EP2786637B1 - Induction heating apparatus - Google Patents

Induction heating apparatus Download PDF

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Publication number
EP2786637B1
EP2786637B1 EP12815785.6A EP12815785A EP2786637B1 EP 2786637 B1 EP2786637 B1 EP 2786637B1 EP 12815785 A EP12815785 A EP 12815785A EP 2786637 B1 EP2786637 B1 EP 2786637B1
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EP
European Patent Office
Prior art keywords
induction heating
unit
heating
induction
strands
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EP12815785.6A
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German (de)
French (fr)
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EP2786637A2 (en
Inventor
Sandra Aranda Vazquez
Carlos CALVO MESTRE
Pablo Jesus HERNANDEZ BLASO
Gil LLORENTE
Maria Elena Moya Albertin
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2786637A2 publication Critical patent/EP2786637A2/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—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
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
    • H05B6/1272—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements with more than one coil or coil segment per heating zone

Definitions

  • the invention is based on an induction heating device according to the preamble of claim 1.
  • Induction heating devices which have an induction heating unit formed by one or more concentrically arranged induction coils.
  • an induction heating device with two induction coils is known, which can each be supplied by different heating frequency units. These two induction coils are arranged adjacent to each other.
  • the object of the invention is in particular to provide a generic device with improved properties in terms of miniaturization.
  • the object is achieved according to the invention by the features of patent claim 1, while advantageous configurations and developments of the invention can be found in the dependent claims.
  • the invention is based on an induction heating device, in particular an induction hob device, with at least one induction heating unit which has at least two induction heating lines which are intended to be supplied by different heating frequency units.
  • induction heating lines are arranged next to each other.
  • an “induction heating unit” is to be understood as meaning a heating unit which is intended to heat, through induction effects, the induction of electric current and/or magnetic reversal effects, in a preferably ferromagnetic, in particular metallic, heating means, in particular in a cooking utensil, in an oven wall and/or in a radiator arranged in an oven to cause heating of the heating medium.
  • the induction heating unit is provided to, in at least one operating mode in which the induction heating unit is connected to supply electronics, a power of to transmit at least 100 W, in particular at least 500 W, advantageously at least 1000 W, preferably at least 2000 W, in particular to convert electrical energy into electromagnetic field energy, which is ultimately converted into heat in a suitable heating means.
  • an “induction heating line” is to be understood as meaning an electrical line which is intended to carry an electric current which is intended to produce induction effects in a suitable heating medium.
  • the induction heating line is preferably designed as an inductor, in particular as a coil, advantageously as a flat coil, preferably at least essentially in the form of a circular disc, alternatively in the form of an oval or a rectangle.
  • the induction heating line in particular with a coupled heating means, has an inductance of at least 0.1 ⁇ T, in particular at least 0.3 ⁇ T, advantageously at least 1 ⁇ T.
  • the induction heating line in particular without a coupled heating means, has an inductance of at most 100 mT, in particular at most 10 mT, advantageously at most 1 mT.
  • the induction heating line is preferably provided for this purpose, at least in an operating state of high-frequency alternating current, in particular alternating current with a frequency of at least 1 kHz, in particular at least 3 kHz, advantageously at least 10 kHz, preferably at least 20 kHz, in particular at most 100 kHz, in particular with a current intensity of at least 0.5 A, in particular at least 1 A, advantageously at least 3 A, preferably at least 7 A, to be flown through.
  • heating frequency unit is to be understood in particular as an electrical unit that generates an oscillating electrical signal, preferably with a frequency of at least 1 kHz, in particular at least 10 kHz, advantageously at least 20 kHz and in particular at most 100 kHz for an induction heating unit.
  • the heating frequency unit is intended to provide a maximum electrical power of at least 1000 W, in particular at least 2000 W, advantageously at least 3000 W and preferably at least 3500 W, required by the induction heating unit.
  • the heating frequency unit comprises in particular at least one inverter, which preferably has at least two, preferably series-connected, bidirectional unipolar switches, which are formed in particular by a transistor and a diode connected in parallel, and particularly advantageously at least one damping capacitance each connected in parallel with the bidirectional unipolar switches, in particular by at least one capacitor is formed, has.
  • a high-frequency power supply for the induction heating unit can thereby be provided.
  • the heating frequency units are preferably intended to generate currents which have at least essentially the same phase and/or at least essentially the same frequency.
  • each of the values is at most 100%, in particular at most 20%, advantageously at most 5%, particularly advantageously at most 1%, preferably at most 0.3% different to others.
  • the polarity of the induction heating conductors is preferably connected to the heating frequency units in such a way that magnetic fields generated by the induction heating lines are constructively superimposed.
  • two induction heating cables are arranged "next to each other" should be understood in particular to mean that at least 30%, in particular at least 50%, advantageously at least 70%, preferably at least 90%, of the longitudinal parts of each of the induction heating cables are a maximum of 30 mm, in particular a maximum of 10 mm, are advantageously at most 5 mm, preferably at most 2 mm, from any longitudinal portion of the other induction heating cable.
  • the induction heating lines are routed at least essentially in parallel.
  • a longitudinal portion of a first of the induction heating lines and a longitudinal portion of the other induction heating line, which is closest to the longitudinal portion of the first of the induction heating lines have an angular position relative to one another that deviates from 0° by a maximum of 20°, in particular a maximum of 10°, advantageously a maximum of 5° .
  • the induction heating lines are designed as spirals guided one inside the other.
  • the induction heating lines are arranged one above the other. In particular, space can be saved with regard to configurations with concentric, separate induction heating lines.
  • the different heating frequency units are intended to be connected to different phases of a multi-phase power connection.
  • connection to a phase should in particular be understood that the heating frequency unit is wired so that it can draw power from the phase.
  • a high overall performance can be achieved.
  • the at least two induction heating lines are each formed by strands of a single stranded line.
  • the induction heating cables differ from two parallel stranded cables.
  • a "stranded line” is to be understood as meaning an electrical line formed by a large number, in particular at least 4, advantageously at least 8, particularly advantageously at least 16, preferably at least 32, individual wires, so-called strands.
  • the strands of the stranded line are electrically insulated from one another.
  • insulation of the stranded wires is provided to reliably shield a voltage of at least 500 V, in particular at least 1000 V, advantageously at least 2000 V, preferably at least 4000 V.
  • the strands of the stranded line are preferably sheathed in a common electrical insulation.
  • the strands of the stranded line are preferably twisted together, in particular braided.
  • Stranded wires of an induction heating line are preferably electrically connected to one another at their ends and are therefore connected in parallel to one another.
  • the induction heating lines differ from two parallel stranded lines, in particular twisted together.
  • the at least two induction heating lines have essentially the same number of strands, as a result of which essentially the same load capacity of the different induction heating lines can be achieved.
  • Two “essentially the same” numbers should be understood to mean, in particular, whole numbers which differ by a maximum of 10, in particular a maximum of 5, advantageously a maximum of 3, preferably a maximum of 1.
  • the proximity effect and/or the skin effect can be counteracted.
  • an efficient induction heating line suitable for high-frequency use can be achieved.
  • an inexpensive design can be achieved since only one electrical line has to be formed to form an inductor.
  • the strands that are intended to form different induction heating lines are colored differently.
  • insulation of the strands is colored.
