WO2024218194A1 - Cooking system, cooking hob device, cookware and method of operating a cooking system - Google Patents

Abstract

The invention relates to a cooking system (10a), in particular an induction cooking system, having an insulation unit (12a) for thermal insulation of a set-down plate (14a) relative to a food receiving element (16a) and having a sensor unit (18a) for ascertaining the presence of the insulation unit (12a) on the set-down plate (14a) and in particular between the set-down plate (14a) and the food receiving element (16a). To increase the operational reliability and efficiency of the cooking system (10a), it is proposed that the sensor unit (18a) have at least one permanent magnet (28a) and be provided for ascertaining the presence of the insulation unit (12a) as a function of a magnetic field of the permanent magnet (28a).

Description

Cooking system, cooking hob device, cooking utensil and method for operating a cooking system

The invention relates to a cooking system according to the preamble of claim 1, a hob device according to claim 11, a cooking utensil according to claim 12 and a method for operating the cooking system according to claim 13.

An induction cooking system with an insulating base for thermally insulating a base plate from cooking utensils and with a sensor unit for detecting the presence of the insulating base, for example by means of an RFID transponder in the insulating base, is already known from the prior art. The electronic components required for such an RFID system have, in particular, poor heat resistance with regard to temperatures of 250°C to 300°C that can be reached on a surface of the base plate during certain cooking processes. In particular, such heat resistance cannot be provided for the desired, in particular required, small dimensions of such an RFID transponder. Furthermore, the positioning of the base can only be detected inaccurately by the cooking system using the RFID system, which leads to low operational reliability.

The object of the invention is in particular, but not limited to, providing a generic device with improved properties with regard to operational reliability and efficiency of the cooking system. The object is achieved according to the invention by the features of claims 1 and 13, while advantageous embodiments and further developments of the invention can be taken from the subclaims.

The invention is based on a cooking system, in particular an induction cooking system, with an insulation unit for thermally insulating a mounting plate from a food receiving element and with a sensor unit for determining a presence of the insulation unit on the mounting plate and in particular between the mounting plate and the food receiving element. It is proposed that the sensor unit has at least one permanent magnet and is intended to determine the presence of the insulation unit as a function of a magnetic field of the permanent magnet.

With such a design, the presence of the insulation unit can be determined particularly reliably, whereby in particular thermal damage to the installation plate can be advantageously avoided and operational reliability increased. Furthermore, an efficiency of the cooking system, in particular a heating efficiency, can be increased by thermal losses due to heat transfer from the food receiving element to the installation plate can be particularly reliably reduced or avoided. In addition, cost efficiency can be increased, in particular through a high availability of corresponding components. In particular, a particularly flexible and/or simple design of the cooking system can be achieved, whereby in particular a detection efficiency can be increased. Furthermore, a complexity of the insulation unit can advantageously be reduced and/or a heat resistance of the insulation unit can advantageously be increased.

A “cooking system” is to be understood as a system which has at least the insulation unit and the sensor unit, and which can additionally have at least one hob device, preferably an induction hob device, and/or the installation plate and/or the food receiving element and/or a cooking utensil, in particular comprising the food receiving element, and which is in particular intended for carrying out at least one cooking process. The hob device can be designed at least as a part, in particular at least as a subassembly, of a hob, in particular an induction hob, wherein in particular accessory units for the hob can also be included in the hob device. The hob device in particular has at least one heating unit, which preferably has at least one heating coil, in particular an induction heating coil, and which is intended for heating the food receiving element. The heating coil preferably has copper and/or aluminum. The heating unit preferably has at least one ferrite element and in particular a plurality of ferrite elements. Furthermore, the heating unit can have an electrically insulating plate and/or a housing, preferably made of aluminum, on an upper side. Preferably, the hob device has several heating units, which can also be arranged in the form of a matrix, for example, in particular to define a free cooking surface with a freely selectable installation position for cooking utensils. The hob device can in particular have a control unit at least for controlling and/or regulating the at least one heating unit. The hob device in particular comprises at least a part, preferably only a part, of the sensor unit. In particular, the hob device has at least one magnetic field sensor.

In an installation position, the hob device is arranged in particular below the installation plate. The installation plate is preferably designed as a kitchen worktop. Alternatively, the installation plate can also be designed as a hob plate, in which case the hob device and the hob plate can be part of a hob or can form one. In both cases, the installation plate can comprise any material or any combination of materials that appears to be appropriate to a person skilled in the art, or can consist of this material or this combination of materials. The installation plate could be made at least partially or at least to a large extent, in particular at least 55%, advantageously at least 65%, preferably at least 75%, particularly preferably at least 85% and particularly advantageously at least 95% of a volume and/or mass proportion of the installation plate, from glass and/or glass ceramic and/or from Neolith and/or from Dekton and/or from wood and/or from marble and/or from stone, in particular from natural stone and/or artificial stone, and/or from laminate and/or from metal and/or from plastic and/or from ceramic and/or from a composite material. The installation plate is preferably made from a non-metallic material. It would be conceivable for the installation plate to have engravings and/or prints, in particular for marking at least one heating zone for heating the food receiving element. However, the installation plate is preferably free of engravings and/or prints. The mounting plate is designed in the form of a plate and in particular has a material thickness which preferably corresponds to a maximum of 50%, preferably a maximum of 20%, particularly preferably a maximum of 10%, and particularly advantageously a maximum of 5% of a length and/or a width of the element, wherein the mounting plate in particular has opposite sides which have a flat, in particular smooth, surface. The mounting plate is in particular designed for mounting the food receiving element and the insulation unit, in particular at least one cooking utensil, in particular in particular a pot, a pan and/or the like, preferably for heating. Preferably, the kitchen worktop, in particular in contrast to the hob plate, is additionally provided to provide a food preparation area, in particular in that, for example, cutting and/or mixing and/or mashing and/or peeling of food can be carried out. In particular, the kitchen worktop is a piece of furniture, preferably a piece of kitchen furniture. The kitchen worktop is advantageously part of the kitchen and delimits and/or closes off in particular a part of an assembly of kitchen cabinets and/or kitchen furniture and/or other household appliances, such as a dishwasher and/or a washing machine and/or an oven, at the top. It would also be conceivable for the kitchen worktop to be, for example, a kitchen worktop in a commercial kitchen and/or an outdoor cooking landscape. This makes it possible to achieve a high level of operating comfort, for example through advantageous use of the kitchen worktop outside of an operating state of the heating unit, and in particular an advantageous appearance of the cooking system. For example, a particularly advantageous appearance can be achieved by making the installation plate, in particular the kitchen worktop or the hob plate, a kitchen floor and kitchen walls from similar materials. The temperatures reached on the surface of the installation plate during certain cooking processes can be high and in particular over 250°C. The material of the installation plate can have poorer thermal and mechanical properties than a conventional hob plate, in particular made of glass ceramic, whereby thermal damage, in particular due to uneven thermal expansion from heat concentrated on the heating zone of the installation plate emanating from the food receiving element, can advantageously be avoided by the insulation unit. In particular, mechanical stresses which are higher than the breaking strength of the installation plate can advantageously be avoided.

