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EP1122983B2 - Appareil ménager de cuisson à induction - Google Patents

Appareil ménager de cuisson à induction Download PDF

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Publication number
EP1122983B2
EP1122983B2 EP01101019.6A EP01101019A EP1122983B2 EP 1122983 B2 EP1122983 B2 EP 1122983B2 EP 01101019 A EP01101019 A EP 01101019A EP 1122983 B2 EP1122983 B2 EP 1122983B2
Authority
EP
European Patent Office
Prior art keywords
induction coil
cooking device
support surface
cooking
support
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.)
Expired - Lifetime
Application number
EP01101019.6A
Other languages
German (de)
English (en)
Other versions
EP1122983A3 (fr
EP1122983A2 (fr
EP1122983B1 (fr
Inventor
Stefan Edenharter
Laurent Jeanneteau
Christian Eskildsen
Oerjan Lagercrantz
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 Schwanden AG
Electrolux Rothenburg GmbH Factory and Development
Electrolux Home Products Denmark AS
Electrolux France SAS
Original Assignee
Electrolux Schwanden AG
Electrolux Rothenburg GmbH Factory and Development
Electrolux Home Products Denmark AS
Electrolux France 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
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Priority claimed from DE10006863A external-priority patent/DE10006863C2/de
Application filed by Electrolux Schwanden AG, Electrolux Rothenburg GmbH Factory and Development, Electrolux Home Products Denmark AS, Electrolux France SAS filed Critical Electrolux Schwanden AG
Publication of EP1122983A2 publication Critical patent/EP1122983A2/fr
Publication of EP1122983A3 publication Critical patent/EP1122983A3/fr
Application granted granted Critical
Publication of EP1122983B1 publication Critical patent/EP1122983B1/fr
Publication of EP1122983B2 publication Critical patent/EP1122983B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—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
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/02—Induction heating
    • H05B2206/022—Special supports for the induction coils

