EP4183226A1 - Dispositif de table de cuisson - Google Patents

Dispositif de table de cuisson

Info

Publication number
EP4183226A1
EP4183226A1 EP21743077.6A EP21743077A EP4183226A1 EP 4183226 A1 EP4183226 A1 EP 4183226A1 EP 21743077 A EP21743077 A EP 21743077A EP 4183226 A1 EP4183226 A1 EP 4183226A1
Authority
EP
European Patent Office
Prior art keywords
unit
signal
sensor
hob device
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21743077.6A
Other languages
German (de)
English (en)
Inventor
Alejandro DEL CUETO BELCHI
Laura Elena Valero
Jorge Felices Betran
Manuel Fernandez Martinez
Jose Miguel Gil Narvion
Pablo Jesus Hernandez Blasco
Eduardo Imaz Martinez
Paul Muresan
Jose Manuel Palacios Gasos
Alberto Perez Bosque
Diego Puyal Puente
Javier SERRANO TRULLEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP4183226A1 publication Critical patent/EP4183226A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the invention relates to a hob device according to the preamble of claim 1 and a method for operating a hob device according to the preamble of claim 12.
  • Induction cooktops with sensors for detecting cookware are already known from the prior art.
  • a circuit made up of heating coils and inverters that is present anyway is used as a sensor for detecting cookware on the induction field by using a change in an electrical parameter of the circuit, for example a changed inductance, to indicate the presence of cookware above the heating unit will be closed.
  • an additional separate sensor circuit which is also known as a so-called Colpitts oscillator, is used to detect cookware.
  • the degree of coverage of one or more heating coils by the cooking utensil can also be detected by measuring an oscillation frequency of the sensor circuit, which varies depending on the material of the cooking utensil and/or the cover degree of the cooking utensil changed. Due to the electromagnetic fields generated by the heating coils during operation, there can be unwanted interactions with the sensor circuit and thus errors in detection. In the known devices with a separate sensor circuit, therefore, a somewhat reliable detection is only possible during the period of zero crossing of the mains AC voltage, due to the reduced electromagnetic interactions between the heating coil and the sensor circuit during this period. Thus, no continuous detection can take place.
  • phase offset also leads to increased electromagnetic interactions with neighboring heating coils that are operated out of phase, due to the phase offset even during a phase-zero crossing, and thus to a particularly great susceptibility to error when detecting cookware.
  • the object of the invention is in particular, but not limited to, to provide a generic device with improved properties in terms of ease of use. The object is achieved according to the invention by the features of patent claims 1 and 12, while advantageous refinements and further developments of the invention can be found in the dependent claims.
  • the invention is based on a hob device, in particular an induction hob device, with at least one heating unit, with at least one sensor unit which is separate from the heating unit and has at least one electrical resonant circuit and is provided for detecting at least one sensor signal, and with a control unit , which is provided to control the sensor unit and to evaluate the sensor signal.
  • control unit determines at least one state variable relating to the heating unit using a phase shift and/or an amplitude ratio between the sensor signal and a further signal.
  • Such a configuration can advantageously improve operating convenience and/or an operating experience for a user.
  • a particularly reliable, in particular less susceptible to faults, and/or precise detection of the sensor signal and consequently a particularly reliable and precise determination of the state variable relating to the heating unit for example the presence of cooking utensils on a hob plate above the heating unit and/or a degree of coverage of a heating element of the heating unit with the cooking utensil can be achieved. Since the state variable relating to the heating unit is determined by the control unit using a phase shift and/or an amplitude ratio between the sensor signal and the further signal, the accuracy of the determined state variable can advantageously be further improved.
  • the sensor unit Since the sensor unit is designed separately from the heating unit, false detections due to electromagnetic interactions with the heating unit can advantageously be reduced and preferably minimized by using a signal amplification unit. Furthermore, the sensor unit can advantageously be operated independently of the heating unit and thus the state variable relating to the heating unit can be determined continuously, as a result of which operating comfort and/or an operating experience for a user can advantageously be further improved. For example, during operation of the hob device, a particularly fast and reliable detection of a cooking utensil moving onto a hob plate and an automatic adjustment of the heating elements of the heating unit to be operated would be conceivable.
