EP4581902A1 - Appareil de cuisson - Google Patents

Appareil de cuisson

Info

Publication number
EP4581902A1
EP4581902A1 EP23745088.7A EP23745088A EP4581902A1 EP 4581902 A1 EP4581902 A1 EP 4581902A1 EP 23745088 A EP23745088 A EP 23745088A EP 4581902 A1 EP4581902 A1 EP 4581902A1
Authority
EP
European Patent Office
Prior art keywords
duty cycle
cooking appliance
interval
switch
control unit
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.)
Pending
Application number
EP23745088.7A
Other languages
German (de)
English (en)
Inventor
Eduardo Imaz Martinez
Manuel Fernandez Martinez
Cristina Blan Sanmartin
Victor Camañes Vera
Jose Manuel Palacios Gasos
Lucia Herrero Lorente
Diego Puyal Puente
Javier SERRANO TRULLEN
Rosario Romeo Velilla
Alberto Dominguez Vicente
Jorge VILLA LOPEZ
Jorge ESPAÑOL LEZA
Antonio Muñoz Fumanal
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
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 BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP4581902A1 publication Critical patent/EP4581902A1/fr
Pending legal-status Critical Current

Links

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 cooking appliance device according to the preamble of claim 1 and a method for operating a cooking appliance device according to the preamble of claim 12.
  • Cooking appliances in particular hobs, with cooking appliance devices are already known from the prior art, which have inductors which are operated to heat various cooking utensils, with complex control schemes for controlling inductors for heating cooking utensils being used to avoid intermodulation noises as a result of increased customer requirements For example, noise levels and cooking temperatures are taken into account, which makes it difficult to comply with flicker and EMC (electromagnetic compatibility) standards, which in turn increases the complexity of the control scheme.
  • EP 3001773 B1 discloses an induction hob device with two inverters, each of which operates an inductor, and with a control unit that operates two inverters together in a time window of a continuous operating state and divides the time window into two time intervals, the control unit achieving a total heating output the at least two inverters continuously change in a transition time interval of the two time intervals.
  • the object of the invention is, in particular, to provide a generic cooking appliance device with improved properties in terms of control.
  • the object is achieved according to the invention by the features of claims 1 and 12, while advantageous refinements and developments of the invention can be found in the subclaims.
  • the invention is based on a cooking appliance device, in particular an induction hob device, with at least one control unit, which is intended to repeatedly control at least one induction target and to supply it with energy in at least one periodic continuous heating operating state, to which at least one operating period is assigned, and to supply the induction target in at least one Switch-on interval of the operating period to operate with a heating output.
  • control unit is intended to operate the induction target in the switch-on interval of the operating period with a substantially constant heating current frequency and to vary a duty cycle.
  • a “substantially constant” operating parameter is to be understood as meaning that the operating parameter, for example the heating frequency and/or a real conductance and/or a complex conductance and/or an impedance and/or another operating parameter of the cooking device and/or one the cooking appliance having a cooking appliance, except for deviations of a maximum of 10%, preferably a maximum of 8%, particularly preferably a maximum of 5%, has a constant value over at least 70%, preferably at least 80%, particularly preferably at least 90% of a corresponding period of time.
  • Operating parameters can be kept constant by the control unit, either directly or indirectly, that is, by controlling at least one further operating parameter.
  • control unit is intended to continuously change the duty cycle in the switch-on interval in the continuous heating operating state.
  • continuously changing is to be understood as meaning that the duty cycle in the switch-on interval is changed, in particular adjusted, at constant intervals at least ten times, preferably at least twenty times, preferably at least twenty-five times, particularly preferably at least fifty times.
  • control unit is intended to repeatedly control at least one further induction target in the continuous heating operating state and to supply it with energy and to operate the further induction target with a heating output in at least one further switch-on interval of the operating period.
  • control unit is intended to repeatedly control at least one further induction target in the continuous heating operating state and to supply it with energy and to operate the further induction target with a heating output in at least one further switch-on interval of the operating period.
  • control unit is provided, in the continuous heating operating state, to operate a further heating current frequency for the second induction target in the further switch-on interval of the operating period with a substantially constant further heating current frequency and to vary a further duty cycle.
  • control unit is intended to at least minimize intermodulation noise between the induction target and the further induction target in the continuous heating operating state. This can advantageously enable simultaneous operation of at least two induction targets while complying with EMC standards.
  • the invention also relates to a cooking appliance, in particular a hob, with at least one cooking appliance device according to one of the previously described embodiments.
  • a cooking appliance is characterized in particular by the previously described advantageous properties of the cooking appliance device.
  • the invention is further based on a method for operating a cooking appliance device, in particular an induction hob device, in particular according to one of the previously described embodiments, wherein in at least one periodic continuous heating operating state, to which at least one operating period is assigned, at least one induction target is repeatedly controlled and supplied with energy and the induction target is operated with a heating output in at least one switch-on interval of the operating period.
