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EP2236004B1 - Plaque de cuisson à induction munie d'une pluralité d'éléments chauffants à induction - Google Patents

Plaque de cuisson à induction munie d'une pluralité d'éléments chauffants à induction Download PDF

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Publication number
EP2236004B1
EP2236004B1 EP09701875.8A EP09701875A EP2236004B1 EP 2236004 B1 EP2236004 B1 EP 2236004B1 EP 09701875 A EP09701875 A EP 09701875A EP 2236004 B1 EP2236004 B1 EP 2236004B1
Authority
EP
European Patent Office
Prior art keywords
induction
heating elements
induction heating
heating
designed
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.)
Revoked
Application number
EP09701875.8A
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German (de)
English (en)
Other versions
EP2236004A1 (fr
Inventor
Jose Ignacio Artigas Maestre
Luis Angel Barragan Perez
Ignacio Garde Aranda
Pablo Jesus Hernandez Blasco
Daniel Palacios Tomas
Ramon Peinado Adiego
Denis Navarro Tabernero
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 Hausgeraete GmbH
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Publication date
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Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Priority to EP11164169.2A priority Critical patent/EP2352359B1/fr
Publication of EP2236004A1 publication Critical patent/EP2236004A1/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
    • 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 invention relates to an induction hob with a plurality of induction heaters according to the preamble of claim 1 and a method for operating an induction hob according to the preamble of claim 15.
  • So-called matrix induction hobs with a large number of induction heating elements, which are arranged in a grid or in a matrix, are known from the prior art.
  • the comparatively small induction heating elements can be flexibly combined to form essentially freely definable heating zones.
  • a control unit of the induction hob can detect cookware elements and combine those induction heating elements that are at least to some extent covered by a bottom of the detected cooking utensil element to a heating zone associated with the detected cookware element and operate synchronized.
  • Such induction hobs comprise a measuring arrangement with which the control unit can record characteristic values for a power of the individual induction heaters and use it to regulate the power to a desired value.
  • a characteristic may be, for example, a resistance, a current and / or an impedance of the induction heating element influenced by the cookware element in its electrical properties.
  • the induction heating elements are operated with high-frequency currents compared to the mains voltage, the measurement and evaluation of the signals of the measuring arrangement is complicated and the provision of the sensor system for each individual induction heating element is cost-intensive.
  • an induction cooker is known with two inverter circuits, which consist of a respective heating coil and a resonant capacitor and a switching element.
  • An input current detecting circuit of the induction cooker detects a value of an input current
  • a voltage detecting circuit of the induction cooker detects a voltage a power source.
  • the induction cooker further includes a microcomputer which controls the vibration of said inverter circuits and feeds the values detected by the input current detection circuit and the voltage detection circuit.
  • two oscillation circuits are controlled by the microcomputer so that they are alternately in operation.
  • the French publication FR 2 863 039 A discloses a method of heating a vessel mounted on a cooking plate having heating means.
  • the heating means are each associated with inductors which form means for detecting the presence of a vessel.
  • the heating means associated with the inductors are distributed in a two-dimensional grid on the cooking plate.
  • the method comprises the following two steps: search for a heating zone consisting of a group of heating means at least partially covered by the vessel and calculation of a power delivered by each heating means of the heating zone in dependence on a total setpoint power associated with the heating zone and of one degree the coverage of the vessel for each detection means associated with the heating means.
  • the invention is in particular the object of providing a generic induction hob, which is controllable with a less complex control algorithm. Furthermore, the invention has the object to reduce a required computing power of a control unit of such an induction hob and to simplify a measuring arrangement of such induction hob. Another task The invention is to simplify a method of operating such an induction hob.
  • the invention is based on an induction hob with a plurality of induction heaters, a control unit which is designed to operate synchronously a plurality of induction heaters a flexibly definable heating zone, and a measuring arrangement for measuring a heating power generated by the induction heaters.
