EP4120798A1 - Appareil électroménager à haute fréquence, de préférence robot de cuisine à haute fréquence - Google Patents

Appareil électroménager à haute fréquence, de préférence robot de cuisine à haute fréquence Download PDF

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Publication number
EP4120798A1
EP4120798A1 EP22177704.8A EP22177704A EP4120798A1 EP 4120798 A1 EP4120798 A1 EP 4120798A1 EP 22177704 A EP22177704 A EP 22177704A EP 4120798 A1 EP4120798 A1 EP 4120798A1
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EP
European Patent Office
Prior art keywords
frequency
paths
energy
designed
household appliance
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.)
Pending
Application number
EP22177704.8A
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German (de)
English (en)
Inventor
Thomas Wixforth
André Kersting
Jan Schmull
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.)
Miele und Cie KG
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Miele und Cie KG
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 Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP4120798A1 publication Critical patent/EP4120798A1/fr
Pending 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
    • H05B6/70—Feed lines
    • H05B6/705—Feed lines using microwave tuning
    • 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
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings

Definitions

  • the invention relates to a high-frequency household appliance according to the preamble of patent claim 1 and a high-frequency heating module for use in such a high-frequency household appliance according to patent claim 15.
  • Microwaves are understood to mean electromagnetic waves with a frequency of about 1 to about 300 GHz, i.e. with wavelengths of about 30 cm to about 1 mm. Microwaves can excite molecules to vibrate and thereby increase the temperature of the molecules. This is used, for example, in microwave ovens to heat or cook food within the cooking space.
  • a microwave oven also known as a microwave oven, usually has an outer housing, inside which a cooking space is provided.
  • the cooking chamber is accessible from the outside through an access opening which can be closed and opened in a pivotable manner, for example by means of a door or a flap.
  • Display and control elements are also usually provided on the outside, for example to enable a user to set the output and the duration of the process.
  • An intermediate space is formed between the outer housing and the cooking chamber, in which at least one microwave generator is usually arranged, which can generate the microwaves and conduct them through at least one corresponding high-frequency waveguide into the cooking chamber as a cavity.
  • magnetrons were used to generate microwave radiation, but nowadays electronic circuits such as transistors are used for this purpose.
  • the coaxial line can be designed together with an antenna, i.e. without any additional plug connection, and attached to the wall of the interior.
  • the antenna may be a monopole-type or an inverted-F-shaped antenna.
  • the HF energy can also be fed into the interior via a HF hollow line (high-frequency hollow line).
  • a HF hollow line high-frequency hollow line
  • Usual cross-sections of waveguides can be rectangular, for example or be oval.
  • the HF waves can run vertically via such waveguides and pass through a rectangular or oval window, for example, in the wall of the interior and reach the interior.
  • a Dialog cooker is based on well-known or conventional ovens, which work with an energy supply such as top and bottom heat or circulating air, so that heat, precisely adjusted to the degree, penetrates the food from the outside and slowly works its way into the inside of the food.
  • This type of cooking, such as baking, for example has such an effect on the food as the food to be cooked that the outer layers of the food are heated for a comparatively long time or strongly, but the core of the food is heated comparatively briefly or little, since the heat dissipates during the cooking process must first spread from the outer layers to the core of the food.
  • Devices of this type for feeding high-frequency energy (HF energy) into a treatment room of a household appliance or a kitchen appliance provide a separate HF signal generator for each path or for each feed. This makes it possible to generate the HF signals of the paths with different frequencies, which can be desirable for certain methods of heating or for certain heating programs.
  • HF energy high-frequency energy
  • the EP 2 499 505 A1 describes devices and methods for applying EM energy to a load.
  • the devices and methods may include at least one processor configured to receive information indicative of the energy dissipated by the load for each of a plurality of modulation space elements.
  • the processor may also be configured to associate each of the plurality of modulation space elements with a corresponding period of power application based on the information received.
  • the processor may be further configured to regulate the power applied to the load such that, for each of the plurality of modulation space elements, power is applied to the load with the appropriate amount of power application time.
  • the invention therefore faces the problem of creating a high-frequency household appliance of the type described in the introduction, so that the protection of the environment against electromagnetic waves of high-frequency energy can be improved or even guaranteed.
  • the propagation of impermissibly strong high-frequency energy and/or high-frequency energy of impermissible frequencies into the environment of the high-frequency household appliance should be reduced or even completely avoided.
  • an alternative to known high-frequency household appliances of this type should be created.
  • Such a high-frequency household appliance can be any technical device that can be used in a household for household chores, with the household chore being able to be carried out additionally or solely by means of high-frequency (abbreviated: HF) energy.
  • the high-frequency energy can be emitted into the treatment room by means of electromagnetic waves, in order to warm up or heat an item to be treated there.
  • Such high-frequency electromagnetic waves can, in particular, have frequencies in the range from approximately 1 to approximately 300 GHz, i.e. wavelengths from approximately 30 cm to approximately 1 mm.