Definitions

  • the invention relates to a cooking device.
  • cooking devices known with a cooktop plate with two or four cooking zones, in which below at least one of the cooking zones known by a generator high-frequency controllable induction coil for inductive heating of placed on the cooking zone cookware.
  • the induction coil is fixed on a metallic carrier device.
  • the invention has for its object to provide a special cooking device with induction heating.
  • the invention is based on the surprising observation, based on measurements, that during operation of the induction heating device, high-frequency interference currents may occur which exceed predetermined limit values according to the EN 55011 standard, when the carrier device is switched to constant electrical potential, in particular earthed.
  • the invention further proceeds from a conclusion deduced from the measurements that an excessively high electrical capacitance between the induction coil and the carrier device is responsible for the interference currents. Even with an electrical insulation of the induction coil of the support device, which at least largely prevents a direct charge flow, still made of induction coil and carrier capacitor, especially in the typical for induction heating high frequency range, as a parasitic capacitance to a certain extent a weak point for displacement currents to the constant potential represents.
  • the carrier device consists in particular of metal, for example of aluminum, an aluminum alloy, copper or steel, at least in the region of the carrier surface, wherein the metal is preferably used in the form of a metal sheet.
  • the invention comprises at least one spacer (spacer, spacers) of dielectric material, preferably with a low relative dielectric constant (as close as possible to 1), for increasing the distance between the induction coil and the support means.
  • the openings may be punched in the carrier surface.
  • the recesses or recesses may be embossed in the support surface.
  • the cooking device may be formed as an induction cooking and then includes at least one hob plate for setting up cookware, each induction coil is disposed below an associated cooking zone of the hob plate.
  • a cooking oven can be equipped with a closable cooking chamber with the induction heating according to the invention.
  • the frequency components of the electric field of the generator are generally above a fundamental frequency between about 20 kHz and about 100 kHz, preferably about 25 kHz, and range in the harmonic frequencies up to the range of 10 MHz.
  • control unit comprises a common-mode filter unit which can be connected to a mains voltage and is electrically coupled to the constant potential for suppressing common-mode interference.
  • the common-mode filter unit preferably comprises two inductances connected in opposite directions, in each case one pole of the mains voltage, in particular a current-compensated toroidal choke with two coils arranged in opposite directions on a toroidal core, wherein preferably each inductor is connected via an associated capacitor is electrically coupled to the constant potential.
  • the induction coil also includes on its underside field guide body made of a magnetically conductive material, in particular a ferritic or densitic material, for guiding the magnetic field of the induction coil. There are then the induction coil with their Feldleit stresses on the support device. The parasitic capacitance between the induction coil and the support means can now also be reduced by reducing the field guide bodies and the additional spaces filled with air or other dielectric material formed thereby.
  • a magnetically conductive material in particular a ferritic or densitic material
  • FIG. 4 An Indutationsgar worn is shown, the structure of which is known in principle.
  • the Indu Vietnamese yogurtsgar shark comprises a hob plate 1, on which in a cooking zone a cooking product 2 is placed, in which food is 6.
  • a susceptor coil 5 is shown in the bottom of the Gargut experimentsers 2 .
  • an induction coil 3 is arranged, which is designed as a flat coil with a substantially parallel to the hob plate 1 aligned plane.
  • the induction coil 3 is arranged on one or more field-guiding bodies 4, preferably by means of an adhesive connection.
  • the one or more field guide 4 are arranged on a support surface 70 of a support means 7, in particular also glued, and are preferably made of a material having a high magnetic permeability and with the lowest possible electrical conductivity, such as a ferritic or densitic material.
  • the adhesive layers are not only intended for fixing, but also isolate the components electrically from each other.
