EP1854337B1 - Heating device for an inductive cooking device - Google Patents
Heating device for an inductive cooking device Download PDFInfo
- Publication number
- EP1854337B1 EP1854337B1 EP05825303A EP05825303A EP1854337B1 EP 1854337 B1 EP1854337 B1 EP 1854337B1 EP 05825303 A EP05825303 A EP 05825303A EP 05825303 A EP05825303 A EP 05825303A EP 1854337 B1 EP1854337 B1 EP 1854337B1
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- European Patent Office
- Prior art keywords
- circuit
- heating
- inductors
- inductor
- resonant circuit
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 116
- 238000010411 cooking Methods 0.000 title claims abstract description 13
- 230000001939 inductive effect Effects 0.000 title abstract description 3
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 230000005284 excitation Effects 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 7
- 101100298225 Caenorhabditis elegans pot-2 gene Proteins 0.000 description 17
- 238000010586 diagram Methods 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 241001295925 Gegenes Species 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
-
- 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
- H05B6/04—Sources of current
-
- 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
- H05B6/36—Coil arrangements
- H05B6/44—Coil arrangements having more than one coil or coil segment
Definitions
- the invention relates to a heating device for a Indutationsgarêt according to the preamble of claim 1.
- an induction cooker having a plurality of inductors which is provided for heating a single heating element, for example a large pot, and arranged accordingly.
- one or more inductors can be connected by a switching means to a generator, which excites these inductors to heat the heating element for oscillating.
- the EP 0 926 926 A1 Induction cooking appliance which has a plurality of resonant circuits each having a single inductor and each having at least one capacitor.
- the invention relates to a heating device for a Indutationsgarêt with a first resonant circuit comprising at least a first inductor for transmitting heat energy to a heating element to be heated and a first circuit for exciting the first resonant circuit and supplying the heating energy to the inductor.
- the heating device comprises at least one second inductor for the transmission of heating energy to a heating element to be heated, which is part of the first resonant circuit, and a switching means by which the heating energy can be selectively connected to only one of the inductors or simultaneously two inductors in parallel ,
- a switching means by which the heating energy can be selectively connected to only one of the inductors or simultaneously two inductors in parallel ,
- the inductors do not necessarily have the same or at least similar impedances as for a serial circuit is appropriate, but it can, for example, a large main inductor and a much smaller secondary inductor can be used. Due to the relatively free choice of inductors a variety of differently designed Indudictionsgarieri can be developed with a uniform design.
- the switching means By the switching means one of the two or both inductors, preferably directly connected to the circuit for exciting the first resonant circuit.
- the induction cooking appliance can be held in a particularly simple manner if the supply of heating energy is effected by connecting voltage drawn from a power supply network. In this case, an additional resonant circuit can be dispensed with.
- the circuit for exciting the first resonant circuit preferably comprises a half-bridge circuit.
- the second inductor is operated exclusively with the first inductor together.
- the two inductors are expediently used for heating a single heating element, for example a single pot. They are preferably arranged in the immediate vicinity of each other. Large or elongated cooking appliances can be heated particularly effectively when the inductors are arranged in a contiguous heating area for heating a single heating element.
- both inductors can be connected by the switching means individually to the first circuit. Both inductors can be treated equally by an operator, and a small pot can e.g. optionally be placed on one or the other inductor for heating.
- the heating device comprises a rectifier to which both the first resonant circuit and a second resonant circuit with a second circuit for exciting the second resonant circuit and a further inductor are turned on.
- Unwanted noise when heating a cooking vessel can be avoided by a control unit which is prepared to control the circuits so that the first circuit always resonates the first resonant circuit at the same frequency as the second circuit stimulates the second resonant circuit.
- the Gleichscnies the resonant circuits can be performed independently of an operation of Indutechnischsgarêts.
- the heating device comprises a further circuit for exciting a further resonant circuit with a further inductor and a further switching means, wherein the further circuit is selectively connectable by the further switching means with the first or the further resonant circuit.
- the first resonant circuit can be transmitted by both circuits for excitation a large power without this electrical components of one of the circuits would have to be particularly stressed.
- the further circuit can support the first circuit by its performance.
- the heating device comprises a means for measuring a property of the resonant circuit successively with the switching means open and closed and for detecting whether the heating element is arranged on only one or both inductors. It can be automatically recognized, for example by means of a control unit, whether the heating element should be sufficiently heated with an inductor or more uniformly with both inductors, and the switching means can be switched automatically according to the more effective variant. A decision as to whether either or both of the inductors are to be used to heat the heating element can be saved to an operator.
- the heating device comprises a control unit which is provided for actuating the switching means at a moment at which no voltage is applied to the circuit for excitation of the resonant circuit is applied.
- the control unit is prepared to interrupt the voltage before switching the switching means or to set to a predetermined value.
- FIG. 1 shows a section through a pot 2 with a bottom of the pot, which is provided as a heating element 4 for a liquid located in the pot 2 or food.
- the pot 2 stands on a support plate 6 of an induction hob of a Indumiesgarêts, under which a heater 8 for inductive heating of the heating element 4 is arranged.
- the heater 8 comprises a plurality of winding blocks 10, each comprising an inner and an outer coil.
- the inner coils are in this case combined to form a first inductor 12 and the outer coils are combined to form a second inductor 14.
