EP3595408A1 - Procédé pour faire fonctionner une table de cuisson à induction et table de cuisson à induction - Google Patents

Procédé pour faire fonctionner une table de cuisson à induction et table de cuisson à induction Download PDF

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Publication number
EP3595408A1
EP3595408A1 EP18182343.6A EP18182343A EP3595408A1 EP 3595408 A1 EP3595408 A1 EP 3595408A1 EP 18182343 A EP18182343 A EP 18182343A EP 3595408 A1 EP3595408 A1 EP 3595408A1
Authority
EP
European Patent Office
Prior art keywords
glass
conductive layer
group
ceramic element
induction
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.)
Withdrawn
Application number
EP18182343.6A
Other languages
German (de)
English (en)
Inventor
Adriano Scotto D'Apollonia
Luca PEGOLO
Matteo PAOLELLA
Laurent Jeanneteau
Alex Viroli
Filippo Milanesi
Daniele CASO
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.)
Electrolux Appliances AB
Original Assignee
Electrolux Appliances AB
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 Electrolux Appliances AB filed Critical Electrolux Appliances AB
Priority to EP18182343.6A priority Critical patent/EP3595408A1/fr
Priority to CN201910604147.4A priority patent/CN110708782A/zh
Publication of EP3595408A1 publication Critical patent/EP3595408A1/fr
Withdrawn legal-status Critical Current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
    • H05B6/1227—Cooking devices induction cooking plates or the like and devices to be used in combination with them for wok pans and wok pans supports for induction cooking plates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—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

