal knot
The connecting pin 214 of structure 215, the electrode of sheet metal structure 216 are electrode 217.Pass through the laterally driven sheet metal structure of motor 211
215 make the overlapping area between sheet metal structure 215 and sheet metal structure 216 change, public according to the calculating of capacity plate antenna
Formula (well-known technique) it is found that overlapping area and spacing between the capacitance size and sheet metal of capacity plate antenna are related, thus
Realize the capacitance variation of variable capacitance.
Figure 13 is amplitude discrimination phase discriminator 195, and input terminal (1) and (2) are respectively through bidirectional coupler 109 and before obtaining
To radiofrequency signal and reverse radio-frequency signal；Its output end (3) and (4) are the reverse radio-frequency signal that amplitude discrimination phase discriminator detects respectively
Amplitude and phase relative to forward direction radiofrequency signal are poor.
Working principle used in the present invention is as follows:
One of basic principle: the dielectric constant of air is approximately equal to 1, hardly changes with its temperature change.
Capacitance C is determined by following formula between two: two pieces of battery plates being placed in parallel of basic principle:
Wherein ∈ r is effective dielectric constant between pole plate；A is the corresponding area of two-plate；D be between two parallel plate electrodes away from
From.
The three of basic principle: its dielectric is normal during food materials gradually rise for -40 DEG C to 25 DEG C of room temperatures from freezing temperature
Number rises with food materials temperature and monotone increasing is presented.
It is placed between the pole plate that effective dielectric constant between the pole plate that the four: two of basic principle are placed in parallel is placed in parallel by two
The shapes of food materials, size, weight, position, type and temperature determine.
The five of basic principle: as shown in Fig. 7-10, shape, size, weight, type and the certain frost food materials of temperature are put
Enter to carry out between the pole plate that two are placed in parallel during heating thaws to 25 DEG C of room temperatures, between two-plate in effective dielectric constant dullness
It rises, by capacitance between two-plate known to above-mentioned basic principle two also monotone increasing therewith.
The six of basic principle: according to capacitance in series-parallel theory, when placing food materials to be thawed between two plate electrodes
Outside two plate electrodes again one variable capacitance of a variable capacitance in parallel or series connection when, can suitably select in parallel or series
Variable capacitance range and adjust its capacitance so that two plate electrodes be formed by capacitor in food materials course of defrosting with it is external
The total capacitance value that is collectively formed of capacitor in parallel or series remain unchanged.
The seven of basic principle: wait the position for heating food materials that thaws, type, shape, volume, again between upper and lower two-plate
When amount, temperature etc. are different, dielectric loss can change.Thus the amplitude and phase for causing reverse radio-frequency signal become
Change.
Food materials 104 are heated wait thaw due to being seated between the first electrode plate 105 being placed in parallel and second electrode plate 106
The variation such as position, type, shape, volume, weight, temperature when its dielectric loss can change to cause reverse radio-frequency letter
Number amplitude and phase change, by between the first electrode plate 105 being placed in parallel and second electrode plate 106 wait solve
Position, type, shape, volume, weight, the temperature of food materials 104 etc. for freezing heating record reverse radio-frequency signal after being changed
Relative to the amplitude and phase changing value of forward direction radiofrequency signal and the rate of variation and be made into control table, by Fig. 1,2 or
Amplitude discrimination phase discriminator 195 in Fig. 6, bidirectional coupler 109 and Figure 13 in 7 detects reversely to penetrate in actual moving process
Frequency signal relative to forward direction radiofrequency signal amplitude and phase changing value and judged with this wait thaw required for heating food materials 104
It thaws heating time.Different shape under the charting, weight, size, position, type food materials first when corresponding to different temperatures
The capacitance and rate of change of the capacitor formed between electrode plate 105 and second electrode plate 106, judgement is thawed when for equipment operation
The foundation of heating time.