  • the separate design of the sensor unit and heating unit advantageously enables the use of particularly high-resolution sensor units, which means that, in addition to the presence and the degree of coverage, other state variables relating to the heating unit, such as a shape and/or a size and/or a material, of the cooking utensil can be determined.
  • a “cooktop device”, in particular an “induction cooktop device”, should be understood to mean at least a part, in particular a subassembly, of a cooktop, in particular an induction cooktop.
  • the hob device could, for example, have at least one support plate, in particular at least one hob plate, which could be provided, for example, for setting up cookware, in particular for the purpose of heating the cookware.
  • the hob device, in particular the induction hob device can also include the entire hob, in particular the entire induction hob.
  • the hob device is preferably designed as an induction hob device. Alternatively, however, it would also be conceivable for the hob device to be part of another type of hob, for example a glass ceramic hob or the like.
  • a “heating unit” is to be understood as meaning a unit which has at least one heating element which, in at least one operating state, provides energy to at least one object, for example a cooking utensil.
  • the heating element of the Schuein unit could be designed, for example, as a radiant heater heating element for a glass ceramic cooktop and provide energy in the form of thermal radiation to the object in the operating state.
  • the heating unit is preferably designed as an induction heating unit and has at least one heating element, which is designed as an induction heating element.
  • the heating element designed as an induction heating element is intended to provide energy to the object in the operating state in the form of an alternating electromagnetic field, advantageously for the purpose of inductive energy transmission.
  • the heating unit advantageously has at least two, particularly advantageously at least four, preferably at least eight and particularly preferably a large number of heating elements on.
  • the heating elements of the heating unit can be distributed, for example distributed in a matrix manner.
  • a “sensor unit” is a unit with at least one sensor assembly, which has at least the electrical oscillating circuit, at least one signal input electrically conductively connected to the electrical oscillating circuit and at least one signal output electrically conductively connected to the electrical oscillating circuit and which is used to detect the at least one Sensor signal is provided to be understood.
  • the electrical oscillating circuit preferably comprises at least one electrical resistor, at least one induction coil and at least one capacitor.
  • the signal input is preferably designed as an electrical component, in particular as a connection point, for feeding a signal into the electrical oscillating circuit, in particular for activation by means of the control unit.
  • the signal output is preferably designed as an electrical component, for example as an electrical shunt resistor, at which at least one output signal occurs.
  • the sensor unit is provided for the detection of at least one sensor signal” is to be understood that the sensor signal can be measured on at least one electrical component of the sensor unit, in particular on the signal input and/or the signal output, with a measurement of the sensor signal can also take place, at least in part, by means of other units of the hob device that are different from the sensor unit, in particular by means of the control unit.
  • the sensor signal is preferably an electrical signal which, in the form of an electrical voltage and/or an electrical current, in particular in the form of an electrical alternating voltage and/or an alternating electrical current, is applied to the signal input and/or to the Signal output of the sensor assembly is present and/or drops and/or flows and which describes at least one electrical variable of the electrical resonant circuit, in particular an equivalent impedance of the electrical resonant circuit.
  • the further signal is preferably an electrical signal, which is in the form of an electrical voltage and/or an electrical current, in particular in the form of an electrical alternating voltage and/or an electrical alternating current, at the signal input and/or at the signal output the sensor assembly is applied and / or falls and / or flows and which describes at least one electrical variable of the electrical oscillating circuit, in particular an equivalent impedance of the electrical oscillating circuit.
  • the sensor unit can have sensor assemblies, which are each provided for detecting at least one sensor signal.
  • the sensor unit advantageously has a number of sensor assemblies which correspond to at least a number of heating elements of the heating unit.
  • the sensor unit preferably has a greater number of sensor assemblies than the number of heating elements in the heating unit.
  • control unit should be understood to mean an electronic unit which is at least partially integrated in the hob device and which is intended to control at least the sensor unit and to evaluate the sensor signal.
  • the control unit can be electrically conductively connected to the signal input and/or the signal output of the sensor unit.
