EP1897414B1 - Dispositif pour monter en température un élément chauffant - Google Patents

Dispositif pour monter en température un élément chauffant Download PDF

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Publication number
EP1897414B1
EP1897414B1 EP06754805A EP06754805A EP1897414B1 EP 1897414 B1 EP1897414 B1 EP 1897414B1 EP 06754805 A EP06754805 A EP 06754805A EP 06754805 A EP06754805 A EP 06754805A EP 1897414 B1 EP1897414 B1 EP 1897414B1
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EP
European Patent Office
Prior art keywords
value
correction
temperature
guide
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.)
Active
Application number
EP06754805A
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German (de)
English (en)
Other versions
EP1897414A1 (fr
Inventor
Dirk Hoffmann
Jochen Bühner
José Miguel Burdio Pinilla
Jose Ramon Garcia Jiménez
Pablo Jesus Hernandez Blasco
Sergio Llorente Gil
Alfonso Lorente Perez
Fernando Monterde Aznar
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
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Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1897414A1 publication Critical patent/EP1897414A1/fr
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Publication of EP1897414B1 publication Critical patent/EP1897414B1/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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power

Definitions

  • the invention relates to a device for in particular inductive heating of a heating element according to the preamble of claim 1.
  • a temperature control for an induction cooker in which an operator can start the control at a desired time by entering a corresponding command.
  • a control unit registers a value of a controlled variable associated with the temperature of a cooking vessel at this starting time and regulates the power of the inductor so that the controlled variable remains as close as possible to this guide value.
  • the controlled variable of the temperature control is derived from an electrical variable of the inductor of the induction cooker. If, for example, water in the cooking container begins to boil easily after the cooking container has been heated up, the operator can continue to simmer the water as desired by starting the regulation process.
  • a circuit is known by means of which a cooking state can be detected regardless of the type of cooking vessel.
  • a correction unit is provided which corrects the temperature in response to the material of the cooking container.
  • the US 3,781,506 shows a cooking appliance with a circuit by means of which a non-contact measurement of inductively heated cooking appliances is possible.
  • the invention relates to a device for heating a heating element, in particular with an inductor, a radiant heater or a gas burner, and a means for detecting a dependent of a temperature of the heating element and derived from an electrical variable of the inductor reference variable to form a guide value from the reference variable and for regulating the temperature by means of the regulation of the reference variable with the aid of the reference value.
  • the correction means is prepared to change the command value to a correction command at a time point (t 1 ) which is after a time point (t 0 ) of the start of a heating operation to change a correction value.
  • the guide value can be manually corrected by an operator or automatically or adapted to new needs, so that a uniform maintenance of a desired temperature can be achieved in a simple manner.
  • a heating element dependent on the temperature of the guide variable which is derived from an electrical size of the inductor, usually correlates with the temperature of only a very thin layer of the heating element, for example, a pot bottom, which faces the inductor. The temperature of this thin layer does not necessarily match the temperature of, for example, food or water in the pot.
  • the bottom of the pot In a rapid heating of the pot by a large supplied heating power, for example, the bottom of the pot, especially the bottom layer of the pot bottom, already much hotter than the boiling point of the water when the water begins to boil.
  • the guide value is formed from the reference variable and the reference variable is kept as close as possible to the guide value, it may be that the pot bottom is kept at a very hot temperature to strongly bubble the initially simmering water begins and an operator wants to reduce the supplied heating power.
  • the correction means can be used to correct the management value and to regulate the reference variable with the aid of the new management value, in particular to the new management value.
  • the device z.
  • a radiant heater or a gas burner As a radiant heater or a gas burner.
  • the reference variable may also depend on the power of the inductor.
  • the command variable may vary widely and the temperature control may be unreliable and undesirable.
  • a correction of the guide value for example, after a settling of the heating system, in a simple manner, a reliable temperature control can be achieved.
  • the acquisition of the reference variable can be done by measuring and / or calculating.
  • the value of the reference variable at a fixed time for example, the start time
  • the means for detecting the reference variable may include the correction means.
  • a control unit for example a microcontroller, contains both the means for detecting the reference variable and the correction means.
  • the correction means may be an adjusting means for adjusting the guidance value to a new condition or a new condition.
  • the reference variable can be used as a controlled variable. It is expediently regulated to the management value.
  • the leader value may be constant over time or a function of time.
  • the correction means is prepared to change the guide value by a correction value in response to a correction command.
  • the guide value is thereby corrected in discrete steps, whereby the correction per se, the correction of the correction and the handling by an operator are kept simple.
