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EP1967044A2 - Variable-size induction heating plate - Google Patents

Variable-size induction heating plate

Info

Publication number
EP1967044A2
EP1967044A2 EP06847123A EP06847123A EP1967044A2 EP 1967044 A2 EP1967044 A2 EP 1967044A2 EP 06847123 A EP06847123 A EP 06847123A EP 06847123 A EP06847123 A EP 06847123A EP 1967044 A2 EP1967044 A2 EP 1967044A2
Authority
EP
European Patent Office
Prior art keywords
coils
assembly
cooking
assemblies
container
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
EP06847123A
Other languages
German (de)
French (fr)
Other versions
EP1967044B1 (en
Inventor
Alain Roux
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.)
Groupe Brandt SAS
Original Assignee
FagorBrandt SAS
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 FagorBrandt SAS filed Critical FagorBrandt SAS
Publication of EP1967044A2 publication Critical patent/EP1967044A2/en
Application granted granted Critical
Publication of EP1967044B1 publication Critical patent/EP1967044B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the present invention relates to an induction cooker of variable size, and an induction cooktop incorporating such a hearth.
  • an induction cooking hearth generally consists of a circular winding adapted to the size of a cooking vessel of given size.
  • It may also consist of several concentric coils to adapt to the different diameters of the containers arranged on the hob above the fireplace.
  • a cooking hearth may also consist of several coils arranged side by side and supplied by independent generators as described in patent application FR 2 758 994.
  • Hobs are also known comprising several small coils arranged in a hob.
  • a hob is described in particular in document FR 2 863 039.
  • This document describes a set of circular coils arranged side by side so as to cover the entire surface of the hob.
  • the coils are magnetically independent and are controlled independently so that each cooking focus is determined case by case, depending on the position of the container on the cooking surface, vis-à-vis -vis reels.
  • the power delivered by the inductor depends on the electromagnetic adaptation between the inductor and the container disposed above.
  • the container is considered as a resistive load by the current generator supplying the inductor.
  • the induction heaters are designed such that the electromagnetic adaptation is optimal and the power delivered is maximum when the container completely covers the surface of the inductor.
  • the present invention aims to solve the aforementioned drawbacks and to provide a cooking induction cooking of variable size to ensure a high power delivered to a container regardless of its size.
  • the present invention relates to a variable size induction cooking furnace comprising at least two assemblies of several coils arranged side by side in a plane, each assembly of several coils being adapted to form a cooking chamber.
  • the firing chamber comprises control means adapted, on the one hand, to independently control said assemblies in operation, and on the other hand to control said assemblies in synchronous operation, each assembly being powered by a single current generator.
  • the induction cooking stove has the advantage of being able to function as two independent cooking heaters of medium size or as a single larger sized hearth.
  • the recovery rate of the surface of the inductor coils is very important, when a container is placed above the two assemblies.
  • the assemblies comprise an identical number of coils.
  • the coils of each assembly are tangent to a circle corresponding to the dimension of the cooking zone associated with this assembly, well suited to the circular shape of a conventional cooking vessel.
  • each assembly comprises at least three coils equidistant from each other, to distribute well in the plane of the cooking chamber the surface covered by the inductor coils arranged facing the bottom of a container.
  • the cooking chamber comprises two assemblies, each assembly comprising at least three coils equidistant from each other, at least two coils of a first assembly being arranged facing each other or at least two coils of a second assembly.
  • This arrangement provides a wider cooking focus at its center, well suited to heat larger containers when the coil assemblies operate in synchronized mode.
  • the surface of the inductors covered by a container placed in the center of the two assemblies is greater than 50% with a container of such size that it completely covers an assembly of inductor coils.
  • the bottom surface of a container placed next to the coils of an assembly represents at least 70% of the total surface of the bottom of the container.
  • the coils of each assembly are tangent to an ellipse corresponding to the size of a single large size cooking chamber.
  • the present invention also relates to an induction hob, comprising a cooking stove according to the invention.
  • This cooktop has features and benefits similar to those previously described in connection with the cooking stove. Other features and advantages of the invention will become apparent in the description below.
