EP2380398B1 - Kochfeld mit zumindest einem induktor, wenigstens einem wechselrichter und einer schaltvorrichtung - Google Patents

Kochfeld mit zumindest einem induktor, wenigstens einem wechselrichter und einer schaltvorrichtung Download PDF

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Publication number
EP2380398B1
EP2380398B1 EP09771545A EP09771545A EP2380398B1 EP 2380398 B1 EP2380398 B1 EP 2380398B1 EP 09771545 A EP09771545 A EP 09771545A EP 09771545 A EP09771545 A EP 09771545A EP 2380398 B1 EP2380398 B1 EP 2380398B1
Authority
EP
European Patent Office
Prior art keywords
inductor
switching device
inverter
detection circuit
switching
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.)
Not-in-force
Application number
EP09771545A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2380398A1 (de
Inventor
Pablo Jesus Hernandez Blasco
Fernando Monterde Aznar
Daniel Palacios Tomas
Ramon Peinado Adiego
Jose-Ramon Garcia Jimenez
Ignacio Garde Aranda
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2380398A1 publication Critical patent/EP2380398A1/de
Application granted granted Critical
Publication of EP2380398B1 publication Critical patent/EP2380398B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
    • 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 invention relates to a hob with at least one inductor, at least one inverter and a switching device according to the preamble of claim 1.
  • an induction hob with multiple inductors, one inverter per inductor, one electronic switching device, and one detection circuit for detecting cookware is known.
  • the switching device opens and closes a circuit between the inductor and the inverter, so that the switching device in a first switching position establishes a connection between the inverter and the inductor and interrupts the connection between the inverter and the inductor in a second switching position.
  • a microcomputer initiates the closing of one of the switches of the switching device to connect one of the inductors during a half cycle of the heating voltage to that inverter associated with that inductor. From a voltage amplitude at a tapping point or from a decay of the voltage damping of the vibration system is determined. From a sufficient attenuation is concluded that the presence or presence of a cooking utensil element. After detection of a cookware element, the inductor is automatically put into operation.
  • the invention is therefore in particular the object of equipping a generic hob with an energy-saving pot detection device, without having to provide additional sensors.
  • the invention is particularly based on a hob with at least one inductor, at least one inverter, a switching device and a detection circuit for detecting cookware.
  • the switching device is arranged in a circuit between the inductor and the inverter, in such a way that the switching device in a first switching position establishes a connection between the inverter and the inductor and interrupts the connection between the inverter and the inductor in at least one second switching position.
  • the switching device is connected to the detection circuit in such a way that the switching device connects the inductor to the detection circuit in at least a second switching position.
  • the inductor can be linked to the detection circuit in a structurally simple manner, which can then use the inductor as an inductive sensor.
  • the detection circuit can also feed a low-voltage measuring current into the inductor, so that an energy-saving measurement in stand-by mode is possible. Thereby, an energy-saving detection mode can be made possible which, in terms of operating costs, can compete with cooktops having separate sensors.
  • the two mentioned switching positions can be supplemented by further switching positions of the switching device, which can each correspond to other functions of the hob.
  • the switching device may have switch positions in which an inductor is simultaneously connected to a plurality of inverters or an inverter simultaneously operates a plurality of inductors.
  • the switching device comprises at least one electromechanical relay with two outputs, wherein the first output is connected to the inverter and the second output is connected to the detection circuit.
  • the hob comprises a plurality of inductors, which may in particular be arranged in a grid, a grid or a matrix, the advantages of the invention are particularly significant. Again, the connections between the individual inductors with the respective inductors associated with the inverter can be opened or closed via the switching device.
  • the detection circuit with the inductor form a resonant circuit.
  • the presence or absence of the cookware can be determined depending on a resonant frequency of the resonant circuit.
  • a targeted control can be made possible if the hob comprises a control unit for reading the detection circuit and / or for switching the switching device.
  • a particularly flexible modular design can be achieved if a switch of the switching device assigned to the inductor is connected directly to the inductor.