The food receiving element can be designed, for example, as at least one component of a pot and/or a pan and/or a roasting pan. In particular, the food receiving element can be arranged in a cooking surface area on the installation plate. The food receiving element is in particular intended for inductive heating, in particular by means of the heating unit. It is conceivable that the insulation unit is part of a cooking utensil which also contains the food receiving element. element, wherein the insulation unit is arranged in particular beneath the food receiving element and connected to it. This makes it possible to achieve particularly simple alignment of the food receiving element and the insulation unit in a set-up state, in which in particular the insulation unit is arranged between the set-up plate and the food receiving element set up on the set-up plate. Furthermore, operational reliability can be advantageously increased, in particular in that the insulation unit can only be forgotten by selecting unsuitable cooking utensils. It is conceivable that the food receiving element is formed in one piece with the insulation unit. The term “in one piece” is to be understood in particular as being connected in a material-locking manner, such as by a welding process and/or gluing process, etc., and particularly advantageously as being molded onto the insulation unit, such as by being manufactured from a single cast and/or by being manufactured in a single or multi-component injection molding process. Preferably, a material of the food receiving element differs at least partially from a material of the insulation unit, whereby in particular a heating efficiency of the food receiving element and a thermal insulation of the insulation unit can be advantageously increased. Alternatively or additionally, it is conceivable that the food receiving element is connected to the insulation unit in a force-fitting and/or form-fitting manner, such as by means of plug connections and/or rotary connections and/or screw connections.

Alternatively, in a further embodiment, it would be conceivable that the insulation unit is designed separately from a cooking utensil that includes the food receiving element. In this case, the insulation unit is designed to be separable from, and in particular movable relative to, the food receiving element, in particular the cooking utensil. The insulation unit can be designed as a base unit, in particular to be placed underneath the food receiving element when the food receiving element, in particular the cooking utensil, is placed on the installation plate. This can advantageously increase the flexibility of the cooking system, in particular by allowing a conventional cooking utensil, in particular induction cooking utensil, to be safely heated without an integrated insulation unit and/or replacing a defective cooking utensil and/or a defective insulation unit more quickly and/or more cost-effectively. In this case, the food receiving element and the insulation unit can preferably only be connected by placing the food receiving element on the insulation unit, in particular by a gravity and/or a supporting force of the mounting plate below the isolation unit.

The insulation unit is preferably provided to provide a distance, which in particular corresponds to a thickness of the insulation unit, between the installation plate and the food receiving element. The insulation unit preferably has a thickness of at least 1 mm, preferably at least 2 mm, and particularly preferably at least 3 mm and/or a maximum of 10 mm, preferably at most 8 mm and particularly preferably at most 6 mm. The insulation unit, at least in the installed state, in particular provides a volume between the installation plate and the food receiving element, which is preferably at least partially filled with air, in particular to at least 30%, advantageously at least 40%, preferably at least 50%, particularly preferably at least 60% and particularly advantageously at least 70% of the volume, whereby in particular thermal insulation can be effectively provided. Alternatively or additionally, it is conceivable that the volume between the support plate and the food receiving element is filled at least to a large extent, in particular to at least 55%, advantageously at least 65%, preferably at least 75%, particularly preferably at least 85% and particularly advantageously at least 95% of the volume by the insulation unit, in particular by at least one material and/or element of the insulation unit. The insulation unit can in particular comprise a thermally insulating material, for example glass fiber and/or silicone and/or aerogel and/or the like. This can provide particularly effective thermal insulation. The insulation unit can be designed in the form of a plate.

Preferably, in the set-up state, only one insulation unit is assigned to only one food receiving element. In particular, only one food receiving element is arranged on the insulation unit in the set-up state and only one insulation unit is arranged between the set-up plate and the one food receiving element. The cooking system can comprise at least one further insulation unit, which in the set-up state is preferably assigned to at least one further food receiving element, and in particular is intended for arrangement between the set-up plate and the further food receiving element of the cooking system. The insulation unit preferably has a Top side with a size that correlates to a size of an area of a bottom side of the food receiving element. The further insulation unit preferably has a further top side with a size that correlates to a size of an area of a further bottom side of the further food receiving element. Alternatively, it is conceivable that in the set-up state more than one food receiving element is arranged on a single insulation unit or more than one insulation unit is arranged between the set-up plate and the one food receiving element.

The sensor unit is at least intended to record at least one parameter and/or one physical property. The sensor unit preferably comprises at least one computing unit, in particular at least one microprocessor, and/or a memory unit, by means of which measured signals can be at least partially processed. Alternatively, it would be conceivable for the measured signals to be partially processed by the control unit. In particular, it would be conceivable for the control unit to have the computing unit and/or the memory unit.

The cooking system, in particular the hob device, preferably has at least one additional sensor unit, in particular for determining a temperature of the food receiving element. The additional sensor unit can detect the temperature in a known manner, for example by means of an IR temperature measurement. The additional sensor unit preferably has at least one IR radiation source and at least one IR radiation detector for detecting IR radiation reflected from the food receiving element and emitted by the IR radiation source. The IR radiation detector and/or the IR radiation source of the additional sensor unit is/are preferably arranged, in particular on an electronic circuit board, under and/or in a recess in the middle of the heating unit below the installation plate. The recess of the heating unit preferably extends along the normal direction of the installation plate from a top side to a bottom side of the heating unit. The installation plate preferably has a window and/or the insulation unit has a window. The window of the mounting plate and/or the window of the insulation unit is/are particularly permeable to at least a large extent to at least the IR radiation of the additional sensor unit and the reflected IR radiation, wherein the window of the mounting plate and/or the insulation unit is particularly permeable to a transmission of at least 55%, advantageously at least 65%, preferably at least 75%, particularly preferably at least 85% and particularly advantageously at least 95% of the IR radiation is/are provided. In particular, the window of the support plate and/or the window of the insulation unit is/are provided for low-loss transmission of the IR radiation. As a result, a temperature and/or a temperature profile of the food receiving element can be measured particularly efficiently by the additional sensor unit. The window of the support plate preferably extends at least partially along the normal direction of the support plate from a top side to a bottom side of the support plate and can be introduced into the support plate in particular by a suitable shaping process either directly during production of the support plate, for example by means of a suitable casting mold, or subsequently, for example by means of a drilling process or a milling process or the like. A “normal direction” of an object is to be understood as a direction which runs perpendicular to a main extension plane of the object. A “main extension plane” of a structural unit is to be understood as a plane which is parallel to a largest side surface of a smallest imaginary cuboid which just completely encloses the structural unit and in particular runs through the centre of the cuboid.

