EP0321768A2 - Dispositif de contrôle pour le chauffage, la décongélation et/ou la cuisson d'aliments par des micro-ondes - Google Patents

Dispositif de contrôle pour le chauffage, la décongélation et/ou la cuisson d'aliments par des micro-ondes Download PDF

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Publication number
EP0321768A2
EP0321768A2 EP19880120279 EP88120279A EP0321768A2 EP 0321768 A2 EP0321768 A2 EP 0321768A2 EP 19880120279 EP19880120279 EP 19880120279 EP 88120279 A EP88120279 A EP 88120279A EP 0321768 A2 EP0321768 A2 EP 0321768A2
Authority
EP
European Patent Office
Prior art keywords
microwave
food
sensor
arrangement according
control arrangement
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
EP19880120279
Other languages
German (de)
English (en)
Other versions
EP0321768A3 (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.)
BSH Hausgeraete GmbH
Original Assignee
Bosch Siemens Hausgerate GmbH
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 Bosch Siemens Hausgerate GmbH filed Critical Bosch Siemens Hausgerate GmbH
Publication of EP0321768A2 publication Critical patent/EP0321768A2/fr
Publication of EP0321768A3 publication Critical patent/EP0321768A3/fr
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/687—Circuits for monitoring or control for cooking
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/688—Circuits for monitoring or control for thawing

