EP2214454B1 - Champ de cuisson à induction doté de plusieurs inducteurs - Google Patents

Champ de cuisson à induction doté de plusieurs inducteurs Download PDF

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Publication number
EP2214454B1
EP2214454B1 EP10151166A EP10151166A EP2214454B1 EP 2214454 B1 EP2214454 B1 EP 2214454B1 EP 10151166 A EP10151166 A EP 10151166A EP 10151166 A EP10151166 A EP 10151166A EP 2214454 B1 EP2214454 B1 EP 2214454B1
Authority
EP
European Patent Office
Prior art keywords
inductor
inductors
switching element
control unit
inverter
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.)
Active
Application number
EP10151166A
Other languages
German (de)
English (en)
Other versions
EP2214454A1 (fr
Inventor
Claudio Carretero Chamarro
Ignacio Garde Aranda
Sergio Llorente Gil
Ignacio Millan Serrano
Daniel Moros Sanz
Daniel Palacios Tomas
Ramon Peinado Adiego
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 Bosch und Siemens Hausgeraete GmbH
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Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2214454A1 publication Critical patent/EP2214454A1/fr
Application granted granted Critical
Publication of EP2214454B1 publication Critical patent/EP2214454B1/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
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • 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
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate

Definitions

  • the invention relates to an induction hob with a plurality of inductors according to the preamble of claim 1 and a method for operating an induction hob according to the preamble of claim 9.
  • an induction hob with multiple inductors and a control unit for activating and deactivating the inductors is known.
  • a half-bridge inverter generates a heating current for driving the inductors, and includes two semiconductor switching elements that can connect and disconnect a connection between one of the inductors and a positive pole of a rectifier or ground potential.
  • the two semiconductor switching elements are alternately opened and closed by the control unit with the frequency of the heating current.
  • One of the semiconductor switching elements can therefore be used for grounding at least one of the inductors, but this only happens during the active phases of the inductor in order to generate the alternating voltage.
  • the semiconductor switches consist of a transistor with a parallel freewheeling diode.
  • the input lines of the half-bridge inverters and the output lines of the rectifier are connected via a damping capacitor.
  • a damping capacitor For example, when an alternating magnetic field is induced in an inactive inductor by the operation of an adjacent inductor, a current may be induced to flow through the freewheeling diode into the bus line of the inverter connected to the positive pole of the rectifier. A discharge of the charge is prevented by the freewheeling diode, so that the charge can accumulate in the damping capacitor. This can lead to uncontrolled discharge upon reactivation of the inductor. This uncontrolled discharge can eventually lead to damage in electronic components of the induction hob.
  • the object of the invention is, in particular, to provide an induction hob, in which uncontrolled charge accumulations in the bus line can be avoided.
  • the invention is based in particular on an induction hob with a plurality of inductors, a control unit for activating and deactivating the inductors and a switching element for grounding at least one of the inductors.
  • control unit close the switching element and ground the inductor when the inductor is deactivated.
  • charge accumulation in the bus line and uncontrolled discharges can be avoided, which ultimately damage of electronic components are unlikely and the life of the induction hob can be increased.
  • a separate switching element can be avoided if the switching element is a semiconductor switch of an inverter connected to the inductor, which may be in particular a transistor with insulated gate electrode.
  • the induction hob comprises a plurality of power electronics modules, each with at least one rectifier and at least one inverter, since then individual supply lines can be inactive, although adjacent inductors are in operation.
  • the switching element comprises a transistor and a diode arranged parallel to the transistor.
  • the body diode can act in this sense.
