EP0321767A2 - Disposition pour le traitement électrothermique des aliments - Google Patents

Disposition pour le traitement électrothermique des aliments Download PDF

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Publication number
EP0321767A2
EP0321767A2 EP19880120278 EP88120278A EP0321767A2 EP 0321767 A2 EP0321767 A2 EP 0321767A2 EP 19880120278 EP19880120278 EP 19880120278 EP 88120278 A EP88120278 A EP 88120278A EP 0321767 A2 EP0321767 A2 EP 0321767A2
Authority
EP
European Patent Office
Prior art keywords
microwave
food
energy
waveguide
directional coupler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP19880120278
Other languages
German (de)
English (en)
Other versions
EP0321767A3 (fr
Inventor
Julius Dipl.-Ing. Husslein
Helmut Dipl.-Ing. Hess
Wolfgang Dipl.-Ing. Beifuss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOSCH-SIEMENS HAUSGERAETE GMBH
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0321767A2 publication Critical patent/EP0321767A2/fr
Publication of EP0321767A3 publication Critical patent/EP0321767A3/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits

Definitions

  • the present invention relates to an arrangement for the thermal treatment of food by applying microwave energy in a domestic oven using a microwave waveguide, in which microwave energy is coupled in from a microwave generator and from which microwave energy is coupled out into a food treatment area.
  • microwave ovens or microwave ovens with or without additional thermal heating sources are used, into which the microwave energy is fed into a cooking space which is sealed off in a microwave-tight manner by means of a microwave generator, namely a magnetron.
  • An approved microwave frequency of 2.45 GHz is used.
  • the coupled microwave energy is usually 600 to 700 watts.
  • the microwaves coupled into the cooking space penetrate more or less deeply and intensively into the food to be cooked, depending on the type and nature of the food to be cooked, and the microwave energy is converted there into thermal energy and is used to carry out cooking processes or to defrost food.
  • different power levels can be set in known cookers up to this maximum output. There are various options for this.
  • microwave power it is possible, for example, to change the microwave power by switching capacitances on and off in the magnetron circuit.
  • Another widely used measure for reducing the maximum power is given by the fact that the maximum power is generated in a clocked manner, ie that in relatively short intervals Microwave transmission is interrupted for predetermined pause times.
  • the setting of the suitable microwave power for the respective cooking process is the responsibility of the operator in known household appliances. Thus, the operator must take great care to avoid inappropriate, unfavorable or even harmful settings of the microwave energy.
  • any available microwave power can be set up to the maximum power and this power is also generated by the microwave generator and coupled into the cooking space, even if it contains relatively little or no food that is capable of using the microwave energy converted into heat energy by absorption.
  • the generated microwave energy the existence of which is not or hardly discernible outside the oven, is undesirably reduced within the oven and partially fed back to the microwave generator. If this type of incorrect operation lasts longer, impairments and damage cannot fail to occur within the unit.
  • an object of the present invention to provide an arrangement for the thermal treatment of food by exposure to microwave energy in household ovens, in which it is excluded as far as possible that inappropriate, in particular inappropriate high microwave outputs are generated for the exposure to the microwave space.
  • An arrangement which meets these requirements is characterized according to the invention in that a microwave directional coupler which influences the setting of the microwave generator via an evaluation circuit and / or controls a display device is arranged in the region of the waveguide.
  • the arrangement according to the invention is characterized in that the evaluation circuit, the measurement results of the microwave directional coupler representative of the microwave field strength movement in the food treatment area as microwave demand criteria depending on the quantity and the type of food to be thermally treated for the Control of the microwave energy to be emitted by the microwave generator evaluates. This ensures that, depending on the situation in the cooking space, a corresponding and / or maximum microwave power is processed in terms of control technology.
  • the arrangement according to the invention is characterized in that the evaluation circuit evaluates the measurement results of the microwave directional coupler which are representative of the microwave field strength assignment in the food treatment area as process flow control values for controlling the microwave energy to be emitted by the microwave generator.