  • the cooking appliance device should not be limited to the application and embodiment described above.
  • the cooking appliance device can have a number of individual elements, components and units that deviate from the number mentioned herein.
  • FIG. 1 shows a cooking appliance with a cooking appliance device in a schematic representation
  • FIG. 2 shows a schematic electrical circuit diagram of the cooking appliance device with a control unit, several inverter units, resonance capacitor units and induction targets,
  • Fig. 4b is a schematic diagram showing a time course of a theoretical power provided by the inverter unit when operating a purely ohmic load and a real power provided by the inverter unit when operating the induction target without varying the duty cycle by the control unit and when reducing the power at the beginning and at the end of the operating period,
  • 4c is a schematic diagram showing a time course of a variation of the duty cycle by the control unit in a first switch-on interval of the operating period
  • FIG. 5 shows a schematic diagram of a time course of the real conductance of the at least one resonant circuit having the induction target within the first switch-on interval when the duty cycle is varied by the control unit
  • Fig. 6a is a schematic diagram showing a course of the real conductance of a resonant circuit having the induction target without Variation of a duty cycle by the control unit and when reducing power at the maximum amount of a rectified AC mains voltage within the operating period,
  • Fig. 6b is a schematic diagram to show a time course of a theoretical power provided by the inverter unit when operating a purely ohmic load and a real power provided by the inverter unit when operating the induction target without varying the duty cycle by the control unit and when reducing at the maximum amount rectified AC mains voltage within the operating period,
  • 6c is a schematic diagram showing a time course of a variation of the duty cycle by the control unit in a second switch-on interval of the operating period
  • FIG. 8 shows a schematic diagram of a time course of a complex conductance of the at least one resonant circuit having the induction target within the first switch-on interval when the duty cycle is varied by the control unit and
  • Fig. 9 is a schematic process flow diagram of a method for operating the cooking device.
  • FIG. 1 shows a cooking appliance 50 in a schematic representation.
  • the cooking appliance 50 is designed as a hob 52, specifically as an induction hob.
  • the cooking appliance 50 has a mounting plate 80, which in the present case is designed as a hob plate of the hob 52.
  • the cooking appliance 50 has a cooking appliance device 10. This is the case
  • FIG. 2 shows a schematic electrical circuit diagram of the cooking appliance device 10.
  • the cooking appliance device 10 has four inductors 58, 60, 62, 64. Alternatively, however, the cooking appliance device 10 could have any other number of inductors 58, 60, 62, 64, which is greater than or equal to one.
  • the inductors 58, 60, 62, 64 are arranged below the mounting plate 80 of the cooking appliance 50 (see FIG. 1) when the cooking appliance device 10 is in an assembled state.
  • a first inductor 58 forms an induction target 18 with a first cooking utensil 66.
  • the control unit 12 is intended to repeatedly control and supply at least the induction target 18 with energy in at least one periodic continuous heating operating state, to which at least one operating period 16 (see FIG. 4a) is assigned, and to control the induction target 18 in at least one switch-on interval 26, 44 ( see Figures 4c and 6c) of the operating period 16 to operate with a heating output.
  • the cooking appliance device 10 has at least one resonance capacitor unit 82, with a first resonance capacitor 84 and a second resonance capacitor 86.
  • the cooking appliance device 10 has a total of four resonance capacitor units 82, each with a first resonance capacitor 84 and a second resonance capacitor 86.
  • each of the inverter units 74 is assigned a resonance capacitor unit 82.
  • Figure 3 shows a schematic electrical circuit diagram of the inverter unit 74 of the cooking appliance device 10 with the resonance capacitor unit 82 and the induction target 18.
  • the control unit 12 is intended to keep at least one real conductance 32 (cf. Figures 4a and 5) of at least one resonant circuit 34 having the induction target 18 at least substantially constant in the continuous heating operating state within a first switch-on interval 26 by varying the duty cycle 30.
  • the inverter unit 74 forms the at least one resonant circuit 34 with the induction target 18 and the resonance capacitor unit 82.
  • the control unit 12 controls the first inverter switching element 76 of the inverter unit 74 to operate the induction target 18 with the essentially constant heating frequency, so that a voltage Vo drops across the inverter switching element, which is half of a Bus capacitor voltage V bus corresponds to which a bus capacitor (not shown), which is arranged electrically in parallel to the inverter unit 74, is charged at the beginning of the operating period 16.
  • An amount of the bus capacitor voltage V bus at the beginning of the operating period in turn corresponds to a peak value of a rectified AC mains voltage (not shown).
  • the first inverter switching element 76 of the inverter unit 74 forms the resonant circuit 34 with the induction target 18 and the first resonance capacitor 84.
  • a voltage V RL drops across the induction target 18 within the operating period 16 and an alternating current l flows within the resonant circuit 34.
  • the second inverter switching element 76 of the inverter unit 74 forms a further resonant circuit (not shown) with the induction target 18 and the second resonance capacitor 86 of the resonance capacitor unit 82.