  • FIG. 1 is a schematic diagram illustrating an induction cooking hearth according to an embodiment of the present invention
  • FIG. 2 is a diagram illustrating a coil assembly of the cooking chamber of Figure 1;
  • FIG. 3 is a diagram illustrating the operation in two independent homes of the cooking chamber of Figure 1;
  • FIG. 4 is a diagram illustrating the operation in a single focus of the cooking chamber of Figure 1;
  • FIGS. 5 and 6 are diagrams illustrating induction cooking hobs in accordance with other embodiments of the invention.
  • the cooking chamber comprises two assemblies 10, 10 'of several coils 10a, 10b, 10c, 10'a, 10'b and 10'c, all deposited in a plane parallel to the cooking surface.
  • each assembly 10, 10 ' comprises three coils arranged in a triangle, so that each assembly 10, 10' comprises coils equidistant from each other.
  • each assembly 10, 10 'of three coils is inscribed in a circle, as illustrated in FIG. 2, so as to constitute a disk-shaped cooking space particularly well adapted to the shape of a cooking vessel. .
  • the coils are disk-shaped and tangent to the circle defining the cooking zone.
  • Each coil consists of an electrically conductive winding.
  • each coil may consist of a spiral flat winding of a multi-strand strand of copper wires.
  • each coil is non-parallel to the electrically conductive windings of neighboring coils.
  • the natural magnetic coupling between two neighboring coils is virtually zero.
  • the two coil assemblies are arranged side by side in a plane parallel to the cooking plane and are inscribed substantially in an oval or elliptical shape.
  • each assembly 10, 10 ' comprises two coils 10a, 10b and 10'a, 10'b disposed facing each other and equidistant from each other.
  • each assembly 10, 10 ' is powered by a single high-frequency alternating current generator 11, 11' conventionally used to supply induction heating coils.
  • the three coils of each assembly 10, 10 ' are electrically connected in series or in parallel with each generator 11, 11'.
  • each assembly 10, 10 ' is electrically connected in series with each generator 11, 11'.
  • each generator 11, 11' is electrically connected in series with each generator 11, 11'.
  • Control means 12, 12 make it possible to operate in two configurations.
  • the control means 12, 12' are adapted to independently control the operation of each generator 11, 11 ', thereby ensuring the operation of the two cooking stoves independently.
  • each inductor coil 10a, 10b, 10c, 10'a, 10'b, 10'c is equal to about 100 mm.
  • Each assembly 10, 10 'of three coils arranged in a triangle is then inscribed in a circle of about 200 mm, which corresponds to a focus of medium size.
  • the juxtaposition of the two assemblies 10, 10 'in two opposite triangular arrangements allows for a cooking zone of about 200 mm wide and 400 mm long.
  • the cooking stove of variable size thus offers the possibility of using two cooking hobs independent of each other, each consisting of three coils of each assembly 10, 10 ', a middle center circular hearth consisting of four coils 10a, 10b, 10'a, 10'b controlled synchronously, or a large elliptical focus consisting of six coils 10a, 10b, 10c, 10'a, 10'b, 10'c, controlled synchronously .
  • variable size cooking hearth allows on the one hand to accept one or two small containers, of the order of 12 to 20 cm in diameter, arranged side by side, and on the other hand to receive a container of medium size, of the order of 25 cm in diameter, or even a large oval container, up to 40 cm long.
  • a medium-sized container disposed in the center of the cooking chamber is adapted to cover about 60% of the surface of the inductor coils.
  • the induction cooking stove according to the invention makes it possible to optimize the area covered by the inductors by a container of any size, and thus to guarantee a high operating power in the various cases of use of the fireplace. cooking. Furthermore, it is important that the total area covered by the inductor coils disposed under the bottom of the container is the largest possible to ensure a good temperature distribution in the container. By using small elementary coils, it is possible to better distribute the surface of the coils arranged vis-à-vis the bottom of the container, and thus ensure a good distribution of the heating of the container.
  • the recovery rate of the bottom of the container by the inductor coils is greater than 70% .
  • each assembly of the variable size cooking stove is not limited.
  • each assembly 10, 10 comprises, respectively, five coils 10a-10e, 10'a-10'e.
  • each assembly 10 includes, respectively, five coils 10a-10e, 10'a-10'e.
  • each assembly 10, 10 ' comprises three coils 10a, 10b, 10c and
  • each assembly 10, 10 ' comprises six coils 10a-10f, 10'a-10'f.
  • the coils are staggered and form a base triangle consisting of three coils 10a, 10b, 10c and 10'a,
  • the cooking chamber could comprise assemblies of coils different from each other. Furthermore, the cooking chamber could comprise a greater number of coil assemblies, and for example three assemblies.
  • the shape of the coils is not limited to one form of disc, but may be different and for example oval or other.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • General Induction Heating (AREA)

