BE1029581B1 - High-frequency household appliance, preferably high-frequency kitchen appliance - Google Patents

Abstract

The invention relates to a high-frequency household appliance (1) with at least one treatment chamber (11) which is designed to accommodate items to be treated with high-frequency energy, and with at least one high-frequency heating module (2) which is designed to supply the high-frequency energy generate and deliver into the treatment room (11), the high-frequency heating module (2) having at least: • at least one high-frequency signal generator (21), which is designed to generate the high-frequency energy, and • at least one transition (ANT) to Treatment room (11) of a first high-frequency path (23a-23d), which is designed to emit high-frequency energy into the treatment room (11), characterized in that the high-frequency heating module (2) also has at least: • at least one first bandpass filter ( BPF), which is designed to only let through a predetermined frequency range of the high-frequency energy, • at least one detector ( DET), which is designed to detect at least one parameter of the high-frequency energy, preferably the frequency, the amplitude and/or the phase angle of the electromagnetic wave of the high-frequency energy, • at least one safety unit (22), which is designed to detect the at least one to obtain detected parameters from the detector (DET) and to evaluate them with regard to compliance with at least one predetermined limit value, the high-frequency heating module (2) being designed to operate the high-frequency signal generator (21) depending on the evaluation of the parameter.

Description

Description

High-frequency household appliance, preferably high-frequency kitchen appliance

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 device

High-frequency household appliance according to claim 15.

It is known to heat materials using microwaves. Microwaves are electromagnetic waves with a frequency of about 1 to about 300 GHz, i.e. with

Wavelengths of about 30 cm to about 1 mm understood. Microwaves can excite molecules to 11 vibrations 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 chamber 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. Outside are usually farther

Display and control elements are provided, e.g. to check the power and the duration of the

To be able to set the process by a user. Between the outer casing and

Cooking space is formed in which usually at least one

Microwave generator is arranged, which can generate the microwaves and guide them through at least one corresponding high-frequency waveguide into the cooking chamber as a cavity. Originally, so-called magnetrons were used to generate microwave radiation, but nowadays electronic circuits such as transistors are used for this purpose.

Generally it is known between the HF module (high frequency module) as

Microwave generator and the treatment room of the microwave oven to use a coaxial line with appropriate coaxial connectors to lead the HF energy (high frequency energy) to the interior. The coaxial line can be formed together with an antenna, i.e. without any additional plug connection, and attached to the wall of the

be attached to the interior. For example, 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). Typical cross-sections of waveguides can be rectangular or oval, for example. At the wall of the interior, the HF waves (high-frequency waves) can run vertically via such waveguides and through a rectangular or oval, for example

Pass through the window of the interior wall and get into the interior.

The applicant is also aware of a type of kitchen appliance which is referred to as a “Dialog cooker”. 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, 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

However, the core of the food is comparatively short or little, since the heat must first spread from the outer layers to the core of the food during the cooking process.

In order to accelerate such cooking processes and/or to distribute the heat of the cooking process more evenly in the food than the food to be cooked, the further development of such conventional baking ovens into the Dialoggarer is known, which also generates electromagnetic waves with changing frequencies in the high-frequency spectrum, i.e.

HF waves, used to only heat the food being cooked and not its surroundings or the ambient air. This can be done very precisely or very specifically with regard to the heat that is to be additionally supplied to the food. This can lead to significant acceleration of the cooking process and improve the quality of the result of the cooking process.

Such devices for supplying radio frequency energy (RF energy) in a

The treatment room of a household appliance or a kitchen appliance provides its own HF signal generator for each path or for each feed. This allows the HF

To generate signals of the paths with different frequencies, which can be desirable for certain methods of heating or for certain heating programs.

The use of high-frequency energy in the form of electromagnetic waves in corresponding household appliances can have advantages for its intended use

provide use.

However, such electromagnetic waves of high-frequency energy for the

pose a risk in the vicinity of the high-frequency household appliance. This can interfere with other electronic devices. The health of living beings and in particular of the user of the high-frequency household appliance can also be endangered as a result.

