EP2506670B1 - Dispositif de chauffage à induction - Google Patents

Dispositif de chauffage à induction Download PDF

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Publication number
EP2506670B1
EP2506670B1 EP12160670.1A EP12160670A EP2506670B1 EP 2506670 B1 EP2506670 B1 EP 2506670B1 EP 12160670 A EP12160670 A EP 12160670A EP 2506670 B1 EP2506670 B1 EP 2506670B1
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EP
European Patent Office
Prior art keywords
unit
induction heating
frequency
units
heating
Prior art date
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Active
Application number
EP12160670.1A
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German (de)
English (en)
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EP2506670A3 (fr
EP2506670A2 (fr
Inventor
Daniel Anton Falcon
Ignacio Garde Aranda
Pablo Jesus Hernandez Blasco
Sergio Llorente Gil
Arturo Mediano Heredia
Diego Puyal Puente
Magdy Saoudi
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication date
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Publication of EP2506670A2 publication Critical patent/EP2506670A2/fr
Publication of EP2506670A3 publication Critical patent/EP2506670A3/fr
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Publication of EP2506670B1 publication Critical patent/EP2506670B1/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
    • 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 cooktops with a first and a second inverter, two inductors, which are associated with the first heating frequency unit and two inductors, which are associated with the second heating frequency unit known.
  • document WO 2009/056452 A1 discloses an induction hob according to the prior art.
  • the object of the invention is in particular to provide a generic device with improved comfort. 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 first and one second heating frequency unit, at least one first induction heating unit associated with the first heating frequency unit and at least one second induction heating unit associated with the second heating frequency unit. It is proposed that the induction heating device has a resonance unit to which the two induction heating units are assigned.
  • a "heating frequency unit” is to be understood in particular as meaning an electrical unit which generates an oscillating electrical signal, preferably at a 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 at least one inverter, which preferably has at least two, preferably series-connected, bidirectional unipolar switches, in particular of a transistor and a parallel diode are formed, and particularly advantageous at least in each case a parallel to the bidirectional unipolar switches switched damping capacity, which is in particular formed by at least one capacitor comprises.
  • a high-frequency power supply of the induction heating unit can be provided.
  • 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.
  • the fact that an induction unit of a heating frequency unit is "assigned" should in particular mean that the induction heating unit is connected directly to the heating frequency unit, in particular a power tap of the heating frequency unit, and in particular in each operating state in which the induction heating unit is traversed by high-frequency alternating current differs from an induction heating unit directly connected to more than one heating frequency unit.
  • 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 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 frequency range from 1 kHz to 100 kHz by a maximum of 100%, in particular a maximum of 40%, advantageously not more than 10 % and preferably at most 3% varies.
  • a “resonance unit” is to be understood in particular as meaning a unit which has at least one resonance capacitance, which is preferably formed by at least one capacitor, which is preferably different from a damping capacity and / or a capacitance 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 raised to a higher electrical potential by the 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 induction heating apparatus has a control unit which is arranged to operate the induction heating units simultaneously in a phase-delayed drive 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 "phase-delayed control mode" is to be understood, in particular, as a mode in which two induction heating units are simultaneously connected directly to different heating-frequency units and in which the heating-frequency units are connected to one another via the two induction heating units.
  • the heating frequency units preferably operate at the same set frequency and a power output via the induction heating units depends in particular on the set frequency, a phase shift of the switching times of Bankfrequenzüen against each other and / or a duty cycle of the generated high-frequency alternating currents.
  • an improved comfort can be achieved, since in a phase-delayed control mode the heating-frequency units are operated at the same frequency, and thus audible acoustic phenomena based on the difference between the frequencies of the heating-frequency units can be avoided.
  • 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 induction heating device has at least one third induction heating unit, which is assigned to the first heating frequency unit, at least one fourth induction heating unit, which is assigned to the second heating frequency unit, and a further resonance unit, which is assigned to the third and fourth induction heating units.