It can be by carrying out calibration variable capacitance capacitance in cavity and in each course of defrosting in production practices
The mode of capacitor 103 or 183 initial values is determined when food materials have just been put into defrosting chamber 107 to make the more efficient work of defrosting chamber
Make.A kind of defreezing method of radio frequency thawing equipment provided by the invention executes following step using above-mentioned radio frequency thawing equipment
It is rapid:
Calibration steps: in the case where defrosting 107 cavity of chamber, the capacitance of the first variable capacitance is calibrated, and/or every time will
When unfrozen object is put into defrosting chamber 107, the capacitance initial value of the first variable capacitance is adjusted；
Defrosting step: in course of defrosting, by adjusting the capacitance of the first variable capacitance, make total capacitance of combination capacitor not
Become, or make combination capacitor total capacitance variation within preset variation range.
The present invention using variable capacitance 103 or 183 with the first electrode plate 105 that is placed in parallel in defrosting chamber 107 and the
The capacitor formed between two electrode plates 106 is in parallel or series and according in defrosting chamber 107 between two electrode plates being placed in parallel
It the difference of food materials volume, weight, type, shape etc. and is placed in parallel caused by the difference of food materials temperature in course of defrosting
First electrode plate 105 and second electrode plate 106 between the variation of capacitance of capacitor that is formed is corresponding adjusts variable parallel capacitor
103 or variable in-line capacitor 183 value so that 108 value of total capacitance of two capacitors is constant, thus not changing rf load
Still reach larger radio-frequency power in the case where match circuit 102 or 192 and enters rf load match circuit 102 or 192 and most
Enter the effect in defrosting chamber 107 eventually.
Using the first electrode plate 105 and second electrode being placed in parallel in variable capacitance 103 or 183 and defrosting chamber 107
The capacitor formed between plate 106 is in parallel or series and according to the food materials body in defrosting chamber 107 between two electrode plates being placed in parallel
The difference of product, weight, type, shape etc. and be placed in parallel caused by the difference of food materials temperature in course of defrosting first
The variation of the capacitance of the capacitor formed between electrode plate 105 and second electrode plate 106.
Adjust the value of variable parallel capacitor 103 or variable in-line capacitor 183 so that 108 value of total capacitance of two capacitors not
Become and is born to still reach larger radio-frequency power in the case where not changing rf load match circuit 102 or 192 and enter radio frequency
It carries match circuit 102 or 192 and eventually enters into the effect in defrosting chamber 107.
Further adjust 168, the 170 capacitances optimization in the variable capacitance 161 or 192 in rf load match circuit 102
Matching effect.
The carefully inductance value of design inductance 123 or 127 makes other components of match circuit 102 be all made of capacitor and (such as schemes
Capacitor 121 in 3 and 122) Lai Shixian, to reduce inductance component bring added losses in match circuit 102.
No according to food materials volume, weight, type, shape in defrosting chamber 107 between two electrode plates being placed in parallel etc.
First electrode plate 105 and second electrode plate same and be placed in parallel caused by the difference of food materials temperature in course of defrosting
The variation of the capacitance of the capacitor formed between 106 makes empirical table, different shape, weight, size, position under the charting
The capacitance of the capacitor set, formed between first electrode plate 105 and second electrode plate 106 when the food materials of type correspond to different temperatures,
For judging the foundation of thawing time when equipment operation.
Food materials to be thawed are put into the first electrode plate 105 that is placed in parallel in defrosting chamber 107 and second electrode plate 106 it
Between and do not start to test capacitor between the first electrode plate 105 being placed in parallel and second electrode plate 106 in defrosting chamber 107 before thawing
Value compare cavity when variable quantity determine shape, weight, size, position, type and the thawing time of food materials to be thawed.
It is formed between the first electrode plate 105 being placed in parallel in defrosting chamber 107 when due to cavity and second electrode plate 106
Capacitance is minimum, the initial value of external variable parallel capacitor 103 or series capacitance 183 can be arranged in advance, using it as producing line
On foundation that every equipment is calibrated, to eliminate the inconsistency of production.
Translated using may be programmed stepper motor driven mode or rotary two multi-layer planars capacitor plate it is opposite
Position is to change capacitance.
Pass through the food materials 104 heating to be thawed between the first electrode plate 105 being placed in parallel and second electrode plate 106
Position, type, shape, volume, weight, temperature etc. be changed after record reverse radio-frequency signal and believe relative to forward direction radio frequency
Number amplitude and phase changing value and variation rate and be made into control table, pass through the bidirectional couple in Fig. 1,2 or Fig. 6,7
Amplitude discrimination phase discriminator 195 in device 109 and Figure 13 detects that reverse radio-frequency signal is penetrated relative to forward direction in actual moving process
The amplitude and phase changing value or rate of change of frequency signal are simultaneously judged with this wait heating of thawing required for heating food materials 104 of thawing
Time.
