EP3066888B1 - Induction hob device - Google Patents

Induction hob device Download PDF

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Publication number
EP3066888B1
EP3066888B1 EP14806727.5A EP14806727A EP3066888B1 EP 3066888 B1 EP3066888 B1 EP 3066888B1 EP 14806727 A EP14806727 A EP 14806727A EP 3066888 B1 EP3066888 B1 EP 3066888B1
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EP
European Patent Office
Prior art keywords
induction
induction heating
detection circuit
heating element
unit
Prior art date
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Active
Application number
EP14806727.5A
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German (de)
French (fr)
Other versions
EP3066888A1 (en
Inventor
Nicolas Blasco Rueda
Oscar Garcia-Izquierdo Gango
Ignacio Garde Aranda
Oscar Gracia Campos
Pablo Jesus Hernandez Blasco
Daniel Palacios Tomas
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP3066888A1 publication Critical patent/EP3066888A1/en
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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
    • H05B6/06—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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
    • F24C7/088—Arrangement or mounting of control or safety devices of electric circuits regulating heat on stoves
    • 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
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
    • 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 is based on an induction hob apparatus according to the preamble of claim 1.
  • the invention is based on an induction hob apparatus with at least one induction heating element which is provided for heating cooking utensils, and with at least one detection circuit which, in cooperation with the at least one induction heating element, is provided at least for the detection of erected cooking utensils.
  • the at least one detection circuit is connected to the at least one induction heating element independently of an operating state.
  • An “induction hob device” should be understood in particular to mean a part, in particular a subassembly, of an induction hob.
  • An “induction heating element” is to be understood, in particular, as a wound electrical conductor, which in at least one operating state flows through high-frequency alternating current, in particular heating current.
  • the induction heating element is intended to convert electrical energy into a magnetic alternating field, which is intended to be in a metallic, preferably at least partially ferromagnetic, garland eddy currents and / or Ummagnetmaschines bin cause, which are converted into heat.
  • the induction heating element is intended to cause heating of the cooking utensil.
  • the induction hob device comprises at least two, in particular at least three, advantageously at least four, particularly advantageously at least eight, preferably at least ten, particularly preferably a plurality of induction heating elements.
  • a "detection circuit" is to be understood, in particular, as an electrical circuit which is provided as a function of cooking utensils installed in an installed position above the induction heating element for changing at least one detection characteristic.
  • the detection circuit flows through at least one operating state of at least one detection current.
  • the detection circuit is provided as a function of cooking utensils installed in an installed position above the induction heating element for changing at least one frequency of the detection current.
  • the detection circuit could be provided in response to a set up in an installed position above the induction heating Garware for changing at least one phase angle of the detection current.
  • the detection circuit is provided to be supplied by at least one sensor current supply unit, which is in particular formed separately from at least one power current supply unit to supply the at least one induction heating.
  • the induction hob device comprises at least two, in particular at least three, advantageously at least four, particularly advantageously at least eight, preferably at least ten, particularly preferably a plurality of detection circuits.
  • a number of induction heating elements and a number of detection circuits are at least substantially, in particular exactly the same.
  • a detection circuit with at least two, in particular with at least three, advantageously with at least four, particularly advantageously connected to a plurality of induction heating elements.
  • independent of an operating state should be understood in particular independently of at least one position of at least one switching element and / or independent of a current flow through the induction heating element.
  • the phrase that the detection circuit is "directly" connected to the induction heating element independently of an operating state is intended in particular be understood that the detection circuit and the induction heating in any operating condition, in particular at least for alternating current form a closed circuit. In particular, in each heating operating state, electric current, in particular alternating current, flows through the closed circuit.
  • the detection circuit in each operating state, is traversed by a detection current corresponding to a heating current.
  • a connection between the detection circuit and the induction heating element is free of switching elements, in particular of relays and / or transistors.
  • an induction hob device can be provided with an advantageous construction.
  • low production costs can be achieved.
  • switching elements can be dispensed with for establishing a connection between the detection circuit and the induction heating element.
  • problems due to low current through contacts of a switching element, in particular a relay can be avoided.
  • a detection can advantageously be carried out independently of a switching position of a switching element, in particular of a relay.
  • an induction hob device with at least one induction heating element which is part of at least one power circuit and at least heated cooking utensils, and with at least one detection circuit, which is provided at least for detection of cooking utensils and in at least an operating state comprising at least one induction heating element, wherein the at least one detection circuit has at least one protection unit which is connected to the at least one induction heating element and branches off from the at least one power resonant circuit.
  • the protection unit is included In particular, it is provided to protect at least the at least one detection circuit from external voltages independently of an operating state, in particular at least in a heating operating state.
  • the at least one protection unit is provided to at least substantially prevent the penetration of, in particular, high-frequency heating current into the detection circuit.
  • a value of a frequency of a detection current differs from a value of a frequency of a heating current by a factor of at least 10, in particular of at least 100, advantageously of at least 500, particularly advantageously of at least 1000.
  • "External voltages” are to be understood in particular as voltages, which advantageously decrease in an operating state via at least one heating frequency unit and / or via the at least one induction heating element.
  • the term “external stresses” should be understood to mean, in particular, voltages which are provided, in particular, for being used in an operating state for operating the at least one induction heating element.
  • the protection unit is intended to "at least substantially prevent” in particular high-frequency heating current from entering the detection circuit
  • the protection unit is intended to have a maximum proportion of 50%, in particular maximum 30%, advantageously of at most 15%, particularly advantageously of not more than 10%, preferably of not more than 5% and particularly preferably of not more than 2%, of heating current striking the protective unit on one side at a passing, in particular reaching a second one facing away from the first side Side to prevent the protection unit.
  • an induction hob device can be provided with an advantageous construction, wherein advantageously a precise detection of cooking utensils can be achieved.
  • the induction hob device comprises at least one heating frequency unit for supplying the at least one induction heating element, wherein the at least one detection circuit is branched off from a connection between the at least one heating frequency unit and the at least one induction heating element.
  • a "heating frequency unit” should in particular be understood to mean an electrical unit which has an oscillating electrical signal, preferably with a frequency of at least 1 kHz, in particular of at least 10 kHz, advantageously of at least 20 kHz and in particular of not more than 100 kHz generates at least one induction heating element.
  • the heating frequency unit is provided to provide a, required by the induction heating, maximum electrical power of at least 100 W, in particular at least 500 W, advantageously at least 1000 W and preferably at least 1500 W.
  • the Schufrequenzü advantageously comprises at least one inverter, preferably at least two, preferably in series, bidirectional unipolar switches, which are formed in particular by a transistor and a parallel diode, and particularly advantageously at least one parallel to the bidirectional unipolar switches switched buffer capacity, which is in particular formed by at least one capacitor.
  • a voltage tap of the heating frequency unit is arranged in particular at a common contact point of two bidirectional unipolar switches.
  • the at least one heating frequency unit and the at least one induction heating element form the at least one power resonant circuit, at least in one operating state.
  • a "connection" between the heating frequency unit and the induction heating element should in particular be understood as a bridging of at least one distance between the heating frequency unit and the induction heating element, which is electrically conductive in at least one operating state.
  • the connection between the heating frequency unit and the induction heating element could take place directly and / or via at least one switching element.
  • the detection circuit is "branched off” from a connection between the heating frequency unit and the induction heating element, it should be understood in particular that at least one and preferably exactly one electrically conductive contact point exists by means of which the detection circuit connects to the connection between the heating frequency unit and the heating frequency unit Induction heating element is connected. This can be achieved in particular a precise detection of erected on the induction heating cookware.
  • the induction hob apparatus comprise at least one protection unit which is provided to protect at least the at least one detection circuit, in particular during an operation of the at least one induction heating element, external voltages independent of an operating condition, in particular in a heating operating condition.
  • at least one protection unit which is provided to protect at least the at least one detection circuit, in particular during an operation of the at least one induction heating element, external voltages independent of an operating condition, in particular in a heating operating condition.
  • the at least one protection unit is connected, independently of an operating state, between an input of the at least one detection circuit and a branch of the connection between the at least one heating frequency unit and the at least one induction heating element.
  • the protection unit is connected to the connection between the heating frequency unit and the induction heating element independently of an operating state on a side of the branch facing the detection circuit.
  • the protection unit is arranged independently of an operating state outside the power resonant circuit. This can be achieved in particular a durable design.
  • the at least one protection unit has at least one capacitor.
  • the capacitor differs from a capacitor of the power resonant circuit, in particular of a damping capacitor and / or a resonant capacitor. As a result, in particular a cost-effective design can be achieved.
  • the at least one detection circuit and the at least one induction heating element form a resonant circuit at least in an operating state, in particular outside a heating operating state.
  • a "resonant circuit” is to be understood, in particular, as a resonant-capable electrical circuit which comprises at least the induction heating element and at least one capacitance, which is in particular part of the detection circuit.