  • other fixing means for connecting the induction coil 3 to the field conducting bodies 4 or the carrier device 7 or the field guide 4 may be provided with the support means 7, for example a releasable connection such as a screw or latching connection. Electrical isolation is then generally achieved by separate means.
  • FIG. 6 A special, known per se embodiment of the induction heater is in FIG. 6 shown.
  • the induction coil 3 is enclosed together with six star-shaped field guide bodies 4 in a housing 15, which consists in particular of a heat-resistant plastic.
  • the side up in the view is the bottom, with which the whole unit is placed on the carrier device.
  • the carrier device 7 consists of an electrically conductive material, in particular metal, for example aluminum or an aluminum alloy, copper or a steel, in particular of a metal sheet.
  • the support means 7 is in the illustrated embodiment, a box-shaped with the continuous support surface 70 on the induction coil 3 side facing and laterally thereof downwardly projecting side walls.
  • an electric control unit 8 is worn, which drives the induction coil 3 electrically.
  • the control unit 8 is fastened to the carrier device 7 by means of one or more screws 11.
  • the screw 11 at the same time establishes an electrical connection between the control unit 8 and the carrier device 7, which is connected directly to the earth (ground) or, more generally, to a substantially constant potential.
  • the electrical connection of the carrier device 7 to the ground can also be realized independently of the mechanical fastening with a separate electrically conductive connection, for example an electrical cable and / or a clip wiring.
  • the control unit 8 supplies during operation of the Indu Vietnamesesgar dressed the induction coil 3 with a time-varying electric field (electrical voltage) containing high-frequency components in the range from a fundamental frequency (fundamental frequency) of 25 kHz.
  • a time-varying electric field electric voltage
  • the induction coil 3 now generates a time-varying magnetic field whose flux density in the FIG. 4 is denoted by B and whose field lines are shown in dashed lines, with a frequency spectrum corresponding to the electric field of the control unit 8.
  • the field guide 4 concentrate and concentrate the magnetic field B, so that it is largely shielded down.
  • the magnetic field B penetrates the cooking field plate 1, which consists of a dielectric heat-resistant material, for example a glass ceramic, glass or a ceramic, and induces an electric current in the susceptor coil 5 of the food container 2 which heats the food container 2 by Joule losses.
  • the heating effect is generally reinforced by the fact that a ferromagnetic material is provided, whereby additional thermal energy is released by Ummagnetleitersvone in the material of the Gargut mattersers 2. It can then be the bottom of the Gargut mattersers 2 simply made of ferromagnetic material.
  • a susceptor coil 5 is not essential.
  • the carrier device 7 additionally has the functions of dissipating heat from the induction coil 3 and homogenizing the temperature distribution and adapting the resonance frequency. Furthermore, the carrier device 7 shields the electronic components of the control unit 8 from the magnetic field of the induction coil 3.
  • FIG. 1 shows a possibility in which the support surface 70 of the support means 7 is further spaced from the induction coil 3 by introducing indentations 40 in these areas.
  • the field guide 4 are then only in the lying outside of the indentation 40 areas of the support surface 70 of the support means 7, while between the Feldleit stressesn 4 and the downwardly bulging support surface 70 of the support means 7 now air-filled spaces are formed.
  • the indentations 40 may in particular be produced by embossing in the metal sheet and may be formed in a variety of embodiments and design options.
  • the depth of the indentations 40 which corresponds to the increase in the distance between the induction coil 3 and support means 7, may in particular be in the range between 0.2 mm and 5 mm, preferably in the range between 0.5 mm and 2 mm.
  • This embodiment according to FIG. 1 has the advantage that the electromagnetic shielding effect of the carrier device 7 is essentially substantially preserved via the carrier surface 70.
  • FIG. 2 shows a further possibility for reducing the parasitic capacitance C D between the induction coil 3 and the support means 7.
  • openings 41 which may be punched, for example.
  • the openings 41 can be designed differently. In the case of a circular induction coil 3, a radial arrangement of the openings 41 on radial rays offset relative to each other offers itself, wherein, as illustrated, in particular the inside width of the openings 41 can increase towards the outside.
