EP2271175A2 - Procédé et dispositif de surveillance thermique d'un ustensile de cuisson chauffable inductivement - Google Patents

Procédé et dispositif de surveillance thermique d'un ustensile de cuisson chauffable inductivement Download PDF

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Publication number
EP2271175A2
EP2271175A2 EP10178369A EP10178369A EP2271175A2 EP 2271175 A2 EP2271175 A2 EP 2271175A2 EP 10178369 A EP10178369 A EP 10178369A EP 10178369 A EP10178369 A EP 10178369A EP 2271175 A2 EP2271175 A2 EP 2271175A2
Authority
EP
European Patent Office
Prior art keywords
frequency
temperature
cooking
cooking vessel
predetermined
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
EP10178369A
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German (de)
English (en)
Other versions
EP2271175B1 (fr
EP2271175A3 (fr
Inventor
Martin Andersson
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 Home Products Corp NV
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Electrolux Home Products Corp NV
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Filing date
Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Publication of EP2271175A2 publication Critical patent/EP2271175A2/fr
Publication of EP2271175A3 publication Critical patent/EP2271175A3/fr
Application granted granted Critical
Publication of EP2271175B1 publication Critical patent/EP2271175B1/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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to a method and a device for thermal monitoring of an inductively heated cooking vessel.
  • Induction cooking surfaces have glass ceramic surfaces for receiving the cooking vessels and arranged below induction coils for their heating.
  • the induction coils an alternating current in the frequency range of about 15 kHz to 80 kHz, in particular about 20 kHz to 60 kHz supplied.
  • the resulting alternating fields generate eddy currents in ferromagnetic bottoms of the cooking vessels, which lead to heat generation.
  • Their monitoring is done by sensor systems that are complex and / or sluggish.
  • the invention has for its object to provide a method and apparatus for thermal monitoring of an inductively heated cooking vessel, which operate simple and low in inertia.
  • the thermal monitoring of the inductively heatable cooking vessel takes place by monitoring the frequency (f) of the alternating current (I) causing the inductive heating.
  • monitoring for particularly qualitative or erratic changes in the temperature-time profile (T (t)) is preferably carried out as monitoring for particularly qualitative or erratic changes in the frequency-time profile (f (t)) and / or to changes and / or absolute values of the first derivative (f '(t)) of the frequency-time curve (f (t)).
  • the monitoring is carried out to absolute temperatures (T) by assigning predetermined frequencies (f) and / or frequency ratios (f / f-start) to predetermined temperatures (T) and / or vice versa.
  • the monitoring takes place on the boiling of a food in the cooking vessel and / or on the empty cooking of the cooking vessel or the dry cooking of the food therein therein as monitoring the frequency-time curve (f (t)) to predetermined qualitative or erratic Changes and / or to predetermined changes and / or absolute values of the first derivative (f '(t)) of the frequency-time curve (f (t)).
  • the alternating current (I) or the corresponding power (P) is reduced to a predetermined value if, during this monitoring, one or more changes have been determined which coincide with one or more predetermined changes.
  • the alternating current (I) or the corresponding power (P) is switched off, in particular, if one or more of these are monitored Changes have been detected that match one or more predetermined changes.
  • the predetermined qualitative or sudden change (s) of the frequency-time curve (f (t)) are in particular in or immediately after the transition from the falling frequency curve (f (t)) in FIG the constant frequency curve (f (t)) and / or from the constant frequency curve (f (t)) in the falling frequency curve f (t).
  • the assignment of the frequencies (f) and / or frequency ratios (f / f-start) to the temperatures (T) is preferably carried out as a function of predetermined properties, in particular material properties of the cooking vessel, which are predetermined in particular for use or queried by the user, for example, by specifying a selection list.
  • the assignment of the frequencies (f) and / or frequency ratios (f / f-start) to the temperatures (T) can also take place as a function of predetermined powers (P).
  • a method for monitoring and / or control of the cooking process in an inductively heated cooking vessel is available in which during cooking temperatures and / or temperature changes as frequencies and / or frequency changes of a inductive heating causing alternating current detected and evaluated to signal the temperature of the cooking vessel and / or influence.
  • the third means comprise in particular first memory means with which predetermined qualitative or sudden changes of frequency-time curves (f (t)) and / or predetermined changes and / or absolute values of first derivatives (f '(t)) of frequency-time Gradients (f (t)) can be stored, which represent, in particular, boiling of a food item in the cooking vessel and / or empty cooking of the cooking container or dry cooking of the food item therein as reference data.
  • the third means may also have second storage means with which predetermined frequency-temperature profiles (f (T)) and / or frequency-ratio temperature profiles (f / f-start (T)) can be stored, in particular per cooking vessel property and / or capacity ,
  • input means are assigned to the third means with which the user can enter desired temperatures and / or programs, in particular cooking programs containing temperatures, and / or services and / or cooking vessels or their properties.
  • the third means in particular have computing means with which the frequencies determined with the second means and the data stored with the first and / or second storage means and the data input with the input means can be offset to AC currents or corresponding powers which are the temperature of the cooking vessel influence according to the entered and / or stored data.
  • the influencing of the temperature may consist in the predetermined reduction in determined boiling and / or determined emptying or dry cooking and / or in their adjustment or maintenance according to user data entered.
  • An inventive cooking appliance has at least one of the above-described devices.
  • the power of the cooking vessel receiving the cooking zone is regulated. For this it is necessary to measure the temperature in the cooking vessel. Normally, the user has to manually change the power level on the duty-controlled cooking zones in order to obtain a certain temperature in the cooking vessel.
  • the following describes a method and a device for measuring temperatures T or temperature changes in the bottom of a cooking vessel or cooking appliance 8 standing on an induction cooking zone K and for using the information for controlling the power P of the induction cooking zone K so that automatic cooking functions become possible ,