  • the control unit is preferably also provided for controlling and supplying energy to the heating unit and/or other units of the hob device.
  • the control unit preferably has at least one inverter unit for the control and energy supply of the heating unit, which can be designed in particular as a resonance inverter and/or as a dual half-bridge inverter.
  • the inverter unit preferably comprises at least two switching elements which can be controlled individually by the control unit.
  • a “switching element” should be understood to mean an element which is intended to establish and/or break an electrically conductive connection between two points, in particular contacts of the switching element.
  • the switching element preferably has at least one control contact via which it can be switched.
  • the switching element is preferably in the form of a semiconductor switching element, in particular a transistor, for example a metal-oxide-semiconductor field effect transistor (MOSFET) or organic field effect transistor (OFET), advantageously a bipolar transistor with a preferably insulated gate electrode (IGBT).
  • MOSFET metal-oxide-semiconductor field effect transistor
  • OFET organic field effect transistor
  • IGBT preferably insulated gate electrode
  • the switching element is designed as a mechanical and/or electromechanical switching element, in particular as a relay.
  • the control unit preferably comprises at least one computing unit for evaluating the sensor signal and for determining the at least one state variable relating to the heating unit.
  • the control unit preferably includes at least one memory unit in which at least one reference signal and preferably at least one algorithm for determining the state variable relating to the heating unit is stored.
  • the state variable relating to the heating unit could, without being limited to it, be, for example, the presence and/or the degree of coverage of one or more heating elements of the heating unit and/or a shape and/or a size and/or an electrical and /or an electromagnetic parameter, for example an electrical resistance and/or an inductance, of an object, in particular a cooking utensil, to which the heating unit provides the energy in the operating state.
  • Provided is to be understood to mean specially programmed, designed and/or equipped.
  • the fact that an object is provided for a specific function should be understood to mean that the object fulfills and/or executes this specific function in at least one application and/or operating state.
  • the hob device comprises a plate unit which is arranged above the heating unit and at least partially has the sensor unit.
  • the plate unit advantageously allows a particularly powerful, in particular high-resolution, sensor unit to be integrated in the hob device, as a result of which ease of use and/or an operating experience for a user of the hob device can be further improved.
  • the plate unit preferably has at least the electrical oscillating circuit of the sensor unit.
  • the plate unit could, for example, have at least one printed circuit board, to which electrical components of the sensor unit, in particular electrical components of the electrical oscillating circuit of the sensor unit, are attached and electrically conductively connected to one another.
  • the printed circuit board could, for example, be a surface-mounted component (Surface Mounted Device, SMD for short) in a single-layer or multi-layer design, which is produced using a method suitable for this.
  • the printed circuit board could be designed as a fixed printed circuit board.
  • the printed circuit board could be designed as a flexible printed circuit board, for example as a rigid-flex printed circuit board or as a semi-flexible printed circuit board.
  • the hob device includes a mounting unit which fixes at least one heating element of the heating unit and at least part of the sensor unit together.
  • the mounting unit fixes the at least one heating element of the heating unit and the at least one part of the sensor unit together, in particular relative to a further unit, in for example the control unit.
  • a particularly compact and/or cost-effective construction of the hob device can advantageously be achieved by such a configuration.
  • the mounting unit could be designed, for example, as a coil carrier for receiving and positioning an induction coil of a heating element of the heating unit designed as an induction heating element, which is also intended to hold and close at least part of the sensor unit, for example the induction coil of the electrical oscillating circuit position.
  • at least part of the sensor unit to be integrated in an insulating layer of the mounting unit, to which the at least one heating element of the heating unit is fixed.
  • control unit has at least one signal generation unit, which is provided for generating a signal for controlling the sensor unit.
  • the signal is preferably an input signal which can be applied to the at least one signal input of the sensor unit.
  • the signal generation unit is designed as a unit different from the inverter unit.
  • the signal generated by the signal generation unit differs from an inverter signal, which is generated by an inverter of the inverter unit for driving and supplying energy to a heating element of the heating unit, at least with regard to a frequency.
