EP1122983A2 - Appareil ménager de cuisson à induction - Google Patents

Appareil ménager de cuisson à induction Download PDF

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Publication number
EP1122983A2
EP1122983A2 EP01101019A EP01101019A EP1122983A2 EP 1122983 A2 EP1122983 A2 EP 1122983A2 EP 01101019 A EP01101019 A EP 01101019A EP 01101019 A EP01101019 A EP 01101019A EP 1122983 A2 EP1122983 A2 EP 1122983A2
Authority
EP
European Patent Office
Prior art keywords
induction coil
carrier
cooking device
carrier device
cooking
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
EP01101019A
Other languages
German (de)
English (en)
Other versions
EP1122983B1 (fr
EP1122983A3 (fr
EP1122983B2 (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
Therma AG
AEG Hausgeraete GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26004197&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1122983(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE10006863A external-priority patent/DE10006863C2/de
Application filed by Therma AG, AEG Hausgeraete GmbH, Electrolux Home Products Denmark AS, Electrolux France SAS filed Critical Therma AG
Publication of EP1122983A2 publication Critical patent/EP1122983A2/fr
Publication of EP1122983A3 publication Critical patent/EP1122983A3/fr
Publication of EP1122983B1 publication Critical patent/EP1122983B1/fr
Application granted granted Critical
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 with a cooktop are known with two or four cooking zones, with at least one below one of the cooking zones is high frequency by a generator controllable induction coil for inductive heating of cookware placed on the cooking zone.
  • the Induction coil is on a metallic support device fixed.
  • the invention has for its object a special Indicate cooking equipment with induction heating.
  • the invention is based on that obtained on the basis of measurements surprising observation that in the operation of the Induction heating device high-frequency interference currents occur can meet the limit values specified in the EN 55011 standard exceed if the carrier device to constant electrical potential is switched, in particular is grounded.
  • the invention proceeds from one of the measurements reasoned that excessive interference currents electrical capacitance between the induction coil and the carrier is responsible. Even with one electrical insulation of the induction coil from the carrier device, which have a direct charge flow at least largely prevented, still represents the induction coil and carrier means formed capacitor, especially in the high-frequency range typical for induction heating, as a kind of parasitic capacitance Weak point for displacement currents to constant potential there.
  • the carrier device accordingly at least exists in particular in the area of the carrier surface made of metal, for example made of aluminum, an aluminum alloy, copper or steel, the metal preferably used in the form of a sheet becomes.
  • the openings can be punched into the carrier surface.
  • the Recesses or indentations can be made in the support surface be imprinted.
  • the cooking device can be designed as an induction hob and then comprises at least one cooktop for setting up cookware, each induction coil arranged below an associated cooking zone of the hob plate is.
  • the frequency components of the electrical field of the generator are generally between a fundamental frequency about 20 kHz and about 100 kHz, preferably about 25 kHz, and range in the upper frequencies (harmonics) into the range of 10 MHz.
  • the control unit comprises in a particularly advantageous manner Embodiment a connectable to a mains voltage and electrically coupled with the constant potential Common mode filter unit for suppressing common mode interference.
  • the common mode filter unit preferably comprises two with one pole each of the mains voltage electrical connectable inductors connected in opposite directions, in particular a current-compensated toroidal choke with two a toroidally arranged coils, preferably each inductance via an associated capacitor electrically coupled to the constant potential is.
  • the induction coil comprises its underside also field guide, from one magnetically conductive material, especially a ferritic or dense material to guide the magnetic field the induction coil. Then there is the induction coil with their field guiding bodies on the carrier device.
  • the parasitic capacitance between the induction coil and the carrier device can now also by reducing the Feldleit stresses and the additional formed thereby Air or other dielectric material filled gaps be reduced.
  • the induction cooking device comprises a hob 1 on which in a Cooking zone a food container 2 is set up in which Food 6 is located.
  • a food container 2 In the bottom of the food container 2 is one Susceptor coil 5 shown.
  • an induction coil 3 Below the cooking zones of the Hob 1 is arranged an induction coil 3, the is designed as a flat coil with a plane aligned parallel to hob 1.
  • the induction coil 3 is, preferably by means of an adhesive connection, arranged on one or more field guiding bodies 4.
  • the field guide body or bodies 4 are on a support surface 70 of a carrier device 7, in particular also glued on, and preferably consist of a material with a high magnetic permeability and with the lowest possible electrical conductivity, for example a ferritic or densitic Material.
