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EP0993233A2 - Inductor for induction-cooktop - Google Patents

Inductor for induction-cooktop Download PDF

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Publication number
EP0993233A2
EP0993233A2 EP99119127A EP99119127A EP0993233A2 EP 0993233 A2 EP0993233 A2 EP 0993233A2 EP 99119127 A EP99119127 A EP 99119127A EP 99119127 A EP99119127 A EP 99119127A EP 0993233 A2 EP0993233 A2 EP 0993233A2
Authority
EP
European Patent Office
Prior art keywords
inductor
substrate
coils
spiral
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99119127A
Other languages
German (de)
French (fr)
Other versions
EP0993233B1 (en
EP0993233A3 (en
Inventor
Markus Theine
Jose-Ramon Garcia
Pablo Hernandez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Balay SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH, Balay SA filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP0993233A2 publication Critical patent/EP0993233A2/en
Publication of EP0993233A3 publication Critical patent/EP0993233A3/en
Application granted granted Critical
Publication of EP0993233B1 publication Critical patent/EP0993233B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • H05B6/1281—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements with flat coils

Definitions

  • the present invention relates to an inductor for arrangement below a cooktop an induction hob with at least two inductor coils, one above the other are arranged at a distance.
  • Such an inductor is known from the publication WO 89/04109, the design and the arrangement of the inductor coils is such that each field point is outside the one to be heated Cooking area, which is covered by the placed pot, the field parts of the essentially cancel each other inductor coils. They are among themselves arranged inductor coils flow in opposite directions from the feeding current. Still is to shield the interfering field of the lower inductor coil between the two inductor coils a suitable ferrite element is arranged.
  • DE 196 04 436 A1 describes an inductor for installation under a trough plate known with an inductor coil, which is held on a plastic carrier part.
  • the Inductor coil is with thermal and / or electrical insulation and one of the Well plate electrically insulated temperature sensor for measuring a well plate temperature fitted.
  • the self-supporting inductor coil is made of fine wire strand as a spiral essentially wound on a support surface of the carrier part.
  • the object of the present invention is to provide an inductor with the lowest possible minimum height to provide.
  • the material of the substrate is advantageously an oxide ceramic, in particular aluminum oxide. This makes it an excellent insulator with good thermal conduction properties for provided the inductor. Due to this property, the self-heating of the Coil and by the external heat supplied, for example the pot or the glass ceramic, caused local heating of the inductor distributed faster. In addition, the heat released to the environment over a larger area. This is particularly due to the arrangement the conductor tracks of the inductor coil, which is characterized in that the flat conductor track with its large surface from the substrate or the neighboring turns is directed away. Only the small-area side surfaces of adjacent turns are arranged next to each other.
  • Oxide ceramics are also particularly suitable for applying flat conductor tracks.
  • the thickness of the substrate is only about 0.7 to 1 mm.
  • the inductor coil is an inductor spiral in particular with a coating technique, especially thick-film technology, on the Substrate applied.
  • a coating technique especially thick-film technology
  • the inductor coil with sufficient in a technically simple manner Conductor cross section realizable.
  • PCB etching techniques could also be used, for example or mechanically manufactured ribbon reels or other known manufacturing techniques become. Because of the local use of printing or etching techniques firm connection of the conductor track on the ceramic substrate with its small Thermal expansion coefficients are the performance differences of the coil that due to the different geometric shape in the cold or hot state of the inductor extremely small.
  • Layer thicknesses in the range of approximately 0.5 mm are particularly desirable. These are manufacturing technology still well representable and on the other hand big enough to be suitable To be able to guarantee the quality of the inductor coil. Because of the good electrical material Conduction properties are particularly suitable for copper.
  • the substrate has plated-through holes for the electrically conductive connection of the two inductor coils Openings on. This is simple in terms of production technology and also makes it possible, if necessary numerous coil segments on the top and bottom of the substrate in Series and / or in parallel in the desired manner to electrically interconnect.
  • the spiral-shaped conductor track is an inductor coil essentially spatially in the spiral area between each Arranged turns of the conductor track of the other inductor.
  • the defined offset between the top and bottom surfaces of the inductor covered with metal especially possible with known coating or etching techniques.
  • the two inductor coils are essentially geometrically identical and arranged essentially one above the other. Furthermore, they are in the same direction flowed through electrical current in order to create the strongest possible field of the inductor coil for the heating process of the bottom of a saucepan placed on the hob can.
  • the construction of the inductor is particularly compact and simple to manufacture the hob manageable if the two inductor coils are arranged together on both sides Insulation washers and ferrite elements are prefabricated into a flat unit as a module.
  • a hob has a glass ceramic plate 1, below that in the area marked Cooking area an inductor 3 is supported. This has a circular surface coated on both sides Substrate plate 5 made of aluminum oxide with a thickness of about 0.8 mm. While on the top of the substrate plate 5 in thick-film technology, a first spiral copper inductor 7 is applied, the underside of the ceramic substrate plate 5 with a also spiral-shaped second inductor 9 coated from copper material.
  • the substrate plate has the electrically conductive connection of the two inductor coils 7, 9 in their center 5 about a hole at its center, which acts as an electrically conductive via 11 is formed.
  • the distance between the turns of flat copper conductor tracks 13 of the two spiral inductor coils 7, 9 are not uniform over the entire area of the Inductor coils 7, 9 selected. On the one hand, this makes it possible to control the heat distribution in the To influence inductor 3 or the substrate plate 5 in a targeted manner, and on the other hand, the through the inductor coils 7, 9 generated field distribution can be set specifically. For further The conductor tracks reduce the self-heating of the coils 7, 9 and the substrate plate 5 13 of the two inductor coils 7, 9 are partially offset.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Coils Or Transformers For Communication (AREA)
  • General Induction Heating (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Electrotherapy Devices (AREA)

