EP2692203B1 - Dispositif de chauffage par induction - Google Patents

Dispositif de chauffage par induction Download PDF

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Publication number
EP2692203B1
EP2692203B1 EP12713358.5A EP12713358A EP2692203B1 EP 2692203 B1 EP2692203 B1 EP 2692203B1 EP 12713358 A EP12713358 A EP 12713358A EP 2692203 B1 EP2692203 B1 EP 2692203B1
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EP
European Patent Office
Prior art keywords
induction heating
units
unit
heating
frequency
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.)
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Application number
EP12713358.5A
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German (de)
English (en)
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EP2692203A1 (fr
Inventor
Daniel Anton Falcon
Miguel Angel BUÑUEL MAGDALENA
Jose-Ramon Garcia Jimenez
Jose Andres Garcia Martinez
Ignacio Garde Aranda
Pablo Jesus Hernandez Blasco
Sergio Llorente Gil
Alfonso Lorente Perez
David Ortiz Sainz
Ramon Peinado Adiego
Carmelo Pina Gadea
Diego Puyal Puente
Julio Rivera Peman
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2692203A1 publication Critical patent/EP2692203A1/fr
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    • 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

Definitions

  • the invention is based on an induction heating device according to the preamble of claim 1.
  • Induction hobs are known from the prior art, which have a control unit, at least two Schufrequenzüen and at least two induction heating units.
  • EP 0 817 531 A2 or EP 0 844 807 A1 describe induction cooking devices with a boost mode.
  • the object of the invention is in particular to provide a generic device with increased efficiency.
  • the object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.
  • the invention is based on an induction heating device, in particular an induction hob device, with at least one control unit, at least two heating frequency units and at least two induction heating units. It is proposed that the control unit is provided, in at least one operating mode in which the at least two induction heating units are operated alternately, to operate the induction heating units in each case in a boost mode.
  • a “control unit” is to be understood in particular as an electronic unit which is preferably at least partially integrated in a control and / or regulating unit of an induction heating device and which is preferably provided to control and / or regulate at least the heating frequency units.
  • the control unit preferably comprises a computing unit and, in particular in addition to the computing unit, a memory unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit.
  • a “heating frequency unit” is to be understood in particular as meaning an electrical unit which generates an oscillating electrical signal, preferably with a heating frequency of at least 1 kHz, in particular of at least 10 kHz, advantageously of at least 20 kHz and in particular of not more than 100 kHz for an induction heating unit.
  • the heating frequency unit is provided to provide a maximum electrical power of at least 1000 W, in particular at least 2000 W, advantageously at least 3000 W, and preferably at least 3500 W, required by the induction heating unit.
  • the heating frequency unit comprises in particular at least one inverter, which preferably has at least two, preferably series-connected, bidirectional unipolar switches, which are in particular formed by a transistor and a diode connected in parallel, and particularly advantageously at least one damping capacitor connected in parallel to the bidirectional unipolar switches, which is in particular formed by at least one capacitor.
  • a voltage tap of the radio-frequency unit is arranged in particular at a common contact point of two bidirectional unipolar switches.
  • an “induction heating unit” is to be understood in particular as a unit having at least one induction heating element. In particular, in an operating state in which the induction heating unit is supplied with high-frequency alternating current, all induction heating elements of the induction heating unit, preferably simultaneously, supplied with high-frequency alternating current.
  • An “induction heating element” is to be understood in particular as a wound electrical conductor, preferably in the form of a circular disk through which high-frequency alternating current flows in at least one operating state.
  • the induction heating element is preferably provided to convert electrical energy into an alternating magnetic field, which is intended to cause in a metallic, preferably at least partially ferromagnetic, heating means, in particular cooking utensils, eddy currents and / or remagnetization effects, which are converted into heat.
  • a metallic, preferably at least partially ferromagnetic, heating means in particular cooking utensils, eddy currents and / or remagnetization effects, which are converted into heat.
  • a distance between two starting points of directly successive operating sections of any induction heating units is a multiple of 50 ms or a multiple of 100 ms.
  • a "operation section" of an induction heating unit in particular, a period of time in which the induction heating unit is operated continuously with a high-frequency alternating current which in particular has at least one heating frequency which is greater than 1 kHz, and in which the induction heating unit obtains a power, in particular greater than 50 W and preferably greater than 100 W. is.
