EP4207945A1 - Induktionskochgerät - Google Patents

Induktionskochgerät Download PDF

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Publication number
EP4207945A1
EP4207945A1 EP22307047.5A EP22307047A EP4207945A1 EP 4207945 A1 EP4207945 A1 EP 4207945A1 EP 22307047 A EP22307047 A EP 22307047A EP 4207945 A1 EP4207945 A1 EP 4207945A1
Authority
EP
European Patent Office
Prior art keywords
inductors
cooking appliance
alternating current
induction cooking
subset
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.)
Pending
Application number
EP22307047.5A
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English (en)
French (fr)
Inventor
Xavier André
Cédric GOUMY
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
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Groupe Brandt SAS
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Filing date
Publication date
Application filed by Groupe Brandt SAS filed Critical Groupe Brandt SAS
Publication of EP4207945A1 publication Critical patent/EP4207945A1/de
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • 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

Definitions

  • the present invention relates to an induction cooking appliance.
  • the present invention applies generally to tables or induction cookers, in particular for domestic use.
  • the invention relates to an induction cooking appliance comprising several inductors external to each other and arranged according to a two-dimensional distribution in a cooking surface of the induction cooking appliance.
  • induction cooking appliances which provide a cooking surface without heating zone or predefined cooking zone. The user can thus place a cooking container at any location on the cooking surface.
  • the detection of the inductors covered by the cooking receptacle makes it possible to form, on a case-by-case basis, a heating zone associated with the receptacle and bringing together the inductors covered by the cooking receptacle.
  • Each inductor is thus independent and can be controlled in operation independently of the other inductors of the matrix induction table.
  • the inductors forming the cooking zone are controlled in operation to heat the cooking receptacle according to a power setpoint assigned by the user to the cooking receptacle.
  • each inductor is powered by its own alternating current generator, each alternating current generator comprising an inverter, that is to say a power electronic device making it possible to generate the current alternating from a direct source of electrical energy.
  • Each alternating current generator can be formed of an inverter comprising a single switch of the IGBT (Insulated Gate Bipolar Transistor) type, called inverter single-IGBT, or two IGBT-type switches mounted in a half-bridge topology.
  • IGBT Insulated Gate Bipolar Transistor
  • a control in operation of the various alternating current generators associated with the inductors forming the cooking zone thus makes it possible to simultaneously supply the inductors forming the cooking zone. All the inductors of the cooking zone are thus implemented simultaneously, making it possible to obtain a high heating power for the cooking receptacle.
  • this arrangement has the drawback of implementing as many inverters as inductors.
  • a matrix induction hob which can typically comprise about twenty inductors distributed in the cooking surface, the cost generated by the association of an inverter with each inductor is not negligible.
  • Matrix hobs are also known in which each alternating current generator supplies a subset of at least two inductors of the set of inductors arranged in the hob, each alternating current generator being itself connected to a phase of a power supply network.
  • the alternating current generator In order to supply alternating current to the subset of at least two inductors, the alternating current generator is controlled so as to supply one or the other of the inductors of the subset. When only one of the inductors of the subassembly is covered by a cooking vessel, the alternating current generator is driven to supply this single inductor continuously.
  • the alternating current generator is controlled to supply these two or more inductors alternately.
  • the available power delivered by the alternating current generator is then shared over the two or more inductors, the average power delivered by each inductor thus being lower than if it were supplied continuously by the alternating current generator.
  • the alternating current generator comprises a relay mounted at the output of an inverter to alternately supply the two or more inductors of the sub-assembly, a state change noise of such a relay is also perceptible during the operation of the induction cooker.
  • the object of the present invention is to solve at least one of the aforementioned drawbacks and to propose an induction cooking appliance making it possible to improve the average power delivered by each inductor in a heating zone bringing together inductors under a cooking vessel.
  • the present invention relates to an induction cooking appliance, comprising a set of N inductors external to each other and arranged according to a two-dimensional distribution in a cooking surface of said induction cooking appliance, and a set of n generators alternating current, each alternating current generator respectively supplying a subset of at least two inductors of said set of N inductors.
  • two inductors of a said first subset are separated by at least one inductor of a said second subset in said two-dimensional distribution.