Abstract

The inductor comprises at least two inductor coils (7,9) which are arranged on top of each other at a distance, whereby the coils are formed as flat conductor paths (13) layered on opposite sides of a plate-like substrate (5). A ceramic oxide, especially aluminum oxide, is used as the material of the substrate, having a thickness of approximately 0.7 to 1 mm. An Independent claim is provided for a corresponding cooking field utilizing the inductor.

Description

Die vorliegende Erfindung betrifft einen Induktor zur Anordnung unterhalb einer Kochfeldplatte eines Induktions-Kochfeldes mit zumindest zwei Induktorspulen, die übereinander voneinander beabstandet angeordnet sind.The present invention relates to an inductor for arrangement below a cooktop an induction hob with at least two inductor coils, one above the other are arranged at a distance.

Ein derartiger Induktor ist bekannt aus der Druckschrift WO 89/04109, wobei die Gestaltung und Anordnung der Induktorspulen derart ist, daß sich in jedem Feldpunkt außerhalb des zu erwärmenden Kochbereiches, der durch den abgestellten Topf bedeckt ist, die Feldanteile der einzelnen Induktorspulen im wesentlichen gegenseitig aufheben. Dazu sind die untereinander angeordneten Induktorspulen gegensinnig vom speisenden Strom durchflossen. Weiterhin ist zur Abschirmung des störenden Feldes der unteren Induktorspule zwischen den beiden Induktorspulen ein geeignetes Ferritelement angeordnet.Such an inductor is known from the publication WO 89/04109, the design and the arrangement of the inductor coils is such that each field point is outside the one to be heated Cooking area, which is covered by the placed pot, the field parts of the essentially cancel each other inductor coils. They are among themselves arranged inductor coils flow in opposite directions from the feeding current. Still is to shield the interfering field of the lower inductor coil between the two inductor coils a suitable ferrite element is arranged.

Weiterhin ist aus der Druckschrift DE 196 04 436 A1 ein Induktor zum Einbau unter einer Muldenplatte mit einer Induktorspule bekannt, die auf einem Kunststoff-Trägerteil gehaltert ist. Die Induktorspule ist mit einer thermischen und/oder elektrischen Isolation und einem von der Muldenplatte elektrisch isolierten Temperaturfühler zum Messen einer Muldenplatten-Temperatur ausgestattet. Dabei ist die selbsttragende Induktorspule aus feindrahtiger Litze als Spirale im wesentlichen auf einer Auflagefläche des Trägerteils gewickelt.Furthermore, DE 196 04 436 A1 describes an inductor for installation under a trough plate known with an inductor coil, which is held on a plastic carrier part. The Inductor coil is with thermal and / or electrical insulation and one of the Well plate electrically insulated temperature sensor for measuring a well plate temperature fitted. The self-supporting inductor coil is made of fine wire strand as a spiral essentially wound on a support surface of the carrier part.