Definitions

  • the present invention relates to a control arrangement for heating, thawing and / or cooking foods to be thermally treated by exposure to microwave energy within a closed cooking space, in particular in domestic stoves.
  • 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 sealed in a microwave-tight manner by means of a microwave generator, namely a magnetron, via waveguides.
  • 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.
  • the object of the present invention to provide an arrangement for the thermal treatment of foodstuffs in which the respective cooking state of the foodstuff can advantageously be detected without intervention in the foodstuff, but nevertheless close to the body, when these foods are exposed to microwave energy.
  • An arrangement which meets these requirements is characterized according to the invention in that a sensor detecting the microwave energy potential is arranged in the space filled with microwave energy between the microwave generator and the food to be charged with microwave energy, via which sensor the control power for the microwave generator can be controlled.
  • This control arrangement makes use of the knowledge that a cooked food undergoes heat change in terms of its microwave absorption capacity. These changes are particularly striking when a food changes from frozen to thawed. With the help of the control arrangement according to the invention, these changes are detected in the food to be cooked, namely in that a sensor is arranged in the space filled with microwave energy between the microwave generator and the foodstuff exposed to microwave energy, which sensor detects the prevailing microwave energy potential.
  • the microwave energy potential in this room depends on the one hand on the microwave energy that is radiated into this room by a microwave generator and on the other hand on the microwave energy that is absorbed by the food. Now it is possible to either evaluate the relation between the radiated and absorbed microwave energy as an absolute value of the microwave energy space potential or its temporal changes.
  • control arrangement according to the invention will preferably be used in stoves in which the food to be cooked is treated thermally by microwave exposure.
  • the measure according to the invention is also suitable when the food to be treated thermally is subjected to purely thermal action.
  • the microwave must be coupled into the cooking space for the measurement measures. This microwave coupling can then be very weak, i.e. low energy and impulsive.
  • the control arrangement according to the invention is characterized in that the process sequence control device for the operating mode "thawing a food" upon detection of the thawing temperature range by measuring field strength changes in the microwave range as a result of the changed microwave absorption capacity of the surface-thawed foodstuff, a decrease in the microwave energy triggers.
  • the process sequence control device for the operating mode "thawing a food” upon detection of the thawing temperature range by measuring field strength changes in the microwave range as a result of the changed microwave absorption capacity of the surface-thawed foodstuff a decrease in the microwave energy triggers.
  • the thawing of a food as quickly as possible is achieved without the risk that the food is already being cooked on its surface.
  • relatively high microwave energy or other thawing energy can be supplied to the food.
  • the thawing energy supplied is reduced to such an extent that a heat balance is formed between the thawed outside area of the food and the still frozen food core. The thawing process can thus be evened out and optimized in terms of time.
  • control arrangement is characterized in that the process sequence control device for cooking processes to be carried out contains representative values of the field strength in the microwave space in relation to the supplied microwave energy and stores these with the respective actual microwave field strength comparison detected by the sensor and as a function of the comparison result can be controlled by the process flow control device, the supply of microwave energy via the microwave generator.
  • the process sequence control device can be supplied with values for the initial conditions given by the food to be treated and / or for the intended end conditions.
  • the control arrangement according to the invention is characterized in that an evaluation circuit connected downstream of the sensor for the detection of the microwave energy potential in the microwave room contains representative values for the "idle mode" closed in the microwave room and that upon detection of a corresponding microwave energy potential by the sensor via the evaluation circuit, the control of the microwave generator and thus the microwave generation is switched off.
  • the evaluation circuit is preferably equipped with a timing element, so that it uses this to trigger the switch-off of the microwave generator when a value specified for "idle mode" is received.
  • the microwave is mistaken If the energy supply to the cooking chamber is switched on by an operator, even though there is no food to be cooked in the cooking chamber, the microwave energy supply is switched off in good time when these circuitry measures are taken, so that no dangerous moments arise.
  • the timing element By using the timing element, however, so much microwave energy is coupled in that the smallest quantities of food are still influenced in a relevant thermal manner.
  • Provisions can preferably be made in such a way that the evaluation circuit switches off the microwave generator only when the maximum microwave power has been set and / or, if appropriate, an additional high thermal heating power supply. This means that only relatively high microwave powers, which can lead to problem situations, either alone or in conjunction with additional thermal heating powers, are switched off, while lower microwave power radiation is not switched off. Because of the microwave losses in the waveguide and cooking space elements, it can be problematic to detect food of low mass within the cooking space with sufficient microwave technology. Such quantities of food can be subjected to lower, but also sufficient, microwave energy without the risk of automatic shutdown.
  • the microwave sensor can be designed as an inductive probe or as a capacitive probe for the control arrangement according to the invention. It can be expedient to arrange the microwave sensor as a directional coupler arrangement in the region of the waveguide arranged between the microwave generator and the food treatment region. In this area, the microwave sensor is usually not exposed to any relevant vapors and therefore cannot become dirty. In particular, the microwave field conditions can be recorded relatively precisely in this area.
  • the figure shows a schematic representation of the basic structural units 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 converts these input values for the control of the power control unit.
  • 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 which microwave energy potential prevails in the cooking chamber, since not only the microwave generator MG is able to absorb microwave energy feed the waveguide HL, but also feeds the cooking chamber back into the waveguide HL in accordance with the microwave energy potential prevailing in it, which can be detected by the microwave directional coupler RK at the output A2.
  • the microwave potential that arises in the cooking chamber when microwave radiation is present is dependent on the microwave absorption capacity of the cooking product GG located in the cooking chamber GR.
  • the microwave absorption The ability and convertibility into heat of the food depends on its type, its mass (weight) and its condition. If, for example, no food to be cooked is arranged in the cooking space GR, no substantial energy is absorbed in the cooking space GR and the declining microwave energy detected by the microwave directional coupler RK will increase to a very high degree in relation to the coupled-in microwave energy.
  • the change in the state of the food to be cooked for example from the frozen state to the thawed state, becomes important for the control measures.
  • the outputs A1 and A2 of the directional coupler RK are fed to a comparison circuit VS, which carries out the relation between the two measured values that are detected and supplied, and from this passes on 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.
  • the control logic AL can be entered via the display / input panel AE, the values for the individual cooking processes or the control logic AL contains such values that are permanently entered for the implementation of standard cooking processes.
  • a corresponding sensor for detecting the microwave energy potential can also be arranged in the cooking chamber itself.
  • different microwave energy intensities build up in the cooking space GR.
  • these microwave energy intensities are additionally spatially changed via the rotating antenna MA in the present exemplary embodiment.
  • the microwave energy emitted by the microwave generator MG is used both for the thermal treatment of the food GG and for measuring purposes.
  • This link is possible, but it is by no means a prerequisite for the measurements. Rather, it is also possible to provide only microwave energy for the measuring purposes in the cooking space. This microwave energy can then be relatively small and can only be emitted in time slots used for the measurement purposes.
  • the microwave frequency for measurement purposes deviates from the microwave frequency for carrying out the cooking process, which has measurement-related advantages in that different wavelengths of the microwaves have different penetration depths in the food.
  • solid-state microwave energy generators since, as has already been stated, the required powers can be relatively small.
  • microwave technology only for measuring purposes in relation to the quality of the food to be cooked and to operate the thermal treatment in conjunction or exclusively by means of thermal heating elements.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Electric Ovens (AREA)
EP19880120279 1987-12-23 1988-12-05 Dispositif de contrôle pour le chauffage, la décongélation et/ou la cuisson d'aliments par des micro-ondes Ceased EP0321768A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3743921 1987-12-23
DE19873743921 DE3743921A1 (de) 1987-12-23 1987-12-23 Steueranordnung zum waermetechnischen behandeln von lebensmitteln durch mikrowellenenergie

Publications (2)