  • a cooking receptacle covers adjacent inductors, which are powered by different alternating current generators from each other.
  • the inductors thus brought together in a heating zone and covered by the same container can be supplied continuously by an alternating current generator.
  • the average power delivered by each inductor corresponds to the power which can be delivered by the associated alternating current generator, the power not being shared between two or more inductors of the subassembly powered by the same alternating current generator. It is thus possible to have more power available for the same container.
  • said two inductors of said first subset are separated by several inductors belonging respectively to several different subsets of said first subset.
  • said n alternating current generators are adapted to be connected to the same phase of an electrical power supply network.
  • said inductors are arranged in a matrix arrangement in the cooking surface of said induction cooking appliance and said at least two inductors of a subset of said set of N inductors are non-adjacent in matrix layout.
  • This specific matrix arrangement makes it possible to separate the inductors of the same subset from each other.
  • the inductors are circumscribed in a quadrilateral having sides of length between 50 and 150 mm.
  • Such containers when they are placed on the hob, have a bottom which covers 4, 9 or 16 adjacent inductors in the hob, for example.
  • the inductors are circumscribed in a square having side lengths of between 50 and 150 mm, and preferably between 80 and 120 mm, and preferably substantially equal to 100 mm.
  • inductors are oval, circular, square, or rectangular in shape.
  • each alternating current generator comprises a frequency-controlled inverter for generating an alternating current supplying respectively a subset of at least two inductors of said set of N inductors.
  • each alternating current generator comprises an inverter and a relay mounted at the output of said inverter adapted to be driven by control means of said induction cooking appliance to alternately supply an inductor of said subset of at least two inductors powered by said alternating current generator.
  • the inverter comprises a single switch of the IGBT (Insulated Gate Bipolar Transistor) type or two switches of the IGBT type mounted according to a half-bridge topology.
  • IGBT Insulated Gate Bipolar Transistor
  • each alternating current generator comprises three switches of the IGBT type, a first switch and a second switch being mounted according to a half-bridge topology to form a first inverter suitable for supplying a first inductor of said subassembly at least two inductors powered by said alternating current generator, and said second switch and a third switch being mounted according to a half-bridge topology to form a second inverter suitable for supplying a second inductor of said subset of at least two inductors supplied by said alternating current generator, the induction cooking appliance comprising control means adapted to control said three IGBT-type switches to alternately supply said first and second inductors respectively by said first and second inverters.
  • the induction cooking appliance 10 is typically an induction hob for domestic use or for professional use.
  • It comprises a cooking surface 11, formed for example of a glass-ceramic plate, under which are arranged inductors Ix, Ix'.
  • the inductors Ix, Ix' are external to each other and arranged according to a two-dimensional distribution. The inductors Ix, Ix' are thus distributed in the hob 11.
  • such an induction cooking appliance there is no predefined cooking zone in the cooking surface 11, that is to say there are no predetermined locations to form a heating zone. of a container.
  • each heating zone is created on a case-by-case basis, depending on the positioning of a container on the cooking surface 11.
  • such an induction cooking appliance 10 is configured to detect the presence of a container in line with a group of adjacent inductors, regardless of the location of the container on the cooking surface 11.
  • Such an induction cooking appliance without a predefined cooking zone is known to those skilled in the art and its operation based on the detection of inductors covered by a container does not need to be described in more detail here.
  • the induction cooking appliance 10 comprises N inductors Ix, Ix', N being equal to 20.
  • the number of inductors is only an example and the number N of inductors can typically be between 8 and 40, and preferably between 16 and 30.
  • the inductors are all identical in shape, and here are circular (or disc-shaped).
  • the inductors Ix, Ix' are arranged in 4 rows and 5 columns.
  • the lines are parallel to a front edge 11a of the hob 11 intended to form a front edge of the induction cooking appliance, facing the user during operation of the induction cooking appliance 10.
  • the columns are perpendicular to the lines and to the front edge 11a of the hob 11.
  • the induction cooking appliance 10 comprises a set of n alternating current generators Gx, n being equal to 10.
  • each alternating current generator Gx respectively supplies a subset of two inductors Ix, Ix'.
  • the number n of alternating current generators Gx is equal to half the number N of inductors.
  • each alternating current generator could supply 3 or 4 inductors.
  • n alternating current generators Gx are adapted to be connected to the electrical power supply network.