  • the adhesive layers are not only intended for fixation, but also electrically isolate the components from each other.
  • other fixation means can also be used to connect the induction coil 3 with the Feldleit stresses 4 or the carrier device 7 or the Feldleit stresses 4 provided with the carrier device 7 be, for example, a detachable connection like one Screw connection or snap connection.
  • the electrical insulation is then generally achieved by separate means.
  • FIG. 1 A special, known embodiment of the induction heating device is shown in FIG.
  • the induction coil 3 is arranged together with six in a star shape Feldleitmaschine 4 enclosed in a housing 15, the particular consists of a heat-resistant plastic.
  • the top side of the view is the bottom, with which the whole unit is placed on the carrier device becomes.
  • the carrier device 7 consists of an electrically conductive Material, especially metal, for example aluminum or an aluminum alloy, copper or one Steel, in particular from a metal sheet.
  • the carrier device 7 is box-shaped in the illustrated embodiment formed with the continuous support surface 70 the side facing the induction coil 3 and laterally of which the side walls protrude downwards.
  • an electrical control unit 8 is carried, which Induction coil 3 electrically controlled.
  • the screw 11 also provides an electrical connection between the Control unit 8 and the carrier device 7 ago, directly with the earth (mass) or more generally one essentially constant potential is connected.
  • the electrical connection the carrier device 7 to earth can also be independent from mechanical fastening with a separate electrical conductive connection, for example an electrical Cable and / or a clip wiring, realized become.
  • the control unit 8 supplies the induction cooking device during operation the induction coil 3 with a time variable electrical field (electrical voltage), the high-frequency components in the range from a basic frequency (Fundamental frequency) of 25 kHz.
  • a time variable electrical field electric voltage
  • the high-frequency components in the range from a basic frequency (Fundamental frequency) of 25 kHz.
  • By induction generates the induction coil 3 now a time-varying magnetic field, the flux density of which is shown in FIG B is designated and its field lines are shown in dashed lines are with the electrical field of the control unit 8 corresponding frequency spectrum.
  • the field guiding bodies 4 concentrate and concentrate the magnetic field B so that it is largely shielded from below.
  • the hob plate 1 which consists of a dielectric heat-resistant material, for example a glass ceramic, glass or a ceramic, and induces a in the susceptor coil 5 of the food container 2 electric current caused by Joule 's losses Food container 2 is heated.
  • the heating effect is general reinforced by the fact that a ferromagnetic Material is provided, creating additional thermal Energy through magnetic reversal processes in the material of the Food container 2 is free. It can also be the floor of the food container 2 simply made of ferromagnetic material consist.
  • a susceptor coil 5 is not absolutely necessary.
  • the carrier device 7 has the mechanical carrier function the functions for the induction coil 3 the heat dissipation from the induction coil 3 and homogenization the temperature distribution and the adjustment the resonance frequency.
  • the carrier device also shields 7 the electronic components of the control unit 8 from the magnetic field of the induction coil 3.
  • a measurement according to EN 55011 now showed that in this known induction cooking device according to FIG. 4, undesired interference currents (and interference fields caused thereby) occur in a specific high-frequency range, in particular in a range between 150 kHz and 500 kHz. It was also found that these interference currents are essentially due to a parasitic capacitance C D between the induction coil 3 and the carrier device 7. According to the invention it is therefore proposed to reduce this parasitic capacitance C D or even to eliminate it as far as possible.
  • the indentations 40 can be created in particular by embossing in the metal sheet and can be in a variety of embodiments and Design options are trained.
  • the depth of the Indentations 40 that increase the distance between Corresponds to induction coil 3 and carrier device 7, can in particular 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 largely preserved over the carrier surface 70 remains.
  • a number of openings 41 are now provided in the carrier surface 70 of the carrier device 7 below the field guiding bodies 4, which can be punched, for example. Through these openings 41, the capacitor surface opposite the induction coil 3 and formed by the carrier surface 70 is reduced and the parasitic capacitance C D is also reduced.
  • the openings 41 can also be designed differently. In the case of a circular induction coil 3, there is a radial arrangement of the openings 41 along radial rays offset with respect to one another, as shown, in particular the clear width of the openings 41 can increase towards the outside.
