CN113915935B - Thawing refrigerator and control method thereof - Google Patents

Thawing refrigerator and control method thereof Download PDF

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Publication number
CN113915935B
CN113915935B CN202110135731.7A CN202110135731A CN113915935B CN 113915935 B CN113915935 B CN 113915935B CN 202110135731 A CN202110135731 A CN 202110135731A CN 113915935 B CN113915935 B CN 113915935B
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thawing
food material
impedance
current food
value
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CN113915935A (en
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赵强
段跃斌
李秀军
侯同尧
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Hisense Refrigerator Co Ltd
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Hisense Refrigerator Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/12—Arrangements of compartments additional to cooling compartments; Combinations of refrigerators with other equipment, e.g. stove
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/005—Mounting of control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2600/00—Control issues
    • F25D2600/06—Controlling according to a predetermined profile
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/14—Sensors measuring the temperature outside the refrigerator or freezer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
    • Y02A40/963—Off-grid food refrigeration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
    • Y02P60/85—Food storage or conservation, e.g. cooling or drying

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Nutrition Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Electric Ovens (AREA)
  • Transmitters (AREA)

Abstract

The invention discloses a defrosting refrigerator, which comprises: the storage cavity is used for storing food materials; the signal source output module outputs a radio frequency signal with fixed frequency to the current food material; a power amplifier that amplifies a radio frequency signal; the tuner comprises a signal detection module and an impedance matching module, wherein the signal detection module is used for detecting a reflected signal reflected by the current food material after receiving a radio frequency signal, and the impedance matching module is used for matching the impedance of the load and the power amplifier; the controller is configured to: adjusting the radio frequency signal output by the signal source output module according to the reflected signal; acquiring food material information of the current food material, and acquiring a thawing parameter change trend corresponding to the current food material pre-stored in a database according to the food material information; and setting the thawing time of the current food material according to the variation trend of the thawing parameters. The invention also discloses a control method of the thawing refrigerator, and by adopting the embodiment of the invention, food materials can be thawed according to the food material information, and the thawing efficiency of the food materials is improved.

Description

Thawing refrigerator and control method thereof
Technical Field
The invention relates to the technical field of refrigerators, in particular to a thawing refrigerator and a control method thereof.
Background
In recent years, with the rapid development of eating habits and life rhythms, the market demand of frozen foods for rapid thawing is found to be stronger in the investigation of consumer demand in the household electrical industry, and refrigerators are used as direct media for food storage and freezing, and are endowed with the desire of thawing functions by consumers. The traditional thawing modes comprise natural thawing, water soaking thawing, refrigerator refrigerating thawing and the like, but the thawing modes still have the problems of long time consumption, easiness in bacteria breeding and the like. The radio frequency thawing system can accelerate thawing speed, but in practical application, the radio frequency thawing system can only judge thawing state according to reflected signals, and can not recognize food information, so that different food thawing effect differences are larger.
Disclosure of Invention
The embodiment of the invention aims to provide a thawing refrigerator and a control method thereof, which can defrost food according to food information and improve thawing efficiency of the food.
To achieve the above object, an embodiment of the present invention provides a defrosting refrigerator, including:
the storage cavity is used for storing food materials;
the signal source output module outputs a radio frequency signal with fixed frequency to the current food material;
a power amplifier that amplifies the radio frequency signal;
the tuner comprises a signal detection module and an impedance matching module, wherein the signal detection module is used for detecting a reflected signal reflected by the current food material after receiving the radio frequency signal, and the impedance matching module is used for matching the impedance of a load and the power amplifier;
the controller is configured to:
adjusting the radio frequency signal output by the signal source output module according to the reflected signal;
acquiring food material information of a current food material, and acquiring a thawing parameter change trend corresponding to the current food material in a pre-stored database according to the food material information; wherein the thawing parameter variation trend comprises at least one of food parameter variation trend, impedance variation trend and thawing time limit range;
and adjusting the thawing time of the current food material according to the thawing parameter variation trend.
As an improvement of the above, the controller is further configured to:
thawing the current food material according to the thawing time;
when the thawing stopping condition is reached, judging whether the lower limit value of the thawing experience value corresponding to the current food material is reached;
if yes, stopping thawing; if not, stopping thawing until reaching the lower limit value of the thawing experience value.
As an improvement of the above, the controller is further configured to:
when the thawing stopping condition is not reached, judging whether the upper limit value of the thawing experience value corresponding to the current food material is reached or not;
if yes, stopping thawing; if not, continuing thawing.