- the magnetic field generated by the two inductors 12, 14 is directed by a directional structure 16 to the heating element 4 and generates when flowing through the heating element 4 eddy currents that heat the heating element 4.
- a control unit 18 the generation of the magnetic field is controlled.
- FIG. 2 a circuit diagram of the heater 8 is shown, which is provided for connection to an AC voltage of a power supply network 20.
- the heating device 8 comprises the two inductors 12, 14, a capacitive element 22 with two capacitors, a half-bridge circuit 24 having two power transistors 28 for applying a switching voltage to one or both of the inductors 12, 14 and a rectifier 26 comprising two diodes.
- a switching means 30 the second inductor 14 in addition to the first inductor 12 are connected to the circuit 24.
- the circuit 24, the capacitive element 22 and one or both of the inductors 12, 14 form a resonant circuit 32 which can be excited by the circuit 24 to oscillate, the circuit 24 heating energy to heat the heating element of one or both of the inductors 12, 14 4 feeds.
- the first inductor 12 is disposed below a first heating portion 34 of the support plate 6, which in FIG. 3 is shown.
- the second inductor 14 is disposed below a second heating portion 36.
- the two heating sections 34, 36 are arranged directly next to each other and together form a heating area 38 for heating an oval or elongate heating element 4 of a cooking vessel, for example a casserole or a fish pot.
- the switching means 30 only the first inductor 12 is connected to the circuit 24 for exciting the resonant circuit 32.
- the second inductor 14 does not resonate with the excitation of the resonant circuit 32 by the circuit 24. Heat in the heating element 4 is thus generated only by the magnetic field caused by the first inductor 12.
- This position of the switching means 30 is suitable for heating a small pot 2 with a small heating element 4, which stands on the first Schuteil Scheme 34.
- the switching means 30 can be closed and the second inductor 14 are connected to the circuit 24. Now swing both inductors 12, 14, whereby the full heating area 38 is charged with a provided for heating the heating element 4 magnetic field.
- the second inductor 14 may be dimensioned smaller in this example in its performance than the first inductor, since the second Schuteil Scheme 36 of the surface is slightly smaller than the first Schuteil Scheme 34.
- the heating powers of the inductors 12, 14 always in a fixed, predetermined relationship to each other.
- a heating area 40 with two concentrically arranged heating sections 42, 44, as in FIG. 3 is shown.
- a smaller first Schuteil Complex 42 is surrounded by a larger second Schuteil Complex 44 annular.
- the switching means 30 is opened, so that the first inductor 12 is connected to the circuit 24.
- the switching means 30 is closed, and the second inductor 14, which is made more powerful in this example than the first inductor 12, is also connected to the circuit 24 for exciting the resonant circuit 32.
- FIG. 4 shows a block diagram of the heater 8 from FIG. 2 ,
- the heater 8 includes the rectifier 26, the circuit 24, the two inductors 12, 14, and the switching means 30.
- FIG. 5 The block diagram shown shows an alternative heating device 46, to whose rectifier 48 two circuits 50, 52 for the excitation of each resonant circuit 54, 56 are connected.
- the first resonant circuit 54 here comprises two inductors 58, 60, of which the inductor 60 can be connected to the first circuit 50 via a switching means 62.
- the second resonant circuit 56 comprises only a single inductor 64.
- Both circuits 50, 52 are individually controllable by the control unit 18, so that together with the switching means 62 one, two or three inductors 58, 60, 64 can be activated.
- Such a heater 46 is particularly suitable for a like in FIG.
- the two circuits 50, 52 are always controlled by the control unit 18 so that all excited inductors 58, 60, 64 are excited to oscillate at the same frequency in order to avoid interference oscillations in the pot 2.
- FIG. 6 shows a heater 74, which is particularly suitable for heating areas 76, 78 as in FIG. 3 shown.
- Two inductors 80, 82 are individually or jointly connectable via a respective switching means 84, 86 with the circuit 24 for exciting the resonant circuit 32.
- the inductors 80, 82 have, for example, the same power ranges and are therefore particularly suitable for arrangement under the same Schuteil Schemeen 88, 90 or 92, 94 of the heating areas 76 and 78, each for heating a very small or small pot 2 or common heating a medium-sized or large elongated pot 2 are provided.
- the inductors 80, 82 are individually connectable to the circuit 24.
- both switching means 84, 86 are closed and both inductors 80, 82 are connected to the circuit 24 and thereby excited to transmit energy to the heating element 4.
- FIG. 7 The diagram shown shows the power P of the inductors 12, 14 and 80, 82 plotted against the switching frequency f s of the circuit 24.
- the power P is plotted with respect to the maximum power P max of the inductor 12 alone, or 80 or 82, and the switching frequency f s is normalized with respect to the resonant frequency f r of the resonant circuit 32 with only one inductor 12 or 80 or 82 connected.
- the curve 96 indicates the power of an inductor 12 or 80 or 82 connected individually to the circuit 24.
- the control unit 18 sets a switching frequency f s corresponding to the desired power P between, for example, 1.0 f r and 1.8 f r .
- the power is variable in this example between P max and 0.2 P max .
- FIG. 8 shows a further embodiment, with which this relative power loss can be counteracted.
- a heating device 104 Shown is a heating device 104, whose components 8 to the heating device are always identified by the same reference numerals. Furthermore, with respect to the same features and functions on the description of the embodiment in the Figures 2 and 4 to get expelled.