  • the stranded wires are insulated by an insulating varnish.
  • the thickness of an insulation of the stranded wires is at most 100 ⁇ m, in particular at most 50 ⁇ m, advantageously at most 30 ⁇ m, preferably at most 20 ⁇ m.
  • simple assembly and/or production can be achieved.
  • a faulty connection of the strands can be prevented.
  • the induction heating device has a control unit which is intended to assign the at least two induction heating lines to a single heating frequency unit or to at least two different heating frequency units.
  • a "control unit” is to be understood in particular as a unit which has at least one control unit.
  • a “control unit” is to be understood in particular as an electronic unit which is preferably at least partially integrated in a control and/or regulation unit of an induction heating device and which is preferably provided for controlling and/or regulating at least the heating frequency units.
  • the control unit comprises an arithmetic unit and, in particular, in addition to the arithmetic unit, a memory unit with a control and/or regulation program stored therein, which is intended to be executed by the arithmetic unit.
  • the control unit has at least one switching arrangement with at least one switching element, in particular an electromechanical switching element, advantageously a relay, which is intended to assign at least one of the induction heating cables to different heating frequency units.
  • the at least one switching element is preferably designed as an at least one-pole, advantageously two-pole, changeover switch.
  • the switching element is provided to only establish or disconnect a connection between one of the induction heating lines and a heating frequency unit.
  • the control unit is intended to allocate the induction heating lines depending on the power required for the induction heating unit, either to one heating frequency unit or to several heating frequency units operated by the same phase, or to different heating frequency units or heating frequency units operated by different phases.
  • control unit provided, in the case of very high power requirements, to operate the induction heating cables from different phases.
  • a load on the induction heating lines can be reduced, particularly in the case of low to high outputs.
  • a high degree of flexibility can be achieved.
  • the induction heating unit has a diameter that is less than 28 cm, in particular less than 25 cm, advantageously less than 23 cm, preferably less than 22 cm.
  • a “diameter” of the induction heating unit is to be understood in particular as meaning a diameter of the inductances formed by the induction heating conductors.
  • a diameter of the induction heating cable corresponds to a diameter of the largest turn of the induction heating cable.
  • the induction heating lines are provided to jointly convert a power of at least 3700 W, in particular at least 4000 W, advantageously at least 4300 W.
  • a maximum power that can be implemented jointly by the induction heating lines is more than a maximum power that may be drawn from a single phase of a multi-phase house power connection.
  • the food to be cooked and/or heating means can be heated quickly.
  • FIG 1 shows a domestic appliance 10 designed as an induction hob.
  • the domestic appliance 10 has an induction heating device 12 designed as an induction hob device.
  • the induction heating device 12 has five induction heating units 20,22,24,26,28.
  • the induction heating units 26, 28 are concentric.
  • the induction heating unit 20 has a diameter 14 of 21 cm.
  • the induction heating units 22, 24 have a diameter of 24 cm.
  • the induction heating unit 20 has two induction heating lines 32, 34 which are intended to be supplied by a first heating frequency unit 42 and a second heating frequency unit 44 ( figures 2 and 3 ).
  • the induction heating lines 32, 34 are arranged together.
  • the induction heating lines 32, 34 are formed by a stranded line 30 with 38 strands.
  • the induction heating lines 32, 34 are each formed by nineteen strands of the stranded line 30.
  • the strands intended to form different induction heating lines 32, 34 are colored differently.
  • the strands have a diameter of 0.2 mm.
  • the strands of the first induction heating line 32 are colored blue, while the strands of the second induction heating line 34 are colored red.
  • the strands of the stranded line 30 are insulated from one another with a protective lacquer which has a thickness of 10 ⁇ m and is intended to enclose a maximum voltage of 2200 V.
  • the strands of the respective induction heating lines 32, 34 are electrically connected to one another at their corresponding ends and form contacts 52, 53, 54, 55. Contrary to the schematic representation, in which the induction heating lines 32, 34 are routed in parallel, the strands of the different induction heating lines 32 , 34 twisted and braided together.
  • the contacts 52, 54 and 53, 55 are electrically isolated from one another.
  • the contacts 52, 53 and 54, 55 are conductively connected to one another via the respective induction heating cable 32, 34.
  • the induction heating lines 32, 34 are provided to implement a power of 4400 W when this is requested by an operator via an operating unit of the domestic appliance 10.
  • the induction heating device 12 has electronic assemblies 62, 64.
  • the electronic assemblies 62, 64 have the heating frequency units 42, 44.
  • the electronic assemblies 62, 64 have rectifier components.
  • the different heating frequency units 42, 44 are connected via the respective electronic assemblies 62, 64 to different phases 43, 45 of a multi-phase power connection.
  • the induction heating device 12 has a control unit 70 which has a control unit 72 and a switching arrangement 74 .
  • the control unit 70 is intended to assign the two induction heating lines 32 , 34 to the first heating frequency unit 42 individually or to assign them to different heating frequency units 42 , 44 .
  • the switching arrangement 74 has a switching element 75 designed as a two-pole changeover switch.
  • the switching element 75 is designed as a relay. What is not shown in detail here is that the electronics assembly 64 is intended to be connected to the induction heating unit 22 when it is in operation. If the induction heating unit 22 is not in operation and a heating power is required for the induction heating unit 20 that is greater than a heating power that can be supplied by a single phase 43, 45, the control unit 70 is provided to switch the switching arrangement 74 in such a way that the induction heating line 34 is connected to the electronics assembly 64 and thus to the heating frequency unit 44 .
  • the control unit 72 is intended to operate the heating frequency units 42, 44 with the same parameters, ie the same frequency, the same phase angle, the same dead times, etc.
  • the control unit 72 is provided to assign the induction heating line 34 to the heating frequency unit 44 in order to reduce the load on the first heating frequency unit 42 . If power is requested for the induction heating unit 20 below the maximum power that can be supplied by a phase 43, 45 and the induction heating unit 22 is in operation, the control unit 70 is intended to assign the induction heating line 34 to the first heating frequency unit 42 in order to reduce the load on the induction heating line 32 .
  • the heating frequency units 42, 44 each have an inverter.
  • the induction heating lines 32, 34 are connected to the heating frequency units 42, 44 in a half-bridge circuit.
  • the electronics assembly 64 is provided solely as a reserve for the induction heating unit 20 and at least one separate electronics assembly is provided for the induction heating unit 22 .
  • the induction heating unit 22 is also formed by two induction heating conductors are arranged next to one another, and the induction heating device 12 has a further electronics assembly with a heating frequency unit, which is intended to supply at least one of the induction heating lines, and that the control unit 70 is intended to assign the electronics assembly 64 to the induction heating unit 22 or the induction heating unit 20 if required. This can be scaled as desired within the limits customary in household appliances.
  • a stranded cable 30 the strands of which have two different colors, is inserted into a spiral-like groove in a carrier (not shown) and glued to the carrier.
  • the ends of the stranded wire 30 are split open and the strands are sorted according to their colors. Wires that belong together are mechanically and electrically connected to one another to form contacts 52, 53, 54, 55 using a contact clamp.
  • the strands are assigned to the different induction heating lines 32, 34 after an electrical contact between the ends of the stranded wire 30 has been checked.
  • a heating frequency unit has more than two, in particular three, different induction heating lines that are arranged next to one another.
  • induction heating units according to the invention with even smaller diameters, for example 18 cm or 15 cm.

Description

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

Es sind Induktionsheizvorrichtungen bekannt, die eine Induktionsheizeinheit aufweisen, die von einer oder mehreren konzentrisch angeordneten Induktionsspulen gebildet sind.Induction heating devices are known which have an induction heating unit formed by one or more concentrically arranged induction coils.