As an improvement of the above, the tuner is further configured to:
setting initial impedance of the impedance matching module according to food material information of the current food material;
and adjusting the impedance of the impedance matching module according to the reflected signal.
As an improvement of the above, the tuner is further configured to:
when the reflected signal distortion is detected, calculating a matching impedance value;
judging whether the difference value between the matching impedance value and the characteristic experience value of the current food material is within a preset error range or not; the characteristic experience value is preset, and a corresponding characteristic experience value can be obtained according to the food material information of the current food material;
if yes, adjusting the impedance of the impedance matching module according to the matching impedance value; if not, the impedance of the impedance matching module is adjusted according to the characteristic experience value.
As an improvement of the above-described aspect, the food material information includes at least one of a kind, a quality, an initial temperature, and a dielectric constant of the current food material.
As an improvement of the above, the controller is further configured to:
and sending out corresponding prompt information according to the thawing time.
In order to achieve the above object, an embodiment of the present invention further provides a method for controlling a thawing refrigerator, including:
outputting a radio frequency signal with fixed frequency to the current food material; amplifying the radio frequency signal through a power amplifier;
controlling a signal detection module in the tuner to detect a reflected signal reflected by the current food after receiving the radio frequency signal, and controlling an impedance matching module in the tuner to match the impedance of the load and the power amplifier;
adjusting the radio frequency signal output by the signal source output module according to the reflected signal;
acquiring food material information of a current food material, and acquiring a thawing parameter change trend corresponding to the current food material in a pre-stored database according to the food material information; wherein the thawing parameter variation trend comprises at least one of food parameter variation trend, impedance variation trend and thawing time limit range;
and adjusting the thawing time of the current food material according to the thawing parameter variation trend.
As an improvement of the above solution, the method further includes:
thawing the current food material according to the thawing time;
when the thawing stopping condition is reached, judging whether the lower limit value of the thawing experience value corresponding to the current food material is reached;
if yes, stopping thawing; if not, stopping thawing until reaching the lower limit value of the thawing experience value;
when the thawing stopping condition is not reached, judging whether the upper limit value of the thawing experience value corresponding to the current food material is reached or not;
if yes, stopping thawing; if not, continuing thawing.
As an improvement of the above solution, the method further includes:
setting initial impedance of the impedance matching module according to food material information of the current food material;
adjusting the impedance of the impedance matching module according to the reflected signal;
when the reflected signal distortion is detected, calculating a matching impedance value;
judging whether the difference value between the matching impedance value and the characteristic experience value of the current food material is within a preset error range or not; the characteristic experience value is preset, and a corresponding characteristic experience value can be obtained according to the food material information of the current food material;
if yes, adjusting the impedance of the impedance matching module according to the matching impedance value; if not, the impedance of the impedance matching module is adjusted according to the characteristic experience value.
Compared with the prior art, the thawing refrigerator and the control method thereof disclosed by the embodiment of the invention detect the reflected signal of the current food material reflected after receiving the radio frequency signal, regulate the radio frequency signal output by the signal source output module through the reflected signal, and thaw the current food material by the output radio frequency signal. In addition, by acquiring food material information of the current food material and acquiring a variation trend of the thawing parameter corresponding to the current food material pre-stored in the database according to the food material information, the thawing time of the current food material can be adjusted according to the variation trend of the thawing parameter, the food material can be thawed according to the food material information, and the thawing efficiency of the food material is improved.
Drawings
Fig. 1 is a block diagram of a defrosting refrigerator according to an embodiment of the present invention;
fig. 2 is a block diagram of another defrosting refrigerator according to an embodiment of the present invention;
FIG. 3 is a thawing flow chart of a thawing process according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for controlling a defrosting refrigerator according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Meat/fish and other food materials are composed of molecules and ions, when an external electric field is applied, polar molecule rotation and ion movement can occur, the electric field between the polar plates of the radio frequency cavity body is continuously changed, the polar molecule rotation and the ion movement to the polar plates are caused, and particle collision and friction can occur in the process, so that the temperature of the frozen food materials is increased. The dielectric constant of the frozen food material is an important parameter for representing the influence degree of the radio frequency electric field on the food material, and mainly comprises a relative dielectric constant epsilon ', a relative dielectric loss constant epsilon ' which represents the charge storage capacity of the food material, and the epsilon ' represents the electric energy consumption capacity of the food material, wherein the expression is as follows:
epsilon = epsilon' +j epsilon "formula (1);
the dielectric constant of the food material is related to factors such as temperature, water content, composition and frequency. The higher the moisture content, the more ions and polar molecules in the tissue, the more susceptible the food material is to the electric field, and the greater the dielectric constant. The temperature and frequency have complex influence on dielectric constant. It should be noted that, the dielectric constant of the meat food material is generally changed most at-5 ℃ to-1 ℃, which correspondingly causes larger displacement current change, and in practical application, the current dielectric constant of the food material can be determined by detecting the current change condition.