  • the correction means comprises an input means for inputting a correction command by an operator to correct the command value.
  • the guide value and thus the temperature control can be easily adapted manually and reliably to the needs of the operator.
  • the correction means is prepared to automatically correct the guide value at the beginning of the temperature control, in particular in order to change a correction value.
  • This correction is particularly useful for systematic errors, which are caused for example by a dependence of the reference variable of the power of the inductor.
  • the guide value can be calculated at the beginning of the temperature control and then corrected. It is also possible for the guide value to be determined at the beginning of the temperature control on the basis of an already corrected calculation or from the corrected reference variable, without it having previously been determined uncorrected.
  • the start of the temperature control can be automatic or based on an operator command.
  • a particularly simple correction is made when the correction value is a preset value.
  • the correction value may be an absolute value or a relative value, which depends, for example, on the size of the reference variable. If the correction value is dependent on the reference variable as a preset or non-preset value, a particularly user-friendly correction can be achieved since multiple corrections can be avoided. For example, at a high temperature of the heating element, the correction value may be greater than at a low temperature. Even with a high power of the inductor to start the temperature control, a higher correction value can be selected than at a lower power.
  • the correction value is dependent on a heating parameter determined before the control, for example the heating power, the temperature of the heating element or, for example, a temperature gradient of the heating element.
  • a heating parameter determined before the control for example the heating power, the temperature of the heating element or, for example, a temperature gradient of the heating element.
  • This can be corrected very quickly and a multiple correction can be avoided.
  • a rapid and effective correction can also be achieved by the fact that the correction value is dependent on a determined property of a food to be heated. If, for example, a lot of water - also referred to below as food to be cooked - in the pot to be heated, the correction value can be made large, and with little water, this can be chosen small.
  • the correction means is prepared to correct the command value after a signal start to start the temperature control and to form the command value from the corrected command value. This allows the Device before determining the management value from an extreme situation, such as the application of maximum power, led out and brought to the state that it has during the temperature control.
  • the command value may be formed of a command value determined at a state at least similar to the state during the temperature control, and a systematic error in the determination of the command value may be corrected and a reliable temperature control may be achieved.
  • the state of the device can be led out of an extreme state when the correction z.
  • B. comprises a reduction of the power of the inductor to an intermediate value.
  • An intermediate value is to be understood as a power value that lies behind the start signal and before the control phase in terms of time.
  • the intermediate value is advantageously a value already set before the start signal, whereby a very simple correction is achieved.
  • a particularly effective correction can be achieved if the intermediate value substantially corresponds to the power required to maintain a desired temperature of the heating element, in particular the temperature which the heating element has at the start signal.
  • the state of the device in the determination of the guide value is similar to the state that it assumes during the control, so that a dependence of the reference variable of, for example, the performance of the inductor as a trigger for a systematic error can be largely overcome.
  • FIG. 1 shows a device 2 for inductive heating of a heating element 4 in the form of a pot bottom of a pot 6.
  • a control unit 12 Connected to the inductor 10 is a control unit 12, which comprises a means 14 for detecting a dependent of a temperature of the heating element 4 and derived from an electrical variable of the inductor 10 reference variable.
  • the device 2 also has a correction means 16 comprising parts of the control unit 12 and an input means 18 for inputting a correction command by an operator.
  • the input means 18 has two keys 20 with which a guide value formed by the control unit 12 - and thus a target temperature of the heating element 4 - can be corrected upward or downward.
  • a radiant heater or a gas burner can be assigned as a heat source.
  • the means 14 may be formed on a above or below the support plate 8 second-order temperature sensor.
  • the measured temperature forms the reference variable F; it may deviate more or less from the actual temperature T of the pot 6.
  • FIG. 2 shows a diagram in which the temperature T H of the heating element 4 is plotted against an inductive heating over the time t. Also, the temperature T W of water over the time t is applied, which is heated in the pot 6 by the heating of the heating element 4 with. The temperature T W in this case indicates the temperature T W of the lowermost water layer in the pot 6, which is adjacent to the heating element 4. Overlying layers of water are slightly colder when the water is heated. With a thick solid line is in FIG. 2 the heating power P of the inductor 10 plotted against the time t. In addition, a reference variable F is plotted against the time t, which is detected from the inductance of the system with the inductor 10 and the heating element 4 and in particular from the current flow through the inductor 10 from the means 14.
  • both the heating element 4 and the water above it for example, room temperature.