Aus EP 1 931 177 A1 ist eine Induktionsheizvorrichtung mit zwei Induktionsspulen bekannt, welche jeweils von unterschiedlichen Heizfrequenzeinheiten versorgt werden können. Diese zwei Induktionsspulen sind zueinander benachbart angeordnet.Out of EP 1 931 177 A1 an induction heating device with two induction coils is known, which can each be supplied by different heating frequency units. These two induction coils are arranged adjacent to each other.

Die Aufgabe der Erfindung besteht insbesondere darin, eine gattungsgemäße Vorrichtung mit verbesserten Eigenschaften hinsichtlich einer Miniaturisierbarkeit 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 improved properties in terms of miniaturization. The object is achieved according to the invention by the features of patent claim 1, while advantageous configurations and developments of the invention can be found in the dependent claims.

Die Erfindung geht aus von einer Induktionsheizvorrichtung, insbesondere einer Induktionskochfeldvorrichtung, mit zumindest einer Induktionsheizeinheit, die zumindest zwei Induktionsheizleitungen aufweist, die dazu vorgesehen sind, von unterschiedlichen Heizfrequenzeinheiten versorgt zu werden.The invention is based on an induction heating device, in particular an induction hob device, with at least one induction heating unit which has at least two induction heating lines which are intended to be supplied by different heating frequency units.

Es wird vorgeschlagen, dass die Induktionsheizleitungen beieinander angeordnet sind.It is suggested that the induction heating lines are arranged next to each other.

Unter einer "Induktionsheizeinheit" soll eine Heizeinheit verstanden werden, die dazu vorgesehen ist, durch Induktionseffekte, Induzierung von elektrischem Strom und/oder Ummagnetisierungseffekten, in einem, vorzugsweise ferromagnetischen, insbesondere metallischen, Heizmittel, insbesondere in einem Gargeschirr, in einer Backofenwand und/oder in einem Heizkörper, der in einem Backofen angeordnet ist, eine Erwärmung des Heizmittels zu verursachen. Insbesondere ist die Induktionsheizeinheit dazu vorgesehen, in zumindest einem Betriebsmodus, in dem die Induktionsheizeinheit an eine Versorgungselektronik angeschlossen ist, eine Leistung von zumindest 100 W, insbesondere zumindest 500 W, vorteilhaft zumindest 1000 W, vorzugsweise zumindest 2000 W, zu übertragen, insbesondere elektrische Energie in elektromagnetische Feldenergie zu wandeln, die in einem geeigneten Heizmittel letztendlich in Wärme gewandelt wird. Unter einer "Induktionsheizleitung" soll eine elektrische Leitung verstanden werden, die dazu vorgesehen ist, einen elektrischen Strom zu führen, der dazu vorgesehen ist, in einem geeigneten Heizmittel Induktionseffekte hervorzurufen. Vorzugsweise ist die Induktionsheizleitung als Induktivität, insbesondere als Spule, vorteilhaft als Flachspule, vorzugsweise zumindest im Wesentlichen in Form einer Kreisscheibe, alternativ in Form eines Ovals oder eines Rechtecks, ausgebildet. Insbesondere weist die Induktionsheizleitung, insbesondere mit einem gekoppelten Heizmittel, eine Induktivität von zumindest 0,1 µT, insbesondere zumindest 0,3 µT, vorteilhaft zumindest 1 µT, auf. Insbesondere weist die Induktionsheizleitung, insbesondere ohne ein gekoppeltes Heizmittel, eine Induktivität von maximal 100 mT, insbesondere maximal 10 mT, vorteilhaft maximal 1 mT, auf. Vorzugsweise ist die Induktionsheizleitung dazu vorgesehen, zumindest in einem Betriebszustand von hochfrequentem Wechselstrom, insbesondere einem Wechselstrom mit einer Frequenz von zumindest 1 kHz, insbesondere zumindest 3 kHz, vorteilhaft zumindest 10 kHz, vorzugsweise zumindest 20 kHz, insbesondere maximal 100 kHz, insbesondere mit einer Stromstärke von zumindest 0,5 A, insbesondere zumindest 1 A, vorteilhaft zumindest 3 A, vorzugsweise zumindest 7 A, durchflossen zu werden. Unter "vorgesehen" soll insbesondere speziell programmiert, ausgelegt und/oder ausgestattet verstanden werden. 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 eine Induktionsheizeinheit erzeugt. Insbesondere ist die Heizfrequenzeinheit dazu vorgesehen, eine, von der Induktionsheizeinheit geforderte, maximale elektrische Leistung von zumindest 1000 W, insbesondere zumindest 2000 W, vorteilhaft zumindest 3000 W und vorzugsweise zumindest 3500 W bereitzustellen. Die Heizfrequenzeinheit umfasst insbesondere 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 Dämpfungskapazität, die insbesondere von zumindest einem Kondensator gebildet ist, aufweist. Hierdurch kann eine hochfrequente Energieversorgung der Induktionsheizeinheit bereitgestellt werden. Vorzugsweise sind in einem Betriebszustand, in dem die Induktionsheizleitungen mit unterschiedlichen Heizfrequenzeinheiten betrieben werden, die Heizfrequenzeinheiten dazu vorgesehen, Ströme zu erzeugen, die eine zumindest im Wesentlichen gleiche Phase und/oder eine zumindest im Wesentlichen gleiche Frequenz haben. Darunter, dass zwei Werte zumindest "im Wesentlichen gleich" sind, soll insbesondere verstanden werden, das jeder der Werte maximal 100 %, insbesondere maximal 20 %, vorteilhaft maximal 5 %, besonders vorteilhaft maximal 1 %, vorzugsweise maximal 0,3 %, vom anderen abweicht. Vorzugsweise sind die Induktionsheizleiter in ihrer Polarität derart an die Heizfrequenzeinheiten angeschlossen, dass sich durch die Induktionsheizleitungen erzeugte Magnetfelder konstruktiv überlagern. Darunter, dass zwei Induktionsheizleitungen "beieinander" angeordnet sind, soll insbesondere verstanden werden, dass zumindest 30 %, insbesondere zumindest 50 %, vorteilhaft zumindest 70 %, vorzugsweise zumindest 90 %, der Längsanteile jeder der Induktionsheizleitungen maximal 30 mm, insbesondere maximal 10 mm, vorteilhaft maximal 5 mm, vorzugsweise maximal 2 mm von einem beliebigen Längsanteil der jeweils anderen Induktionsheizleitung entfernt sind. Insbesondere sind die Induktionsheizleitungen zumindest im Wesentlichen parallel geführt. Insbesondere weisen ein Längsanteil einer ersten der Induktionsheizleitungen und ein Längsanteil der anderen Induktionsheizleitung, der dem Längsanteil der ersten der Induktionsheizleitungen am nächsten ist, eine Winkellage zueinander auf, die maximal 20°, insbesondere maximal 10°, vorteilhaft maximal 5°, von 0° abweicht. Insbesondere sind die Induktionsheizleitungen als ineinander geführte Spiralen ausgebildet. Alternativ ist es denkbar, dass die Induktionsheizleitungen übereinander angeordnet sind. Es kann insbesondere eine Platzersparnis erreicht werden bezüglich Ausgestaltungen mit konzentrischen, separaten Induktionsheizleitungen. Es kann insbesondere erreicht werden, dass eine ausreichende Anzahl an Windungen Platz findet, um eine für einen Betrieb nötige Induktivität der Induktionsheizleitung zu erreichen. Insbesondere kann auch für kleine Heizmittel, insbesondere Gargeschirre, ein hoher Leistungseintrag erreicht werden.An "induction heating unit" is to be understood as meaning a heating unit which is intended to heat, through induction effects, the induction of electric current and/or magnetic reversal effects, in a preferably ferromagnetic, in particular metallic, heating means, in particular in a cooking utensil, in an oven wall and/or in a radiator arranged in an oven to cause heating of the heating medium. In particular, the induction heating unit is provided to, in at least one operating mode in which the induction heating unit is connected to supply electronics, a power of to transmit at least 100 W, in particular at least 500 W, advantageously at least 1000 W, preferably at least 2000 W, in particular to convert electrical energy into electromagnetic field energy, which is ultimately converted into heat in a suitable heating means. An "induction heating line" is to be understood as meaning an electrical line which is intended to carry an electric current which is intended to produce induction effects in a suitable heating medium. The induction heating line is preferably designed as an inductor, in particular as a coil, advantageously as a flat coil, preferably at least essentially in the form of a circular disc, alternatively in the form of an oval or a rectangle. In particular, the induction heating line, in particular with a coupled heating means, has an inductance of at least 0.1 μT, in particular at least 0.3 μT, advantageously at least 1 μT. In particular, the induction heating line, in particular without a coupled heating means, has an inductance of at most 100 mT, in particular at most 10 mT, advantageously at most 1 mT. The induction heating line is preferably provided for this purpose, at least in an operating state of high-frequency alternating current, in particular alternating current with a frequency of at least 1 kHz, in particular at least 3 kHz, advantageously at least 10 kHz, preferably at least 20 kHz, in particular at most 100 kHz, in particular with a current intensity of at least 0.5 A, in particular at least 1 A, advantageously at least 3 A, preferably at least 7 A, to be flown through. “Provided” should be understood to mean, in particular, specially programmed, designed and/or equipped. A “heating frequency unit” is to be understood in particular as an electrical unit that generates an oscillating electrical signal, preferably with a frequency of at least 1 kHz, in particular at least 10 kHz, advantageously at least 20 kHz and in particular at most 100 kHz for an induction heating unit. In particular, the heating frequency unit is intended to provide a maximum electrical power of at least 1000 W, in particular at least 2000 W, advantageously at least 3000 W and preferably at least 3500 W, required by the induction heating unit. The heating frequency unit comprises in particular at least one inverter, which preferably has at least two, preferably series-connected, bidirectional unipolar switches, which are formed in particular by a transistor and a diode connected in parallel, and particularly advantageously at least one damping capacitance each connected in parallel with the bidirectional unipolar switches, in particular by at least one capacitor is formed, has. A high-frequency power supply for the induction heating unit can thereby be provided. In an operating state in which the induction heating lines are operated with different heating frequency units, the heating frequency units are preferably intended to generate currents which have at least essentially the same phase and/or at least essentially the same frequency. The fact that two values are at least “substantially the same” is to be understood in particular as meaning that each of the values is at most 100%, in particular at most 20%, advantageously at most 5%, particularly advantageously at most 1%, preferably at most 0.3% different to others. The polarity of the induction heating conductors is preferably connected to the heating frequency units in such a way that magnetic fields generated by the induction heating lines are constructively superimposed. The fact that two induction heating cables are arranged "next to each other" should be understood in particular to mean that at least 30%, in particular at least 50%, advantageously at least 70%, preferably at least 90%, of the longitudinal parts of each of the induction heating cables are a maximum of 30 mm, in particular a maximum of 10 mm, are advantageously at most 5 mm, preferably at most 2 mm, from any longitudinal portion of the other induction heating cable. In particular, the induction heating lines are routed at least essentially in parallel. In particular, a longitudinal portion of a first of the induction heating lines and a longitudinal portion of the other induction heating line, which is closest to the longitudinal portion of the first of the induction heating lines, have an angular position relative to one another that deviates from 0° by a maximum of 20°, in particular a maximum of 10°, advantageously a maximum of 5° . In particular, the induction heating lines are designed as spirals guided one inside the other. Alternatively, it is conceivable that the induction heating lines are arranged one above the other. In particular, space can be saved with regard to configurations with concentric, separate induction heating lines. In particular, it can be achieved that there is room for a sufficient number of windings in order to achieve an inductance of the induction heating line that is necessary for operation. In particular, a high power input can also be achieved for small heating means, in particular cooking utensils.