  • FIG. 4a shows a schematic diagram to show a course of the real conductance 32 of the resonant circuit 34 having the induction target 18 in the event that the duty cycle 30 does not vary in the first switch-on interval 26 and a power provided via the inverter unit 74 at the beginning and at the end of the Operating period 16, when an amount of the rectified AC mains voltage is minimal, is reduced.
  • a time in seconds is plotted on an abscissa 54 of the diagram.
  • a conductance in milliohm -1 is plotted on an ordinate 56 of the diagram.
  • the conductance 32 has a curve-shaped time course with maximum values of approximately 100 milliohm -1 and a minimum value of approximately 50 milliohm -1 within the first switch-on interval 26, the duration of which in the present case corresponds to the duration of the operating period 16, if the duty cycle 30 is not varied in the first switch-on interval 26.
  • FIG. 4b shows a time course of a theoretical power 28 provided by the inverter unit 74 when operating a purely ohmic load and a real power 38 provided by the inverter unit 74 when operating the induction target 18 in the event that the duty cycle 30 does not vary in the first switch-on interval 26 and a power provided via the inverter unit 74 at the beginning and at the end of the operating period 16, when an amount of the rectified AC mains voltage is minimal, is reduced.
  • a time in seconds is plotted on an abscissa 88.
  • a power in watts is plotted on an ordinate 90.
  • the theoretical power 28 is lower than the real power 38, since inductive and capacitive reactive power losses occur in the resonant circuit 34 shown in Figure 3.
  • the aim of the present invention is to achieve an almost purely ohmic behavior by varying the duty cycle 30 and thereby to minimize these reactive power losses within the first switch-on interval 26.
  • Control unit 12 in the first switch-on interval 26 On an abscissa 92 of the
  • FIG. 5 shows a schematic diagram of a time course of the real conductance 32 of the at least one resonant circuit 34 having the induction target 18 (cf.
  • FIG. 6a shows a schematic diagram to show a course of the real conductance 32 of the resonant circuit 34 having the induction target 18 in the event that the duty cycle 30 does not vary in a second switch-on interval 44 and a power provided via the inverter unit 74 at the maximum amount of the rectified AC mains voltage is reduced within the operating period 16.
  • a time in seconds is plotted on an abscissa 100 of the diagram.
  • a conductance in milliohm -1 is plotted on an ordinate 102 of the diagram.
  • the conductance 32 has a curve-shaped time course within the second switch-on interval 44 with maximum values of approximately 120 milliohms -1 and a minimum value of approximately 70 milliohms -1 if the duty cycle 30 does not vary in the second switch-on interval 44 becomes.
  • FIG. 6b shows a time course of the theoretical power 28 provided by the inverter unit 74 when operating a purely ohmic load and a real power 38 provided by the inverter unit 74 when operating the induction target 18 in the event that the duty cycle 30 does not vary in the second switch-on interval 44 and the power provided via the inverter unit 74 is reduced at the maximum amount of the rectified AC mains voltage within the operating period 16.
  • a time in seconds is plotted on an abscissa 104.
  • a power in watts is plotted on an ordinate 106.
  • the theoretical power 28 is much lower than the real power 38, since inductive and capacitive reactive power losses again occur in the resonant circuit 34 shown in Figure 3.
  • 6c shows a time course of a variation of the duty cycle 30 by the control unit 12 in the second switch-on interval 44.
  • a time in seconds is plotted on an abscissa 108 of the diagram.
  • a duty cycle is plotted as a dimensionless parameter on an ordinate 110 of the diagram.
  • the control unit 12 is intended to vary the duty cycle 30 during the at least one second switch-on interval 44 within a second duty cycle range 46, with duty cycles greater than or equal to the maximum power duty cycle 42. In the present case, the control unit 12 is intended to continuously change the duty cycle 30 in the second switch-on interval 44 in the continuous heating operating state.
  • FIG. 7 shows a schematic diagram of a time course of the real conductance 32 of the at least one resonant circuit 34 having the induction target 18 (cf.
  • a conductance in milliohm -1 is plotted on an ordinate 118 of the diagram. As can be seen from the diagram, it is possible to keep the complex conductance 36 of the at least one resonant circuit 34 having the induction target 18 at least essentially constant within the first switch-on interval 26 by the variation of the duty cycle 30 shown in FIG. 4c.
  • the control unit 12 is also intended to keep at least one impedance (not shown) of the at least one resonant circuit 34 having the induction target 18 at least substantially constant within the first switch-on interval 26 by varying the duty cycle 30 in the continuous heating operating state. Since the real conductance 32 (see Figure 5) represents the reciprocal of the real part of the impedance of the at least one resonant circuit 34 having the induction target 18 and the complex conductance 36 represents the reciprocal of the imaginary part of the impedance of the at least one resonant circuit 34 having the induction target 18 and both the real conductance 32 as well as the complex conductance 36 are kept at least essentially constant by varying the duty cycle 30 within the first switch-on interval 26, the impedance of the at least one resonant circuit 34 having the induction target 18 also remains within the first switch-on interval 26 due to the variation of the duty cycle 30 at least essentially constant.
  • the method includes at least two method steps 120, 122.
  • a first method step 120 of the method in the at least one periodic continuous heating operating state, to which the at least one operating period 16 is assigned, at least one induction target 18 is repeatedly controlled and supplied with energy and the induction target 18 is operated with a heating power in at least one switch-on interval 26, 44 of the operating period 16, the heating current frequency being kept essentially constant .
  • the duty cycle 30 is varied in the continuous heating operating state in at least one of the switch-on intervals 26, 44 of the operating period 16.