In the description of the present application, it is to be understood that term " on ", "front", "rear", "left", "right", " is erected at "lower"
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on the figure or position
Relationship is set, description the application is merely for convenience of and simplifies description, rather than the device or element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (19)
1. a kind of variable capacitance characterized by comprising motor, the first sheet metal structure and the second sheet metal structure；
It is not in contact with each other between first sheet metal structure and the sheet metal of second sheet metal structure, constitutes capacity plate antenna knot
Structure；
The motor and first sheet metal structure or second sheet metal structure are drivingly connected, and drive first metal
Chip architecture or second sheet metal structure, to change the gold of first sheet metal structure Yu second sheet metal structure
Belong to the overlapping area between piece.
2. variable capacitance according to claim 1, which is characterized in that first sheet metal structure and second metal
At least one in chip architecture is multiple layer metal chip architecture, the metal of first sheet metal structure and second sheet metal structure
Interlaced setting between piece.
3. variable capacitance according to claim 1, which is characterized in that first sheet metal structure and second metal
It is parallel to each other between the sheet metal of chip architecture.
4. variable capacitance according to claim 1, which is characterized in that the first sheet metal structure described in the motor driven or
The second sheet metal structure linear motion or rotary motion, to change first sheet metal structure and second metal
Overlapping area between the sheet metal of chip architecture.
5. variable capacitance according to claim 4, which is characterized in that the motor passes through flexible transmission shaft and described first
Sheet metal structure or second sheet metal structure connection, thus the first sheet metal structure of driving or second sheet metal structure
Linear motion.
6. a kind of radio frequency thawing equipment characterized by comprising defrosting chamber (107) and combination capacitor (108)；
The combination capacitor includes: first electrode plate (105), second electrode plate (106) and the first variable capacitance, and described first
Electrode plate (105) and the second electrode plate (106) are arranged in parallel in the defrosting chamber (107), constitute first capacitor；
For to unfrozen object placement space between the first electrode plate (105) and the second electrode plate (106)；
The first capacitor and the first variable capacitance serial or parallel connection, first variable capacitance includes claim 1 to 5
Variable capacitance described in any one.
7. radio frequency thawing equipment according to claim 6, which is characterized in that the first capacitor and described first can power transformation
When holding series connection, one end of the variable capacitance receives radio-frequency power, and the other end connects the first electrode plate (105), and described the
Two electrode plates (106) ground connection；
When the first capacitor is in parallel with first variable capacitance, one end of the variable capacitance receives radio-frequency power, another
End ground connection, the first electrode plate (105) receive radio frequency input, second electrode plate (106) ground connection.
8. radio frequency thawing equipment according to claim 6, which is characterized in that the radio frequency thawing equipment further include:
Radio frequency power source (101): radio-frequency power is provided；
Rf load match circuit: it is connected between the output end of the radio frequency power source and the combination capacitor (108).
9. radio frequency thawing equipment according to claim 8, which is characterized in that the radio frequency thawing equipment further include:
Bi-directional RF coupler (109): be connected to the radio frequency power source output end and the rf load match circuit it
Between, it detects and is transmitted to the forward direction radiofrequency signal of rf load match circuit (102) from radio frequency power source (101) and from rf load
The reflected reverse radio-frequency signal of match circuit (102).
10. radio frequency thawing equipment according to claim 8, which is characterized in that the radio frequency power source includes driving circuit
And power amplification circuit.
11. radio frequency thawing equipment according to claim 8, which is characterized in that the rf load match circuit includes single
End formula rf load match circuit (102)；
The monofocal rf load match circuit (102) include: series connection matching capacitance (121), matching capacitance in parallel (122) and
Matching inductance (123) in parallel；
Input terminal of the one end of series connection matching capacitance (121) as the monofocal rf load match circuit (102), the other end
Output end as the monofocal rf load match circuit (102)；
One end of matching capacitance (122) in parallel and matching inductance (123) in parallel is connected to the series connection matching capacitance (121)
Both ends, the other end ground connection.