Definitions

  • the present invention relates generally to the field of induction hobs.
  • Induction hobs for preparing food are well known in prior art.
  • Induction hobs typically comprise at least one induction coil placed below a glass or glass-ceramic element in order to provide heat to a piece of cookware.
  • Induction hobs which comprise means for reducing electrical charging of the piece of cookware placed above the glass or glass-ceramic element.
  • German Patent Application DE 10 2004 053 963 A1 discloses an induction-heated stove.
  • a glass-ceramic plate of said stove comprises an electrically conductive layer for reducing electrical charging of the piece of cookware.
  • the invention relates to an induction hob.
  • the induction hob comprises a glass or glass-ceramic element and an induction coil in order to provide a heating zone at said glass or glass-ceramic element.
  • Said glass or glass-ceramic element comprises at its lower surface a conductive layer or a group of conductive layers, said conductive layer or group of conductive layers being made of an electrically conductive material.
  • Said glass or glass-ceramic element comprises a concavely-shaped portion or recess below which said induction coil is arranged.
  • Said induction hob is advantageous because said conductive layer provided at the lower side of the glass or glass-ceramic element significantly reduces the electrical charging of the piece of cookware which comprise a convex lower portion, in order to be received in said concavely-shaped portion of said glass or glass-ceramic element.
  • said conductive layer or group of conductive layers is directly arranged at the lower surface of the glass or glass-ceramic element. So, in other words, there is no gap between the lower surface of the glass or glass-ceramic element and the conductive layer or group of conductive layers. Thereby the shielding effect is significantly improved.
  • said conductive layer or group of conductive layers comprise a central portion which is not covered by said electrically conductive material. Thereby the coil temperature is reduced during the cooking process.
  • said group of conductive layers comprises multiple conductive layer sections, said conductive layer sections being associated to a single induction coil in order to provide an electromagnetic shield to said induction coil.
  • Adjacent conductive layer sections may be at least partially separated by one or more gaps at which no electrically conductive material is provided. Thereby the coupling efficiency is enhanced and the quantity of conductive material can be reduced.
  • said conductive layer comprises a ring-like shape.
  • Said conductive ring-shaped layer may be centred with respect to the induction coil arranged below said conductive layer. Thereby, an integrally formed conductive layer with high shielding capabilities is obtained.
  • said group of conductive layers comprises multiple conductive layer sections, wherein longitudinal axes of said conductive layer sections are radially arranged with respect to a centre of the induction coil associated with said group of conductive layers. Said sectioned conductive layer can be manufactured with reduced technical effort.
  • said group of conductive layers comprises multiple concentrically arranged ring sections, wherein adjacent ring sections are separated from each other by ring-shaped or ring section-shaped areas which are not covered by said electrically conductive material.
  • Said segmented conductive layer comprising multiple concentric rings provides effective shielding capabilities.
  • said conductive layer or group of conductive layers is coupled to ground potential or earth connection of the induction hob, specifically, to the chassis of the induction hob.
  • the chassis provides a circular cut-out at its upper portion in which said glass or glass-ceramic element is inserted.
  • Said conductive layer or group of conductive layers is preferably coupled with ground by providing an electrical connection between the conductive layer or group of conductive layers and a portion of the chassis which is arranged in close proximity to said circular cut-out.
  • said electric coupling between said conductive layer or group of conductive layers and ground potential or earth connection of the induction hob is performed by means of electrically conductive brackets.
  • Said brackets provide an electrical coupling between the conductive layer or group of conductive layers and a portion of the chassis which is arranged next to said circular cut-out in which said glass or glass-ceramic element is inserted.
  • said metallic brackets are also used for mechanically coupling the glass or glass-ceramic element with the chassis.
  • the group of conductive layers are coupled between each other by means of bridging portions arranged at the lower surface of said glass or glass-ceramic element and made of electrically conductive material.
  • bridging portions By means of said bridging portions it is possible to electrically couple multiple conductive layer sections. Thereby, when coupling one conductive layer section with ground, all conductive layer sections are grounded via said bridging portions.
  • said electrically conductive material arranged at the lower surface of said glass or glass-ceramic element is an electrically conductive painting.
  • Said electrically conductive painting may digitally printed (e.g. ink-jet printing), sprayed or sputtered to said lower surface.
  • said electrically conductive material comprises or contains graphite or silver.
  • any conductive material can be used, for example copper, aluminium etc.
  • said conductive layer or said group of conductive layers at least partially extends at slanted side portions which laterally confine said concavely-shaped portion or recess of said glass or glass-ceramic element. More in detail, said conductive layer or said group of conductive layers is provided at side portions, which are in close proximity to the edge of the cut-out of the chassis in which said glass or glass-ceramic element is included. Thereby, an electrical coupling between the conductive layer or said group of conductive layers and the chassis can be obtained with reduced effort.
  • said conductive layer or said group of conductive layers is spatially associated to an area covered by said induction coil and an outer edge of said conductive layer or said group of conductive layers is adapted to the shape of the induction coil and surrounds the outer edge of the inductive coil at a certain radial distance.
  • Such arrangement of said conductive layer or said group of conductive layers achieves a sufficient shielding effect with reduced technical effort.
  • the invention relates to a method for reducing electrical charging of a piece of cookware arranged at an induction hob.
  • the induction hob comprises a glass or glass-ceramic element and an induction coil.
  • a conductive layer or a group of conductive layers is applied to a lower surface of said glass or glass-ceramic element, said conductive layer or group of conductive layers being made of an electrically conductive material.
  • Said electrical charging is reduced by said conductive layer or a group of conductive layers which is applied to a concavely-shaped section of said glass or glass-ceramic element below which said induction coil is arranged.
  • Fig. 1 discloses a schematic diagram of an induction hob 1.
  • the induction hob 1 comprises a chassis 1.1, in the following also referred to as housing.
  • a glass-ceramic element 2 is provided at the upper side of the external chassis 1.1 in order to provide a heating zone 4.
