EP2112867B1 - Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs - Google Patents

Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs Download PDF

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Publication number
EP2112867B1
EP2112867B1 EP09075344.3A EP09075344A EP2112867B1 EP 2112867 B1 EP2112867 B1 EP 2112867B1 EP 09075344 A EP09075344 A EP 09075344A EP 2112867 B1 EP2112867 B1 EP 2112867B1
Authority
EP
European Patent Office
Prior art keywords
heating
container
inductors
inductor
hob
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
EP09075344.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2112867A2 (fr
EP2112867A3 (fr
Inventor
Didier Gouardo
Cédric GOUMY
Alain Roux
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.)
Groupe Brandt SAS
Original Assignee
FagorBrandt SAS
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 FagorBrandt SAS filed Critical FagorBrandt SAS
Publication of EP2112867A2 publication Critical patent/EP2112867A2/fr
Publication of EP2112867A3 publication Critical patent/EP2112867A3/fr
Application granted granted Critical
Publication of EP2112867B1 publication Critical patent/EP2112867B1/fr
Anticipated expiration legal-status Critical
Not-in-force 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
    • 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 present invention relates to a method of heating a container placed on a hob.
  • It relates generally to the field of hobs in which a container can be placed and heated at any location on the hob.
  • a detection loop of a cooking vessel makes it possible to detect the inductors covered by this receptacle. This information can be transmitted to a computer connected to a control box programming the amount of heat to be supplied to each of the inductors.
  • the present invention aims to optimize the detection of a container disposed on a hob without a predetermined location of the cooking chamber.
  • the present invention aims, in a first aspect, a method of heating a container placed on a hob comprising heating means respectively associated with inductors forming means for detecting the presence of a container, the heating means associated with these inductors being distributed in a two-dimensional grid in the hob.
  • This container addition step makes it possible to implement the research step only when placing a new container on the cooking surface, thus avoiding the continuous operation of inductors forming detection means.
  • the declaration step is implemented by action on a dedicated key of a control keyboard.
  • the declaration of adding a container is implemented after placing the container on the hob.
  • the declaration of adding a container is implemented before placing the container on the hob.
  • the heating means are inductors forming means for detecting the presence of a container.
  • the present invention relates to a hob comprising heating means respectively associated with inductors forming means for detecting the presence of a container, the heating means associated with the inductors being distributed along a two-dimensional grid in the cooking plan.
  • This hob includes means adapted to implement the heating method described above.
  • This hob has similar features and advantages to those described above in connection with the method of heating a container.
  • this hob comprises heating means 11 distributed in a two-dimensional grid in the hob of the hob 10.
  • This hob thus has a large cooking zone, up to the size of the hob, for heating one or more containers without precise location.
  • inductors forming detection means It is known to use for this purpose inductors forming detection means. For example, the measurement of the effective current passing through each inductor will be dependent on the surface of this inductor covered by a container.
  • an induction hob is considered, in which the heating means consist of inductors distributed in the hob.
  • These inductors 11 thus constitute both the heating means and the means for detecting the presence of a container.
  • the present invention could also be implemented for other types of heating means, and for example for radiant elements also arranged in a two-dimensional grid in the hob, each radiant hearth being associated with an inductor forming detection means.
  • the cooking zone disposed under the cooking surface consists of several small coils or elementary inductors arranged so as to cover the entire surface of the hob.
  • This cooking zone thus consists of a matrix of small inductors.
  • these inductors are circular in shape and are arranged in staggered rows in the hob.
  • the hob thus formed can be of any shape, and, for example, square, as in the example shown in FIG. figure 1 .
  • the size of the elementary inductors 11 is small enough that any container size covers at least one elementary inductor.
  • each elementary inductor may be equal to 70 or 80 mm.
  • the inductors In order to constitute a matrix of inductors that are close to one another and can operate individually, the inductors must be powered independently.
  • the maximum power supplied by each inductor is of the order of 700 Watts. It is thus possible to obtain a total power of approximately 2800 Watts for a medium-sized container covering four inductors 11.
  • each inductor 11 The power supply and the control of each inductor 11 are illustrated in FIG. figure 2 .
  • each elementary inductor 11 is powered by a dedicated power inverter electronic circuit 12.
  • each elementary cell constituted by an inductor 11 and a power inverter 12 is tuned to a fixed frequency equal, for example, to 25 kHz.
  • One or more control processors 13 manages all the cells and controls the operation of the various inductors when they are covered by a container.