  • the n alternating current generators are connected in half to one of the phases of the power supply network.
  • the latter can conventionally be a three-phase 50Hz electrical network.
  • n/2 alternating current generators Gx associated with a first group of inductors Ix, Ix' (with x between 1 and 5), contiguous in the hob 11, are connected to a same first phase of the power supply network
  • n/2 alternating current generators Gx associated with a second group of inductors Ix, Ix' (with x between 6 and 10), contiguous in the hob 11, are connected to a same second phase of the power supply network.
  • the first group of inductors Ix, Ix' (with x between 1 and 5) and the second group of inductors Ix, Ix' (with x between 6 and 10) thus form a partition of the inductors in the hob .
  • the n alternating current generators Gx can be connected to a single phase of the electrical power supply network.
  • the n alternating current generators Gx comprise a frequency-controlled inverter to generate an alternating current supplying inductors Ix, Ix'.
  • the n alternating current generators Gx are identical in the induction cooking appliance and the assembly described below for an alternating current generator Gx suitable for supplying current to two inductors Ix, Ix' is repeated at identical n times in the induction cooker.
  • the alternating current generator Gx comprises an inverter T1, D1, T2, D2 and a relay Kx mounted at the output of the inverter.
  • the relay Kx is controlled by control means 20 of the induction cooking appliance 10 to alternately supply one or the other of the two inductors Ix, Ix' supplied by the same current generator. alternative Gx.
  • the inverter comprises, in a manner known to those skilled in the art, two switches T1, T2 of the IGBT type (acronym of the Anglo-Saxon term Insulated Gate Bipolar Transistor for insulated gate bipolar transistors) associated with diodes D1, D2 and mounted in a half-bridge topology.
  • IGBT Insulated Gate Bipolar Transistor for insulated gate bipolar transistors
  • the control means 20 are adapted, also in a manner known to those skilled in the art, to control the inverter by control signals Com1, Com2 addressed respectively to the switches T1, T2.
  • the control signals Com1, Com2 are determined according to the setpoint power which must be delivered by the inductor Ix, Ix' supplied by the inverter.
  • control means control the relay Kx to supply alternately, preferably cyclically over a succession of periods of time, the two inverters Ix, Ix'.
  • the average power which can be delivered by the alternating current generator Gx is distributed between the two inductors Ix, Ix'.
  • the inverter T1, D1, T2, D2 described above implementing a half-bridge topology is only one example of an alternating current generator Gx.
  • the inverter could also be formed from a single IGBT type switch coupled to a diode, the output of the inverter being as previously connected alternately, via a relay, to one or the other of the two inductors Ix, Ix '.
  • the average power which can be delivered by such an inverter is distributed between the two inductors Ix, Ix' .
  • a first switch T1 and a second switch T2 are mounted according to a half-bridge topology to form a first inverter suitable for supplying a first inductor Ix.
  • the second switch T2 and a third switch T3 are mounted according to a half-bridge topology to form a second inverter suitable for supplying the second inductor Ix'.
  • Control means 30 are adapted to control the three switches T1, T2, T3 to alternately supply the first and second inductors Ix, Ix' respectively by the first and second inverters.
  • the control means 30 are thus suitable for controlling the first inverter T1, D11, T2, D12, and the second inverter T2, D12, T3, D13 by control signals Com1, Com2, Com3 addressed respectively to the switches T1, T2, T3.
  • control signals Com1, Com2, Com3 make it possible to drive the inductors Ix, Ix' alternately.
  • the inductor Ix is supplied with alternating current at the operating frequency and the current in the inductor Ix' is zero.
  • control signals Com2 and Com3 are activated in frequency (according to an operating frequency determined according to the setpoint power assigned to the inductor to be supplied with current) and in phase opposition, and the Com1 command is a continuous signal, the two switches T2 and T3 switch at the operating frequency, and the switch T1 is in the ON state.
  • the inductor Ix' is supplied with alternating current at the operating frequency and the current in the inductor Ix is zero.
  • the switches T1, T2, T3 are IGBT components.
  • other power components could be implemented such as Thyristors, field effect transistors of the MOSFET type (acronym of the Anglo-Saxon term Metal Oxide Semiconductor Field Effect Transistor).
  • the distribution of the inductors Ix, Ix' in the hob 11 is such that two inductors Ix, Ix' of a first subset, supplied by the same alternating current generator Gx, are separated by at least one inductor of a second subset, powered by another alternating current generator.
  • the inductors I1, I1' are separated by an inductor I2.
  • the inductors I2, I2' are separated by an inductor 11'.
  • the two inductors Ix, Ix' of the same sub-assembly, powered by the same alternating current generator Gx, are non-adjacent in the matrix arrangement of the hob 11.
  • the inductors Ix, Ix', powered by the same alternating current generator Gx are no longer immediately adjacent in the matrix arrangement.