EP 2 499 505 A1 describes devices and methods for using EM

energy on 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 s processor can also be configured to process any of the plurality

Associates modulation space elements with a corresponding time duration of power application based on the received information. 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. In particular, the propagation of impermissibly strong high-frequency energy ı5 And or high-frequency energy of impermissible frequencies in the vicinity of the

High-frequency household appliance can be reduced or even completely avoided.

In particular, it should be possible to comply with radio and EMC limit values. This should be done in particular for high-frequency kitchen appliances. At the very least, an alternative to known high-frequency household appliances of this type should be created.

According to the invention, this problem is solved by a high-frequency household appliance with the

Features of claim 1 and by a high-frequency heating module with the

Features of claim 15 solved. Advantageous configurations and

Further developments of the invention result from the following dependent claims.

Thus, the invention relates to a high-frequency household appliance, preferably a

High-frequency kitchen appliance, with at least one treatment chamber, which is designed to accommodate items to be treated with high-frequency energy, and with at least one high-frequency heating module, which is designed to generate the high-frequency energy and emit it into the treatment room, the high-frequency heating module has at least: * at least one high-frequency signal generator, which is designed to generate the high-frequency energy, and * at least one transition to the treatment room of a first high-frequency

Path, preferably in each case a transition to the treatment room of several

High-frequency path, which is formed, high-frequency energy in the

leave the treatment room.

Such a high-frequency household appliance can be any technical device that can be used in a household for household chores, the

Household work can be carried out additionally or solely by means of high-frequency (abbreviated: HF) energy. The high-frequency energy can be transmitted by means of electromagnetic waves

To be delivered to the treatment room in order to warm up or to heat a material to be treated there. Such high-frequency electromagnetic waves can in particular

Frequencies in the range from about 1 to about 300 GHz, i.e. wavelengths from about 30 cm to about 1 mm.

The implementation can be done, 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 additionally or solely for heating water or

Washing water or for drying wet laundry inside the washing drum

Treatment room can be used. As a high-frequency kitchen appliance, the high-frequency energy can be used in addition to or solely for cooking food in the cooking chamber as a ı5 treatment chamber. Such kitchen appliances can, for example

Microwave devices, ovens, dialog cookers or combi devices made of them.

The high-frequency household appliance according to the invention is characterized in that

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, the high-frequency heating module, further comprises at least: * at least one first bandpass filter, preferably of the first high-frequency

Path, which is designed to only let through a predetermined frequency range of the high-frequency energy, * at least one detector, which is designed to detect at least one parameter of the high-frequency energy, preferably the frequency, the amplitude and/or the

phase position of the electromagnetic wave of the high-frequency energy, and * at least one safety unit, which is designed to receive the at least one detected parameter from the detector and to evaluate it with regard to compliance with at least one predetermined limit value, the high-frequency heating module, preferably the safety unit, is trained, the

To operate high-frequency signal generator depending on the evaluation of the parameter, preferably the high-frequency signal generator when a predetermined is exceeded

switch off the limit value of the parameter.

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 restrictive effect on the high-frequency energy or on the corresponding 5 electromagnetic wave, which is generated by the transition of the corresponding

High-frequency path is delivered to or in the treatment room. Thus, the first bandpass filter can also be used to remove unwanted or impermissible frequencies below and above the passband on the forwarding or on the

Prevent spread into the treatment room. This can serve to protect the environment and in particular to comply with radio and EMC limit values.

To achieve this and to limit the propagation of radio frequency energy in the

To prevent treatment room with an undesirable or even unacceptable condition, the high-frequency energy after exiting the first

Bandpass filter fed to a detector, which is able to a parameter of the ı5 high-frequency energy such as in particular the frequency, the amplitude and/or the

To detect the phase position of the electromagnetic wave of the high-frequency energy and to supply 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.

If an undesirable or impermissible quality of the high-frequency energy or its electromagnetic wave is detected in this way, 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. In particular, the generation of the unwanted or impermissible high-frequency energy or its electromagnetic wave by the high-frequency signal generator can now

stay away 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.