  • the synchronization of the oscillation frequencies between the different inverters 12 is ensured on the one hand by a single clock circuit 14, distributed on each processor 13 and, on the other hand, by a synchronous start of the power inverters 12.
  • control processors 13 The operation of the control processors 13 is controlled by a master processor 15.
  • the power variation is provided by pulse width modulation (PWM or PWM) of the oscillation signal at the fixed working frequency.
  • PWM pulse width modulation
  • the control system can thus manage one or more containers placed on the hob and apply different powers depending on the desired power demanded by the user for each container.
  • the hob 10 comprises a control and display keyboard 16.
  • the prior declaration E10 addition step of a container on the hob avoids the cooktop to remain permanently with an activated container detection function, which could generate disturbances.
  • a search step E20 of a new heating zone Zi is then implemented.
  • this new zone Zi is canceled after a certain period of time equal for example to 1 minute.
  • a simple method of finding a heating zone would be to test all the inductors 11 at the same time.
  • this technique has many disadvantages such as the risk of generating a very large noise in the container, the appearance of a large and destructive current peak, particularly if the container is not adapted, and for example if the container is aluminum.
  • the power consumed could be significant when the container is large and may exceed the maximum power allowed for the table.
  • the search method comprises first of all an initialization step E21 of a new zone Zi, consisting of initializing a memory space adapted to temporarily store the inductors constituting this heating zone Zi.
  • a first inductor is considered, chosen according to a predetermined travel order of the inductors.
  • a test step E23 makes it possible to determine whether this inductor is free or not.
  • This test step E23 makes it possible to determine whether the inductor does not already belong to another heating zone formed in the hob, so that this inductor would already be used to heat another container.
  • this inductor is checked in a test step E24 if this inductor is the last inductor of the hob.
  • a test step E26 makes it possible to determine whether there is a load above this inductor, that is to say if a container covers at least partially this inductor.
  • the effective current passing through this inductor is measured. This value will be dependent on the surface of the inductor covered by the container.
  • steps E24 and following are repeated for a next inductor of the hob.
  • an addition step E27 is implemented in order to add the inductor detected at the heating zone Zi.
  • a storage step E28 is also implemented for each inductor added to the heating zone Zi, in order to memorize the recovery rate TREC of the added inductor.
  • the presence of a container facing the inductor is detected when the recovery rate of this inductor is greater than a predetermined threshold value.
  • This predetermined threshold value may be equal, for example, to 40%.
  • This detection threshold makes it possible to avoid feeding inductors slightly covered by a receptacle.
  • the recovery rate can be determined from the measurement of the mean and peak currents of the inductor. These measures are described in particular in the document FR 2 783 370 .
  • a test step E29 makes it possible to check whether the heating zone Z1 thus constituted is empty.
  • This new heating zone Zi is materialized by the display in a display step E30 of the presence and position of the container Ri on the display panel 16 of the hob.
  • the method of finding a container as described above with reference to the figure 4 is relatively long, especially when the number of free inductors is important. This is the case when placing a first container on the hob.
  • this search method comprises first an initialization step E31 of a new zone Zi. Then, in a step E32, a first inductor is considered.
  • a test step E33 makes it possible to check whether this inductor is free, that is to say if it does not already belong to another listed heating zone.
  • this inductor is checked in a test step E34 if it is the last inductor. If so, the new heating zone is canceled. Otherwise, we consider in a step E35 the next inductor.
  • the inductor When at the end of the test step E33, the inductor is free, it is verified in a test step E36 if there is a load opposite this inductor, that is to say, it detects the presence of a container placed above this inductor in the hob.
  • An E40 test step then makes it possible to check whether this list is empty. If not, consider the next adjacent inductor in a step E41.
  • An update step E42 of the list makes it possible to remove this inductor from the list of free inductors adjacent to the zone.
  • test step E43 similar to the test step E36, it is checked whether or not there is a load opposite this inductor.
  • the inductor is not arranged under a container, or in other words if its recovery rate by a container is less than 40% for example, it is reiterated. set of steps E40 and following on the list of free inductors adjacent to the heating zone to be constituted.
  • this creation is visualized by the display in a step E30 of the presence and the position of the container Ri.
  • This input step E30 is implemented by the user who can select on the keyboard a desired power level, for example between 1 and 15, corresponding to a power scale of between 100 and 2800 Watts.
  • the power delivered by each inductor depends on the recovery rate of the inductor.
  • a first inductor Ij of the heating zone Zi is then considered.
  • This recovery rate is typically between 40 and 100%.