Abstract

The invention relates to a variable-size induction heating plate comprising a plurality of windings (10a, 10b, 10c, 10'a, 10'b, 10'c) arranged in a cooking surface. Said heating plate comprises two sets (10, 10') of a plurality of windings arranged side-by-side, each set (10, 10') of windings being adapted in such a way as to form a heating plate, and control means (12, 12', 13) which are adapted in such a way as to control the operation of the sets (10, 10') both in an independent manner and a synchronous manner. Each set of windings is fed by a single current generator (11, 11 ). The inventive heating plate can be used in an induction cooking surface.

Description

Foyer de cuisson par induction de taille variable Induction cooking stove with variable size

La présente invention concerne un foyer de cuisson par induction de taille variable, ainsi qu'une table de cuisson par induction intégrant un tel foyer.The present invention relates to an induction cooker of variable size, and an induction cooktop incorporating such a hearth.

De manière générale, la présente invention s'applique au domaine des appareils de cuisson domestiques par induction, tels que des tables vitrocéramiques par induction. Un foyer de cuisson par induction est généralement constitué d'un bobinage circulaire adapté à la dimension d'un récipient de cuisson de taille donnée.In general, the present invention applies to the field of domestic cooking appliances by induction, such as induction glass-ceramic tables. An induction cooking hearth generally consists of a circular winding adapted to the size of a cooking vessel of given size.

Il peut également être constitué de plusieurs bobines concentriques permettant de s'adapter aux différents diamètres des récipients disposés sur le plan de cuisson au-dessus du foyer.It may also consist of several concentric coils to adapt to the different diameters of the containers arranged on the hob above the fireplace.

Un foyer de cuisson peut également être constitué de plusieurs bobines disposées côte à côte et alimentées par des générateurs indépendants comme décrit dans la demande de brevet FR 2 758 994.A cooking hearth may also consist of several coils arranged side by side and supplied by independent generators as described in patent application FR 2 758 994.

On connaît également des tables de cuisson comprenant plusieurs bobines de petite taille disposées dans un plan de cuisson. Une telle table de cuisson est décrite notamment dans le document FR 2 863 039. Ce document décrit un ensemble de bobines circulaires disposées côte à côte de façon à couvrir l'ensemble de la surface du plan de cuisson. Dans ce mode d'assemblage, les bobines sont magnétiquement indépendantes et sont commandées de manière indépendante de telle sorte que chaque foyer de cuisson est déterminé au cas par cas, en fonction de la position du récipient sur le plan de cuisson, en vis-à-vis des bobines.Hobs are also known comprising several small coils arranged in a hob. Such a hob is described in particular in document FR 2 863 039. This document describes a set of circular coils arranged side by side so as to cover the entire surface of the hob. In this method of assembly, the coils are magnetically independent and are controlled independently so that each cooking focus is determined case by case, depending on the position of the container on the cooking surface, vis-à-vis -vis reels.

Toutefois, en fonction de la position du récipient sur le plan de cuisson, il n'est pas rare qu'une proportion importante d'un groupe de bobines ne soit pas recouverte par le récipient, de telle sorte que la puissance délivrée par l'inducteur est faible. En effet, la puissance délivrée par un foyer de cuisson déterminé dépend de l'adaptation électromagnétique entre l'inducteur et le récipient disposé au-dessus. Le récipient est considéré comme une charge résistive par le générateur de courant alimentant l'inducteur. En principe, les dispositifs de chauffage par induction sont conçus de telle sorte que l'adaptation électromagnétique est optimale et la puissance délivrée est maximale lorsque le récipient recouvre complètement la surface de l'inducteur.However, depending on the position of the container on the hob, it is not uncommon for a large proportion of a group of coils is not covered by the container, so that the power delivered by the inductor is weak. Indeed, the power delivered by a determined cooking point depends on the electromagnetic adaptation between the inductor and the container disposed above. The container is considered as a resistive load by the current generator supplying the inductor. In principle, the induction heaters are designed such that the electromagnetic adaptation is optimal and the power delivered is maximum when the container completely covers the surface of the inductor.

La présente invention a pour but de résoudre les inconvénients précités et de proposer un foyer de cuisson par induction de taille variable permettant de garantir une puissance élevée délivrée à un récipient quelle que soit sa taille.The present invention aims to solve the aforementioned drawbacks and to provide a cooking induction cooking of variable size to ensure a high power delivered to a container regardless of its size.

À cet effet la présente invention concerne un foyer de cuisson par induction de taille variable comprenant au moins deux assemblages de plusieurs bobines disposés côte à côte dans un plan, chaque assemblage de plusieurs bobines étant adapté à constituer un foyer de cuisson.To this end, the present invention relates to a variable size induction cooking furnace comprising at least two assemblies of several coils arranged side by side in a plane, each assembly of several coils being adapted to form a cooking chamber.

Selon l'invention, le foyer de cuisson comprend des moyens de commande adaptés d'une part à commander indépendamment en fonctionnement lesdits assemblages, d'autre part à commander en fonctionnement synchrone lesdits assemblages, chaque assemblage étant alimenté par un unique générateur de courant.According to the invention, the firing chamber comprises control means adapted, on the one hand, to independently control said assemblies in operation, and on the other hand to control said assemblies in synchronous operation, each assembly being powered by a single current generator.

Ainsi, le foyer de cuisson par induction présente l'avantage de pouvoir fonctionner comme deux foyers de cuisson indépendants de taille moyenne ou comme un unique foyer de taille plus importante.Thus, the induction cooking stove has the advantage of being able to function as two independent cooking heaters of medium size or as a single larger sized hearth.