According to the invention, the protection of the environment against electromagnetic waves of high-frequency energy can thereby be improved or even guaranteed. In particular, the

Propagation of impermissibly strong high-frequency energy and/or high-frequency

Reduced energy inadmissible frequency in the environment of the high-frequency household appliance or even completely avoided.

According to one aspect of the invention, the high-frequency heating module, preferably at least the first high-frequency path, particularly preferably several

High-frequency paths, most preferably all high-frequency paths, des

High-frequency heating module, a high-frequency switch, which is formed, the high-frequency energy from the first band-pass filter either the transition to

Treatment room or the detector to feed. As a result, the high-frequency energy can be temporarily or briefly taken from the "normal" transmission path or branched off and fed to the detector for the purpose of the evaluation described above. Incidentally, the high-frequency energy can be conducted further to the treatment room. This means that the evaluation and "normal" operation can be carried out alternatively.

According to a further aspect of the invention, 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 finding that such phase shifters 15 usually have a number of high-frequency changeover switches in any case in order to be able to carry out the intended function of the phase shifter. Accordingly, the cost of realizing a high-frequency switch can be kept comparatively low, as described above, by adding another phase shifter to the phase shifter

High-frequency switch is supplemented, which can temporarily supply the high-frequency energy to the detector as described above. This can keep the implementation effort low.

According to a further aspect of the invention, the detector is designed to detect the parameter of the high-frequency energy at predetermined, preferably equal, time intervals. This can be the temporary interruption of the actual, i.e. the "normal",

Enable transmission of the high-frequency energy to the treatment room in favor of the evaluation described above, as already mentioned above.

According to a further aspect of the invention, several high-frequency paths, preferably all 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 several high-frequency paths, preferably all high-frequency -Paths, have a common detector and/or a common security unit.

As a result, the aspects of the invention described above can be applied to several or to all

High-frequency paths of the high-frequency heating module are transmitted. In this case, 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. Alternatively, at least one detector and/or at least one safety unit can also be used for a plurality of high-frequency paths or for a single high-frequency path in each case, which can increase the scope for design.

According to a further aspect of the invention, at least one radio-frequency path, preferably several radio-frequency paths, particularly preferably all s radio-frequency paths, also has at least one second band-pass filter, which is designed redundantly with respect to the first band-pass filter, the second band-pass filter preferably behind is particularly preferably arranged 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 security feature to the

To take over the function of the first bandpass filter if the first bandpass filter does not work as intended. This can improve protection of the environment from an undesirable or impermissible nature of the high-frequency energy or its electromagnetic wave. According to one aspect of the invention, at least the first high-frequency path, preferably several high-frequency paths, particularly preferably all have high-frequency paths

High-frequency paths, furthermore: * at least one high-frequency power amplifier, preferably also at least one high-frequency preamplifier, which is designed to amplify the high-frequency energy.

As a result, within the high-frequency path or within the high-frequency

Feeding a power amplification of the local high-frequency electromagnetic

wave occur. This can be done in one or more stages to achieve higher performance.

According to a further aspect of the invention, at least the first high-frequency path, preferably several high-frequency paths, particularly preferably all

High-frequency paths, further on: * at least one high-frequency coupler, which is designed to measure a forward and/or backward running high-frequency wave of the high-frequency energy emitted, preferably between the high-frequency coupler and the transition no

Amplifier is arranged.

In this way, a forward and / or a reverse running

High-frequency wave of the emitted high-frequency energy detected and the detected

Data are evaluated in order, for example, to influence the generation of the high-frequency electromagnetic wave by the high-frequency signal generator and/or other electronic components within the respective high-frequency path. This can limit the design scope of high-frequency electromagnetic

Increase wave, which is released into the treatment room. Such a one

The high-frequency coupler can be designed, for example, as a 4-port coupler or as a 6-port coupler.

According to a further aspect of the invention, at least the first high-frequency path, preferably several high-frequency paths, particularly preferably all

High-frequency paths, furthermore: * at least one attenuator, which is designed to change the amplitude of the high-frequency energy.