  • the implementation can take place, for example, as a household appliance in the form of a washing machine, a tumble dryer, a washer-dryer and the like, so that the high-frequency energy can be used additionally or solely for heating water or detergent or for drying wet laundry inside the washing drum as a treatment room .
  • a high-frequency kitchen appliance the high-frequency energy can be used additionally or solely for cooking food in the cooking space as a treatment space.
  • Such kitchen appliances can be, for example, microwave ovens, ovens, dialog cookers or combi appliances.
  • the frequency range of the high-frequency electromagnetic wave of the first or of the corresponding high-frequency path can be restricted to a predetermined frequency range by means of the first bandpass filter. This can have a correspondingly restricting effect on the high-frequency energy or on the corresponding electromagnetic wave, which is emitted from the transition of the corresponding high-frequency path to or into the treatment room.
  • the first bandpass filter can thus also serve to prevent undesired or impermissible frequencies below and above the pass-through range from being passed on or from spreading into the treatment room. This can serve to protect the environment and in particular to comply with radio and EMC limit values.
  • the high-frequency energy is fed to a detector which is able to detect a parameter of the high-frequency energy such as in particular detecting the frequency, the amplitude and/or the phase position of the electromagnetic wave of the high-frequency energy and supplying these detected parameters to a security unit.
  • the security unit can now carry out an evaluation of the at least one recorded parameter to determine whether this parameter complies with at least one predetermined limit value.
  • This limit value or several limit values of a parameter or one limit value or several limit values of different parameters can enable an assessment of whether or not the high-frequency energy after exiting the first bandpass filter is desired or permissible with regard to the corresponding parameter.
  • the high-frequency heating module and in particular its safety unit can react to this and change the operation of the high-frequency signal generator.
  • the generation of the unwanted or impermissible high-frequency energy or its electromagnetic wave by the high-frequency signal generator can now be omitted. In any case, this can be displayed or communicated to a user in order to carry out or arrange for repairs to be made to the high-frequency household appliance.
  • the protection of the environment against electromagnetic waves of high-frequency energy can thereby be improved or even guaranteed.
  • the propagation of impermissibly strong high-frequency energy and/or high-frequency energy of an impermissible frequency into the area surrounding the high-frequency household appliance can be reduced or even completely avoided.
  • the high-frequency heating module preferably at least the first high-frequency path, particularly preferably several high-frequency paths, very particularly preferably all high-frequency paths, of the high-frequency heating module have a high-frequency switch, which is designed supply the high-frequency energy from the first bandpass filter either to the transition to the treatment room or to the detector.
  • the high-frequency energy can be temporarily or briefly removed from the “normal” transmission path or branched off and fed to the detector for the purpose of the evaluation described above.
  • the high-frequency energy can be conducted further to the treatment room.
  • the evaluation and "normal" operation can be carried out alternatively.
  • the high-frequency switch is a high-frequency switch of a phase shifter, preferably a high-frequency path.
  • This aspect of the invention is based on the knowledge that such phase shifters usually have a number of high-frequency switches anyway, in order to be able to carry out the intended function of the phase shifter. Accordingly, the outlay for realizing a high-frequency switch, as described above, can be kept comparatively low by adding a further high-frequency switch to a phase shifter, which can supply the high-frequency energy to the detector at times, as described above. This can keep the implementation effort low.
  • the detector is designed to detect the parameter of the high-frequency energy at predetermined, preferably equal, time intervals. This can allow the actual, i.e. the "normal", transmission of the high-frequency energy to the treatment room to be temporarily interrupted in favor of the evaluation described above, as already mentioned above.
  • a plurality of high-frequency paths each have at least one first bandpass filter, with each of the high-frequency paths having a detector and/or a safety unit or with a plurality of high-frequency paths, preferably all high-frequency -Paths, have a common detector and/or a common security unit.
  • the aspects of the invention described above can be transferred to a plurality or to all high-frequency paths of the high-frequency heating module.
  • both a central detector and a central security unit can be used for several or for all high-frequency paths, which can keep the effort low.
  • at least one detector and/or at least one security unit for several high-frequency paths or for a single high-frequency path can be used, which can increase the scope for design.
  • At least one radio-frequency path preferably several radio-frequency paths, particularly preferably all radio-frequency paths, also has at least one second band-pass filter, which is configured redundantly to the first band-pass filter, with the second band-pass filter preferably behind, particularly preferably immediately behind a phase shifter.
  • the second band-pass filter is not connected to the detector or the output signal of the second band-pass filter is not supplied to the detector, which can keep the conversion effort low. Rather, the second bandpass filter serves as a safety function in order to take over the function of the first bandpass filter if the first bandpass filter does not function as intended. This can improve protection of the environment from an undesirable or impermissible nature of the high-frequency energy or its electromagnetic wave.