Weiterhin wird vorgeschlagen, dass die unterschiedlichen Heizfrequenzeinheiten dazu vorgesehen sind, an unterschiedliche Phasen eines Mehrphasenstromanschlusses angebunden zu werden. Unter einer "Anbindung" an eine Phase soll insbesondere verstanden werden, dass die Heizfrequenzeinheit so beschaltet ist, dass sie Leistung von der Phase beziehen kann. Es kann insbesondere eine hohe Gesamtleistung erreicht werden.Furthermore, it is proposed that the different heating frequency units are intended to be connected to different phases of a multi-phase power connection. Under a "connection" to a phase should in particular be understood that the heating frequency unit is wired so that it can draw power from the phase. In particular, a high overall performance can be achieved.

Erfindungsgemäß sind die zumindest zwei Induktionsheizleitungen jeweils von Litzen einer einzelnen Litzenleitung gebildet. Insbesondere unterscheiden sich die Induktionsheizleitungen von zwei parallel geführten Litzenleitungen. Unter einer "Litzenleitung" soll eine elektrische Leitung verstanden werden, die von einer Vielzahl, insbesondere zumindest 4, vorteilhaft zumindest 8, besonders vorteilhaft zumindest 16, vorzugsweise zumindest 32, einzelnen Drähten, sogenannten Litzen, gebildet sind. Erfindungsgemäß sind die Litzen der Litzenleitung gegeneinander elektrisch isoliert. Insbesondere ist eine Isolation der Litzen dazu vorgesehen eine Spannung von zumindest 500 V, insbesondere zumindest 1000 V, vorteilhaft zumindest 2000 V, vorzugsweise zumindest 4000 V, sicher abzuschirmen. Vorzugsweise sind die Litzen der Litzenleitung von einer gemeinsamen elektrischen Isolation ummantelt. Vorzugsweise sind die Litzen der Litzenleitung miteinander verdrillt, insbesondere verflochten. Vorzugsweise sind Litzen einer Induktionsheizleitung an ihren Enden miteinander elektrisch verbunden und damit einander parallel geschaltet. Insbesondere unterscheiden sich die Induktionsheizleitungen von zwei parallel geführten, insbesondere miteinander verdrillten, Litzenleitungen. Insbesondere weisen die zumindest zwei Induktionsheizleitungen eine im Wesentlichen gleiche Anzahl von Litzen auf, wodurch eine im Wesentlichen gleiche Belastbarkeit der unterschiedlichen Induktionsheizleitungen erreicht werden kann. Unter zwei "im Wesentlichen gleichen" Anzahlen sollen insbesondere ganze Zahlen verstanden werden, die sich um maximal 10, insbesondere maximal 5, vorteilhaft maximal 3, vorzugsweise maximal 1, unterscheiden. Insbesondere kann dem Proximity-Effekt und/oder dem Skin-Effekt entgegengewirkt werden. Es kann insbesondere eine effiziente, für Hochfrequenzanwendung geeignete Induktionsheizleitung erreicht werden. Insbesondere kann eine preiswerte Ausgestaltung erfolgen, da lediglich eine elektrische Leitung zu einer Induktivität ausgebildet werden muss. Insbesondere kann auf eine Umgestaltung zusätzlicher Bauteile, insbesondere eines Spulenträgers, oder einer Umgestaltung von Herstellungsprozessen, insbesondere des Windungsprozesses, im Vergleich zu herkömmlichen Induktionsheizvorrichtungen verzichtet werden.According to the invention, the at least two induction heating lines are each formed by strands of a single stranded line. In particular, the induction heating cables differ from two parallel stranded cables. A "stranded line" is to be understood as meaning an electrical line formed by a large number, in particular at least 4, advantageously at least 8, particularly advantageously at least 16, preferably at least 32, individual wires, so-called strands. According to the invention, the strands of the stranded line are electrically insulated from one another. In particular, insulation of the stranded wires is provided to reliably shield a voltage of at least 500 V, in particular at least 1000 V, advantageously at least 2000 V, preferably at least 4000 V. The strands of the stranded line are preferably sheathed in a common electrical insulation. The strands of the stranded line are preferably twisted together, in particular braided. Stranded wires of an induction heating line are preferably electrically connected to one another at their ends and are therefore connected in parallel to one another. In particular, the induction heating lines differ from two parallel stranded lines, in particular twisted together. In particular, the at least two induction heating lines have essentially the same number of strands, as a result of which essentially the same load capacity of the different induction heating lines can be achieved. Two “essentially the same” numbers should be understood to mean, in particular, whole numbers which differ by a maximum of 10, in particular a maximum of 5, advantageously a maximum of 3, preferably a maximum of 1. In particular, the proximity effect and/or the skin effect can be counteracted. In particular, an efficient induction heating line suitable for high-frequency use can be achieved. In particular, an inexpensive design can be achieved since only one electrical line has to be formed to form an inductor. In particular, there is no need to redesign additional components, in particular a coil carrier, or to redesign manufacturing processes, in particular the winding process, compared to conventional induction heating devices.