As a result, in the course of the corresponding high-frequency path specifically influence the

Amplitude of the high-frequency electromagnetic wave can be taken.

According to a further aspect of the invention, at least the first high-frequency path, preferably several high-frequency paths, particularly preferably all

High-frequency paths, further on: * at least one phase shifter, which is designed to change the phase of the high-frequency energy.

As a result, in the course of the corresponding high-frequency path specifically influence the

Phase of the high-frequency electromagnetic wave are taken.

According to a further aspect of the invention, at least the first high-frequency path, preferably several high-frequency paths, particularly preferably all

High-frequency paths, further on: * at least one high-frequency isolator, which is designed to block a backward-running high-frequency wave of the emitted high-frequency energy, preferably between the high-frequency isolator and the junction no

Amplifier is arranged.

Such a high-frequency isolator can be used, for example, by means of a high-frequency

Circulator can be implemented with high-frequency load resistance. In any case, this can protect the electronic components of the corresponding high-frequency path against powerful backward running high-frequency waves of the emitted high-frequency

Energy allows to damage or destroy the electronic

To avoid components of the corresponding high-frequency path.

According to a further aspect of the invention, at least the first high-frequency path, preferably several high-frequency paths, particularly preferably all

High-frequency paths, further comprising: * at least one harmonic filter arranged to block harmonics in a forward wave of the high-frequency energy, preferably no amplifier is arranged between the harmonic filter and the transition.

In this way, corresponding harmonics in the forward running high-frequency wave ı5 of the emitted high-frequency energy can be avoided.

According to a further aspect of the invention, the high-frequency heating module has at least one control unit, which is designed to measure data of a forward and/or backward running

to obtain a high-frequency wave of the emitted high-frequency energy, preferably from a high-frequency coupler, and * to determine at least one amplitude and/or a phase of a forward running and/or a backward running high-frequency wave of the emitted high-frequency energy from the measurement data obtained.

The corresponding measurement data can be acquired, for example, by means of the high-frequency coupler described above, which for this purpose has circuits such as, for example, high-frequency detectors, ADCs (analog digital converters or analog

digital converter) and the like.

In any case, 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. about a

Food, via the radio frequency wave fields and via the radio frequency energy delivery.

This information can be used by the heating programs of the control unit in order to change the frequency of the high-frequency signal generator and, if necessary, of actuators of the respective high-frequency path such as attenuators and/or

To control phase shifters and thus to regulate the high-frequency power supply advantageous.

According to a further aspect of the invention, the control unit is also designed to have at least the high-frequency signal generator, preferably also at least one

Attenuator and/or a phase shifter of at least one high-frequency 10 path, preferably several high-frequency paths, particularly preferably all

To operate high-frequency paths as a function of the determined amplitude and/or the determined phase, preferably to change the frequency of the high-frequency energy. This can have a corresponding influence on the forward running

High-frequency wave of the emitted high-frequency energy are taken.

The present invention also relates to a high-frequency heating module for use in a high-frequency household appliance as described above. This allows a

High-frequency heating module are made available to an inventive

To realize high-frequency household appliance and to be able to use its properties and advantages.

In other words, according to the invention, a HF heating module with a separate processor (safety uC) or as a substitute for it with a process, with a program part or with a virtualized processor of the control unit (function uC) for monitoring its safe function during operation using implemented by monitoring the bandpass filter. HF switches can be arranged in the bandpass filters so that the

output of each bandpass filter to a common or several dedicated RF

RF detectors can be directed, which can allow 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, over which the HF signal can be routed in a switchable manner, so that the desired HF

Phase shifts can be adjusted. The HF switch at the input of the

phase shifter can thus be extended by a further switch position, which the HF

Signal leading to the RF detector for monitoring the bandpass filter.

In any case, 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

access 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.

Another danger can be that the length of time between the occurrence of a

defect in the bandpass filter and the error detection or stopping the HF generation is too large and the permissible limit values are exceeded. This danger ı5 can be reduced by inserting a redundant bandpass filter for each path behind the monitored one

Bandpass filters are avoided.