Grâce à l'utilisation de plusieurs bobines dans chaque assemblage constituant un foyer de cuisson, le taux de recouvrement de la surface des bobines inductrices est très important, lorsqu'un récipient est placé au-dessus des deux assemblages.Through the use of several coils in each assembly constituting a cooking hearth, the recovery rate of the surface of the inductor coils is very important, when a container is placed above the two assemblies.

Selon une caractéristique avantageuse de l'invention, les assemblages comportent un nombre identique de bobines. De préférence, les bobines de chaque assemblage sont tangentes à un cercle correspondant à la dimension du foyer de cuisson associé à cet assemblage, bien adapté à la forme circulaire d'un récipient de cuisson classique.According to an advantageous characteristic of the invention, the assemblies comprise an identical number of coils. Preferably, the coils of each assembly are tangent to a circle corresponding to the dimension of the cooking zone associated with this assembly, well suited to the circular shape of a conventional cooking vessel.

En outre, chaque assemblage comporte au moins trois bobines équidistantes les unes des autres, permettant de bien répartir dans le plan du foyer de cuisson la surface recouverte par les bobines inductrices disposées en regard du fond d'un récipient.In addition, each assembly comprises at least three coils equidistant from each other, to distribute well in the plane of the cooking chamber the surface covered by the inductor coils arranged facing the bottom of a container.

Grâce à cette disposition équidistante des bobines, le taux de recouvrement du fond d'un récipient placé au-dessus de trois bobines équidistantes est supérieur à 70%. Selon une réalisation, le foyer de cuisson comprend deux assemblages, chaque assemblage comportant au moins trois bobines équidistantes les unes des autres, au moins deux bobines d'un premier assemblage étant disposées en vis-à-vis respectivement d'au moins deux bobines d'un second assemblage. Cette disposition permet d'obtenir un foyer de cuisson plus large en son centre, bien adapté à chauffer des récipients de plus grande taille lorsque les assemblages de bobines fonctionnent en mode synchronisé.Thanks to this equidistant arrangement of the coils, the recovery rate of the bottom of a container placed above three equidistant coils is greater than 70%. According to one embodiment, the cooking chamber comprises two assemblies, each assembly comprising at least three coils equidistant from each other, at least two coils of a first assembly being arranged facing each other or at least two coils of a second assembly. This arrangement provides a wider cooking focus at its center, well suited to heat larger containers when the coil assemblies operate in synchronized mode.

En outre, la surface des inducteurs recouverts par un récipient placé au centre des deux assemblages est supérieure à 50% avec un récipient de taille telle qu'il recouvre complètement un assemblage de bobines inductrices. Par ailleurs, la surface du fond d'un récipient placé en regard des bobines d'un assemblage représente au moins 70% de la surface totale du fond du récipient. De préférence, les bobines de chaque assemblage sont tangentes à une ellipse correspondant à la dimension d'un unique foyer de cuisson de grande dimension.In addition, the surface of the inductors covered by a container placed in the center of the two assemblies is greater than 50% with a container of such size that it completely covers an assembly of inductor coils. Furthermore, the bottom surface of a container placed next to the coils of an assembly represents at least 70% of the total surface of the bottom of the container. Preferably, the coils of each assembly are tangent to an ellipse corresponding to the size of a single large size cooking chamber.

La présente invention concerne également une table de cuisson par induction, comprenant un foyer de cuisson conforme à l'invention.The present invention also relates to an induction hob, comprising a cooking stove according to the invention.

Cette table de cuisson présente des caractéristiques et avantages analogues à ceux décrits précédemment en relation avec le foyer de cuisson. D'autres particularités et avantages de l'invention apparaîtront encore dans la description ci-après.This cooktop has features and benefits similar to those previously described in connection with the cooking stove. Other features and advantages of the invention will become apparent in the description below.

Aux dessins annexés donnés à titre d'exemples non limitatifs : - la figure 1 est un schéma simplifié illustrant un foyer de cuisson par induction conforme à un mode de réalisation de la présente invention ;In the accompanying drawings given as non-limiting examples: - Figure 1 is a schematic diagram illustrating an induction cooking hearth according to an embodiment of the present invention;

- la figure 2 est un schéma illustrant un assemblage de bobines du foyer de cuisson de la figure 1 ; - la figure 3 est un schéma illustrant le fonctionnement en deux foyers indépendants du foyer de cuisson de la figure 1 ;- Figure 2 is a diagram illustrating a coil assembly of the cooking chamber of Figure 1; - Figure 3 is a diagram illustrating the operation in two independent homes of the cooking chamber of Figure 1;

- la figure 4 est un schéma illustrant le fonctionnement en un unique foyer du foyer de cuisson de la figure 1 ; et- Figure 4 is a diagram illustrating the operation in a single focus of the cooking chamber of Figure 1; and

- les figures 5 et 6 sont des schémas illustrant des foyers de cuisson par induction conformes à d'autres modes de réalisation de l'invention.FIGS. 5 and 6 are diagrams illustrating induction cooking hobs in accordance with other embodiments of the invention.