  • boost mode should in particular be understood to mean an operating state in which an induction heating unit is supplied at the same time by at least two heating-frequency units, preferably all heating-frequency units.
  • the induction heating unit is directly connected to the voltage taps of at least two heating frequency units.
  • a "direct connection” is to be understood in particular as meaning an electrical connection which, at least in an operating state with a current flow of alternating current via the connection with a heating frequency between 1 kHz and 100 kHz, has an impedance which is smaller than its magnitude 10 V / A, in particular less than 1 V / A, preferably less than 0.1 V / A, and the amount thereof in particular over a heating frequency range of 1 kHz to 100 kHz by a maximum of 100%, in particular a maximum of 40%, advantageously a maximum 10% and preferably at most 3% varies.
  • the control unit is provided to control the at least two heating frequency units in a boost mode with the same heating frequency and preferably at the same time.
  • amplitudes of the high-frequency alternating currents generated by the at least two heating frequency units differ by less than 50%, in particular less than 30%, advantageously less than 10% and preferably less than 5%.
  • the closest mutually adjacent maxima of the different high-frequency alternating currents, which are generated by the at least two heating frequency units are spaced apart by less than 5 ⁇ s, in particular less than 1 ⁇ s, advantageously less than 0.5 ⁇ s and preferably less than 0.1 ⁇ s.
  • the control unit is provided to determine a number of heating frequency units, which is intended to supply the induction heating units to be operated, in dependence on a sum of services requested for the induction heating units.
  • At least two heating-frequency units are used from a total power of at least 600 W, and from a total power of at least 900 W, if present, at least three heating-frequency units.
  • the control unit in an operating mode with alternating operation of the induction heating units, is provided to use a maximum of so many heating frequency units, each of which supplies a minimum power of at least 300 W in particular it is avoided to recall less than 50 W of power over a period of more than 100 ms.
  • a cost saving can be achieved, since two heating-frequency units which are intended to provide at most an average power, in particular a power less than 2500 W, preferably less than 1800 W, are more favorable than a heating-frequency unit which is intended to a high line, in particular a power greater than 3000 W, advantageously greater than 4000W and preferably greater than 5000 W to provide.
  • at least two induction heating units have a common contact, to which a resonance unit is connected in at least one operating state.
  • a “resonance unit” is to be understood in particular as a unit which comprises at least one resonance capacitance, which is preferably formed by at least one capacitor, which differs preferably from a damping capacity and / or a capacitance which is connected in parallel with a switching element.
  • a resonant capacitance is formed by a combination of series and parallel circuits of a plurality of capacitors.
  • the resonance capacity is in particular part of an electrical resonant circuit, in particular of an electrical series resonant circuit.
  • the resonance capacitance in at least one operating state is connected in series with the induction heating unit and is particularly advantageously intended to be charged via the induction heating unit by at least one heating frequency unit, in particular if the induction heating unit is switched to a higher electrical potential by a switching arrangement is placed.
  • the resonance capacity is arranged in particular on a side of the induction heating unit facing away from the frequency unit, viewed in the direction of a line path.
  • an induction heating unit is operated in a full bridge circuit.
  • the induction heating unit is arranged together with a, preferably in series with the induction heating unit, resonant capacitance between two voltage dividing units formed by Schufrequenzüen in the bridge branch.
  • an induction heating unit is operated in a half-bridge circuit.
  • the induction heating unit is arranged between a voltage divider formed by the heating frequency unit and a voltage divider formed by two resonance capacitances in the bridge branch.
  • the heating frequency units are intended to be operated over a single phase.
  • a single, connected to the phase rectifier is provided by the heating frequency units are supplied with pulsating DC voltage.
  • costs and / or components can be saved.
  • the heating frequency units are designed to operate at least one of the induction heating units, in particular in a boost mode, with a power of at least 3000 W, in particular at least 3500 W and preferably at least 4000W.
  • at least one of the induction heating units is designed to be operated with a power of at least 3000 W, in particular at least 3500 W and preferably at least 4000 W.
  • an increase in comfort can be achieved by a particularly rapid heating.
  • the heating frequency units are designed to provide a total power which is at least 110%, in particular at least 120%, in particular at most 140%, advantageously at most 150%, of a maximum of maximum powers of the induction heating units.