  • the resonant circuit of the induction heating system consists of an inverter 5 and an induction coil 6, which is arranged under a cooking appliance or cookware 8 supporting surface 9, for example, a glass ceramic plate.
  • the bottom of the harness 8 is ferromagnetic. In it, heat is generated by eddy currents induced by the magnetic field of the induction coil 6.
  • This impedance Z is influenced by the temperature T in the dish bottom, in particular due to changes in the electromagnetic properties of the bottom material. In turn, it influences the oscillation frequency f of the inverter 5, which is finally used to measure the temperature T in the bottom of the dish.
  • the coil current I is measured by means of a current transformer 7. Its basic appearance shows Fig. 2 ,
  • the oscillation frequency f (20 to 60 kHz) is modulated with the rectified mains supply.
  • This signal leads to a frequency measuring circuit 3, which analyzes the signal and determines the oscillation frequency f.
  • the size of the mains voltage supply is measured by a voltage measurement circuit 10 and the information is passed to a control logic 2.
  • the control logic contains control algorithms A and ensures filtering of the signal if it is noisy.
  • Algorithm A calculates the appropriate power P for the cooking zone K to ensure the desired functionality, based on the information about the frequency f, the power supply U, and the user settings N entered by user interface (FIG. Fig. 3 ).
  • the operating frequency of the induction inverter 5 moves in particular in the range between 20 and 60 kHz, depending on the power level.
  • the frequency f ie, the inverse of the period of a cycle
  • the frequency f also varies over the rectified sinusoidal period (ie, over a period of 10 ms) by about 10%. Therefore, the frequency is measured when the mains voltage has its maximum.
  • a timer with a delay time of 5 ms which is triggered at the zero crossing of the mains voltage, triggers the frequency measurement after the delay time has elapsed.
  • Fig. 2 is the triggering of the timer with ZT and the triggering of the frequency measurement with FM, the time delay signal with ZV.
  • the signal of the current transformer 7 is sampled with an A / D converter and stored in a memory (500 samples in an interval of 666 ns gives 25-75 samples per period). From this, the period of the oscillations (6-20, depending on the frequency) is calculated, and in turn the center frequency. Effects of the frequency by changes in the mains power supply (by the mains power supply 4) can be corrected by measuring the voltage (by the voltage measuring device 10) and offsetting with empirically determined values or formulas. The corrected and / or uncorrected frequency is then used in the algorithms to signal temperatures.
  • a calibration curve f (T) is to be recorded. This is done by measuring the temperature T in the dish bottom (by means of separate temperature sensors) and registering the temperature T and the frequency f at a fixed power setting P. The measurement data can then be adjusted to an accepted accuracy using a curve fitting method, such as polynomial fitting. At the end of this section you get a relationship f (T) for a particular harness. However, since the frequency f depends on the power level P, all this has to be repeated for the other power levels to be used to finally have a relation f (T, P) stored in the control logic as a calibration curve (for a particular harness).
  • Fig. 4 shows a family of decreasing f (T) calibration curves for powers P1, P2, P3 and P4.
  • control logic associates the measured frequency f with a temperature T for a particular power level P. This then makes it possible to perform the desired functions according to the algorithms stored in the control logic perform.
  • This method requires identification of the harness 8 used.
  • T-start room temperature
  • f-start start frequency
  • the control algorithm A monitors the change of the frequency characteristic f (t) over the time t ( Fig. 5 ).
  • the first derivative f '(t) changes from a negative value to approximately zero, the bottom of the pot has reached a constant temperature, so that the time t, to which the food boils or boils, can be derived.
  • the power P or the current I in the induction coil 6 is reduced to a predetermined value. Notwithstanding this shows Fig.
  • a drop in frequency f occurs when, for example, water has escaped from the pot. This can be recognized as a sudden fall or a sudden change in the first derivative f '(t) or as a specific value of the first derivative f' (t), corresponding to a temperature rise in an empty pot.
  • the temperature T does not rise so fast.
  • the stable frequency level during boiling (cooking) can be used as a reference level to calibrate for 100 ° C.
  • the frequency drops and the power of the cooking zone becomes at a certain relative value f1 in switched off at 100 ° C. Notwithstanding this shows Fig.
  • a frequency curve f (t) can be assigned, which changes in the region of the boiling point its previously approximately linearly sloping course in a thereafter approximately constant course and in the range of empty or dry cooking its previously approximately constant course in a thereafter approximately linearly sloping course.
  • T (t) run and the f (t) run the fast empty or dry cooking is labeled B1 and the slow empty or dry cooking is labeled B2.
  • S indicates the span f' (t) corresponding to the heating of an empty pot.
  • the temperature control could then be carried out, for example, as a thermostat function.
  • the power of the cooking zone can be set to two different levels P-high and P-low (for example P1 and P2), which are connected to two calibration curves f (T, P-high) and f (T, P-low).
  • the frequency f is then measured continuously and the temperature T derived from the calibration curves, depending on which power level is used. If the calculated temperature T-meas is greater than the set temperature T-set, the cooking zone is supplied with the lower power P-low. If T-meas is less than T-set, the cooking zone receives the higher power P-high ( Fig. 7 ). To this The pan or pot is kept at a clearly constant temperature level.
  • temperatures and / or temperature conditions and / or temperature changes and / or temperature profiles and / or their first derivatives can be assigned to frequencies and / or frequency relationships and / or frequency changes and / or their first derivatives and / or vice versa.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Frying-Pans Or Fryers (AREA)
EP10178369A 2002-11-15 2003-10-24 Procédé et dispositif de surveillance thermique d'un ustensile de cuisson chauffable inductivement Expired - Lifetime EP2271175B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002153198 DE10253198B4 (de) 2002-11-15 2002-11-15 Verfahren und Vorrichtung zur thermischen Überwachung eines induktiv erwärmbaren Gargefäßes
EP03024314.1A EP1420613B1 (fr) 2002-11-15 2003-10-24 Procédé et dispositif de surveillance thermique d'un ustensile de cuisson chauffable inductivement