12. radio frequency thawing equipment according to claim 11, which is characterized in that replace the series connection matching capacitance (121)
Variable in-line matching capacitance (161) are changed to, the matching capacitance (122) in parallel is replaced with into variable parallel matching capacitance (162).
13. radio frequency thawing equipment according to claim 11, which is characterized in that replace the series connection matching capacitance (121)
It is changed to series connection matching inductance (124), the matching capacitance (122) in parallel is replaced with into matching inductance in parallel (125).
14. radio frequency thawing equipment according to claim 8, which is characterized in that the radio frequency thawing equipment further includes balun
Circuit (110), the balun circuit (110) be connected to the radio frequency power source (101) and the rf load match circuit it
Between, the rf load match circuit is differential type rf load match circuit (192), the differential type rf load matching electricity
Road (192) connects the both ends of the combination capacitor (108)；
The differential type rf load match circuit (192) include: series connection matching capacitance (128), series connection matching capacitance (130),
Matching capacitance (129) in parallel and matching inductance (127) in parallel；
An input terminal of the one end of series connection matching capacitance (128) as the differential type rf load match circuit (192), separately
An output end of the one end as the differential type rf load match circuit (192)；
Another input terminal of one end of series connection matching capacitance (130) as the differential type rf load match circuit (192),
Another output of the other end as the differential type rf load match circuit (192)；
The both ends of matching capacitance (129) in parallel are connected to the series connection matching capacitance (128) and the matching capacitance of connecting (130)
It is ipsilateral, the both ends of matching inductance (127) in parallel are connected to the series connection matching capacitance (128) and the matching capacitance of connecting
(130) another ipsilateral.
15. radio frequency thawing equipment according to claim 14, which is characterized in that replace the series connection matching capacitance (128)
Variable in-line matching capacitance (168) are changed to, the series connection matching capacitance (130) is replaced with into variable in-line matching capacitance (170),
The matching capacitance (129) in parallel is replaced with into variable parallel matching capacitance (169).
16. radio frequency thawing equipment according to claim 14, which is characterized in that replace the series connection matching capacitance (128)
It is changed to series connection matching inductance (131), the series connection matching capacitance (130) is replaced with into series connection matching inductance (134), by described in simultaneously
Connection matching capacitance (129) replaces with matching inductance in parallel (132).
17. a kind of defreezing method of radio frequency thawing equipment, which is characterized in that using described in any one of claim 6 to 16
Radio frequency thawing equipment, execute following steps:
Defrosting step: in course of defrosting, by adjusting the capacitance of first variable capacitance, make total appearance of the combination capacitor
Be worth it is constant, or make the combination capacitor total capacitance variation within preset variation range.
18. the defreezing method of radio frequency thawing equipment according to claim 17, which is characterized in that further include:
Calibration steps: in the case where defrosting chamber (107) cavity, the capacitance of first variable capacitance is calibrated, and/or each
The capacitance initial value of first variable capacitance will be adjusted when unfrozen object is put into defrosting chamber (107).
19. the defreezing method of radio frequency thawing equipment according to claim 18, which is characterized in that further include:
Stop step: according to the time set by user or stopping operation stopping defrosting；Alternatively,
According in the capacitance, capacitance initial value and course of defrosting of first variable capacitance, collected reverse radio-frequency signal
The changing value or rate of change of amplitude and phase relative to forward direction radiofrequency signal are arrived in the changing value or the rate of change
Stop thawing when up to preset value.
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| CN201910511180.2A CN110189919A (en) | 2019-06-13 | 2019-06-13 | Variable capacitance, radio frequency thawing equipment and its defreezing method |
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| CN201910511180.2A CN110189919A (en) | 2019-06-13 | 2019-06-13 | Variable capacitance, radio frequency thawing equipment and its defreezing method |
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| WO2021114951A1 (en) * | 2019-12-13 | 2021-06-17 | 青岛海尔电冰箱有限公司 | Control method for heating device, and heating device |
| WO2021139363A1 (en) * | 2020-01-06 | 2021-07-15 | 青岛海尔电冰箱有限公司 | Control method for heating device, and heating device |
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