CN209251648U - A kind of thawing apparatus using switch matching module - Google Patents
A kind of thawing apparatus using switch matching module Download PDFInfo
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- Control Of High-Frequency Heating Circuits (AREA)
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- Freezing, Cooling And Drying Of Foods (AREA)
Abstract
The utility model provides a kind of thawing apparatus using switch matching module, including inductance L3, one end of the inductance L3 are connect with power take-off；Inductance L5, one end of the inductance L5 are connect with the other end of the inductance L3；One end of first bypass, first bypass is connect with the power take-off, the other end ground connection of first bypass；One end of second bypass, second bypass is connect with the other end of the inductance L3, the other end ground connection of second bypass.Compared with prior art, the utility model has the advantage that the resolution ratio that 1) can promote tuning, and can widen the compensation range of food, reduces the quantity of switch, to reduce cost.2) L-type match circuit is added using L-type, the requirement of the quantity and performance of switching device can be greatly reduced, have fabulous improvement using safe and service life etc. to thawing apparatus.
Description
Technical field
The utility model relates to home electric field, especially a kind of thawing apparatus using switch matching module.
Background technique
The existing method by heat exchange pattern to thaw mainly has air thawing, water to impregnate defrosting, refrigerator cold-storage thaws,
Defrosting plate thaws, these method thawing times are long, and are easy to breed bacterium under 5~60 degrees Celsius of environment of course of defrosting
(except refrigerator cold-storage thaws), sanitary condition causes anxiety；Defrosting plate thaws, and foodstuff surface is by contacting conduction heat quickly with defrosting plate
It measures (time is more quicker), but food therein thermal conductivity itself is low, inside and outside uniformity is poor, and the big food of thickness is particularly evident.And it is micro-
Wave furnace thaws, although being thawed by electromagnetic field penetration mode, the time is more quicker, and due to frequency height, inside and outside uniformity is special
Not poor, surface temperature can be very high, and bacterial reproduction may be quickly.
Prior art China utility model patent " thawing equipment and its operation side with lumped inductance formula matching network
Method " (application publication number: CN107684007A) disclose a kind of defrosting system, and the defrosting system includes: RF signal source；Electricity
Pole, the electrode need to be thawed the chamber of load close to positioning in it；Transmission path, the transmission path is in the RF signal
Between source and the electrode；And impedance matching network, the impedance matching network along the RF signal source output with it is described
The transmission path between electrode is electrically coupled.The system also includes power-sensing circuit, the power-sensing circuit coupling
To the transmission path and it is configured to detect reflection signal power along the transmission path.System controller is configured to
The inductance value of the impedance matching network is modified, based on the reflection signal power to reduce the reflection signal power and forward direction
The ratio of signal power.The impedance matching network includes multiple fixed value lumped inductances being positioned in fixed inductance region
Device.
Utility model content
For the defects in the prior art, the utility model aim is to provide a kind of use for solving above-mentioned technical problem
Switch the thawing apparatus of matching module.
In order to solve the above technical problems, the utility model provides a kind of switch matching module, including inductance L3, the inductance
One end of L3 is connect with power take-off；Inductance L5, one end of the inductance L5 are connect with the other end of the inductance L3；First
One end of bypass, first bypass is connect with the power take-off, the other end ground connection of first bypass；By in the of second
The one end on road, second bypass is connect with the other end of the inductance L3, the other end ground connection of second bypass.
Preferably, first bypass includes: inductance L1, and one end of the inductance L1 is connect with the power take-off；
Inductance L2, one end of the inductance L2 are connect with the other end of the inductance L1, the other end ground connection of the inductance L2.
Preferably, second bypass includes: inductance L4, and the other end of one end of the inductance L4 and the inductance L3 connect
It connects, the other end ground connection of the inductance L4.
Preferably, second bypass includes: inductance L4, and the other end of one end of the inductance L4 and the inductance L3 connect
It connects；Inductance L6, one end of the inductance L6 are connect with the other end of the inductance L4, the other end ground connection of the inductance L6.
Preferably, the inductance L3 is controllable impedance；The inductance L5 is fixed inductance；The inductance L1 is fixed electricity
Sense；The inductance L2 is controllable impedance；The inductance L4 is fixed inductance.
Preferably, the inductance L3 is fixed inductance；The inductance L5 is fixed inductance；The inductance L1 is fixed electricity
Sense；The inductance L2 is controllable impedance；The inductance L4 is fixed inductance；The inductance L6 is controllable impedance.
A kind of thawing apparatus, includes at least: defrosting cavity, defrosting cavity, and the defrosting cavity needs are or comprising gold
Belong to material, operating room is equipped in the defrosting cavity；Control unit, described control unit are arranged on the defrosting cavity；
Radio-frequency power output module, the radio-frequency power output module are arranged on the defrosting cavity, and the radio-frequency power exports mould
Block is communicated with described control unit；Measuring unit, the measuring unit are defeated with described control unit and the radio-frequency power respectively
Module connects out；Matching module is switched, the switch matching module is connect with described control unit and the measuring unit respectively,
The radio-frequency power output module output end impedance matching can be found by switching the switching device in the switch matching module
Optimum state；Power module, the power module respectively with described control unit, the radio-frequency power output module and described
Switch matching module connection；Mechanism is radiated, the radiation mechanism is connect with the switch matching module, the radiation mechanism setting
In the lower section of the operating room；Wherein the switch matching module is the switch matching module.