  • a read step E63 provides access to the value of the recovery rate Ij associated with the inductor Ij as stored during the detection of the container and the constitution of the heating zone Zi.
  • a computation step proper E64 then makes it possible to determine the unit power Pj associated with this inductor Ij.
  • this unit power Pj delivered by the inductor Ij is a function of the overall nominal power Pi and the recovery rates of each inductor of this heating zone Zi.
  • the power distribution on each inductor can be performed according to different laws depending on the desired effect.
  • edges of the containers are very energy dissipators.
  • This power distribution formula advantageously heats the edges of the container. It is particularly favorable when the container is centered on one of the inductors so that a ring of inductors disposed under the edge of the container all have an identical partial recovery rate.
  • the control and control system of the different inductors must also be adapted to follow the movement of a container on the plane of baking so as to activate and deactivate the inductors respectively covered or uncovered after moving the container.
  • a detection step E70 of the movement of the container is implemented.
  • This detection of the movement of the container is carried out automatically by the control system.
  • the detection of the movement of a container has the effect, in the management system of the hob, to cause a new search step E80 of a heating zone Z'i moved.
  • This search step 80 is detailed at figure 8 and is substantially identical to the search step E20 as described above, with reference to the figure 5 .
  • This research step comprises first a test step E81 adapted to verify whether the initial heating zone Zi is empty.
  • this initial heating zone Zi is not completely empty, that is to say when the container has only been moved in a restricted manner on the cooking surface, so that it still covers some inductors of this initial heating zone Zi, a determination step E82 from the list of free inductors adjacent to the heating zone Zi is implemented.
  • This determination step is identical to the determination step E39 described above with reference to the figure 5 .
  • the new displaced zone Z'i is then considered with the modified recovery rates of each inductor to recalculate the power delivered by each of the inductors of this displaced zone Z'i.
  • a step E84 is adapted to consider an adjacent inductor of this list.
  • An update step E85 makes it possible to delete this adjacent inductor from the list constituted in step E82.
  • control system verifies the presence or absence of a load opposite this inductor.
  • This step of detecting the presence of a container is identical to the test step E36 described above with reference to the figure 5 .
  • steps E83 and following are repeated for a next adjacent inductor as long as the list of adjacent free inductors is not empty.
  • a storage step E88 makes it possible to store the recovery rate TREC of the added inductor.
  • a new determination step E82 of the list of free inductors adjacent to the heating zone thus modified is then implemented, and the steps E83 and following are repeated.
  • the detection of the displaced heating zone Z'i is implemented by same way as if it were a new heating zone, as illustrated in figure 5 .
  • steps E92 to E97 are respectively identical to the steps E32 to E37 described above with reference to FIG. figure 5 and do not need to be redescribed here.
  • a displaced heating zone Z'i is thus determined at the end of this search step E80.
  • the determination of a displaced heating zone Z'i is concretized by the display during a display step E100 of a new position of the container Ri on the display means 16 of the hob 10.
  • This reference power Pi is carried out during a calculation step E110 of the power delivered by each inductor of the displaced heating zone Z'i.
  • This calculation step E110 of the power is implemented in the same way as for an initial heating zone Zi, from the global reference power Pi and the recovery ratio associated with each inductor of this heating zone displaced Z i.
  • the induction cooktop described above, and the associated heating methods, provide a great flexibility of use for the user.
  • the containers are circular, any type of container shape, square or oval, and of various sizes could be used.
  • a container of size substantially equal to the size of the hob could be used, the maximum power allowed for the hob then being distributed over all the inductors arranged in the matrix hob.
  • control system is adapted to detect the presence of these containers and to recalculate a displaced heating zone as described in FIG. figure 8 , since there has been no declaration step E10 of the addition of a new container by the user.
  • the heating method could also be implemented from heating means consisting of radiant elements, provided that induction detection means are associated with each heating means.
  • induction detection means are associated with each heating means.
  • the use of a container in a ferromagnetic material is then necessary to allow induction detection of such a container.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Electric Stoves And Ranges (AREA)
  • General Induction Heating (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Cookers (AREA)
EP09075344.3A 2003-11-27 2004-11-12 Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs Not-in-force EP2112867B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0313925A FR2863039B1 (fr) 2003-11-27 2003-11-27 Procede de chauffage d'un recipient pose sur une table de cuisson a moyens de chauffage associe a des inducteurs
EP04805445A EP1688018B1 (fr) 2003-11-27 2004-11-12 Procede de chauffage d un recipient pose sur une table de cuisson a moyens de chauffage associes a des inducteurs