It is conceivable that the window of the mounting plate and/or the insulation unit has a radiation transmission element. A radiation transmission element is to be understood as an element which is at least partially permeable to electromagnetic radiation and which transmits electromagnetic radiation at least in the longitudinal direction of the radiation transmission element. It is conceivable that the radiation transmission element at least partially prevents the entry and/or exit of electromagnetic radiation in directions aligned at least substantially perpendicular to the longitudinal direction of the radiation guide element. The radiation transmission element preferably has a temperature resistance of at least 250°C. The radiation transmission element could be made at least largely, in particular completely, from quartz. Alternatively or additionally, the radiation guide element could have at least one thermoplastic material and in particular be made at least largely from such a material. Alternatively, it is conceivable that the window of the mounting plate and/or the insulation unit is/are designed as an opening which is in particular free of elements and/or units, in particular the radiation transmission element. It is conceivable that the window of the installation plate is at least intended to enable a particularly low-loss transmission of visible light from a lighting unit of the cooking system, in particular the hob device, from an area below the installation plate to an area above the installation plate. The heating zone for heating the food receiving element could be made visible to an operator by means of the lighting unit. The window of the installation plate preferably forms a partial area of the installation plate, wherein the window of the installation plate can in particular have a diameter of a maximum of 10 cm, preferably at most 8 cm, preferably a maximum of 5 cm and particularly preferably a maximum of 2 cm and/or a minimum of 1 mm, preferably at least 5 mm and preferably at least 1 cm. It is conceivable that the installation plate has further windows, which are designed in particular analogously to the window of the installation plate and are each assigned to a further heating zone and/or the further heating unit.

The window of the insulation unit preferably extends at least partially along a normal direction of the insulation unit and from a top side to a bottom side of the insulation unit. In the set-up state, the normal direction of the insulation unit preferably runs parallel to the normal direction of the set-up plate.

The term "intended" should be understood as specifically programmed, designed and/or equipped. The fact that an object is intended for a specific function should be understood in particular to mean that the object fulfills and/or executes this specific function in at least one application and/or operating state.

The cooking system preferably has further sensor units, which are designed in particular analogously to the sensor unit, which are each assigned in particular to a further heating zone and/or to the at least one further heating unit. The cooking system can also have further additional sensor units, which are designed in particular analogously to the additional sensor unit and which can each be assigned in particular to a further heating zone and/or to the further heating unit.

The determination of the presence of the insulation unit as a function of the magnetic field of the permanent magnet is in particular a determination of the presence of the insulation unit as a function of a determined magnetic field strength, in particular a magnetic flux density of the permanent magnet. The magnetic field of the permanent magnet is in particular a constant field.

It is further proposed that the cooking system has a heating unit, in particular the heating unit mentioned above, and a control unit, in particular the control unit mentioned above, which blocks or enables operation of the heating unit based on a signal from the sensor unit. In particular, the control unit is intended to block operation, in particular heating operation, of the heating unit for a detected absence, in particular a lack of presence, of the insulation unit. It is conceivable that the control unit is intended to transmit a notification signal, in particular an error signal and/or a warning signal, to the user at least for the detected absence of the insulation unit. The notification signal could be displayed optically, for example, in particular on a user interface. The control unit is in particular intended to enable operation of the heating unit for the detected presence of the insulation unit. This can ensure thermal insulation of the food receiving element with respect to the installation plate for the operation of the heating unit, whereby in particular increased heating efficiency and increased operational reliability can be reliably provided.

Furthermore, the control unit is preferably provided for controlling and/or regulating the heating unit based on a signal from the additional sensor unit, whereby in particular operational reliability and/or ease of use can be further increased, in particular by at least partially automatic regulation of an advantageous temperature of the food receiving element and/or by blocking operation of the heating unit if the temperature of the food receiving element is estimated to be too high.

It is further proposed that the permanent magnet is integrated in the insulation unit. In particular, the permanent magnet is fixed in the insulation unit. This makes it particularly advantageous to determine the presence of the insulation unit based on the magnetic field of the permanent magnet. In particular, a distance of the insulation unit from the installation plate correlates to a magnetic field strength at a fixed position in the cooking system. Advantageously, a particularly compact insulation unit can be provided. In particular, the insulation unit has the permanent magnet and a holder. The permanent magnet is preferably integrated in the holding unit and in particular fixed in and/or on the holding unit. The permanent magnet is preferably at least partially accommodated in the holding unit. The holding unit can comprise a thermally insulating material. It is conceivable that the permanent magnet is completely accommodated in the holding unit. As a result, the permanent magnet can be advantageously thermally insulated, in particular by the holding unit, as a result of which a temperature of the permanent magnet in heating mode can be particularly advantageously reduced. It is conceivable that the holding unit comprises a plastic and/or is made of a plastic.

It is also proposed that a north-south direction of the permanent magnet is at least substantially perpendicular to a top and/or bottom of the insulation unit, wherein the north-south direction deviates from a direction perpendicular to the top and/or bottom by in particular less than 20°, preferably less than 10°, particularly preferably less than 5° and particularly advantageously less than 3°. As a result, the magnetic field strength present at the sensor unit, in particular the magnetic flux density, can be advantageously increased, whereby in particular a signal strength and/or a reliability of determining the presence of the insulation unit can be advantageously increased.

The top side of the insulation unit is in particular intended for contact with the food receiving element. The bottom side of the insulation unit is in particular intended for contact with the installation plate. In the installation state, the top side and/or the bottom side of the insulation unit preferably each have a surface, in particular a surface averaged over each point on the top side and/or bottom side of the insulation unit, parallel to the main extension direction of the installation plate. The north-south direction preferably runs at least substantially perpendicular to the normal direction of the insulation unit. The north-south direction preferably runs at least substantially perpendicular to the normal direction of the installation plate, at least in the installation state.