Preferably, the power module includes: adjustable voltage part, fixed voltage part and is communicated with described control unit
Control interface.
Preferably, the radiation mechanism includes: radiating element, and the operating room is non-contactly arranged in the radiating element
Lower section；Feed element, the feed element connect the radiating element and the switch matching module.
Preferably, the radiating element is metal decking, metal grill or metal folding part.
Preferably, the initial output frequency of the radio-frequency power output module is 40.68MHz, and the step-length of adjustment is 5KHz
~10KHz can find the defrosting Frequency point of best match by scan frequency.
Preferably, by initially adjust matching after it is described switch matching module switching state and the radio-frequency power
The Frequency point of the best match of output module determines that defrosting chamber is in unloaded or fully loaded state.
Preferably, color parameter S is dissipated by detecting the radio-frequency power output module output end11Amplitude and phase variation
The degree of stability of rate differentiates to thaw whether complete.
Compared with prior art, the utility model has the advantage that
1) resolution ratio of tuning can be promoted, and the compensation range of food can be widened, reduces the quantity of switch, to reduce
Cost.
2) L-type match circuit is added using L-type, the requirement of the quantity and performance of switching device can be greatly reduced, to defrosting
Device has fabulous improvement using safe and service life etc..
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other spies of the utility model
Sign objects and advantages will become more apparent upon.
Fig. 1 is the utility model thawing apparatus structural schematic diagram；
Fig. 2 is the cavity body structure schematic diagram containing radiating element in the utility model thawing apparatus；
Fig. 3 is the cavity body structure schematic diagram containing bending-type radiating element in the utility model thawing apparatus；
System of the Fig. 4 between the utility model thawing apparatus module connects block diagram；
Fig. 5 is that the controlled power source module of the utility model thawing apparatus connects block diagram；
Fig. 6 is one circuit diagram of switch matching module embodiment of the utility model thawing apparatus；
Fig. 7 is two circuit diagram of switch matching module embodiment of the utility model thawing apparatus；
Fig. 8 is the implementation schematic diagram of the controllable impedance of the utility model thawing apparatus；
Fig. 9 is the electric frequency modulation basic flow chart of the utility model thawing apparatus；
Figure 10 is the groundwork flow chart of the utility model thawing apparatus.
In figure:
1- defrosting cavity 2- fan 3- switchs matching module
4- radio-frequency power output module 5- power module 6- control unit
The operating room 7- display module 8- 9- food
10- insulation board 11- radiating element 12- feed element
Specific embodiment
The utility model is described in detail combined with specific embodiments below.Following embodiment will be helpful to this field
Technical staff further understands the utility model, but does not limit the utility model in any form.It should be pointed out that ability
For the those of ordinary skill in domain, without departing from the concept of the premise utility, several change and modification can also be made.
Fig. 1 is thawing apparatus structural schematic diagram, it describes a kind of implementation of modules layout, radiation assembly position
It is fixed by low-loss insulation board 10 in 1 the inside of defrosting cavity；Switch matching module 3 is located at behind defrosting cavity 1, cable
Or it is connected by conductive rod by the through-hole on trailing flank with radiation assembly, is fixed with insulating sleeve on through-hole, cable or
Conductive rod needs to prevent from contacting with defrosting cavity 1 across insulating sleeve；Radio-frequency power output module 4, power module 5 are located at solution
Freeze the right side of cavity 1, they are connected by cable by the through-hole on right side with switch matching module 3；Control unit 6 is located at
Side to the right before defrosting cavity 1, cable are exported it with radio-frequency power by the aperture on side to the right before defrosting cavity 1
Module 4, power module 5 and switch matching module 3 are connected；UI is located in control unit 6, there is the key convenient for user's control on UI
And display module 7；Fan 2 is mounted on behind defrosting cavity 1 and right side, convenient for defeated to switch matching module 3, radio-frequency power
Module 4 and power module 5 provide wind-cooling heat dissipating out.It thaws on the insulation board 10 that food 9 is placed in operating room 8.Accommodating food 9
Open side be provided with openable and closable door body structure, can effectively prevent the leakage of RF energy when door body structure closes.Defrosting chamber
Body 1 and door body structure needs are or comprising metal material, can just play the role of shielding in this way.Based on the description above, originally
It is fairly simple that the technical staff in field is interpreted as implementation, is laid out not limited to this.
Fig. 2 is the cavity schematic diagram containing radiating element 11, and radiating element 11 is fixed on insulation board 10, under cavity
Side.Radiating element 11 can be one piece of metal decking perhaps metal grill or metal folding part (such as Fig. 3) etc..Metal covering
The edge electric field strength of plate is maximum, marginal portion can suitably be bent downward, the part for keeping electric field strength big is distributed downwards, is mentioned
The uniformity of high thawed foodstuff 9 is the metal decking after edge downward bending in Fig. 3.The shape of metal decking is also unrestricted,
It can be circle, rectangular etc., the shape of metal decking also determines the intracorporal field distribution of chamber, i.e. influence food 9 heats
Uniformity.There is radio frequency high tension on radiating element 11, radiating element 11 cannot be in electrical contact with cavity.Food 9 is placed on insulation board 10
On, such food 9 is relatively close from radiating element 11, and the electric field around radiating element 11 is stronger, thaws high-efficient.Feed element 12 1
End connection radiating element 11, other end connection switch matching module 3, feed element can be metal bar, cable etc., and feed is single
Member cannot have electrical contact with cavity.Zin be feed port toward antenna end input impedance, Zin be put into food 9 weight,
Temperature, shape, the difference of type and it is different, to enable Zin and radio-frequency power output module 4 is constantly in good matching shape
State, it is necessary to which between them plus an impedance transformation module, that is, matching module, while measurement module is for monitoring current matching
State.