  • the measuring arrangement is designed to measure a sum of heating powers of at least two induction heaters.
  • the control unit is also designed to use the sum of the heating powers for controlling the heating power.
  • the control unit and the measuring arrangement may be "designed" by suitable software, hardware, or a combination of these two factors to accomplish their tasks.
  • the invention is based in particular on the finding that in modern matrix induction hobs adjacent induction heaters are usually associated with the same heating zone. Detecting the individual heating power is unnecessary in this case and leads to an unnecessarily large complexity of the controller and to a less meaningful use of computing power. This is all the more true, the smaller the induction heaters are or the narrower the grid of the matrix induction hob is, since the proportion of those induction heaters, which are located at the edge of the heating zone, decreases with the grid. Further, by measuring the sums of the heating powers of groups of induction heaters, the number of necessary sensors can be reduced. For example, if a current is used as the parameter for the heating power, only one current sensor or ammeter must be used for each group of heating elements.
  • the measuring arrangement comprises a current sensor for measuring a sum of currents which flow through the at least two induction heaters.
  • the current sensor is for Measuring an input current of an inverter designed to feed the at least two induction heaters This can usually, if the at least two induction heaters are assigned to the same heating zone, a sufficiently accurate feedback size for performing a power control of the heating zone can be determined. A complexity of the control loop rhythm can be significantly reduced, and a number of required current sensors can be reduced.
  • the cooktop comprises a plurality of respective driver units associated with an induction heater, each having an inverter for generating a high frequency current for operating an induction body
  • a high frequency measurement can be avoided if the measurement arrangement is adapted to measure a sum of input powers of the driver units.
  • the input currents are typically currents with the grid frequency of, for example, 50 hertz of a household power grid and can therefore be measured with particularly simple and inexpensive standard sensor arrangements.
  • the measuring arrangement is designed to additionally measure the values of the currents flowing through the individual induction heaters.
  • These currents can be used as control variables, for example, in exceptional cases, in which the knowledge of the individual heating power of the induction heaters is required or can be used to limit the safety of the services of the induction heaters and / or the driver units.
  • the control unit can use the currents of the individual induction heaters to limit the inverter power.
  • control unit is designed to use the sum of the heating powers for controlling the heating power, if the at least two induction heaters are assigned to a common heating zone, and the values of the currents of the individual induction heaters for controlling the heating power to use this induction heater when the at least two induction heaters are assigned to different heating zones.
  • the inventive combination of two induction heaters with respect to the power measurement is particularly advantageously used, since the two combined induction heaters are adjacent induction heaters in a matrix of induction heaters.
  • the measuring arrangement and the data processing in the control unit can be further simplified if the measuring arrangement is designed to measure a sum of the heating powers of at least four adjacent induction heaters. Of course, six, eight or any other number of induction heaters can be grouped together.
  • control unit is designed to form a heating zone from a plurality of groups of induction heaters and to feed each of the groups from another inverter.
  • the control unit can then use the input currents of the inverters as a parameter for the sum of the heating powers of the induction heating elements fed by the relevant inverter, so that a power control without the measurement of the high-frequency heating currents can also be made possible in this case.
  • control unit If the control unit is designed to operate a plurality of groups of induction heaters with a single inverter in at least one operating state, the heating power of the individual groups can nevertheless be determined. For this purpose, the control unit can determine the proportion which one of the groups contributes to a total heat output in a phase in which only the induction heaters of this group are active.
  • control unit is designed to operate a plurality of groups of induction heaters simultaneously with an inverter in at least one operating state.
  • control unit is designed to operate a plurality of groups of induction heaters with a single inverter and to produce the different heating powers by a short-term, periodic deactivation of at least one induction heater.
  • Another aspect of the invention relates to a method of operating an induction hob with a plurality of induction heaters that are flexibly grouped into a heating zone.
  • a heating power generated by the induction heaters is measured and used to control the operation of the induction heaters.