  • the detection circuit and the induction heating element are provided to perform electrical oscillations at least in one operating state. As a result, particularly set up cooking utensils can be detected precisely.
  • the induction hob device comprises a control unit which is provided to determine at least one cooking appliance characteristic as a function of a natural frequency change of the at least one detection circuit.
  • a control unit is intended in particular an electronic unit be understood, which is preferably at least partially integrated in a control and / or regulating unit of an induction hob and which is preferably provided to control at least the heating frequency unit and / or to regulate.
  • the control unit preferably comprises a computing unit and, in particular in addition to the computing unit, a memory unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit.
  • the control unit has at least one amplifier at least to an amplification of the detection current.
  • the control unit has at least one analog-to-digital converter at least for a conversion of the detection current.
  • the cooking utensil characteristic is designed as the presence and / or absence of erected cooking utensils.
  • the cooking utensil characteristic is designed as a size and / or shape and / or material of cooking utensils.
  • further embodiments of the cooking appliance characteristic appearing appropriate to a person skilled in the art are conceivable. This can be achieved in particular a high level of comfort for an operator.
  • the cooking utensil characteristic can be determined exactly.
  • the at least one detection circuit is provided to detect cooking utensils, in particular exclusively, outside a heating operating state.
  • the heating frequency unit in particular the buffering capacity of the heating frequency unit, is provided to prevent, in particular to block, the detection of upright cooking utensils in the heating operating state.
  • the buffering capacity is provided to short-circuit the detection circuit in the heating mode.
  • Fig. 1 shows an induction hob 30 with an induction hob apparatus 10 according to the invention.
  • the induction hob 30 has a base body 32 for setting up cooking utensils.
  • the main body 32 is formed as a hob plate.
  • the main body 32 forms a cooking surface.
  • the induction hob 30 comprises an operating unit 34 for input and / or selection of operating parameters, for example a heating power and / or a heating power density and / or a heating zone.
  • the operating unit 34 is provided for outputting a value of an operating parameter to an operator.
  • the induction hob device 10 comprises a control unit 28 which is provided to execute actions and / or to change settings in dependence on operating parameters entered by means of the operating unit 34.
  • the induction hob device 10 comprises a plurality of induction heating elements 12, which are provided for heating up cooking dishes (cf. Fig. 2 ).
  • the induction heating elements 12 form a variable cooking surface area.
  • the induction heating elements 12 form a hob matrix.
  • the induction heating elements are designed as classic induction heating elements and form a classic cooking surface. In this case, each induction heating element could form a separate heating zone for heating up cooking utensils.
  • the induction hob device 10 comprises a plurality of heating frequency units 16 for supplying the induction heating elements 12.
  • the heating frequency units 16 are part of a power current supply unit 48, which is used to supply the Induction heating 12 is provided.
  • Each heating frequency unit 16 includes an inverter.
  • Each heating frequency unit 16 includes two series-connected bidirectional unipolar switches.
  • Each heating frequency unit 16 comprises two buffer capacities 42 connected in series. In each case one buffer capacity 42 is connected in parallel with one of the unipolar switches.
  • the heating frequency units 16 In one operating state, the heating frequency units 16 generate high-frequency alternating current to supply the induction heating elements 12.
  • the high-frequency alternating current is designed as a heating current.
  • the heating current has a frequency of several kilohertz. For example, in a heating mode, the heating current could have a frequency between 25 kHz and 75 kHz. Alternatively, further frequencies which appear reasonable to a person skilled in the art are conceivable.
  • the heating frequency units 16 are connected by means of an electrically conductive connection 18 to the induction heating elements 12.
  • the induction heating elements 12 are connected to the heating frequency units 16 remote connection points 46 via a resonance unit 56 to ground.
  • the heating frequency units 16 in a heating operation state with the induction heating elements 12 and a part of the resonance unit 56 form a power circuit.
  • the induction hob device 10 includes the resonance unit 56.
  • the resonance unit 56 includes a resonance capacity for each induction heating element 12.
  • Each resonant capacitance has two capacitors.
  • the induction hob device 10 comprises a circuit unit 36 which is provided to make or break the connection 18 between the heating frequency units 16 and the induction heating elements 12.
  • the circuit unit 36 comprises a plurality of switching elements, wherein in each case one switching element is arranged in one of the connections 18 between one of the heating frequency units 16 and one of the induction heating elements 12.
  • the circuit unit 36 is controllable by the control unit 28.
  • an embodiment while avoiding a circuit unit is conceivable, wherein the heating frequency units and the induction heating are connected directly to each other (see. Fig. 4 ). In this case, the connection between the heating frequency units and the induction heating elements is uninterrupted, in particular electrically independent of an operating state.
  • the induction hob device 10 comprises a plurality of rectifiers 38, which are connected to a phase 40 of a supply network (see. Fig. 2 ).
  • the rectifiers 38 rectify an AC coupled through phase 40.
  • a rectifier 38 is connected to two Schufrequenzakuen 16.
  • Two Schufrequenzüen 16 are connected via a rectifier 38 to the phase 40 of the supply network.
  • the induction hob device 10 comprises a plurality of detection circuits 14. Each detection circuit 14 is provided in cooperation with a respective induction heating element 12 for the detection of erected cooking utensils. Each detection circuit 14 is directly connected to one of the induction heating elements 12 irrespective of an operating condition (see FIG. Fig. 3 ). The detection circuits 14 are connected to the induction heating elements 12 independently of a switching position of the circuit unit 36. In the present exemplary embodiment, each detection circuit 14 is connected to a connection point 44 of the induction heating element 12 facing the heating frequency unit 16. The detection circuits 14 are branched off from the connections 18 between the heating frequency units 16 and the induction heating elements 12. The branches 24 of the connections 18 between the heating frequency units 16 and the induction heating elements 12 are arranged between the heating frequency units 16 facing connection points 44 and the circuit unit 36.
  • the induction hob device 10 includes a plurality of protection units 20, which are provided to protect the detection circuits 14 from external stresses regardless of an operating state.
  • the protection units 20 are connected to the detection circuits 14 facing sides of the branches 24, regardless of an operating condition.
  • the protection units 20 are connected independently of an operating state between an input 22 of the detection circuits 14 and the branches 24 of the connections 18 between the heating frequency units 16 and the induction heating elements 12.
  • the protection units 20 each have a capacitor 26. In the present embodiment, the capacitors 26 have capacitances of substantially 100 pF.
  • the protection units 20 have, in a heating operation state for the heating current, a resistance of between 200 k ⁇ and 600 k ⁇ .
  • capacitors with a Capacity in a range of 50 pF to 150 pF preferably, capacitors with a Capacity in a range of 50 pF to 150 pF conceivable.
  • the protection unit could have any desired series and / or parallel connection of capacitors.
  • further protection units which appear sensible to a person skilled in the art are conceivable.
  • the induction hob device 10 comprises a sensor current supply unit 50, which is provided to supply the detection circuits 14 with detection current.
  • the sensor power supply unit 50 is provided to supply the control unit 28.
  • the sensor power supply unit 50 and the power power supply unit 48 are formed separately.
  • the sensor power supply unit 50 is connected to a phase 52 of the supply network.
  • the phase 52 to which the sensor current supply unit 50 is connected is different from the phase 40 to which the power current supply unit 48 is connected.
  • the power current supply unit and the sensor current supply unit are connected to the same phase. In both cases, the induction heating elements 12 and the detection circuits 14 are supplied independently.
  • the detection circuits 14 act in an operating state, the induction heating 12 with high-frequency alternating current, which is designed as a detection current.
  • the detection current has a frequency of a few MHz.
  • the detection current in an operating state could have a frequency between 1.5 MHz and 2.2 MHz.
  • the protection units 20 have a resistance for the detection current with a value between 0.7 k ⁇ and 1 k ⁇ .
  • one of the detection circuits 14 and one of the induction heating elements 12 each form a resonant circuit.
  • a frequency of the detection current is substantially 1.5 MHz.
  • Garware increases the frequency of the detection current depending on size, shape and material of set up Cooking containers.
  • an output 54 of one of the detection circuits 14 is connected to the control unit 28.
  • the output 54 of the detection circuit 14 is connected via the control unit 28 to ground.
  • the control unit 28 determines a Gargeschirrkennloshim in response to a natural frequency change of the detection circuit 14.
  • the control unit 28 determines on the basis of a size of the natural frequency change of the detection current size, shape and material of set up cooking utensils.
  • the connections 18 between the heating frequency units 16 and the induction heating elements 12 are interrupted by the circuit unit 36.
  • An operating state in which the detection circuits 14 detect cooking utensils set up is formed separately from a heating operation state in which the induction heating elements 12 heat up cooking utensils set up.
  • a heating mode at least one of the connections 18 between the heating frequency units 16 and the induction heating elements 12 is established.
  • the detection circuits 14 branched off from the connections 18 between the heating frequency units 16 and the induction heating elements 12 are short-circuited by the buffer capacities 42 of the heating frequency unit 16.
  • the buffer capacitances 42 have a low impedance at a frequency of the detection current, whereby the detection circuits 14 directly connected to the induction heating elements 12 are shorted.
  • high-frequency alternating currents having a substantially same frequency as the heating currents flow through the oscillation circuits formed by the induction heating elements 12 and the detection circuits 14.
  • the detection circuits 14 detect cooking utensils set up outside a heating operation state. Outside a heating operating state, detection currents flow through the oscillating circuits formed by the induction heating elements 12 and the detection circuits 14.
  • a number of detection circuits is less than a number of induction heating elements.
  • the detection circuits could be multiplexed with a plurality of induction heating elements, the protection unit being connected between the Multiplexer and the induction heating could be arranged. It is also conceivable that the protection unit is arranged between the multiplexer and the input of the detection circuit.
  • the outputs of the detection circuits are connected to the connection points of the induction heating elements facing away from the heating frequency units.
  • a further protection unit could be provided, in particular in addition to the protection unit which branches off from the connection between the heating frequency unit and the induction heating element.
  • control unit for enabling a heating operating state, in particular for operating the induction heating element, in particular exclusively when the cooking utensils are set up, and in particular to prevent them from being in a garish-free state.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Induction Heating Cooking Devices (AREA)