Weiterhin wird vorgeschlagen, dass die Litzen, die dazu vorgesehen sind, unterschiedliche Induktionsheizleitungen zu bilden, unterschiedlich gefärbt sind. Insbesondere ist eine Isolierung der Litzen eingefärbt. Insbesondere ist eine Isolierung der Litzen von einem Isolierlack gebildet. Insbesondere beträgt eine Dicke einer Isolierung der Litzen maximal 100 µm, insbesondere maximal 50 µm, vorteilhaft maximal 30 µm, vorzugsweise maximal 20 µm. Insbesondere kann eine einfache Montage und/oder Produktion erreicht werden. Insbesondere kann einer fehlerhaften Verbindung der Litzen vorgebeugt werden.Furthermore, it is proposed that the strands that are intended to form different induction heating lines are colored differently. In particular, insulation of the strands is colored. In particular, the stranded wires are insulated by an insulating varnish. In particular, the thickness of an insulation of the stranded wires is at most 100 μm, in particular at most 50 μm, advantageously at most 30 μm, preferably at most 20 μm. In particular, simple assembly and/or production can be achieved. In particular, a faulty connection of the strands can be prevented.

Vorteilhaft wird vorgeschlagen, dass die Induktionsheizvorrichtung eine Kontrolleinheit aufweist, die dazu vorgesehen ist, die zumindest zwei Induktionsheizleitungen einer einzelnen oder zumindest zwei unterschiedlichen Heizfrequenzeinheiten zuzuordnen. Unter einer "Kontrolleinheit" soll insbesondere eine Einheit verstanden werden, die zumindest eine Steuereinheit aufweist. Unter einer "Steuereinheit" soll insbesondere eine elektronische Einheit verstanden werden, die vorzugsweise in einer Steuer- und/oder Regeleinheit einer Induktionsheizvorrichtung zumindest teilweise integriert ist und die vorzugsweise dazu vorgesehen ist, zumindest die Heizfrequenzeinheiten 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. Erfindungsgemäß weist die Kontrolleinheit zumindest eine Schaltanordnung mit zumindest einem Schaltelement, insbesondere einem elektromechanischen Schaltelement, vorteilhaft einem Relais, auf, dass dazu vorgesehen ist, zumindest eine der Induktionsheizleitungen unterschiedlichen Heizfrequenzeinheiten zuzuordnen. Vorzugsweise ist das zumindest eine Schaltelement als zumindest einpoliger, vorteilhaft zweipoliger, Umschalter ausgebildet. Alternativ ist es denkbar, dass das Schaltelement dazu vorgesehen ist, lediglich eine Verbindung zwischen einer der Induktionsheizleitungen und einer Heizfrequenzeinheit herzustellen oder zu trennen. Insbesondere ist die Kontrolleinheit dazu vorgesehen, die Induktionsheizleitungen in Abhängigkeit von einer für die Induktionsheizeinheit angeforderten Leistung, entweder einer Heizfrequenzeinheit, bzw. mehreren von einer gleichen Phase betriebenen Heizfrequenzeinheiten, oder unterschiedlichen Heizfrequenzeinheiten, bzw. von unterschiedlichen Phasen betriebenen Heizfrequenzeinheiten, zuzuordnen. Insbesondere ist die Kontrolleinheit dazu vorgesehen, im Falle sehr hoher angeforderter Leistungen, die Induktionsheizleitungen von unterschiedlichen Phasen zu betreiben. Es kann insbesondere eine Belastung der Induktionsheizleitungen, insbesondere im Fall von niedrigen bis hohen Leistungen, reduziert werden. Es kann insbesondere eine hohe Flexibilität erreicht werden.Advantageously, it is proposed that the induction heating device has a control unit which is intended to assign the at least two induction heating lines to a single heating frequency unit or to at least two different heating frequency units. A "control unit" is to be understood in particular as a unit which has at least one control unit. A "control unit" is to be understood in particular as an electronic unit which is preferably at least partially integrated in a control and/or regulation unit of an induction heating device and which is preferably provided for controlling and/or regulating at least the heating frequency units. Preferably, the control unit comprises an arithmetic unit and, in particular, in addition to the arithmetic unit, a memory unit with a control and/or regulation program stored therein, which is intended to be executed by the arithmetic unit. According to the invention, the control unit has at least one switching arrangement with at least one switching element, in particular an electromechanical switching element, advantageously a relay, which is intended to assign at least one of the induction heating cables to different heating frequency units. The at least one switching element is preferably designed as an at least one-pole, advantageously two-pole, changeover switch. Alternatively, it is conceivable that the switching element is provided to only establish or disconnect a connection between one of the induction heating lines and a heating frequency unit. In particular, the control unit is intended to allocate the induction heating lines depending on the power required for the induction heating unit, either to one heating frequency unit or to several heating frequency units operated by the same phase, or to different heating frequency units or heating frequency units operated by different phases. In particular, the control unit provided, in the case of very high power requirements, to operate the induction heating cables from different phases. In particular, a load on the induction heating lines can be reduced, particularly in the case of low to high outputs. In particular, a high degree of flexibility can be achieved.