  • Below said glass-ceramic element 2, one or more induction coils 3 are provided.
  • the induction coil 3 is electrically coupled with a power circuit 8 which provides highfrequency electric power to the induction coil 3 in order to provide heat at a piece of cookware 7.
  • said power circuit 8 is adapted to provide electric power to a resonant circuit in which the induction coil 3 is included and which is electrically and/or magnetically coupled with the cookware 7.
  • the power circuit 8 comprises one or more switching elements. Said switching elements may be, for example, IGBTs and transistors of any constructive technology.
  • the glass-ceramic element 2 at least partially comprises a concavely-shaped portion thereby forming a recess which opens upwardly.
  • Said recess is adapted to receive a portion of a piece of cookware 7 which comprises a convexly-shaped lower portion.
  • Said piece of cookware 7 may be, for example, a wok or a wok-like pan.
  • the shape of the induction coil 3 corresponds to the shape of the glass-ceramic element 2.
  • the induction coil 3 may comprise a concave shape which is adapted to the concave shape of the glass-ceramic element 2.
  • the glass-ceramic element 2 comprises an electrically conductive layer 5.
  • conductive layer may refer to an integrally formed, contiguous layer or a group of conductive layers which are separated from each other or interconnected by bridging portions.
  • the electrically conductive layer 5 is arranged at the lower surface 2.2 of the glass-ceramic element 2, specifically, at the lower surface 2.2 of the concavely-shaped portion 2.1 of the glass-ceramic element 2. More in detail, the electrically conductive layer 5 is directly attached to said lower surface 2.2 of the glass-ceramic element 2.
  • the electrically conductive layer 5 comprises an electrically conductive material.
  • Said material may be applied as a painting to said glass-ceramic element 2, for example, by spraying, other printing techniques or thermal transfer techniques.
  • the electrically conductive material may be applied by a sputtering process or by adhering a metallic foil to the glass-ceramic element 2.
  • the electrically conductive layer 5 is electrically coupled with ground (earth potential). Said grounding may be achieved by coupling the electrically conductive layer 5 to the ground wire or earth connection.
  • said electrical connection between the electrically conductive layer 5 and ground is achieved by means of brackets 6, specifically electrically conductive brackets 6 (e.g. metallic brackets).
  • Said brackets 6 may be arranged between the glass-ceramic element 2 and the chassis 1.1 of the induction hob 1. More in detail, said brackets 6 may be arranged at a lower side of the glass-ceramic element 2 and may additionally provide a fixing of glass-ceramic element 2 at the chassis 1.1. Due to the coupling of the chassis 1.1 with ground, the electrically conductive layer 5 is connected via said brackets 6 and said chassis 1.1 to ground. However, it is worth mentioning that there are also other possibilities for coupling the electrically conductive layer 5 with ground.
  • the chassis 1.1 or a grounded chassis portion surrounds the glass-ceramic element 2.
  • the glass-ceramic element 2 is included in a recess or cut-out provided in the upper portion 1.1.1 of the chassis 1.1.
  • the chassis 1.1 may comprise an upper portion 1.1.1 which is not integrally formed with the glass-ceramic element 2.
  • said upper portion may be made of stainless steel.
  • Said upper portion 1.1.1 comprises a recess or cut-out in which said glass-ceramic element 2 is received.
  • At least the lower section of the upper portion 1.1.1 may be electrically conductive and grounded in order to enable a grounding of the electrically conductive layer 5 via said brackets 6.
  • the area, at which said electrically conductive layer 5 is provided, is essentially limited to the area below which the induction coil 3 is provided. More in detail, the electrically conductive layer 5 at least partially overlaps with the cross-sectional area of the induction coil 3 and extends laterally beyond said cross-sectional area.
  • the electrically conductive layer 5 is spatially associated with the cross-sectional area of the induction coil 3. More in detail, said electrically conductive layer 5 comprises an outer edge 5.4, wherein said outer edge 5.4 is adapted to the cross-sectional shape of the induction coil 3 and said outer edge 5.4 at least partially surrounds an outer edge of the induction coil 3 at a certain radial distance r. Thereby a well-confined electrically conductive layer 5 is provided which provides a sufficient shield for the piece of cookware 7 and which can be manufactured at reasonable costs.
  • said electrically conductive layer 5 is provided at one or more side portions 2.3 of the glass-ceramic element 2, said side portions 2.3 may be slanted with respect to the horizontal direction, respectively, slanted with respect to the tangential direction at the lowest section of the concavely-shaped portion 2.1.
  • no electrically conductive layer 5 is provided at the central portion of the glass-ceramic element 2 (which is the lowest portion of the concavely-shaped portion 2.1). So, in other words, the electrically conductive layer 5 may comprise at least a gap in an area directly above the centre 3.1 of the induction coil 3.
  • Fig. 2 to 4 show different configurations of said electrically conductive layer 5.
  • the outer edge of the induction coil 3 is indicated in said figures by means of a dashed circle.
  • the electrically conductive layer 5 is integrally formed and comprises a ring-like shape with a central gap.
  • the configurations in Fig. 2 and 4 comprise groups of conductive layers, i.e. multiple conductive layer sections 5.2 which are associated with a single induction coil 3.
  • the embodiment according to Fig. 2 comprises multiple conductive layer sections 5.2 comprising the shape of circle segments.
  • said conductive layer sections 5.2 may also have another shape, for example, a strip-like shape.
  • the longitudinal axes of said conductive layer sections 5.2 may be radially arranged with respect to the centre 3.1 of the induction coil 3.
  • the conductive layer sections 5.2 according to Fig. 4 comprise a ring-like shape and are arranged concentrically with respect to the centre 3.1 of the induction coil 3. Due to the different radii of the ring-shaped conductive layer sections 5.2, the conductive layer sections 5.2 are at least partially separated from each other by gaps which also have a ring-like or ring-section-like shape.
  • the conductive layer sections 5.2 can be coupled by bridging portions order to electrically couple said conductive layer sections 5.2 with each other. Thereby, by connecting one conductive layer section 5.2 with ground, all other conductive layer sections 5.2 are grounded, too.
  • the thickness and resistance of conductive layer may be chosen according to the given requirements, specifically based on the chosen conductive material.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
EP18182343.6A 2018-07-09 2018-07-09 Procédé pour faire fonctionner une table de cuisson à induction et table de cuisson à induction Withdrawn EP3595408A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18182343.6A EP3595408A1 (fr) 2018-07-09 2018-07-09 Procédé pour faire fonctionner une table de cuisson à induction et table de cuisson à induction
CN201910604147.4A CN110708782A (zh) 2018-07-09 2019-07-05 用于操作感应灶具的方法和感应灶具