Description

Die Erfindung geht aus von einer Induktionskochfeldvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention is based on an induction hob apparatus according to the preamble of claim 1.

Aus der WO 2010/069788 A1 ist bereits eine Induktionskochfeldvorrichtung mit einem Induktionsheizelement, das zu einem Erhitzen von aufgestelltem Gargeschirr vorgesehen ist, und mit einem Detektionsschaltkreis, der in Zusammenwirken mit dem Induktionsheizelement zu einer Detektion von aufgestelltem Gargeschirr vorgesehen ist, bekannt. Das Induktionsheizelement wird über ein Relais entweder mit einer Heizfrequenzeinheit oder mit dem Detektionsschaltkreis verbunden. Der Detektionsschaltkreis ist somit nur in entsprechender Schaltstellung des Relais mit dem Induktionsheizelement verbunden.From the WO 2010/069788 A1 There is already known an induction hob apparatus with an induction heating element provided for heating up cooking utensils set up and with a detection circuit provided in cooperation with the induction heating element for detection of set up cooking utensils. The induction heating element is connected via a relay either to a heating frequency unit or to the detection circuit. The detection circuit is thus connected to the induction heating element only in the corresponding switching position of the relay.

Die Aufgabe der Erfindung besteht insbesondere darin, eine gattungsgemäße Vorrichtung mit einer vorteilhaften Konstruktion bereitzustellen. Die Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst, während vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung den Unteransprüchen entnommen werden können.The object of the invention is in particular to provide a generic device with an advantageous construction. The object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.

Die Erfindung geht aus von einer Induktionskochfeldvorrichtung mit zumindest einem Induktionsheizelement, das zu einem Erhitzen von Gargeschirr vorgesehen ist, und mit zumindest einem Detektionsschaltkreis, der in Zusammenwirken mit dem zumindest einen Induktionsheizelement zumindest zu einer Detektion von aufgestelltem Gargeschirr vorgesehen ist.The invention is based on an induction hob apparatus with at least one induction heating element which is provided for heating cooking utensils, and with at least one detection circuit which, in cooperation with the at least one induction heating element, is provided at least for the detection of erected cooking utensils.

Es wird vorgeschlagen, dass der zumindest eine Detektionsschaltkreis unabhängig von einem Betriebszustand direkt mit dem zumindest einen Induktionsheizelement verbunden ist. Unter einer "Induktionskochfeldvorrichtung" soll insbesondere ein Teil, insbesondere eine Unterbaugruppe, eines Induktionskochfelds verstanden werden. Unter einem "Induktionsheizelement" soll insbesondere ein gewickelter elektrischer Leiter verstanden werden, der in zumindest einem Betriebszustand von hochfrequentem Wechselstrom, insbesondere von Heizstrom, durchflossen ist. Insbesondere ist das Induktionsheizelement dazu vorgesehen, elektrische Energie in ein magnetisches Wechselfeld umzuwandeln, das dazu vorgesehen ist, in einem metallischen, vorzugsweise zumindest teilweise ferromagnetischen, Gargeschirr Wirbelströme und/oder Ummagnetisierungseffekte hervorzurufen, die in Wärme umgewandelt werden. Vorzugsweise ist das Induktionsheizelement dazu vorgesehen, eine Erwärmung des Gargeschirrs zu verursachen. Vorzugsweise umfasst die Induktionskochfeldvorrichtung zumindest zwei, insbesondere zumindest drei, vorteilhaft zumindest vier, besonders vorteilhaft zumindest acht, vorzugsweise zumindest zehn, besonders bevorzugt eine Vielzahl an Induktionsheizelementen. Unter einem "Detektionsschaltkreis" soll insbesondere ein elektrischer Schaltkreis verstanden werden, der in Abhängigkeit von in einer Einbaulage oberhalb des Induktionsheizelements aufgestelltem Gargeschirr zu einer Änderung zumindest einer Detektionskenngröße vorgesehen ist. Insbesondere ist der Detektionsschaltkreis zumindest in einem Betriebszustand von zumindest einem Detektionsstrom durchflossen. Insbesondere ist der Detektionsschaltkreis in Abhängigkeit von in einer Einbaulage oberhalb des Induktionsheizelements aufgestelltem Gargeschirr zu einer Änderung zumindest einer Frequenz des Detektionsstroms vorgesehen. Alternativ könnte der Detektionsschaltkreis in Abhängigkeit von in einer Einbaulage oberhalb des Induktionsheizelements aufgestelltem Gargeschirr zu einer Änderung zumindest eines Phasenwinkels des Detektionsstroms vorgesehen sein. Ebenfalls denkbar sind weitere, einem Fachmann als sinnvoll erscheinende Detektionskenngrößen. Vorzugsweise ist der Detektionsschaltkreis dazu vorgesehen, von zumindest einer Sensorstrom-Versorgungseinheit versorgt zu werden, die insbesondere getrennt von zumindest einer Leistungsstrom-Versorgungseinheit zu einer Versorgung des zumindest einen Induktionsheizelements ausgebildet ist. Vorzugsweise umfasst die Induktionskochfeldvorrichtung zumindest zwei, insbesondere zumindest drei, vorteilhaft zumindest vier, besonders vorteilhaft zumindest acht, vorzugsweise zumindest zehn, besonders bevorzugt eine Vielzahl an Detektionsschaltkreisen. Vorzugsweise ist eine Anzahl an Induktionsheizelementen und eine Anzahl an Detektionsschaltkreisen zumindest im Wesentlichen, insbesondere genau gleich. Alternativ ist denkbar, dass ein Detektionsschaltkreis mit zumindest zwei, insbesondere mit zumindest drei, vorteilhaft mit zumindest vier, besonders vorteilhaft mit einer Vielzahl an Induktionsheizelementen verbunden ist. Unter "unabhängig von einem Betriebszustand" soll insbesondere unabhängig von zumindest einer Stellung zumindest eines Schaltelements und/oder unabhängig von einem Stromfluss durch das Induktionsheizelement verstanden werden. Unter der Wendung, dass der Detektionsschaltkreis unabhängig von einem Betriebszustand "direkt" mit dem Induktionsheizelement verbunden ist, soll insbesondere verstanden werden, dass der Detektionsschaltkreis und das Induktionsheizelement in jedem Betriebszustand insbesondere zumindest für Wechselstrom einen geschlossenen Schaltkreis bilden. Insbesondere fließt in jedem Heizbetriebszustand elektrischer Strom, insbesondere Wechselstrom, durch den geschlossenen Schaltkreis. Insbesondere ist der Detektionsschaltkreis in jedem Betriebszustand von einem zu einem Heizstrom korrespondierenden Detektionsstrom durchflossen. Unabhängig von einem Betriebszustand existiert insbesondere zumindest eine, insbesondere zumindest für Wechselstrom, elektrisch leitende Verbindung zwischen dem Detektionsschaltkreis und dem Induktionsheizelement. Insbesondere ist eine Verbindung zwischen dem Detektionsschaltkreis und dem Induktionsheizelement frei von Schaltelementen, insbesondere von Relais und/oder Transistoren. Unter "vorgesehen" soll insbesondere speziell programmiert, ausgelegt und/oder ausgestattet verstanden werden. Darunter, dass ein Objekt zu einer bestimmten Funktion vorgesehen ist, soll insbesondere verstanden werden, dass das Objekt diese bestimmte Funktion in zumindest einem Anwendungs- und/oder Betriebszustand erfüllt und/oder ausführt.It is proposed that the at least one detection circuit is connected to the at least one induction heating element independently of an operating state. An "induction hob device" should be understood in particular to mean a part, in particular a subassembly, of an induction hob. An "induction heating element" is to be understood, in particular, as a wound electrical conductor, which in at least one operating state flows through high-frequency alternating current, in particular heating current. In particular, the induction heating element is intended to convert electrical energy into a magnetic alternating field, which is intended to be in a metallic, preferably at least partially ferromagnetic, garland eddy currents and / or Ummagnetisierungseffekte cause, which are converted into heat. Preferably, the induction heating element is intended to cause heating of the cooking utensil. Preferably, the induction hob device comprises at least two, in particular at least three, advantageously at least four, particularly advantageously at least eight, preferably at least ten, particularly preferably a plurality of induction heating elements. A "detection circuit" is to be understood, in particular, as an electrical circuit which is provided as a function of cooking utensils installed in an installed position above the induction heating element for changing at least one detection characteristic. In particular, the detection circuit flows through at least one operating state of at least one detection current. In particular, the detection circuit is provided as a function of cooking utensils installed in an installed position above the induction heating element for changing at least one frequency of the detection current. Alternatively, the detection circuit could be provided in response to a set up in an installed position above the induction heating Garware for changing at least one phase angle of the detection current. Also conceivable are further detection parameters that appear appropriate to a person skilled in the art. Preferably, the detection circuit is provided to be supplied by at least one sensor current supply unit, which is in particular formed separately from at least one power current supply unit to supply the at least one induction heating. Preferably, the induction hob device comprises at least two, in particular at least three, advantageously at least four, particularly advantageously at least eight, preferably at least ten, particularly preferably a plurality of detection circuits. Preferably, a number of induction heating elements and a number of detection circuits are at least substantially, in particular exactly the same. Alternatively, it is conceivable that a detection circuit with at least two, in particular with at least three, advantageously with at least four, particularly advantageously connected to a plurality of induction heating elements. The term "independent of an operating state" should be understood in particular independently of at least one position of at least one switching element and / or independent of a current flow through the induction heating element. The phrase that the detection circuit is "directly" connected to the induction heating element independently of an operating state is intended in particular be understood that the detection circuit and the induction heating in any operating condition, in particular at least for alternating current form a closed circuit. In particular, in each heating operating state, electric current, in particular alternating current, flows through the closed circuit. In particular, in each operating state, the detection circuit is traversed by a detection current corresponding to a heating current. Irrespective of an operating state, there is in particular at least one, in particular at least for alternating current, electrically conductive connection between the detection circuit and the induction heating element. In particular, a connection between the detection circuit and the induction heating element is free of switching elements, in particular of relays and / or transistors. By "provided" is intended to be understood in particular specially programmed, designed and / or equipped. The fact that an object is intended for a specific function should in particular mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.