  • An inexpensive switching element can be realized by an IGBT transistor in which the transistor has an insulated gate electrode.
  • a further aspect of the invention relates to a method for operating an induction hob with a plurality of inductors and a control unit for activating and deactivating the inductors and a switching element for grounding at least one of the inductors.
  • the switching element is closed and the inductor is grounded when the inductor is deactivated.
  • the inductor is grounded only if at least one inductor adjacent to the grounded inductor is active.
  • FIG. 1 shows an induction hob with a plurality of inductors 10 and a control unit 18.
  • the inductors 10 are distributed in a regular two-dimensional grid over the entire surface of the induction hob.
  • the inductors 10 are covered by a cover plate 12 made of glass or glass ceramic, on which cookware elements 14, 16 as cooking pots or pans can be placed.
  • the control unit 18 In order to detect the cookware elements 14, 16, the control unit 18 generates low-voltage measuring currents which flow through the inductors 10 or the oscillators comprising the inductors 10.
  • a cookware element 14, 16 completely or partially covers one of the inductors 10, this affects the inductance of this inductor 10.
  • a degree of change in the inductance is related to the degree of coverage.
  • the eddy current losses in the bottom of the cookware elements 14, 16 also influence the damping of the resonant circuit.
  • the control unit 18 can therefore from the vibration characteristics of the resonant circuit, the presence and the degree of coverage of the respective inductor 10 through the cookware element Determine 14, 16 and also draw conclusions on the material properties of the cooking utensil 14, 16 and on the material properties of the bottom.
  • control unit 18 After detection of a cookware element 14, 16, the control unit 18 sums those inducers 10 which are covered with at least a certain degree of coverage from the bottom of the cookware element 14, 16 to a heating zone adapted in size, shape and position to the cookware element 14, 16 20, 22 together.
  • the induction hob comprises a user interface 26 with a plurality of control elements 28 and a display 24.
  • the heating zone 20, 22 determined in the manner described above is shown as a pictogram, depending on the shape of the cooking utensil 14, 16, for example as a circle, oval or rectangle on the display 24, so that the user has an overview of the active heating zones 20, 22.
  • the user can finally set a heating power for each of the heating zones 20, 22.
  • the user sets a performance level that can assume, for example, integer and half-integer values between 0 and 9.
  • the control unit 18 converts the power stage into a heating power and operates the inductors 10 so that in the inductors 10 of the respective heating zone 20, 22 a total of the desired heating power is generated.
  • control unit 18 connects the inductors 10 of the heating zone 20, 22 with one or more inverters 32 of two power electronics modules 44, 46 of the induction hob by actuating a switching arrangement 30.
  • the inverters 32 comprise unipolar semiconductor switches 34, which in the exemplary embodiment are formed as transistors 64, 66 with insulated-gate insulated-gate electrodes (IGBTs) (see also FIGS Fig. 2 ).
  • the semiconductor switches 34 arranged in a half-bridge configuration are each connected via a bus line 48, 50 (FIG. Fig. 2 ) is connected to a pole of a rectifier 36 of one of the power electronics assemblies 44, 46, which communicates via a filter circuit 38 with a phase 40, 42 of a household power network.
  • the two power electronics modules 44, 46 are fed by two phases 40, 42 of the three-phase network.
  • a damping capacitor 56, 58 is arranged in each case.
  • the heating current generated by the inverters 32 having a frequency which is approximately in the range of between 75 kHz and 100 kHz generates, in operation in the inductors 10, a rapidly changing magnetic field which causes eddy currents in the ferromagnetic bottom of the cookware element 14, 16.
  • the eddy currents eventually generate heat in this soil.
  • the frequency of the heating current is above a resonant frequency of the inductor 10, a resonant capacitor, not shown here, and the bottom of the cookware element 14, 16 comprehensive overall system. With increasing frequency, fewer and fewer white areas in the ferromagnetic bottom of the cookware element 14, 16 can follow the alternating magnetic field, so that the power dissipation and thus the heating power decreases.