- the heating device 104 has a further circuit 106 for exciting a further oscillating circuit 108 with a further inductor 110.
- the heating device 104 comprises two further switching means 112, 114, which - as well as the switching means 30 - are actuated by the control unit 18.
- the inductor 110 may be connected to the circuit 106 and the inductors 12, 14 to the circuit 24 or the inductor 110 to the circuits 24 and 106 or the inductors 12, 14 to the circuits 24 and 106 ,
- both circuits 24 and 106 can excite the inductors 12, 14 and thus - without a large load on the electrical components of the circuits 24, 106 - both inductors 12, 14 individually with the in FIG. 7 shown curve 96 or together with the power P to curve 98 are operated.
- This is particularly suitable for use with the heating region 40, each with large heating portions 42, 44 for heating a very large pot 2. It is also possible to arrange all three inductors 12, 14, 110 for use with the heating region 66 immediately adjacent to each other Thompsonteil Schemee 68, 70 with particularly high power P or all three Walkerteil Schemee 68, 70, 72 with distributed power P to operate.
- the control unit 18 is provided for determining a variable associated with the inductance of the oscillating circuit 32. By measuring this size both with the switching means 30 closed and with the switching means 30 open, the arrangement of a large or a small pot 2 in the heating area 40 can be concluded, and the switching means 30 for efficient heating of the pot 2 or its heating element 4 can be switched accordingly become.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Induction Heating Cooking Devices (AREA)
- Cookers (AREA)
- General Induction Heating (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
Description
Die Erfindung geht aus von einer Heizeinrichtung für ein Induktionsgargerät nach dem Oberbegriff des Anspruchs 1.The invention relates to a heating device for a Induktionsgargerät according to the preamble of claim 1.
Aus der
Es ist die Aufgabe der vorliegenden Erfindung, eine gattungsgemäße Vorrichtung bereitzustellen, mit der unterschiedliche Garbehälter effektiv erwärmt werden können.It is the object of the present invention to provide a generic device with which different cooking containers can be effectively heated.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst, während vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung den Unteransprüchen entnommen werden können.This 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 Heizeinrichtung für ein Induktionsgargerät mit einem ersten Schwingkreis, der mindestens einen ersten Induktor zur Übertragung von Heizenergie auf ein zu erwärmendes Heizelement und eine erste Schaltung zur Anregung des ersten Schwingkreises und Zuführung der Heizenergie zu dem Induktor umfasst.The invention relates to a heating device for a Induktionsgargerät with a first resonant circuit comprising at least a first inductor for transmitting heat energy to a heating element to be heated and a first circuit for exciting the first resonant circuit and supplying the heating energy to the inductor.
Es wird vorgeschlagen, dass die Heizeinrichtung mindestens einen zweiten Induktor zur Übertragung von Heizenergie auf ein zu erwärmendes Heizelement, der Teil des ersten Schwingkreises ist, und ein Schaltmittel umfasst, durch das die Heizenergie wahlweise nur einem der Induktoren oder gleichzeitig beiden Induktoren in Parallelschaltung zuführbar ist. Durch das wahlweise Zuführen der Heizenergie zu nur einem der Induktoren oder gleichzeitig zu beiden Induktoren können auf einem einzigen Heizbereich sowohl kleine als auch große oder längliche Garbehälter effektiv erwärmt werden. Durch die Parallelschaltung der beiden Induktoren können Induktoren mit unterschiedlichen Impedanzen verwendet werden. Die Induktoren müssen nicht unbedingt gleiche oder zumindest ähnliche Impedanzen aufweisen, wie es für eine serielle Schaltung zweckmäßig ist, sondern es kann beispielsweise ein großer Hauptinduktor und ein wesentlich kleinerer Nebeninduktor verwendet werden. Durch die relativ freie Wahlmöglichkeit der Induktoren kann eine Vielzahl unterschiedlich ausgestalteter Induktionsgargeräte mit einheitlicher Konzeption entwickelt werden.It is proposed that the heating device comprises at least one second inductor for the transmission of heating energy to a heating element to be heated, which is part of the first resonant circuit, and a switching means by which the heating energy can be selectively connected to only one of the inductors or simultaneously two inductors in parallel , By selectively supplying the heating energy to only one of the inductors or simultaneously to both inductors, both small and large or elongated cooking containers can be effectively heated on a single heating zone. Through the parallel connection Inductors with different impedances can be used for the two inductors. The inductors do not necessarily have the same or at least similar impedances as for a serial circuit is appropriate, but it can, for example, a large main inductor and a much smaller secondary inductor can be used. Due to the relatively free choice of inductors a variety of differently designed Induktionsgargeräte can be developed with a uniform design.
Durch das Schaltmittel können einer der beiden oder beide Induktoren, vorzugsweise direkt, mit der Schaltung zur Anregung des ersten Schwingkreises verbunden werden. Besonders einfach kann das Induktionsgargerät gehalten werden, wenn die Versorgung mit Heizenergie durch Aufschaltung von aus einem Stromversorgungsnetz bezogener Spannung erfolgt. Auf einen zusätzlichen Schwingkreis kann hierbei verzichtet werden. Die Schaltung zur Anregung des ersten Schwingkreises umfasst vorzugsweise eine Halbbrückenschaltung. In einer besonders preisgünstigen Ausgestaltung der Erfindung wird der zweite Induktor ausschließlich mit dem ersten Induktor zusammen betrieben.By the switching means one of the two or both inductors, preferably directly connected to the circuit for exciting the first resonant circuit. The induction cooking appliance can be held in a particularly simple manner if the supply of heating energy is effected by connecting voltage drawn from a power supply network. In this case, an additional resonant circuit can be dispensed with. The circuit for exciting the first resonant circuit preferably comprises a half-bridge circuit. In a particularly inexpensive embodiment of the invention, the second inductor is operated exclusively with the first inductor together.