  • the signal generated by the signal generation unit is preferably a high-frequency signal with an increased frequency compared to an inverter frequency of the inverter signal for controlling and supplying energy to a heating element of the heating unit.
  • the frequency of the signal is higher by a factor of at least 2, advantageously by a factor of at least 3, particularly advantageously by a factor of at least 4, preferably by a factor of at least 5 and particularly preferably by a factor of at least 10 than the inverter frequency.
  • the frequency of the signal is at least 1 MHz, advantageously at least 2 MHz, particularly advantageously at least 5 MHz, preferably at least 10 MHz and particularly preferably at least 20 MHz.
  • the signal generation unit is preferably provided for digital signal generation see.
  • the signal generation unit could have, for example, a synthesizer with direct digital synthesis (DDS) and a digital-to-analog converter (DAC), which are designed in particular as an integrated circuit (IC).
  • DDS direct digital synthesis
  • DAC digital-to-analog converter
  • the signal generation unit could have, for example, a so-called R2R resistance network and/or an analog multiplexer or a digital multiplexer.
  • the signal could be generated as a square-wave signal by means of a microprocessor of the control unit and then filtered by means of a filter, for example by means of a serial RLC circuit, and converted into a sinusoidal signal.
  • control unit has a signal amplification unit for amplifying the signal and for increasing a signal-to-noise ratio in relation to interference signals.
  • the detection of the sensor signal can advantageously be further improved and the occurrence of erroneous detections can be further minimized.
  • the signal amplification unit could have, for example, a differential amplifier and/or an operational amplifier and/or an impedance converter for amplifying the signal.
  • the signal has a frequency which corresponds at least essentially to a resonant frequency of the resonant circuit.
  • a particularly meaningful sensor signal can advantageously be detected and consequently a particularly precise determination of the state variable relating to the heating unit can be achieved.
  • the resonant frequency is a variable related to a reference state of the oscillating circuit of the sensor unit.
  • the frequency of the signal which corresponds at least essentially to the resonant frequency of the resonant circuit, deviates from the resonant frequency by no more than 10%, advantageously no more than 5%, preferably no more than 2% and particularly preferably no more than 1%.
  • the signal it would be conceivable for the signal to have a frequency that is greater or less than the resonant frequency of the electrical oscillating circuit.
  • a reference signal which includes a difference between at least one variable of the sensor signal and at least one variable of the further signal, measured in a reference state, is stored in the control unit.
  • a “reference signal” should be understood to mean a signal which can be detected on the sensor unit in a reference state.
  • the reference state is a state in which the hob device, in particular the sensor unit of the hob device, is operated in the absence of external influences, in particular in the absence of an external object, such as cooking utensil, which would influence the signal.
  • the size of the signal and/or the further signal can be, for example, a phase of a voltage and/or a current and/or an amplitude of a voltage and/or a current.
  • the difference between the size of the sensor signal and the size of the further signal can be a difference between two similar sizes, for example a difference between an amplitude of a voltage of the sensor signal and an amplitude of a voltage of the further signal, or a difference between two different sizes , for example a difference between a phase angle of a voltage of the sensor signal and a phase angle of a current of the further signal.
  • control unit has at least one detection unit for detecting the phase shift and/or an amplitude.
  • detection unit can be designed as an analog phase comparator, for example as an analog multiplier or as a fully symmetrical mixer or as a diode mixer and can be provided for analog detection of the phase shift and/or the amplitude.
  • the detection unit could be designed as a digital phase comparator and/or as a digital amplitude comparator, with a digital detection of the phase shift and/or the amplitude, starting from a previously converted rectangular signal, for example by means of an XOR gate or a flip-flop -Circuit or the like could take place.
  • the detection unit be designed as a lock-in amplifier.
  • a signal-to-noise ratio can advantageously be increased and thus a susceptibility to errors in the detection can be further reduced.
