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)

Applications Claiming Priority (2)

Publications (2)

Family

ID=36999768

Family Applications (1)

Country Status (5)

Families Citing this family (25)

Family Cites Families (22)

• 2005
  • 2005-12-27 FR FR0513362A patent/FR2895639B1/fr not_active Expired - Fee Related
• 2006
  • 2006-12-22 US US12/159,208 patent/US8912473B2/en active Active
  • 2006-12-22 EP EP06847123.4A patent/EP1967044B1/de active Active
  • 2006-12-22 WO PCT/FR2006/002853 patent/WO2007074233A2/fr not_active Ceased
  • 2006-12-22 ES ES06847123T patent/ES2707790T3/es active Active

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events