Aufgabe der vorliegenden Erfindung ist es, einen Induktor mit möglichst geringer Mindestbauhöhe bereitzustellen. The object of the present invention is to provide an inductor with the lowest possible minimum height to provide.

Erfindungsgemäß ist dies bei einem Induktor nach dem Oberbegriff des Patentanspruches 1 dadurch erreicht, daß die Induktorspulen als flache Leiterbahnen auf gegenüberliegenden Seiten eines flachen, plattenförmigen Substrates aufgebracht sind. Durch die Abkehr von der Verwendung der bisher üblichen gewickelten Litzen, Drähte oder Kupferbänder als Induktorspule kann annähernd eine Halbierung der Aufbauhöhe des Induktors bei annähernd unveränderter lateraler Ausdehnung des Induktors erreicht werden. Um einen ausreichenden Leiterquerschnitt der Induktorspule bereitstellen zu können, sind zumindest zwei Induktorspulen übereinander angeordnet. Das durch die stromdurchflossenen Induktorspulen hervorgerufene elektromagnetische Feld zum Erwärmen eines auf der Kochfeldplatte abgestellten Topfes ist dabei ausreichend groß, wenn die beiden Induktorspulen möglichst gering beabstandet vom Topfboden angeordnet sind.This is according to the invention for an inductor according to the preamble of patent claim 1 thereby achieved that the inductor coils as flat conductor tracks on opposite sides a flat, plate-shaped substrate are applied. By moving away from use the previously used wound strands, wires or copper strips as an inductor coil can approximately halve the construction height of the inductor with almost unchanged lateral expansion of the inductor can be achieved. A sufficient conductor cross-section To be able to provide the inductor coil, at least two inductor coils are one above the other arranged. The electromagnetic caused by the current-carrying inductor coils The area for heating a pot placed on the hob is sufficient large if the two inductor coils are spaced as small as possible from the bottom of the pot are arranged.

Vorteilhafter Weise ist das Material des Substrates eine Oxydkeramik, insbesondere Aluminiumoxyd. Dadurch ist ein hervorragender Isolator mit guten Wärmeleitungseigenschaften für den Induktor bereitgestellt. Aufgrund dieser Eigenschaft wird die durch die Eigenerwärmung der Spule und durch die zugeführte Fremdwärme, beispielsweise des Topfes oder der Glaskeramik, verursachte lokale Aufheizung des Induktors schneller verteilt. Zudem wird die Wärme über eine größere Fläche an die Umgebung abgegeben. Dies ist insbesondere durch die Anordnung der Leiterbahnen der Induktorspule bedingt, die sich dadurch auszeichnet, daß die flache Leiterbahn mit ihrer großflächigen Oberseite vom Substrat bzw. den Nachbarwindungen weg gerichtet angeordnet ist. Lediglich die kleinflächigen Seitenflächen benachbarter Windungen sind einander benachbart angeordnet.The material of the substrate is advantageously an oxide ceramic, in particular aluminum oxide. This makes it an excellent insulator with good thermal conduction properties for provided the inductor. Due to this property, the self-heating of the Coil and by the external heat supplied, for example the pot or the glass ceramic, caused local heating of the inductor distributed faster. In addition, the heat released to the environment over a larger area. This is particularly due to the arrangement the conductor tracks of the inductor coil, which is characterized in that the flat conductor track with its large surface from the substrate or the neighboring turns is directed away. Only the small-area side surfaces of adjacent turns are arranged next to each other.