The north-south direction is in particular a direction, in particular along a shortest straight line, from a north pole of the permanent magnet to a south pole of the permanent magnet. In particular, the permanent magnet has a uniform north-south direction, wherein in particular an orientation of the north-south direction is aligned the same at every point of the permanent magnet. Preferably, a north pole of the permanent magnet, in particular at least with respect to the top and/or the bottom of the insulation unit, is arranged above the south pole of the permanent magnet. The north-south direction preferably runs at least substantially perpendicular to a largest side surface of the permanent magnet.

It is further proposed that the sensor unit has at least one further permanent magnet which is integrated in the insulation unit, wherein the further permanent magnet has a north-south direction parallel to the north-south direction of the permanent magnet. In particular, an orientation of the north-south direction of the further permanent magnet corresponds to the orientation of the north-south direction of the permanent magnet. As a result, the magnetic field strength present at the sensor unit, and thus in particular the reliability of determining the presence of the insulation unit, can be increased particularly advantageously. Preferably, the further permanent magnet is designed to correspond to the permanent magnet. Preferably, the further permanent magnet is arranged offset from the permanent magnet, in particular integrated in the mounting unit, in particular with respect to a viewing direction perpendicular to the top and/or bottom of the insulation unit. Preferably, the permanent magnet and the further permanent magnet are arranged in a common plane, in particular the main extension plane of the insulation unit.

It is further proposed that the sensor unit has a plurality of permanent magnets which are integrated in the insulation unit and which are arranged evenly along a circumference of the insulation unit. This makes it possible to provide a particularly advantageous magnetic field strength and in particular a particularly uniform magnetic field, whereby in particular a particularly precise and/or reliable determination of a positioning of the insulation unit on the mounting plate can be achieved. In particular, the plurality of permanent magnets comprises the permanent magnet and the further permanent magnet. Preferably, the permanent magnets are designed the same. Preferably, the permanent magnets are each designed according to the permanent magnet. Preferably, the permanent magnets are evenly offset from one another, in particular with respect to a viewing direction perpendicular to the top and/or bottom of the insulation unit, in particular integrated in the holder unit. Preferably, the permanent magnet and the further permanent magnet are arranged in a common plane, in particular the main extension plane of the insulation unit.

It is conceivable that the insulation unit, in particular at least with respect to the viewing direction perpendicular to the top and/or bottom of the insulation unit, has a rectangular or elliptical circumference or a circumference shaped according to another shape that appears reasonable to the person skilled in the art. The insulation unit is preferably designed in the shape of a circular ring, in particular at least with respect to the viewing direction perpendicular to the top and/or bottom of the insulation unit, whereby a particularly advantageous and in particular particularly uniform magnetic field can be provided. Alternatively or additionally, it would be conceivable for the permanent magnets to have a different arrangement, for example along a center of the insulation unit.

A shape of the permanent magnet, in particular the permanent magnets, is preferably adapted at least to the shape of the insulation unit. For a circular ring-shaped insulation unit, the permanent magnet preferably has the shape of a circular ring cutout. This allows the permanent magnets to be arranged advantageously and in particular compactly in the insulation unit.

The insulation unit preferably has an arrangement radius of the permanent magnets of at least 10 mm, preferably at least 20 mm and particularly preferably at least 30 mm and/or a maximum of 90 mm, preferably a maximum of 80 mm and particularly preferably a maximum of 70 mm. The arrangement radius runs in particular from a center of the insulation unit to a side surface of the permanent magnet facing the center of the insulation unit. A number of permanent magnets in the insulation unit is in particular at least 1, preferably at least 2, preferably at least 5 and particularly preferably at least 7 and/or preferably a maximum of 30, preferably a maximum of 25 and particularly preferably a maximum of 20. In particular, the number of permanent magnets in the insulation unit can be adapted to the shape, in particular to the arrangement radius, of the insulation unit. In particular, a magnetic field strength can be advantageously increased for a particularly small arrangement radius and a particularly high number of permanent magnets. In a particularly advantageous embodiment of the invention, the arrangement radius can be in particular exactly 65 mm, whereby in particular a magnetic field strength can be optimized for compact dimensions of the insulation unit. The arrangement radius can be exactly 60 mm for example for at least a first embodiment, in particular for at least a first size, of the food receiving element, wherein the insulation unit in particular has a maximum number of 19, advantageously exactly 13, permanent magnets. The arrangement radius can be exactly 35 mm for example for at least one further embodiment, in particular for at least one smaller embodiment compared to the first embodiment, wherein the insulation unit in particular has a maximum number of 12, advantageously exactly 8, permanent magnets.

It is also proposed that the sensor unit has at least one magnetic field sensor, in particular the magnetic field sensor mentioned above. The magnetic field sensor is provided in particular for determining the magnetic field strength, in particular a magnetic flux density, of the permanent magnet and/or the permanent magnets, in particular at the position of the magnetic field sensor. It would be conceivable for the magnetic field sensor to be designed as an electronic compass (eCompass). Alternatively, it would be conceivable for the magnetic field sensor to be designed as a magnetic switch or the like.

The magnetic field sensor is particularly intended for measuring a constant magnetic field. The magnetic field sensor is preferably intended for determining a magnetic flux density, particularly in a range of microtesla to millitesla. The magnetic field sensor preferably has a high temperature resistance, particularly even at temperatures of 105°C.

The magnetic field sensor is preferably designed as a Hall sensor, which in particular makes it possible to provide a particularly precise determination of the magnetic field strength and/or an advantageously compact design of the magnetic field sensor and/or advantageous heat resistance. Alternatively, another design of the magnetic field sensor, known in particular to the person skilled in the art, would be conceivable, which in particular has at least the properties mentioned above.

The magnetic field sensor is preferably designed to measure the magnetic field at least once, which is arranged in particular between an operator input for triggering the heating operation of the heating unit and the start of the heating operation. net or is carried out in a heating mode of the heating coil. The magnetic field sensor can be provided for a continuous determination of the magnetic field, in particular at least during the heating mode. A temporal periodicity of the continuous determination can be, for example, one millisecond, whereby in particular magnetic fields with a frequency above 1 kHz, in particular emanating from the heating coil, can advantageously be filtered out.

It is conceivable that the magnetic field sensor is provided for determining only a one-dimensional vector component of the magnetic field. Preferably, the magnetic field sensor is provided for determining more than one vector component of the magnetic field. Preferably, the magnetic field sensor is designed as a 3D magnetic field sensor, which in particular determines a three-dimensional magnetic field strength of the magnetic field. This can advantageously increase the precision of determining the magnetic field strength. Preferably, the magnetic field sensor is a 3D Hall sensor. Furthermore, it is conceivable that the sensor unit has at least one further magnetic field sensor, which is arranged in particular at a distance from the magnetic field sensor. Preferably, the further magnetic field sensor is a 3D magnetic field sensor, in particular a 3D Hall sensor.