On va décrire à présent en référence aux figures 1 à 4, un exemple de réalisation d'un foyer de cuisson par induction conforme à l'invention.One embodiment of an induction cooking stove according to the invention will now be described with reference to FIGS. 1 to 4.

Dans ce mode de réalisation, le foyer de cuisson comprend deux assemblages 10, 10' de plusieurs bobines 10a, 10b, 10c, 10'a, 10'b et 10'c, toutes déposées dans un plan parallèle à la surface de cuisson.In this embodiment, the cooking chamber comprises two assemblies 10, 10 'of several coils 10a, 10b, 10c, 10'a, 10'b and 10'c, all deposited in a plane parallel to the cooking surface.

Comme bien illustré sur la figure 2, chaque assemblage 10, 10' comporte trois bobines disposées en triangle, de telle sorte que chaque assemblage 10, 10' comporte des bobines équidistantes les unes des autres.As well illustrated in Figure 2, each assembly 10, 10 'comprises three coils arranged in a triangle, so that each assembly 10, 10' comprises coils equidistant from each other.

Ainsi, chaque assemblage 10, 10' de trois bobines est inscrit dans un cercle, tel qu'illustré à la figure 2, de manière à constituer un foyer de cuisson en forme de disque particulièrement bien adapté à la forme d'un récipient de cuisson.Thus, each assembly 10, 10 'of three coils is inscribed in a circle, as illustrated in FIG. 2, so as to constitute a disk-shaped cooking space particularly well adapted to the shape of a cooking vessel. .

Dans ce mode de réalisation, les bobines sont en forme de disque et tangentes au cercle définissant le foyer de cuisson. Chaque bobine est constituée d'un enroulement conducteur électrique.In this embodiment, the coils are disk-shaped and tangent to the circle defining the cooking zone. Each coil consists of an electrically conductive winding.

En pratique chaque bobine peut être constituée d'un enroulement à plat, en spirale, d'un toron multibrin de fils de cuivre.In practice, each coil may consist of a spiral flat winding of a multi-strand strand of copper wires.

Les enroulements électriquement conducteurs de chaque bobine sont non parallèles aux enroulements électriquement conducteurs des bobines voisines. Ainsi, le couplage magnétique naturel entre deux bobines voisines est quasiment nul. Par ailleurs, les deux assemblages de bobines sont disposés côte à côte dans un plan parallèle au plan de cuisson et sont inscrits sensiblement dans une forme ovale ou elliptique.The electrically conductive windings of each coil are non-parallel to the electrically conductive windings of neighboring coils. Thus, the natural magnetic coupling between two neighboring coils is virtually zero. Furthermore, the two coil assemblies are arranged side by side in a plane parallel to the cooking plane and are inscribed substantially in an oval or elliptical shape.

En pratique, chaque assemblage 10, 10' comporte deux bobines 10a, 10b et 10'a, 10'b disposées en vis-à-vis et équidistantes les unes des autres.In practice, each assembly 10, 10 'comprises two coils 10a, 10b and 10'a, 10'b disposed facing each other and equidistant from each other.

Comme illustré à la figure 1, chaque assemblage 10, 10' est alimenté par un unique générateur 11 , 11' de courant alternatif haute fréquence utilisé de façon classique pour alimenter des bobines de chauffage par induction. Les trois bobines de chaque assemblage 10, 10' sont connectées électriquement en série ou en parallèle à chaque générateur 11, 11 '.As illustrated in FIG. 1, each assembly 10, 10 'is powered by a single high-frequency alternating current generator 11, 11' conventionally used to supply induction heating coils. The three coils of each assembly 10, 10 'are electrically connected in series or in parallel with each generator 11, 11'.

De préférence, les bobines de chaque assemblage 10, 10' sont connectées électriquement en série à chaque générateur 11 , 11'. Ainsi, contrairement à un montage parallèle, il est possible d'éviter la surchauffe d'une bobine qui ne serait pas recouverte par un récipient de petite taille placé sur l'assemblage.Preferably, the coils of each assembly 10, 10 'are electrically connected in series with each generator 11, 11'. Thus, unlike a parallel assembly, it is possible to avoid overheating of a coil that would not be covered by a small container placed on the assembly.

Des moyens de commande 12, 12' permettent d'assurer le fonctionnement selon deux configurations.Control means 12, 12 'make it possible to operate in two configurations.

