EP3432683B1 - Appareil de cuisson à induction, procédé de fonctionnement et programme informatique - Google Patents

Appareil de cuisson à induction, procédé de fonctionnement et programme informatique Download PDF

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Publication number
EP3432683B1
EP3432683B1 EP17182438.6A EP17182438A EP3432683B1 EP 3432683 B1 EP3432683 B1 EP 3432683B1 EP 17182438 A EP17182438 A EP 17182438A EP 3432683 B1 EP3432683 B1 EP 3432683B1
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EP
European Patent Office
Prior art keywords
current
inductance
predetermined threshold
measured
induction
Prior art date
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EP17182438.6A
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German (de)
English (en)
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EP3432683A1 (fr
Inventor
Burak ÜNVER
Yusuf AK
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.)
Vestel Elektronik Sanayi ve Ticaret AS
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Vestel Elektronik Sanayi ve Ticaret AS
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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

Definitions

  • the present disclosure relates to an induction cooker, a method for operating an induction cooker and a computer program.
  • Induction cookers are known in which a varying electric current is passed through an induction coil, the coil therefore producing a corresponding varying electromagnetic field.
  • the varying electromagnetic field induces a varying eddy current in a ferromagnetic cooking vessel or the like when the cooking vessel is placed in close proximity to the induction coil, which in turn heats the cooking vessel and therefore the contents of the cooking vessel.
  • One or more transistors may be used to vary the frequency of supply of current to the induction coil and thereby control the power that is provided to the induction coil.
  • EP 2 437 573 A1 discloses an induction cooker and a method for operating an induction cooker wherein a decision to stop supplying current to the heating coil is based on calculated value of the inductance of the coil and the load resistance.
  • a current source switchable by one or more semiconductor switches to supply a varying current to an induction coil at a selected frequency comprising:
  • the method may comprise: (v) following a predetermined time period of operating the induction cooker, repeating steps (i) to (iv).
  • the monitoring process steps of the present invention may be operated in a cyclic manner with a predetermined delay between each operation of the method.
  • the method may comprise operating steps (i) to (iv) within a predetermined monitoring time period.
  • the predetermined time period may be for example 10ms.
  • an induction cooker comprising an induction coil within a resonant converter circuit; a switching arrangement comprising one or more semiconductor switches linked to a current source; and a switch controller arranged to control the switching arrangement to supply a varying electric current at a selected frequency to the induction coil, wherein the switch controller is arranged selectively to receive measurements of induction coil inductance, induction coil current and semiconductor conduction time from respective measurement means and to determine, by comparison of the measurements with respective predetermined threshold operating values, whether the induction coil has reached magnetic saturation and, if so, to terminate the supply of current to the induction coil.
  • the switch controller is arranged to determine that the induction coil has reached magnetic saturation if each of the inductance, current and conduction time measurements are found respectively to be lower than, greater than and lower than the predetermined threshold operating values of inductance, current and conduction time, within a predetermined time period.
  • the time period may be for example 10ms.
  • an induction cooker switch controller comprising a data processor programmed to implement a method as described above.
  • a known problem in the operation of an induction cooker 10 such as that shown in Figure 1 occurs when the induction coil 12 reaches magnetic saturation and all of the magnetic domains in the ferromagnetic cooking vessel 30 become aligned to the field. In such a situation, inductance of the induction coil 12 falls. Magnetic saturation may be reached at different stages with different types of cooking vessel 30, according to their respective ferromagnetic properties. As magnetic saturation approaches, the fall in induction coil inductance results in symptoms such as a rapid rise in the current levels flowing in the switching network. Various techniques are known by which to respond to the symptoms of magnetic saturation, including the use of current limiters.
  • measurement of inductance may be achieved by monitoring changes in voltage over predetermined time intervals across the induction coil 12 and across a resistor (not shown in Figure 1 ) connected in series with the induction coil 12.
  • Such voltage measurements across a resistor connected in series with the induction coil 12 may also be used to determine the instant current flowing through the induction coil 12 at predetermined time intervals and hence the rate of change of current.
  • Conduction times of the transistor switches may also be determined from changing current values measured over a switching cycle of the respective switch.
  • the threshold for the measured inductance value may be set at least 30% below the normal operating value of the inductance.
  • the threshold for the measured current value may be set at least 30% greater than maximum normal operating current value.
  • the threshold for the measured conduction time of the transistor switches may be set to be a value 20% greater than a known minimum operating conduction time.
  • Such values may be stored in data storage provided by a single data storage device or by plural devices. Suitable devices include for example a hard disk and non-volatile semiconductor memory.