Another danger can be that e.g. a software error leads to a wrong

Activation of the HF switch for the monitoring of the bandpass filter and thus the monitoring of the bandpass filter can be faulty, which means that there is a

permissible limit values are exceeded. This danger can be avoided by inserting a redundant bandpass filter for each path after the monitored bandpass filter.

An embodiment of the invention is shown purely schematically in the drawings and is described in more detail below. It shows

Figure 1 is a schematic representation of an inventive high-frequency

household appliance; and

Figure 2 is a schematic representation of an inventive high-frequency

heating module of the high-frequency household appliance.

A high-frequency household appliance 1 according to the invention is illustrated using the example of a high-frequency

Considered kitchen appliance 1, which, for example, a microwave oven 1, a

Microwave oven 1 or a Dialoggarer 1 can be. 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. Inside the high-frequency kitchen appliance 1 is a

Treatment room 11 is provided, which is enclosed or formed by a wall 12 . Between the outer housing 10 and the wall 12 of the treatment room

11, a gap 13 is formed, which the electrical and electronic

Components of the high-frequency kitchen appliance 1 accommodates. The treatment room 11 can be opened by opening a closure element (not shown), for example in the form of a

Door or flap can be made accessible and closed.

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. For this purpose, when the closure element is open, a food as

Food to be cooked or as a good to be treated by a person as a user in the

Given treatment room 11 and the treatment room 11 then by closing the

Closure element are closed to the outside. The cooking process can be done solely by the energy of high-frequency electromagnetic waves such as in a

Microwave oven 1 or in addition to, for example, convection in a Dialoggarer 1 are carried out.

In any case, the high-frequency energy in the form of high-frequency ı5 electromagnetic waves is emitted by a high-frequency heating module 2 of the high-frequency

Kitchen appliance 1 generated, which is arranged in the space 13 substantially. The

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 generated high-frequency energy is distributed equally to several, for example four,

High-frequency paths 23a-23d distributed as high-frequency feeds 23a-23d and via the

High-frequency paths 23a-23d are released into the treatment room 11. Each of the four

High-frequency paths 23a-23d has its own transition ANT in the form of a

Antenna ANT, which extends into the treatment room 11 and can thus deliver or emit the respective proportion of the high-frequency energy into the treatment room 11 . This is done with the frequency at which the high-frequency

Energy was generated by the high-frequency signal generator 21. Thus, several

High-frequency paths 23a-23d can be realized with only 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 components in the following order.

Assemblies that transfer the high-frequency energy between the high-frequency

Change signal generator 21 and the respective transition ANT to the treatment room 11 and/or have other properties.

Thus, 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 designed to only let through a predetermined frequency range of the high-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.

Next, there is a two-stage amplification of the high-frequency energy, using first a high-frequency preamplifier PRE and then a high-frequency

Power amplifier HPA are used. This is followed by a high-frequency isolator ISO, which is designed to block a reverse high-frequency wave of the emitted high-frequency energy and thus the high-frequency power amplifier HPA and the other preceding electronic components or electronic

to protect 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. Finally, there is a harmonics filter

HSF configured 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 formed, at least one for each high-frequency path 23a-23d

To detect parameters 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, which leaves the first bandpass filter BPF for the respective phase shifter PHS. For this purpose, the respective high-frequency switch of the phase shifter PHS

High-frequency paths 23a-23d formed, 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. The latter takes place at predetermined, preferably equal, time intervals.

The security unit 22 is designed, the at least one detected parameter from

Detector DET to obtain and in terms of compliance with at least one predetermined

Evaluate limit value, wherein the security unit 22 is designed to

High-frequency signal generator when a predetermined limit value of the

disable parameters.

In this way, according to the invention, in the event of a malfunction of both the high-frequency

Signal generator 21 and the first bandpass filter BPF forwarding the impermissible high-frequency energy or its electromagnetic wave in the

Treatment room 11 are prevented in order not to get into the environment of s 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 environment of the high-frequency

Kitchen appliance 1 are protected from such high-frequency energy.