  • the heat output coupled by the inductors 10 into the bottom of the cookware element 14, 16 can be adjusted by the control unit 18. Furthermore, the control unit 18, the inductors 10 on and off periodically to achieve a certain desired heating power in the time average.
  • FIG. 2 2 shows a circuit diagram for the connection of two rectifiers 36a, 36b, each with two inverters 32a, 32a ', 32b, 32b' and inductors 10a, 10b, wherein the switching arrangement 30 (FIG. Fig. 1 ) between the inverters 32a, 32a ', 32b, 32b' and the inductors 10a, 10b is not shown for reasons of clarity.
  • the switching arrangement 30 FIG. Fig. 1
  • groups of inductors 10a, 10b are respectively associated with one of the rectifiers 36a, 36b and are typically powered by this rectifier 36a, 36b.
  • the inductors 10a, 10b of both groups are distributed over the entire surface of the hob and arranged alternately, so that each inductor 10a, 10b in its immediate vicinity typically has a plurality of inductors 10a, 10b from the other group, respectively, due to the nested structure in FIG. 2 is shown. If one of the inductors 10b is operated or charged with the heating current, this induces Inductor 10b therefore always an alternating field in the adjacent inductors 10a of the other group.
  • FIG. 3 Figure 3 shows the bus line voltage in an inactive inductor 10a, 10b in an arrangement similar to the prior art when one of the inductors 10a is inactive and an adjacent inductor 10b is active.
  • the lower bold curve shows the output voltage of the active rectifier 36b and the upper dashed curve shows the voltage in the bus line 48 of the inactive rectifier 36a. It can be seen that charge accumulates in the bus line 48.
  • FIGS. 4a and 4b shown schematically.
  • an inactive inductor 10a with an inverter 32a, the current carrying lines being shown in bold and the directions of the currents being illustrated by arrows.
  • FIG. 4a shows a phase in which a positive voltage is induced in the inductor 10a. The induced current may flow through the upper diode 60 of the inverter 32a into the bus line 48 and accumulate in the snubber capacitor 56.
  • FIG. 4a shows a phase in which a negative voltage is induced in the inductor 10a, 10b.
  • the charge accumulated in the bus line 48 can not drain away, so that a cumulative charge accumulates in the bus line 48 or in the snubber capacitor 56 connected to this bus line.
  • FIG. 5 shows a schematic representation of the grounding of an inactive inductor 10a.
  • the upper inductor 10b is operated by the first rectifier 36b and generates a magnetic field that is a voltage in the in FIG. 5 Inductor 10a shown below is induced.
  • the insulated gate transistors 64 of the inverter 32a associated with the lower inductor 10a would both be disabled in the inactive state of the inverter so that no current could flow through the transistors 64.
  • the control unit close the switching element 68 by switching the lower transistor 64 of the lower inverter 32a to ON, thereby grounding the inductor 10a, although the lower inductor 10a is deactivated.
  • the inductor 10a then forms a closed resonant circuit with the capacitor 72 connected in series with the inductor 10a, and the voltage induced in the inductor 10a can easily drain off. Since the diode 60 in the upper switching element 70 of the inverter 32a has a greater intrinsic resistance than the on-pass transistor 64 of the lower switching element 68, the current can not flow into the bus line 48.
  • FIG. 6 shows the bus line voltage in an inactive inductor 10a, 10b in an induction hob according to the invention.
  • the comparison to FIG. 3 shows that the voltage in the bus line 48 does not rise above the voltage generated by the rectifier, so that uncontrolled discharges of the bus line 48 and the snubber capacitor 56 can be avoided.
  • the control unit 18 is a universally programmable arithmetic unit into which a method for operating an induction cooktop with a plurality of inductors 10a, 10b is implemented.
  • the control unit 18 activates and deactivates inductors 10a, 10b of the induction hob and actuates by control signals by means of control lines (not shown here) various switching elements, in particular switching elements of the switching arrangement 30 and the inverters 32.