  • the power of the high-frequency electromagnetic wave there can be amplified within the high-frequency path or within the high-frequency feed. This can be done in one or more stages to achieve higher performance.
  • a forward and/or reverse high-frequency wave of the emitted high-frequency energy can be detected and the recorded data can be evaluated, for example to determine the generation of the high-frequency electromagnetic wave by the high-frequency signal generator and/or other electronic components within of the respective high-frequency path.
  • This can increase the design latitude of the high-frequency electromagnetic wave that is emitted into the treatment room.
  • Such a high-frequency coupler can be designed, for example, as a 4-port coupler or as a 6-port coupler.
  • the amplitude of the high-frequency electromagnetic wave can be influenced in a targeted manner in the course of the corresponding high-frequency path.
  • the phase of the high-frequency electromagnetic wave can be influenced in a targeted manner in the course of the corresponding high-frequency path.
  • Such a high-frequency isolator can be implemented, for example, by means of a high-frequency circulator with a high-frequency load resistor. In any case, this allows the electronic components of the corresponding high-frequency path to be protected against powerful reverse-running high-frequency waves of the high-frequency energy emitted, in order to avoid damage or destruction of the electronic components of the corresponding high-frequency path.
  • the corresponding measurement data can be acquired, for example, by means of the high-frequency coupler described above, which for this purpose can have circuits such as, for example, high-frequency detectors, ADCs (analog-to-digital converters or analog-to-digital converters) and the like.
  • circuits such as, for example, high-frequency detectors, ADCs (analog-to-digital converters or analog-to-digital converters) and the like.
  • a corresponding influence can be exerted on the forward-running high-frequency wave of the emitted high-frequency energy in this way, because since the amplitude and the phase of a high-frequency wave running forwards and backwards at the high-frequency coupler of the respective high-frequency path depend on the high-frequency wave fields in the treatment room, contain these Measurement data thus information about the loading of the treatment room, e.g. B. via a food, via the high-frequency wave fields and via the high-frequency energy supply.
  • This information can be used by heating programs of the control unit to control the frequency of the high-frequency signal generator and, if necessary, of actuators of the respective high-frequency path such as attenuators and/or phase shifters, and thus advantageously regulate the high-frequency energy supply.
  • control unit is also designed to control at least the high-frequency signal generator, preferably also at least one attenuator and/or a phase shifter of at least one high-frequency path, preferably several high-frequency paths, particularly preferably all high-frequency paths of the determined amplitude and/or the determined phase, preferably to change the frequency of the high-frequency energy.
  • the control unit is also designed to control at least the high-frequency signal generator, preferably also at least one attenuator and/or a phase shifter of at least one high-frequency path, preferably several high-frequency paths, particularly preferably all high-frequency paths of the determined amplitude and/or the determined phase, preferably to change the frequency of the high-frequency energy.
  • the present invention also relates to a high-frequency heating module for use in a high-frequency household appliance as described above.
  • a high-frequency heating module can be made available in order to implement a high-frequency household appliance according to the invention and to be able to use its properties and advantages.
  • HF changeover switches can be arranged in the bandpass filters so that the output signal of each bandpass filter can be routed to a shared HF-HF detector or to a plurality of dedicated HF-HF detectors, which can enable monitoring of the intended function of the bandpass filter during operation.
  • the aforementioned HF changeover switches can, if necessary, be skilfully combined with HF changeover switches which are present in a phase shifter which may be arranged downstream in the path.
  • a common type of phase shifter consists of lines of different lengths, via which the HF signal can be routed in a switchable manner, so that the desired HF phase shifts can be set in each case.
  • the HF switch at the input of the phase shifter can therefore be expanded to include a further switch position, which leads the HF signal to the HF detector for monitoring the bandpass filter.
  • the Safety-uC can check the bandpass filter in regularly recurring time intervals during operation and stop the HF generation in the event of an error. In this way, for example, the risk can be avoided that a software error can lead to an incorrectly set frequency on the HF signal generator. The RF signal would then be greatly amplified and a strong RF wave with the wrong frequency would enter the treatment room. However, since the microwave trap on the door of the treatment room is usually only designed for a permissible frequency range, in the event of a fault of this type an inadmissible amount of HF energy would escape from the device, so that the permissible limit values for HF fields would be exceeded. However, this case does not occur if the bandpass filter works correctly and the HF signal with the wrong frequency is sufficiently attenuated.
  • a further danger can be that the time between the occurrence of a defect in the bandpass filter and the error detection or the stopping of the HF generation is too long and permissible limit values are therefore exceeded. This danger can be avoided by inserting a redundant bandpass filter for each path after the monitored bandpass filter.
  • Another danger can be that, for example, a software error can lead to incorrect activation of the HF switch for monitoring the bandpass filter and thus the monitoring of the bandpass filter can be faulty, which means that permissible limit values are exceeded.
  • This danger can be avoided by inserting a redundant bandpass filter for each path after the monitored bandpass filter.