Illustratively, the thawing time is shown in table 1, the thawing effect is shown in table 2 after the thawing time is prolonged, and the thawing effect is shown in table 3 after the thawing time is shortened.
TABLE 1 automatic thawing effects of different food materials
Figure BDA0002926873250000051
TABLE 2 Effect of different food materials on prolonging thawing time
Figure BDA0002926873250000052
Figure BDA0002926873250000061
TABLE 3 Effect of different food materials on shortening thawing time
Figure BDA0002926873250000062
In the process of thawing the food material by radio frequency, after the electromagnetic wave enters the food material, the electromagnetic wave is continuously absorbed, and simultaneously, the refraction and reflection phenomena of the electromagnetic wave can occur at the junctions of different media, so that the electromagnetic wave is continuously attenuated, and when the electromagnetic wave intensity is attenuated to 1/e of the surface intensity (e=2.71828), the penetration depth is the thickness of the food material, and the formula is as follows:
Figure BDA0002926873250000063
wherein c is the speed of light, d p The wave intensity of the electromagnetic wave can be the wave intensity of the electromagnetic wave, and the depth of the electromagnetic wave penetrating through the food material is proportional to the wavelength of the electromagnetic wave from the formula (2).
The temperature distribution of the food material after thawing is related to the penetration depth on the one hand and to the thermal conductivity of the food material itself on the other hand, the thermal conductivity being generally expressed by the heat flux density q:
Figure BDA0002926873250000064
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure BDA0002926873250000065
for temperature gradients, k is the thermal conductivity, where thermal conductivity is primarily related to temperature and food material properties.
In addition, the thawing effect of the food materials is affected by factors such as equipment (such as plate spacing), environment (such as temperature and humidity) and the like.
Referring to fig. 1, fig. 1 is a block diagram of a thawing refrigerator 100 according to an embodiment of the present invention, the thawing refrigerator 100 is composed of a storage chamber 10, a signal source output module 20, a power amplifier 30, a tuner 40, and a controller 50, wherein;
the storage cavity 10 is used for placing food materials;
the signal source output module 20 outputs a radio frequency signal with a fixed frequency to the current food;
the power amplifier 30 amplifying the radio frequency signal;
the tuner 40 includes a signal detection module and an impedance matching module, the signal detection module is configured to detect a reflected signal reflected by the current food material after receiving the radio frequency signal, and the impedance matching module is configured to match impedance of the load and the power amplifier 30;
the controller 50 is configured to:
adjusting the radio frequency signal output by the signal source output module according to the reflected signal;
acquiring food material information of a current food material, and acquiring a thawing parameter change trend corresponding to the current food material in a pre-stored database according to the food material information; wherein the thawing parameter variation trend comprises at least one of food parameter variation trend, impedance variation trend and thawing time limit range;
and adjusting the thawing time of the current food material according to the thawing parameter variation trend.
Specifically, the signal source output module 20 is a source for generating a radio frequency signal, and is capable of outputting a radio frequency signal with a fixed frequency, and the radio frequency signal is amplified step by the power amplifier 30 and then outputted to a load (i.e. food material placed in the storage cavity 10). The tuner 40 serves to match the impedance of the load and the power amplifier 30, and by means of automatic impedance matching, power is output to the load as much as possible, preventing power reflections in the system. The tuner 40 includes a power detection circuit and an impedance matching circuit, which can detect the rf signal at the load end in real time and transmit information to the controller 50, and the controller 50 adjusts the impedance matching circuit and the output frequency according to the detection result, thereby ensuring stable transmission of rf power.
Specifically, the food material information includes at least one of a kind, a quality, an initial temperature, and a dielectric constant of a current food material. The thawing refrigerator is provided with a touch display screen, a user can identify and manage food materials of the refrigerator through radio frequency identification, video identification, manual input, voice input and the like, and when the user takes food materials out of a freezing area of the refrigerator and puts the food materials into a thawing cavity, corresponding food material information is updated into the controller 50, and food material information confirmation can be carried out through modes of tag identification, language input and the like.