System of the Fig. 4 between thawing apparatus module connects block diagram.Alternating current is converted multiple stable outputs by power module 5
DC power supply, be responsible for radio-frequency power output module 4, control unit 6 and switch matching module 3 are powered.Control unit 6 is whole
The control axis of a system completes all status monitorings of system, data analysis, function control and the human-computer interaction of the interface UI, far
The functions such as range monitoring；The size of 4 output frequency of radio-frequency power output module and power is specially controlled, control power module 5
The size of unlatching and output voltage reads the size of electric power output voltage and electric current, opening in control switch matching module 3 simultaneously
Switching state is closed, the radio frequency parameter obtained from measuring unit measurement is received and processed.Radio-frequency power output module 4 can be by direct current
Electric energy is converted into radio frequency high-power electromagnetism field energy.Measuring unit is single for monitoring 4 output end of radio-frequency power output module and radiation
Matching status between the feed end of member 11.It switchs matching module 3 and receives the switch control signal from control unit 6, by spoke
The impedance transformation of 11 feed end of unit is penetrated to the state being close with the impedance of 4 output end of radio-frequency power output module.Radio frequency is high
Power electromagnet field energy passes through measuring unit, and switch matching module 3 reaches the cavity containing radiating element 11.Radiating element 11 is responsible for
Radio-frequency power efficient uniform is sent to food 9 to, the strength electromagnetic field of these high speed variations forces point in food 9
Son, ion etc. carry out strenuous exercise and heat up；Metal cavity fetters energy of electromagnetic field in the cavity, prevents electromagnetic field radiation from arriving
It realizes and quickly and evenly thaws and heating food 9 simultaneously outside cavity.It may also include when actual implementation the utility model and it be provided
The component and device of its function, such as radiator.
Fig. 5~Fig. 8 lists the implementation method of the main functional module of the utility model thawing apparatus, as just ability
Field technique personnel reference, implementation method are not limited to this.
Fig. 5 is by the controlled power of radio-frequency power output module 4, control unit 6, measuring unit and the composition of power module 5
Source module, wherein radio-frequency power output module 4 includes controllable signal source and power amplification link, and power module 5 includes adjustable electric
Laminate section and fixed voltage part.
The adjustable weak radio-frequency signal of the exportable frequency in radio frequency controllable signal source in radio-frequency power output module 4, by controlling
The control signal that unit 6 processed exports controls the output of signal such as unlatching/shutdown signal to control the output state of radiofrequency signal
The frequency range of frequency etc., the utility model is 40.66MHz~40.70MHz, and similar also may be selected other suitable frequency ranges；
The radiofrequency signal of controllable signal source output need to generate the radio frequency high-power energy for defrosting after the amplification of power amplification link
Amount, power amplification link are generally made of two to three-level power amplifying transistor, and power amplifying transistor is relatively common to be
Metal oxide semiconductor transistor or gallium nitride transistor；Control unit 6 provides controllable grid electricity for these transistors
Pressure, the adjustable voltage part of power module 5 provides variable drain voltage for transistor, while control unit 6 controls power supply mould
The size of the output adjustable voltage of block 5.Control unit 6 can be penetrated by changing the size of grid voltage or drain voltage to control
The size of frequency power output module output power.
Measuring unit is used to detect the radio frequency parameter of power amplification link output end, and specially output and reflection power is big
It is small, S11Amplitude and phase.Control unit 6 understands the impedance state of the feed end of radiating element 11 by these radio frequency parameters
And its match condition with power amplification link output end.The implementation method of the utility model measuring unit is RF coupler.
Power module 5 includes at least adjustable voltage part, fixed voltage part and control interface.Control unit 6 can pass through
Power supply control interface is configured the output voltage of adjustable voltage part, and adjustable voltage part is to give radio-frequency power output module
Power amplification link in 4 provides drain voltage, and control unit 6 can also read the voltage of setting and the size of current of supply, this
Sample can monitor power module 5 constantly by the processing of closed loop and whether power amplification link is in normal condition, guarantees system of thawing
Unite power source it is reliable and safe.Control unit 6 need the fixed voltage part in power module 5 provided for it stablize it is normally opened
Fixed voltage.
It is made of in the utility model Fig. 5 radio-frequency power output module 4, control unit 6, measuring unit and power module 5
Subsystem be that a frequency is controllable, power adjustable, matching can survey, and reliable and stable power source system has important and extensive
Application value.In the present invention can scan frequency, find the defrosting Frequency point accordingly with 9 impedance best match of food,
Herein referred to as electric frequency modulation matching.