  • FIG. 1 shows an induction hob with a plurality of induction heating elements 10, which can be combined by a control unit 12 in groups of flexibly definable heating zones 14 and operated synchronized.
  • the control unit 12 communicates with a measuring arrangement 16 of the induction cooktop, by means of which the control unit 12 can detect parameters for a heating power P, Pi generated by the induction heaters 10a, 10b. These parameters include currents, voltages and / or the electrical loss angles or impedances which can be tapped as measured values from the measuring arrangement 16 at different points of the induction hob.
  • the measuring arrangement 16 is designed for measuring a sum of heating powers P of at least two group-assembled induction heaters 10a, 10b. While in concrete embodiments of the invention, the group of induction heaters whose heat output is measured in total, four or more induction heaters may include, in the schematic representation in FIG. 2 for reasons of clarity, only two induction heaters 10a, 10b shown.
  • Each of the induction heaters 10a, 10b has an associated drive unit 20a, 20b, each comprising an inverter 22a, 22b.
  • the inverter 22a, 22b generates from a direct current generated by a rectifier 24 with a in a diagram 26 in FIG. 2 shown voltage waveform in comparison to a mains frequency of a household power network 28 high-frequency heating current 11, 12 for operating the induction heater 10a, 10b.
  • a filter 30 is arranged, which prevents damage to the induction hob by power surges from the household electricity network 28.
  • a diagram 32 shows a voltage curve of the heating current 11, 12 which, depending on a desired heating power of the heating zone 14, has a frequency of 20 to 50 kHz and an envelope oscillating at the mains frequency.
  • the current sensor 18 may be disposed between the filter 30 and the rectifier 24 so as to substantially measure the low frequency alternating current from the home electric grid 28 at a grid frequency of 50 Hertz.
  • the measuring arrangement 16 with the current sensor 18 therefore measures a sum P of input powers of the driver units 20a, 20b.
  • the input current I of the rectifier 24 is used as a parameter for the input powers.
  • Further current sensors 34a, 34b of the measuring arrangement 16 serve to measure the currents 11, 12 which flow through the individual induction heaters 10a, 10b.
  • the currents 11, 12 are therefore the actual heating currents of the induction heaters 10a, 10b.
  • both induction heaters 10a, 10b are associated with the same heating zone 14 and are completely covered by a pan bottom of a cookware element disposed on the heating zone 14, the flows 11, 12 are at least substantially equal and can to a very good approximation be a given fraction of the input flow I of the rectifier 24 are calculated.
  • the control unit 12 uses the currents 11, 12 of the individual induction heaters 10a, 10b measured by the current sensors 34a, 34b, as a rule, only for protecting the inverters 22a, 22b and for detecting the cookware elements on the induction hob.
  • the signals obtained from the current sensors 34a, 34b do not have to be subjected to complex signal processing, so that a complexity of the tasks of the control unit 12 can be greatly reduced in comparison with conventional induction hobs.
  • the amplitudes of the currents 11, 12 need only be compared to a threshold value.
  • the control unit 12 comprises a freely programmable processor and an operating program, which first performs a cookware detection method periodically or after a start signal of the user.
  • the control unit 12 thereby detects a size and position of cooking utensils placed on the induction hob or on a cover plate of the induction high field and combines induction heating elements 10, which are at least to some extent covered by the cookware element, to form a heating zone 14.
  • control unit 12 regulates a heating power of the heating zone 14 to a setpoint dependent on the heating stage. For this purpose, it forms a sum of the heating powers of the individual induction heating elements 10 and compares this sum with the setpoint value.
  • control unit 12 uses the sum signal of the current sensor 18 when all induction heaters 10 whose heating power is measured together by the current sensor 18, the heating zone 14 belong. Otherwise, the control unit 12 uses the current sensors 34a, 34b to determine the individual heating powers Pi.
  • control unit 12 uses the signal of the current sensor 18 to determine the heating power. In comparison to groups of induction heating elements which belong completely to the heating zone 14, the setpoint heating power of this group flowing into the control is reduced by a factor corresponding to the proportion of the active induction heating elements.