  • the heating power P is switched to a relatively high level, the heating element 4 is heated and with him - delayed in time - the water located above the heating element 4.
  • the temperature T H increases, the inductance of the system comprising the heating element 4 and thus also the reference variable F decrease.
  • the water has reached the temperature T 1 that an operator wishes to hold. For example, the water has started to boil easily.
  • the operator By simultaneously pressing the two buttons 20, the operator generates a start signal for starting a temperature control.
  • the reference variable F and with it the temperature T H of the heating element 4
  • the heating element 4 is maintained at a constant level in order to keep the water above it at a constant temperature level.
  • the heating element 4 in its lowest and most relevant for the detection of the reference variable layer temperature T 2 , which is for example at 115 ° C and thus not insignificant above the temperature T 1 of 100 ° C of the water. If the heating element 4 were now kept constant at the temperature T 2 of 115 ° C, the heating element 4 would continue to give off heat to the water as in the heating process, and the water would be heated to a greater degree and finally bubble strongly.
  • the control method is started as follows:
  • the reference variable F has fallen very far at time t 1 and has reached a reference value F 1 which can be detected by the means 14 or derived from the reference variable F.
  • the reference value F 1 is raised by the correction means 16 by a preset correction value F K1 to a new reference value F 2 .
  • the reference variable F is now controlled to the new reference value F 2 by the heating power P of the inductor 10 is greatly reduced.
  • the heating element 4 cools down from the temperature T 2 of 115 ° C to the temperature T 3 , for example, 107 ° C down.
  • the water temperature T W still oscillates slightly above the temperature T 1 , since a certain amount of heat of high temperature T H is still stored in the heating element 4 and is released to the water.
  • the lower layer of water now cools slowly and, for example, drops below the temperature T 1 set by the operator as the desired temperature, the water stops to boil and is perceived by the operator to be too cold .
  • this triggers a correction of the guide value F 2 by a new, preset correction value F K2 to a new command value F 3 .
  • the temperature T H of the heating element 4 is adjusted to a slightly higher temperature T 4 , whereby the water is slightly heated, reaches the desired temperature T 1 and, for example, slightly simmer again.
  • FIG. 3 shows that as in FIG. 2 illustrated control method, the pot 6, however, unlike FIG. 2 contains a considerably larger amount of water.
  • the reference value F 1 is corrected by a correction value F K3 to the new reference value F 2 , which is greater than the correction value F K1 FIG.
  • the correction value F K3 was set in dependence on the amount of water.
  • the temperature T W of the water by the mixing of the water below the desired temperature T 1 , and the operator corrects the temperature T H by pressing the button 20 with the "+" at time t 2 after.
  • the command value F 2 is corrected by a correction value F K4 to a new command value F 3 , wherein the correction value F K4 , due to the large amount of water, is greater than the correction value F K2 FIG. 2
  • the correction values F K3 and F K4 are large depending on the reference variable F and, for example, high in the selection of a high temperature T 1 by an operator and small at a low temperature T 1 .
  • FIG. 4 shows another performed by the device for inductive heating of the heating element 4, which is the same as the method until the time t 1 , at which the operator presses the two buttons 20 simultaneously and triggers the start signal FIG. 2 , How to FIG. 2 described, the heating power P of the inductor 10 is strongly withdrawn after the start signal to terminate the heating process of the water.
  • the systematic error may occur that the reference variable F depends on the heating power P of the inductor 10.
  • FIG. 4 is shown a dependence of the reference variable F of the heating power P, in which the reference variable F also drops when the heating power P drops.
  • the means 14 or the control unit 12 will reduce the reference variable F dropped to a value F 4 by the drop of the heating power P from the command value F 1 Guide value F 1 up, as in FIG. 4 is shown. This is associated with a lowering of the temperature T H of the heating element 4 from the temperature T 2 to the temperature T 3 , whereby the water cools strongly and rapidly drops below the desired temperature T 1 .
  • this systematic error can be corrected manually.
  • FIG. 5 a method is shown by which in FIG. 4 counteracted systematic error is counteracted.
  • the guide value F 1 is not formed immediately after the start signal, but the heating power P is first reduced to an intermediate value P Z and held there for a little while until time t 2 .
  • the reference variable F decreases to the value F 4 and increases until the time t 2 - due to a cooling of the heating element 4 from the temperature T 2 to the temperature T 3 - easily.
  • the entire system can settle from the heating state before the time t 1 in a less dynamic state, wherein the guide value F 3 is formed only at time t 2 and the reference variable F is adjusted to this guide value F 3 .
  • the water which has become too cool after a brief further heating by residual heat in the heating element 4 and a cooling by mixing in the pot 6, is hereby again guided to the desired temperature T 1 .
  • the intermediate value P Z is chosen to be substantially equal to the power required to maintain a desired temperature T 1 , as in FIG. 5 is shown. Alternatively, it is possible to set the intermediate value P Z to a value already set before the start signal, whereby the control is particularly simple.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
  • General Induction Heating (AREA)