The radio-frequency power that radio-frequency power output module 4 exports could be arrived effectively after must first passing through switch matching module 3
Up to radiation assembly.Switching matching module 3 is passive adjustable part, when impedance matching condition is bad and reaches system software sets
When threshold value, the Switch Control signal exported by control unit 6 is defeated to switch variable connector searching radio-frequency power output module 4
The best match state of outlet, its role is to compensate because of 9 type of food, size, position, shape and temperature it is different and caused by
Resistance difference realizes the variation of whole-process automatic compensation food 9.What is searched out with switching is best with 9 impedance matching of food
The matching of state, herein referred to as electric tuning.
Switch matching module 3 is an inductive type matching network, includes fixed inductance part and adjustable inductance part.
There are multiple switches controlled by control unit 6 in controllable impedance part, one controlled inductance of corresponding parallel connection on each switch, this
The topological structure of the state or change circuit whether the access that can determine these controlled inductances with closure is switched on a bit；Together
There are also several fixed inductances in Shi Kaiguan matching module 3, they do not have and switch in parallel, i.e., the control of uncontrolled unit 6,
These fixed inductances can play the role of share current or voltage.
3 concrete methods of realizing of switch matching module of the utility model is as shown in Figure 6 to 8, and Fig. 6 and Fig. 7 are two kinds and have
The matching implementation of effect, port 1 connect the output end of measuring unit, and port 2 connects the power feed inputs of radiating element 11.With top
The it is proposed of formula primarily to realize that matching requires, while providing two kinds to those skilled in the art in a most simple approach
With scheme, facilitate the layout and wiring of hard circuit board.Can illustrate below, it is convenient those skilled in the art understand that.Although
Both matched specific implementations of this described in the text, but the implementation of the utility model opening up of being not limited to be shown
It rushes the net network.
Embodiment one, in Fig. 6, one in parallel first of 1 one end of port is followed by by fixed inductance L1 and variable inductance L2 series connection
First bypass on ground；Connect a fixed inductance L3 between port 1 and node 1；Parallel connection one is by fixed inductance on node 1
The second bypass being grounded after L4 and variable inductance L6 series connection；Connect a fixed inductance L5 between node 1 and port 2.It is fixed
Inductance L1 and fixed inductance L4 respectively defines the inductance minimum value of the first bypass and the second bypass, prevents the first bypass and second
Bypass causes the total reflection of RF energy because being directly grounded short circuit, causes RF energy that cannot be effectively passed to 2 rear end of port
Radiating element 11.
Embodiment two, in Fig. 7, one in parallel first of 1 one end of port is followed by by fixed inductance L1 and variable inductance L2 series connection
First bypass on ground；Connect a controllable impedance L3 between port 1 and node 2；Parallel connection one is by fixed inductance on node 2
Second bypass of L14 ground connection；Connect a fixed inductance L5 between node 2 and port 2.Equally, fixed inductance L1 is defined
The inductance minimum value of first bypass, prevents the first bypass from causing the total reflection of RF energy because being directly grounded short circuit, causes to penetrate
Frequency energy cannot be effectively passed to the radiating element 11 of 2 rear end of port.
Fig. 8 is the tool of the controllable impedance L2, controllable impedance L3 and controllable impedance L6 of controllable impedance part in Fig. 6 or Fig. 7
Body implementation.Controllable impedance is connected in series by several inductance are ascending, on each inductance it is in parallel one by
Control unit 6 controls the switch being turned on or off, and power module 5 can provide stable voltage for these switches, this is practical new
The switch of type concretely high-power relay.When some is closed the switch, the inductance of corresponding parallel connection therewith is switched on and off
Short circuit, in the non-access circuit of inductance；Conversely, when some switch is opened, in the inductance access circuit of corresponding parallel connection therewith.
Switch on the size with closure control inductance access.In order to make the access of inductance at controllable linear trend, these
The size of inductance, which can be set to, to be increased with twice or so of relationship at equal proportion, and the smallest inductance determines the smallest adjustment step
Long, the quantity of quantity or switch that inductance accesses determines the maximum value of entire controllable impedance.
Basic circuit topological structure is to be concatenated by two L-type inductance matching networks in Fig. 6 and Fig. 7.But it is solid
The position for determining inductance part and controllable impedance part is distinct, and corresponding mechanism is as described below.
Port 1 connects the output end of measuring unit, i.e., first bypasses close to radio-frequency power output module 4, the voltage phase of port 1
To minimum serial inductance L1 that is lower, bypassing by control first, the current maxima in bypass can be efficiently controlled, thus
First bypass can reduce the proof voltage of switching device and the index request of electric current as controllable impedance part, easy to accomplish.First
Bypass is mainly used to adjust matched fine or not degree, i.e. S11Amplitude size.The input of 11 input terminal of port 2 and radiating element hinders
Anti- capacitive reactance is smaller, and resistance is bigger, and the inductance value of the first bypass access is then bigger；Conversely, the inductance value of access is minimum.
Port 2 connects the feed end for the radiating element 11 being mounted on inside metal cavity, in the corresponding input impedance of feed end
Series resistance very little or parallel resistance it is very big, i.e., the Q value inside cavity is very big.Lead to the voltage and current of port 2 very
Greatly.Inductance L5 is directly connected with the input terminal of radiating element 11, needs to bear biggish electric current, is not suitable as controllable impedance portion
Point.Electric current on inductance L5 is the electric current phasor summation on electric current and the second bypass on inductance L3, the corresponding electricity of the second bypass
Sense and inductance L3 can be used as controllable impedance.