  • the above-described induction hob or control unit 12 implements a method for operating an induction hob with a plurality of induction heaters 10 a, 10 b, which can be flexibly grouped and combined to form a heating zone 14.
  • a heating power generated by the induction heaters 10a, 10b is measured and used to control the operation of the induction heaters 10a, 10b.
  • control unit 12 detects a sum of heating powers of a group of induction heaters 10a, 10b and uses this sum in a normal case as a controlled variable for operating the group of induction heaters 10a, 10b.
  • the heating currents of the individual induction heaters 10a, 10b also flow into the control method as control parameters.
  • FIG. 3 shows a schematic representation of a matrix cooktop with two inverters 22a, 22b, which can be connected via a switching arrangement 36 with induction heaters 10a - 10e.
  • the hob comprises a matrix of induction heaters 10a - 10e, of which in FIG. 3 only five pieces are shown as examples.
  • a satisfactory spatial resolution in the definition of the heating zones 14 can be realized at a reasonable cost and an acceptable control effort, if the actual number of induction heaters 10a - 10e is between 40 and 64.
  • the switching arrangement 36 can connect at least one of the induction heaters 10a-10e optionally to one of the two inverters 22a, 22b, or each of the inverters 22a, 22b to selectable groups of induction heaters 10a-10e.
  • each of the inverters 22a, 22b is equipped with a current sensor 18a, 18b, which is arranged between a rectifier 24 and the respective inverter 22a, 22b.
  • the current sensors 18a, 18b measure the rectified current from the household power grid 28, the relevant frequency components amount to a maximum of about 100 Hz. Because of the low frequencies, current measurements of the input current of the inverters 22a, 22b are simpler than current measurements of the output currents of the inverters 22a, 22b, whose frequency is on the order of 75 kHz.
  • FIG. 4 schematically shows a heating zone 14, which is formed by nine induction heating 10a - 10i.
  • a first group of induction heaters 10a-10c is powered by a first inverter 22a and a second group of induction heaters 10d-10i is powered by a second inverter 22b.
  • the control unit 12 calculates a target total heating power for the heating zone 14, depending on the set power level and the size of the heating zone 14.
  • the control unit 12 controls the heating power of the heating zone 14 on the sun specific setpoint.
  • the control unit calculates from the input currents 11, 12 of the inverters 22a, 22b, which are measured via the current sensors 18a, 18b, a total heating power of the two groups of induction heating elements 10a-10i and calculates the total heating power of the heating zone 14 by isolating the heating powers of the groups ,
  • the heating power can be controlled to the target value by varying the heating frequency generated by the inverters 22a, 22b in a closed loop.
  • the heating elements 10a-10j of the two groups are each operated with heating currents at the same frequency.
  • the group heating powers of the two groups then automatically adjust to a value which is determined by the coupling strength of the different induction heating elements 10a-10j to the bottom of the cooking pot.
  • the control unit 12 can control the heating power of the individual induction heating elements 10a-10j by means of limiting current sensors of the type shown in FIG FIG. 2 Monitor the type shown. If there is an imbalance between the group heating powers of the two groups, the control unit can assign one of the induction heaters 10a-10j to the other group by switching the switching arrangement 36.
  • control unit 12 can operate the induction heating elements 10a-10i of one of the groups in a clocked manner by actuation of the switching arrangement 36, or the inverters 22a, 22b can generate heating currents with different heating frequencies.
  • FIG. 5 shows a flowchart of a method for distributing a total heat output to the inverters in the in FIG. 4 illustrated situation.
  • a ratio of the group heating powers is calculated by different groups of heating elements, which together form a heating zone 14. For example, it may be determined that a first group of induction heating elements 10a-10i should produce 70% of the total heating power and that a second group of induction heating elements 10a-10i should generate 30% of the total heating power.