The number of permanent magnets in the insulation unit, and thus in particular a magnetic field strength provided by the insulation unit at the position of the magnetic field sensor in the installed state, can in particular be adapted to a minimum magnetic field strength that can be determined by the magnetic field sensor.

The sensor unit is preferably arranged partially under the installation plate. In particular, it is proposed that the cooking system has the installation plate and the magnetic field sensor is arranged under the installation plate, whereby a particularly advantageous appearance and/or a particularly compact structure of the cooking system can be achieved. In particular, the magnetic field sensor can be advantageously protected, for example, from food and/or liquids and/or other external influences. Furthermore, the magnetic field sensor can be arranged at a position of advantageous magnetic field strength in the installation state. It is conceivable that the sensor unit, apart from the permanent magnet, in particular at least the computing unit and/or the storage unit and/or the like, is arranged under the installation plate. It is conceivable that the magnetic field sensor is arranged under and/or in the recess in the middle of the heating unit, in particular on the electronic plate, whereby in particular shielding of the magnetic field of the permanent magnet between the permanent magnet and the magnetic field sensor can be reduced and/or avoided. In particular, the magnetic field sensor can be arranged centered within the insulation unit at least with respect to a viewing direction parallel to the normal direction of the mounting plate. Alternatively, it is conceivable that the magnetic field sensor and/or a plurality of magnetic field sensors are arranged outside the recess in the middle of the heating unit. In such an embodiment, the magnetic field sensor and/or the plurality of magnetic field sensors is/are arranged between the ferrite elements of the heating unit, in particular distributed over a surface of the heating unit, in particular at least with respect to a viewing direction parallel to the normal direction of the mounting plate. As a result, shielding of the magnetic field of the permanent magnet, in particular by the ferrite elements, between the permanent magnet and the magnetic field sensor can be advantageously reduced and/or avoided, whereby in particular an advantageous distribution of the magnetic field sensors below the permanent magnet can be achieved. It is conceivable that the three magnetic field sensors are each arranged on a corner of a triangle, in particular an equilateral triangle, whereby the magnetic field sensors in particular have an at least substantially equal distance from the center of the heating unit, whereby the distances of the individual magnetic field sensors from the center deviate from one another in particular by less than 25%, preferably less than 10% and particularly preferably less than 5% from an average distance between the magnetic field sensors and the center. Alternatively, it is conceivable that the sensor unit has three magnetic field sensors which are arranged linearly to one another and in particular to a center of the heating unit, whereby in particular an advantageous magnetic field strength and/or a more compact arrangement of the magnetic field sensors, in particular on the electronic circuit board, can be provided, in particular compared to the arrangement of the magnetic field sensors at the corners of the triangle.

The sensor unit is preferably provided to determine the presence of the insulation unit as a function of the magnetic field strength determined by the at least one magnetic field sensor. It is further proposed that the sensor unit is provided to compare a magnetic field strength determined by the magnetic field sensor with a reference magnetic field strength. This allows the presence of the insulation unit to be determined in a particularly simple and efficient manner.

It is conceivable that the sensor unit is provided for a vectorial comparison, in particular for a single comparison of several vectorial components of a vector of the magnetic field strength with corresponding vectorial components of the reference magnetic field strength. Alternatively, it is conceivable that only a scalar component, in particular a one-dimensional magnetic field strength, of the magnetic field is compared with a corresponding reference magnetic field strength. Preferably, the sensor unit is provided for a comparison of a, in particular scalar, vector magnitude of the magnetic field strength with a corresponding reference value. The vector of the magnetic field strength is preferably determined by the 3D magnetic field sensor. It is conceivable that the sensor unit has more than one magnetic field sensor, in particular more than one 3D magnetic field sensor, and is provided for a comparison of the magnetic field strength determined by a respective magnetic field sensor with a respective reference magnetic field strength. Alternatively, it is conceivable that the sensor unit has more than one magnetic field sensor, in particular more than one 3D magnetic field sensor, and is provided for comparing a calculated magnetic field strength calculated from the multiple magnetic field strengths of the multiple magnetic field sensors with a corresponding reference magnetic field strength.

Preferably, the reference magnetic field strength is stored in the sensor unit, in particular in the storage unit. It would be conceivable that the reference value is already stored in the sensor unit before the cooking system is assembled. Alternatively, it would be conceivable that the reference value can be determined and/or calculated and stored by means of an input from an operator and/or an installer. It is also conceivable that the sensor unit is provided for determining the reference value for a calibration operation, in particular carried out by an installer and/or an operator, wherein the cooking system is in particular already assembled for the calibration operation. In this way, the reference magnetic field strength can advantageously be adapted to the boundary conditions of the cooking system, in particular, for example, to a thickness of the installation plate and/or to a distance of the detection coil from the installation plate and/or to properties of the insulation unit or the like. Preferably The sensor unit is designed to determine the reference magnetic field strength in the installation state.

The control unit is preferably designed to block the operation of the heating unit for the magnetic field strength smaller than the reference magnetic field strength. The control unit is preferably designed to enable the operation of the heating unit for the magnetic field size greater than or equal to the reference magnetic field strength.

In calibration mode, the sensor unit can be provided to calibrate the magnetic field sensor, in particular to determine the magnetic field strength. In calibration mode, the sensor unit can be provided to determine an offset, in particular due to a thermal drift and/or a lifetime drift and/or an offset drift of the component itself and/or due to the earth's magnetic field and/or the like, and in particular to calculate, in particular by means of the computing unit, the offset with a determined sensor signal and/or a determined magnetic field strength. This can advantageously prevent a false-positive detection result of the insulation unit and in particular increase operational reliability.

Alternatively, it would be conceivable that the sensor unit is provided for determining the presence of the insulation unit by comparing a characteristic value deviating from the magnetic field strength, for example a Hall voltage or a distance calculated from the magnetic field strength between the magnetic field sensor and the insulation unit or the like, and a corresponding reference value.

The permanent magnet preferably comprises a material which has a temperature resistance, in particular a stable magnetization, at temperatures of 250°C and in particular 300°C, which are present at least for a short time. It is proposed that the permanent magnet comprises samarium cobalt and/or neodymium. This can advantageously increase a temperature resistance and/or a magnetic field strength of the permanent magnet.