When the controller 50 obtains the food material information, key information such as food material parameter variation trend, impedance variation trend, thawing time limit range and the like can be searched in a database according to factors such as food material category, quality, initial temperature state and the like, so as to optimize the thawing process. It is worth to say that, the database is pre-stored with thawing information of various historical food materials, after identifying food material information of the current food materials, corresponding parameters are searched in the database, and thawing time is optimized according to the parameters. The input power efficiency is low due to the fact that impedance matching is not accurate caused by external interference or internal faults, the thawing system is serious in heating and food cannot be thawed effectively, thawing time can be controlled, and the phenomenon that thawing is not stopped due to factors such as faults or errors of a detection circuit is prevented.
Further, referring to fig. 2, the thawing refrigerator 100 further includes a power module 60, the commercial power is changed into low-voltage direct current through the power module 60 to be supplied to the power amplifier 30, and is outputted to the load in the storage cavity 10 for heating through three-stage amplification, and the tuner 40 is an important component of the rf heating system, and performs a function of maximizing power transmission.
Optionally, the tuner 40 is further configured to:
setting initial impedance of the impedance matching module according to food material information of the current food material;
adjusting the impedance of the impedance matching module according to the reflected signal;
when the reflected signal distortion is detected, calculating a matching impedance value;
judging whether the difference value between the matching impedance value and the characteristic experience value of the current food material is within a preset error range or not; the characteristic experience value is preset, and a corresponding characteristic experience value can be obtained according to the food material information of the current food material;
if yes, adjusting the impedance of the impedance matching module according to the matching impedance value; if not, the impedance of the impedance matching module is adjusted according to the characteristic experience value.
Specifically, the radio frequency thawing control system of the refrigerator can adjust an initial impedance value according to information of food materials, extract characteristic experience values of impedance change in a thawing process of the food materials, and the extracted characteristic experience values are used for judging whether the whole impedance matching system works normally or not, and ensure that the radio frequency system can still maintain working when detecting system faults under the conditions of external interference or internal faults. When the distortion of the reflected signal is detected, automatically calculating a matched impedance value, simultaneously comparing the calculated value with the extracted characteristic experience value, outputting according to the actually calculated matched impedance value if the error is within an allowable range, adjusting the optimal impedance, outputting according to the characteristic experience value if the error is beyond the allowable range of the experience value, and enabling the impedance matching module to match the impedance of the load and the power amplifier according to the adjusted impedance by adjusting the impedance of the impedance matching module. The impedance output is calculated according to the actual optimum, and the phenomenon that the regulated value and the actual value are seriously not matched due to detection or calculation, the system energy is greatly consumed by heating, and the thawed food cannot be thawed normally is prevented.
It is worth to say that the characteristic experience value can be obtained in advance through modeling, tests are conducted under different states of different kinds of food materials, an experience thawing time range is obtained, for example, 1KG pork is thawed from-20 ℃, about 18MIN is needed, the experience value range is obtained through multiple measurement of pork with different fat-lean proportions and shapes, for example, within 13 to 25 minutes, 1KG is actually thawed at-20 ℃, the whole automatic thawing process is limited by the experience value, and the system is considered to be faulty if the range is not reached or exceeded.
Illustratively, the process of calculating the matching impedance value is as follows:
the power supply terminal impedance is expressed as:
Z s ＝R S +jX s formula (4);
wherein R is S Representing the resistance value of the power supply end;
the load-side impedance is expressed as:
Z L ＝R L +jX L equation (5);
wherein R is L Representing the resistance value of the load end;
the reflection coefficient is known according to the transmission line theory:
Figure BDA0002926873250000091
Figure BDA0002926873250000092
γ S ＝Γ S 2 equation (8);
γ L ＝Γ L 2 equation (9);
wherein Γ is S Is a reflection system of power supply voltage Γ L Is the reflection coefficient of load voltage, gamma S Power reflection coefficient gamma corresponding to power supply voltage L For the power reflection coefficient corresponding to the load voltage, Z O Is the characteristic impedance of the transmission line.
If the impedances of the power amplifier 40 and the load are not matched, the reflection coefficient is not 0, which results in reflection of a part of the transmission signal along the transmission line, which not only causes power loss, but also affects the subsequent signal transmission. The reflection coefficient is not 0, the signal is distorted, the load parameter is seriously unmatched with the system parameter, most of energy of the power supply can be heated and consumed in components in the circuit at this time, food can not be effectively penetrated and thawed through radio frequency signals, the reflection coefficient is 0, the impedance matching is adjusted according to load change in practical application, but the impedance matching is a dynamic process, the adjustment is also accurate and influenced by a plurality of factors, the adjustment is only carried out according to theoretical impedance matching, an error range exists in the practical adjustment process, and the fact that the energy is thawed in a certain efficiency range is guaranteed, namely the system parameter is considered to be matched.