Die beiden Induktoren dienen zweckmäßigerweise zum Aufheizen eines einzigen Heizelements, beispielsweise eines einzigen Topfs. Sie sind vorzugsweise in unmittelbarer Nachbarschaft zueinander angeordnet. Große oder längliche Gargeräte können besonders effektiv erwärmt werden, wenn die Induktoren in einem zusammenhängenden Heizbereich zur Erwärmung eines einzigen Heizelements angeordnet sind.The two inductors are expediently used for heating a single heating element, for example a single pot. They are preferably arranged in the immediate vicinity of each other. Large or elongated cooking appliances can be heated particularly effectively when the inductors are arranged in a contiguous heating area for heating a single heating element.
Der Gefahr eines ungleichmäßigen Erwärmens eines Gargefäßes durch gleichzeitig beide Induktoren kann entgegengewirkt werden, wenn die Heizleistungen der Induktoren in einem festen, vorbestimmten Verhältnis zueinander stehen. So kann beispielsweise ein Induktor, dem gegenüber dem anderen Induktor ein kleinerer Heizteilbereich zugeordnet ist, grundsätzlich mit einer kleineren Leistung betrieben werden als der andere Induktor.The risk of uneven heating of a cooking vessel by simultaneously both inductors can be counteracted when the heating powers of the inductors are in a fixed, predetermined relationship to each other. Thus, for example, an inductor, which is assigned to the other inductor, a smaller Heizteilbereich, basically operated with a smaller power than the other inductor.
Eine besonders komfortable Bedienung des Induktionsgargeräts kann erreicht werden, wenn beide Induktoren durch das Schaltmittel einzeln an die erste Schaltung anschaltbar sind. Beide Induktoren können von einem Bediener gleich behandelt werden, und ein kleiner Topf kann z.B. wahlweise über den einen oder den anderen Induktor zum Aufheizen gestellt werden.A particularly convenient operation of Induktionsgargeräts can be achieved if both inductors can be connected by the switching means individually to the first circuit. Both inductors can be treated equally by an operator, and a small pot can e.g. optionally be placed on one or the other inductor for heating.
In einer weiteren Ausgestaltung der Erfindung umfasst die Heizeinrichtung einen Gleichrichter, an den sowohl der erste Schwingkreis als auch ein zweiter Schwingkreis mit einer zweiten Schaltung zur Anregung des zweiten Schwingkreises und einem weiteren Induktor angeschaltet sind. Hierdurch kann ein einziges Heizfeld zur Erwärmung eines einzigen Gargefäßes durch drei oder mehr Induktoren effektiv erwärmt werden, wobei nur ein Generator mit einem Gleichrichter zum Einsatz kommt und eine hohe angeforderte Leistung durch zwei Schwingkreise erbracht werden kann.In a further embodiment of the invention, the heating device comprises a rectifier to which both the first resonant circuit and a second resonant circuit with a second circuit for exciting the second resonant circuit and a further inductor are turned on. As a result, a single heating field for heating a single cooking vessel can be effectively heated by three or more inductors, with only one generator with a rectifier is used and a high requested power can be provided by two resonant circuits.
Unerwünschte Geräusche beim Erwärmen eines Gargefäßes können durch eine Steuereinheit vermieden werden, die dazu vorbereitet ist, die Schaltungen so zu steuern, dass die erste Schaltung den ersten Schwingkreis stets mit der gleichen Frequenz zum Schwingen anregt wie die zweite Schaltung den zweiten Schwingkreis. Die Gleichschaltung der Schwingkreise kann hierbei unabhängig von einer Bedienung des Induktionsgargeräts ausgeführt sein.Unwanted noise when heating a cooking vessel can be avoided by a control unit which is prepared to control the circuits so that the first circuit always resonates the first resonant circuit at the same frequency as the second circuit stimulates the second resonant circuit. The Gleichschaltung the resonant circuits can be performed independently of an operation of Induktionsgargeräts.
Zusätzlich wird vorgeschlagen, dass die Heizeinrichtung eine weitere Schaltung zur Anregung eines weiteren Schwingkreises mit einem weiteren Induktor und ein weiteres Schaltmittel umfasst, wobei die weitere Schaltung durch das weitere Schaltmittel wahlweise mit dem ersten oder dem weiteren Schwingkreis verbindbar ist. Dem ersten Schwingkreis kann durch beide Schaltungen zur Anregung eine große Leistung übertragen werden, ohne dass dadurch elektrische Bausteine einer der Schaltungen besonders stark beansprucht werden müssten. Die weitere Schaltung kann die erste Schaltung durch ihre Leistung unterstützen.In addition, it is proposed that the heating device comprises a further circuit for exciting a further resonant circuit with a further inductor and a further switching means, wherein the further circuit is selectively connectable by the further switching means with the first or the further resonant circuit. The first resonant circuit can be transmitted by both circuits for excitation a large power without this electrical components of one of the circuits would have to be particularly stressed. The further circuit can support the first circuit by its performance.
