EP2369896A1 - Procédé de réglage de l'alimentation de puissance pour un poste de cuisson à induction et dispositif d'exécution du procédé - Google Patents

Procédé de réglage de l'alimentation de puissance pour un poste de cuisson à induction et dispositif d'exécution du procédé Download PDF

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Publication number
EP2369896A1
EP2369896A1 EP11401039A EP11401039A EP2369896A1 EP 2369896 A1 EP2369896 A1 EP 2369896A1 EP 11401039 A EP11401039 A EP 11401039A EP 11401039 A EP11401039 A EP 11401039A EP 2369896 A1 EP2369896 A1 EP 2369896A1
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EP
European Patent Office
Prior art keywords
temperature
control means
exciter
power
change
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.)
Withdrawn
Application number
EP11401039A
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German (de)
English (en)
Inventor
Jörg Vollgraf
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.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
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 Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP2369896A1 publication Critical patent/EP2369896A1/fr
Withdrawn legal-status Critical Current

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    • 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 regulating the power supply for an induction hob to protect cookware from overheating.
  • an electromagnetic alternating field is generated during induction cooking, wherein a power of the exciter is selected by a user.
  • a temperature sensor With at least one temperature sensor, the temperature of the cooking area is detected and converted into a temperature signal.
  • the invention thus provides the problem of a method for induction cooking and a device for protecting an induction cooking so educate that on the one hand always given sufficient security against overheating and on the other hand effective heating of cookware and food in the cookware is possible.
  • the achievable with the present invention consist in particular in a sufficient protection of the cookware from overheating and the ability to heat large amounts of water quickly.
  • control means determines from the temperature signal the temporal change of the temperature signal. With the control means, the power of the exciter is then limited depending on the temperature signal and the time change of the temperature signal.
  • the method may be configured to set temperature ranges in which the temperature signal may be present. Any plausible temperature that can be reached is therefore assigned to a temperature range. For each of these temperature ranges, a maximum permissible change in the temperature signal can then be defined. In each of the temperature ranges, a maximum change in temperature must not be exceeded. In low temperature temperature ranges, for example, higher changes can be allowed than in high temperature temperature ranges. Thus, at low temperatures, a higher power can be allowed, for example, to quickly heat a pot filled with water. At high temperatures, however, only a small or limited power is allowed, depending on the time change of the temperature, to counteract the risk of overheating of the cookware.
  • the exciter's performance could be limited by the regulatory means according to the table below.
  • the corresponding temperature range is given instead of the value range of the usually electrical temperature signal.
  • temperature range Max. permissible change Max. power 30 ° C to 80 ° C 1 ° C / sec 2500 W 80 ° C to 120 ° C 0.6 ° C / sec 1500 W 120 ° C to 150 ° C 0.4 ° C / sec 600W 150 ° C to 200 ° C 0.2 ° C / sec 300w > 200 ° C 0 ° C / sec 0 W
  • control means detects the frequency of a change from operation with a limited power of the exciter to operate with user-selected power during a fixed period of time. The more frequently a change from limited power operation to operation with the power selected by the user occurs within the period of time, the more likely it is that the power has been limited without the actual danger of overheating.
  • the control means may increase the maximum allowable change in the temperature signal, as determined by the temperature ranges. To do so, the frequency of changes from limited power operation to operation with user-selected power had to exceed a set value. Such a case may occur in particular when heating a pot filled with water.
  • the control means may then evaluate the second temperature signal within fixed-length measurement cycles during limited-power exciter operation or during lower-power operation of the exciter. For this purpose, a first difference from the second temperature signal is determined at the beginning and at the end of a measurement cycle. In addition, a second difference from the second temperature signal at the beginning of the following measurement cycle and at the beginning of the aforementioned measurement cycle is determined. If both differences are present, a quotient of the first difference divided by the second difference is formed.
  • the control means may increase the maximum allowable changes associated with the regions of the temperature signal if the determined quotient exceeds a predetermined value.
  • PT 1000 temperature sensors are typically used to detect the temperature on the underside of the glass ceramic hob plate. Although the temperature detection is very accurate but, as shown for example during heating, clearly too slow to rapid temperature changes to detect and also to capture the actual temperature of the arranged on the cooking plate cookware.
  • a total of six temperature sensors are arranged at different distances from the center of the cooking zone, ie with different radius.
  • FIG. 7 shows an arrangement of the temperature sensors 1 to 6 on the induction coil, which is arranged below the glass ceramic cooking surface. The size of the induction coil defines the area of the cooking zone.
  • FIGS. 1 and 2 show the course of recorded in a trial temperatures at the bottom of a pot and at the measuring points of a cooking zone according to FIG. 7 , It can be clearly seen that the temperature sensors on the underside of the glass ceramic cooking surface in the region of the cooking zone at the beginning of a heating process, always lower temperatures than prevail in the pot bottom. The change in the temperature of the pot bottom is too fast for it to be detected by the sensors on the underside of the glass ceramic plate of the cooking surface.