Ferner wird vorgeschlagen, dass die Induktionsheizeinheit einen Durchmesser aufweist, der kleiner ist als 28 cm, insbesondere kleiner ist als 25 cm, vorteilhaft kleiner ist als 23 cm, vorzugsweise kleiner ist als 22 cm. Unter einem "Durchmesser" der Induktionsheizeinheit soll insbesondere ein Durchmesser der von den Induktionsheizleitern gebildeten Induktivitäten verstanden werden. Insbesondere entspricht ein Durchmesser der Induktionsheizleitung einem Durchmesser der größten Windung der Induktionsheizleiter. Bei einem erfindungsgemäßen Einsatz in einer derart kleinen Induktionsheizeinheit, in der nicht genügend Platz für zwei separate Induktionsspulen ist, kann ein besonders großer Vorteil erreicht werden.It is also proposed that the induction heating unit has a diameter that is less than 28 cm, in particular less than 25 cm, advantageously less than 23 cm, preferably less than 22 cm. A “diameter” of the induction heating unit is to be understood in particular as meaning a diameter of the inductances formed by the induction heating conductors. In particular, a diameter of the induction heating cable corresponds to a diameter of the largest turn of the induction heating cable. When used according to the invention in such a small induction heating unit, in which there is not enough space for two separate induction coils, a particularly great advantage can be achieved.

Weiterhin wird vorgeschlagen, dass die Induktionsheizleitungen dazu vorgesehen sind, gemeinsam eine Leistung von zumindest 3700 W, insbesondere zumindest 4000 W, vorteilhaft zumindest 4300 W, umzusetzen. Insbesondere beträgt eine maximale Leistung, die gemeinsam von den Induktionsheizleitungen umgesetzt werden kann, mehr als eine Leistung, die maximal von einer einzelnen Phase eines Mehrphasen Hausstromanschlusses bezogen werden darf. Es kann insbesondere eine schnelle Erhitzung von Gargut und/oder Heizmitteln ermöglicht werden.Furthermore, it is proposed that the induction heating lines are provided to jointly convert a power of at least 3700 W, in particular at least 4000 W, advantageously at least 4300 W. In particular, a maximum power that can be implemented jointly by the induction heating lines is more than a maximum power that may be drawn from a single phase of a multi-phase house power connection. In particular, the food to be cooked and/or heating means can be heated quickly.

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel 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 result from the following description of the drawing. In the drawing an embodiment of the invention is 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 further meaningful combinations.

Es zeigen:

Fig. 1
ein erfindungsgemäßes Kochfeld mit einer erfindungsgemäßen Induktionsheizvorrichtung in einer schematischen Ansicht von oben,
Fig. 2
eine erfindungsgemäße Induktionsheizvorrichtung mit einer erfindungsgemäßen Litzenleitung und
Fig. 3
ein Schaltbild einer erfindungsgemäßen Beschaltung.
Show it:
1
a hob according to the invention with an induction heating device according to the invention in a schematic view from above,
2
an induction heating device according to the invention with a stranded wire according to the invention and
3
a circuit diagram of a circuit according to the invention.

Figur 1 zeigt ein als Induktionskochfeld ausgebildetes Hausgerät 10. Das Hausgerät 10 weist eine als Induktionskochfeldvorrichtung ausgebildete Induktionsheizvorrichtung 12 auf. Die Induktionsheizvorrichtung 12 weist fünf Induktionsheizeinheiten 20, 22, 24, 26, 28 auf. Die Induktionsheizeinheiten 26, 28 sind konzentrisch ausgebildet.Die Induktionsheizeinheit 20 weist einen Durchmesser 14 von 21 cm auf. Die Induktionsheizeinheiten 22, 24 weisen einen Durchmesser von 24 cm auf. figure 1 shows a domestic appliance 10 designed as an induction hob. The domestic appliance 10 has an induction heating device 12 designed as an induction hob device. The induction heating device 12 has five induction heating units 20,22,24,26,28. The induction heating units 26, 28 are concentric. The induction heating unit 20 has a diameter 14 of 21 cm. The induction heating units 22, 24 have a diameter of 24 cm.

Die Induktionsheizeinheit 20 weist zwei Induktionsheizleitungen 32, 34 auf, die dazu vorgesehen sind, von einer ersten Heizfrequenzeinheit 42 und einer zweiten Heizfrequenzeinheit 44 versorgt zu werden (Figuren 2 und 3). Die Induktionsheizleitungen 32, 34 sind beieinander angeordnet. Die Induktionsheizleitungen 32, 34 sind von einer Litzenleitung 30 mit 38 Litzen gebildet. Die Induktionsheizleitungen 32, 34 sind jeweils von neunzehn Litzen der Litzenleitung 30 gebildet. Die Litzen, die dazu vorgesehen sind, unterschiedliche Induktionsheizleitungen 32, 34 zu bilden, sind unterschiedlich gefärbt. Die Litzen weisen einen Durchmesser von 0,2 mm auf. Die Litzen der ersten Induktionsheizleitung 32 sind blau gefärbt, während die Litzen der zweiten Induktionsheizleitung 34 rot gefärbt sind. Die Litzen der Litzenleitung 30 sind gegeneinander mit einem Schutzlack isoliert, der eine Dicke von 10 µm aufweist und dazu vorgesehen ist, eine Spannung von maximal 2200 V einzuschließen. Die Litzen der jeweiligen Induktionsheizleitungen 32, 34 sind an ihren korrespondierenden Enden miteinander elektrisch verbunden und bilden Kontakte 52, 53, 54, 55. Entgegen der schematischen Darstellung, in der die Induktionsheizleitungen 32, 34 parallel geführt sind, sind die Litzen der unterschiedlichen Induktionsheizleitungen 32, 34 miteinander verdrillt und verflochten. Die Kontakte 52, 54, bzw. 53, 55 sind gegeneinander elektrisch isoliert. Die Kontakte 52, 53 bzw. 54, 55 sind über die jeweilige Induktionsheizleitung 32, 34 leitend miteinander verbunden. Die Induktionsheizleitungen 32, 34 sind dazu vorgesehen, wenn dies von einem Bediener über eine Bedieneinheit der des Hausgeräts 10 angefordert ist, eine Leistung von 4400 W umzusetzen.The induction heating unit 20 has two induction heating lines 32, 34 which are intended to be supplied by a first heating frequency unit 42 and a second heating frequency unit 44 ( figures 2 and 3 ). The induction heating lines 32, 34 are arranged together. The induction heating lines 32, 34 are formed by a stranded line 30 with 38 strands. The induction heating lines 32, 34 are each formed by nineteen strands of the stranded line 30. The strands intended to form different induction heating lines 32, 34 are colored differently. The strands have a diameter of 0.2 mm. The strands of the first induction heating line 32 are colored blue, while the strands of the second induction heating line 34 are colored red. The strands of the stranded line 30 are insulated from one another with a protective lacquer which has a thickness of 10 μm and is intended to enclose a maximum voltage of 2200 V. The strands of the respective induction heating lines 32, 34 are electrically connected to one another at their corresponding ends and form contacts 52, 53, 54, 55. Contrary to the schematic representation, in which the induction heating lines 32, 34 are routed in parallel, the strands of the different induction heating lines 32 , 34 twisted and braided together. The contacts 52, 54 and 53, 55 are electrically isolated from one another. The contacts 52, 53 and 54, 55 are conductively connected to one another via the respective induction heating cable 32, 34. The induction heating lines 32, 34 are provided to implement a power of 4400 W when this is requested by an operator via an operating unit of the domestic appliance 10.