  • increased comfort can be achieved.
  • the induction heating device has at least one further induction heating unit and a switching arrangement which is provided, preferably by switching commands of the control unit, at least three, in particular at least six, advantageously at least ten, different combinations of at least one of the at least two Schufrequenzüen and at least one of the at least three induction heating units directly to each other.
  • the switching arrangement has at least two switching elements, which in particular are both arranged between the first induction heating unit and the first heating frequency unit.
  • the switching elements By arranging the switching elements "between" the heating frequency unit and the induction heating unit, it should be understood in particular that in an operating state in which the induction heating unit is supplied with high-frequency alternating current, the induction heating unit with the switching means in any order on a single contact, preferably a voltage tap, the heating frequency unit are arranged in series.
  • the first switching element with the Schufrequenzü with the first switching element, the second switching element and the second switching element, the induction heating directly connected.
  • the control unit is at least provided to at least two of the induction heating units alternately, preferably periodically alternately, in particular with a period of maximum 7 s, in particular a maximum of 5 s, preferably a maximum of 2 s, to provide about one of the heating frequency units with high-frequency alternating current, in addition in particular, the switching states of the switching arrangement and / or the switching frequency of the heating frequency unit can be changed by the control unit.
  • a flexible, cost-reducing induction heating device can be provided.
  • reduced wear can be achieved by less frequent control of switching elements of the switching arrangement.
  • FIG. 1 shows a formed as an induction hob home appliance 10 with an induction heating device designed as an induction heating 12 with four induction heating 20, 22, 24, 26, each having an induction heating element designed as an inductor.
  • the induction heating units 20, 22, 24, 26 are disposed below a cooktop panel 14.
  • the induction heating device 12 has a power module 18 operated by a single phase 16 of a three-phase in-house connection, which is provided to supply the induction heating units 20, 22, 24, 26 with high-frequency alternating current with a switching frequency between 20 kHz and 100 kHz ,
  • the power module 18 has two heating frequency units 30, 32, which are intended to be operated via the single phase 16 and to supply the induction heating units 20, 22, 24, 26 ( Fig. 2 ).
  • the switching frequency of the heating frequency units 30, 32 is dependent inter alia on a heating power requested for the induction heating unit 20, 22, 24, 26 via an operating unit 28 and a cooking utensil which is located in a cooking zone on the hob plate 14 above the induction heating unit 20, 22, 24, 26, and is determined by a control unit 34 of the induction heater 12.
  • the control unit 34 has an arithmetic unit, a memory unit and an operating program stored in the memory unit, which is intended to be executed by the arithmetic unit.
  • FIG. 2 shows a circuit for the induction heater 12.
  • a voltage applied to a phase 16 between 220 V and 230 V with a mains frequency between 49 Hz and 51 Hz is rectified in a rectifier 36 and stored in a buffer capacity 38 partially.
  • the poles of the buffer capacitor 38 form two external contacts 40, 42 between which a pulsating DC voltage is applied.
  • the Schufrequenzüen 30, 32 are disposed between the outer contacts 40, 42 and convert the pulsating DC voltage into high-frequency alternating current.
  • the Schufrequenztechniken 30, 32 each have two between the outer contacts 40, 42 connected in series, designed as a bidirectional unipolar switch, switching elements 44, 46 each having a parallel-connected damping capacitor 48, 50 on.
  • the switching elements 44, 46 are each formed by an IGBT 52, 54 (insulated gate bipolar transistor) and a parallel connected diode 56, 58.
  • a voltage tap 60, 62 is arranged in each case at a common contact of the two IGBTs 52, 54.
  • the control unit 34 causes by alternating, high-frequency control of the two IGBTs 52, 54 at the voltage tap 60 a high-frequency alternating voltage with pulsating amplitude, which follows a high-frequency alternating current when connecting an induction heating unit 20, 22, 24, 26.
  • the voltage taps 60, 62 of the heating frequency units 30, 32 are connected to a switching arrangement 64 which has four switching elements 66, 68, 70, 72 formed by relays.
  • the switching element 66 is designed as a single-pole power switch and is intended to connect the voltage taps 60, 62 of the heating frequency units directly.
  • the three switching elements 68, 70, 72 are designed as single-pole changeover switches and provided to connect one of the induction heating units directly to the voltage tap 60 of the induction heating unit 30.
  • the switching arrangement 64 is provided by switching commands of the control unit 34 to directly connect eight different combinations of up to two of the two heating frequency units 30, 32 and up to two of the four induction heating units 20, 22, 24, 26.
  • the switching elements 68, 70, 72 each have three contacts and two switching states.