Concatenated inductance L3 is fixed inductance between Fig. 6 middle port 1 and node 1, and corresponding the second bypass is controllable impedance.
Since the second bypass is that radiating element 11 leans on closer with port 2, the second bypass is mainly used to adjust S11The offset of resonance frequency.
Such as returning to matching frequency point within the scope of 40.6MHz~40.70MHz, controllable impedance L6 becomes larger, S11Resonance
Frequency is deviated to lower frequency direction；Conversely, controllable impedance L6 becomes smaller, S11Resonance frequency is deviated to higher frequency direction.
Inductance L4 can efficiently control the current maxima in bypass, reduce the proof voltage of switching device and the index request of electric current.Fig. 6
In the first bypass and the second bypass division of labor it is clear, the first bypass is used to adjust S11Amplitude size, second bypass be used to adjust
S11The offset of resonance frequency.Inductance L2 and inductance L6 has 4 to 7 controlled inductances or switch, inductance L2 and electricity under normal circumstances
The range of L6 is felt in 10nH to 800nH or so, and size input impedance corresponding to feed end is related.The model of inductance L4 and inductance L5
It is trapped among 200nH to 500nH or so, the range of inductance L3 is in 400nH to 800nH or so, and inductance L1 is in 80nH to 150nH or so.
Concatenated inductance L3 is controllable impedance between Fig. 7 middle port 1 and node 2, and the corresponding inductance L4 of the second bypass is
Fixed inductance, controllable impedance L3 are that radio-frequency power output module 4 and the first bypass are leaned on closer with port 1.It is different from Fig. 6
It is that controllable impedance L2 and controllable impedance L3 can influence S simultaneously11Amplitude size and S11The offset of resonance frequency.Inductance L2 in this way
Controlled inductance perhaps number of switches can be reduced to the controlled inductance of 2 to 5 inductance L3 or number of switches is 4 to 7.
It has been investigated that the weight and temperature (dielectric constant for influencing food 9) of food 9 are to 11 input terminal of radiating element
Impedance influences are maximum, and the temperature of the food more than 9 or food 9 put in defrosting chamber is higher (being no more than 0 DEG C), corresponding capacitive reactance
Smaller, resistance is bigger；When unloaded, corresponding capacitive reactance is maximum, and resistance is minimum.Controllable impedance L6 or controllable impedance can thus be used
L3 and electric frequency modulation best match frequency estimate whether defrosting chamber is in unloaded or full load condition.For example, when adjustable
Inductance L6 or controllable impedance L3 is maximum, and when matching frequency is minimum, defrosting chamber can correspond to light condition, controllable impedance L6 or
Controllable impedance L3 is minimum, and when matching frequency highest, defrosting chamber can correspond to full load condition.
Radio frequency power output in radio-frequency power output module 4 has certain frequency adjustment range, such as 40.66MHz~
40.70MHz, output frequency are controlled by control unit 6.Fig. 9 is the electric frequency modulation basic flow chart of the utility model thawing apparatus, electricity
Keep the frequency of radio-frequency power output module constant during tuning switching switch, default original frequency is 40.68MHz.Electricity
Frequency modulation matching generally carries out after best match is found in electric tuning, the specific steps are as follows:
Step 1: the switch state after keeping electric tuning matching is constant, records currently scattered color parameter S11Amplitude size S0；
Step 2: the output frequency of adjustment radio-frequency power output module 4, electricity adjust frequency step about in 5KHz to 10KHz
The S of original frequency or so two nearest Frequency points (such as 40.675MHz and 40.685MHz) is read in left and right11Amplitude size SL、SR；
Step 3: compare S0、SLAnd SRNumerical values recited；
Step 4: if S0Minimum, optimum frequency point are original frequency 40.68MHz, complete electric frequency modulation matching；
Step 5: if SLOr SRMinimum, control unit control radio-frequency power output module and select S11That side to become smaller
Frequency direction, gradually frequency sweep；If S11Amplitude still gradually reducing, then continue to direction frequency sweep, if S11Amplitude start to increase
Greatly, then stop frequency sweep, S11That the smallest Frequency point is electric tuning best match frequency point, completes electric frequency modulation matching.
In electric frequency modulation matching process, controlled power source module can adjust and find the signal output frequency of best match.Make
For auxiliary matched, it mainly plays two aspects: 1. reduce compensation S11The number of switches of resonance frequency shift, i.e. adjustable electric
Feel the number of switches in L6 or controllable impedance L3, concrete thought is increased the case where not changing compensation range and precision
The matched minimum frequency shift amount of electric tuning, i.e. step-length, at this moment by continuous electric frequency modulation matching auxiliary, during preventing from crossing tuning
Cross the best match state of certain loads of food 9 (weight or temperature are different)；2. another effect is exactly to have widened food 9
Compensation range, if the food 9 to thaw is too many, controllable impedance L6 or controllable impedance L3 fall below it is minimum, at this moment can also electricity adjust
Frequency reduces frequency and is matched to 40.66MHz.Electric frequency modulation as auxiliary in a word, can promote the resolution ratio of tuning, and can open up
The compensation range of wide food 9, reduces the quantity of switch, to reduce cost.