Weiterhin eignet sich eine Oxydkeramik besonders zum Aufbringen von flachen Leiterbahnen. Um einerseits eine ausreichende Stabilität des Induktors bzw. des Substrates gewährleisten zu können, und um andererseits das Feld der auf der Unterseite des Substrates aufgebrachten Induktorspule durch deren Beabstandung vom zu beheizenden Topf nicht zu stark zu schwächen, beträgt die Stärke des Substrates etwa lediglich 0,7 bis 1 mm.Oxide ceramics are also particularly suitable for applying flat conductor tracks. In order on the one hand to ensure sufficient stability of the inductor or of the substrate can, and on the other hand the field of applied to the underside of the substrate Inductor coil not too much due to its spacing from the pot to be heated weaken, the thickness of the substrate is only about 0.7 to 1 mm.

Gemäß einer bevorzugten Ausführungsform ist die Induktorspule als Induktorspirale insbesondere mit einer Beschichtungstechnik, insbesondere der Dickschichttechnik, auf das Substrat aufgebracht. Mit der Dickschichttechnik, insbesondere mit einer Mehrlagendickschichttechnik ist auf fertigungstechnisch einfache Weise die Induktorspule mit ausreichendem Leiterquerschnitt realisierbar. Alternativ könnten auch beispielsweise Leiterplatten-Ätztechniken oder mechanisch gefertigte Flachbandspulen oder andere bekannte Herstellungstechniken verwendet werden. Aufgrund der bei der Verwendung von Druck- oder Ätztechniken örtlich besonders festen Anbindung der Leiterbahn auf dem keramischen Substrat mit dessen geringen Temperaturlängenausdehnungskoeffizienten sind die Leistungsunterschiede der Spule, die durch die unterschiedliche geometrische Gestalt in kaltem oder heißem Zustand des Induktors hervorgerufen werden, außerordentlich gering.According to a preferred embodiment, the inductor coil is an inductor spiral in particular with a coating technique, especially thick-film technology, on the Substrate applied. With the thick-film technology, especially with a multi-layer thick-film technology is the inductor coil with sufficient in a technically simple manner Conductor cross section realizable. Alternatively, PCB etching techniques could also be used, for example or mechanically manufactured ribbon reels or other known manufacturing techniques become. Because of the local use of printing or etching techniques firm connection of the conductor track on the ceramic substrate with its small Thermal expansion coefficients are the performance differences of the coil that due to the different geometric shape in the cold or hot state of the inductor extremely small.

Wünschenswert sind insbesondere Schichtdicken im Bereich von etwa 0,5 mm. Diese sind fertigungstechnisch noch gut darstellbar und zum anderen ausreichend groß, um eine geeeignete Güte der Induktorspule gewährleisten zu können. Als Material ist wegen der guten elektrischen Leitungseigenschaften insbesondere Kupfer gut geeignet.Layer thicknesses in the range of approximately 0.5 mm are particularly desirable. These are manufacturing technology still well representable and on the other hand big enough to be suitable To be able to guarantee the quality of the inductor coil. Because of the good electrical material Conduction properties are particularly suitable for copper.

Insbesondere durch die Verwendung von Beschichtungs- oder Ätztechniken ist es fertigungstechnisch einfach möglich, daß der Abstand der Windungen der Leiterbahn der spiralförmigen Induktorspule von deren Mittelpunkt zum Randbereich variiert. Durch diese flexible Gestaltung der Abstände ist eine gezielte Feldverteilung bzw. Wärmeverteilung des Induktors möglich. Weiterhin lassen sich bei der Verwendung von Beschichtungs- oder Ätztechniken auf kostengünstige Weise an sich bekannte Mehrzoneninduktoren oder segmentierte Induktorspulen mit einer optimierten Wärmeverteilung realisieren. Hinzu kommt, daß die geringen Fertigungstoleranzen derartiger Herstellungsverfahren geringe Unterschiede bzgl. der Spuleneigenschaften, beispielsweise der Induktivität, der in Massenfertigung hergestellten Induktoren garantieren.In particular through the use of coating or etching techniques, it is manufacturing technology simply possible that the distance of the turns of the conductor track of the spiral Inductor coil varies from the center to the edge area. This flexible design of the distances, a specific field distribution or heat distribution of the inductor is possible. Furthermore, when using coating or etching techniques, cost-effective Well-known multi-zone inductors or segmented inductor coils an optimized heat distribution. In addition, the small manufacturing tolerances Such manufacturing processes have slight differences in terms of the coil properties, for example the inductance, which guarantee mass-produced inductors.