To ensure that the load end obtains the maximum power, the reflected signal needs to be eliminated, and the voltage of the load end can be expressed as follows:
Figure BDA0002926873250000101
the load side power may represent:
Figure BDA0002926873250000102
from the principle of maximum power, X S ＝-X L Meanwhile, partial differential calculation can be carried out on the formula:
Figure BDA0002926873250000103
thus it is known that when Z S ＝Z L * The transmission effect is optimal when, Z L * Is Z L Is a complex conjugate of (a) and (b).
In the process of radio frequency thawing, the food load is increased along with the temperature, and the material property is changed in real time, so that the reflection coefficient is also changed in real time, and therefore, the system is required to be capable of automatically matching the load, detecting the power in real time and reducing the reflection loss.
Further, referring to fig. 3, the controller 50 is further configured to:
thawing the current food material according to the thawing time;
when the thawing stopping condition is reached, judging whether the lower limit value of the thawing experience value corresponding to the current food material is reached;
if yes, stopping thawing; if not, stopping thawing until reaching the lower limit value of the thawing experience value;
when the thawing stopping condition is not reached, judging whether the upper limit value of the thawing experience value corresponding to the current food material is reached or not;
if yes, stopping thawing; if not, continuing thawing.
When the thawing system starts thawing, the thawed food materials are detected in real time according to the food material reflection signals, and when the thawing stop conditions are met, the thawing process of the thawing system is automatic at present, and the temperature of the food materials is extracted from the reflection signals by detecting the reflection signals (the characteristics that the food materials change obviously at about-2 ℃ and the dielectric constant is utilized) to serve as an automatic stop sign. However, in actual use, the reflected signal extracts the current temperature information of the food as a judgment, and is affected by various factors such as the type and state of the food, the external environment and the like, and the reliability is insufficient, so that the phenomena that the food is not thawed, the temperature of the food is too high after thawing, the thawing is not stopped after long-time running, and the food is not thawed are caused. According to the refrigerator with the food material management system function, when a user takes out to defrost food materials, food material information can be provided to the defrosting system in advance, the defrosting system can be used for extracting defrosting time experience ranges from experience libraries according to various food material information including food material types, weight, storage time, storage temperature and the like, comprehensive influence degree and the like, whether the defrosting process reaches defrosting stop conditions or not is detected in real time, if the defrosting stop conditions are not met, whether the current defrosting time exceeds the upper limit of the characteristic defrosting time experience value of the food materials is judged, if the current defrosting time reaches the upper limit, defrosting is stopped immediately, and if the upper limit of the experience value is not met, the detection and judgment are continued. When the thawing stop condition is reached, whether the lower limit value of the thawing time of the food material characteristics is reached or not is judged, if the lower limit value of the thawing time is reached, the thawing is judged to be incomplete, and the thawing is carried out according to the lower limit value of the thawing time experience.
According to the embodiment of the invention, by combining the refrigerator food material management function, the problems that the refrigerator thawing system is not defrosted after long-time operation due to disturbance imbalance of detection signals or detection system faults, namely the system power transmission efficiency is low, the thawing system is not defrosted due to heating waste, the thawing system is not stopped accurately and is not stopped automatically and the like can be effectively prevented, and the stability of the refrigerator thawing system is improved.
Still further, the controller 50 is further configured to:
and sending out corresponding prompt information according to the thawing time.
Illustratively, the thawing refrigerator 100 is provided with a sound playing device, and in the process of optimizing thawing, the thawing residual time is played at regular time, or the residual thawing time is correspondingly displayed in a display screen.
Compared with the prior art, the thawing refrigerator 100 disclosed by the embodiment of the invention detects the reflected signal of the current food material reflected after receiving the radio frequency signal, adjusts the radio frequency signal output by the signal source output module through the reflected signal, and the output radio frequency signal can thaw the current food material. In addition, by acquiring food material information of the current food material and acquiring a variation trend of the thawing parameter corresponding to the current food material pre-stored in the database according to the food material information, the thawing time of the current food material can be adjusted according to the variation trend of the thawing parameter, the food material can be thawed according to the food material information, and the thawing efficiency of the food material is improved.