  • the directional coupler arranged in the area of the waveguide can detect microwave field strength occupancy differences that are representative of changes in the state of the food. While microwave food is being applied to the food, it is converted into heat energy in the food. The consequence of this is changes in the absorption capacity of the food for microwave energy. These differences are particularly large and can therefore be recorded particularly cheaply when the food to be frozen is converted to the thawed state or when the boiling state is reached. Especially with these changes in the state of the food, it is expedient to make changes in the supply and measurement of the microwave power.
  • the arrangement according to the invention is characterized in that the measurement results detected by the evaluation circuit via the microwave directional coupler are provided for the adjustment of the microwave waveguide, including the microwave coupling and decoupling elements.
  • the individual device can thus be detected with respect to the conduction of the microwave energy, starting from the microwave generator via the waveguide into the cooking space, and the geometry of adjustable coupling elements in the waveguide and coupling elements from the waveguide can be changed such that each derives an optimally optimal, low-reflection microwave transition.
  • the arrangement according to the invention is characterized in that in the area of the microwave waveguide for detecting the energy emitted by the microwave generator and for the opposing energy components, one of two directional couplers, at the one outputs of which the measuring device is connected and the other of which Outputs are equipped with a reflection-free termination, are arranged anti-parallel.
  • the figure shows a schematic representation of the basic components of a microwave oven.
  • Microwave energy is coupled into a cooking chamber GR of the microwave oven, within which cooked food GG to be treated thermally is introduced via a rotating antenna MA.
  • This rotating antenna MA takes over the microwave energy from a waveguide HL, which in turn takes over the microwave energy from a microwave generator MG, a magnetron.
  • a power control unit LS is arranged, which contains a high-voltage transformer and rectifier and capacitor units in a known manner.
  • the setting values relating to the microwave power to be radiated into the cooking space GR and the duration of this irradiation are entered into a control logic AL via a display / operating panel AE, which logic logic controls these input values for the
  • Control of the power control unit implements.
  • the set values can be displayed on the AE display / control panel.
  • a microwave directional coupler RK is coupled to the waveguide HL, an output line A1 of which detects measured values which correspond to the microwave energy traveling from the microwave generator MG in the direction of the cooking chamber GR through the waveguide HL and whose second output A2 detects measured values for opposing microwave energy.
  • the relation of these microwave energy migrations and thus the relation of the measured quantities detected by the outputs A1 and A2 of the directional coupler RK gives a good indication of the reason, whatever the reason, that the microwave power emitted by the microwave generator MG in the cooking space GR actually does is absorbed, essentially by the introduced food GG.
  • the outputs A1 and A2 of the directional coupler RK are fed to a comparison circuit VS, which carries out a relation between the two detected and supplied measured values and from this forwards a criterion to the control logic AL.
  • the power control LS for the microwave generator MG is influenced and readjusted in accordance with the energy requirement within the cooking chamber GR and the entered values. If, for example, due to the very high microwave energy return detected by the microwave directional coupler RK, it can be assumed that there is no food or food with only a very small mass in the cooking chamber GR, the control logic AL switches the power control LS off after a short switch-on time.
  • the control logic AL can contain values that have been permanently entered for carrying out standard cooking processes. By superimposing the values detected by the microwave directional coupler RK, which currently represent the cooking state of the food, the progress of the individual process steps can be controlled and modifications of these steps can be carried out.
  • the arrangement of the microwave directional coupler RK is also useful for optimally and individually setting the positions of the coupling and decoupling elements of the waveguide for each arrangement.
  • a measured value as processed at the outputs A 1 and A2 of the microwave directional coupler RK, is sent to the diplay of the display / control panel AE.
  • the position of the magnetron MG and the rotating antenna MA to the waveguide HL can then be changed until optimal results are signaled.
  • two eccentric bearings arranged one inside the other can be used for this purpose.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)
  • Surgical Instruments (AREA)
EP19880120278 1987-12-23 1988-12-05 Disposition pour le traitement électrothermique des aliments Ceased EP0321767A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3743919 1987-12-23
DE19873743919 DE3743919A1 (de) 1987-12-23 1987-12-23 Anordnung zur waermetechnischen behandlung von lebensmitteln

Publications (2)