Zur elektrisch leitenden Verbindung der beiden Induktorspulen weist das Substrat durchkontaktierte Öffnungen auf. Dies ist fertigungstechnisch einfach und ermöglicht es auch, gegebenenfalls zahlreich vorhandene Spulensegmente auf der Ober- und der Unterseite des Substrates in Serien und/oder in Parallelschaltung in gewünschter Weise miteinander zu elektrisch verschalten.The substrate has plated-through holes for the electrically conductive connection of the two inductor coils Openings on. This is simple in terms of production technology and also makes it possible, if necessary numerous coil segments on the top and bottom of the substrate in Series and / or in parallel in the desired manner to electrically interconnect.

Um die Selbstaufheizung des Induktors zu reduzieren, ist die spiralförmige Leiterbahn einer Induktorspule im wesentlichen räumlich in dem spiralförmigen Bereich zwischen den einzelnen Windungen der Leiterbahn der anderen Induktorspule angeordnet. Der definierte Versatz zwischen der oberen und unteren mit Metall bedeckten Fläche der Induktorspule ist insbesondere mit an sich bekannten Beschichtungs- oder Ätztechniken problemlos möglich. Vorteilhafterweise sind die beiden Induktorspulen im wesentlichen geometrisch gleich ausgebildet und im wesentlichen übereinander angeordnet. Weiterhin sind sie gleichsinnig vom elektrischen Strom durchflossen, um ein möglichst starkes Feld der Induktorspule für den Erwärmungsprozess des Bodens eines auf dem Kochfeld abgestellten Topfes bereitstellen zu können.In order to reduce the self-heating of the inductor, the spiral-shaped conductor track is an inductor coil essentially spatially in the spiral area between each Arranged turns of the conductor track of the other inductor. The defined offset between the top and bottom surfaces of the inductor covered with metal especially possible with known coating or etching techniques. Advantageously, the two inductor coils are essentially geometrically identical and arranged essentially one above the other. Furthermore, they are in the same direction flowed through electrical current in order to create the strongest possible field of the inductor coil for the heating process of the bottom of a saucepan placed on the hob can.

Der Aufbau des Induktors ist besonders kompakt und in der Fertigung des Kochfeldes einfach handhabbar, wenn die beiden Induktorspulen zusammen mit beidseitig angeordneten Isolationsscheiben und Ferritelementen zu einer flachen Baueinheit als Modul vorgefertigt sind.The construction of the inductor is particularly compact and simple to manufacture the hob manageable if the two inductor coils are arranged together on both sides Insulation washers and ferrite elements are prefabricated into a flat unit as a module.

Nachfolgend ist anhand schematischer Darstellungen ein Ausführungsbeispiel des erfindungsgemäßen Induktors beschrieben.Below is an embodiment of the invention based on schematic representations Inductor described.

Es zeigen:

Fig. 1
in einer Seitenansicht, zum Teil in einer Schnittdarstellung den unter einer Kochfeldplatte angeordneten Induktor und
Fig. 2
das Detail X aus Figur 1 in vergrößertem Maßstab.
Show it:
Fig. 1
in a side view, partly in a sectional view of the inductor arranged under a hob and
Fig. 2
the detail X from Figure 1 on an enlarged scale.

