EP2574145A2 - Procédé de préparation d'aliments au moyen d'un dispositif de chauffage à induction et dispositif de chauffage à induction - Google Patents

Procédé de préparation d'aliments au moyen d'un dispositif de chauffage à induction et dispositif de chauffage à induction Download PDF

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Publication number
EP2574145A2
EP2574145A2 EP12185400A EP12185400A EP2574145A2 EP 2574145 A2 EP2574145 A2 EP 2574145A2 EP 12185400 A EP12185400 A EP 12185400A EP 12185400 A EP12185400 A EP 12185400A EP 2574145 A2 EP2574145 A2 EP 2574145A2
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EP
European Patent Office
Prior art keywords
parameter value
resonant circuit
period
phase
induction heating
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
EP12185400A
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German (de)
English (en)
Other versions
EP2574145B1 (fr
EP2574145A3 (fr
Inventor
Wilfried Schilling
Christian Egenter
Werner Kappes
Stefan Westrich
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EGO Elektro Geratebau GmbH
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EGO Elektro Geratebau GmbH
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Priority to PL12185400T priority Critical patent/PL2574145T3/pl
Publication of EP2574145A2 publication Critical patent/EP2574145A2/fr
Publication of EP2574145A3 publication Critical patent/EP2574145A3/fr
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Publication of EP2574145B1 publication Critical patent/EP2574145B1/fr
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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 process for preparing food cooked in a liquid contained in a cooking vessel by means of an induction heating device and an induction heating device for carrying out the process.
  • In Indutationsloom acquired an alternating magnetic field is generated by means of an induction heating, which induces eddy currents in a heated cooking vessel with a bottom of ferromagnetic material and causes loss of magnetization, whereby the cooking vessel is heated.
  • the induction heating coil is part of a resonant circuit comprising the induction heating coil and one or more capacitors.
  • the induction heating coil is usually designed as a flat, spirally wound coil with associated ferrite cores and arranged, for example, under a glass ceramic surface of an induction hob.
  • the induction heating coil forms an inductive and a resistive part of the resonant circuit in conjunction with the cookware to be heated.
  • a low-frequency AC mains voltage is first rectified with a mains frequency of, for example, 50 Hz or 60 Hz and then converted by means of semiconductor switches into an excitation or drive signal of higher frequency.
  • the excitation signal or the drive voltage is usually a square-wave voltage with a frequency in a range from 20 kHz to 50 kHz.
  • a circuit for generating the excitation signal is also referred to as a (frequency) converter.
  • a frequency of the excitation signal or of the rectangular voltage is changed as a function of the heat output to be delivered or fed in or of the desired power consumption.
  • This method for adjusting the heating power output makes use of the fact that with a stimulation of the resonant circuit with its resonant frequency, a maximum heat output occurs. The greater the difference between the frequency of the excitation signal and the resonant frequency of the resonant circuit, the smaller the output of heating power.
  • the induction heating device has a plurality of oscillation circuits, for example, if the induction heating device forms an induction hob with different induction cookers and different heating powers are set for the oscillating circuits, beats may be caused by superimposing the different frequencies of the excitation signals, which may lead to disturbing noises.
  • a method for heating power adjustment which avoids noise due to such beats, is a pulse width modulation of the excitation signal at constant excitation frequency, in which an effective value of a heating power is adjusted by changing the pulse width of the excitation signal.
  • RMS control by changing the pulse width at a constant excitation frequency, however, high on and off currents in the semiconductor switches, whereby a broadband and high-energy interference spectrum is caused.
  • the DE 10 2009 047 185 A1 discloses a method and an induction heater in which temperature dependent ferromagnetic properties of the cooking vessel bottom are measured at high resolution and evaluated to determine the temperature of the cooking vessel bottom.
  • the invention has for its object to provide a method for preparing foods that are cooked in a liquid contained in a cooking vessel by means of an induction heater and a Induction heating device for performing the method to provide, in particular based on the in the DE 10 2009 047 185 A1 disclosed measuring principle, a reliable temperature-controlled or temperature-controlled cooking allow, in particular by reliably determining a boiling point.
  • the invention achieves this object by a method having the features of claim 1 and an induction heating device having the features of claim 6.