Durch die erfindungsgemäße Ausgestaltung kann eine Induktionskochfeldvorrichtung mit einer vorteilhaften Konstruktion bereitgestellt werden. Insbesondere können geringe Produktionskosten erreicht werden. Insbesondere kann auf Schaltelemente zu einer Herstellung einer Verbindung zwischen dem Detektionsschaltkreis und dem Induktionsheizelement verzichtet werden. Insbesondere können Probleme aufgrund geringen Stroms durch Kontakte eines Schaltelements, insbesondere eines Relais, vermieden werden. Zudem kann vorteilhaft eine Detektion unabhängig von einer Schaltstellung eines Schaltelements, insbesondere eines Relais, vorgenommen werden.The inventive design, an induction hob device can be provided with an advantageous construction. In particular, low production costs can be achieved. In particular, switching elements can be dispensed with for establishing a connection between the detection circuit and the induction heating element. In particular, problems due to low current through contacts of a switching element, in particular a relay, can be avoided. In addition, a detection can advantageously be carried out independently of a switching position of a switching element, in particular of a relay.

Alternativ oder zusätzlich zu der erfindungsgemäßen Ausgestaltung wird eine Induktionskochfeldvorrichtung mit zumindest einem Induktionsheizelement vorgeschlagen, das Teil zumindest eines Leistungsschwingkreises und zumindest zu einem Erhitzen von Gargeschirr vorgesehen ist, und mit zumindest einem Detektionsschaltkreis, der zumindest zu einer Detektion von Gargeschirr vorgesehen ist und der in zumindest einem Betriebszustand das zumindest eine Induktionsheizelement umfasst, wobei der zumindest eine Detektionsschaltkreis zumindest eine Schutzeinheit aufweist, die an dem zumindest einen Induktionsheizelement angeschlossen ist und von dem zumindest einen Leistungsschwingkreis abzweigt. Die Schutzeinheit ist dabei insbesondere dazu vorgesehen, unabhängig von einem Betriebszustand, insbesondere zumindest in einem Heizbetriebszustand, wenigstens den zumindest einen Detektionsschaltkreis vor äußeren Spannungen zu schützen. Insbesondere ist die zumindest eine Schutzeinheit dazu vorgesehen, ein Eindringen von insbesondere hochfrequentem Heizstrom in den Detektionsschaltkreis zumindest im Wesentlichen zu verhindern. Vorzugsweise unterscheidet sich ein Wert einer Frequenz eines Detektionsstroms von einem Wert einer Frequenz eines Heizstroms um einen Faktor von mindestens 10, insbesondere von mindestens 100, vorteilhaft von mindestens 500, besonders vorteilhaft von mindestens 1000. Unter "äußeren Spannungen" sollen insbesondere Spannungen verstanden werden, die vorteilhaft in einem Betriebszustand über zumindest einer Heizfrequenzeinheit und/oder über dem zumindest einen Induktionsheizelement abfallen. Alternativ oder zusätzlich sollen unter "äußeren Spannungen" insbesondere Spannungen verstanden werden, die insbesondere dazu vorgesehen sind, in einem Betriebszustand zu einem Betreiben des zumindest einen Induktionsheizelements verwendet zu werden. Unter der Wendung, dass die Schutzeinheit dazu vorgesehen ist, ein Eindringen von insbesondere hochfrequentem Heizstrom in den Detektionsschaltkreis "zumindest im Wesentlichen zu verhindern", soll insbesondere verstanden werden, dass die Schutzeinheit dazu vorgesehen ist, einen Anteil von maximal 50 %, insbesondere von maximal 30 %, vorteilhaft von maximal 15 %, besonders vorteilhaft von maximal 10 %, vorzugsweise von maximal 5 % und besonders bevorzugt von maximal 2 % von auf einer Seite auf die Schutzeinheit auftreffendem Heizstrom an einem Passieren, insbesondere einem Erreichen einer der ersten Seite abgewandten zweiten Seite, der Schutzeinheit zu hindern. Dadurch kann insbesondere eine Induktionskochfeldvorrichtung mit einer vorteilhaften Konstruktion bereitgestellt werden, wobei vorteilhaft eine genaue Detektion von Gargeschirr erreicht werden kann.As an alternative or in addition to the embodiment according to the invention, an induction hob device with at least one induction heating element is proposed, which is part of at least one power circuit and at least heated cooking utensils, and with at least one detection circuit, which is provided at least for detection of cooking utensils and in at least an operating state comprising at least one induction heating element, wherein the at least one detection circuit has at least one protection unit which is connected to the at least one induction heating element and branches off from the at least one power resonant circuit. The protection unit is included In particular, it is provided to protect at least the at least one detection circuit from external voltages independently of an operating state, in particular at least in a heating operating state. In particular, the at least one protection unit is provided to at least substantially prevent the penetration of, in particular, high-frequency heating current into the detection circuit. Preferably, a value of a frequency of a detection current differs from a value of a frequency of a heating current by a factor of at least 10, in particular of at least 100, advantageously of at least 500, particularly advantageously of at least 1000. "External voltages" are to be understood in particular as voltages, which advantageously decrease in an operating state via at least one heating frequency unit and / or via the at least one induction heating element. Alternatively or additionally, the term "external stresses" should be understood to mean, in particular, voltages which are provided, in particular, for being used in an operating state for operating the at least one induction heating element. By the phrase that the protection unit is intended to "at least substantially prevent" in particular high-frequency heating current from entering the detection circuit, it should be understood, in particular, that the protection unit is intended to have a maximum proportion of 50%, in particular maximum 30%, advantageously of at most 15%, particularly advantageously of not more than 10%, preferably of not more than 5% and particularly preferably of not more than 2%, of heating current striking the protective unit on one side at a passing, in particular reaching a second one facing away from the first side Side to prevent the protection unit. Thereby, in particular, an induction hob device can be provided with an advantageous construction, wherein advantageously a precise detection of cooking utensils can be achieved.

Ferner wird vorgeschlagen, dass die Induktionskochfeldvorrichtung zumindest eine Heizfrequenzeinheit zu einer Versorgung des zumindest einen Induktionsheizelements umfasst, wobei der zumindest eine Detektionsschaltkreis von einer Verbindung zwischen der zumindest einen Heizfrequenzeinheit und dem zumindest einen Induktionsheizelement abgezweigt ist. Unter einer "Heizfrequenzeinheit" soll insbesondere eine elektrische Einheit verstanden werden, die ein oszillierendes elektrisches Signal, vorzugsweise mit einer Frequenz von zumindest 1 kHz, insbesondere von wenigstens 10 kHz, vorteilhaft von mindestens 20 kHz und insbesondere von maximal 100 kHz für zumindest ein Induktionsheizelement erzeugt. Insbesondere ist die Heizfrequenzeinheit dazu vorgesehen, eine, von dem Induktionsheizelement geforderte, maximale elektrische Leistung von zumindest 100 W, insbesondere zumindest 500 W, vorteilhaft zumindest 1000 W und vorzugsweise zumindest 1500 W bereitzustellen. Die Heizfrequenzeinheit umfasst vorteilhaft zumindest einen Wechselrichter, der vorzugsweise zumindest zwei, vorzugsweise in Reihe geschaltete, bidirektionale unipolare Schalter, die insbesondere von einem Transistor und einer parallel geschalteten Diode gebildet sind, und besonders vorteilhaft zumindest jeweils einen parallel zu den bidirektionalen unipolaren Schaltern geschaltete Pufferkapazität, die insbesondere von zumindest einem Kondensator gebildet ist, aufweist. Ein Spannungsabgriff der Heizfrequenzeinheit ist insbesondere an einer gemeinsamen Kontaktstelle zweier bidirektionaler unipolarer Schalter angeordnet. Insbesondere bilden die zumindest eine Heizfrequenzeinheit und das zumindest eine Induktionsheizelement zumindest in einem Betriebszustand den zumindest einen Leistungsschwingkreis aus. Unter einer "Verbindung" zwischen der Heizfrequenzeinheit und dem Induktionsheizelement soll insbesondere eine Überbrückung zumindest eines Abstands zwischen der Heizfrequenzeinheit und dem Induktionsheizelement verstanden werden, die in zumindest einem Betriebszustand elektrisch leitfähig ist. Beispielsweise könnte die Verbindung zwischen der Heizfrequenzeinheit und dem Induktionsheizelement direkt und/oder über zumindest ein Schaltelement erfolgen. Unter der Wendung, dass der Detektionsschaltkreis von einer Verbindung zwischen der Heizfrequenzeinheit und dem Induktionsheizelement "abgezweigt" ist, soll insbesondere verstanden werden, dass wenigstens eine und vorzugsweise genau eine elektrisch leitfähige Kontaktstelle existiert, mittels der der Detektionsschaltkreis an die Verbindung zwischen der Heizfrequenzeinheit und dem Induktionsheizelement angeschlossen ist. Dadurch kann insbesondere eine präzise Detektion von auf dem Induktionsheizelement aufgestelltem Gargeschirr erreicht werden.It is also proposed that the induction hob device comprises at least one heating frequency unit for supplying the at least one induction heating element, wherein the at least one detection circuit is branched off from a connection between the at least one heating frequency unit and the at least one induction heating element. A "heating frequency unit" should in particular be understood to mean an electrical unit which has an oscillating electrical signal, preferably with a frequency of at least 1 kHz, in particular of at least 10 kHz, advantageously of at least 20 kHz and in particular of not more than 100 kHz generates at least one induction heating element. In particular, the heating frequency unit is provided to provide a, required by the induction heating, maximum electrical power of at least 100 W, in particular at least 500 W, advantageously at least 1000 W and preferably at least 1500 W. The Heizfrequenzeinheit advantageously comprises at least one inverter, preferably at least two, preferably in series, bidirectional unipolar switches, which are formed in particular by a transistor and a parallel diode, and particularly advantageously at least one parallel to the bidirectional unipolar switches switched buffer capacity, which is in particular formed by at least one capacitor. A voltage tap of the heating frequency unit is arranged in particular at a common contact point of two bidirectional unipolar switches. In particular, the at least one heating frequency unit and the at least one induction heating element form the at least one power resonant circuit, at least in one operating state. A "connection" between the heating frequency unit and the induction heating element should in particular be understood as a bridging of at least one distance between the heating frequency unit and the induction heating element, which is electrically conductive in at least one operating state. For example, the connection between the heating frequency unit and the induction heating element could take place directly and / or via at least one switching element. By the term that the detection circuit is "branched off" from a connection between the heating frequency unit and the induction heating element, it should be understood in particular that at least one and preferably exactly one electrically conductive contact point exists by means of which the detection circuit connects to the connection between the heating frequency unit and the heating frequency unit Induction heating element is connected. This can be achieved in particular a precise detection of erected on the induction heating cookware.