  • This distribution can be, for example be chosen so that the bottom of the cookware heats up as homogeneously as possible.
  • the surface portions of the cookware base assigned to the different groups of induction heating elements 10a-10i are determined or estimated by the control unit 12 and the distribution of the total heating power takes place in the ratio of the surface portions.
  • the control unit 12 can at any moment determine the group heating power of the two groups and regulate it to the desired value, which corresponds to the predetermined proportion of the total heating power.
  • the group heating powers may be accomplished by varying the frequency of the heating currents, by changing the amplitude of the heating currents, or by suitably adjusting lengths of operating phases of the various groups of heating elements in a timed operation.
  • the amplitude change can be achieved by a change in the pulse phase of control signals, which are transmitted from the control unit 12 to the inverters 22a, 22b.
  • the control unit 12 decides which of the above-mentioned methods is used. Preference is always given to the simultaneous change in the frequency of the heating currents of both groups, as this interference hum can be avoided.
  • step S3 the operating parameters are changed so that the group heating power changes in the direction of its setpoint. Subsequently, the process returns to step S1 to close the control loop.
  • FIG. 6 shows a schematic representation of two heating zones 14a, 14b, the induction heating elements 10a - 10d and 10e - 10g from a single inverter 22 (not shown) are operated.
  • the control unit 12 can determine via a current sensor 18 only the input current of the inverter and thus the total heating power of both heating zones 14a, 14b, if both heating zones 14a, 14b are operated simultaneously.
  • the control unit 12 uses an in FIG. 7 schematically illustrated method.
  • the control unit disconnects by operating the switching arrangement 36, the inductors 10a-10d of the first heating zone 14a from the inverter and measured via the inverter associated with the current sensor 18, the now consumed only by the second heating zone 14b heating power.
  • the control unit 12 closes the connection between the induction heating elements 10a-10d of the heating zones 14a with the inverter 22 by actuating the switching arrangement 36. Subsequently, the control unit 12 again measures the total heat output now consumed by the two heating zones 14a, 14b with the aid of the current sensor 18.
  • the heating power of the second heating zones 14b is calculated in a step S73 by forming the difference between the total heating power determined in step S72 and the heating power determined in step S71.
  • the control unit forms the ratio of the heating powers of the individual heating zones 14a, 14b and compares it with a desired value. In the case of a clocked operation of the induction heating elements 10a-10i, the control unit takes into account that the heating elements of the heating zones 14a, 14b are switched off in phases and calculates an average heating power. If deviations from the target value occur, the control unit 12 changes in a step S75 the duration of the heating phases of the heating zones 14a, 14b so that the ratio changes in the direction of the target value.
  • FIG. 8 shows a schematic representation of two heating zones 14a, 14b, the induction heating elements 10a - 10g are each fed by a plurality of inverters. Each of an inverter associated induction heating are in FIG. 8 represented with the same hatching.
  • the distribution of the total heating power to the various heating zones 14a, 14b and to the various heating elements 10a-10g is effected by a combination of the in Figures 5 and 7 illustrated method.
  • the second heating zone 14b is switched off for a short time.
  • the input currents of each inverter are measured so that the distribution of the total heating power of both heating zones 14a, 14b to the various inverters is immediately known.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • General Induction Heating (AREA)

Claims (12)

  1. Plaque de cuisson à induction dotée d'une pluralité d'éléments chauffants à induction (10), d'une unité de commande (12) qui est conçue pour faire fonctionner de manière synchronisée plusieurs éléments chauffants à induction (10) pour chauffer au moins une zone chauffante (14) pouvant être définie de façon flexible, et d'un dispositif de mesure (16) pour mesurer une puissance de chauffe (P, Pi) générée par les éléments chauffants à induction (10), le dispositif de mesure (16) étant conçu pour mesurer une somme des puissances de chauffe (P) d'au moins deux éléments chauffants à induction (10a, 10b), l'unité de commande (12) étant conçue pour utiliser la somme des puissances de chauffe (P) pour régler la puissance de chauffe (P, Pi), les au moins deux éléments chauffants à induction (10a, 10b) étant des éléments chauffants à inductions (10a, 10b) adjacents dans une matrice d'éléments chauffants à induction (10a, 10b), et le dispositif de mesure (16) comprenant au moins un capteur de courant (18) pour mesurer une somme de courants parcourant les au moins deux éléments chauffants à induction (10a, 10b), caractérisée en ce que le capteur de courant (18) est conçu pour mesurer un courant d'entrée d'un onduleur, qui alimente les au moins deux éléments chauffants à induction (10a, 10b).