Landscapes

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

Claims (11)

  1. Procédé de fonctionnement d'un appareil de cuisson à induction ayant une source de courant (16, 18, 20, 21) en mesure d'être commutée par un ou plusieurs commutateurs à semi-conducteur (22) à des fins d'alimentation d'un courant fluctuant à une bobine d'induction (12) à une fréquence sélectionnée, le procédé comportant les étapes consistant à :
    (i) mesurer l'inductance de la bobine d'induction et comparer l'inductance mesurée avec une valeur d'inductance de seuil prédéterminée ;
    (ii) si, au niveau de l'étape (i), l'inductance mesurée est inférieure à la valeur d'inductance de seuil prédéterminée, mesurer le courant électrique s'écoulant au travers de la bobine d'induction et comparer le courant mesuré avec une valeur de courant de seuil prédéterminée, sinon continuer le fonctionnement de l'appareil de cuisson à induction ;
    (iii) si, au niveau de l'étape (ii), le courant mesuré est supérieur à la valeur de courant de seuil prédéterminée, mesurer le temps de conduction desdits un ou plusieurs commutateurs à semi-conducteur et comparer le temps de conduction mesuré avec une valeur de temps de conduction de seuil prédéterminée, sinon continuer le fonctionnement de l'appareil de cuisson à induction ; et
    (iv) si, au niveau de l'étape (iii), la valeur de temps de conduction mesurée est inférieure à la valeur de temps de conduction de seuil prédéterminée, terminer l'alimentation en courant à la bobine d'induction, sinon continuer le fonctionnement de l'appareil de cuisson à induction.
  2. Procédé selon la revendication 1, comportant :
    (v) suite à une période de temps prédéterminée de fonctionnement de l'appareil de cuisson à induction, l'étape consistant à répéter les étapes (i) à (iv).
  3. Procédé selon la revendication 1 ou la revendication 2, comportant l'étape consistant à effectuer les étapes (i) à (iv) dans les limites d'une période de temps de surveillance prédéterminée.
  4. Appareil de cuisson à induction, comportant
    une bobine d'induction (12) dans un circuit de convertisseur auto-oscillant ;
    un agencement de commutation comportant un ou plusieurs commutateurs à semi-conducteur (22) reliés à une source de courant (16, 18, 20, 21) ; et
    un dispositif de commande de commutateur (24) agencé pour commander l'agencement de commutation à des fins d'alimentation d'un courant électrique fluctuant à une fréquence sélectionnée à la bobine d'induction,
    dans lequel le dispositif de commande de commutateur est agencé de manière sélective pour recevoir des mesures se rapportant à l'inductance de la bobine d'induction, au courant de la bobine d'induction et au temps de conduction de semi-conducteur en provenance de moyens de mesure respectifs et pour déterminer, par la comparaison des mesures avec des valeurs de fonctionnement de seuil prédéterminées respectives, si la bobine d'induction a atteint la saturation magnétique et, si c'est le cas, pour mettre fin à l'alimentation de courant à la bobine d'induction.
  5. Appareil de cuisson à induction selon la revendication 4, dans lequel le dispositif de commande de commutateur est agencé pour déterminer que la bobine d'induction a atteint la saturation magnétique si chacune parmi les mesures se rapportant à l'inductance, au courant et au temps de conduction de semi-conducteur se révèle être respectivement inférieure aux, supérieure aux et inférieure aux valeurs de fonctionnement de seuil prédéterminées se rapportant à l'inductance, au courant et au temps de conduction dans les limites d'une période de temps.
  6. Dispositif de commande de commutateur d'appareil de cuisson à induction (24), comportant un processeur de données programmé pour mettre en œuvre un procédé de fonctionnement d'un appareil de cuisson à induction ayant une source de courant (16, 18, 20, 21) en mesure d'être commutée par un ou plusieurs commutateurs à semi-conducteur (22) à des fins d'alimentation d'un courant fluctuant à une bobine d'induction (12) à une fréquence sélectionnée, le procédé comportant les étapes consistant à :
    (i) mesurer l'inductance de la bobine d'induction et comparer l'inductance mesurée avec une valeur d'inductance de seuil prédéterminée ;
    (ii) si, au niveau de l'étape (i), l'inductance mesurée est inférieure à la valeur d'inductance de seuil prédéterminée, mesurer le courant électrique s'écoulant au travers de la bobine d'induction et comparer le courant mesuré avec une valeur de courant de seuil prédéterminée, sinon continuer le fonctionnement de l'appareil de cuisson à induction ;