  • the inductor may in particular comprise an inductor coil, an inductor carrier and a shielding element. These elements can be combined to form a compact inductor module, which, according to the invention, can additionally comprise the switch designed in particular as an electromechanical relay switch. Cables for establishing a connection to the inverter and to the detection circuit can be plugged directly into two different outputs of the inductor module or connected in another way, for example by means of a suitable multi-pin connector. The two outputs are connected to the two outputs of the switch whose input is in turn connected to the inductor.
  • FIG. 1 shows a matrix-type induction hob having a plurality of in-grid inductors 10.
  • the inductors 10 form a rectangular grid and may be divided into a plurality of modules, each fed by different power supply units (not shown).
  • the inductors 10 can be selectively and individually activated and deactivated, for which purpose a switching device 14 can establish or interrupt a connection between the inductors 10 and an inverter 12 assigned to the respective inductor 10.
  • the inverter 12 In a first switching position of the switching device 14, the inverter 12 is connected to the inductor 10, so that an alternating current with a frequency of a few kilohertz to a maximum of about 75 or 100 kilohertz driven by a voltage amplitude of several hundred volts through the inductors 10 flows.
  • the inductors 10 generate a strong, high-frequency magnetic field, which partially penetrates into the bottom of a cookware 18 when a cookware 18 is placed with a ferromagnetic bottom on the induction hob. Due to the changing magnetic field 18 eddy currents are generated in a ferromagnetic ground of the cookware, which eventually heat the ground.
  • FIG. 12 is a schematic diagram that does not reflect the actual arrangement of the inductors 10 with respect to the switching device 14 and the inverter 12.
  • the Switching device 14 may be mounted with the inverters 12 on a common board or form a structurally separate unit.
  • Fig. 2 schematically shows an arbitrary inductor 10 of the induction cooktop Fig. 1 with the inverter 12 associated with this inductor 10 and a detection circuit 16.
  • the detection circuit 16 may also be mounted with the switching device 14 and / or the inverters 12 on a common board or alternatively be present as a separate assembly.
  • the electromechanical relay 20 comprises two outputs 24, 26.
  • the first output 24 is connected to the inverter 12 and the second output 26 to the detection circuit 16.
  • the electromechanical relay 20 is designed as a "Double Pole Double Throw” relay (DPDT relay) with two parallel working contacts.
  • a control unit 22 reads out the detection circuit 16 and is connected via a control line 28 to the coil of an electromagnet 29 of the relay 20.
  • the control unit 22 may be a microcontroller or a freely programmable arithmetic unit which, in addition to the inductors 10, the switching device 14 and the detection circuit 16, also operates further electronic components of the hob, for example a user interface with a display or the like. The result of the cookware detection can then be shown on the display.
  • the inductor 10 forms with the detection circuit 16 a Colpitts oscillator, in which two capacitances and the inductor 10 determine the oscillation frequency.
  • the feedback necessary for the oscillation is generated by a voltage divider between the two capacitors (not shown).
  • the detection circuit 16 is supplied with a weak alternating voltage, which generates in the corresponding inductor 10 an alternating measuring voltage of about 10 or 12 volts and leads to measuring currents of a few milliamperes.
  • the inductor 10 is used in this operating state as a probe.
  • the inductor 10 forms a resonant circuit together with two capacitors.
  • By setting up the cookware 18 is reduces the inductance of the existing of the inductor 10 and the cookware 18 total system over the inductance of the free inductor 10, whereby the Resonanzfreqenz of the resonant circuit increases by about 10%.
  • the detection circuit 16 or the control unit 22 measures the resonant frequency of this overall system and concludes from the increased resonant frequency on the presence of the cookware 18th
  • FIG. 3 shows an inductor module with the inductor 10 and designed as a relay 20 switching element of the switching device 14 in a conceivable embodiment of the invention.
  • the relay 20 is directly attached to a bottom of an inductor carrier 30, so that it forms an easy to handle module with the inductor 10.
  • Corresponding connection lines to the inverters 12 and / or the detection circuit 16 can be plugged directly into the outputs 24, 26 of the relay when connecting the inductor module.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Cookers (AREA)
  • General Induction Heating (AREA)
EP09771545A 2008-12-19 2009-12-07 Kochfeld mit zumindest einem induktor, wenigstens einem wechselrichter und einer schaltvorrichtung Not-in-force EP2380398B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200803711A ES2356441B1 (es) 2008-12-19 2008-12-19 Campo de cocción con un inductor, un inversor y un dispositivo de conexión.
PCT/EP2009/066468 WO2010069788A1 (de) 2008-12-19 2009-12-07 Kochfeld mit zumindest einem induktor, wenigstens einem wechselrichter und einer schaltvorrichtung