Vorteilhafterweise umfasst die Heizeinrichtung ein Mittel, das zum Ausmessen einer Eigenschaft des Schwingkreises nacheinander bei geöffnetem und bei geschlossenem Schaltmittel und zur Erkennung, ob das Heizelement an nur einem oder an beiden Induktoren angeordnet ist, vorgesehen ist. Es kann automatisch erkannt werden, beispielsweise mit Hilfe einer Steuereinheit, ob das Heizelement ausreichend mit einem Induktor oder gleichmäßiger mit beiden Induktoren erwärmt werden sollte, und das Schaltmittel kann automatisch gemäß der effektiveren Variante geschaltet werden. Eine Entscheidung, ob einer der beiden oder beide Induktoren zum Erwärmen des Heizelements verwendet werden sollen, kann einem Bediener erspart werden.Advantageously, the heating device comprises a means for measuring a property of the resonant circuit successively with the switching means open and closed and for detecting whether the heating element is arranged on only one or both inductors. It can be automatically recognized, for example by means of a control unit, whether the heating element should be sufficiently heated with an inductor or more uniformly with both inductors, and the switching means can be switched automatically according to the more effective variant. A decision as to whether either or both of the inductors are to be used to heat the heating element can be saved to an operator.
Zweckmäßigerweise umfasst die Heizeinrichtung eine Steuereinheit, die zur Betätigung des Schaltmittels in einem Moment vorgesehen ist, an dem keine Spannung an der Schaltung zur Anregung des Schwingkreises anliegt. Hierdurch kann ein sicheres Umschalten des Schaltmittels ohne besondere Beanspruchung der elektrischen Bausteine des Induktionsgargeräts erreicht werden. Vorteilhafterweise ist die Steuereinheit dazu vorbereitet, die Spannung vor einer Schaltung des Schaltmittels zu unterbrechen oder auf einen vorbestimmten Wert einzustellen.Conveniently, the heating device comprises a control unit which is provided for actuating the switching means at a moment at which no voltage is applied to the circuit for excitation of the resonant circuit is applied. In this way, a safe switching of the switching means can be achieved without special stress of the electrical components of Induktionsgargeräts. Advantageously, the control unit is prepared to interrupt the voltage before switching the switching means or to set to a predetermined value.
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
- eine schematische Schnittdarstellung durch einen Topf und einen Teil eines Induktionskochfelds,
- Fig. 2
- ein Schaltbild eines Schwingkreises mit zwei Induktoren und einem Schaltmittel zwischen den beiden Induktoren,
- Fig. 3
- 5 verschiedene Heizbereiche für ein Induktionskochfeld mit mehreren, jeweils einem Induktor zugeordneten Heizteilfeldern,
- Fig. 4
- ein Blockschaltbild einer Heizeinheit
wie aus Figur 2 , - Fig. 5
- ein Blockschaltbild einer weiteren Heizeinheit mit drei Induktoren und zwei Schaltungen zur Anregung jeweils eines Schwingkreises,
- Fig. 6
- ein Schaltbild einer weiteren Heizeinrichtung mit zwei Induktoren und einem Schaltmittel, mit dem wahlweise einer der beiden Induktoren oder beide Induktoren gleichzeitig angeregt werden können,
- Fig. 7
- Heizleistungen verschiedener Schwingkreise bzw. Induktoren, jeweils aufgetragen gegen ihre Anregungsfrequenz und
- Fig. 8
- ein Schaltbild einer weiteren Heizeinrichtung mit drei Induktoren und einer zweiten Schaltung, die zur Verstärkung einer ersten Schaltung zur Anregung eines Schwingkreises verwendet werden kann.
- Fig. 1
- a schematic sectional view through a pot and a part of an induction hob,
- Fig. 2
- a circuit diagram of a resonant circuit with two inductors and a switching means between the two inductors,
- Fig. 3
- 5 different heating areas for an induction hob with a plurality of heating element fields, each associated with an inductor,
- Fig. 4
- a block diagram of a heating unit as off
FIG. 2 . - Fig. 5
- a block diagram of another heating unit with three inductors and two circuits for exciting each resonant circuit,
- Fig. 6
- a circuit diagram of a further heating device with two inductors and a switching means with which either one of the two inductors or both inductors can be excited simultaneously,
- Fig. 7
- Heat outputs of various resonant circuits or inductors, each plotted against their excitation frequency and
- Fig. 8
- a circuit diagram of another heater with three inductors and a second circuit which can be used to amplify a first circuit for exciting a resonant circuit.