Zudem wird vorgeschlagen, dass die Induktionskochfeldvorrichtung zumindest eine Schutzeinheit umfasst, die dazu vorgesehen ist, unabhängig von einem Betriebszustand, insbesondere zumindest in einem Heizbetriebszustand, wenigstens den zumindest einen Detektionsschaltkreis vor, insbesondere bei einem Betrieb des zumindest einen Induktionsheizelements auftretenden, äußeren Spannungen zu schützen. Dadurch kann insbesondere ein Eindringen von hochfrequentem Wechselstrom in den Detektionsschaltkreis vermieden werden. Insbesondere können Bauteile, die für Niederspannung ausgelegt sind, verwendet werden anstatt von Bauteilen, die auf hohe Leistung ausgelegt sind, wodurch insbesondere eine preiswerte Ausgestaltung erreicht werden kann.In addition, it is proposed that the induction hob apparatus comprise at least one protection unit which is provided to protect at least the at least one detection circuit, in particular during an operation of the at least one induction heating element, external voltages independent of an operating condition, in particular in a heating operating condition. As a result, in particular a penetration of high-frequency alternating current into the detection circuit can be avoided. In particular, components that are suitable for Low voltage are designed to be used instead of components that are designed for high performance, which in particular a low-cost design can be achieved.

Weiterhin wird vorgeschlagen, dass die zumindest eine Schutzeinheit unabhängig von einem Betriebszustand zwischen einem Eingang des zumindest einen Detektionsschaltkreises und einer Abzweigung von der Verbindung zwischen der zumindest einen Heizfrequenzeinheit und dem zumindest einen Induktionsheizelement angeschlossen ist. Insbesondere ist die Schutzeinheit unabhängig von einem Betriebszustand an einer dem Detektionsschaltkreis zugewandten Seite der Abzweigung von der Verbindung zwischen der Heizfrequenzeinheit und dem Induktionsheizelement angeschlossen. Insbesondere ist die Schutzeinheit unabhängig von einem Betriebszustand außerhalb des Leistungsschwingkreises angeordnet. Dadurch kann insbesondere eine langlebige Ausgestaltung erreicht werden.Furthermore, it is proposed that the at least one protection unit is connected, independently of an operating state, between an input of the at least one detection circuit and a branch of the connection between the at least one heating frequency unit and the at least one induction heating element. In particular, the protection unit is connected to the connection between the heating frequency unit and the induction heating element independently of an operating state on a side of the branch facing the detection circuit. In particular, the protection unit is arranged independently of an operating state outside the power resonant circuit. This can be achieved in particular a durable design.

Ferner wird vorgeschlagen, dass die zumindest eine Schutzeinheit zumindest einen Kondensator aufweist. Insbesondere unterscheidet sich der Kondensator von einem Kondensator des Leistungsschwingkreises, insbesondere von einem Dämpfungskondensator und/oder einem Resonanzkondensator. Dadurch kann insbesondere eine kostengünstige Ausgestaltung erreicht werden.It is also proposed that the at least one protection unit has at least one capacitor. In particular, the capacitor differs from a capacitor of the power resonant circuit, in particular of a damping capacitor and / or a resonant capacitor. As a result, in particular a cost-effective design can be achieved.

Zudem wird vorgeschlagen, dass der zumindest eine Detektionsschaltkreis und das zumindest eine Induktionsheizelement wenigstens in einem Betriebszustand, insbesondere außerhalb eines Heizbetriebszustands, einen Schwingkreis ausbilden. Unter einem "Schwingkreis" soll insbesondere ein resonanzfähiger elektrischer Schaltkreis verstanden werden, der zumindest das Induktionsheizelement und zumindest eine Kapazität, die insbesondere Teil des Detektionsschaltkreises ist, umfasst. Insbesondere sind der Detektionsschaltkreis und das Induktionsheizelement dazu vorgesehen, zumindest in einem Betriebszustand elektrische Schwingungen auszuführen. Dadurch kann insbesondere aufgestelltes Gargeschirr präzise detektiert werden.In addition, it is proposed that the at least one detection circuit and the at least one induction heating element form a resonant circuit at least in an operating state, in particular outside a heating operating state. A "resonant circuit" is to be understood, in particular, as a resonant-capable electrical circuit which comprises at least the induction heating element and at least one capacitance, which is in particular part of the detection circuit. In particular, the detection circuit and the induction heating element are provided to perform electrical oscillations at least in one operating state. As a result, particularly set up cooking utensils can be detected precisely.

Weiterhin wird vorgeschlagen, dass die Induktionskochfeldvorrichtung eine Steuereinheit umfasst, die dazu vorgesehen ist, in Abhängigkeit von einer Eigenfrequenzänderung des zumindest einen Detektionsschaltkreises wenigstens eine Gargeschirrkenngröße zu ermitteln. Unter einer "Steuereinheit" soll insbesondere eine elektronische Einheit verstanden werden, die vorzugsweise in einer Steuer- und/oder Regeleinheit eines Induktionskochfelds zumindest teilweise integriert ist und die vorzugsweise dazu vorgesehen ist, zumindest die Heizfrequenzeinheit zu steuern und/oder zu regeln. Vorzugsweise umfasst die Steuereinheit eine Recheneinheit und insbesondere zusätzlich zur Recheneinheit eine Speichereinheit mit einem darin gespeicherten Steuer- und/oder Regelprogramm, das dazu vorgesehen ist, von der Recheneinheit ausgeführt zu werden. Insbesondere weist die Steuereinheit zumindest einen Verstärker zumindest zu einer Verstärkung des Detektionsstroms auf. Insbesondere weist die Steuereinheit zumindest einen Analog-Digital-Konverter zumindest zu einer Konvertierung des Detektionsstroms auf. Insbesondere ist die Gargeschirrkenngröße als Anwesenheit und/oder Abwesenheit von aufgestelltem Gargeschirr ausgebildet. Insbesondere ist die Gargeschirrkenngröße als Größe und/oder Form und/oder Material von aufgestelltem Gargeschirr ausgebildet. Alternativ sind weitere, einem Fachmann als sinnvoll erscheinende Ausgestaltungen der Gargeschirrkenngröße denkbar. Dadurch kann insbesondere ein hoher Komfort für einen Bediener erreicht werden. Insbesondere kann die Gargeschirrkenngröße exakt ermittelt werden.Furthermore, it is proposed that the induction hob device comprises a control unit which is provided to determine at least one cooking appliance characteristic as a function of a natural frequency change of the at least one detection circuit. Under a "control unit" is intended in particular an electronic unit be understood, which is preferably at least partially integrated in a control and / or regulating unit of an induction hob and which is preferably provided to control at least the heating frequency unit and / or to regulate. The control unit preferably comprises a computing unit and, in particular in addition to the computing unit, a memory unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit. In particular, the control unit has at least one amplifier at least to an amplification of the detection current. In particular, the control unit has at least one analog-to-digital converter at least for a conversion of the detection current. In particular, the cooking utensil characteristic is designed as the presence and / or absence of erected cooking utensils. In particular, the cooking utensil characteristic is designed as a size and / or shape and / or material of cooking utensils. Alternatively, further embodiments of the cooking appliance characteristic appearing appropriate to a person skilled in the art are conceivable. This can be achieved in particular a high level of comfort for an operator. In particular, the cooking utensil characteristic can be determined exactly.

Ferner wird vorgeschlagen, dass der zumindest eine Detektionsschaltkreis dazu vorgesehen ist, Gargeschirr, insbesondere ausschließlich, außerhalb eines Heizbetriebszustands zu detektieren. Insbesondere ist die Heizfrequenzeinheit, insbesondere die Pufferkapazität der Heizfrequenzeinheit, dazu vorgesehen, eine Detektion von aufgestelltem Gargeschirr in dem Heizbetriebszustand zu verhindern, insbesondere zu blockieren. Insbesondere ist die Pufferkapazität dazu vorgesehen, in dem Heizbetriebszustand den Detektionsschaltkreis kurzzuschließen. Dadurch kann insbesondere eine langlebige und/oder kostengünstige Ausgestaltung erreicht werden.It is also proposed that the at least one detection circuit is provided to detect cooking utensils, in particular exclusively, outside a heating operating state. In particular, the heating frequency unit, in particular the buffering capacity of the heating frequency unit, is provided to prevent, in particular to block, the detection of upright cooking utensils in the heating operating state. In particular, the buffering capacity is provided to short-circuit the detection circuit in the heating mode. As a result, in particular a durable and / or cost-effective design can be achieved.