Lorsque les foyers de cuisson constitués par chaque assemblage 10, 10' sont utilisés de manière indépendante, comme illustré par exemple à la figure 3, les moyens de commande 12, 12' sont adaptés à commander de façon indépendante le fonctionnement de chaque générateur 11 , 11', permettant ainsi d'assurer le fonctionnement des deux foyers de cuisson de manière indépendante. A contrario, lorsque le foyer de cuisson est utilisé comme un foyer unique pour chauffer un récipient de plus grande taille, tel qu'illustré à la figure 4, les moyens de commande 12, 12' sont adaptés à commander de façon synchrone, grâce à un module de synchronisation 13, le fonctionnement des générateurs 11 , 11' de manière à permettre le fonctionnement des six bobines 10a, 10b, 10c, 10'a, 10'b et 10'c de façon synchrone.When the cooking hobs constituted by each assembly 10, 10 'are used independently, as illustrated for example in FIG. 3, the control means 12, 12' are adapted to independently control the operation of each generator 11, 11 ', thereby ensuring the operation of the two cooking stoves independently. Conversely, when the cooking chamber is used as a single hearth for heating a larger container, as shown in Figure 4, the control means 12, 12 'are adapted to control synchronously, thanks to a synchronization module 13, the operation of the generators 11, 11 'so as to allow the operation of the six coils 10a, 10b, 10c, 10'a, 10'b and 10'c synchronously.

En pratique, et à titre d'exemple non limitatif, le diamètre de chaque bobine inductrice 10a, 10b, 10c, 10'a, 10'b, 10'c est égal à environ 100 mm. Chaque assemblage 10, 10' de trois bobines disposées en triangle est alors inscrit dans un cercle d'environ 200 mm, ce qui correspond à un foyer de taille moyenne.In practice, and by way of nonlimiting example, the diameter of each inductor coil 10a, 10b, 10c, 10'a, 10'b, 10'c is equal to about 100 mm. Each assembly 10, 10 'of three coils arranged in a triangle is then inscribed in a circle of about 200 mm, which corresponds to a focus of medium size.

La juxtaposition des deux assemblages 10, 10' selon deux agencements triangulaires opposés permet de réaliser une zone de cuisson d'environ 200 mm de large et 400 mm de longueur.The juxtaposition of the two assemblies 10, 10 'in two opposite triangular arrangements allows for a cooking zone of about 200 mm wide and 400 mm long.

Le foyer de cuisson de taille variable offre ainsi la possibilité d'utiliser deux foyers de cuisson indépendants l'un de l'autre constitués chacun par trois bobines de chaque assemblage 10, 10', un foyer circulaire central de taille moyenne constitué de quatre bobines 10a, 10b, 10'a, 10'b commandées de manière synchrone, ou encore un foyer elliptique de grande taille constitué des six bobines 10a, 10b, 10c, 10'a, 10'b, 10'c, commandées de manière synchrone.The cooking stove of variable size thus offers the possibility of using two cooking hobs independent of each other, each consisting of three coils of each assembly 10, 10 ', a middle center circular hearth consisting of four coils 10a, 10b, 10'a, 10'b controlled synchronously, or a large elliptical focus consisting of six coils 10a, 10b, 10c, 10'a, 10'b, 10'c, controlled synchronously .

Ainsi, un tel foyer de cuisson à taille variable permet d'une part d'accepter un ou deux récipients de petite taille, de l'ordre de 12 à 20 cm de diamètre, disposés côte à côte, et d'autre part de recevoir un récipient de taille moyenne, de l'ordre de 25 cm de diamètre, ou bien encore un récipient ovale de grande taille, pouvant atteindre 40 cm de long.Thus, such a variable size cooking hearth allows on the one hand to accept one or two small containers, of the order of 12 to 20 cm in diameter, arranged side by side, and on the other hand to receive a container of medium size, of the order of 25 cm in diameter, or even a large oval container, up to 40 cm long.

Comme bien illustré sur la figure 4, grâce à l'utilisation de bobines élémentaires dans chaque assemblage 10, 10', un récipient de taille moyenne disposé au centre du foyer de cuisson est adapté à recouvrir environ 60% de la surface des bobines inductrices.As well illustrated in Figure 4, through the use of elementary coils in each assembly 10, 10 ', a medium-sized container disposed in the center of the cooking chamber is adapted to cover about 60% of the surface of the inductor coils.

On notera que si chaque assemblage 10, 10' était remplacé par un unique inducteur circulaire de diamètre sensiblement égal à 200 mm, le même récipient ne recouvrirait qu'environ 40% de la surface des inducteurs.Note that if each assembly 10, 10 'was replaced by a single circular inductor of diameter substantially equal to 200 mm, the same container would cover only about 40% of the surface of the inductors.