  2. Plaque de cuisson à induction selon la revendication 1, caractérisée par plusieurs onduleurs (22a, 22b) servant à générer une tension alternative pour alimenter les éléments chauffants à induction (10), le dispositif de mesure (16) comprenant plusieurs capteurs de courant (18) pour mesurer un courant d'entrée de chacun des onduleurs (22a, 22b).
  3. Plaque de cuisson à induction selon l'une des revendications précédentes, caractérisée par une pluralité d'unités pilotes (20a, 20b) respectivement affectées à un élément chauffant à induction (10a, 10b), qui comprennent chacune un onduleur (22a, 22b) servant à générer un courant de haute fréquence pour faire fonctionner les éléments chauffants à induction (10a, 10b), le dispositif de mesure (16) étant conçu pour mesurer une somme de puissances d'entrée des unités pilotes (20a, 20b).
  4. Plaque de cuisson à induction selon l'une des revendications précédentes, caractérisée en ce que le dispositif de mesure (16) est conçu pour mesurer en plus des valeurs des courants (I1, I2) qui parcourent les différents éléments chauffants à induction (10a, 10b).
  5. Plaque de cuisson à induction selon la revendication 4, caractérisée en ce que l'unité de commande (12) est conçue pour utiliser des valeurs des courants (I1, I2) des différents éléments chauffants à induction (10a, 10b) pour limiter une puissance d'onduleur.
  6. Plaque de cuisson à induction selon l'une des revendications précédentes, caractérisée en ce que l'unité de commande (12) est conçue pour utiliser la somme des puissances de chauffe (P) pour régler la puissance de chauffe (P, Pi) lorsque les au moins deux éléments chauffants à induction (10a, 10b) sont affectés à une zone de chauffe (14) commune, et pour utiliser les valeurs des courants (I1, I2) des différents éléments chauffants à induction (10a, 10b) pour régler les puissances de chauffe (P, Pi) de ces éléments chauffants à induction (10a, 10b) lorsque les au moins deux éléments chauffants à induction (10a, 10b) sont affectés à des zones de chauffe (14) différentes.
  7. Plaque de cuisson à induction selon l'une des revendications précédentes, caractérisée en ce que le dispositif de mesure (16) est conçu pour mesurer une somme des puissances de chauffe (P) d'au moins quatre éléments chauffants à induction (10a, 10b) adjacents.
  8. Plaque de cuisson à induction selon l'une des revendications précédentes, caractérisée en ce que l'unité de commande (12) est conçue pour former une zone de chauffe (14) composée de plusieurs groupes d'éléments chauffants à induction (10a, 10b) et pour alimenter chacun des groupes par un autre onduleur (22a, 22b), l'unité de commande (12) utilisant les courants d'entrée des onduleurs (22a, 22b) comme caractéristique pour la somme des puissances de chauffe des éléments chauffants à induction (10a, 10b) alimentés par l'onduleur (22a, 22b) correspondant.
  9. Plaque de cuisson à induction selon l'une des revendications précédentes, caractérisée en ce que l'unité de commande (12) est conçue pour faire fonctionner dans au moins un état de fonctionnement plusieurs groupes d'éléments chauffants à induction (10a, 10b) avec un seul onduleur (22a, 22b) et pour déterminer la part de contribution d'un des groupes à une puissance de chauffe totale dans une phase dans laquelle seuls les éléments chauffants à induction (10a, 10b) de ce groupe sont actifs.