  • the detection unit designed as a lock-in amplifier is preferably also provided for detecting an amplitude of the sensor signal and an amplitude of the further signal, in particular the reference signal. Based on the phase shift detected by the detection unit designed as a lock-in amplifier and the detected amplitude of the sensor signal and an amplitude of the further signal, in particular the reference signal, an impedance and thus an equivalent resistance and an equivalent inductance of a garge harness used is preferably determined by the control unit, calculable. As a result, operation can advantageously be further improved by, for example, enabling the heating unit to be controlled by the control unit in a way that is specially matched to a specific cooking utensil.
  • control unit to determine the state variable in the operating state, compares a phase angle of the sensor signal with a phase angle of the further signal, in particular the reference signal, and/or an amplitude of the sensor signal with an amplitude of the further signal, in particular the reference signal, compares
  • phase angle and/or the amplitude of the sensor signal is preferably compared with the phase angle and/or the amplitude of the further signal, in particular the reference signal, by means of the detection unit of the control unit.
  • control unit for determining the state variable in the operating state, varies the frequency of the signal until a phase angle of the sensor signal and a phase angle of the reference signal match.
  • the control unit preferably varies the frequency of the signal using the signal generation unit until the phase angle of the sensor signal matches the phase angle of the reference signal, stores the frequency required for the phase angle to match, and compares it, in particular using a algorithm stored in the memory unit, with the resonant frequency in the reference state and determines therefrom the state variable relating to the heating unit.
  • the invention also relates to a hob with a hob device according to one of the aforementioned configurations.
  • a hob is characterized, inter alia, by the above-mentioned advantageous properties of the hob device and the associated advantages for a user in terms of improved operating convenience and/or an improved operating experience.
  • the invention is also based on a method for operating a hob device with at least one heating unit and at least one sensor unit which is formed separately from the heating unit and has at least one electrical resonant circuit.
  • At least one sensor signal is detected and at least one state variable relating to the heating unit is determined using a phase shift and/or an amplitude ratio between the sensor signal and another signal, in particular a stored reference signal.
  • a particularly reliable method can advantageously be used, particularly in comparison to conventional methods in which a state variable is determined based on a detected frequency is determined, less susceptible to interference, and accurate determination of the state variable can be made possible.
  • the hob device should not be limited to the application and embodiment described above.
  • the hob device can have a number of individual elements, components and units that differs from the number of individual elements, components and units specified here in order to fulfill a function described herein.
  • Show it: 1 shows a hob with a hob device, comprising a heating unit, a sensor unit and a control unit, in a schematic plan view,
  • FIG. 2 shows a schematic exploded view of the hob device with a plate unit arranged above the heating unit
  • FIG. 3 shows a schematic electrical circuit diagram of an electrical oscillating circuit of the sensor unit
  • FIG. 4 shows two schematic diagrams for the representation of a sensor signal detected by the sensor unit and a reference signal
  • Fig. 5 is a schematic diagram showing the control unit
  • FIG. 6 shows a schematic process flow diagram of a process for operating the hob device
  • FIG. 7 shows a schematic representation of a mounting unit of a hob device in a further exemplary embodiment
  • FIG. 8 shows a schematic diagram for representing a control unit of a hob device in a further exemplary embodiment.
  • FIG. 1 shows a hob 42a in a schematic plan view.
  • the hob 42a is designed as an induction hob.
  • the hob 42a has a hob device 10a.
  • the hob device 10a is designed as an induction hob device.
  • the hob device 10a includes a heating unit 12a.
  • the heating unit 12a has a plurality of heating elements 32a, which are each formed out as induction heating elements.
  • the hob device 10a includes a sensor unit 14a.
  • the sensor unit 14a is formed separately from the heating unit 12a.
  • the sensor unit 14a has an electrical resonant circuit 16a (cf. FIG. 3).
  • the sensor unit 14a is provided for detecting a sensor signal 18a (cf. FIG. 4).
  • the hob device 10a includes a control unit 20a.
  • the control unit 20a is provided for controlling the sensor unit 14a.
  • the control unit 20a is one Evaluation of the sensor signal 18a provided.
  • control unit 20a determines at least one state variable 22a (cf. FIG. 5) relating to heating unit 12a using a phase shift 24a and/or an amplitude ratio between sensor signal 18a and another signal.