  • the first contact In a first switching state, the first contact is directly connected to the second contact and in a second switching state, the first and the third contact are directly connected (in the illustration, the first contact is arranged on the left and the second contact on the top right).
  • the switching elements 68, 70, 72 are arranged in a cascaded circuit.
  • a first contact of the switching element 68 is connected directly to the voltage tap 60 of the heating frequency unit 30.
  • a second and a third contact of the switching element 68 is in each case directly connected to a first contact of the two switching elements 70, 72.
  • the induction heating units 20, 22, 24, 26 are each directly connected to one of the second or third contacts of the switching elements 70, 72.
  • Each of the induction heating units 20, 22, 24, 26 can thus be directly connected to the heating frequency unit 30 individually by suitable switching states of the switching elements 68, 70, 72. Furthermore, each of the induction heating units 20, 22, 24, 26 may be directly connected in a boost mode to both heating frequency units 30, 32.
  • the Induction heating units 20, 22, 24, 26 are each operated in a half-bridge circuit.
  • the induction heating units 20, 22 and 24, 26 each have a common contact 78, 79 which is in each case directly connected to a resonance unit 80, 81 which is formed by two resonance capacitances 82, 84 and 83, 85 formed from individual capacitors ,
  • the resonant capacitances 82, 84 and 83, 85 are each connected in series and one of the resonant capacitances 82, 83 is connected directly to one of the external contacts 40 and the other of the resonant capacitors 84, 85 is connected directly to the other external contact 42.
  • Both of the resonance capacitances 82, 84 and 83, 85 are each directly connected to the two induction heating units 20, 22 and 24, 26, respectively.
  • the resonance units 80, 81 have capacitances adapted to the induction heating units 20, 22 and 24, 26, respectively.
  • the induction heating device 12 thus has a control unit 34, four induction heating units 20, 22, 24, 26 and two heating frequency units 30, 32.
  • the induction heating unit 20 is designed to supply a power of up to 3600 W to a cooking utensil.
  • the induction heating unit 22 is designed to transmit a power of up to 3000 W to a cooking utensil.
  • the induction heating units 24 and 26 are designed to pass a power of 2000 W each to a cooking utensil.
  • the heating frequency units 30, 32 are designed to provide a total power of 4600W. Each of the heating frequency units 30, 32 is configured to provide a power of 2300W.
  • the heating frequency units 30, 32 are adapted to operate in a boost mode, the induction heating unit 20 with a power of 3600 W. Likewise, the heating frequency units 30, 32 are configured to provide a total power that is 130% of a maximum of maximum powers of the induction heating units 20, 22, 24, 26.
  • the control unit 34 is provided to operate the induction heating units 20, 22, 24, 26 each in a boost mode in an operation mode in which two or more of the induction heating units 20, 22, 24, 26 are alternately operated.
  • the switching element 66 is closed and the heating frequency units 30, 32 are operated at the same frequency, which is dependent on a total requested for the induction heating units power.
  • FIG. 3 shows an exemplary operation for three active induction heating units 20, 22, 24 based on five diagrams.
  • the performances P 30 , P 32 of the heating frequency units 30, 32 are shown and in the lower diagrams in each case the powers P 20 , P 22 , P 24 , which are implemented in the induction heating units 20, 22, 24.
  • the outputs of the heating frequency units 30, 32 outputs P 1 , P 2 are the same size and correspond in their sum to the sum of the induction heating units 20, 22, 24 requested services P 20 ', P 22 ', P 24 '.
  • the switching arrangement 64 is switched so that the induction heating unit 20 is connected directly to the voltage tap 60.
  • the induction heating unit 20 is simultaneously operated by both heating frequency units 30, 32.
  • a second operating section 92 directly following the first operating section 90 the induction heating unit 22 is operated.
  • Starting points 91, 93 of the operating sections 90, 92 are spaced at 100 ms.
  • Between the operating sections 90, 92 is a pause of 7 ms, which serves to switch the switching element 70 so that instead of the induction heating unit 20, the induction heating unit 22 is now connected directly to the voltage tap 60.
  • a third operating section 94 directly following the second operating section 92 the induction heating unit 24 is operated.
  • Starting points 93, 95 of the operating sections 92, 94 are spaced at 800 ms.
  • This mode of operation may also be performed with only two or more than three induction heating units 20, 22, 24, 26. If a sum of the powers required for the induction heating units 20, 22, 24, 26 is less than 600 W, the heating frequency unit 32 is turned off and its direct connection to the voltage tap 60 is interrupted by opening the switching element 66.
  • At least one further heating frequency unit is provided to be connected with its voltage tap via a switching element directly to the voltage tap 60.
  • switching arrangements are conceivable in which find alternative switching arrangements application.
  • switching arrangements are conceivable which can connect each of the induction heating units with any desired heating frequency units.