  • the method is used to prepare foods, such as rice, which are cooked in a liquid contained in a cooking vessel, such as water, broth, etc., by means of an induction heating device comprising a resonant circuit with an induction heating coil.
  • a parameter value of the resonant circuit is continuously or periodically determined, in particular a natural resonant frequency of the resonant circuit or a period associated with the natural resonant frequency.
  • the parameter is dependent on a temperature of the cooking vessel, in particular the cooking vessel bottom.
  • the resonant circuit is subjected to a high-frequency square-wave voltage. This serves to feed the heating power into the cooking vessel, in particular into the cooking vessel bottom, with a predefinable heating power setpoint.
  • the heating power setpoint is changed periodically. Within a respective period of the Schundssollwertver selectedung the Schundssollwert is set during a first period, for example about 48 seconds, to a first value. During a remaining duration, ie period duration of the heating power setpoint change minus first duration, for example 12 seconds, the heating power setpoint is set to a second, smaller value.
  • the period of the Wien elegantssollwertver baseung can be for example 60 seconds.
  • the period can be constant or variable.
  • a change in the parameter value is determined within the period of the Wien elaboratessollwertver selectedung, in particular during the remaining duration within the period of the Bank elaboratessollwertver selectedung at a smaller setpoint.
  • the determined change in the parameter value is evaluated to determine the boiling point of the liquid.
  • the heating phase is ended when the boiling point has been determined.
  • a boiling point is determined when evaluating the determined change in the parameter value if the change in the parameter value falls below a predefined level.
  • a continuing cooking phase is carried out, with the following steps: applying a heating power setpoint, which corresponds in particular to 5% to 50%, preferably 10% to 20%, of a maximum heating power setpoint to the oscillating circuit with the high-frequency square-wave voltage. whether the parameter value changes by more than a predefined amount within a monitoring period, and if the parameter value changes by more than the specified amount within the monitoring period, ending the cooking phase.
  • a heating power setpoint which corresponds in particular to 5% to 50%, preferably 10% to 20%
  • an instantaneous parameter value is stored and a warming-up phase is carried out after the end of the continuing cooking phase, with the steps of: regulating the parameter value to a parameter setpoint which depends on the stored parameter value is determined, for example, by subtracting a predetermined offset value.
  • a continuing cooking phase is carried out.
  • the cooking phase comprises the steps of: controlling the parameter value to a parameter setpoint determined as a function of the stored parameter value, monitoring a heat output to be applied to the control, and if the heating power to be applied is below a predetermined level, stopping the boiling phase.
  • the warming up phase can be followed by a warming up phase.
  • the induction heater includes: a resonant circuit having an induction heating coil and a controller configured to perform the above-mentioned method.
  • Fig. 1 schematically shows an induction heater 9 with a resonant circuit 4, which has a Indu mecanicsmosspule 1 and capacitors 2 and 3, and a power unit 7, controlled by a control device 8 conventionally rectified a low-frequency mains AC voltage UN with a mains frequency of 50Hz, for example, and then by means not shown semiconductor switches in a square wave voltage UR with a frequency in a range of 20kHz to 50kHz converts, wherein the resonant circuit 4 and the induction heating coil 1 is applied to the square wave UR to feed heating power in a ferromagnetic bottom of a cooking vessel 5, wherein in the cooking vessel water. 6 is in the rice 10 in a ratio of 2: 1 is provided.
  • the capacitors 2 and 3 are conventionally looped in series between poles UZK + and UZK- an intermediate circuit voltage, wherein a connection node of the capacitors 2 and 3 is connected to a terminal of the induction heating coil 1.
  • the induction heating device 9 has measuring means (not shown in greater detail) which provide a continuous or periodic determination of a parameter value of the oscillating circuit 4 in the form of a period Tp (see FIG Fig. 2 ) allow a self-resonant oscillation of the resonant circuit 4, wherein the period Tp of the temperature of the cooking vessel bottom is dependent, that also increases with increasing temperature, since with increasing temperature of the cooking vessel bottom, the effective inductance increases, so that the resonant frequency decreases and correspondingly increases the period.
  • the period Tp can be determined for example by means of a timer of a microcontroller.
  • the measuring method and the heating power setting is also on the DE 10 2009 047 185 A1 Reference is hereby made to the content of the description to avoid repetition.