  • a comfort increase can be achieved.
  • the induction heating device in each case has a switching unit which is arranged between the heating frequency unit and the at least two associated induction heating units and is provided to produce a direct connection between the heating frequency unit and one of the associated induction heating units.
  • a "switching unit" is to be understood in particular as a unit having at least one switching element.
  • the switching unit has at least one input, in particular exactly one input, and at least a first and a second output.
  • the switching unit has at least two switching states. In a first switching state, the input is directly connected to the first output, and in a second switching state, the input is directly connected to the second output. In particular, the input is simultaneously directly connected to a maximum of one output.
  • the input to the heating frequency unit is directly connected and the outputs are each directly connected to different heating frequency units. In particular, good flexibility can be achieved.
  • the induction heating device has at least one control unit which is provided to operate one of the induction heating units alternately in at least two different operating modes in at least one operating mode.
  • an induction heating unit “alternately” in different operating modes, it should be understood, in particular, that at least one operating section of another operating mode lies between two operating sections of the same operating mode.
  • directly successive operating sections of different operating modes with a maximum of 2 s, in particular a maximum of 0.5 s, advantageously a maximum of 100 ms, preferably a maximum of 10 ms spaced.
  • starting points of operating sections of the same operating mode with a maximum of 10 s, in particular a maximum of 7 s, advantageously at most 5 s, and preferably at most 3 s spaced.
  • a distance between two starting points of directly successive operating sections of any operating mode is a multiple of 50 ms or a multiple of 100 ms.
  • a "operating section" of an operating mode is to be understood in particular as meaning a period in which the induction heating unit is continuously operated with a high-frequency alternating current having in particular at least a 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.
  • a “mode” should be understood in particular a standard mode, a phase-delayed control mode or a mode with alternating reflux.
  • a “standard mode” is to be understood in particular a mode of an induction heating unit in which the induction heating unit is traversed by high-frequency alternating current and differs from an induction heating unit which is directly connected to a further induction heating unit which is simultaneously powered by high-frequency alternating current is flowed through.
  • An "alternating reflux mode" of an induction heating unit is to be understood in particular as a mode in which the heating frequency unit assigned to the induction heating unit is connected via the induction heating unit and another induction heating unit to another heating frequency unit and in which the heating frequency units are operated alternately, ie in particular within 2 s at least once each, in particular at least 2 times, advantageously at least 4 times, and preferably at least 10 times, are active.
  • the heating frequency units are operated alternately, ie in particular within 2 s at least once each, in particular at least 2 times, advantageously at least 4 times, and preferably at least 10 times, are active.
  • at most one of the induction heating units is active.
  • a high degree of flexibility can be achieved.
  • 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 Schufrequenzmaschinen 30, 32, which are intended to be operated on the single phase 16 and the Induction heating units 20, 22, 24, 26 to supply ( 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 heating frequency units 30, 32 are arranged between the external contacts 40, 42 and convert the pulsating DC voltage into high-frequency alternating current.
  • the Schufrequenzillon 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 each directly connected to a switching unit 64, 65, each having a, formed by a relay, switching element.
  • the switching elements are designed as a two-pole changeover switch and provided to connect one of the induction heating units 20, 22, and 24, 26 with the heating frequency unit 30 and 32 directly.
  • the switching units 64, 65 each have one input and two outputs and two switching states. In a first switching state, the input is directly connected to the first output and in a second switching state, the input and the second output are directly connected (In the illustration, the input is on the left and the first output on the top right).
  • An input of the switching unit 64, 65 is in each case directly connected to the voltage tap 60, 62 of the heating frequency unit 30, 32.
  • the induction heating units 20, 22 are directly connected to outputs of the switching unit 64 and thus associated with the heating frequency unit 30.