In
Die in den
Der erste Induktor 12 ist unter einem ersten Heizteilbereich 34 der Tragplatte 6 angeordnet, der in
Der zweite Induktor 14 schwingt bei einer Anregung des Schwingkreises 32 durch die Schaltung 24 hingegen nicht mit. Wärme im Heizelement 4 wird somit nur durch das vom ersten Induktor 12 verursachte Magnetfeld erzeugt. Diese Stellung des Schaltmittels 30 ist geeignet zur Erwärmung eines kleinen Topfs 2 mit einem kleinen Heizelement 4, das auf dem ersten Heizteilbereich 34 steht. Bei Verwendung eines größeren, länglichen Topfs 2 kann das Schaltmittel 30 geschlossen und der zweite Induktor 14 an die Schaltung 24 angeschaltet werden. Nun schwingen beide Induktoren 12, 14, wodurch der volle Heizbereich 38 mit einem zur Erwärmung des Heizelements 4 vorgesehenen Magnetfeld beschickt wird. Der zweite Induktor 14 kann in diesem Beispiel in seiner Leistung geringer bemessen sein als der erste Induktor, da der zweite Heizteilbereich 36 von der Fläche etwas kleiner ist als der erste Heizteilbereich 34. Hierbei stehen die Heizleistungen der Induktoren 12, 14 stets in einem festen, vorbestimmten Verhältnis zueinander.The
Zur Erwärmung großer, kreisrunder Töpfe eignet sich besonders ein Heizbereich 40 mit zwei konzentrisch zueinander angeordneten Heizteilbereichen 42, 44, wie in
Das in
Das in
Wie aus den Kurven 96, 98, 100, 102 ersichtlich ist, verschiebt sich bei einem Schalten des Schaltmittels 30 nicht nur die Leistung P, sondern auch die Resonanzfrequenz fr des Schwingkreises 32. Daher wird durch die Steuereinheit 18 vor einem Schalten des Schaltmittels 30 die Spannung zu den Induktoren 12, 14 bzw. 80, 82 unterbrochen, um eine hohe Belastung der elektrischen Bauteile der Heizeinrichtung 8, 46, 74 zu vermeiden. Wie aus
Zur Erkennung, ob beispielsweise auf dem Heizbereich 40 ein kleiner Topf 2 lediglich auf dem Heizteilbereich 42 oder ein großer Topf auch auf dem Heizteilbereich 44 angeordnet ist, ist die Steuereinheit 18 zur Bestimmung einer mit der Induktivität des Schwingkreises 32 zusammenhängenden Größe vorgesehen. Durch Ausmessung dieser Größe sowohl bei geschlossenem Schaltmittel 30 als auch bei geöffnetem Schaltmittel 30 kann auf die Anordnung eines großen oder eines kleinen Topfs 2 im Heizbereich 40 geschlossen werden, und das Schaltmittel 30 zur effizienten Erwärmung des Topfs 2 bzw. dessen Heizelements 4 kann entsprechend geschaltet werden.To detect whether, for example, a
- 22
- Topfpot
- 44
- Heizelementheating element
- 66
- Tragplattesupport plate
- 88th
- Heizeinrichtungheater
- 1010
- Wicklungsblöckewinding blocks
- 1212
- Induktorinductor
- 1414
- Induktorinductor
- 1616
- Richtstrukturdirectional structure
- 1818
- Steuereinheitcontrol unit
- 2020
- StromversorgungsnetzPower supply network
- 2222
- Elementelement
- 2424
- Schaltungcircuit
- 2626
- Gleichrichterrectifier
- 2828
- Leistungstransistorpower transistor
- 3030
- Schaltmittelswitching means
- 3232
- Schwingkreisresonant circuit
- 3434
- HeizteilbereichHeizteilbereich
- 3636
- HeizteilbereichHeizteilbereich
- 3838
- Heizbereichheating
- 4040
- Heizbereichheating
- 4242
- HeizteilbereichHeizteilbereich
- 4444
- HeizteilbereichHeizteilbereich
- 4646
- Heizeinrichtungheater
- 4848
- Gleichrichterrectifier
- 5050
- Schaltungcircuit
- 5252
- Schaltungcircuit
- 5454
- Schwingkreisresonant circuit
- 5656
- Schwingkreisresonant circuit
- 5858
- Induktorinductor
- 6060
- Induktorinductor
- 6262
- Schaltmittelswitching means
- 6464
- Induktorinductor
- 6666
- Heizbereichheating
- 6868
- HeizteilbereichHeizteilbereich
- 7070
- HeizteilbereichHeizteilbereich
- 7272
- HeizteilbereichHeizteilbereich
- 7474
- Heizeinrichtungheater
- 7676
- Heizbereichheating
- 7878
- Heizbereichheating
- 8080
- Induktorinductor
- 8282
- Induktorinductor
- 8484
- Schaltmittelswitching means
- 8686
- Schaltmittelswitching means
- 8888
- HeizteilbereichHeizteilbereich
- 9090
- HeizteilbereichHeizteilbereich
- 9292
- HeizteilbereichHeizteilbereich
- 9494
- HeizteilbereichHeizteilbereich
- 9696
- KurveCurve
- 9898
- KurveCurve
- 100100
- KurveCurve
- 102102
- KurveCurve
- 104104
- Heizeinrichtungheater
- 106106
- Schaltungcircuit
- 108108
- Schwingkreisresonant circuit
- 110110
- Induktorinductor
- 112112
- Schaltmittelswitching means
- 114114
- Schaltmittelswitching means
Claims (9)
- Heating device (8; 46; 74; 104) for an induction cooking appliance with a first resonant circuit (32, 54), which comprises at least one first inductor (12; 58; 80; 82) for transmission of heat energy to a heating element (4) to be heated and a first circuit (24; 50) for excitation of the first resonant circuit (32, 54) and feeding the heat energy to the inductor (12; 58; 80; 82), characterised by at least one second inductor (14, 60, 80, 82) for transmission of heat energy to a heating element (4) to be heated, which is part of the first resonant circuit (32, 54), and by a switching means (30; 62; 84; 86) by which the heat energy can be supplied selectably only to one of the inductors (12; 58; 80; 82) or simultaneously to both inductors (12, 14; 58, 50; 80, 82) in parallel.