Die Induktionsheizvorrichtung 12 weist Elektronikbaugruppen 62, 64 auf. Die Elektronikbaugruppen 62, 64 weisen die Heizfrequenzeinheiten 42, 44 auf. Weiterhin weisen die Elektronikbaugruppen 62, 64 Gleichrichterkomponenten auf. Ferner weisen die Elektronikbaugruppen 62, 64 Resonanzanordnungen, die von Kapazitäten gebildet sind, auf, die dazu vorgesehen sind, mit den Induktionsheizleitungen 32, 34 Schwingkreise zu bilden. Die unterschiedlichen Heizfrequenzeinheiten 42, 44 sind über die jeweiligen Elektronikbaugruppen 62, 64 an unterschiedliche Phasen 43, 45 eines Mehrphasenstromanschlusses angebunden. Weiterhin weist die Induktionsheizvorrichtung 12 eine Kontrolleinheit 70, die eine Steuereinheit 72 und eine Schaltanordnung 74 aufweist, auf. Die Kontrolleinheit 70 ist dazu vorgesehen, die zwei Induktionsheizleitungen 32, 34 der ersten Heizfrequenzeinheit 42 einzeln zuzuordnen oder unterschiedlichen Heizfrequenzeinheiten 42, 44 zuzuordnen. Die Schaltanordnung 74 weist ein als zweipoliger Umschalter ausgebildetes Schaltelement 75 auf. Das Schaltelement 75 ist als Relais ausgebildet. Nicht detailliert dargestellt ist hier, dass die Elektronikbaugruppe 64 dazu vorgesehen ist, bei einem Betrieb der Induktionsheizeinheit 22 mit dieser verbunden zu werden. Ist die Induktionsheizeinheit 22 nicht in Betrieb und für die Induktionsheizeinheit 20 ist eine Heizleistung angefordert, die größer ist als eine Heizleistung, die von einer einzelnen Phase 43, 45 geliefert werden kann, ist die Kontrolleinheit 70 dazu vorgesehen, die Schaltanordnung 74 derart zu schalten, dass die Induktionsheizleitung 34 mit der Elektronikbaugruppe 64 und somit mit der Heizfrequenzeinheit 44 verbunden ist. Die Steuereinheit 72 ist dazu vorgesehen, die Heizfrequenzeinheiten 42, 44 mit gleichen Parametern, also gleicher Frequenz, gleicher Phasenlage, gleichen Totzeiten usw., zu betreiben. Ist für die Induktionsheizeinheit 22 keine Heizleistung angefordert, ist die Steuereinheit 72 dazu vorgesehen, die Induktionsheizleitung 34 der Heizfrequenzeinheit 44 zuzuordnen, um eine Belastung der ersten Heizfrequenzeinheit 42 zu verringern. Sind für die Induktionsheizeinheit 20 Leistungen unter der maximal von einer Phase 43, 45 lieferbaren Leistung angefordert und die Induktionsheizeinheit 22 ist in Betrieb, ist die Kontrolleinheit 70 dazu vorgesehen, die Induktionsheizleitung 34 der ersten Heizfrequenzeinheit 42 zuzuordnen, um eine Belastung der Induktionsheizleitung 32 zu verringern.The induction heating device 12 has electronic assemblies 62, 64. The electronic assemblies 62, 64 have the heating frequency units 42, 44. Furthermore, the electronic assemblies 62, 64 have rectifier components. Furthermore, the electronic assemblies 62, 64 resonance arrangements, which are formed by capacitors, on, which are intended to form with the induction heating lines 32, 34 resonant circuits. The different heating frequency units 42, 44 are connected via the respective electronic assemblies 62, 64 to different phases 43, 45 of a multi-phase power connection. Furthermore, the induction heating device 12 has a control unit 70 which has a control unit 72 and a switching arrangement 74 . The control unit 70 is intended to assign the two induction heating lines 32 , 34 to the first heating frequency unit 42 individually or to assign them to different heating frequency units 42 , 44 . The switching arrangement 74 has a switching element 75 designed as a two-pole changeover switch. The switching element 75 is designed as a relay. What is not shown in detail here is that the electronics assembly 64 is intended to be connected to the induction heating unit 22 when it is in operation. If the induction heating unit 22 is not in operation and a heating power is required for the induction heating unit 20 that is greater than a heating power that can be supplied by a single phase 43, 45, the control unit 70 is provided to switch the switching arrangement 74 in such a way that the induction heating line 34 is connected to the electronics assembly 64 and thus to the heating frequency unit 44 . The control unit 72 is intended to operate the heating frequency units 42, 44 with the same parameters, ie the same frequency, the same phase angle, the same dead times, etc. If no heating power is requested for the induction heating unit 22 , the control unit 72 is provided to assign the induction heating line 34 to the heating frequency unit 44 in order to reduce the load on the first heating frequency unit 42 . If power is requested for the induction heating unit 20 below the maximum power that can be supplied by a phase 43, 45 and the induction heating unit 22 is in operation, the control unit 70 is intended to assign the induction heating line 34 to the first heating frequency unit 42 in order to reduce the load on the induction heating line 32 .

Die Heizfrequenzeinheiten 42, 44 weisen jeweils einen Wechselrichter auf. Die Induktionsheizleitungen 32, 34 sind in Halbbrückenschaltung an die Heizfrequenzeinheiten 42, 44 angebunden.The heating frequency units 42, 44 each have an inverter. The induction heating lines 32, 34 are connected to the heating frequency units 42, 44 in a half-bridge circuit.

Weiterhin ist denkbar, dass die Elektronikbaugruppe 64 alleinig als Reserve für die Induktionsheizeinheit 20 vorgesehen ist und für die Induktionsheizeinheit 22 zumindest eine separate Elektronikbaugruppe vorgesehen ist. Weiterhin ist es denkbar, dass die Induktionsheizeinheit 22 ebenso von zwei Induktionsheizleitern gebildet ist, die beieinander angeordnet sind, und die Induktionsheizvorrichtung 12 eine weitere Elektronikbaugruppe mit Heizfrequenzeinheit aufweist, die dazu vorgesehen ist, mindestens eine der Induktionsheizleitungen zu versorgen, und dass die Kontrolleinheit 70 dazu vorgesehen ist, die Elektronikbaugruppe 64 bei Bedarf der Induktionsheizeinheit 22 oder der Induktionsheizeinheit 20 zuzuordnen. Dies kann in hausgeräteüblichem Rahmen beliebig skaliert werden.It is also conceivable that the electronics assembly 64 is provided solely as a reserve for the induction heating unit 20 and at least one separate electronics assembly is provided for the induction heating unit 22 . Furthermore, it is conceivable that the induction heating unit 22 is also formed by two induction heating conductors are arranged next to one another, and the induction heating device 12 has a further electronics assembly with a heating frequency unit, which is intended to supply at least one of the induction heating lines, and that the control unit 70 is intended to assign the electronics assembly 64 to the induction heating unit 22 or the induction heating unit 20 if required. This can be scaled as desired within the limits customary in household appliances.

Bei einer Herstellung der Induktionsheizvorrichtung 12, bzw. der Induktionsheizeinheit 20 wird eine Litzenleitung 30, deren Litzen zwei verschiedene Farben aufweisen, in eine spiralartige Nut in einem Träger (nicht weiter dargestellt) eingelegt und mit dem Träger verklebt. Die Enden der Litzenleitung 30 werden aufgesplissen und die Litzen entsprechend ihren Farben sortiert. Zusammengehörige Litzen werden mit einer Kontaktklemme mechanisch und elektrisch zu Kontakten 52, 53, 54, 55 miteinander verbunden.During production of the induction heating device 12 or the induction heating unit 20, a stranded cable 30, the strands of which have two different colors, is inserted into a spiral-like groove in a carrier (not shown) and glued to the carrier. The ends of the stranded wire 30 are split open and the strands are sorted according to their colors. Wires that belong together are mechanically and electrically connected to one another to form contacts 52, 53, 54, 55 using a contact clamp.