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP03024314.1 Division 2003-10-24
EP03024314.1A Division-Into EP1420613B1 (fr) 2002-11-15 2003-10-24 Procédé et dispositif de surveillance thermique d'un ustensile de cuisson chauffable inductivement

Publications (3)

Publication Number Publication Date
EP2271175A2 true EP2271175A2 (fr) 2011-01-05
EP2271175A3 EP2271175A3 (fr) 2011-01-19
EP2271175B1 EP2271175B1 (fr) 2012-12-26

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Application Number Title Priority Date Filing Date
EP03024314.1A Expired - Lifetime EP1420613B1 (fr) 2002-11-15 2003-10-24 Procédé et dispositif de surveillance thermique d'un ustensile de cuisson chauffable inductivement
EP10178369A Expired - Lifetime EP2271175B1 (fr) 2002-11-15 2003-10-24 Procédé et dispositif de surveillance thermique d'un ustensile de cuisson chauffable inductivement

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EP03024314.1A Expired - Lifetime EP1420613B1 (fr) 2002-11-15 2003-10-24 Procédé et dispositif de surveillance thermique d'un ustensile de cuisson chauffable inductivement

Country Status (4)

Country Link
EP (2) EP1420613B1 (fr)
DE (2) DE10262141B4 (fr)
DK (1) DK2271175T3 (fr)
ES (1) ES2401740T3 (fr)