  • a high-frequency household appliance 1 is considered using the example of a high-frequency kitchen appliance 1 , which can be a microwave oven 1 , a microwave oven 1 or a Dialog cooker 1 , for example.
  • the high-frequency kitchen appliance 1 has an outer housing 10 which encloses and protects the components of the high-frequency kitchen appliance 1 from the outside.
  • a treatment chamber 11 is provided within the high-frequency kitchen appliance 1 and is enclosed or formed by a wall 12 . Between the outer housing 10 and the wall 12 of the treatment room 11 an intermediate space 13 is formed, which accommodates the electrical and electronic components of the high-frequency kitchen appliance 1 .
  • the treatment room 11 can be made accessible and closed by opening a closure element (not shown), for example in the form of a door or flap.
  • a cooking process of the high-frequency kitchen appliance 1 can be carried out in the treatment chamber 11, which can also be referred to as the interior 11, the cooking chamber 11 or the cavity 11.
  • the closure element when the closure element is open, food can be put into the treatment chamber 11 by a person as the user and the treatment chamber 11 can then be closed to the outside by closing the closure element.
  • the cooking process can be carried out solely by the energy of high-frequency electromagnetic waves, such as in a microwave oven 1, or also in addition to, for example, circulating air in a Dialog cooker 1.
  • the high-frequency energy in the form of high-frequency electromagnetic waves is generated by a high-frequency heating module 2 of the high-frequency kitchen appliance 1 , which is essentially arranged in the intermediate space 13 .
  • the high-frequency heating module 2 has precisely one high-frequency signal generator 21 which is designed to generate the high-frequency energy for the treatment room 11 .
  • the high-frequency energy generated is distributed equally to a plurality of, for example four, high-frequency paths 23a-23d as high-frequency feeds 23a-23d and is emitted into the treatment room 11 via the high-frequency paths 23a-23d.
  • Each of the four high-frequency paths 23a-23d has its own transition ANT in the form of an antenna ANT, which extends into the treatment room 11 and can therefore deliver or emit the respective portion of the high-frequency energy into the treatment room 11. This takes place at the frequency with which the high-frequency energy was generated by the high-frequency signal generator 21 .
  • multiple high-frequency paths 23a-23d can be implemented with just a single high-frequency signal generator 21.
  • the four high-frequency paths 23a-23d are of identical design and each have different electrical or electronic components or assemblies in the following order, which change the high-frequency energy between the high-frequency signal generator 21 and the respective transition ANT to the treatment room 11 and/or .or have other properties.
  • each high-frequency path 23a-23d first has an attenuator PGA which is designed to change the amplitude of the high-frequency energy.
  • a first bandpass filter BPF is then provided for each high-frequency path 23a-23d, which is formed is to transmit only a predetermined frequency range of radio frequency energy.
  • a phase shifter PHS follows, which is designed to change the phase of the high-frequency energy, followed by a second bandpass filter BPF, which is identical and therefore redundant to the first bandpass filter BPF.
  • a two-stage amplification of the high-frequency energy is performed by first using a high-frequency preamplifier PRE and then a high-frequency power amplifier HPA.
  • a high-frequency isolator ISO which is designed to block a backward-running high-frequency wave of the high-frequency energy emitted and thus to protect the high-frequency power amplifier HPA and the other preceding electronic components or electronic assemblies.
  • a high-frequency coupler CPL is then provided, which is designed to measure a forward-running and/or a backward-running high-frequency wave of the emitted high-frequency energy.
  • a harmonic filter HSF which is designed to block harmonics in a forward wave of high-frequency energy.
  • the high-frequency heating module 2 also has a central detector DET, which is connected to all four phase shifters PHS or to a high-frequency changeover switch of each phase shifter PHS and to a central safety unit 22 .
  • the detector DET is designed to detect at least one parameter of the high-frequency energy such as the frequency, the amplitude and/or the phase position of the electromagnetic wave of the high-frequency energy for each high-frequency path 23a-23d, which the first bandpass filter BPF to the respective phase shifter PHS toward leaves.
  • the respective high-frequency switches of the phase shifters PHS of the high-frequency paths 23a-23d are designed for this purpose, the high-frequency energy from the first bandpass filter BPF either the transition ANT to the treatment room 11 or the second bandpass filter BPF as the next electronic component on the way there or alternatively the Detector DET supply.
  • the latter takes place at predetermined, preferably equal, time intervals.
  • the safety unit 22 is designed to receive the at least one detected parameter from the detector DET and evaluate it with regard to compliance with at least one predetermined limit value, with the safety unit 22 being designed to switch off the high-frequency signal generator if a predetermined limit value of the parameter is exceeded.
  • the impermissible high-frequency energy or its electromagnetic wave can be prevented from being passed on into the treatment room 11, so that it does not reach the area surrounding the high-frequency kitchen appliance 1 from there .
  • Such an unacceptable property of the radio frequency energy may be in terms of amplitude or strength and/or in terms of frequency. Accordingly, the vicinity of the high-frequency kitchen appliance 1 can be protected from such high-frequency energy.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
EP22177704.8A 2021-07-12 2022-06-08 Appareil électroménager à haute fréquence, de préférence robot de cuisine à haute fréquence Pending EP4120798A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE20215540A BE1029581B1 (de) 2021-07-12 2021-07-12 Hochfrequenz-Haushaltsgerät, vorzugsweise Hochfrequenz-Küchengerät