Ein Kochfeld weist eine Glaskeramikplatte 1 auf, unterhalb der im Bereich einer markierten Kochstelle ein Induktor 3 gehaltert ist. Dieser weist eine beidseitig beschichtete, kreisflächenförmige Substratplatte 5 aus Aluminiumoxyd mit einer Stärke von etwa 0,8 mm auf. Während auf die Oberseite der Substratplatte 5 in Dickschichttechnik eine erste spiralförmige Kupfer-Induktorspule 7 aufgebracht ist, ist die Unterseite der keramischen Substratplatte 5 mit einer ebenfalls spiralförmig ausgebildeten zweiten Induktorspule 9 aus Kupfermaterial beschichtet. Zur elektrisch leitenden Verbindung der beiden Induktorspulen 7, 9 in ihrer Mitte weist die Substratplatte 5 etwa in ihrem Mittelpunkt eine Bohrung auf, die als elektrisch leitende Durchkontaktierung 11 ausgebildet ist. Der Abstand der Windungen von flachen Kupferleiterbahnen 13 der beiden spiralförmigen Induktorspulen 7, 9 sind nicht einheitlich über die gesamte Fläche der Induktorspulen 7, 9 gewählt. Dadurch ist es zum einen möglich, die Wärmeverteilung im Induktor 3 bzw. der Substratplatte 5 gezielt zu beeinflussen, und andererseits kann die durch die Induktorspulen 7, 9 erzeugte Feldverteilung gezielt eingestellt werden. Zur weiteren Verringerung der Eigenerwärmung der Spulen 7, 9 bzw. der Substratplatte 5 sind die Leiterbahnen 13 der beiden Induktorspulen 7, 9 zum Teil versetzt angeordnet. Durch die annähernd identische Spiralform der beiden Spulen 7, 9, durch die annähernd exakte Übereinanderanordnung der beiden Induktorspulen 7, 9 und insbesondere durch das gleichsinnige Fließen des Speisestroms durch die Induktorspulen 7, 9 ist bei flachem Induktoraufbau und üblicher lateraler Ausdehnung des Induktors 3 ein ausreichend starkes Feld des Induktors 3 gewährleistet. Auf die Ober- und Unterseite des Induktors 3 ist jeweils eine etwa 0,5 mm dicke Mikanitscheibe 15 als elektrische Isolation aufgeklebt. Weiterhin sind auf die Unterseite des Induktors 3 auf die Mikanitscheibe 15 mittels temperaturbeständigem Silikonkleber 19 zur zusätzlichen Leitung des Induktionsfeldes an sich bekannte Ferritstäbe 17 elastisch aufgeklebt. Der sich dadurch ergebende Induktoraufbau besitzt bei ausreichenden elektrischen Eigenschaften insgesamt lediglich eine Höhe von etwa 5 bis 6 mm.A hob has a glass ceramic plate 1, below that in the area marked Cooking area an inductor 3 is supported. This has a circular surface coated on both sides Substrate plate 5 made of aluminum oxide with a thickness of about 0.8 mm. While on the top of the substrate plate 5 in thick-film technology, a first spiral copper inductor 7 is applied, the underside of the ceramic substrate plate 5 with a also spiral-shaped second inductor 9 coated from copper material. The substrate plate has the electrically conductive connection of the two inductor coils 7, 9 in their center 5 about a hole at its center, which acts as an electrically conductive via 11 is formed. The distance between the turns of flat copper conductor tracks 13 of the two spiral inductor coils 7, 9 are not uniform over the entire area of the Inductor coils 7, 9 selected. On the one hand, this makes it possible to control the heat distribution in the To influence inductor 3 or the substrate plate 5 in a targeted manner, and on the other hand, the through the inductor coils 7, 9 generated field distribution can be set specifically. For further The conductor tracks reduce the self-heating of the coils 7, 9 and the substrate plate 5 13 of the two inductor coils 7, 9 are partially offset. By the approximately identical spiral shape of the two coils 7, 9, due to the almost exact stacking of the two inductor coils 7, 9 and in particular by flowing in the same direction of the feed current through the inductor coils 7, 9 is more common with a flat inductor structure lateral expansion of the inductor 3 ensures a sufficiently strong field of the inductor 3. On the top and bottom of the inductor 3 is about 0.5 mm thick Micanite disc 15 glued on as electrical insulation. Furthermore, the bottom of the Inductor 3 on the micanite disc 15 by means of temperature-resistant silicone adhesive 19 additional line of the induction field known ferrite rods 17 elastically glued. The resulting inductor structure has sufficient electrical properties overall only a height of about 5 to 6 mm.