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EP1613939B1 (fr) * 2003-02-25 2016-04-13 MGS Modular Galley Systems GmbH Systeme et procede pour determiner des temperatures
DE102004044797B4 (de) 2004-09-16 2008-02-07 Hüttinger Elektronik GmbH & Co. KG Anregungsanordnung für Induktionsöfen
DE102005044466B4 (de) * 2005-09-16 2008-09-18 Hüttinger Elektronik Gmbh + Co. Kg Anregungsanordnung für Induktionsöfen
ES2325106B1 (es) * 2006-06-15 2010-06-01 Bsh Electrodomesticos España, S.A. Dispositivo identificador de cacerolas vacias.
DE102007036334A1 (de) * 2007-08-02 2009-02-05 Electrolux Home Products Corporation N.V. Basiseinheit zum induktiven Aufheizen und Induktionsflüssigkeitserhitzungssystem
ES2339087B1 (es) * 2008-02-22 2011-03-28 Bsh Electrodomesticos España, S.A. Campo de coccion por induccion con al menos un elemento de calentamiento por induccion y al menos un sensor de temperatura.
EP2194755B1 (fr) 2008-12-02 2016-08-03 Whirlpool Corporation Procédé pour contrôler le système de chauffage à induction d'un appareil de cuisine
ES2589136T3 (es) 2008-12-02 2016-11-10 Whirlpool Corporation Un procedimiento para controlar el sistema de calentamiento por inducción de un aparato de cocina
US20100147832A1 (en) 2008-12-16 2010-06-17 Barker Iii Charles R Induction cookware identifying
EP2224787B1 (fr) * 2009-02-26 2019-01-23 Electrolux Home Products Corporation N.V. Procédé et dispositif de contrôle d'un appareil de cuisson chauffant par induction
PL2296435T3 (pl) 2009-09-11 2015-12-31 Whirlpool Co Sposób wykrywania i kompensowania szumów w systemie grzania indukcyjnego dla kuchenki domowej i profesjonalnej oraz system grzania indukcyjnego wykorzystujący taki sposób
ITBO20090691A1 (it) * 2009-10-23 2011-04-24 Ada Applic Digitali E Analo Giche S R L Metodo e dispositivo per controllare la temperatura di un riscaldatore a induzione
EP2326140A1 (fr) 2009-11-18 2011-05-25 Whirlpool Corporation Procédé pour contrôler un système de chauffage à induction
DE102009047185B4 (de) 2009-11-26 2012-10-31 E.G.O. Elektro-Gerätebau GmbH Verfahren und Induktionsheizeinrichtung zum Ermitteln einer Temperatur eines mittels einer Induktionsheizspule erwärmten Kochgefäßbodens
CH704318B1 (de) 2011-01-07 2016-03-15 Inducs Ag Induktionskochgerät zum temperaturgesteuerten Kochen.
DE102011083383A1 (de) * 2011-09-26 2013-03-28 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Beheizen einer in einem Kochgefäß enthaltenen Flüssigkeit und Induktionsheizeinrichtung
DE102011083397A1 (de) 2011-09-26 2013-03-28 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Zubereiten von Lebensmitteln mittels einer Induktionsheizeinrichtung und Induktionsheizeinrichtung
DE102011083386A1 (de) * 2011-09-26 2013-03-28 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Beheizen eines Kochgefäßes mittels einer Induktionsheizeinrichtung und Induktionsheizeinrichtung
KR20130073477A (ko) * 2011-12-23 2013-07-03 삼성전자주식회사 유도가열조리기 및 그 제어방법
KR101981671B1 (ko) 2012-07-27 2019-05-24 삼성전자주식회사 유도가열조리기 및 그 제어방법
DE102013104107A1 (de) * 2013-04-23 2014-10-23 Cuciniale Gmbh Verfahren zur Regelung eines Garprozesses
CN104684123B (zh) * 2015-01-23 2016-07-06 九阳股份有限公司 一种电磁炉的控制方法
DE102016212330A1 (de) * 2016-07-06 2018-01-11 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Betrieb eines Kochfelds und Kochfeld
EP3300453B1 (fr) 2016-09-23 2020-08-19 Electrolux Appliances Aktiebolag Procédé de détection d'ébullition et table de cuisson à induction comprenant un mécanisme de détection d'ébullition
EP3386270B1 (fr) * 2017-04-04 2019-11-27 Electrolux Appliances Aktiebolag Procédé et système de chauffage par induction
DE102019000959A1 (de) * 2019-02-09 2020-08-13 Diehl Ako Stiftung & Co. Kg Verfahren und Vorrichtung zum Erkennen eines Siedezustandes einer Flüssigkeit
CN114190756B (zh) * 2020-09-17 2022-09-30 浙江苏泊尔家电制造有限公司 检测烹饪器具的温度检测装置装配位置的方法和烹饪器具
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Also Published As

Publication number Publication date
EP1420613A3 (fr) 2006-03-22
EP1420613A2 (fr) 2004-05-19
EP1420613B1 (fr) 2016-07-13
DE10253198A1 (de) 2004-06-24
DE10262141B4 (de) 2009-10-15
ES2401740T3 (es) 2013-04-24
EP2271175B1 (fr) 2012-12-26
EP2271175A3 (fr) 2011-01-19
DK2271175T3 (da) 2013-04-02
DE10253198B4 (de) 2007-07-05

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