Publications (2)

Publication Number Publication Date
EP2380398A1 EP2380398A1 (de) 2011-10-26
EP2380398B1 true EP2380398B1 (de) 2012-10-31

Family

ID=42075870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09771545A Not-in-force EP2380398B1 (de) 2008-12-19 2009-12-07 Kochfeld mit zumindest einem induktor, wenigstens einem wechselrichter und einer schaltvorrichtung

Country Status (6)

Country Link
US (1) US9668305B2 (zh)
EP (1) EP2380398B1 (zh)
KR (1) KR101603366B1 (zh)
CN (1) CN102257878B (zh)
ES (2) ES2356441B1 (zh)
WO (1) WO2010069788A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015121348A1 (de) * 2015-12-08 2017-06-08 Miele & Cie. Kg Kochfeldeinrichtung und Verfahren zum Installieren

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2535245B1 (es) 2013-11-05 2016-02-16 Bsh Electrodomésticos España, S.A. Dispositivo de campo de cocción por inducción
ES2655654T3 (es) * 2014-03-24 2018-02-21 BSH Hausgeräte GmbH Dispositivo de aparatos de cocción con una unidad de puenteo de control automático
US10237925B2 (en) * 2014-03-24 2019-03-19 BSH Hausgeräte GmbH Cooking appliance
ITBA20150014U1 (it) * 2014-04-02 2016-09-02 Ribawood Sa Pallet in struttura alleggerita e relativo connettore per traversa-pattino dotato di mezzi di facile estrazione
DE102014224051A1 (de) * 2014-11-25 2016-05-25 E.G.O. Elektro-Gerätebau GmbH Induktionskochfeld und Verfahren zur Steuerung eines Induktionskochfelds
TR201602883A2 (tr) * 2016-03-04 2017-09-21 Arcelik As İndüksi̇yon isiticili ocak güç kontrol devresi̇
WO2017163114A1 (en) * 2016-03-21 2017-09-28 BSH Hausgeräte GmbH A home appliance device and a method for operating a home appliance device
CN112393280A (zh) * 2019-08-19 2021-02-23 广东美的白色家电技术创新中心有限公司 一种电磁灶台和电磁灶台的控制方法
CN112398234A (zh) 2019-08-19 2021-02-23 广东美的白色家电技术创新中心有限公司 一种输出控制装置、方法和存储介质
KR102662903B1 (ko) * 2019-09-02 2024-05-03 삼성전자주식회사 조리 기기 및 그 제어 방법
EP4207943A1 (en) * 2021-12-30 2023-07-05 SABAF S.p.A. Induction cooktop and method for an induction cooktop

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FR2672763B1 (fr) * 1991-02-08 1993-05-07 Bonnet Sa Dispositif inducteur, destine au chauffage par induction de recipients pour la cuisine et procede de commande d'un tel dispositif.
DE4208254A1 (de) 1992-03-14 1993-09-16 Hoechst Ag Substituierte pyrimidine, verfahren zu ihrer herstellung und ihre verwendung als schaedlingsbekaempfungsmittel und fungizid
FR2728132A1 (fr) * 1994-12-09 1996-06-14 Bonnet Sa Dispositif de chauffage par induction de recipient et procede de commande d'un tel dispositif
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DE19700753C2 (de) * 1997-01-11 2000-09-14 Schott Glas Kochfeld mit einer nicht-metallischen Kochplatte
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015121348A1 (de) * 2015-12-08 2017-06-08 Miele & Cie. Kg Kochfeldeinrichtung und Verfahren zum Installieren

Also Published As

Publication number Publication date
CN102257878A (zh) 2011-11-23
ES2356441A1 (es) 2011-04-08
EP2380398A1 (de) 2011-10-26
US20110233199A1 (en) 2011-09-29
CN102257878B (zh) 2013-09-11
KR20110110193A (ko) 2011-10-06
KR101603366B1 (ko) 2016-03-14
ES2356441B1 (es) 2012-03-13
WO2010069788A1 (de) 2010-06-24
US9668305B2 (en) 2017-05-30
ES2394151T3 (es) 2013-01-22

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