In addition, a method for operating a cooking system with an insulation unit, in particular mentioned above, for thermally insulating a mounting plate, in particular mentioned above, from a food receiving element, in particular mentioned above, is proposed, wherein a presence of the insulation unit on the Installation plate and in particular between the installation plate and the food receiving element is determined at least partially automatically and the presence of the insulation unit is determined depending on a magnetic field of a permanent magnet, in particular mentioned above, of the sensor unit. In this way, the presence of the insulation unit can be determined particularly reliably, whereby in particular thermal damage to the installation plate can be advantageously avoided and operational reliability can be increased. Furthermore, an efficiency of the cooking system, in particular a heating efficiency, can be increased by thermal losses due to heat transfer from the food receiving element to the installation plate can be particularly reliably reduced or avoided. In addition, cost efficiency can be increased, in particular through a high availability of corresponding components. In particular, a particularly flexible and/or simple design of the cooking system can be achieved, whereby in particular a determination efficiency can be increased. Furthermore, a heat resistance of the insulation unit can be advantageously increased. The partially automatic determination comprises in particular at least one manual step, for example an operator input on an operator interface of the cooking system, at the start of a heating operation of a heating unit, and at least one automatic step, for example an automatic determination of the presence of the insulation unit following the operator input. It is conceivable that the presence of the isolation unit is determined fully automatically.

The method preferably has a method step, in particular a detection step, in which a magnetic field sensor determines a magnetic field, in particular a magnetic field strength. The magnetic field strength is preferably compared with a reference magnetic field strength, in particular a stored one, in a further method step, in particular in a calibration step, which is arranged in particular after the detection step. The method preferably has a further method step, in particular an actuation step, which is arranged in particular after the calibration step. In the actuation step, a heating unit of the cooking system is preferably actuated depending on the result of the comparison in the calibration step.

The cooking system, the cooking hob device, the cooking utensils and the method for operating the cooking system are not intended to be limited to the application and use described above. embodiment may be limited. In particular, the cooking system, the hob device, the cooking utensil and the method for operating the cooking system may have a number of individual elements, components, units and method steps that differs from a number stated herein in order to fulfill a function described herein.

Further advantages emerge from the following description of the drawing. The drawing shows embodiments of the invention. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will also expediently consider the features individually and combine them into further useful combinations.

They show:

Fig. 1 a cooking system in a schematic plan view,

Fig. 2 a section of the cooking system with a sensor unit and an insulation unit, wherein the sensor unit has a permanent magnet and a magnetic field sensor, in a schematic side view,

Fig. 3 a part of the insulation unit in a schematic plan view,

Fig. 4 an exemplary embodiment of the permanent magnet,

Fig. 5 is a flow chart for operation of the cooking system,

Fig. 6 an alternative embodiment of a spatial arrangement of magnetic field sensors in a cooking system and

Fig. 7 shows another alternative embodiment of a spatial arrangement of magnetic field sensors in a cooking system.

Figure 1 shows a cooking system 10a in a schematic plan view. The cooking system 10a is designed as an induction cooking system. The cooking system 10a comprises a support plate 14a. The support plate 14a is intended for setting up at least one cooking utensil 46a of the cooking system 10a. In the present case, the support plate 14a is designed as a kitchen worktop 92a. Alternatively, the support plate 14a could also be designed as a hob plate (not shown).

The installation plate 14a has at least one heating zone 64a in which the cooking utensil 46a can be arranged in an installation state for heating. The cooking utensil 46a is designed here as a pot, for example. The cooking system 10a has a user interface 68a which is integrated in the support plate 14a. By means of the user interface 68a, at least the heating of the cooking utensil 46a can be controlled and/or regulated by an operator.

Figure 2 shows a section of the cooking system 10a in a set-up state in a schematic side view. The cooking system 10a has an insulation unit 12a for thermally insulating the set-up plate 14a from a food receiving element 16a.

In the installed state, the insulation unit 12a is intended to provide a distance 24a, which corresponds to a thickness 54a of the insulation unit 12a, between the installation plate 14a and the food receiving element 16a.

In the present case, the insulation unit 12a has a window 34a centered in the insulation unit 12a. The window 34a of the insulation unit 12a is in the present case designed as an opening 90a. Alternatively, it would be conceivable that the window 34a of the insulation unit 12a is designed as a radiation transmission element (not shown) or that the insulation unit 12a is designed free of the window 34a of the insulation unit 12a.

The food receiving element 16a is provided for inductive heating by a heating unit 20a. The food receiving element 16a has a magnetizable and/or a magnetic material. The food receiving element 16a is provided for receiving a food (not shown) at least for carrying out a cooking process. The food receiving element 16a is part of the cooking utensil 46a. The cooking utensil 46a has the food receiving element 16a and the insulation unit 12a, wherein the insulation unit 12a is arranged below the food receiving element 16a and is connected to the food receiving element 16a. Alternatively, it would be conceivable for the insulation unit 12a to be designed as a base unit for the cooking utensil 46a that is designed separately from the cooking utensil 46a.

The cooking system 10a has the heating unit 20a. The heating unit 20a has a heating coil 66a for inductively heating the food receiving element 16a. The heating unit 20a is arranged below the heating zone 64a (see Figure 1). The cooking system 10a has a sensor unit 18a for determining a presence of the insulation unit 12a between the installation plate 14a and the food receiving element 16a. The sensor unit 18a is provided at least for recording a physical quantity for determining a presence of the insulation unit 12a and the food receiving element 16a.

The installation plate 14a has a window 36a. The window 36a of the installation plate 14a is arranged in the heating zone 64a and can show an operator at least one installation position for the cooking utensil 46a on the installation plate 14a for heating (see Figure 1). The window 36a of the installation plate 14a forms a center point of the heating zone 64a in the present case. The cooking utensil 46a is positioned on the window 36a of the installation plate 14a in the installation state. The window 34a of the installation plate 14a has a radiation transmission element 94a, in this case made of quartz. For example, a lighting unit (not shown) of the cooking system 10a can be arranged below the window 36a of the installation plate 14a. In the present case, an additional sensor unit 58a of the cooking system 10a is arranged below the window 36a of the installation plate 14a, which is intended for measuring the temperature of the cooking utensil 46a using IR radiation (not shown). The additional sensor unit 58a is intended for emitting the IR radiation and for detecting the IR radiation reflected on the food receiving element 16a. The window 36a of the installation plate 14a and the window 34a of the insulation unit 12a are intended for low-loss transmission of at least the IR radiation. The additional sensor unit 58a is arranged under a recess 52a of the heating unit 20a on an electronic circuit board 48a.