List of reference symbols (part of the description)

ADC analog to digital converter

ANT transitions or antennas to the treatment room 11

BPF bandpass filter

CPL high frequency coupler

DET detector

FDIV frequency divider

HPA high-frequency power amplifier; High power amplifiers

HSF harmonic filter; Harmony Suppression Filter 0 ISO High Frequency Isolator

MIX mixer

PGA (programmable) attenuator; programmable attenuator; Programmable

Gain Amplifier

PHS phase shifter

PRE high frequency preamp; Preamplifier

UIM voltage/current measurement 1 high-frequency household appliance; high-frequency kitchen appliance; microwave oven:

microwave oven; Dialog oven 10 exterior housing 11 treatment room; Inner space; cooking chamber; cavity 12 wall of the interior 11 13 intermediate space 2 high-frequency heating module 20 control unit; functional microcontroller 21 high-frequency signal generator 22 safety unit; security microcontrollers 23a-23d first through fourth high-frequency paths; first to fourth high-frequency feed

Claims (15)

patent claims 1. High-frequency household appliance (1), preferably high-frequency kitchen appliance (1), with at least one treatment chamber (11) which is designed to accommodate goods to be treated with high-frequency energy, and with at least one high-frequency heating module (2) which is designed to generate the high-frequency energy and to deliver it into the treatment room (11), the high-frequency heating module (2) having at least: e at least one high-frequency signal generator (21), which is designed to generate the high-frequency energy, and e at least one transition (ANT) to the treatment space (11) of a first high-frequency path (23a-23d), preferably one transition (ANT) each to the treatment space (11) of a plurality of high-frequency paths (23a-23d), which is designed for high-frequency energy deliver into the treatment room (11), characterized in that the high-frequency heating module (2), preferably at least the first high-frequency path (23a-23d), particularly preferably several High-frequency paths (23a-23d), very particularly preferably all high-frequency paths (23a-23d), of the high-frequency heating module (2), further having at least: e at least one first bandpass filter (BPF), preferably of the first high-frequency path ( 23a-23d), which is designed to only let through a predetermined frequency range of the high-frequency energy, e at least one detector (DET), which is designed to detect at least one parameter of the high-frequency energy, preferably the frequency, the amplitude and/or the phase position of the electromagnetic wave of high-frequency energy, and e at least one safety unit (22), which is designed to receive the at least one detected parameter from the detector (DET) and to evaluate it with regard to compliance with at least one predetermined limit value, the high-frequency heating module (2 ), Preferably the security unit (22) is formed, the high-frequency signal generator (21) in dependence to operate the evaluation of the parameter, preferably switching off the high-frequency signal generator (21) when a predetermined limit value of the parameter is exceeded. 2. High-frequency household appliance (1) according to claim 1, characterized in that the high-frequency heating module (2), preferably at least the first high-frequency path (23a-23d), particularly preferably a plurality of high-frequency paths (23a-23d), entirely particularly preferably all high-frequency paths (23a-23d) of the high-frequency heating module (2) have a high-frequency switch which is designed to transfer the high-frequency energy from the first bandpass filter (BPF) to either the transition (ANT) to the treatment room (11) or to the detector (DET). 3. High-frequency household appliance (1) according to claim 2, characterized in that the high-frequency switch is a high-frequency switch of a phase shifter (PHS), preferably a high-frequency path (23a-23d). 4. High-frequency household appliance (1) according to one of the preceding claims, characterized in that the detector (DET) is designed to detect the parameter of the high-frequency energy at predetermined, preferably equal, time intervals. 5. High-frequency household appliance (1) according to one of the preceding claims, characterized in that a plurality of high-frequency paths (23a-23d), preferably all high-frequency paths (23a- 23d), each have at least one first bandpass filter (BPF), wherein each of the radio-frequency paths (23a-23d) has a detector (DET) and/or a safety unit (22) or wherein several radio-frequency paths (23a-23d), preferably all radio-frequency paths (23a-23d), have a common detector (DET) and/or have a common security unit (22). 