Control unit 6 completes all status monitorings of system, data analysis, function control and the human-computer interaction of the interface UI, it
May include one or more for control processor, memory, display module 7, voice module, key module, communicate
Interface etc., is used for
1) condition monitoring passes through opening for the folding control microswitch of door body structure comprising 1. door body structure switch monitors
It closes, whether control signal moment monitoring microswitch is closed, if door body structure is opened, power supply is fail to open, and thaw routine can not
Operation；2. the radio-frequency measurement parameter fed back by measuring unit, the moment monitors the impedance state of feed port, it is ensured that radio-frequency power
The radio-frequency power that output module 4 exports can effectively be transmitted to radiating element 11.
2) data are analyzed, and acquire output frequency, forward and backward power and their difference of radio-frequency measurement module, thus
Scattered color parameter S is calculated11Amplitude and phase.Analysis obtain variety classes, temperature, shape, weight food 9 impedance shape
State.
3) function control controls the output of power supply by the power control signal that control unit 6 exports；Control unit 6 is defeated
The size of the grid voltage control each grid voltage of power amplification link out；The radiofrequency signal control that control unit 6 exports, control
The output state and frequency state in controllable signal source processed；The Switch Control Signal-controlled switch exported by control unit 6
The on-off etc. of 3 upper switch of matching module.
4) UI interactive module includes display module 7, key module, knob, voice module etc..For receiving user's input
Signal, user carries out function selection by key and knob, can also pass through remote monitoring module convenient monitoring etc. in real time.
Thawing apparatus in the utility model can also add some other accessory parts, radiating subassembly, temperature measurement component
Deng.Radiating subassembly includes fan 2, the air duct of rational design and the lower radiator structure part of some thermal resistances, to the electricity in system
Source module 5, radio-frequency power output module 4 and switch matching module 3 radiate.Temperature measurement component includes thermistor temperature detecting and red
Outer thermometric etc., thermistor temperature detecting are mainly needle primarily directed to power module 5 and radio-frequency power output module 4, infrared measurement of temperature
To the food materials that needs thaw, sends the temperature data measured to control unit 6 and be monitored and analyze, guarantee the reliable of system
Operation.
Figure 10 is the groundwork flow chart of thawing apparatus.The UI interactive module of control unit 6 can receive user's sending
Routine/quickly/sashimi/manual command, receive start thaw signal after, control unit 6 be arranged radio-frequency power export mould
The output frequency of block 4 is original frequency (such as 40.68MHz), controls power as low-power output, control switch matching module 3
Electric tuning matching is carried out, constantly switching matching status, while reading the 11 feed end S of radiating element that measuring unit measurement obtains11
Amplitude and phase, radio-frequency power output module 4 output and reflection power size, judge the quality of matching status, general S11
Value it is smaller, matching status is better.The purpose of small-power output is to prevent from high-power when matching status is bad causing device
Irreversible damage, but to guarantee that the detection accuracy power output of radio-frequency measurement module cannot be too small, the size and power amplifier of power
And the type selecting of switching device is related.It after best match is found in electric tuning, keeps switch state constant, carries out electric frequency modulation matching, electricity
It adjusts frequency step about in 5KHz to 10KHz or so, when electric frequency modulation matches, first reads original frequency or so two nearest frequencies
The S of point11Matching value, and compare their size, then towards S11That side frequency to become smaller increases or reduced direction,
Gradually frequency sweep, until finding S11That the smallest Frequency point completes electric frequency modulation.
After finding best match, whether device can analyze matching status abnormal, and it is bad that abnormal conditions show as matching status,
Such as S11Value be higher than -8dB.If matching status is abnormal, generally there are two kinds of situations, unloaded and failures.Unloaded corresponding switch
Switching state with module 3 is fixed, and under fault condition, switching epidemic situation comparison is random, and device readily identifies.
When matching status is normal, device can record the matching status of current switch, and improve radio frequency power output to thaw
Food 9.In course of defrosting, since the variation of 9 temperature of food will lead to the impedance variations that electricity adjusts radiation appliance input terminal, thus
The changed power for exporting radio-frequency power output module, such output power may be increased or be reduced very much, and device is likely to
High load capacity work or thawing time increase, thus timing is needed to maintain stable output power.If course of defrosting middle impedance becomes
Change the threshold value for causing the collocation degree detected to be higher than setting, device can reduce the output power of radio-frequency power output module, again
It need to be again by the defeated of radio-frequency power output module 4 before carrying out electric tuning matching into the search and Setting pattern of best match
Frequency is set as original frequency (such as 40.68MHz) out.
It also needs timing to store when defrosting and analyzes the radio frequency parameter during thawing, what radio frequency parameter here referred mainly to
It is the S of radio-frequency measurement module detection11Amplitude and phase information.To guarantee uniform quality that food 9 thaws, penetrate in course of defrosting
Frequency power output module output power also needs constantly to adjust.After the completion of defrosting, device can shutdown signal source, power supply and radio frequency function
Rate output module 4 simultaneously reminds user that defrosting is completed.