  • Fig. 2 shows time curves of a heating power setpoint SW in 0.5% of a nominal heating capacity of Fig. 1 shown induction heater 9 and the period Tp of a self-resonant oscillation of the resonant circuit. 4
  • the control device 8 continuously or periodically determines the period Tp of a self-resonant oscillation of the resonant circuit 4, for which purpose the heating power supply is temporarily interrupted and switched over to self-resonant operation of the resonant circuit 4. Due to the low temporal resolution, these phases are in Fig. 2 not shown.
  • a time interval I which forms a heating-up phase or a heating-up phase
  • the resonant circuit 4 is supplied with a high-frequency square-wave voltage UR for heating-power feed into the cooking-vessel bottom, the associated heating-output setpoint SW changing periodically.
  • a first duration for example 48 seconds
  • a first value for example corresponding to 100% of the nominal heating power
  • a remaining duration for example 12 seconds
  • a second, smaller value is set, for example corresponding to 10 % of nominal heating capacity.
  • the control device 8 determines within the period P a change in the period Tp, in particular during which the smaller set value is set, and determines a boiling point when the change of the period Tp falls below a predetermined level.
  • the heating power setpoint is approx. 10% to 20% of a maximum heating power setpoint. It is monitored whether the period Tp changes within a monitoring period, for example 10 seconds, by more than a predetermined amount, which may be caused, for example, by the fact that after the water 6 has been taken up or evaporated from the rice 10, the soil temperature is relatively high rising rapidly.
  • the cooking phase II is then terminated and it follows a holding phase III, during which the period Tp is controlled to a desired value, which is determined in response to a set immediately after the determination of the boiling point period Tp by a predetermined value of this value Offset value is subtracted.
  • a period Tp is stored as a setpoint.
  • the period Tp is then regulated to this setpoint.
  • the heat output to be applied to the control system is monitored and if the heat output to be used falls below a predetermined level, the cooking phase is ended.
  • the warming up phase can be followed by a warming up phase.
  • Rice 10 can be prepared by the so-called swelling method. For this purpose, a lot of rice 10 with an amount of water 6, for example in a ratio of 1: 2, brought to a boil and cooked until the water 6 is completely absorbed or evaporated by the rice 10. The cooking performance is adjusted so that very little water evaporates. With the cooking system 9 described above, this process is very easy to automate.
  • the process can be divided into 3 phases: heating, cooking and recognizing cooking.
  • a cooking program that depicts the three phases requires the functions boiling with boiling point detection, cooking with temperature monitoring and cooking detection.
  • the heating power is periodically, for example every minute, for example, reduced for 12 seconds and measured the temperature profile or the course of the representative period Tp on the bottom of the pot.
  • the amplitude of the temperature change by the power variation decreases with increasing water temperature to assume a constant value after reaching the boiling point. This property can be used to detect the boiling state.
  • the power is reduced to continued cooking power, for example 10% to 20% of the nominal power, and the temperature is constantly monitored. After the water has been absorbed or evaporated by the rice, the soil temperature rises relatively quickly. This increase is detected and a ready signal can be given to a user.
  • the setpoint temperature can be set to a suitable holding temperature, for example 80-90 ° C, and controlled by means of a negative offset.
  • parameter value of the resonant circuit in the form of the period Tp other / additional parameter values can be used, for example, an amplitude of a resonant circuit voltage, a voltage across the induction heating coil, an amplitude of a resonant circuit current and / or a phase shift between the resonant circuit voltage and the resonant circuit current.
  • the invention may also find application in the context of a parallel resonant circuit or a series resonant circuit with full bridge drive.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
  • Induction Heating Cooking Devices (AREA)
EP12185400.4A 2011-09-26 2012-09-21 Procédé de préparation d'aliments au moyen d'un dispositif de chauffage à induction et dispositif de chauffage à induction Active EP2574145B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12185400T PL2574145T3 (pl) 2011-09-26 2012-09-21 Sposób przygotowywania żywności za pomocą indukcyjnego urządzenia grzejnego i indukcyjne urządzenie grzejne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011083397A DE102011083397A1 (de) 2011-09-26 2011-09-26 Verfahren zum Zubereiten von Lebensmitteln mittels einer Induktionsheizeinrichtung und Induktionsheizeinrichtung