  • a reference signal 26a is stored in the control unit 20a.
  • the reference signal 20a includes a difference, measured in a reference state, between a magnitude of the sensor signal 18a and a magnitude of the further signal.
  • the size of the sensor signal 18a is a phase angle and the size of the other signal is a further phase angle.
  • FIG 2 shows the hob device 10a in a schematic exploded view.
  • the hob device 10a has a plate unit 28a.
  • the plate unit 28a In an assembled state of the hob device 10a, the plate unit 28a is arranged above the heating unit 12a and below a hob plate 62a of the hob 42a.
  • the plate unit 28a has the sensor unit 14a at least partially.
  • the plate unit 28a has the oscillating circuit 16a of the sensor unit 14a.
  • the oscillating circuit 16a of the sensor unit 14a is mounted on a printed circuit board which is connected to the plate unit 28a.
  • FIG. 3 shows a schematic electrical circuit diagram of the sensor unit 14a.
  • the sensor unit 14a includes the electrical resonant circuit 16a.
  • the sensor unit 14a includes a signal input 44a and a signal output 46a, which are each electrically conductively connected to the electrical oscillating circuit 16a.
  • the electrical resonant circuit 46a includes an electrical resistor 48a, an induction coil 50a and a capacitor 52a.
  • the signal input 44a of the sensor unit 14a is electrically conductively connected to a signal amplification unit 38a and to a signal generation unit 34a of the control unit 20a.
  • a signal generated by the signal generation unit 34a and amplified by the signal amplification unit 38a is fed into the electrical oscillating circuit 16a via the signal input 44a.
  • the signal output 46a is designed as a shunt resistor 64a.
  • Two diagrams are shown in FIG. A frequency in megahertz is plotted on an abscissa 54a of a left diagram. An amount of an impedance in ohms is plotted on an ordinate 56a of the left-hand diagram.
  • the reference signal 26a is shown with a solid line.
  • the sensor signal 18a is shown with a dashed line.
  • the magnitude of the impedance of the reference signal has a maximum at a resonant frequency 66a of the resonant circuit.
  • the frequency in megahertz is plotted on an abscissa 58a of a right-hand diagram.
  • a phase angle is plotted on an ordinate 60a of the right-hand diagram.
  • the reference signal 26a is shown with a solid line.
  • the sensor signal 18a is shown with a dashed line.
  • a phase angle of reference signal 26a which can be measured in electrical resonant circuit 16a of sensor unit 14a in a reference state at resonant frequency 66a, is 20°, for example.
  • a phase angle of sensor signal 18a which can be measured at resonant frequency 66a in electrical resonant circuit 16a of sensor unit 14a in an operating state of hob device 10a in which a cooking utensil (not shown) is placed above sensor unit 14a, is -20°, for example . This results in the phase shift 24a, which is 40° in this example.
  • the sensor signal 18a describes a relationship between a signal 36a (see FIG. 5) and an output signal 92a of the electrical oscillating circuit 16a and can be considered as an equivalent impedance of the electrical oscillating circuit 16a in the operating state.
  • the reference signal 26a can be regarded as an equivalent impedance of the electrical resonant circuit 16a in the reference state.
  • the control unit 20a has the signal generation unit 34a.
  • the signal generation unit 34a is provided for generating the signal 36a for controlling the sensor unit 14a.
  • the control unit 20a has the signal amplification unit 38a.
  • the signal amplification unit 38a is provided to amplify the signal 36a and to increase a signal-to-noise ratio with respect to interference signals.
  • interference signals could be caused, for example, by an electromagnetic field provided by a heating element 32a of the heating unit 12a for heating.
  • the signal 36a generated by the signal generation unit 34a and amplified by the signal amplification unit 38a is fed into the electrical oscillating circuit 16a of the sensor unit 14a via the signal input 44a (cf. FIG. 3).
  • the signal 36a has a frequency which essentially corresponds to the resonant frequency 66a of the electrical oscillating circuit 16a.
  • the resonant frequency 66a is stored in a storage unit 70a of the control unit 20a and is transmitted to the signal generation unit 34a in the operating state for the generation of the signal 36a.