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Es zeigen:

Fig. 1
ein Induktionskochfeld mit einer erfindungsgemäßen Induktionskochfeldvorrichtung in einer schematischen Draufsicht,
Fig. 2
ein Anwendungsbeispiel der Induktionskochfeldvorrichtung aus Fig. 1 in einer schematischen Darstellung,
Fig. 3
einen Ausschnitt der Induktionskochfeldvorrichtung aus Fig. 1 in einer stark vereinfachten, schematischen Darstellung und
Fig. 4
einen Ausschnitt einer alternativen Ausgestaltung der erfindungsgemäßen Induktionskochfeldvorrichtung aus Fig. 1 in einer stark vereinfachten, schematischen Darstellung.
Show it:
Fig. 1
an induction hob with an induction hob device according to the invention in a schematic plan view,
Fig. 2
an application example of the induction hob device Fig. 1 in a schematic representation,
Fig. 3
a section of the induction hob device Fig. 1 in a highly simplified, schematic representation and
Fig. 4
a section of an alternative embodiment of the induction hob according to the invention from Fig. 1 in a highly simplified, schematic representation.

Fig. 1 zeigt ein Induktionskochfeld 30 mit einer erfindungsgemäßen Induktionskochfeldvorrichtung 10. Das Induktionskochfeld 30 weist einen Grundkörper 32 zu einem Aufstellen von Gargeschirren auf. Der Grundkörper 32 ist als Kochfeldplatte ausgebildet. Der Grundkörper 32 bildet eine Kochfläche aus. Das Induktionskochfeld 30 umfasst eine Bedieneinheit 34 zu einer Eingabe und/oder Auswahl von Betriebsparametern, beispielsweise einer Heizleistung und/oder einer Heizleistungsdichte und/oder einer Heizzone. Die Bedieneinheit 34 ist zu einer Ausgabe eines Werts eines Betriebsparameters an einen Bediener vorgesehen. Die Induktionskochfeldvorrichtung 10 umfasst eine Steuereinheit 28, die dazu vorgesehen ist, in Abhängigkeit von mittels der Bedieneinheit 34 eingegebener Betriebsparameter Aktionen auszuführen und/oder Einstellungen zu verändern. Fig. 1 shows an induction hob 30 with an induction hob apparatus 10 according to the invention. The induction hob 30 has a base body 32 for setting up cooking utensils. The main body 32 is formed as a hob plate. The main body 32 forms a cooking surface. The induction hob 30 comprises an operating unit 34 for input and / or selection of operating parameters, for example a heating power and / or a heating power density and / or a heating zone. The operating unit 34 is provided for outputting a value of an operating parameter to an operator. The induction hob device 10 comprises a control unit 28 which is provided to execute actions and / or to change settings in dependence on operating parameters entered by means of the operating unit 34.

Die Induktionskochfeldvorrichtung 10 umfasst mehrere Induktionsheizelemente 12, die zu einem Erhitzen von aufgestelltem Gargeschirr vorgesehen sind (vgl. Fig. 2). In Fig. 2 sind der Übersichtlichkeit halber von mehrfach vorhandenen Bauteilen und/oder Objekten lediglich eines mit einem Bezugszeichen versehen. Die Induktionsheizelemente 12 bilden einen variablen Kochflächenbereich aus. Die Induktionsheizelemente 12 bilden eine Kochfeldmatrix aus. In einer alternativen Ausgestaltung ist denkbar, dass die Induktionsheizelemente als klassische Induktionsheizelemente ausgebildet sind und eine klassische Kochfläche ausbilden. Hierbei könnte jedes Induktionsheizelement eine separate Heizzone zu einem Erhitzen von aufgestelltem Gargeschirr ausbilden.The induction hob device 10 comprises a plurality of induction heating elements 12, which are provided for heating up cooking dishes (cf. Fig. 2 ). In Fig. 2 For the sake of clarity, of multiply existing components and / or objects, only one is provided with a reference numeral. The induction heating elements 12 form a variable cooking surface area. The induction heating elements 12 form a hob matrix. In an alternative embodiment, it is conceivable that the induction heating elements are designed as classic induction heating elements and form a classic cooking surface. In this case, each induction heating element could form a separate heating zone for heating up cooking utensils.

Die Induktionskochfeldvorrichtung 10 umfasst mehrere Heizfrequenzeinheiten 16 zu einer Versorgung der Induktionsheizelemente 12. Die Heizfrequenzeinheiten 16 sind Teil einer Leistungsstrom-Versorgungseinheit 48, die zu einer Versorgung der Induktionsheizelemente 12 vorgesehen ist. Jede Heizfrequenzeinheit 16 umfasst einen Wechselrichter. Jede Heizfrequenzeinheit 16 umfasst zwei in Reihe geschaltete bidirektionale unipolare Schalter. Jede Heizfrequenzeinheit 16 umfasst zwei in Reihe geschaltete Pufferkapazitäten 42. Jeweils eine Pufferkapazität 42 ist parallel zu einem der unipolaren Schalter geschalten. In einem Betriebszustand erzeugen die Heizfrequenzeinheiten 16 hochfrequenten Wechselstrom zu einer Versorgung der Induktionsheizelemente 12. Der hochfrequente Wechselstrom ist als Heizstrom ausgebildet. Der Heizstrom weist eine Frequenz von mehreren Kilohertz auf. Beispielsweise könnte der Heizstrom in einem Heizbetriebszustand eine Frequenz zwischen 25 kHz und 75 kHz aufweisen. Alternativ sind weitere, einem Fachmann als sinnvoll erscheinende Frequenzen denkbar.The induction hob device 10 comprises a plurality of heating frequency units 16 for supplying the induction heating elements 12. The heating frequency units 16 are part of a power current supply unit 48, which is used to supply the Induction heating 12 is provided. Each heating frequency unit 16 includes an inverter. Each heating frequency unit 16 includes two series-connected bidirectional unipolar switches. Each heating frequency unit 16 comprises two buffer capacities 42 connected in series. In each case one buffer capacity 42 is connected in parallel with one of the unipolar switches. In one operating state, the heating frequency units 16 generate high-frequency alternating current to supply the induction heating elements 12. The high-frequency alternating current is designed as a heating current. The heating current has a frequency of several kilohertz. For example, in a heating mode, the heating current could have a frequency between 25 kHz and 75 kHz. Alternatively, further frequencies which appear reasonable to a person skilled in the art are conceivable.

Die Heizfrequenzeinheiten 16 sind mittels jeweils einer elektrisch leitenden Verbindung 18 mit den Induktionsheizelementen 12 verbunden. Die Induktionsheizelemente 12 sind mit den Heizfrequenzeinheiten 16 abgewandten Anschlusspunkten 46 über eine Resonanzeinheit 56 mit Masse verbunden. Die Heizfrequenzeinheiten 16 bilden in einem Heizbetriebszustand mit den Induktionsheizelementen 12 und einem Teil der Resonanzeinheit 56 einen Leistungsschwingkreis aus. Die Induktionskochfeldvorrichtung 10 umfasst die Resonanzeinheit 56. Die Resonanzeinheit 56 umfasst für jedes Induktionsheizelement 12 eine Resonanzkapazität. Jede Resonanzkapazität weist zwei Kondensatoren auf.The heating frequency units 16 are connected by means of an electrically conductive connection 18 to the induction heating elements 12. The induction heating elements 12 are connected to the heating frequency units 16 remote connection points 46 via a resonance unit 56 to ground. The heating frequency units 16 in a heating operation state with the induction heating elements 12 and a part of the resonance unit 56 form a power circuit. The induction hob device 10 includes the resonance unit 56. The resonance unit 56 includes a resonance capacity for each induction heating element 12. Each resonant capacitance has two capacitors.

Die Induktionskochfeldvorrichtung 10 umfasst eine Schaltungseinheit 36, die dazu vorgesehen ist, die Verbindung 18 zwischen den Heizfrequenzeinheiten 16 und den Induktionsheizelementen 12 herzustellen oder zu unterbrechen. Die Schaltungseinheit 36 umfasst mehrere Schaltelemente, wobei jeweils ein Schaltelement in einer der Verbindungen 18 zwischen einer der Heizfrequenzeinheiten 16 und einem der Induktionsheizelemente 12 angeordnet ist. Die Schaltungseinheit 36 ist von der Steuereinheit 28 steuerbar. Alternativ ist eine Ausgestaltung unter Vermeidung einer Schaltungseinheit denkbar, wobei die Heizfrequenzeinheiten und die Induktionsheizelemente direkt miteinander verbunden sind (vgl. Fig. 4). Hierbei ist die Verbindung zwischen den Heizfrequenzeinheiten und den Induktionsheizelementen ununterbrochen, insbesondere unabhängig von einem Betriebszustand elektrisch leitend.The induction hob device 10 comprises a circuit unit 36 which is provided to make or break the connection 18 between the heating frequency units 16 and the induction heating elements 12. The circuit unit 36 comprises a plurality of switching elements, wherein in each case one switching element is arranged in one of the connections 18 between one of the heating frequency units 16 and one of the induction heating elements 12. The circuit unit 36 is controllable by the control unit 28. Alternatively, an embodiment while avoiding a circuit unit is conceivable, wherein the heating frequency units and the induction heating are connected directly to each other (see. Fig. 4 ). In this case, the connection between the heating frequency units and the induction heating elements is uninterrupted, in particular electrically independent of an operating state.

Die Induktionskochfeldvorrichtung 10 umfasst mehrere Gleichrichter 38, die an eine Phase 40 eines Versorgungsnetzes angeschlossen sind (vgl. Fig. 2). Die Gleichrichter 38 richten einen über die Phase 40 eingekoppelten Wechselstrom gleich. Jeweils ein Gleichrichter 38 ist mit zwei Heizfrequenzeinheiten 16 verbunden. Jeweils zwei Heizfrequenzeinheiten 16 sind über einen Gleichrichter 38 an die Phase 40 des Versorgungsnetzes angeschlossen.The induction hob device 10 comprises a plurality of rectifiers 38, which are connected to a phase 40 of a supply network (see. Fig. 2 ). The rectifiers 38 rectify an AC coupled through phase 40. In each case a rectifier 38 is connected to two Heizfrequenzeinheiten 16. Two Heizfrequenzeinheiten 16 are connected via a rectifier 38 to the phase 40 of the supply network.