  • the field guide 4 are now again only in the intermediate regions between the openings 41 on the support surface 70.
  • the shape and arrangement of the openings 41 in the carrier device 7 is preferably dependent on the desired shielding effect, which in turn is dependent on the used frequency spectrum of the induction coil 3 and control unit 8 induction heating device, and the other properties, in particular the thermal properties of the carrier device. 7 selected.
  • an additional dielectric layer 10 is arranged as a spacer between the carrier surface 70 of the carrier device 7 and the field-guiding bodies 4.
  • This dielectric layer 10 is dependent chosen from the desired parasitic capacitance C D , in particular with regard to their layer thickness and their relative dielectric constants.
  • the layer thickness of the dielectric layer 10 can be selected in particular in the range between 0.2 mm and 5 mm, preferably in the range between 0.5 mm and 2 mm.
  • the relative dielectric constant is preferably chosen as close to 1 as possible.
  • the dielectric layer 10 may in particular be a foil or even a sheet of high-temperature paper-like material which is glued to the field guide body 4 and the carrier surface 70.
  • FIG. 5 shows an electrical circuit diagram for the control unit 8 of Indu Vietnamesesgar worn according to the 1 to 4 .
  • the mains voltage U N On the left side of the circuit diagram is the mains voltage U N , which corresponds to the normal power supply 230 V with a frequency of 50 Hz.
  • two capacitors C1 and C2 and a rectifier bridge G are connected.
  • two inductors L1 and L3 and a main switch S3 are connected and in the other phase, a further inductance L2.
  • a capacitor C3 or C4 departs from each phase into a branch which is connected to earth 9.
  • a differential filter is formed which suppresses differential mode noise in the two phases of the mains voltage UN.
  • the two inductors L1 and L2 and the two capacitors C3 and C4 form a filter for suppressing common mode noise in the phases of the supply voltage U N (common mode noise filter).
  • the two inductors L1 and L2 can be formed in particular with a current-compensated toroidal core choke with two opposing coils on a common ring core, but of course also be realized with two separate components. Since the inductors L1 and L2 at the same time must be able to pass the full mains voltage U N in push-pull operation (antiphase normal operation), the requirements for the inductors L1 and L2 representing coils with the toroidal core are quite high. In order to avoid saturation of the core by the push-pull interference, namely quite high-quality magnetic materials are required.
  • the parasitic capacitance C D from the inductance L of the induction coil 3 to the carrier device 7 and thus to the earth 9 is connected via the capacitors C3 and C4 to the filter for the suppression of common-mode noise and brings by the common-mode noise caused by it or the cores of the coils for the inductors L1 and L2 are even faster in saturation.
  • the reduction of the parasitic capacitance C D achieved in accordance with the invention now has the great advantage that the component or components for the inductors L1 and L2 must or must meet lower requirements and, as a result, a considerable cost saving is achieved.
  • the on the right side of the diagram according to FIG. 5 shown part of the circuit is one of several possible standard circuits for the implementation of the mains voltage U N in the required for the operation of the induction coil 3 with the inductance L high frequency voltage U HF .
  • This control circuit also referred to as a half-bridge, contains two separately controllable electronic switches S1 and S2, for example semiconductor switching elements such as thyristors, bipolar power transistors, IGBTs, Darlingtons circuits or MCTs, as well as three capacitors C5, C6 and C7 and the already mentioned rectifier bridge G.
  • the high-frequency voltage U HF is preferably in a frequency range above the fundamental frequency 25 kHz.
  • Other possibilities, not shown but standard, for generating the high frequency voltage U HF are a single switch and a full bridge with four switches. The advantages of the measures according to the invention also apply to these control circuits.
  • the Indudictionsgar With respect to the mechanical structure and the materials used as also be formed with respect to the electrical conditions, in another known embodiment, for example, according to one of the in WO 97/20451, WO 98/41061, WO 98 / 41062 , WO 98/41063 or WO 98/41064 disclosed embodiments, then according to the invention again corresponding means for reducing the capacitance between the carrier and coil are provided.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Cookers (AREA)