The cooking system 10a has a hob device 50a, which partially has the sensor unit 18a. The hob device 50a is arranged below the installation plate 14a. The hob device 50a is assigned to the heating zone 64a. The hob device 50a is designed as an induction hob device. The hob device 50a has the heating unit 20a and, in this case, also at least the additional sensor unit 58a.

The sensor unit 18a has at least one permanent magnet 28a and is intended to determine the presence of the insulation unit 12a depending on a magnetic field of the permanent magnet 28a. The sensor unit 18a is intended to determine detection of the presence of the insulation unit 12a depending on a magnetic flux density of the permanent magnet 28a.

The cooking system 10a has a control unit 22a. The control unit 22a is integrated in the user interface 68a (see Figure 1). The control unit 22a is connected at least in terms of data to the sensor unit 18a (see Figure 1). The control unit 22a is provided to block or enable operation of the heating unit 20a based on a signal from the sensor unit 18a. The control unit 22a is provided to enable operation of the heating unit 20a for the determined presence of the insulation unit 12a between the food receiving element 16a and the installation plate 14a. The control unit 22a is provided to block operation of the heating unit 20a for a determined absence of the insulation unit 12a between the food receiving element 16a and the installation plate 14a.

The permanent magnet 28a is integrated in the insulation unit 12a. The insulation unit 12a has the permanent magnet 28a and a holding unit 26a. The insulation unit 12a is shown in simplified form in Figure 2 for better clarity. The permanent magnet 28a is at least partially accommodated in the holding unit 26a.

A north-south direction 32a of the permanent magnet 28a is at least substantially perpendicular to a top side 30a and a bottom side 40a of the insulation unit 12a. The north-south direction 32a runs from a north pole (not shown) of the permanent magnet 28a to a south pole (not shown) of the permanent magnet 28a. The north-south direction 32a of the permanent magnet 28a is uniform. Alternatively, a north-south direction 32a is conceivable which runs opposite to the present embodiment.

The sensor unit 18a has at least one further permanent magnet 38a, which is integrated in the insulation unit 18a, wherein the further permanent magnet 38a has a north-south direction 42a parallel to the north-south direction 32a of the permanent magnet 28a. The further permanent magnet 38a is designed in accordance with the permanent magnet 28a.

The sensor unit 18a has at least one magnetic field sensor 70a. The magnetic field sensor 70a is in this case a Hall sensor 72a. The magnetic field sensor 70a is designed to averaging the magnetic field strength at the position of the magnetic field sensor 70a. The magnetic field sensor 70a is intended to determine the magnetic flux density at the position of the magnetic field sensor 70a. For example, the Hall sensor 72a can determine a magnetic flux density of up to 10 mT with a precision of 0.01 mT. The magnetic field sensor 70a is in this case a 3D Hall sensor, which provides a direction-dependent three-dimensional determination of the magnetic flux density. Alternatively, a merely one-dimensional determination of the magnetic flux density would be conceivable.

The sensor unit 18a is arranged partially under the mounting plate 14a. The magnetic field sensor 70a is arranged under the mounting plate 14a. The sensor unit 18a has a computing unit 60a and a memory unit 62a (see Figure 1). Alternatively, it would be conceivable for the control unit 22a to at least partially have the computing unit 60a and/or the memory unit 62a. The magnetic field sensor 70a is arranged on the electronic circuit board. The magnetic field sensor 70a is arranged in the recess 52a in the middle of the heating unit 20a.

The sensor unit 18a is provided to compare the magnetic field strength determined by the magnetic field sensor 70a with a reference magnetic field strength. The sensor unit 18a is provided to compare the magnetic flux density determined by the magnetic field sensor 70a with a reference magnetic field strength. In the present case, the sensor unit 18a is provided to compare a vector value of the determined three-dimensional magnetic field strength. The reference magnetic field strength can be 0.5 mT, for example. Alternatively, a larger and/or smaller value would be conceivable. The reference magnetic field strength is stored in the storage unit 62a. The computing unit 60a is provided to compare the magnetic field strength with the reference magnetic field strength. The control unit 22a is provided to block the operation of the heating unit 20a for the magnetic field strength smaller than the reference magnetic field strength. The control unit 22a is provided to enable the operation of the heating unit 20a for the magnetic field strength greater than or equal to the reference magnetic field strength.

Figure 3 shows the insulation unit 12a at least partially in a schematic plan view. The sensor unit 18a has a plurality of permanent magnets 56a, which are integrated in the insulation unit 12a and which are arranged evenly along a circumference 74a of the insulation unit 12a. The insulation unit 12a has the plurality of permanent magnets 56a. The permanent magnets 58a are each the same the permanent magnet 28a. The holding unit 26a is formed in a circular ring shape at least in sections. The permanent magnets 56a are accommodated and fixed in the holding unit 26a at equal intervals.

The insulation unit 12a is designed to be circular in shape at least in sections. The circumference 74a runs at least for the most part along an outer shape of the insulation unit 12a. The permanent magnets 56a have the same arrangement radius 44a in the insulation unit 12a.

Figure 4 shows an exemplary embodiment of the permanent magnet 28a. Dimensionless size information in Figure 4 is given in millimeters. The size information has an uncertainty of at least 0.1 mm. The permanent magnet 28a has the shape of a circular ring section. The permanent magnet 28a can have the present shape and the present dimensions for different designs of the insulation unit 12a, for example also with a changed arrangement radius 44a and/or a changed number of permanent magnets 56a in the insulation unit 12a. Alternatively, other dimensions of the permanent magnet 28a are conceivable.

The permanent magnet 28a has a magnetic material with a stable magnetization for temperatures of 250°C to 300°C that can be reached at least briefly on the insulation unit 12a. The permanent magnet 28a has samarium cobalt. Additionally or alternatively, the permanent magnet 28a can have neodymium.

Figure 5 shows a flow chart of a method for operating the cooking system 10a, wherein the presence of the insulation unit 12a is determined semi-automatically and depending on the magnetic field of the permanent magnet 28a of the sensor unit 18a.