Claims (12)

  1. Dispositif (2) destiné à échauffer un élément de chauffe (4), notamment comprenant un inducteur (10), un corps de chauffe par rayonnement ou un brûleur à gaz et un moyen (14) de saisie d'une grandeur de guidage (F) dépendant d'une température (TH) de l'élément de chauffe (4) destiné à former une valeur de guidage (F1, F2, F3) à partir de la grandeur de guidage (F) et destiné à régler la température (TH) au moyen de la régulation de la grandeur de guidage (F) à l'aide de la valeur de guidage (F1, F2, F3), et comprenant un moyen de correction (16) pour corriger la valeur de guidage (F1, F2), caractérisé en ce que le moyen de correction (16) est préparé pour modifier la valeur de guidage (F1, F2), suite à une instruction de correction, à un moment (t1), lequel est situé après un moment (t0) du début d'une opération de chauffe, d'une valeur de correction (FK1, FK2, FK3, FK4).
  2. Dispositif (2) selon la revendication 1, caractérisé en ce que le moyen de correction (16) présente un moyen d'entrée (18) pour l'entrée d'une instruction de correction par un opérateur pour la correction de la valeur de guidage (F1, F2).
  3. Dispositif (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que le moyen de correction (16) est préparé pour corriger automatiquement la valeur de guidage (F1) au début de la régulation de température, notamment pour modifier une valeur de correction (FK1).
  4. Dispositif (2) selon la revendication 3, caractérisé en ce que la valeur de correction (FK1, FK2) est une valeur prédéfinie.
  5. Dispositif (2) selon l'une quelconque des revendications 3 ou 4, caractérisé en ce que valeur de correction (FK3, FK4) est fonction de la grandeur de guidage (F).
  6. Dispositif (2) selon l'une quelconque des revendications 3 à 5, caractérisé en ce que la valeur de correction (FK3, FK4) est fonction d'un paramètre de chauffe déterminé avant la régulation.
  7. Dispositif (2) selon l'une quelconque des revendications 3 à 6, caractérisé en ce que valeur de correction (FK3, FK4) est fonction d'une caractéristique déterminée d'une marchandise à échauffer.
  8. Dispositif (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que le moyen de correction (16) est préparé pour corriger la valeur de guidage (F) après un signal de départ destiné à démarrer la régulation de la température et pour former la valeur de guidage (F3) à partir de la grandeur de guidage corrigée (F).
  9. Dispositif (2) selon la revendication 8, caractérisé en ce que la correction comprend une diminution de la puissance de chauffe (P) pour l'élément de chauffe (4) à une valeur intermédiaire (Pz).
  10. Dispositif (2) selon la revendication 9, caractérisé en ce que la valeur intermédiaire (Pz) est une valeur déterminée avant le signal de départ.
  11. Dispositif (2) selon la revendication 9 ou 10, caractérisé en ce que la valeur intermédiaire (Pz) correspond essentiellement à la puissance qui est nécessaire pour le maintien d'une température souhaitée (T1) de l'élément de chauffe (4).
  12. Dispositif (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que la valeur de guidage (F) est déduite d'une grandeur électrique d'un inducteur (10).
EP06754805A 2005-06-08 2006-04-24 Dispositif pour monter en température un élément chauffant Active EP1897414B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200501471A ES2289872B1 (es) 2005-06-08 2005-06-08 Dispositivo para calentamiento inductivo de un elemento calentador.
PCT/EP2006/061778 WO2006131419A1 (fr) 2005-06-08 2006-04-24 Dispositif pour monter en température un élément chauffant