  • the induction heating units 24, 26 are directly connected to outputs of the switching unit 65 and thus associated with the heating frequency unit 32.
  • the induction heating units 20, 24 and 22, 26 each have a common contact 78, 79, which is in each case directly connected to a resonance unit 80, 81, formed by two resonance capacitances 82, 84 and 83, 85 formed from individual capacitors is.
  • 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 identical capacities.
  • the induction heating device 12 thus has first and second heating frequency units 30, 32, a first induction heating unit 20 associated with the first heating frequency unit 30, and a second induction heating unit 24 associated with the second heating frequency unit 32, and both induction heating units 20, 24 are the resonance unit 80 assigned.
  • the induction heating apparatus has a third induction heating unit 22 associated with the first heating frequency unit 30, a fourth induction heating unit 26 associated with the second heating frequency unit 32, and another resonance unit 81 associated with the third and fourth induction heating units 22, 26.
  • a switching unit 64, 65 which is arranged between the heating frequency unit 30, 32 and the respective two associated induction heating units 20, 22 and 24, 26 and is provided, in each case a direct connection between the heating frequency unit 30, 32 and one of the associated induction heating units 20, 22 and 24, 26 produce.
  • the control unit 34 is provided to operate one of the induction heating units 20, 22, 24, 26 alternately in at least two different operating modes in at least one operating mode. In some modes of operation in which a single induction heating unit 20, 22, 24, 26 is operated, it will operate in standard mode or at low power sections in standard mode, ie alternately with active and inactive Bankfrequenzaise 30, 32, operated.
  • the switching units 64, 65 are connected in opposition, so that the heating frequency units 30, 32 are not connected via two of the induction heating units 20, 22, 24, 26. The switching states of the switching units 64, 65 remain constant.
  • two of the induction heating units 20, 22, 24, 26 are operated.
  • the induction heating units 20 and 22 or 24 and 26 are operated, they are operated alternately in the standard mode.
  • the induction heating units 20 and 24 or 22 and 26 are operated, they are operated in a phase-delayed drive mode. If the induction heating units 20 and 26 or 22 and 24 are operated, they are each operated in the standard mode or in standard sections mode, wherein the switching states of the switching units change in time with the sections.
  • the two of the three induction heating units 20, 22, 24, 26 sharing no resonance unit are operated in standard mode and either the two in a second operating section of the three induction heating units 20 and 24 or 22 and 26, which share one resonance unit in common, operated in the phase-delayed control mode or the remaining of the three induction heating units 20, 22, 24, 26 in the standard mode.
  • at least one of the switching units 64, 65 regularly changes their switching state.
  • the induction heating units 20 and 24 or 22 and 26 are operated in sections in the phase-delayed control mode or the induction heating units 20 and 26 or 22 and 24 are operated in sections in standard mode. Both of the switching units 64, 65 regularly change their switching state.
  • Operating modes are starting points of successive operating sections of different Operating modes, depending on the services requested for the induction heating units 20, 22, 24, 26 spaced from each other with 100 ms to 1.9 s.
  • Periods between operating sections of different operating modes and / or different induction heating units 20, 22, 24, 26, in which neither the first nor the second heating frequency unit 30, 32 is active, are at least 7 ms long to safely switch the switching states of the switching units 64, 65 to ensure.
  • the operating sections form a cyclic sequence with a period of 2 s.
  • the control unit 34 is designed to determine, in dependence on the powers required for the induction heating units 20, 22, 24, 26, lengths of operating sections, frequencies of the heating-frequency units 30, 32 in operating sections and an operating mode.
  • the mode with alternating backflow can be used.
  • the switching units 64, 65 are replaced by switching units, each having an input, two outputs, two two-pole power switch and thus four switching states. In a first switching state, the input is connected directly to the first output, in a second switching state, the input is connected directly to the second output, in a third switching state, the input is directly connected to both outputs and in a fourth switching state, the input is none the outputs directly connected.
  • each of the induction heating units 20, 22, 24, 26 may be operated alone in the standard mode or any number of induction heating units 20, 22, 24, 26 alternately in standard section mode and / or any number of induction heating units 20, 22, 24 , 26 pairs in sections in phase-delayed control mode and / or in alternate reverse flow mode and / or in a combination of operating modes.
  • components can be saved and furthermore it can be achieved that in every possible operating mode audible, acoustic phenomena which are based on the difference between the frequencies of the heating-frequency units are avoided.