6. High-frequency household appliance (1) according to one of the preceding claims, characterized in that at least one high-frequency path (23a-23d), preferably several high-frequency paths (23a-23d), particularly preferably all high-frequency paths (23a-23d ), also has at least one second bandpass filter (BPF), which is redundant to the first bandpass filter (BPF), wherein the second bandpass filter (BPF) is preferably arranged behind, particularly preferably immediately behind, a phase shifter (PHS). 7. High-frequency household appliance (1) according to one of the preceding claims, characterized in that at least the first high-frequency path (23a-23d), preferably a plurality of high-frequency paths (23a-23d), particularly preferably all high-frequency paths (23a- 23d), furthermore has: e at least one high-frequency power amplifier (HPA), preferably also at least one high-frequency preamplifier (PRE), which is designed to amplify the high-frequency energy. 8. High-frequency household appliance (1) according to one of the preceding claims, characterized in that at least the first high-frequency path (23a-23d), preferably a plurality of high-frequency paths (23a-23d), particularly preferably all high-frequency paths (23a- 23d), further comprises: e at least one radio-frequency coupler (CPL), which is designed to measure a forward-running and/or a backward-running radio-frequency wave of the emitted radio-frequency energy, preferably between the radio-frequency coupler (CPL) and the transition (ANT) no amplifier (HPA, PRE) is arranged. 9. High-frequency household appliance (1) according to one of the preceding claims, characterized in that at least the first high-frequency path (23a-23d), preferably a plurality of high-frequency paths (23a-23d), particularly preferably all high-frequency paths (23a- 23d), furthermore has: e at least one attenuator (PGA), which is designed to change the amplitude of the high-frequency energy. 10. High-frequency household appliance (1) according to one of the preceding claims, characterized in that at least the first high-frequency path (23a-23d), preferably a plurality of high-frequency paths (23a-23d), particularly preferably all high-frequency paths (23a- 23d), further comprises: e at least one phase shifter (PHS), which is designed to change the phase of the high-frequency energy. 11. High-frequency household appliance (1) according to one of the preceding claims, characterized in that at least the first high-frequency path (23a-23d), preferably a plurality of high-frequency paths (23a-23d), particularly preferably all high-frequency paths (23a- 23d), further comprises: e at least one high-frequency isolator (ISO), which is designed to block a backward-running high-frequency wave of the emitted high-frequency energy, with preferably no amplifier between the high-frequency isolator (ISO) and the transition (ANT). (HPA, PRE) is arranged. 12. High-frequency household appliance (1) according to one of the preceding claims, characterized in that at least the first high-frequency path (23a-23d), preferably a plurality of high-frequency paths (23a-23d), particularly preferably all high-frequency paths (23a- 23d), further comprising: e at least one harmonics filter (HSF) which is designed to block harmonics in a forward wave of the high-frequency energy, with preferably no amplifier ( HPA, PRE) is arranged. 13. High-frequency household appliance (1) according to one of the preceding claims, characterized in that the high-frequency heating module (2) has at least one control unit (20) which is designed e to obtain measurement data of a forward and/or reverse RF wave of the emitted RF energy, preferably from a radio frequency coupler (CPL), and e from the obtained measurement data at least one amplitude and/or phase of a forward and/or reverse wave To determine high-frequency wave of the emitted high-frequency energy. 14. High-frequency household appliance (1) according to claim 13, characterized in that the control unit (20) is also designed to have at least the high-frequency signal generator (21), preferably also at least one attenuator (PGA) and/or a phase shifter (PHS) to operate at least one high-frequency path (23a-23d), preferably a plurality of high-frequency paths (23a-23d), particularly preferably all high-frequency paths (23a-23d), depending on the determined amplitude and/or the determined phase, preferably the Changing the frequency of the high-frequency energy. 15. High-frequency heating module (2) for use in a high-frequency household appliance (1) according to any one of the preceding claims.