- Heating device (8; 46; 74; 104) according to claim 1, characterised in that the inductors (12, 14; 58, 60; 80, 82) are arranged in a cohesive heating region (38; 40; 66; 76; 78) for heating a single heating element (4).
- Heating device (8; 46; 74; 104) according to claim 1 or 2, characterised in that the heat outputs of the inductors (12, 14; 58, 50; 80, 82) are in a fixed predetermined ratio to one another.
- Heating device (74) according to any one of the preceding claims, characterised in that the two inductors (80, 82) are individually connectible with the first circuit (24) by the switching means (84, 86).
- Heating device (46) according to any one of the preceding claims, characterised by a rectifier (48) with which are connected not only the first resonant circuit (54), but also a second resonant circuit (56) with a second circuit (62) for excitation of the second resonant circuit (56) and a further inductor (64).
- Heating device (46) according to claim 5, characterised by a control unit (18) which is provided for the purpose of so controlling the circuits (50, 52) that the first circuit (50) excites the first resonant circuit (54) to always resonate at the same frequency as the second circuit (52) excites the second resonant circuit (56).
- Heating device (104 according to any one of the preceding claims, characterised by a further circuit (106) for excitation of a further resonant circuit (108) with a further inductor (110) and a further switching means (112, 114), wherein the further circuit (106) is selectably connectible with the first or the second resonant circuit (108) by the further switching means (112, 114).
- Heating device (8; 46; 74; 104) according to any one of the preceding claims, characterised by a means which is provided for measuring a characteristic of the resonant circuit (32; 54, 56) in succession with opened and with closed switching means (30; 62; 84, 86) and for recognition whether the heating element (4) is arranged at only one or at both inductors (12, 14; 58, 60; 80, 82).
- Heating device (8; 46; 74; 104) according to any one of the preceding claims, characterised by a control unit which is provided for actuation of the switching means (30; 62; 84, 86) at an instant in which no voltage lies at the circuit (24; 50, 52; 106) for excitation of the resonant circuit (32; 54, 56; 108).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL05825303T PL1854337T3 (en) | 2005-03-01 | 2005-12-27 | Heating device for an inductive cooking device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200500543A ES2265758B1 (en) | 2005-03-01 | 2005-03-01 | HEATING DEVICE FOR AN INDUCTION KITCHEN. |
PCT/EP2005/057179 WO2006092179A1 (en) | 2005-03-01 | 2005-12-27 | Heating device for an inductive cooking device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1854337A1 EP1854337A1 (en) | 2007-11-14 |
EP1854337B1 true EP1854337B1 (en) | 2012-03-21 |
Family
ID=35886329
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05825303A Revoked EP1854337B1 (en) | 2005-03-01 | 2005-12-27 | Heating device for an inductive cooking device |
Country Status (7)
Country | Link |
---|---|
US (1) | US8030601B2 (en) |
EP (1) | EP1854337B1 (en) |
AT (1) | ATE550909T1 (en) |
DK (1) | DK1854337T3 (en) |
ES (2) | ES2265758B1 (en) |
PL (1) | PL1854337T3 (en) |
WO (1) | WO2006092179A1 (en) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202006016551U1 (en) * | 2006-10-23 | 2008-03-06 | E.G.O. Elektro-Gerätebau GmbH | induction heating |
ES2310960B1 (en) * | 2006-11-08 | 2009-11-05 | Bsh Electrodomesticos España S.A. | HEATING DEVICE CIRCUIT. |
ES2330496B1 (en) † | 2007-10-31 | 2010-09-08 | Bsh Electrodomesticos España, S.A. | COOKING DEVICE. |
ES2335256B1 (en) | 2008-01-14 | 2011-01-17 | Bsh Electrodomesticos España, S.A. | INDUCTION COOKING FIELD WITH A PLURALITY OF INDUCTION HEATING BODIES. |
KR101353313B1 (en) * | 2008-02-25 | 2014-01-21 | 삼성전자주식회사 | Electric range and induction coil unit |
DE102009018134A1 (en) * | 2009-04-15 | 2010-09-16 | E.G.O. Elektro-Gerätebau GmbH | Induction heating device for induction cooker, comprises three induction coils that are arranged, such that central induction coil is arranged between two outer induction coils |
ES2366514B1 (en) * | 2009-05-15 | 2012-10-09 | Bsh Electrodomesticos España S.A. | DEVICE FOR PLACEMENT ON AN INDUCTION COOKING FIELD. |