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

Claims (5)

  1. Dispositif de chauffage à induction avec au moins une première et une deuxième en unité de fréquence de chauffe (30, 32), avec au moins une première unité de chauffe à induction (20, 22, 24, 26) affectée à la première unité de fréquence de chauffe (30, 32), avec au moins une deuxième unité de chauffe à induction (20, 22, 24, 26), affectée à la deuxième unité de fréquence de chauffe (30, 32), et avec une unité de résonance (80, 81) à laquelle les deux unités de chauffe à induction (20, 22, 24, 26) sont affectées, caractérisé par un module de puissance (18) exploité par une seule phase (16) d'un raccordement domestique triphasé, lequel module est prévu afin d'alimenter les unités de chauffe à induction (20, 22, 24, 26) en courant alternatif à haute fréquence d'une fréquence de commutation entre 20 kHz et 100 kHz, dans lequel le module de puissance (18) présente les deux unités de fréquence de chauffe (30, 32), dans lequel les unités de fréquence de chauffe (30, 32) sont prévues afin d'être exploitées via une seule phase (16).
  2. Dispositif de chauffage à induction selon la revendication 1, caractérisé par au moins une troisième unité de chauffe à induction (20, 22, 24, 26) affectée à la première unité de fréquence de chauffe (30, 32), au moins une quatrième unité de chauffe à induction (20, 22, 24, 26) affectée à la deuxième unité de fréquence de chauffe (30, 32) et une unité de résonance supplémentaire (80, 81) à laquelle la troisième et la quatrième unité de chauffe à induction (20, 22, 24, 26) sont affectées.
  3. Dispositif de chauffage à induction selon la revendication 2, caractérisé par une unité de commutation (64, 65) disposée entre l'unité de fréquence de chauffe (30, 32) et au moins deux unités de chauffe à induction (20, 22, 24, 26) et prévue afin d'établir une liaison directe respective entre l'unité de fréquence de chauffe (30, 32) et l'une des unités de chauffe à induction affectées (20, 22, 24, 26).
  4. Dispositif de chauffage à induction selon l'une des revendications précédentes, caractérisé par au moins une unité de commande (34) prévue afin d'exploiter dans au moins un mode de fonctionnement une des unités de chauffe à induction (20, 22, 24, 26) alternativement selon au moins deux types de fonctionnement différents.
  5. Appareil ménager avec un dispositif de chauffe à induction (12) selon l'une des revendications précédentes.
EP12160670.1A 2011-03-30 2012-03-22 Dispositif de chauffage à induction Active EP2506670B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201130496 2011-03-30

Publications (3)

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EP2506670A2 EP2506670A2 (fr) 2012-10-03
EP2506670A3 EP2506670A3 (fr) 2012-11-14
EP2506670B1 true EP2506670B1 (fr) 2017-10-18

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EP12160670.1A Active EP2506670B1 (fr) 2011-03-30 2012-03-22 Dispositif de chauffage à induction

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ES (1) ES2645734T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3582587B1 (fr) * 2018-06-16 2022-09-28 Electrolux Appliances Aktiebolag Procédé de commande de deux zones de cuisson d'une table de cuisson à induction

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Publication number Priority date Publication date Assignee Title
ES2330496B1 (es) * 2007-10-31 2010-09-08 Bsh Electrodomesticos España, S.A. Dispositivo de coccion.
ES2388303B1 (es) * 2010-03-03 2013-08-23 BSH Electrodomésticos España S.A. Encimera de cocción con al menos una zona de cocción, y procedimiento para accionar una encimera de cocción.
ES2386456B1 (es) * 2010-06-28 2013-07-19 BSH Electrodomésticos España S.A. Dispositivo de encimera de coccion

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* Cited by examiner, † Cited by third party
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Publication number Publication date
ES2645734T3 (es) 2017-12-07
EP2506670A3 (fr) 2012-11-14
EP2506670A2 (fr) 2012-10-03

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