    (iii) si, au niveau de l'étape (ii), le courant mesuré est supérieur à la valeur de courant de seuil prédéterminée, mesurer le temps de conduction desdits un ou plusieurs commutateurs à semi-conducteur et comparer le temps de conduction mesuré avec une valeur de temps de conduction de seuil prédéterminée, sinon continuer le fonctionnement de l'appareil de cuisson à induction ; et
    (iv) si, au niveau de l'étape (iii), la valeur de temps de conduction mesurée est inférieure à la valeur de temps de conduction de seuil prédéterminée, terminer l'alimentation en courant à la bobine d'induction, sinon continuer le fonctionnement de l'appareil de cuisson à induction.
  7. Dispositif de commande de commutateur d'appareil de cuisson à induction selon la revendication 6, le procédé comportant :
    (v) suite à une période de temps prédéterminée de fonctionnement de l'appareil de cuisson à induction, l'étape consistant à répéter les étapes (i) à (iv).
  8. Dispositif de commande de commutateur d'appareil de cuisson à induction selon la revendication 6 ou la revendication 7, le procédé comportant l'étape consistant à effectuer les étapes (i) à (iv) dans les limites d'une période de temps de surveillance prédéterminée.
  9. Programme informatique comportant un code de programme informatique qui, quand il est installé dans et exécuté par un processeur informatique, amène le processeur informatique à mettre en œuvre un procédé de fonctionnement d'un appareil de cuisson à induction ayant une source de courant (16, 18, 20, 21) en mesure d'être commutée par un ou plusieurs commutateurs à semi-conducteur (22) à des fins d'alimentation d'un courant fluctuant à une bobine d'induction (12) à une fréquence sélectionnée, le procédé comportant les étapes consistant à :
    (i) mesurer l'inductance de la bobine d'induction et comparer l'inductance mesurée avec une valeur d'inductance de seuil prédéterminée ;
    (ii) si, au niveau de l'étape (i), l'inductance mesurée est inférieure à la valeur d'inductance de seuil prédéterminée, mesurer le courant électrique s'écoulant au travers de la bobine d'induction et comparer le courant mesuré avec une valeur de courant de seuil prédéterminée, sinon continuer le fonctionnement de l'appareil de cuisson à induction ;
    (iii) si, au niveau de l'étape (ii), le courant mesuré est supérieur à la valeur de courant de seuil prédéterminée, mesurer le temps de conduction desdits un ou plusieurs commutateurs à semi-conducteur et comparer le temps de conduction mesuré avec une valeur de temps de conduction de seuil prédéterminée, sinon continuer le fonctionnement de l'appareil de cuisson à induction ; et
    (iv) si, au niveau de l'étape (iii), la valeur de temps de conduction mesurée est inférieure à la valeur de temps de conduction de seuil prédéterminée, terminer l'alimentation en courant à la bobine d'induction, sinon continuer le fonctionnement de l'appareil de cuisson à induction.
  10. Programme informatique selon la revendication 9, le procédé comportant :
    (v) suite à une période de temps prédéterminée de fonctionnement de l'appareil de cuisson à induction, l'étape consistant à répéter les étapes (i) à (iv).
  11. Programme informatique selon la revendication 9 ou la revendication 10, le procédé comportant l'étape consistant à effectuer les étapes (i) à (iv) dans les limites d'une période de temps de surveillance prédéterminée.
EP17182438.6A 2017-07-20 2017-07-20 Appareil de cuisson à induction, procédé de fonctionnement et programme informatique Active EP3432683B1 (fr)

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EP17182438.6A EP3432683B1 (fr) 2017-07-20 2017-07-20 Appareil de cuisson à induction, procédé de fonctionnement et programme informatique

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EP3432683B1 true EP3432683B1 (fr) 2020-05-13

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155707B (en) * 1984-02-09 1988-06-02 Sanyo Electric Co Induction heating apparatus
FR2726961B1 (fr) * 1994-11-15 1996-12-06 Europ Equip Menager Foyer de cuisson a inducteur protege en temperature
ES2557329T3 (es) * 2009-05-26 2016-01-25 Mitsubishi Electric Corporation Método de calentamiento por inducción

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* Cited by examiner, † Cited by third party
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