Publications (1)

Publication Number Publication Date
EP4120798A1 true EP4120798A1 (fr) 2023-01-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22177704.8A Pending EP4120798A1 (fr) 2021-07-12 2022-06-08 Appareil électroménager à haute fréquence, de préférence robot de cuisine à haute fréquence

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EP (1) EP4120798A1 (fr)
BE (1) BE1029581B1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060191926A1 (en) * 2002-12-18 2006-08-31 Ray Ian C Microwave heating system
EP2475221A1 (fr) * 2009-09-03 2012-07-11 Panasonic Corporation Dispositif de chauffage à micro-ondes
EP2499505A1 (fr) 2009-11-10 2012-09-19 Goji Ltd Dispositif et procédé de régulation énergétique
US20130306627A1 (en) * 2011-02-11 2013-11-21 Goji Ltd. Interface for controlling energy application apparatus
US20150271877A1 (en) * 2014-03-21 2015-09-24 Whirlpool Corporation Solid-state microwave device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060191926A1 (en) * 2002-12-18 2006-08-31 Ray Ian C Microwave heating system
EP2475221A1 (fr) * 2009-09-03 2012-07-11 Panasonic Corporation Dispositif de chauffage à micro-ondes
EP2499505A1 (fr) 2009-11-10 2012-09-19 Goji Ltd Dispositif et procédé de régulation énergétique
US20130306627A1 (en) * 2011-02-11 2013-11-21 Goji Ltd. Interface for controlling energy application apparatus
US20150271877A1 (en) * 2014-03-21 2015-09-24 Whirlpool Corporation Solid-state microwave device

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BE1029581B1 (de) 2023-02-06
BE1029581A1 (de) 2023-02-03

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