Publication Number Publication Date
EP0321767A2 true EP0321767A2 (fr) 1989-06-28
EP0321767A3 EP0321767A3 (fr) 1991-05-02

Family

ID=6343494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880120278 Ceased EP0321767A3 (fr) 1987-12-23 1988-12-05 Disposition pour le traitement électrothermique des aliments

Country Status (5)

Country Link
EP (1) EP0321767A3 (fr)
JP (1) JPH01195689A (fr)
KR (1) KR890011484A (fr)
DE (1) DE3743919A1 (fr)
YU (1) YU225288A (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4034160C1 (en) * 1990-10-26 1992-04-30 Bosch-Siemens Hausgeraete Gmbh, 8000 Muenchen, De Directional coupler for domestic microwave oven - has stripline structure terminated by HF diode and wave resistance
JP2581842B2 (ja) * 1990-11-19 1997-02-12 動力炉・核燃料開発事業団 マイクロ波加熱装置
JP5920993B2 (ja) * 2010-05-03 2016-05-24 ゴジ リミテッド モーダル解析
DE102012006578A1 (de) * 2012-03-30 2013-10-02 Topinox Sarl Gargerät und Verfahren zum Garen von Lebensmitteln
EP3324123B1 (fr) 2016-11-22 2019-11-13 Miele & Cie. KG Procédé de chauffage d'un liquide en reconnaissance d'un point d'ébullition
DE102019128204B4 (de) * 2019-10-18 2021-05-06 Topinox Sarl Verfahren zum Kalibrieren eines Mikrowellenmoduls, Kalibriersystem, Mikrowellenmodul sowie Gargerät
DE102019128203B3 (de) * 2019-10-18 2021-04-22 Tq-Systems Gmbh Verfahren zum Kalibrieren eines Mikrowellenmoduls, Kalibriersystem, Mikrowellenmodul sowie Mikrowellenvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1148677B (de) * 1961-02-09 1963-05-16 Siemens Elektrogeraete Gmbh HF-Strahlungsherd mit Schutz des HF-Generators
US4210795A (en) * 1978-11-30 1980-07-01 Litton Systems, Inc. System and method for regulating power output in a microwave oven
US4211911A (en) * 1979-01-16 1980-07-08 General Electric Company Microwave directional coupler and detector module
EP0234528A1 (fr) * 1986-02-21 1987-09-02 Kabushiki Kaisha Toyota Chuo Kenkyusho Appareil de micro-ondes pour chauffage d'articles céramiques
US4714810A (en) * 1986-07-28 1987-12-22 Arizona Board Of Regents Means and methods for heating semiconductor ribbons and wafers with microwvaes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009359A (en) * 1975-11-07 1977-02-22 Chemetron Corporation Method and apparatus for controlling microwave ovens
JPS6139481A (ja) * 1984-07-31 1986-02-25 丸山　悠司 マイクロ波加熱装置
DE3544270A1 (de) * 1985-12-14 1987-06-25 Kraftanlagen Ag Verfahren und einrichtung zur trocknung kontaminierter fluessigkeiten und loesungen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1148677B (de) * 1961-02-09 1963-05-16 Siemens Elektrogeraete Gmbh HF-Strahlungsherd mit Schutz des HF-Generators
US4210795A (en) * 1978-11-30 1980-07-01 Litton Systems, Inc. System and method for regulating power output in a microwave oven
US4211911A (en) * 1979-01-16 1980-07-08 General Electric Company Microwave directional coupler and detector module
EP0234528A1 (fr) * 1986-02-21 1987-09-02 Kabushiki Kaisha Toyota Chuo Kenkyusho Appareil de micro-ondes pour chauffage d'articles céramiques
US4714810A (en) * 1986-07-28 1987-12-22 Arizona Board Of Regents Means and methods for heating semiconductor ribbons and wafers with microwvaes

Also Published As

Publication number Publication date
KR890011484A (ko) 1989-08-14
DE3743919C2 (fr) 1989-10-05
DE3743919A1 (de) 1989-07-13
YU225288A (en) 1991-04-30
JPH01195689A (ja) 1989-08-07
EP0321767A3 (fr) 1991-05-02

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