Referring to fig. 4, fig. 4 is a flowchart of a defrosting refrigerator control method according to an embodiment of the present invention, the defrosting refrigerator control method includes:
s1, outputting a radio frequency signal with fixed frequency to a current food material; amplifying the radio frequency signal through a power amplifier;
s2, controlling a signal detection module in the tuner to detect a reflected signal reflected by the current food material after receiving the radio frequency signal, and controlling an impedance matching module in the tuner to match the impedance of a load and the power amplifier;
s3, adjusting the radio frequency signal output by the signal source output module according to the reflected signal;
s4, acquiring food material information of the current food material, and acquiring a thawing parameter change trend corresponding to the current food material, which is pre-stored in a database, according to the food material information; wherein the thawing parameter variation trend comprises at least one of food parameter variation trend, impedance variation trend and thawing time limit range;
s5, adjusting the thawing time of the current food material according to the thawing parameter change trend.
The control method of the defrosting refrigerator is implemented by a controller in the defrosting refrigerator, and the defrosting refrigerator comprises a storage cavity, a signal source output module, a power amplifier, a tuner and a controller.
Specifically, the signal source output module is a source for generating a radio frequency signal, and can output the radio frequency signal with a fixed frequency, and the radio frequency signal is amplified step by a power amplifier and then is output to a load (namely, food materials placed in the storage cavity). The tuner is used for matching the impedance of the load and the power amplifier, and the power is output to the load as much as possible through automatic impedance matching, so that the power reflection in the system is prevented. The tuner comprises a power detection circuit and an impedance matching circuit, can detect a load-end radio frequency signal in real time, and transmits information to the controller, and the controller can adjust the impedance matching circuit and the output frequency according to detection results, so that stable transmission of radio frequency power is ensured.
Specifically, the food material information includes at least one of a kind, a quality, an initial temperature, and a dielectric constant of a current food material. The refrigerator is characterized in that a touch display screen is arranged on the defrosting refrigerator, a user can identify and manage food materials of the refrigerator through radio frequency identification, video identification, manual input, voice input and the like, and when the user takes out food materials from a freezing area of the refrigerator and puts the food materials into the defrosting cavity, corresponding food material information is updated into the controller, and food material information confirmation can be carried out through modes of tag identification, language input and the like.
When the controller acquires the food material information, key information such as food material parameter change trend, impedance change trend, thawing time limit range and the like can be extracted in a database in a table look-up mode according to factors such as food material category, quality, initial temperature state and the like, and the key information is used for optimizing a thawing process. It is worth to say that, the database is pre-stored with thawing information of various historical food materials, after identifying food material information of the current food materials, corresponding parameters are searched in the database, and thawing time is optimized according to the parameters. The input power efficiency is low due to the fact that impedance matching is not accurate caused by external interference or internal faults, the thawing system is serious in heating and food cannot be thawed effectively, thawing time can be controlled, and the phenomenon that thawing is not stopped due to factors such as faults or errors of a detection circuit is prevented.
Optionally, the tuner is capable of impedance matching, in which case the method further comprises:
s21, setting initial impedance of the impedance matching module according to food material information of the current food material;
s22, adjusting the impedance of the impedance matching module according to the reflected signal;
s23, calculating a matching impedance value when the reflection signal distortion is detected;
s24, judging whether the difference value between the matched impedance value and the characteristic experience value of the current food material is within a preset error range; the characteristic experience value is preset, and a corresponding characteristic experience value can be obtained according to the food material information of the current food material;
s25, if yes, adjusting the impedance of the impedance matching module according to the matching impedance value; if not, the impedance of the impedance matching module is adjusted according to the characteristic experience value.
Specifically, the radio frequency thawing control system of the refrigerator can adjust an initial impedance value according to information of food materials, extract characteristic experience values of impedance change in a thawing process of the food materials, and the extracted characteristic experience values are used for judging whether the whole impedance matching system works normally or not, and ensure that the radio frequency system can still maintain working when detecting system faults under the conditions of external interference or internal faults. When distortion of the reflected signal is detected, the matching impedance value is automatically calculated, the calculated value is compared with the extracted characteristic experience value, if the error is within the allowable range, the matching impedance value is output according to the actually calculated matching impedance value, the optimal impedance is adjusted, if the error is beyond the allowable range of the experience value, the detection result is judged to be distorted, the output according to the characteristic experience value is output, the output according to the actually optimal calculating impedance is ensured, and the phenomenon that the adjustment value and the actual value caused by detection or calculation are seriously not matched, a large amount of system energy is consumed due to heating, and the thawed food material cannot be thawed normally is prevented.