Die Induktionskochfeldvorrichtung 10 umfasst mehrere Detektionsschaltkreise 14. Jeder Detektionsschaltkreis 14 ist in Zusammenwirken mit jeweils einem Induktionsheizelement 12 zu einer Detektion von aufgestelltem Gargeschirr vorgesehen. Jeder Detektionsschaltkreis 14 ist unabhängig von einem Betriebszustand direkt mit einem der Induktionsheizelemente 12 verbunden (vgl. Fig. 3). Die Detektionsschaltkreise 14 sind unabhängig von einer Schaltstellung der Schaltungseinheit 36 direkt mit den Induktionsheizelementen 12 verbunden. Im vorliegenden Ausführungsbeispiel ist jeder Detektionsschaltkreis 14 mit einem der Heizfrequenzeinheit 16 zugewandten Anschlusspunkt 44 des Induktionsheizelements 12 verbunden. Die Detektionsschaltkreise 14 sind von den Verbindungen 18 zwischen den Heizfrequenzeinheiten 16 und den Induktionsheizelementen 12 abgezweigt. Die Abzweigungen 24 von den Verbindungen 18 zwischen den Heizfrequenzeinheiten 16 und den Induktionsheizelementen 12 sind zwischen den den Heizfrequenzeinheiten 16 zugewandten Anschlusspunkten 44 und der Schaltungseinheit 36 angeordnet.The induction hob device 10 comprises a plurality of detection circuits 14. Each detection circuit 14 is provided in cooperation with a respective induction heating element 12 for the detection of erected cooking utensils. Each detection circuit 14 is directly connected to one of the induction heating elements 12 irrespective of an operating condition (see FIG. Fig. 3 ). The detection circuits 14 are connected to the induction heating elements 12 independently of a switching position of the circuit unit 36. In the present exemplary embodiment, each detection circuit 14 is connected to a connection point 44 of the induction heating element 12 facing the heating frequency unit 16. The detection circuits 14 are branched off from the connections 18 between the heating frequency units 16 and the induction heating elements 12. The branches 24 of the connections 18 between the heating frequency units 16 and the induction heating elements 12 are arranged between the heating frequency units 16 facing connection points 44 and the circuit unit 36.

Die Induktionskochfeldvorrichtung 10 umfasst mehrere Schutzeinheiten 20, die dazu vorgesehen sind, unabhängig von einem Betriebszustand die Detektionsschaltkreise 14 vor äußeren Spannungen zu schützen. Die Schutzeinheiten 20 sind unabhängig von einem Betriebszustand an den Detektionsschaltkreisen 14 zugewandten Seiten der Abzweigungen 24 angeschlossen. Die Schutzeinheiten 20 sind unabhängig von einem Betriebszustand zwischen einem Eingang 22 der Detektionsschaltkreise 14 und den Abzweigungen 24 von den Verbindungen 18 zwischen den Heizfrequenzeinheiten 16 und den Induktionsheizelementen 12 angeschlossen. Die Schutzeinheiten 20 weisen jeweils einen Kondensator 26 auf. Im vorliegenden Ausführungsbeispiel weisen die Kondensatoren 26 Kapazitäten von im Wesentlichen 100 pF auf. Die Schutzeinheiten 20 weisen in einem Heizbetriebszustand für den Heizstrom einen Widerstand mit einem Wert zwischen 200 kΩ und 600 kΩ auf. Alternativ sind vorzugsweise Kondensatoren mit einer Kapazität in einem Bereich von 50 pF bis 150 pF denkbar. Zusätzlich oder alternativ könnte die Schutzeinheit eine beliebige Reihen- und/oder Parallelschaltung von Kondensatoren aufweisen. Zudem sind alternativ zu einem Kondensator weitere, einem Fachmann als sinnvoll erscheinende Schutzeinheiten denkbar.The induction hob device 10 includes a plurality of protection units 20, which are provided to protect the detection circuits 14 from external stresses regardless of an operating state. The protection units 20 are connected to the detection circuits 14 facing sides of the branches 24, regardless of an operating condition. The protection units 20 are connected independently of an operating state between an input 22 of the detection circuits 14 and the branches 24 of the connections 18 between the heating frequency units 16 and the induction heating elements 12. The protection units 20 each have a capacitor 26. In the present embodiment, the capacitors 26 have capacitances of substantially 100 pF. The protection units 20 have, in a heating operation state for the heating current, a resistance of between 200 kΩ and 600 kΩ. Alternatively, preferably, capacitors with a Capacity in a range of 50 pF to 150 pF conceivable. Additionally or alternatively, the protection unit could have any desired series and / or parallel connection of capacitors. In addition, as an alternative to a capacitor, further protection units which appear sensible to a person skilled in the art are conceivable.

Die Induktionskochfeldvorrichtung 10 umfasst eine Sensorstrom-Versorgungseinheit 50, die zu einer Versorgung der Detektionsschaltkreise 14 mit Detektionsstrom vorgesehen ist. Die Sensorstrom-Versorgungseinheit 50 ist zu einer Versorgung der Steuereinheit 28 vorgesehen. Die Sensorstrom-Versorgungseinheit 50 und die Leistungsstrom-Versorgungseinheit 48 sind getrennt ausgebildet. Die Sensorstrom-Versorgungseinheit 50 ist an eine Phase 52 des Versorgungsnetzes angeschlossen. Die Phase 52, an die die Sensorstrom-Versorgungseinheit 50 angeschlossen ist, ist von der Phase 40, an die die Leistungsstrom-Versorgungseinheit 48 angeschlossen ist, verschieden. Alternativ ist denkbar, dass die Leistungsstrom-Versorgungseinheit und die Sensorstrom-Versorgungseinheit an die gleiche Phase angeschlossen sind. In beiden Fällen werden die Induktionsheizelemente 12 und die Detektionsschaltkreise 14 unabhängig voneinander versorgt.The induction hob device 10 comprises a sensor current supply unit 50, which is provided to supply the detection circuits 14 with detection current. The sensor power supply unit 50 is provided to supply the control unit 28. The sensor power supply unit 50 and the power power supply unit 48 are formed separately. The sensor power supply unit 50 is connected to a phase 52 of the supply network. The phase 52 to which the sensor current supply unit 50 is connected is different from the phase 40 to which the power current supply unit 48 is connected. Alternatively, it is conceivable that the power current supply unit and the sensor current supply unit are connected to the same phase. In both cases, the induction heating elements 12 and the detection circuits 14 are supplied independently.

In einem Verfahren zum Betrieb der Induktionskochfeldvorrichtung 10 wird in Zusammenwirken der Detektionsschaltkreise 14 und der Induktionsheizelemente 12 aufgestelltes Gargeschirr detektiert. Die Detektionsschaltkreise 14 beaufschlagen in einem Betriebszustand die Induktionsheizelemente 12 mit hochfrequentem Wechselstrom, der als Detektionsstrom ausgebildet ist. Der Detektionsstrom weist eine Frequenz von einigen MHz auf. Beispielsweise könnte der Detektionsstrom in einem Betriebszustand eine Frequenz zwischen 1,5 MHz und 2,2 MHz aufweisen. Alternativ sind weitere, einem Fachmann als sinnvoll erscheinende Frequenzen denkbar. Die Schutzeinheiten 20 weisen für den Detektionsstrom einen Widerstand mit einem Wert zwischen 0,7 kΩ und 1 kΩ auf. In dem Betriebszustand bildet einer der Detektionsschaltkreise 14 und eines der Induktionsheizelemente 12 jeweils einen Schwingkreis aus.In a method for operating the induction hob device 10, cooking equipment placed in cooperation with the detection circuits 14 and the induction heating elements 12 is detected. The detection circuits 14 act in an operating state, the induction heating 12 with high-frequency alternating current, which is designed as a detection current. The detection current has a frequency of a few MHz. For example, the detection current in an operating state could have a frequency between 1.5 MHz and 2.2 MHz. Alternatively, further frequencies which appear reasonable to a person skilled in the art are conceivable. The protection units 20 have a resistance for the detection current with a value between 0.7 kΩ and 1 kΩ. In the operating state, one of the detection circuits 14 and one of the induction heating elements 12 each form a resonant circuit.

Im Fall eines Induktionsheizelements 12, das frei von aufgestelltem Gargeschirr ist, beträgt eine Frequenz des Detektionsstroms im Wesentlichen 1,5 MHz. Bei auf dem Induktionsheizelement 12 aufgestelltem Gargeschirr erhöht sich die Frequenz des Detektionsstroms in Abhängigkeit von Größe, Form und Material von aufgestelltem Gargeschirr. Jeweils ein Ausgang 54 eines der Detektionsschaltkreise 14 ist mit der Steuereinheit 28 verbunden. Der Ausgang 54 des Detektionsschaltkreises 14 ist über die Steuereinheit 28 mit Masse verbunden. Die Steuereinheit 28 ermittelt in Abhängigkeit von einer Eigenfrequenzänderung des Detektionsschaltkreises 14 eine Gargeschirrkenngröße. Die Steuereinheit 28 ermittelt anhand einer Größe der Eigenfrequenzänderung des Detektionsstroms Größe, Form und Material von aufgestelltem Gargeschirr.In the case of an induction heating element 12 that is free of cooking utensils installed, a frequency of the detection current is substantially 1.5 MHz. When set up on the induction heater 12 Garware increases the frequency of the detection current depending on size, shape and material of set up Cooking containers. In each case an output 54 of one of the detection circuits 14 is connected to the control unit 28. The output 54 of the detection circuit 14 is connected via the control unit 28 to ground. The control unit 28 determines a Gargeschirrkenngröße in response to a natural frequency change of the detection circuit 14. The control unit 28 determines on the basis of a size of the natural frequency change of the detection current size, shape and material of set up cooking utensils.