  • FIG. 1 The temperature profiles shown were recorded during a heating process of the pot filled with water, in which the exciter of the induction cooker was operated at a constant power. Despite the continuous power supply, the temperature in the pot bottom does not rise above 140 ° C. The change in the temperature of the bottom of the pot is initially very high, but over time becomes smaller and smaller.
  • the situation is different when heating the empty pot.
  • the temperatures ( FIG. 2 ) in both the bottom of the pot and on the bottom of the glass ceramic plate rise quickly.
  • the temperature in the bottom of the pot rises in the experiment up to about 270 ° C.
  • the exciter of the induction cooker is switched off for safety reasons.
  • the temperature of the bottom of the pot drops due to heat transport. Part of the heat is transported into the glass ceramic plate, which is why there is a delay in an increase in the temperatures on the underside of the glass ceramic plate.
  • the temperature rise on the underside of the glass ceramic plate is much faster despite the switching off of the exciter than when heating a pot filled with water, as in FIG. 1 is shown.
  • FIG. 5 show the temperature and performance curves for heating an empty or filled with water pot, in which an inventive limitation of the power takes place. It can be clearly seen, as with the empty pot (see FIG. 5 ) the initially high power is gradually reduced to zero and the increase in temperature in the bottom of the pot is reduced from stage to stage.
  • FIG. 8 shows a possible alternative arrangement of temperature sensors on the induction coil.
  • the blackened fields show the preferred arrangement of three sensors on the induction coil.
  • the other fields (not blackened) can be provided arbitrarily for the arrangement of further sensors.
  • the method according to the invention for regulating the power supply for an induction cooking station is designed in such a way that an alternating electromagnetic field is generated by a user whose power is selected by a user, with at least one first temperature sensor detecting the temperature of the cooking point in the region of a first measuring point and the temperature is converted into a temperature signal. With at least one further temperature sensor, the temperature of the cooking area is detected in the range of another measuring point and converted into a temperature signal, wherein the time change of the temperature signals is determined by a control means from the temperature signals and the power in dependence on the temperature signals and the temporal change of the temperature signals of the pathogen is limited.
  • the temperature ranges in which the temperature signals can be, are fixed, with a maximum allowable change in the temperature signals is set for each temperature range.
  • the power of the exciter is limited by the control means according to the table below, where the temperature is given in the table instead of the temperature signal: temperature range Max. permissible change Max. power 30 ° C to 80 ° C 1% ° C sec 2500 W 80 ° C to 120 ° C 0.6 ° C / sec 1500 W 120 ° C to 150 ° C 0.4 ° C / sec 600W 150 ° C to 200 ° C 0.2 ° C / sec 300w > 200 ° C 0 ° C / sec 0 W
  • the control means detects the frequency of a change from operation with a limited power of the exciter to operate with user-selected power during a predetermined period of time.
  • the control means increases the maximum permissible changes in the temperature ranges if the frequency of the changes exceeds a specified value.
  • a sensor senses an electrical quantity in the exciter or device of the exciter to supply electrical energy that correlates to the temperature of the bottom of the cookware, and converts it into a second temperature signal.
  • the control means evaluates the second temperature signal within fixed length measurement cycles during operation of the limited power exciter or during low impulse energizer operation by determining a first difference from the second temperature signal at the beginning and end of a measurement cycle , determines a second difference of the second temperature signal at the beginning of the following measurement cycle and at the beginning of the first measurement cycle and forms a quotient of the first difference divided by the second difference.
  • the rule means increases the maximum permissible changes if the determined quotient exceeds a specified value. For example, the maximum permissible changes are increased by a factor of approximately 1.5.
  • the device for carrying out the method according to the invention has a first and at least one further temperature sensor in the region of the cooking zone for detecting the temperature of the cooking point and for converting the temperature into a temperature signal.
  • the device comprises a control means for determining the temporal change of the temperature signals from the temperature signals and for limiting the power of the exciter in response to the temperature signals and the temporal change of the temperature signals.
  • the first and at least one further temperature sensor are arranged in the region of the cooking zone below the glass ceramic cooking surface.
  • the temperature sensors are preferably arranged on the induction coil.
  • the temperature sensors are each arranged at different radii relative to the center of the induction coil.
  • a hob for carrying out the method according to the invention has one or more induction cookers, of which at least one cooking point has such a device.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
EP11401039A 2010-03-24 2011-03-08 Procédé de réglage de l'alimentation de puissance pour un poste de cuisson à induction et dispositif d'exécution du procédé Withdrawn EP2369896A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010016110 DE102010016110B4 (de) 2010-03-24 2010-03-24 Verfahren zur Regelung der Leistungszufuhr für eine Induktions-Kochstelle und Vorrichtung zur Durchführung des Verfahrens