It is worth to say that the characteristic experience value can be obtained in advance through modeling, tests are conducted under different states of different kinds of food materials, an experience thawing time range is obtained, for example, 1KG pork is thawed from-20 ℃, about 18MIN is needed, the experience value range is obtained through multiple measurement of pork with different fat-lean proportions and shapes, for example, within 13 to 25 minutes, 1KG is actually thawed at-20 ℃, the whole automatic thawing process is limited by the experience value, and the system is considered to be faulty if the range is not reached or exceeded.
Optionally, the method further comprises:
s6, thawing the current food material according to the thawing time;
s7, judging whether the lower limit value of the thawing experience value corresponding to the current food material is reached or not when the thawing stopping condition is reached;
s8, if yes, stopping thawing; if not, stopping thawing until reaching the lower limit value of the thawing experience value;
s9, judging whether the upper limit value of the thawing experience value corresponding to the current food material is reached or not when the thawing stop condition is not reached;
s10, if yes, stopping thawing; if not, continuing thawing.
When the thawing system starts thawing, the thawed food materials are detected in real time according to the food material reflection signals, and when the thawing stop conditions are met, the thawing process of the thawing system is automatic at present, and the temperature of the food materials is extracted from the reflection signals by detecting the reflection signals (the characteristics that the food materials change obviously at about-2 ℃ and the dielectric constant is utilized) to serve as an automatic stop sign. However, in actual use, the reflected signal extracts the current temperature information of the food as a judgment, and is affected by various factors such as the type and state of the food, the external environment and the like, and the reliability is insufficient, so that the phenomena that the food is not thawed, the temperature of the food is too high after thawing, the thawing is not stopped after long-time running, and the food is not thawed are caused. According to the refrigerator with the food material management system function, when a user takes out to defrost food materials, food material information can be provided to the defrosting system in advance, the defrosting system can be used for extracting defrosting time experience ranges from experience libraries according to various food material information including food material types, weight, storage time, storage temperature and the like, comprehensive influence degree and the like, whether the defrosting process reaches defrosting stop conditions or not is detected in real time, if the defrosting stop conditions are not met, whether the current defrosting time exceeds the upper limit of the characteristic defrosting time experience value of the food materials is judged, if the current defrosting time reaches the upper limit, defrosting is stopped immediately, and if the upper limit of the experience value is not met, the detection and judgment are continued. When the thawing stop condition is reached, whether the lower limit value of the thawing time of the food material characteristics is reached or not is judged, if the lower limit value of the thawing time is reached, the thawing is judged to be incomplete, and the thawing is carried out according to the lower limit value of the thawing time experience.
According to the embodiment of the invention, by combining the refrigerator food material management function, the problems that the refrigerator thawing system is not defrosted after long-time operation due to disturbance imbalance of detection signals or detection system faults, namely the system power transmission efficiency is low, the thawing system is not defrosted due to heating waste, the thawing system is not stopped accurately and is not stopped automatically and the like can be effectively prevented, and the stability of the refrigerator thawing system is improved.
Still further, the method further comprises:
and S11, sending out corresponding prompt information according to the thawing time.
The thawing refrigerator is provided with a sound playing device, and the thawing residual time is played regularly in the thawing process, or the residual thawing time is correspondingly displayed in a display screen.
Compared with the prior art, the control method for the thawing refrigerator disclosed by the embodiment of the invention detects the reflected signal of the current food material reflected after receiving the radio frequency signal, adjusts the radio frequency signal output by the signal source output module through the reflected signal, and the output radio frequency signal can thaw the current food material. In addition, by acquiring food material information of the current food material and acquiring a variation trend of the thawing parameter corresponding to the current food material pre-stored in the database according to the food material information, the thawing time of the current food material can be adjusted according to the variation trend of the thawing parameter, the food material can be thawed according to the food material information, and the thawing efficiency of the food material is improved.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims (10)

1. A defrosting refrigerator, comprising:
the storage cavity is used for storing food materials;
the signal source output module outputs a radio frequency signal with fixed frequency to the current food material;
a power amplifier that amplifies the radio frequency signal;
the tuner comprises a signal detection module and an impedance matching module, wherein the signal detection module is used for detecting a reflected signal reflected by the current food material after receiving the radio frequency signal, and the impedance matching module is used for matching the impedance of a load and the power amplifier;
the controller is configured to:
adjusting the radio frequency signal output by the signal source output module according to the reflected signal;
acquiring food material information of a current food material, and acquiring a thawing parameter change trend corresponding to the current food material in a pre-stored database according to the food material information; wherein the thawing parameter variation trend comprises at least one of food parameter variation trend, impedance variation trend and thawing time limit range;
and adjusting the thawing time of the current food material according to the thawing parameter variation trend.