  10. Plaque de cuisson à induction selon l'une des revendications précédentes, caractérisée en ce que l'unité de commande (12) est conçue pour faire fonctionner dans au moins un état de fonctionnement plusieurs groupes d'éléments chauffants à induction (10a, 10b) de manière simultanée.
  11. Plaque de cuisson à induction selon l'une des revendications précédentes, caractérisée en ce que l'unité de commande (12) est conçue pour faire fonctionner plusieurs groupes d'éléments chauffants à induction (10a, 10b) avec un seul onduleur (22a, 22b) et pour générer des puissances de chauffe différentes par une courte désactivation périodique d'au moins un élément chauffant à induction (10a, 10b).
  12. Procédé pour faire fonctionner une plaque de cuisson à induction dotée d'une pluralité d'éléments chauffants à induction (10a, 10b) qui sont regroupés de manière flexible en une zone de chauffe (14), une puissance de chauffe (P, Pi) générée par les éléments chauffants à induction (10a, 10b) étant mesurée et utilisée pour régler le fonctionnement des éléments chauffants à induction (10a, 10b), une somme de puissances de chauffe (P) d'au moins deux éléments chauffants à induction (10a, 10b) étant mesurée et utilisée comme grandeur réglée pour faire fonctionner les au moins deux éléments chauffants à induction (10a, 10b), les au moins deux éléments chauffants à induction (10a, 10b) étant des éléments chauffants à inductions (10a, 10b) adjacents dans une matrice d'éléments chauffants à induction (10a, 10b), le dispositif de mesure (16) comprenant au moins un capteur de courant (18) pour mesurer une somme de courants parcourant les au moins deux éléments chauffants à induction (10a, 10b), et le capteur de courant (18) étant conçu pour mesurer un courant d'entrée d'un onduleur, qui alimente les au moins deux éléments chauffants à induction (10a, 10b).
EP09701875.8A 2008-01-14 2009-01-12 Plaque de cuisson à induction munie d'une pluralité d'éléments chauffants à induction Revoked EP2236004B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11164169.2A EP2352359B1 (fr) 2008-01-14 2009-01-12 Champ de cuisson à induction doté d'une multitude de corps de chauffage à induction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200800175A ES2335256B1 (es) 2008-01-14 2008-01-14 Campo de cocion por induccion con una pluralidad de cuerpos de calentamiento por induccion.
PCT/EP2009/050274 WO2009090152A1 (fr) 2008-01-14 2009-01-12 Plaque de cuisson à induction munie d'une pluralité d'éléments chauffants à induction

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP11164169.2A Division EP2352359B1 (fr) 2008-01-14 2009-01-12 Champ de cuisson à induction doté d'une multitude de corps de chauffage à induction
EP11164169.2A Division-Into EP2352359B1 (fr) 2008-01-14 2009-01-12 Champ de cuisson à induction doté d'une multitude de corps de chauffage à induction

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EP2236004A1 EP2236004A1 (fr) 2010-10-06
EP2236004B1 true EP2236004B1 (fr) 2017-05-10

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EP11164169.2A Active EP2352359B1 (fr) 2008-01-14 2009-01-12 Champ de cuisson à induction doté d'une multitude de corps de chauffage à induction

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EP (2) EP2236004B1 (fr)
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Also Published As

Publication number Publication date
EP2352359B1 (fr) 2016-08-17
EP2352359A1 (fr) 2011-08-03
ES2335256B1 (es) 2011-01-17
EP2236004A1 (fr) 2010-10-06
WO2009090152A1 (fr) 2009-07-23
ES2335256A1 (es) 2010-03-23
US8558148B2 (en) 2013-10-15
US20100282740A1 (en) 2010-11-11
ES2588764T3 (es) 2016-11-04

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