Landscapes

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

Abstract

L'invention concerne un appareil de cuisson (10), en particulier un dispositif de table de cuisson à induction, comprenant au moins une unité de commande (12) qui est prévue, dans au moins un mode de chauffage synchronisé périodique (50) associé à au moins un temps de fonctionnement (16), pour commander et fournir de manière répétitive de l'énergie à au moins une zone d'induction (18) et pour faire fonctionner la zone d'induction (18) avec une puissance de chauffage dans au moins un intervalle de temps de MARCHE (26, 44) du temps de fonctionnement (16). Afin de proposer un appareil de cuisson ayant des propriétés de commande améliorées, l'unité de commande (12) est prévue pour faire fonctionner la zone d'induction (18) à une fréquence de courant de chauffage sensiblement constante pendant l'intervalle MARCHE (26, 44) et pour faire varier un cycle de service (30).
EP23745088.7A 2022-08-30 2023-07-06 Appareil de cuisson Pending EP4581902A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22382807 2022-08-30
PCT/EP2023/068687 WO2024046629A1 (fr) 2022-08-30 2023-07-06 Appareil de cuisson

Publications (1)

Publication Number Publication Date
EP4581902A1 true EP4581902A1 (fr) 2025-07-09

Family

ID=83232716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23745088.7A Pending EP4581902A1 (fr) 2022-08-30 2023-07-06 Appareil de cuisson

Country Status (2)

Country Link
EP (1) EP4581902A1 (fr)
WO (1) WO2024046629A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092509A (en) * 1975-05-12 1978-05-30 Mitchell Mclaren P Induction heating appliance circuit that produces relatively high frequency signals directly from a relatively low frequency AC power input
ES2143430B1 (es) * 1998-09-08 2000-12-16 Balay Sa Circuito inversor de dos salidas, y circuito y procedimiento de control de la potencia entregada en las salidas del inversor.
DE102006041964A1 (de) * 2006-08-25 2008-04-03 E.G.O. Elektro-Gerätebau GmbH Verfahren und Anordnung zur Leistungsversorgung einer Induktionsheizeinrichtung
EP3771288B1 (fr) 2009-10-05 2021-12-15 Whirlpool Corporation Procédé de fourniture de puissance à des zones de cuisson par induction d'une plaque de cuisson par induction dotée d'une pluralité de convertisseurs de puissance, et plaque de cuisson par induction utilisant ledit procédé
CH703021B1 (de) * 2010-04-30 2014-11-14 Inducs Ag Schaltungsanordnung für ein Induktionskochgerät, Verfahren zum Betreiben der Schaltungsanordnung für ein Induktionskochgerät.
ES2564888B1 (es) 2014-09-24 2017-01-05 BSH Electrodomésticos España S.A. Dispositivo de aparato de cocción y procedimiento para la puesta en funcionamiento de un dispositivo de aparato de cocción
DE102021201220A1 (de) * 2021-02-09 2022-08-11 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Betreiben einer Vorrichtung zum drahtlosen Übertragen von Energie in Richtung eines elektrischen Verbrauchers mittels induktiver Kopplung, Vorrichtung und System

Also Published As

Publication number Publication date
WO2024046629A1 (fr) 2024-03-07

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