  • the two inductors Ix, Ix' of the same subset could be separated by several inductors belonging respectively to several other subsets, different from the first subset.
  • n is 2 and m is 0.
  • n is 2 and m is 0.
  • n is 2 and m is 0.
  • n is 2 and m is 0.
  • m is 0.
  • the value of n can be equal to or less than the number of rows divided by two.
  • the value of m can be equal to or less than the number of columns divided by two.
  • a container 12 when a container 12 is placed on the cooking surface 11, it covers a group of adjacent inductors Ix: the inductors Ix, Ix' of the same subset being remote in the cooking surface and not adjacent, they are more rarely covered by the same container 12. This avoids the setting simultaneous operation of the inductors Ix, Ix' belonging to the same sub-assembly and therefore powered by the same alternating current generator Gx.
  • the power available at the alternating current generator Gx is not shared between the two inductors Ix, Ix'. This optimizes the average power which can be delivered by an inductor Ix to the container 12 covering this inductor Ix.
  • the inductors Ix, Ix' are circumscribed in a quadrilateral having sides of length between 50 and 150 mm.
  • This dimension is well suited to the use of the induction cooking appliance with usual domestic cooking receptacles, such as frying pans, saucepans, etc., the diameter of which is between 90 mm and 280 mm.
  • a container 12 of medium size substantially covers 4 adjacent inductors in the cooking surface 11. According to the arrangement of the inductors described above, the risk of covering two inductors Ix, Ix' supplied by the same alternating current generator Gx, and therefore distant from each other, is therefore limited.
  • the inductors Ix, Ix' are all identical and disc-shaped. They are circumscribed for example in a square having sides of length between 50 and 150 mm, and preferably between 80 and 120 mm, and preferably substantially equal to 100 mm.
  • the shape of the inductors Ix, Ix' can be different from a circular shape, and in particular square, rectangular or oval.
  • the other inductor Ix' of the same subassembly occupies a position I in row and J+2 in column.
  • the other inductor Ix' of the same subset occupies a position I+1 in line and J+2 in column.
  • the other inductor Ix' of the same subset generally occupies a position I+1 in row and J+2 modulo 5 in column.
  • the two-dimensional distribution of the inductors in the cooking surface 11 is not limited to a row and column matrix layout.
  • the inductors can be arranged in a staggered matrix arrangement.
  • the induction cooking appliance comprises in a non-limiting way N inductors, N being equal to 24.
  • the inductors Ix, Ix' are aligned in a column in a direction perpendicular to a front edge 11a of the cooking surface 11, intended to face the user in the operating position of the induction cooking appliance 10.
  • the inductors are offset and not aligned in a direction parallel to the front edge 11a of the hob 11, corresponding to the width of the hob 10.
  • the inductors Ix, Ix', aligned in a column are also arranged along a broken line (illustrated in dashed lines in figure 5 ) passing through the centers of the inductors in the width of the hob 10, the distribution of the inductors as described above with reference to the figure 1 And 4 can be applied in a similar way.
  • a first inductor Ix of a subset occupies a position I along a broken line and a position J in a column
  • the second inductor Ix' of this same subset occupies a position I + n according to a broken line and a position J + m in column in the matrix arrangement, n and/or m being different from 1.
  • a container 12 placed on the cooking surface 11 preferably covers inductors Ix belonging to different sub-assemblies, supplied respectively by different alternating current generators Gx.
  • the simultaneous use of two or more inductors Ix, Ix' supplied by the same alternating current generator Gx is limited, and therefore a sharing of the available power delivered by this alternating current generator Gx.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
EP22307047.5A 2021-12-30 2022-12-27 Induktionskochgerät Pending EP4207945A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2114680A FR3131676A1 (fr) 2021-12-30 2021-12-30 Appareil de cuisson à induction

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Publication Number Publication Date
EP4207945A1 true EP4207945A1 (de) 2023-07-05

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EP22307047.5A Pending EP4207945A1 (de) 2021-12-30 2022-12-27 Induktionskochgerät

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FR (1) FR3131676A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110147375A1 (en) * 2009-12-23 2011-06-23 Lomp Stephane Inductors on balanced phases
US9060389B2 (en) * 2010-02-10 2015-06-16 Samsung Electronics Co., Ltd. Induction heating cooker
US20190254125A1 (en) * 2016-09-02 2019-08-15 Electrolux Appliances Aktiebolag Induction cooking hob and method for controlling a cooking zone

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110147375A1 (en) * 2009-12-23 2011-06-23 Lomp Stephane Inductors on balanced phases
US9060389B2 (en) * 2010-02-10 2015-06-16 Samsung Electronics Co., Ltd. Induction heating cooker
US20190254125A1 (en) * 2016-09-02 2019-08-15 Electrolux Appliances Aktiebolag Induction cooking hob and method for controlling a cooking zone

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Publication number Publication date
FR3131676A1 (fr) 2023-07-07

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