Publication Number Publication Date
EP0321768A2 true EP0321768A2 (fr) 1989-06-28
EP0321768A3 EP0321768A3 (fr) 1991-05-02

Family

ID=6343495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880120279 Ceased EP0321768A3 (fr) 1987-12-23 1988-12-05 Dispositif de contrôle pour le chauffage, la décongélation et/ou la cuisson d'aliments par des micro-ondes

Country Status (6)

Country Link
US (1) US4882462A (fr)
EP (1) EP0321768A3 (fr)
JP (1) JPH01195690A (fr)
KR (1) KR890011485A (fr)
DE (1) DE3743921A1 (fr)
YU (1) YU226388A (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1237959B (it) * 1990-02-01 1993-06-19 Eurodomestici Ind Riunite Metodo e dispositivo per il rilevamento del peso di alimenti posti in un forno a microonde e per controllarne il trattamento
DE4207459C2 (de) * 1992-03-10 1994-05-05 Miele & Cie Mikrowellenherd mit einer Vorrichtung zur Sensierung des Beladungszustandes
DE4217943A1 (de) * 1992-05-30 1993-12-02 Miele & Cie Backofen oder Mikrowellenofen mit Temperatursonde
KR960007113B1 (ko) * 1993-09-28 1996-05-27 엘지전자주식회사 전자레인지의 자동해동 방법
KR0115473Y1 (ko) * 1994-07-06 1998-04-20 구자홍 전자레인지의 안전장치
US6396035B2 (en) * 1999-01-14 2002-05-28 Samsung Electronics, Co., Ltd. Microwave oven and data obtaining method therefor
US6166362A (en) * 1999-01-14 2000-12-26 Samsung Electronics Co., Ltd. Automatic cooking control method for a microwave oven
US6166363A (en) * 1999-01-14 2000-12-26 Samsung Electronics Co., Ltd. Defrosting method for a microwave oven
JP2006128075A (ja) * 2004-10-01 2006-05-18 Seiko Epson Corp 高周波加熱装置、半導体製造装置および光源装置
JP2008270112A (ja) * 2007-04-25 2008-11-06 Matsushita Electric Ind Co Ltd 高周波加熱装置の制御方法
DE102007051638B8 (de) * 2007-10-26 2010-06-10 Rational Ag Verfahren zur Erkennung des Beladungszustandes eines Gargerätes mit Mikrowellengaren und Gargerät zur Durchführung solch eines Verfahrens
EP2326141B1 (fr) * 2009-11-18 2012-12-26 Whirlpool Corporation Four à micro-ondes et procédé correspondant comportant un magnétron pour chauffer et un SSMG destiné à la détection des objets chauffés
JP6528088B2 (ja) * 2014-07-10 2019-06-12 パナソニックＩｐマネジメント株式会社 マイクロ波加熱装置
DE102024124194A1 (de) * 2024-08-23 2026-02-26 Rational Aktiengesellschaft Verfahren zum Einstellen einer Mikrowellenleistung sowie Kombinationsgargerät

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GB894860A (en) * 1959-08-31 1962-04-26 Ass Elect Ind Protective apparatus for a high frequency generator
DE1466007A1 (de) * 1965-11-12 1969-03-27 Krupp Gmbh Vorrichtung zum Schutz von Kreuzfeldgeneratorroehren
US3662140A (en) * 1970-10-07 1972-05-09 Raytheon Co High frequency electronic heating apparatus
US4009359A (en) * 1975-11-07 1977-02-22 Chemetron Corporation Method and apparatus for controlling microwave ovens
US4210795A (en) * 1978-11-30 1980-07-01 Litton Systems, Inc. System and method for regulating power output in a microwave oven
JPS5780693A (en) * 1980-11-10 1982-05-20 Matsushita Electric Industrial Co Ltd High frequency heater
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JPS6139481A (ja) * 1984-07-31 1986-02-25 丸山　悠司 マイクロ波加熱装置
JPS61143630A (ja) * 1984-12-14 1986-07-01 Sharp Corp 加熱器
DE3513121A1 (de) * 1985-04-12 1986-10-23 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von titandioxid
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JPH0697096B2 (ja) * 1986-03-20 1994-11-30 松下電器産業株式会社 加熱装置

Also Published As

Publication number Publication date
US4882462A (en) 1989-11-21
JPH01195690A (ja) 1989-08-07
YU226388A (en) 1990-12-31
KR890011485A (ko) 1989-08-14
DE3743921C2 (fr) 1992-12-17
DE3743921A1 (de) 1989-07-13
EP0321768A3 (fr) 1991-05-02

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