2. The defrosting refrigerator of claim 1, wherein the controller is further configured to:
thawing the current food material according to the thawing time;
when the thawing stopping condition is reached, judging whether the lower limit value of the thawing experience value corresponding to the current food material is reached;
if yes, stopping thawing; if not, stopping thawing until reaching the lower limit value of the thawing experience value.
3. The defrosting refrigerator of claim 2, wherein the controller is further configured to:
when the thawing stopping condition is not reached, judging whether the upper limit value of the thawing experience value corresponding to the current food material is reached or not;
if yes, stopping thawing; if not, continuing thawing.
4. The defrosting refrigerator of claim 1, wherein the tuner is further configured to:
setting initial impedance of the impedance matching module according to food material information of the current food material;
and adjusting the impedance of the impedance matching module according to the reflected signal.
5. The defrosting refrigerator of claim 4, wherein the tuner is further configured to:
when the reflected signal distortion is detected, calculating a matching impedance value;
judging whether the difference value between the matching impedance value and the characteristic experience value of the current food material is within a preset error range or not; the characteristic experience value is preset, and a corresponding characteristic experience value can be obtained according to the food material information of the current food material;
if yes, adjusting the impedance of the impedance matching module according to the matching impedance value; if not, the impedance of the impedance matching module is adjusted according to the characteristic experience value.
6. The defrosting refrigerator of claim 1, wherein the food material information includes at least one of a kind, a quality, an initial temperature, and a dielectric constant of a current food material.
7. The defrosting refrigerator of claim 1, wherein the controller is further configured to:
and sending out corresponding prompt information according to the thawing time.
8. A defrosting refrigerator control method, characterized by comprising:
outputting a radio frequency signal with fixed frequency to the current food material; amplifying the radio frequency signal through a power amplifier;
controlling a signal detection module in the tuner to detect a reflected signal reflected by the current food after receiving the radio frequency signal, and controlling an impedance matching module in the tuner to match the impedance of the load and the power amplifier;
according to the reflected signals, adjusting the radio frequency signals output by a signal source output module in the defrosting refrigerator;
acquiring food material information of a current food material, and acquiring a thawing parameter change trend corresponding to the current food material in a pre-stored database according to the food material information; wherein the thawing parameter variation trend comprises at least one of food parameter variation trend, impedance variation trend and thawing time limit range;
and adjusting the thawing time of the current food material according to the thawing parameter variation trend.
9. The defrosting refrigerator control method of claim 8, further comprising:
thawing the current food material according to the thawing time;
when the thawing stopping condition is reached, judging whether the lower limit value of the thawing experience value corresponding to the current food material is reached;
if yes, stopping thawing; if not, stopping thawing until reaching the lower limit value of the thawing experience value;
when the thawing stopping condition is not reached, judging whether the upper limit value of the thawing experience value corresponding to the current food material is reached or not;
if yes, stopping thawing; if not, continuing thawing.
10. The defrosting refrigerator control method of claim 8, further comprising:
setting initial impedance of the impedance matching module according to food material information of the current food material;
adjusting the impedance of the impedance matching module according to the reflected signal;
when the reflected signal distortion is detected, calculating a matching impedance value;
judging whether the difference value between the matching impedance value and the characteristic experience value of the current food material is within a preset error range or not; the characteristic experience value is preset, and a corresponding characteristic experience value can be obtained according to the food material information of the current food material;
if yes, adjusting the impedance of the impedance matching module according to the matching impedance value; if not, the impedance of the impedance matching module is adjusted according to the characteristic experience value.
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CN202120285840.2U Active CN215063114U (en) 2020-12-02 2021-02-01 A kind of refrigerator
CN202120283919.1U Active CN214371183U (en) 2020-12-02 2021-02-01 Radio frequency power supply impedance matching system and unfreezing refrigerator
CN202120281991.0U Active CN214371180U (en) 2020-12-02 2021-02-01 Refrigeration storage device
CN202120285812.0U Active CN214371184U (en) 2020-12-02 2021-02-01 Radio frequency thawing refrigerator
CN202120286137.3U Active CN214371188U (en) 2020-12-02 2021-02-01 Refrigeration storage device
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CN202120283247.4U Active CN214371181U (en) 2020-12-02 2021-02-01 Refrigeration storage device
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