Ainsi, le foyer de cuisson par induction conforme à l'invention permet d'optimiser la surface recouverte des inducteurs par un récipient quelle que soit sa taille, et ainsi de garantir une puissance élevée en fonctionnement dans les différents cas d'utilisation du foyer de cuisson. Par ailleurs, il est important que la surface totale couverte par les bobines inductrices disposées sous le fond du récipient soit la plus importante possible afin de garantir une bonne répartition de température dans le récipient. En utilisant des bobines élémentaires de petite taille, il est possible de mieux répartir la surface des bobines disposées en vis-à-vis du fond du récipient, et ainsi de garantir une bonne répartition du chauffage du récipient.Thus, the induction cooking stove according to the invention makes it possible to optimize the area covered by the inductors by a container of any size, and thus to guarantee a high operating power in the various cases of use of the fireplace. cooking. Furthermore, it is important that the total area covered by the inductor coils disposed under the bottom of the container is the largest possible to ensure a good temperature distribution in the container. By using small elementary coils, it is possible to better distribute the surface of the coils arranged vis-à-vis the bottom of the container, and thus ensure a good distribution of the heating of the container.

Ainsi, grâce à la disposition en triangle de trois bobines sous le fond d'un récipient dont le diamètre correspond sensiblement à la dimension du cercle tangent aux trois bobines, le taux de recouvrement du fond du récipient par les bobines inductrices est supérieur à 70%.Thus, thanks to the triangle arrangement of three coils under the bottom of a container whose diameter substantially corresponds to the dimension of the circle tangential to the three coils, the recovery rate of the bottom of the container by the inductor coils is greater than 70% .

Bien entendu, la forme et le nombre de bobines de chaque assemblage du foyer de cuisson à taille variable ne sont pas limités. On a illustré à titre d'exemples non limitatifs d'autres exemples de foyer de cuisson conformes à l'invention sur les figures 5 et 6, dans lesquels les bobines voisines de chaque assemblage sont également imbriquées et disposées en quinconce les unes par rapport aux autres.Of course, the shape and the number of coils of each assembly of the variable size cooking stove are not limited. Illustrative non-limiting examples of other examples of cooking hearth according to the invention in Figures 5 and 6, wherein the neighboring coils of each assembly are also interleaved and arranged in staggered relation to each other. other.

Ainsi, sur la figure 5, chaque assemblage 10, 10' comporte respectivement cinq bobines 10a-10e, 10'a-10'e. Dans chaque assemblage 10,Thus, in FIG. 5, each assembly 10, 10 'comprises, respectively, five coils 10a-10e, 10'a-10'e. In each assembly 10,

10', les bobines inductrices sont disposées en quinconce sur deux rangées. Par ailleurs, chaque assemblage 10, 10' comporte trois bobines 10a, 10b, 10c et10 ', the inductor coils are arranged in staggered rows. Moreover, each assembly 10, 10 'comprises three coils 10a, 10b, 10c and

10'a, 10'b, 10'c disposées en vis-à-vis et équidistantes les unes des autres.10'a, 10'b, 10'c disposed opposite and equidistant from each other.

Comme illustré à la figure 6, selon un autre mode de réalisation, chaque assemblage 10, 10' comporte six bobines 10a-IOf, 10'a-10'f. Dans chaque assemblage 10, 10', les bobines sont disposées en quinconce et forment un triangle de base constituée de trois bobines 10a, 10b, 10c et 10'a,As illustrated in Figure 6, according to another embodiment, each assembly 10, 10 'comprises six coils 10a-10f, 10'a-10'f. In each assembly 10, 10 ', the coils are staggered and form a base triangle consisting of three coils 10a, 10b, 10c and 10'a,

10'b, 10'c et comportant une unique bobine 10f, 10'f à son sommet.10'b, 10'c and having a single coil 10f, 10'f at its top.

On peut ainsi obtenir des foyers de tailles variables et de formes variables, par exemple ronde, ovale ou autres.It is thus possible to obtain foci of variable sizes and of variable shapes, for example round, oval or other.

On obtient ainsi un foyer de cuisson de taille variable permettant d'équiper une table de cuisson par induction présentant une grande flexibilité d'utilisation en fonction de la taille des récipients de cuisson.This gives a cooking stove of variable size to equip an induction cooktop with great flexibility of use depending on the size of the cooking vessels.

Bien entendu, la présente invention n'est pas limitée aux exemples de réalisation décrits précédemment.Of course, the present invention is not limited to the embodiments described above.

Ainsi, le foyer de cuisson pourrait comporter des assemblages de bobines différents les uns des autres. Par ailleurs, le foyer de cuisson pourrait comporter un nombre supérieur d'assemblages de bobines, et par exemple trois assemblages.Thus, the cooking chamber could comprise assemblies of coils different from each other. Furthermore, the cooking chamber could comprise a greater number of coil assemblies, and for example three assemblies.

Enfin, la forme des bobines n'est pas limitée à une forme de disque, mais peut être différente et par exemple ovale ou autre. Finally, the shape of the coils is not limited to one form of disc, but may be different and for example oval or other.