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP04805445A Division EP1688018B1 (fr) 2003-11-27 2004-11-12 Procede de chauffage d un recipient pose sur une table de cuisson a moyens de chauffage associes a des inducteurs
EP04805445.6 Division 2004-11-12

Publications (3)

Publication Number Publication Date
EP2112867A2 EP2112867A2 (fr) 2009-10-28
EP2112867A3 EP2112867A3 (fr) 2013-12-18
EP2112867B1 true EP2112867B1 (fr) 2015-01-14

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ID=34566183

Family Applications (5)

Application Number Title Priority Date Filing Date
EP09075344.3A Not-in-force EP2112867B1 (fr) 2003-11-27 2004-11-12 Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs
EP09075343.5A Not-in-force EP2112866B1 (fr) 2003-11-27 2004-11-12 Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs
EP04805445A Not-in-force EP1688018B1 (fr) 2003-11-27 2004-11-12 Procede de chauffage d un recipient pose sur une table de cuisson a moyens de chauffage associes a des inducteurs
EP09075341.9A Not-in-force EP2112865B1 (fr) 2003-11-27 2004-11-12 Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs
EP09075340.1A Withdrawn EP2112864A3 (fr) 2003-11-27 2004-11-12 Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs

Family Applications After (4)

Application Number Title Priority Date Filing Date
EP09075343.5A Not-in-force EP2112866B1 (fr) 2003-11-27 2004-11-12 Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs
EP04805445A Not-in-force EP1688018B1 (fr) 2003-11-27 2004-11-12 Procede de chauffage d un recipient pose sur une table de cuisson a moyens de chauffage associes a des inducteurs
EP09075341.9A Not-in-force EP2112865B1 (fr) 2003-11-27 2004-11-12 Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs
EP09075340.1A Withdrawn EP2112864A3 (fr) 2003-11-27 2004-11-12 Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs

Country Status (8)

Country Link
US (2) US7759616B2 (es)
EP (5) EP2112867B1 (es)
AT (1) ATE440478T1 (es)
DE (1) DE602004022701D1 (es)
ES (4) ES2331887T3 (es)
FR (1) FR2863039B1 (es)
PL (1) PL1688018T3 (es)
WO (1) WO2005064992A1 (es)

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EP2112866A2 (fr) 2009-10-28
FR2863039B1 (fr) 2006-02-17
FR2863039A1 (fr) 2005-06-03
EP2112867A2 (fr) 2009-10-28
EP2112864A2 (fr) 2009-10-28
EP2112865B1 (fr) 2015-02-18
EP2112865A3 (fr) 2013-12-18
DE602004022701D1 (de) 2009-10-01
EP2112866A3 (fr) 2013-12-18
EP2112867A3 (fr) 2013-12-18
EP2112866B1 (fr) 2015-01-14
ES2331887T3 (es) 2010-01-19
EP2112864A3 (fr) 2014-09-24
EP1688018A1 (fr) 2006-08-09
ES2538183T3 (es) 2015-06-17
EP1688018B1 (fr) 2009-08-19
EP2112865A2 (fr) 2009-10-28
ATE440478T1 (de) 2009-09-15
WO2005064992A1 (fr) 2005-07-14
US20100243642A1 (en) 2010-09-30
ES2538156T3 (es) 2015-06-17
US7759616B2 (en) 2010-07-20
ES2538181T3 (es) 2015-06-17
PL1688018T3 (pl) 2010-01-29
US20070164017A1 (en) 2007-07-19
US8742299B2 (en) 2014-06-03

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