  • the control unit 20a has a detection unit 40a.
  • the detection unit 40a is provided for detecting the phase shift 24a and/or an amplitude.
  • the detection unit 40a is designed as a lock-in amplifier. A voltage dropping in the operating state at the signal output 46a designed as a shunt resistor 64a can be detected as the output signal 92a and is transmitted to the detection unit 40a. The signal 36a is also transmitted to the detection unit 40a.
  • the control unit 20a compares a phase angle and/or an amplitude of the sensor signal 18a and a phase angle and/or an amplitude of the reference signal 26a.
  • the phase angles are compared by means of the detection unit 40a.
  • the detection unit 40a detects the phase shift 24a and transmits this to an arithmetic unit 68a of the control unit 20a.
  • the reference signal 26a is stored in the memory unit 70a.
  • the computing unit 68a accesses the memory unit 70a and determines the state variable using the phase shift 24a between the sensor signal 18a and the further signal.
  • the state variable 24a contains information about the degree of coverage of a heating element 32a of the heating unit 12a (cf. FIG. 1) with a cooking utensil (not shown).
  • FIG. 6 shows a schematic process flow diagram of a process for operating the hob device 10a.
  • the at least one sensor signal 18a is detected and at least the state variable 22a relating to the heating unit 12a based on the phase shift 24a and/or the amplitude ratio between the sensor signal 18a and the further signal, which is used as the reference signal 26a is stored in the control unit.
  • the procedure comprises several procedural steps.
  • a square-wave signal is generated by a microprocessor in the signal generation unit 34a.
  • the square-wave signal is converted into the signal 36a by means of the signal generation unit 34a.
  • the signal 36a is now sinusoidal and is transmitted to the signal amplification unit 38a.
  • the signal 36a is amplified and then fed into the electrical oscillating circuit 16a of the sensor unit 14a via the signal input 44a (cf. FIG. 3) and transmitted to the detection unit 40a.
  • the output signal 92a is detected at the signal output 46a of the electrical oscillating circuit and is transmitted to the detection unit 40a.
  • the detection unit 40a detects the phase shift 24a between the sensor signal 18a and the stored further signal and transmits this to the computing unit 68a of the control unit 20a.
  • the computing unit 68a determines the state variable 22a using the phase shift 24a.
  • FIGS. 1 to 6 Two further exemplary embodiments of the invention are shown in FIGS.
  • the following descriptions are essentially limited to the differences between the exemplary embodiments, with reference being made to the description of the exemplary embodiment in FIGS. 1 to 6 with regard to components, features and functions that remain the same.
  • the letter a in the reference numbers of the exemplary embodiment in FIGS. 1 to 6 is replaced by the letters b and c in the reference numbers of the exemplary embodiments in FIGS.
  • identically designated components in particular with regard to components with the same reference numbers, reference can in principle also be made to the drawings and/or the description of the exemplary embodiment in FIGS.
  • FIG. 7 shows a schematic representation of a mounting unit 30b of a hob device 10b.
  • the hob device 10b has a sensor unit 14b and a heating unit 12b.
  • the mounting unit 30b fixes a heating element 32b of the heating unit 12b and at least a part of the sensor unit 14b together.
  • the hob device 10b differs from the hob device 10a of the previous exemplary embodiment essentially with regard to an arrangement of the sensor unit 14b. There- With regard to the mode of operation of the hob device 10b, reference is made at this point to the above description of the exemplary embodiment in FIGS.
  • the holding unit 30b comprises a first holding element 76b and a second holding element 78b.
  • An induction coil 50b of sensor unit 14b is fixed to first mounting element 76b of mounting unit 30b.
  • the heating element 32b of the heating unit 12b is fixed to the second holding element 78b of the holding unit 30b.
  • the first mounting element 76b and the second mounting element 78b are connected to one another in an assembled state and form the mounting unit 30b.
  • FIG. 8 shows a further exemplary embodiment of a hob device 10c.
  • the hob device 10c differs from the hob device 10a of the exemplary embodiment in FIGS. 1 to 6 essentially with regard to the configuration of a control unit 20c.