Claims (10)

  1. Installation de cuisson avec
    a) au moins une installation de chauffage à induction pour produire un champ magnétique modifiable dans le temps avec au moins une bobine d'induction (3) et au moins une unité de commande (8) pour appliquer un champ électrique modifiable dans le temps à la bobine d'induction,
    b) une installation de support réglée à un potentiel électrique sensiblement constant, en particular mise à la terre, en un matériau électriquement conducteur avec une face de support (70) pour la bobine d'induction,
    c) des moyens (10, 40, 41) pour réduire la capacité électrique (CD) entre la bobine d'induction et l'installation de support,
    d) dans laquelle sont disposés à un côté inférieur de la bobine d'induction des corps conducteurs de champ (4) en un matériau magnétiquement conducteur, en particulier en un matériau ferritique,
    e) dans laquelle les moyens pour réduire la capacité électrique comprennent au moins une couche intermédiaire (10) en matériau diélectrique disposée entre la bobine d'induction et l'installation de support, de préférence avec une constante de diélectricité relative basse,
    f) l'épaisseur de couche de la couche intermédiaire (10) en matériau diélectrique étant choisie dans la plage comprise entre 0,2 mm et 5 mm, de préférence dans la plage comprise entre 0,5 mm et 2 mm,
    g) la couche intermédiaire (10) étant un film ou une feuille en matériau similaire à du papier haute température, qui est collé(e) aux corps conducteurs de champ (4) et à la face de support (70).
  2. Installation de cuisson selon la revendication 1, dans laquelle les moyens pour réduire la capacité électrique comprennent en plus une ou plusieurs ouvertures (41) dans la face de support de l'installation de support.
  3. Installation de cuisson selon l'une des revendications précédentes, dans laquelle les moyens pour réduire la capacité électrique comprennent en plus un ou plusieurs évidements ou creux (40) dans la face de support de l'installation de support.
  4. Installation de cuisson selon l'une des revendications précédentes, dans laquelle l'installation de support, au moins dans la zone de la face de support, est réalisée en métal ou en un alliage métallique, en particulier en aluminium, cuivre ou acier, en particulier en une tôle métallique.
  5. Installation de cuisson selon la revendication 2 et la revendication 4, dans laquelle les ouvertures sont découpées dans la face de support.
  6. Installation de cuisson selon la revendication 3 et 4, dans laquelle les évidements ou creux sont repoussés dans la face de support.
  7. Installation de cuisson selon l'une des revendications précédentes, avec au moins une plaque de cuisson (1) pour poser des ustensiles de cuisson, dans laquelle chaque bobine d'induction est disposée en dessous d'une zone de cuisson associée de la plaque de cuisson.
  8. Installation de cuisson selon l'une des revendications précédentes, dans laquelle les parts en fréquence du champ électrique de l'unité de commande se situent entre environ 20kHz et environ 100kHz, de préférence au-dessus d'environ 25kHz.
  9. Installation de cuisson selon l'une des revendications précédentes, dans laquelle l'unité de commande comprend une unité de filtration en mode commun pouvant être connectée au secteur et couplée électriquement au potentiel constant pour supprimer des bruitages en mode commun.
  10. Installation de cuisson selon la revendication 9, dans lequelle l'unité de filtration en mode commun comprend deux inductances montées en sens opposé, pouvant être reliées électriquement à chaque fois à un pôle du secteur, en particulier une bobine à noyau toroïdal compensée en courant avec deux bobines disposées en sens opposé sur un noyau toroïdal, dans laquelle de préférence chaque inductance est couplée électriquement par un condensateur associé au potentiel constant.
EP01101019.6A 2000-02-04 2001-01-18 Appareil ménager de cuisson à induction Expired - Lifetime EP1122983B2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10004934 2000-02-04
DE10004934 2000-02-04
DE10006863 2000-02-16
DE10006863A DE10006863C2 (de) 2000-02-04 2000-02-16 Gareinrichtung

Publications (4)

Publication Number Publication Date
EP1122983A2 EP1122983A2 (fr) 2001-08-08
EP1122983A3 EP1122983A3 (fr) 2007-05-23
EP1122983B1 EP1122983B1 (fr) 2008-05-14
EP1122983B2 true EP1122983B2 (fr) 2017-12-27

Family

ID=26004197

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01101019.6A Expired - Lifetime EP1122983B2 (fr) 2000-02-04 2001-01-18 Appareil ménager de cuisson à induction

Country Status (2)

Country Link
EP (1) EP1122983B2 (fr)
DE (1) DE50113954D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102577598B (zh) 2009-10-23 2014-07-16 松下电器产业株式会社 感应加热装置
EP2427032B1 (fr) * 2010-09-06 2016-12-21 BSH Hausgeräte GmbH Dispositif de champ de cuisson

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163139A (en) * 1972-09-18 1979-07-31 White Consolidated Industries, Inc. Cooking vessel capacitive decoupling for induction cooking apparatus
JPS577082A (en) * 1980-06-13 1982-01-14 Riccar Sewing Machine Kk Exciter for induction heater
DE4208250A1 (de) * 1992-03-14 1993-09-16 Ego Elektro Blanc & Fischer Induktive kochstellenbeheizung
FR2726962B1 (fr) * 1994-11-15 1996-12-13 Europ Equip Menager Appareil de cuisson a induction a rayonnement parasite reduit
FR2740645B1 (fr) * 1995-10-27 1997-11-21 Europ Equip Menager Bobinage inducteur multibrin a toronnage de type litz pour foyer de cuisson par induction

Also Published As

Publication number Publication date
EP1122983A3 (fr) 2007-05-23
EP1122983A2 (fr) 2001-08-08
EP1122983B1 (fr) 2008-05-14
DE50113954D1 (de) 2008-06-26

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