Publications (1)

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EP2369896A1 true EP2369896A1 (fr) 2011-09-28

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EP11401039A Withdrawn EP2369896A1 (fr) 2010-03-24 2011-03-08 Procédé de réglage de l'alimentation de puissance pour un poste de cuisson à induction et dispositif d'exécution du procédé

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EP (1) EP2369896A1 (fr)
DE (1) DE102010016110B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111107681A (zh) * 2018-10-26 2020-05-05 佛山市顺德区美的电热电器制造有限公司 烧水控制方法及装置、存储介质及电磁加热设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113993237B (zh) * 2021-10-15 2024-06-28 深圳拓邦股份有限公司 一种电磁炉功率调节方法、装置及电磁炉

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781506A (en) 1972-07-28 1973-12-25 Gen Electric Non-contacting temperature measurement of inductively heated utensil and other objects
EP1489479A1 (fr) * 2003-06-16 2004-12-22 Ceramaspeed Limited Appareil et méthode pour la détection de montée anormale en température dans un appareil de cuisson
DE102006057885A1 (de) 2006-12-01 2008-06-05 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Erzeugen, Verarbeiten und Auswerten eines mit der Temperatur korrelierten Signals und entsprechende Vorrichtung
DE102007012379A1 (de) 2007-03-14 2008-09-18 BSH Bosch und Siemens Hausgeräte GmbH Kochfeldvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3530403A1 (de) * 1985-04-06 1986-10-16 Philips Patentverwaltung Verfahren zum automatischen regeln des ankochheizvorganges einer kochvorrichtung
US6462316B1 (en) * 2000-10-10 2002-10-08 General Electric Company Cooktop control and monitoring system including detecting properties of a utensil and its contents
DE102006022327A1 (de) * 2006-05-12 2007-11-15 BSH Bosch und Siemens Hausgeräte GmbH Vorrichtung und Verfahren zur Steuerung und/oder Regelung einer Heizleistung eines Heizelements einer Kochmulde

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781506A (en) 1972-07-28 1973-12-25 Gen Electric Non-contacting temperature measurement of inductively heated utensil and other objects
EP1489479A1 (fr) * 2003-06-16 2004-12-22 Ceramaspeed Limited Appareil et méthode pour la détection de montée anormale en température dans un appareil de cuisson
DE102006057885A1 (de) 2006-12-01 2008-06-05 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Erzeugen, Verarbeiten und Auswerten eines mit der Temperatur korrelierten Signals und entsprechende Vorrichtung
DE102007012379A1 (de) 2007-03-14 2008-09-18 BSH Bosch und Siemens Hausgeräte GmbH Kochfeldvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111107681A (zh) * 2018-10-26 2020-05-05 佛山市顺德区美的电热电器制造有限公司 烧水控制方法及装置、存储介质及电磁加热设备

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DE102010016110B4 (de) 2014-06-12
DE102010016110A1 (de) 2011-09-29

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