Claims (10)

Induktor zur Anordnung unterhalb einer Kochfeldplatte eines Induktions-Kochfeldes mit zumindest zwei Induktorspulen, die übereinander voneinander beabstandet angeordnet sind, dadurch gekennzeichnet, daß die Induktorspulen (7, 9) als flache Leiterbahnen (13) auf gegenüberliegenden Seiten eines plattenförmigen Substrates (5) aufgebracht sind.Inductor for arrangement below a hob plate of an induction hob with at least two inductor coils which are arranged at a distance from one another, characterized in that the inductor coils (7, 9) are applied as flat conductor tracks (13) on opposite sides of a plate-shaped substrate (5) . Induktor nach Anspruch 1, dadurch gekennzeichnet, daß das Material des Substrates (5) eine Oxydkeramik, insbesondere Aluminiumoxyd ist.Inductor according to Claim 1, characterized in that the material of the substrate (5) is an oxide ceramic, in particular aluminum oxide. Induktor nach Anspruch 2, dadurch gekennzeichnet, daß die Stärke des Substrates (5) etwa 0,7 bis 1 mm beträgt.Inductor according to Claim 2, characterized in that the thickness of the substrate (5) is approximately 0.7 to 1 mm. Induktor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Induktorspule (7, 9) als Induktorspirale mit einer Beschichtungstechnik, insbesondere der Dickschichttechnik, auf das Substrat (5) aufgebracht ist.Inductor according to one of the preceding claims, characterized in that the inductor coil (7, 9) is applied to the substrate (5) as an inductor spiral using a coating technique, in particular thick-film technique . Induktor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Abstand der Windungen der Leiterbahn (13) der spiralförmigen Induktorspule (7, 9) von deren Mittelpunkt zum Randbereich variiert.Inductor according to one of the preceding claims, characterized in that the distance between the turns of the conductor track (13) of the spiral-shaped inductor coil (7, 9) varies from its center to the edge region. Induktor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Substrat (5) eine durchkontaktierte Öffnung (11) aufweist, die die beiden Induktorspulen (7, 9) leitend miteinander verbindet.Inductor according to one of the preceding claims, characterized in that the substrate (5) has a plated-through hole (11) which conductively connects the two inductor coils (7, 9) to one another. Induktor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die spiralförmige Leiterbahn (13) der einen Induktorspule (7) im wesentlichen räumlich in dem spiralförmigen Bereich zwischen den einzelnen Windungen der Leiterbahn der anderen Induktorspule (9) angeordnet ist. Inductor according to one of the preceding claims, characterized in that the spiral conductor track (13) of one inductor coil (7) is arranged essentially spatially in the spiral region between the individual turns of the conductor track of the other inductor coil (9). Induktor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die beiden Induktorspulen (7, 9) im wesentlichen geometrisch gleich ausgebildet sind, im wesentlichen exakt übereinander angeordnet sind und gleichsinnig vom elektrischen Strom durchflossen sind.Inductor according to one of the preceding claims, characterized in that the two inductor coils (7, 9) are of essentially the same geometrical design, are arranged essentially exactly one above the other and the electrical current flows through them in the same direction. Induktor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die beiden Induktorspulen (7, 9) zusammen mit beidseitig angeordneten Isolationsscheiben (15) und Ferritelementen (17) eine flache Baueinheit (3) bilden.Inductor according to one of the preceding claims, characterized in that the two inductor coils (7, 9) together with insulation disks (15) and ferrite elements (17) arranged on both sides form a flat structural unit (3). Kochfeld mit einer Kochfeldplatte, unterhalb der ein Induktor nach einem der Ansprüche 1 bis 9 angeordnet ist.Hob with a hob, below which an inductor according to one of the Claims 1 to 9 is arranged.
EP99119127A 1998-10-05 1999-10-05 Inductor for induction-cooktop Expired - Lifetime EP0993233B1 (en)

Applications Claiming Priority (2)

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DE19845844 1998-10-05
DE19845844A DE19845844A1 (en) 1998-10-05 1998-10-05 Inductor for an induction hob

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EP0993233A2 true EP0993233A2 (en) 2000-04-12
EP0993233A3 EP0993233A3 (en) 2005-08-17
EP0993233B1 EP0993233B1 (en) 2008-01-02

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EP (1) EP0993233B1 (en)
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Also Published As

Publication number Publication date
ATE383058T1 (en) 2008-01-15
EP0993233B1 (en) 2008-01-02
DE59914595D1 (en) 2008-02-14
US6144019A (en) 2000-11-07
DE19845844A1 (en) 2000-04-06
EP0993233A3 (en) 2005-08-17

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