Whether thawing, it is related with the thawing mode that user selects to complete.When user selects manual thaw, system can be according to
Time set by user thaws, or the temperature of setting is thawed.The time set by user is reached when reaching defrosting timing
When the upper limit or the temperature for measuring food 9 have reached temperature upper limit set by user, thaws and complete.When user selects automatic thaw
When (conventional/quickly/sashimi), whether system can thaw according to the change rate automatic discrimination of the radio frequency parameter of acquisition is completed.It is solving
During jelly, since the variation of 9 temperature of food will lead to the feed end input impedance variation of radiating element 11, so as to cause measurement
S11It changes.But with the rising of temperature, the ice crystal state inside food 9 is gradually converted to flowing liquid, occurs big
Phase transformation situation is measured, under conditions of absorbing identical energy, temperature rise can gradually slow down food 9, S11The amplitude of variation can gradually decrease,
When especially 9 temperature of food is raised to -2 degrees Celsius to 0 degree Celsius of section, S11It is held essentially constant.Thus slowed down using temperature rise or
Person S11Variation slows down this characteristic, can determine whether the defrosting of food 9 is completed.It need to constantly be read when defrosting and store S11Width
Value and phase, and calculate S11Amplitude and phase variable quantity, if variable quantity it is stable to a certain extent when thaw complete.
Through overtesting, the discovery present invention is suitable defrosting sashimi (such as salmon, raw oyster etc.), and it is uniformly quick to be embodied in defrosting, can be very big
Reservation raw food material freshness and mouthfeel.
It is noted that device thawed foodstuff 9 has the time and temperature upper limit of default, if reaching the upper of this default
Limit, device can also stop thawing.
The technical solution of the utility model compared to the prior art " with lumped inductance formula matching network thawing equipment and
Its operating method " (application publication number: CN107684007A), it has the advantage that
1, the difference of matching way
The prior art realizes matching by the way of controlling impedance matching network switch state by controller.This reality
It is proposed after electric tuning matches with novel using the matched mode of electric frequency modulation, there is extraordinary advantage in this way:
1) compensation S is reduced11The number of switches of resonance frequency shift, while matched resolution ratio can also be promoted, it is specific to think
Road is to increase the matched minimum frequency shift amount of electric tuning, i.e. step-length the case where not changing compensation range, does not increase electric frequency modulation matching
When, the step-length of switched tuning is about 90KHz, and step-length is at this moment increased 40KHz by continuous electric frequency modulation matching, can be subtracted in this way
The quantity of several few switches, while the step-length of frequency modulation can greatly improve the matched resolution of electric tuning with very little such as 5KHz
Rate promotes defrosting efficiency to find optimal matching status.
2) another effect is exactly the compensation range for having widened food, that is, enables a system to the heavier or lighter food that thaws
Object.
After generally speaking matching plus electric frequency modulation, the resolution ratio of tuning can be promoted, and the compensation range of food can be widened,
The quantity for reducing switch, to reduce cost.
2, the difference of match circuit
The prior art uses the inductance match circuit that L-type adds π type.The utility model uses the inductance that L-type adds L-type
With circuit, there is the advantage of highly significant in this way:
1) it from topological structure, more simply, implements more convenient.
2) it functionally sees, is both to realize matching feature, but effect has marked difference.If the range of thawed foodstuff is equal
For 0.1Kg to 2Kg, L-type adds the range of the controllable impedance of the separate radio frequency source of pi-network are as follows: 160nH-1429nH, and L-type
Add the range of the controllable impedance of the separate radio frequency source of L-type circuit are as follows: 160nH-305nH.It can be seen that guaranteeing identical step-length
In the case where, L-type adds the number of switches of L-type circuit that can reduce accordingly；Two circuits, can in the case where Same Efficieney simultaneously
Adjust the electric current difference on inductive branch smaller, inductance is bigger, and the voltage for switching receiving is also required to increase, thus L-type adds L-type circuit
The index request of switch also will be greatly reduced, very big help is played for thawing apparatus is realized with a low cost.
3) also controllable impedance branch has been changed between rf inputs and intermediate node concatenated electricity in the utility model
Sense, such as the inductance L3 in Fig. 7, it is such be advantageous in that do not change matching range under the premise of, controllable impedance L3 and controllable impedance
L2 energy phase mutual active influence plays the role of the inductance value range for being reduction controllable impedance L2 that can be very big, that is, reduces
The quantity of controllable impedance L2 switch.
In short, adding L-type match circuit using the L-type of the utility model, the quantity and property of switching device can be greatly reduced
The requirement of energy, has fabulous improvement using safe and service life etc. to thawing apparatus.
Specific embodiment of the utility model is described above.It is to be appreciated that the utility model not office
It is 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 has no effect on the substantive content of the utility model.In the absence of conflict, the spy in embodiments herein and embodiment
Sign can be arbitrarily combined with each other.
Claims (13)
1. a kind of switch matching module characterized by comprising
Inductance L3, one end of the inductance L3 are connect with power take-off；
Inductance L5, one end of the inductance L5 are connect with the other end of the inductance L3；
One end of first bypass, first bypass is connect with the power take-off, the other end ground connection of first bypass；
One end of second bypass, second bypass is connect with the other end of the inductance L3, the other end of second bypass
Ground connection.
2. switch matching module according to claim 1, which is characterized in that it is described first bypass include:
Inductance L1, one end of the inductance L1 are connect with the power take-off；
Inductance L2, one end of the inductance L2 are connect with the other end of the inductance L1, the other end ground connection of the inductance L2.