Publications (3)

Publication Number Publication Date
EP2574145A2 true EP2574145A2 (fr) 2013-03-27
EP2574145A3 EP2574145A3 (fr) 2013-07-17
EP2574145B1 EP2574145B1 (fr) 2015-07-08

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EP12185400.4A Active EP2574145B1 (fr) 2011-09-26 2012-09-21 Procédé de préparation d'aliments au moyen d'un dispositif de chauffage à induction et dispositif de chauffage à induction

Country Status (7)

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US (1) US9491807B2 (fr)
EP (1) EP2574145B1 (fr)
JP (1) JP6110619B2 (fr)
CN (1) CN103052194B (fr)
DE (1) DE102011083397A1 (fr)
ES (1) ES2547206T3 (fr)
PL (1) PL2574145T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110493906A (zh) * 2019-08-30 2019-11-22 九阳股份有限公司 一种电磁加热系统的辐射控制方法及电磁加热系统

Families Citing this family (9)

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DE102015216455A1 (de) 2015-08-27 2017-03-02 E.G.O. Elektro-Gerätebau GmbH Verfahren zur Temperaturbestimmung
ES2975178T3 (es) 2015-12-02 2024-07-03 Ego Elektro Geraetebau Gmbh Método de funcionamiento de una encimera de cocción por inducción
DE102016219590A1 (de) 2016-10-10 2018-04-12 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Betrieb eines Induktionskochfelds und Induktionskochfeld
CN107990995A (zh) * 2017-12-06 2018-05-04 王宝彬 一种测量评估电磁锅锅体温度的方法
CN111385927B (zh) * 2018-12-29 2022-04-29 佛山市顺德区美的电热电器制造有限公司 电磁加热器具及其控制方法和控制装置
CN112710412B (zh) * 2019-10-25 2023-11-03 佛山市顺德区美的电热电器制造有限公司 电磁加热设备及其锅具标定方法和装置
KR20210072437A (ko) * 2019-12-09 2021-06-17 엘지전자 주식회사 조리기기
CN111728466B (zh) * 2020-06-11 2022-04-12 广东美的厨房电器制造有限公司 烹饪电器的控制方法、烹饪电器和计算机可读存储介质
CN114027706B (zh) * 2021-10-29 2023-06-27 添可智能科技有限公司 智能烹饪设备控制方法及智能烹饪设备

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Publication number Priority date Publication date Assignee Title
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Also Published As

Publication number Publication date
PL2574145T3 (pl) 2016-01-29
JP6110619B2 (ja) 2017-04-05
JP2013073937A (ja) 2013-04-22
EP2574145B1 (fr) 2015-07-08
ES2547206T3 (es) 2015-10-02
CN103052194B (zh) 2016-02-17
US20130078346A1 (en) 2013-03-28
EP2574145A3 (fr) 2013-07-17
US9491807B2 (en) 2016-11-08
CN103052194A (zh) 2013-04-17
DE102011083397A1 (de) 2013-03-28

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