  • FIGS. 1 to 6 With regard to further components of the hob device 10c, reference is made at this point to the above description of FIGS.
  • FIG. 1 A schematic diagram of the control unit 20c is shown in FIG.
  • the control unit 20c determines at least one state variable 22c based on a phase shift 24c between a sensor signal 18c and a stored reference signal 26c.
  • the control unit 20c varies a frequency 94c of a signal 36c to determine the state variable 22c until a phase angle of the sensor signal 18c and a phase angle of the reference signal 26c match.
  • the control unit 20c has a signal generation unit 34c, which is provided for generating the signal 26c for controlling a sensor unit 14c.
  • signal generation unit 34c initially generates signal 36c using a resonant frequency 66c stored in a memory unit 70c of control unit 20c and transmits signal 36c to sensor unit 14c and to a detection unit 40c of control unit 20c.
  • the detection unit 40c determines the phase shift 24c from the signal 36c and an output signal 92c of the sensor unit 14c. As long as the phase shift 24c has a non-zero amount, the control unit 20c varies the frequency 94c by transmitting either a frequency reduction 72c or a frequency increase 74c to the signal generation unit 34c.
  • control unit 20c If the phase angle of the sensor signal 18c and the phase angle of the reference signal 26c match, ie the phase shift 24c is zero, the control unit 20c stores the associated frequency 94c in the memory unit 70c.
  • a computing unit 68c of control unit 20c accesses memory unit 20c, compares frequency 94c with resonant frequency 66c and uses this to determine state variable 22.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Cookers (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

L'invention concerne un dispositif de table de cuisson (10a, 10b, 10c), en particulier un dispositif de table de cuisson à induction, comprenant : au moins une unité de chauffage (12a, 12b) ; au moins une unité capteur (14a, 14b, 14c) qui est séparée de l'unité de chauffage (12a, 12b), présente au moins un circuit résonnant électrique (16a) et qui est prévue pour détecter au moins un signal de capteur (18a, 18c) ; et une unité de commande (20a, 20c), qui est prévue pour commander l'unité capteur (14a, 14b, 14c) et analyser le signal de capteur (18a, 18c). Afin de fournir un dispositif de table de cuisson présentant des propriétés de confort d'utilisateur améliorées, selon l'invention, l'unité de commande (20a, 20c) détermine, dans un état de fonctionnement, au moins une variable d'état (22a, 22c) se rapportant à l'unité de chauffage (12a, 12b) sur la base d'un déphasage (24a, 24c) et/ou d'un rapport d'amplitude entre le signal de capteur (18a, 18c) et un autre signal.
EP21743077.6A 2020-07-17 2021-07-06 Dispositif de table de cuisson Pending EP4183226A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20382652 2020-07-17
PCT/EP2021/068641 WO2022013008A1 (fr) 2020-07-17 2021-07-06 Dispositif de table de cuisson

Publications (1)

Publication Number Publication Date
EP4183226A1 true EP4183226A1 (fr) 2023-05-24

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Application Number Title Priority Date Filing Date
EP21743077.6A Pending EP4183226A1 (fr) 2020-07-17 2021-07-06 Dispositif de table de cuisson

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US (1) US20230225020A1 (fr)
EP (1) EP4183226A1 (fr)
WO (1) WO2022013008A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014090864A1 (fr) * 2012-12-11 2014-06-19 Arcelik Anonim Sirketi Surface de cuisson à chauffage par induction
EP2854477B1 (fr) * 2013-09-30 2020-11-11 Electrolux Appliances Aktiebolag Procédé et dispositif permettant de déterminer le caractère approprié d'une batterie de cuisine pour la bobine d'induction correspondant de la table de cuisson par induction
KR102069581B1 (ko) * 2017-06-26 2020-01-23 엘지전자 주식회사 유도 가열 장치 및 유도 가열 장치의 제어 방법
ES2754873A1 (es) * 2018-10-18 2020-04-20 Bsh Electrodomesticos Espana Sa Dispositivo de inducción

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US20230225020A1 (en) 2023-07-13

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