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

Claims (10)

  1. Champ de cuisson à induction doté de plusieurs inducteurs (10, 10a, 10b) et d'une unité de commande (18) destinée à activer et désactiver les inducteurs (10, 10a, 10b) et d'un élément de commutation (68) destiné à mettre à la terre au moins un des inducteurs (10, 10a, 10b), caractérisé en ce que l'unité de commande (18) ferme l'élément de commutation (68) et met à la terre l'inducteur (10, 10a, 10b) lorsque l'inducteur (10, 10a, 10b) est désactivé.
  2. Champ de cuisson à induction selon la revendication 1, caractérisé en ce que l'élément de commutation (68) est un commutateur à semi-conducteur d'un onduleur (32, 32a, 32b) connecté à l'inducteur (10, 10a, 10b).
  3. Champ de cuisson à induction selon l'une quelconque des revendications précédentes, caractérisé en ce que les inducteurs (10, 10a, 10b) sont de construction identique et sont disposés dans une trame bidimensionnelle.
  4. Champ de cuisson à induction selon l'une quelconque des revendications précédentes, caractérisé par plusieurs sous-ensembles d'électronique de puissance (44, 46) comprenant respectivement au moins un redresseur (36, 36a, 36b) et au moins un onduleur (32, 32a, 32b).
  5. Champ de cuisson à induction selon l'une quelconque des revendications précédentes, caractérisé en ce que l'unité de commande (18) ferme l'élément de commutation (68) et met à la terre l'inducteur (10, 10a, 10b) seulement lorsqu'un inducteur (10, 10a, 10b) voisin à l'inducteur (10, 10a, 10b) mis à la terre est activé.
  6. Champ de cuisson à induction selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins un inducteur (10, 10a, 10b) voisin à l'inducteur (10, 10a, 10b) mis à la terre est attribué à un autre redresseur et à un autre onduleur (32, 32a, 32b) que l'inducteur mis à la terre (10, 10a, 10b).
  7. Champ de cuisson à induction selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de commutation (68) comprend un transistor (64) et une diode (60) disposée parallèlement au transistor (64).
  8. Champ de cuisson à induction selon la revendication 6, caractérisé en ce que le transistor (64, 68) a une grille isolée.
  9. Procédé de fonctionnement d'un champ de cuisson à induction doté de plusieurs inducteurs (10, 10a, 10b) et d'une unité de commande (18) destinée à activer et désactiver les inducteurs (10, 10a, 10b) et d'un élément de commutation (68) destiné à mettre à la terre au moins un des inducteurs (10, 10a, 10b), caractérisé en ce que l'élément de commutation (68) est fermé et l'inducteur (10, 10a, 10b) est mis à la terre lorsque l'inducteur (10, 10a, 10b) est désactivé.
  10. Procédé selon la revendication 9, caractérisé en ce que l'inducteur (10, 10a, 10b) est mis à la terre seulement lorsqu'au moins un inducteur (10, 10a, 10b) voisin à l'inducteur mis à la terre (10, 10a, 10b) est activé.
EP10151166A 2009-01-28 2010-01-20 Champ de cuisson à induction doté de plusieurs inducteurs Active EP2214454B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES200900349A ES2358819B1 (es) 2009-01-28 2009-01-28 Campo de cocción por inducción con varios inductores.

Publications (2)

Publication Number Publication Date
EP2214454A1 EP2214454A1 (fr) 2010-08-04
EP2214454B1 true EP2214454B1 (fr) 2011-10-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP10151166A Active EP2214454B1 (fr) 2009-01-28 2010-01-20 Champ de cuisson à induction doté de plusieurs inducteurs

Country Status (3)

Country Link
EP (1) EP2214454B1 (fr)
AT (1) ATE527858T1 (fr)
ES (2) ES2358819B1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2966691B1 (fr) * 2010-10-21 2016-12-30 Fagorbrandt Sas Procede de controle de signaux de commande periodiques, notamment pour une table de cuisson a induction.
ES2432235B1 (es) * 2012-05-30 2014-11-04 Bsh Electrodomésticos España, S.A. Dispositivo de calentamiento por inducción

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3712242A1 (de) * 1987-04-10 1988-10-27 Thomson Brandt Gmbh Schaltung zur stromversorgung einer induktiven kochstelle
DE102005038525A1 (de) * 2005-08-02 2007-03-08 E.G.O. Elektro-Gerätebau GmbH Induktionskocheinrichtung mit einstellbarer Heizleistung
ES2310089B1 (es) * 2006-05-18 2009-08-27 Bsh Electrodomesticos España, S.A. Unidad de placa de cocina.
DE602007003672D1 (de) 2007-01-23 2010-01-21 Teka Ind Sa Verfahren zur Regelung eines Induktionskochfeldes und zur Ausführung dieses Verfahrens adaptiertes Induktionskochfeld

Also Published As

Publication number Publication date
ES2374872T3 (es) 2012-02-22
ES2358819B1 (es) 2012-04-02
ATE527858T1 (de) 2011-10-15
ES2358819A1 (es) 2011-05-16
EP2214454A1 (fr) 2010-08-04

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