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

Claims (5)

  1. Dispositif de champ de cuisson à induction avec au moins une unité de commande (34), au moins deux unités de fréquence de chauffe (30, 32) et au moins deux unités de chauffe à induction (20, 22, 24, 26), caractérisé en ce que l'unité de commande (34) est prévue, dans au moins un mode d'exploitation dans lequel les au moins deux unités de chauffe à induction (20, 22, 24, 26) sont exploitées en alternance, afin d'exploiter les unités de chauffe à induction (20, 22, 24, 26) respectivement selon un mode boost.
  2. Dispositif de champ de cuisson à induction selon la revendication 1, caractérisé en ce que les unités de fréquence de chauffe (30, 32) sont prévues afin d'être exploitées via une seule phase (16).
  3. Dispositif de champ de cuisson à induction selon l'une des revendications précédentes, caractérisé en ce que les unités de fréquence de chauffe (30, 32) sont dimensionnées afin d'exploiter au moins une des unités de chauffe à induction (20, 22, 24, 26) selon une puissance minimale de 2900 W.
  4. Dispositif de champ de cuisson à induction selon l'une des revendications précédentes, caractérisé en ce que les unités de fréquence de chauffe (30, 32) sont dimensionnées afin de fournir une puissance totale correspondant au minimum à 110% d'un maximum de puissances maximales des unités de chauffe à induction (20, 22, 24, 26).
  5. Dispositif de champ de cuisson à induction selon l'une des revendications précédentes, caractérisé par au moins une unité de chauffe à induction supplémentaire (20, 22, 24, 26) et un dispositif de commutation (64) prévu afin de relier directement l'une à l'autre, par des commandes de commutation d'une unité de commande (34), au moins trois combinaisons différentes d'au moins une des au moins deux unités de fréquence de chauffe (30, 32) et au moins une des au moins trois unités de chauffe à induction (20, 22, 24, 26).
EP12713358.5A 2011-03-30 2012-03-19 Dispositif de chauffage par induction Active EP2692203B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201130495 2011-03-30
PCT/IB2012/051307 WO2012131528A1 (fr) 2011-03-30 2012-03-19 Dispositif de chauffage par induction

Publications (2)

Publication Number Publication Date
EP2692203A1 EP2692203A1 (fr) 2014-02-05
EP2692203B1 true EP2692203B1 (fr) 2016-05-25

Family

ID=45937489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12713358.5A Active EP2692203B1 (fr) 2011-03-30 2012-03-19 Dispositif de chauffage par induction

Country Status (3)

Country Link
EP (1) EP2692203B1 (fr)
ES (1) ES2575091T3 (fr)
WO (1) WO2012131528A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2128941B1 (es) * 1996-06-26 2000-01-16 Balay Sa Circuito inversor de configuracion variable.
ES2128958B1 (es) * 1996-11-21 2000-01-16 Balay Sa Procedimiento de control de potencia en cocinas de induccion alimentadas mediante inversores multipuente reconfigurables.
DE102006058874A1 (de) * 2006-12-06 2008-06-19 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Steuern von Induktionsheizeinrichtungen bei einem Elektokochgerät

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ES2575091T3 (es) 2016-06-24
WO2012131528A1 (fr) 2012-10-04
EP2692203A1 (fr) 2014-02-05

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