Es sind weitere dem Fachmann als geeignet erscheinende Markierungsmethoden, insbesondere durch unterschiedliche Muster, für die Litzen denkbar. Weiterhin ist denkbar, dass die Litzen nach Überprüfung eines elektrischen Kontakts zwischen den Enden der Litzenleitung 30 den unterschiedlichen Induktionsheizleitungen 32, 34 zugeordnet werden.Other marking methods which appear suitable to the person skilled in the art, in particular using different patterns, are conceivable for the strands. It is also conceivable that the stranded wires are assigned to the different induction heating lines 32, 34 after an electrical contact between the ends of the stranded wire 30 has been checked.

Weiterhin ist es denkbar, dass eine Heizfrequenzeinheit mehr als zwei, insbesondere drei, unterschiedliche Induktionsheizleitungen aufweist, die beieinander angeordnet sind. Ein entsprechender Betrieb von mehr als zwei, insbesondere von drei, Phasen, eine entsprechende Umgestaltung der Schaltung von Figur 3 vorausgesetzt, ist ebenso denkbar.Furthermore, it is conceivable that a heating frequency unit has more than two, in particular three, different induction heating lines that are arranged next to one another. A corresponding operation of more than two, in particular three, phases, a corresponding redesign of the circuit of figure 3 provided, is also conceivable.

Weiterhin ist es denkbar, erfindungsgemäße Induktionsheizeinheiten mit noch kleineren Durchmessern, beispielsweise 18 cm oder 15 cm, zu gestalten.Furthermore, it is conceivable to design induction heating units according to the invention with even smaller diameters, for example 18 cm or 15 cm.

BezugszeichenReference sign

1010
Hausgeräthome appliance
1212
Induktionsheizvorrichtunginduction heating device
1414
Durchmesserdiameter
2020
Induktionsheizeinheitinduction heating unit
2222
Induktionsheizeinheitinduction heating unit
2424
Induktionsheizeinheitinduction heating unit
2626
Induktionsheizeinheitinduction heating unit
2828
Induktionsheizeinheitinduction heating unit
3030
Litzenleitungstranded wire
3232
Induktionsheizleitunginduction heating line
3434
Induktionsheizleitunginduction heating line
4242
Heizfrequenzeinheitheating frequency unit
4343
Phasephase
4444
Heizfrequenzeinheitheating frequency unit
4545
Phasephase
5252
KontaktContact
5353
KontaktContact
5454
KontaktContact
5555
KontaktContact
6262
Elektronikbaugruppeelectronics assembly
6464
Elektronikbaugruppeelectronics assembly
7070
Kontrolleinheitcontrol unit
7272
Steuereinheitcontrol unit
7474
Schaltanordnungswitching arrangement
7575
Schaltelementswitching element

Claims (7)

  1. Induction heating apparatus, in particular induction hob apparatus, with at least one induction heating unit (20), which has at least two induction heating wires (32, 34), which are arranged close together and are provided to be supplied from different heat frequency units (42, 44), which comprise at least one inverter in each case, and with a control unit (70), which has at least one switching arrangement with at least one switching element, which is provided to assign at least one of the induction heating wires (32, 34) to the different heat frequency units (42, 44), characterised in that the at least two induction heating wires (32, 34) are each formed of strands of an individual stranded wire (30) and the strands of the stranded wire (30) are isolated electrically from one another.
  2. Induction heating apparatus according to claim 1, characterised in that the different heat frequency units (42, 44) are provided to be connected to different phases (43, 45) of a multiphase power supply.
  3. Induction heating apparatus according to claim 1 or 2, characterised in that the strands, which are provided to form different induction heating wires (32, 34), are coloured differently.
  4. Induction heating apparatus according to one of the preceding claims, characterised in that the at least one switching element is embodied as a changeover switch, wherein the control unit (70) is provided to assign the at least two induction heating wires (32, 34) to an individual or at least two different heat frequency units (42, 44).
  5. Induction heating apparatus according to one of the preceding claims, characterised in that the induction heating unit (20) has a diameter (14) which is smaller than 28 cm.
  6. Induction heating apparatus according to one of the preceding claims, characterised in that the induction heating wires (32, 34) are provided to jointly realise a power of at least 3700 W.
  7. Household appliance, in particular hob, having an induction heating apparatus (12) according to one of the preceding claims.
EP12815785.6A 2011-11-28 2012-11-20 Induction heating apparatus Active EP2786637B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201131914 2011-11-28
PCT/IB2012/056557 WO2013080088A2 (en) 2011-11-28 2012-11-20 Induction heating apparatus

Publications (2)

Publication Number Publication Date
EP2786637A2 EP2786637A2 (en) 2014-10-08
EP2786637B1 true EP2786637B1 (en) 2022-07-27

Family

ID=47559584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12815785.6A Active EP2786637B1 (en) 2011-11-28 2012-11-20 Induction heating apparatus

Country Status (3)

Country Link
EP (1) EP2786637B1 (en)
ES (1) ES2927333T3 (en)
WO (1) WO2013080088A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10455647B2 (en) 2014-11-26 2019-10-22 Samsung Electronics Co., Ltd. Cooking apparatus and method for controlling the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710062A (en) * 1971-04-06 1973-01-09 Environment One Corp Metal base cookware induction heating apparatus having improved power supply and gating control circuit using infra-red temperature sensor and improved induction heating coil arrangement
EP1931177A1 (en) * 2006-12-04 2008-06-11 BSH Bosch und Siemens Hausgeräte GmbH Heating device connection
WO2013064968A2 (en) * 2011-11-04 2013-05-10 BSH Bosch und Siemens Hausgeräte GmbH Induction heating apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06260270A (en) * 1993-03-03 1994-09-16 Matsushita Electric Ind Co Ltd Heating coil
FR2728132A1 (en) * 1994-12-09 1996-06-14 Bonnet Sa DEVICE FOR HEATING BY INDUCTION OF CONTAINER AND METHOD FOR CONTROLLING SUCH A DEVICE
DE202006016551U1 (en) * 2006-10-23 2008-03-06 E.G.O. Elektro-Gerätebau GmbH induction heating
JP4936971B2 (en) * 2007-04-24 2012-05-23 株式会社中部コーポレーション Large electromagnetic induction heating device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710062A (en) * 1971-04-06 1973-01-09 Environment One Corp Metal base cookware induction heating apparatus having improved power supply and gating control circuit using infra-red temperature sensor and improved induction heating coil arrangement
EP1931177A1 (en) * 2006-12-04 2008-06-11 BSH Bosch und Siemens Hausgeräte GmbH Heating device connection
WO2013064968A2 (en) * 2011-11-04 2013-05-10 BSH Bosch und Siemens Hausgeräte GmbH Induction heating apparatus

Also Published As

Publication number Publication date
ES2927333T3 (en) 2022-11-04
WO2013080088A3 (en) 2013-10-24
WO2013080088A2 (en) 2013-06-06
EP2786637A2 (en) 2014-10-08

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