3. switch matching module according to claim 2, which is characterized in that it is described second bypass include:
Inductance L4, one end of the inductance L4 are connect with the other end of the inductance L3, the other end ground connection of the inductance L4.
4. switch matching module according to claim 2, which is characterized in that it is described second bypass include:
Inductance L4, one end of the inductance L4 are connect with the other end of the inductance L3；
Inductance L6, one end of the inductance L6 are connect with the other end of the inductance L4, the other end ground connection of the inductance L6.
5. switch matching module according to claim 3, which is characterized in that the inductance L3 is controllable impedance；
The inductance L5 is fixed inductance；
The inductance L1 is fixed inductance；
The inductance L2 is controllable impedance；
The inductance L4 is fixed inductance.
6. switch matching module according to claim 4, which is characterized in that the inductance L3 is fixed inductance；
The inductance L5 is fixed inductance；
The inductance L1 is fixed inductance；
The inductance L2 is controllable impedance；
The inductance L4 is fixed inductance；
The inductance L6 is controllable impedance.
7. a kind of thawing apparatus, which is characterized in that include at least:
Defrosting cavity, the defrosting cavity needs are or comprising metal material, operating room are equipped in the defrosting cavity；
Control unit, described control unit are arranged on the defrosting cavity；
Radio-frequency power output module, the radio-frequency power output module are arranged on the defrosting cavity, and the radio-frequency power is defeated
Module is communicated with described control unit out；
Measuring unit, the measuring unit are connect with described control unit and the radio-frequency power output module respectively；
Matching module is switched, the switch matching module is connect with described control unit and the measuring unit respectively, by cutting
The switching device changed in the switch matching module can find the best of the radio-frequency power output module output end impedance matching
State；
Power module, the power module respectively with described control unit, the radio-frequency power output module and it is described switch
It is connected with module；
Mechanism is radiated, the radiation mechanism is connect with the switch matching module, and the radiation mechanism is arranged in the operating room
Lower section；Wherein
The switch matching module is switch matching module described in claim 1 to 6 any one.
8. thawing apparatus according to claim 7, which is characterized in that the radiation mechanism includes:
The lower section of the operating room is non-contactly arranged in radiating element, the radiating element；
Feed element, the feed element connect the radiating element and the switch matching module.
9. thawing apparatus according to claim 7, which is characterized in that the power module includes:
Adjustable voltage part, fixed voltage part and the control interface communicated with described control unit.
10. thawing apparatus according to claim 8, which is characterized in that the radiating element is metal decking, metal grill
Or metal folding part.
11. thawing apparatus according to claim 7, which is characterized in that the initial output of the radio-frequency power output module
Frequency is 40.68MHz, and the step-length of adjustment is 5KHz~10KHz, and the defrosting frequency of best match can be found by scan frequency
Point.
12. thawing apparatus according to claim 7, which is characterized in that matched by the switch after initially adjusting matching
The Frequency point of the best match of the switching state of module and the radio-frequency power output module determines that defrosting chamber is in sky
The state for carrying or being fully loaded with.
13. thawing apparatus according to claim 7 or 11, which is characterized in that export mould by detecting the radio-frequency power
Block output end dissipates color parameter S11Amplitude and phase change rate degree of stability differentiate thaw whether complete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821792505.6U CN209251648U (en) | 2018-11-01 | 2018-11-01 | A kind of thawing apparatus using switch matching module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821792505.6U CN209251648U (en) | 2018-11-01 | 2018-11-01 | A kind of thawing apparatus using switch matching module |
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| Publication Number | Publication Date |
|---|---|
| CN209251648U true CN209251648U (en) | 2019-08-16 |
Family
ID=67559563
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821792505.6U Withdrawn - After Issue CN209251648U (en) | 2018-11-01 | 2018-11-01 | A kind of thawing apparatus using switch matching module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109221882A (en) * | 2018-11-01 | 2019-01-18 | 上海点为智能科技有限责任公司 | Switch matching module and the thawing apparatus using the switch matching module |
| CN109257025A (en) * | 2018-11-01 | 2019-01-22 | 上海点为智能科技有限责任公司 | Switch matching module, thawing apparatus and automatic defreezing method |
| CN113099569A (en) * | 2020-01-08 | 2021-07-09 | 青岛海尔电冰箱有限公司 | Control method for heating device and heating device |
-
2018
- 2018-11-01 CN CN201821792505.6U patent/CN209251648U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109221882A (en) * | 2018-11-01 | 2019-01-18 | 上海点为智能科技有限责任公司 | Switch matching module and the thawing apparatus using the switch matching module |
| CN109257025A (en) * | 2018-11-01 | 2019-01-22 | 上海点为智能科技有限责任公司 | Switch matching module, thawing apparatus and automatic defreezing method |
| CN109221882B (en) * | 2018-11-01 | 2024-05-07 | 上海点为智能科技有限责任公司 | Switch matching module and defrosting device using same |
| CN113099569A (en) * | 2020-01-08 | 2021-07-09 | 青岛海尔电冰箱有限公司 | Control method for heating device and heating device |
| CN113099569B (en) * | 2020-01-08 | 2022-06-24 | 青岛海尔电冰箱有限公司 | Control method for heating device and heating device |
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