ES2362607B1 (en) * | 2009-08-27 | 2012-06-05 | Bsh Electrodomésticos España, S.A. | MULTIPLEXATION OF INDUCTION HEATING LOADS. |
EP3771288B1 (en) * | 2009-10-05 | 2021-12-15 | Whirlpool Corporation | Method for supplying power to induction cooking zones of an induction cooking hob having a plurality of power converters, and induction cooking hob using such method |
ES2378607B1 (en) * | 2009-11-05 | 2013-03-14 | BSH Electrodomésticos España S.A. | COOKING FIELD WITH AT LEAST TWO HEATING INDUCTORS. |
US20120261405A1 (en) * | 2009-12-11 | 2012-10-18 | Panasonic Corporation | Induction heating apparatus and induction heating cooker provided with same |
ES2388269B1 (en) | 2010-03-03 | 2013-08-23 | BSH Electrodomésticos España S.A. | COOKING HOB WITH AT LEAST ONE COOKING AREA, AND PROCEDURE TO OPERATE A COOKING HOB. |
ES2388303B1 (en) | 2010-03-03 | 2013-08-23 | BSH Electrodomésticos España S.A. | COOKING HOB WITH AT LEAST ONE COOKING AREA, AND PROCEDURE TO OPERATE A COOKING HOB. |
ES2388028B1 (en) | 2010-03-03 | 2013-08-23 | Bsh Electrodomésticos España, S.A. | COOKING HOB WITH AT LEAST ONE COOKING AREA AND PROCEDURE TO OPERATE A COOKING HOB. |
EP2506671B1 (en) | 2011-03-29 | 2017-09-13 | BSH Hausgeräte GmbH | Switch device |
FR2984038B1 (en) * | 2011-12-13 | 2018-09-21 | Fagorbrandt | INVERTER SUPPLY DEVICE, IN PARTICULAR FOR INDUCTION COOKING APPARATUS |
CN110463344B (en) * | 2017-03-24 | 2021-09-24 | 三菱电机株式会社 | Induction heating cooker |
EP3603339B1 (en) * | 2017-03-30 | 2021-10-13 | BSH Hausgeräte GmbH | Induction cooktop device |
KR102071957B1 (en) * | 2018-04-19 | 2020-01-31 | 엘지전자 주식회사 | Induction heating device having improved control algorithm and circuit structure |
KR102082507B1 (en) * | 2018-05-16 | 2020-02-27 | 엘지전자 주식회사 | Induction heating device having improved control algorithm and circuit structure |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
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NL296433A (en) | 1962-08-09 | |||
JPS59149683A (en) * | 1983-01-28 | 1984-08-27 | 株式会社東芝 | Induction heating cooking device |
JPH02114488A (en) * | 1988-10-25 | 1990-04-26 | Matsushita Electric Ind Co Ltd | Induction heating cooker |
EP0376760A1 (en) * | 1988-12-27 | 1990-07-04 | Bonnet S.A. | Electric induction-cooking appliance |
JP2722738B2 (en) * | 1989-12-20 | 1998-03-09 | 松下電器産業株式会社 | Induction heating device |
JP2943017B2 (en) * | 1991-01-16 | 1999-08-30 | 松下電器産業株式会社 | Pot detection device for induction heating cooker |
FR2672763B1 (en) * | 1991-02-08 | 1993-05-07 | Bonnet Sa | INDUCING DEVICE FOR INDUCTION HEATING OF KITCHEN CONTAINERS AND METHOD FOR CONTROLLING SUCH A DEVICE. |
FR2773014B1 (en) | 1997-12-23 | 2000-03-03 | Europ Equip Menager | DEVICE FOR SUPPLYING MULTIPLE RESONANT CIRCUITS BY AN INVERTER POWER GENERATOR |
FR2806868B1 (en) * | 2000-03-21 | 2002-06-28 | Brandt Cooking | DEVICE FOR HEATING BY INDUCTION OF CULINARY CONTAINER |
DE10231122A1 (en) * | 2002-07-05 | 2004-01-22 | E.G.O. Elektro-Gerätebau GmbH | Method of measuring the temperature of a metal cooking vessel |
JP2004296279A (en) * | 2003-03-27 | 2004-10-21 | Hitachi Hometec Ltd | Induction heating cooker |
DE10314690A1 (en) * | 2003-03-27 | 2004-10-07 | E.G.O. Elektro-Gerätebau GmbH | Heating device for flat heating with induction heating elements |
US7022952B2 (en) * | 2003-08-26 | 2006-04-04 | General Electric Company | Dual coil induction heating system |
-
2005
- 2005-03-01 ES ES200500543A patent/ES2265758B1/en not_active Expired - Fee Related
- 2005-12-27 US US11/885,324 patent/US8030601B2/en not_active Expired - Fee Related
- 2005-12-27 DK DK05825303.0T patent/DK1854337T3/en active
- 2005-12-27 AT AT05825303T patent/ATE550909T1/en active
- 2005-12-27 PL PL05825303T patent/PL1854337T3/en unknown
- 2005-12-27 EP EP05825303A patent/EP1854337B1/en not_active Revoked
- 2005-12-27 WO PCT/EP2005/057179 patent/WO2006092179A1/en not_active Application Discontinuation
- 2005-12-27 ES ES05825303T patent/ES2383963T3/en active Active
Also Published As
Publication number | Publication date |
---|---|
ES2265758A1 (en) | 2007-02-16 |
US8030601B2 (en) | 2011-10-04 |
WO2006092179A1 (en) | 2006-09-08 |
EP1854337A1 (en) | 2007-11-14 |
ES2265758B1 (en) | 2007-11-16 |
US20080164249A1 (en) | 2008-07-10 |
DK1854337T3 (en) | 2012-07-09 |
ES2383963T3 (en) | 2012-06-27 |
ATE550909T1 (en) | 2012-04-15 |
PL1854337T3 (en) | 2012-08-31 |
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