  • the field guiding bodies 4 are now only in the intermediate areas 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 depends on the frequency spectrum of the induction coil 3 and control unit 8 used, and the other properties, in particular the thermal properties, of the carrier device 7 chosen.
  • FIG. 3 A third possibility for reducing the parasitic capacitance C D between the induction coil 3 and the carrier device 7 is illustrated in FIG. 3.
  • 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 selected as a function of the desired parasitic capacitance C D , in particular with regard to its layer thickness and its relative dielectric constant.
  • the layer thickness of the dielectric layer 10 can be chosen 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 to be as close as possible to 1.
  • the dielectric layer 10 can in particular be a film or even a sheet of high-temperature paper-like material which is bonded to the field guiding body 4 and the carrier surface 70.
  • the dielectric layer 10 can of course also be applied directly to the carrier device 7, for example by vapor deposition, sputtering or the like.
  • FIG. 5 shows an electrical circuit diagram for the control unit 8 of the induction cooking device according to FIGS. 1 to 4.
  • the mains voltage U N which corresponds to 230 V with a frequency of 50 Hz in the normal electricity network.
  • Two capacitors C1 and C2 and a rectifier bridge G are connected between the two phases of the mains voltage U N.
  • Two inductors L1 and L3 and a main switch S3 are connected in series in one of the two phases and another inductor L2 in the other phase.
  • a capacitor C3 or C4 goes from each phase into a branch which is connected to earth 9.
  • the two inductors L1 and L2 and the two capacitors C3 and C4 form a filter for suppressing common mode interference 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 choke with two opposing coils on a common toroid, but can of course also be realized with two separate components. Since the inductors L1 and L2 must also be able to pass the full mains voltage U N in push-pull mode (normal phase operation), the requirements for the coils with the toroidal core representing the inductors L1 and L2 are quite high. In order to avoid saturation of the core due to the push-pull disturbance, very 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 suppressing common mode interference and brings the cores of the coils for the common mode interference caused by it the inductors L1 and L2 saturate even faster.
  • the reduction of the parasitic capacitance C D achieved according to the invention now has the great advantage that the component or components for the inductors L1 and L2 have to or have to meet lower requirements, thereby achieving considerable cost savings.
  • the part of the circuit shown on the right-hand side of the circuit diagram in accordance with FIG. 5 is one of several possible standard circuits for converting the mains voltage U N into the high-frequency voltage U HF required for operating the induction coil 3 with the inductance L.
  • This control circuit also known 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, Darlington circuits or MCTs, as well as three capacitors C5, C6 and C7 and the rectifier bridge G. already mentioned.
  • the high-frequency voltage U HF is preferably in a frequency range above the basic frequency 25 kHz.
  • Other options (not shown, but used as standard) for generating the high-frequency voltage U HF are a single switch circuit and a full bridge circuit with four switches. The advantages of the measures according to the invention also come into play in these control circuits.
  • the induction cooking device can also be designed in another known embodiment with regard to the mechanical structure and the materials used and also with regard to the electrical conditions, for example according to one of the methods described in WO 97/20451 , WO 98/41061 , WO 98 / 41062 , WO 98/41063 or WO 98/41064 disclosed embodiments, in which case according to the invention appropriate means for reducing the capacity between the carrier and the coil are to be provided.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Cookers (AREA)
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 true EP1122983A2 (fr) 2001-08-08
EP1122983A3 EP1122983A3 (fr) 2007-05-23
EP1122983B1 EP1122983B1 (fr) 2008-05-14
EP1122983B2 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)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011048816A1 (fr) 2009-10-23 2011-04-28 パナソニック株式会社 Dispositif de chauffage par induction
EP2427032A3 (fr) * 2010-09-06 2013-01-16 BSH Bosch und Siemens 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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011048816A1 (fr) 2009-10-23 2011-04-28 パナソニック株式会社 Dispositif de chauffage par induction
US9295110B2 (en) 2009-10-23 2016-03-22 Panasonic Intellectual Property Management Co., Ltd. Inductive heating device
EP2427032A3 (fr) * 2010-09-06 2013-01-16 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de champ de cuisson

Also Published As

Publication number Publication date
EP1122983B1 (fr) 2008-05-14
EP1122983A3 (fr) 2007-05-23
DE50113954D1 (de) 2008-06-26
EP1122983B2 (fr) 2017-12-27

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