Publications (2)

Publication Number Publication Date
EP1897414A1 EP1897414A1 (fr) 2008-03-12
EP1897414B1 true EP1897414B1 (fr) 2012-10-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06754805A Active EP1897414B1 (fr) 2005-06-08 2006-04-24 Dispositif pour monter en température un élément chauffant

Country Status (4)

Country Link
US (1) US20090294437A1 (fr)
EP (1) EP1897414B1 (fr)
ES (2) ES2289872B1 (fr)
WO (1) WO2006131419A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9006622B2 (en) 2010-11-30 2015-04-14 Bose Corporation Induction cooking
US8598497B2 (en) 2010-11-30 2013-12-03 Bose Corporation Cooking temperature and power control
KR20130073477A (ko) * 2011-12-23 2013-07-03 삼성전자주식회사 유도가열조리기 및 그 제어방법
US9470423B2 (en) 2013-12-02 2016-10-18 Bose Corporation Cooktop power control system

Family Cites Families (13)

* 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
JPH0744061B2 (ja) * 1986-02-19 1995-05-15 ソニー株式会社 電磁調理器
US5324906A (en) * 1991-12-21 1994-06-28 Goldstar Co., Ltd. Method for controlling a heating of high frequency cooker and apparatus thereof
DE4208252A1 (de) * 1992-03-14 1993-09-16 Ego Elektro Blanc & Fischer Induktive kochstellenbeheizung
JPH06124778A (ja) * 1992-10-14 1994-05-06 Matsushita Electric Ind Co Ltd 誘導加熱調理器
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
US7015438B2 (en) * 2002-01-25 2006-03-21 Matsushita Electric Industrial Co., Ltd. Induction heater
US6894255B2 (en) * 2002-03-22 2005-05-17 Matsushita Electric Industrial Co., Ltd. Induction heating apparatus
JP2004185829A (ja) * 2002-11-29 2004-07-02 Toshiba Corp 電磁調理器
ES2246640B1 (es) * 2003-05-15 2006-11-01 Bsh Electrodomesticos España, S.A. Regulacion de la temperatura para un elemento calentador de calentamiento inducido.
JP4617676B2 (ja) * 2004-01-27 2011-01-26 パナソニック株式会社 誘導加熱調理器
JP4892872B2 (ja) * 2005-05-27 2012-03-07 パナソニック株式会社 誘導加熱調理器
JP2008021452A (ja) * 2006-07-11 2008-01-31 Kobe Steel Ltd 誘導発熱体

Also Published As

Publication number Publication date
ES2393201T3 (es) 2012-12-19
ES2289872B1 (es) 2008-09-16
EP1897414A1 (fr) 2008-03-12
US20090294437A1 (en) 2009-12-03
WO2006131419A1 (fr) 2006-12-14
ES2289872A1 (es) 2008-02-01

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Inventor name: GARCIA JIMENEZ, JOSE RAMON

Inventor name: BURDIO PINILLA, JOSE MIGUEL

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