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18182343.6A EP3595408A1 (fr) 2018-07-09 2018-07-09 Procédé pour faire fonctionner une table de cuisson à induction et table de cuisson à induction

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EP3595408A1 true EP3595408A1 (fr) 2020-01-15

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EP18182343.6A Withdrawn EP3595408A1 (fr) 2018-07-09 2018-07-09 Procédé pour faire fonctionner une table de cuisson à induction et table de cuisson à induction

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CN (1) CN110708782A (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2859013A1 (fr) * 2003-08-07 2005-02-25 Albert Thomann Dispositif chauffant par induction pour wok
JP3668260B2 (ja) * 1994-06-17 2005-07-06 株式会社フジマック 電磁誘導加熱における渦電流収束型加熱装置
DE102004053963A1 (de) 2004-11-09 2006-05-11 Schott Ag Induktiv beheiztes Kochfeld
JP2011258442A (ja) * 2010-06-10 2011-12-22 Toshiba Corp 誘導加熱調理器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3668260B2 (ja) * 1994-06-17 2005-07-06 株式会社フジマック 電磁誘導加熱における渦電流収束型加熱装置
FR2859013A1 (fr) * 2003-08-07 2005-02-25 Albert Thomann Dispositif chauffant par induction pour wok
DE102004053963A1 (de) 2004-11-09 2006-05-11 Schott Ag Induktiv beheiztes Kochfeld
JP2011258442A (ja) * 2010-06-10 2011-12-22 Toshiba Corp 誘導加熱調理器

Also Published As

Publication number Publication date
CN110708782A (zh) 2020-01-17

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