The method has a detection step 100a. In the detection step 100a, a magnetic field is determined at the magnetic field sensor 70a. The magnetic field strength of the magnetic field is compared with a reference magnetic field strength in a calibration step 102a of the method. In a control step 104a of the method, the heating unit 20a is controlled depending on the result of the comparison in the calibration step 102a. Figures 6 and 7 each show a further exemplary embodiment of the invention. The following descriptions are essentially limited to the differences between the exemplary embodiments, whereby reference can be made to the description of the exemplary embodiment in Figures 1 to 5 with regard to identical components, features and functions. To distinguish the exemplary embodiments, the letter a in the reference numerals of the exemplary embodiment in Figures 1 to 5 has been replaced by the letters b and c in the reference numerals of the exemplary embodiments in Figures 6 and in Figure 7. With regard to components with the same designation, in particular with regard to components with the same reference numerals, reference can also be made to the drawings and/or the description of the exemplary embodiment in Figures 1 to 5.

Figure 6 shows a schematic top view of ferrite elements 84b, with only one ferrite element 84b being designated, of a heating unit (not shown). In the present embodiment of the invention, a sensor unit (not shown) has three magnetic field sensors 70b, 76b and 78b. The magnetic field sensor 70b is designed as a Hall sensor 72b. In the present case, all magnetic field sensors 70b, 76b and 78b are designed as Hall sensors. The magnetic field sensors 70b, 76b and 78b are arranged linearly to one another. The magnetic field sensors 70b, 76b and 78b are arranged along a line 98b that intersects the center 96b of the heating unit. An axis 86b and an axis 88b designate a spatial arrangement in millimeters. The magnetic field sensors 70b, 76b and 78b are spaced at a distance of 20 mm, 50 mm and 95 mm from the center 96b of the heating unit, respectively.

In the present case, the magnetic field strength corresponds to a maximum magnetic field strength determined between the magnetic field sensors 70b, 76b and 78b for comparison with a reference magnetic field strength.

Figure 7 shows an alternative arrangement of three magnetic field sensors 70c, 76c and 78c. The magnetic field sensors 70c, 76c and 78c are arranged along a triangle 80c. The magnetic field sensors 70c, 76c and 78c are spaced at an at least substantially equal distance from a center 96c of the heating unit (not shown). The magnetic field sensors 70c, 76c and 78c are spaced at an at least substantially equal distance of 60 mm from the center 96c. It would be conceivable that the triangle 80c is equilateral, with each however, an overlap between ferrite elements 84c and the magnetic field sensors 70c, 76c and 78c should advantageously be avoided. In the present case, the magnetic field sensors 70c, 76c and 78c are arranged offset between the ferrite elements 84c. To avoid an overlap between the ferrite elements 84c and the magnetic field sensors 70c, 76c and 78c, the magnetic field sensors 76c and 78c have an angular arrangement (not shown) of 90° and 235° respectively with respect to the magnetic field sensor 76c and the center 96c.

In each of the figures, only one of the objects present in multiple copies is provided with a reference symbol.

reference sign

10 cooking system

12 isolation units

14 mounting plate

16 food intake element

18 sensor unit

20 heating units

22 control unit

24 distance

26 mounting unit

28 permanent magnet

30 top

32 north-south direction

34 windows

36 windows

38 Additional permanent magnet

40 bottom

42 north-south direction

44 arrangement radius

46 cooking utensils

48 electronic board

50 hob device

52 recess

54 thickness

56 permanent magnets

58 Additional sensor unit

60 computing units

62 storage units

64 heating zones heating coil

user interface

magnetic field sensor

Hall sensor

Scope

magnetic field sensor

magnetic field sensor

triangle

ferrite element

axis

axis

opening

kitchen countertop

radiation transmission element

center

line

capture step

adjustment step

control step

Claims

claims 1. Cooking system (10a), in particular an induction cooking system, with an insulation unit (12a) for thermally insulating a mounting plate (14a) from a food receiving element (16a) and with a sensor unit (18a) for determining a presence of the insulation unit (12a) on the mounting plate (14a) and in particular between the mounting plate (14a) and the food receiving element (16a), characterized in that the sensor unit (18a) has at least one permanent magnet (28a) and is provided for determining the presence of the insulation unit (12a) depending on a magnetic field of the permanent magnet (28a). 2. Cooking system (10a) according to claim 1, characterized by a heating unit (20a) and a control unit (22a) which blocks or enables operation of the heating unit (20a) based on a signal from the sensor unit (18a). 3. Cooking system (10a) according to one of the preceding claims, characterized in that the permanent magnet (28a) is integrated in the insulation unit (12a). 4. Cooking system (10a) according to claim 3, characterized in that a north-south direction (32a) of the permanent magnet (28a) is at least substantially perpendicular to a top side (30a) and/or bottom side (40a) of the insulation unit (12a). 5. Cooking system (10a) according to claim 3 or 4, characterized in that the sensor unit (18a) has at least one further permanent magnet (38a) which is integrated in the insulation unit (12a), wherein the further permanent magnet (38a) has a north-south direction (42a) parallel to the north-south direction (32a) of the permanent magnet (28a). 6. Cooking system (10a) according to one of the preceding claims, characterized in that the sensor unit (18a) has a plurality of permanent magnets (56a) which are integrated in the insulation unit (12a) and which are arranged evenly along a circumference (74a) of the insulation unit (12a). 7. Cooking system (10a) according to one of the preceding claims, characterized in that the sensor unit (18a) has at least one magnetic field sensor (70a; 70b; 70c), in particular a Hall sensor (72a; 72b; 72c). 8. Cooking system (10a) according to claim 7, characterized by the mounting plate (14a), under which the magnetic field sensor (70a; 70b; 70c) is arranged. 9. Cooking system (10a) according to one of claims 7 or 8, characterized in that the sensor unit (18a) is provided to compare a magnetic field strength determined by the magnetic field sensor (70a; 70b; 70c) with a reference magnetic field strength. 10. Cooking system (10a) according to one of the preceding claims, characterized in that the permanent magnet (28a) comprises samarium-cobalt and/or neodymium. 11. Cooking surface device (50a) of a cooking system (10a) according to one of the preceding claims, which at least partially comprises the sensor unit (18a). 12. Cooking utensil (46a) of a cooking system (10a) according to one of claims 1 to 10, characterized by the food receiving element (16a) and the insulation unit (12a) which is arranged below the food receiving element (16a) and connected to it. 13. Method for operating a cooking system (10a), in particular according to one of claims 1 to 10, with an insulation unit (12a) for thermally insulating a mounting plate (14a) from a food receiving element (16a), wherein a presence of the insulation unit (12a) on the mounting plate (14a) and in particular between the mounting plate (14a) and the food receiving element (16a) is determined at least partially automatically, characterized in that the presence of the insulation unit (12a) is determined as a function of a magnetic field of a permanent magnet (28a) of the sensor unit (18a).