In einem Betriebszustand, in dem die Detektionsschaltkreise 14 aufgestelltes Gargeschirr detektieren, sind die Verbindungen 18 zwischen den Heizfrequenzeinheiten 16 und den Induktionsheizelementen 12 durch die Schaltungseinheit 36 unterbrochen. Ein Betriebszustand, in dem die Detektionsschaltkreise 14 aufgestelltes Gargeschirr detektieren, ist getrennt von einem Heizbetriebszustand ausgebildet, in dem die Induktionsheizelemente 12 aufgestelltes Gargeschirr erhitzen.In an operating state in which the detection circuits 14 detect cooking utensils installed, the connections 18 between the heating frequency units 16 and the induction heating elements 12 are interrupted by the circuit unit 36. An operating state in which the detection circuits 14 detect cooking utensils set up is formed separately from a heating operation state in which the induction heating elements 12 heat up cooking utensils set up.

In einem Heizbetriebszustand ist wenigstens eine der Verbindungen 18 zwischen den Heizfrequenzeinheiten 16 und den Induktionsheizelementen 12 hergestellt. In einem Heizbetriebszustand sind die von den Verbindungen 18 zwischen den Heizfrequenzeinheiten 16 und den Induktionsheizelementen 12 abgezweigten Detektionsschaltkreise 14 durch die Pufferkapazitäten 42 der Heizfrequenzeinheit 16 kurzgeschlossen. Die Pufferkapazitäten 42 weisen bei einer Frequenz des Detektionsstroms eine geringe Impedanz auf, wodurch die direkt mit den Induktionsheizelementen 12 verbundenen Detektionsschaltkreise 14 kurgeschlossen sind. In einem Heizbetriebszustand fließt durch die von den Induktionsheizelementen 12 und den Detektionsschaltkreisen 14 gebildeten Schwingkreise hochfrequente Wechselströme, die eine im Wesentlichen gleiche Frequenz wie die Heizströme aufweisen. Die Detektionsschaltkreise 14 detektieren aufgestelltes Gargeschirr außerhalb eines Heizbetriebszustands. Außerhalb eines Heizbetriebszustands fließen durch die von den Induktionsheizelementen 12 und den Detektionsschaltkreisen 14 gebildeten Schwingkreise Detektionsströme.In a heating mode, at least one of the connections 18 between the heating frequency units 16 and the induction heating elements 12 is established. In a heating operation state, the detection circuits 14 branched off from the connections 18 between the heating frequency units 16 and the induction heating elements 12 are short-circuited by the buffer capacities 42 of the heating frequency unit 16. The buffer capacitances 42 have a low impedance at a frequency of the detection current, whereby the detection circuits 14 directly connected to the induction heating elements 12 are shorted. In a heating operation state, high-frequency alternating currents having a substantially same frequency as the heating currents flow through the oscillation circuits formed by the induction heating elements 12 and the detection circuits 14. The detection circuits 14 detect cooking utensils set up outside a heating operation state. Outside a heating operating state, detection currents flow through the oscillating circuits formed by the induction heating elements 12 and the detection circuits 14.

In einer alternativen Ausgestaltung ist denkbar, dass eine Anzahl von Detektionsschaltkreisen geringer ist als eine Anzahl an Induktionsheizelementen. Hierbei könnten die Detektionsschaltkreise durch Multiplexing mit mehreren Induktionsheizelementen verbunden sein, wobei die Schutzeinheit zwischen dem Multiplexer und den Induktionsheizelementen angeordnet sein könnte. Ebenfalls denkbar ist, dass die Schutzeinheit zwischen dem Multiplexer und dem Eingang des Detektionsschaltkreises angeordnet ist.In an alternative embodiment, it is conceivable that a number of detection circuits is less than a number of induction heating elements. In this case, the detection circuits could be multiplexed with a plurality of induction heating elements, the protection unit being connected between the Multiplexer and the induction heating could be arranged. It is also conceivable that the protection unit is arranged between the multiplexer and the input of the detection circuit.

Alternativ zu Verbindungen der Ausgänge der Detektionsschaltkreise an Masse ist denkbar, dass die Ausgänge der Detektionsschaltkreise mit den den Heizfrequenzeinheiten abgewandten Anschlusspunkten der Induktionsheizelemente verbunden sind. Hierbei könnte zwischen den Ausgängen der Detektionsschaltkreise und den den Heizfrequenzeinheiten abgewandten Anschlusspunkten der Induktionsheizelemente jeweils eine weitere Schutzeinheit, insbesondere zusätzlich zu der Schutzeinheit, die von der Verbindung zwischen der Heizfrequenzeinheit und dem Induktionsheizelement abzweigt, vorgesehen sein.As an alternative to connecting the outputs of the detection circuits to ground, it is conceivable that the outputs of the detection circuits are connected to the connection points of the induction heating elements facing away from the heating frequency units. In this case, between the outputs of the detection circuits and the connection points of the induction heating elements facing away from the heating frequency units, a further protection unit could be provided, in particular in addition to the protection unit which branches off from the connection between the heating frequency unit and the induction heating element.

Beispielsweise ist denkbar, dass die Steuereinheit dazu vorgesehen ist, einen Heizbetriebszustand, insbesondere ein Betreiben des Induktionsheizelements, insbesondere ausschließlich bei aufgestelltem Gargeschirr zu ermöglichen und insbesondere in gargeschirrfreiem Zustand zu verhindern.For example, it is conceivable for the control unit to be provided for enabling a heating operating state, in particular for operating the induction heating element, in particular exclusively when the cooking utensils are set up, and in particular to prevent them from being in a garish-free state.

Bezugszeichenreference numeral

1010
InduktionskochfeldvorrichtungInduction hob device
1212
Induktionsheizelementinduction heating
1414
DetektionsschaltkreisDetection circuit
1616
HeizfrequenzeinheitHeizfrequenzeinheit
1818
Verbindungconnection
2020
Schutzeinheitprotection unit
2222
Eingangentrance
2424
Abzweigungdiversion
2626
Kondensatorcapacitor
2828
Steuereinheitcontrol unit
3030
InduktionskochfeldInduction hob
3232
Grundkörperbody
3434
Bedieneinheitoperating unit
3636
Schaltungseinheitcircuit unit
3838
Gleichrichterrectifier
4040
Phasephase
4242
Pufferkapazitätbuffering capacity
4444
Anschlusspunktconnection point
4646
Anschlusspunktconnection point
4848
Leistungsstrom-VersorgungseinheitDuty power unit
5050
Sensorstrom-VersorgungseinheitSensor power supply unit
5252
Phasephase
5454
Ausgangexit
5656
Resonanzeinheitresonance unit

Claims (10)

  1. Induction hob device with at least one induction heating element (12), which is provided to heat cooking utensils and with at least one detection circuit (14) which is provided to cooperate with the at least one induction heating element (12) to detect cooking utensils, characterised in that the at least one detection circuit (14) is directly connected to the at least one induction heating element (12) irrespective of an operating state.
  2. Induction hob device according to claim 1, characterised by at least one heat frequency unit (16) for supplying the at least one induction heating element (12), wherein the at least one detection circuit (14) diverges from a connection (18) between the at least one heat frequency unit (16) and the at least one induction heating element. (12).
  3. Induction hob device according to one of the preceding claims, characterised by at least one protection unit (20), which is provided at least to protect the at least one detection circuit (14) from external voltages irrespective of an operating state.
  4. Induction hob device according to claims 2 and 3, characterised in that irrespective of an operating state, the at least one protection unit (20) is connected between an input (22) of the at least one detection circuit (14) and a divergence (24) from the connection (18) between the at least one heat frequency unit (16) and the at least one induction heating element (12).
  5. Induction hob device at least according to claim 3, characterised in that the at least one protection unit (20) has at least one capacitor (26).
  6. Induction hob device according to one of the preceding claims, characterised in that the at least one detection circuit (14) and the at least one induction heating element (12) form an oscillating circuit at least in one operating state.
  7. Induction hob device according to one of the preceding claims, characterised by a control unit (28), which is provided to determine at least one cooking utensil parameter as a function of a natural frequency change of the at least one detection circuit (14).
  8. Induction hob device according to one of the preceding claims, characterised in that the at least one detection circuit (14) is provided to detect cooking utensils outside of a heating operating state.
  9. Induction hob having at least one induction hob device (10) according to one of claims 1 to 8.
  10. Method for operating an induction hob device (10), in particular according to one of claims 1 to 8, having at least one induction heating element (12) and at least one detection circuit (14), which is directly connected to the at least one induction heating element (12) irrespective of an operating state, wherein positioned cooking utensils are detected when the at least one detection circuit (14) cooperates with the at least one induction heating element (12) .
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ES201331611A ES2535245B1 (en) 2013-11-05 2013-11-05 Induction cooking field device
PCT/IB2014/065630 WO2015068077A1 (en) 2013-11-05 2014-10-27 Induction hob device

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KR102069581B1 (en) * 2017-06-26 2020-01-23 엘지전자 주식회사 Induction heating apparatus and method for controlling the same
CN109458638B (en) * 2018-08-17 2020-09-08 浙江绍兴苏泊尔生活电器有限公司 Electromagnetic oven power control method and electromagnetic oven
US20220191977A1 (en) * 2019-05-10 2022-06-16 BSH Hausgeräte GmbH Cooking appliance
CN112393280A (en) * 2019-08-19 2021-02-23 广东美的白色家电技术创新中心有限公司 Electromagnetic cooking bench and control method thereof

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EP3066888A1 (en) 2016-09-14
ES2535245B1 (en) 2016-02-16
WO2015068077A1 (en) 2015-05-14
US10694589B2 (en) 2020-06-23
ES2747917T3 (en) 2020-03-12
ES2535245A1 (en) 2015-05-07
US20160262213A1 (en) 2016-09-08

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