Claims

REVENDICATIONS 1. Foyer de cuisson par induction de taille variable comprenant au moins deux assemblages (10, 10') de plusieurs bobines (1 Oa-IOf, 10'a-10'f) disposés côte à côte dans un plan, chaque assemblage (10, 10') de plusieurs bobines étant adapté à constituer un foyer de cuisson caractérisé en ce qu'il comprend des moyens de commande (12, 12', 13) adaptés d'une part à commander indépendamment en fonctionnement lesdits assemblages, d'autre part à commander en fonctionnement synchrone lesdits assemblages (10, 10'), chaque assemblage (10, 10') de plusieurs bobines étant alimenté par un unique générateur de courant (11 , 11').An induction cooking stove of variable size comprising at least two assemblies (10, 10 ') of a plurality of coils (1 Oa-10f, 10'a-10'f) arranged side by side in a plane, each assembly (10 , 10 ') of several coils being adapted to constitute a cooking chamber characterized in that it comprises control means (12, 12', 13) adapted on the one hand to independently control in operation said assemblies, on the other hand part in order to control in synchronous operation said assemblies (10, 10 '), each assembly (10, 10') of several coils being fed by a single current generator (11, 11 '). 2. Foyer de cuisson conforme à la revendication 1 , caractérisé en ce que les bobines de chaque assemblage (10, 10') sont connectées électriquement en série avec ledit générateur de courant (11 , 11').2. Cooking hearth according to claim 1, characterized in that the coils of each assembly (10, 10 ') are electrically connected in series with said current generator (11, 11'). 3. Foyer de cuisson conforme à l'une des revendications 1 ou 2, caractérisé en ce que lesdits assemblages (10 ; 10') comportent un nombre identiques de bobines (1Oa-IOf1 10'a-10'f). 3. Cooking hearth according to one of claims 1 or 2, characterized in that said assemblies (10; 10 ') comprise an identical number of coils (10a-IOf 1 10'a-10'f). 4. Foyer de cuisson conforme à l'une des revendications 1 à 3, caractérisé en ce que les bobines de chaque assemblage (10 ; 10') sont tangentes à un cercle correspondant à la dimension dudit foyer de cuisson associé à chaque assemblage.4. Cooking hearth according to one of claims 1 to 3, characterized in that the coils of each assembly (10; 10 ') are tangent to a circle corresponding to the size of said cooking chamber associated with each assembly. 5. Foyer de cuisson conforme à l'une des revendications 1 à 4, caractérisé en ce que chaque assemblage (10 ; 10') comporte au moins trois bobines (10a, 10b, 10c ; 10'a, 10'b, 10'c) équidistantes les unes des autres.5. Cooking hearth according to one of claims 1 to 4, characterized in that each assembly (10; 10 ') comprises at least three coils (10a, 10b, 10c; 10'a, 10'b, 10'). c) equidistant from each other. 6. Foyer de cuisson conforme à l'une des revendications 1 à 5, caractérisé en ce qu'il comprend deux assemblages (10, 10'), chaque assemblage (10, 10') comportant au moins trois bobines (10a, 10b, 10c ; 10'a, 10'b, 10'c) équidistantes les unes des autres, au moins deux bobines (10a, 10b) d'un premier assemblage (10) étant disposées en vis-à-vis respectivement d'au moins deux bobines (10'a, 10'b) d'un second assemblage (10'). 6. Cooking hearth according to one of claims 1 to 5, characterized in that it comprises two assemblies (10, 10 '), each assembly (10, 10') comprising at least three coils (10a, 10b, 10c, 10'a, 10'b, 10'c) equidistant from each other, at least two coils (10a, 10b) of a first assembly (10) being arranged vis-à-vis respectively at least two coils (10'a, 10'b) of a second assembly (10 '). 7. Foyer de cuisson conforme à l'une des revendications 1 à 6, caractérisé en ce que les bobines de chaque assemblage (10 ; 10') sont tangentes à une ellipse correspondant à la dimension d'un unique foyer de cuisson de grande dimension.7. Cooking hearth according to one of claims 1 to 6, characterized in that the coils of each assembly (10; 10 ') are tangent to an ellipse corresponding to the size of a single large cooking chamber . 8. Table de cuisson par induction, caractérisée en ce qu'elle comprend un foyer de cuisson conforme à l'une des revendications 1 à 7. Induction hob, characterized in that it comprises a cooking hob according to one of claims 1 to 7.
EP06847123.4A 2005-12-27 2006-12-22 Variable-size induction heating plate Active EP1967044B1 (en)

Applications Claiming Priority (2)

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FR0513362A FR2895639B1 (en) 2005-12-27 2005-12-27 VARIABLE SIZE INDUCTION COOKING FIREPLACE
PCT/FR2006/002853 WO2007074233A2 (en) 2005-12-27 2006-12-22 Variable-size induction heating plate

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EP1967044B1 EP1967044B1 (en) 2018-11-14

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FR2895639A1 (en) 2007-06-29
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FR2895639B1 (en) 2008-02-29
WO2007074233A3 (en) 2007-09-07
WO2007074233A2 (en) 2007-07-05
ES2707790T3 (en) 2019-04-05
US8912473B2 (en) 2014-12-16

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