EP2497332B1 - Cook top comprising at least two heating inductors - Google Patents

Cook top comprising at least two heating inductors Download PDF

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Publication number
EP2497332B1
EP2497332B1 EP10778726.9A EP10778726A EP2497332B1 EP 2497332 B1 EP2497332 B1 EP 2497332B1 EP 10778726 A EP10778726 A EP 10778726A EP 2497332 B1 EP2497332 B1 EP 2497332B1
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EP
European Patent Office
Prior art keywords
heating
inverters
resonant circuit
inductors
power supply
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EP10778726.9A
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German (de)
French (fr)
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EP2497332A1 (en
Inventor
Daniel Anton Falcon
Carlos Bernal Ruiz
José Miguel BURDIO PINILLA
Jose Maria De La Cuerda Ortin
José-Ramon Garcia Jimenez
Pablo Jesus Hernandez Blasco
Sergio Llorente Gil
Oscar Lucia Gil
Arturo Mediano Heredia
Ignacio Millan Serrano
Fernando Monterde Aznar
Daniel Moros Sanz
Jose Joaquin Paricio Azcona
Diego Puyal Puente
José Ignacio Artigas Maestre
Luis Angel Barragan Perez
Claudio Carretero Chamarro
Oscar Jimenez Navascues
Denis Navarro Tabernero
Isidro Urriza Parroque
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2497332A1 publication Critical patent/EP2497332A1/en
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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
    • 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 hob with at least two heating inductors according to the preamble of claim 1 and a method for operating such a hob according to the preamble of claim 9.
  • the document WO 2009/056452 A1 discloses a cooktop with a heating zone having a plurality of concentrically arranged heating inductors which can be selectively connected to a half-bridge changer by means of a relay switch.
  • the document US 4,390,769 discloses a cooktop with two series-connected heating inductors, one of which is equipped with a tuning capacitor in parallel.
  • the document EP 1868417 A1 discloses a cooktop with a heating inductor comprising three inductor coils, two of which are each connected in series with a third one.
  • the invention is in particular the object of providing a low-cost cooktop and a method for operating such a cooktop.
  • the invention is based on a hob with at least two heating inductors, which are each connected to at least one resonant circuit capacitor to a resonant circuit.
  • At least one common resonant circuit capacitor is connected to both heating inductors.
  • the number of resonant circuit capacitors can be reduced, and a novel control strategy for controlling the cooktop can be implemented, which avoids time-division multiplexing methods for independently setting the heating powers of the different heating inductors.
  • hum through interference between independent oscillators and problems with flicker can be avoided.
  • a resonant circuit capacitor is a capacitor connected to a heating inductor, which capacitor is arranged in a series resonant circuit.
  • the connection between the resonant circuit capacitor and the heating inductor may be a hard-wired connection.
  • the series resonant circuit is supplied by an inverter with high-frequency heating current.
  • the frequency of the heating current determines the heating power of the heating inductor, which generates high frequency alternating magnetic fields.
  • the alternating magnetic fields generate eddy currents in the bottom of a cookware element placed on the hob, which heat up this bottom.
  • the hob comprises two inverters for supplying one of the heating inductors with a heating current.
  • each of the heating inductors should be connected to the output of a separate inverter.
  • control unit may be designed to operate the inverters with the same frequency in at least one operating mode, so that interference is avoided.
  • control unit can be designed to increase the ratio of the heating power of the two heating inductors to control an adjustment of a phase shift between the switching signals of the two inverters.
  • the two Schumanktoren are therefore supplied with heating currents of the same frequency, but which may have a different phase position.
  • the symmetry between the two each comprising a Walkerinduktor subsystems, which are coupled via the common resonant circuit capacitor is thereby broken, and there are heating currents with different amplitudes.
  • the ratio of these amplitudes and thus the ratio of the heating powers is therefore dependent on the selected phase shift, which can be set by the control unit according to the request of the operator.
  • the total heating power can thus be adjusted via the choice of the frequency of the heating current and the ratio of the heating power through the choice of the phase shift, so that overall the heating power of at least two Walkerinduktoren can be set independently of each other at least in a large range of values.
  • control unit can control the ratio of the heating powers by setting pulse lengths of the heating current pulses generated by the inverters.
  • a DC component in the heating current can be avoided in this case, if the pulse lengths of the two inverters are set to the same value and this value is selected at a given frequency depending on the desired ratio of the heating powers.
  • the heating powers can be set depending on the specifications of the user without complex calculations when the hob comprises a memory unit for storing an at least two-dimensional map.
  • the characteristic map stores the phase shift to be set and / or the pulse lengths as a function of the ratio of the heating powers to be controlled and the total heat output of the two heating inductors.
  • each of the two resonant circuit capacitor is connected to a pole of the power supply unit and the inverters each form a half-bridge circuit between the two poles, the electromagnetic emission properties of the hob can be improved.
  • the resonant frequency of the resonant circuit or of the overall system can be changed if the common oscillator capacitor is part of a common oscillator circuit capacitor arrangement with a variable total capacitance.
  • a common resonant circuit capacitor can be switched on or disconnected from the system.
  • the inventive concept is readily generalizable to hobs with three or more heating inductors connected in series with one or more common capacitors to a resonant circuit.
  • Another aspect of the invention relates to a method for operating a hob with at least two heating inductors, which are connected to at least one capacitor in series with a resonant circuit.
  • the hob further includes two inverters for generating heating currents for the heating inductors.
  • the common capacitor is connected to both Thompsoninduktoren and that a ratio of the heating power of the two Walkerinduktoren is controlled by adjusting a phase shift between the switching signals of the two inverters and / or by adjusting the pulse length of the heating currents for a given period.
  • Fig. 1 shows schematically the structure of an induction cooktop with two heating inductors 10a, 10b, which are each connected to the output of an inverter 12a, 12b.
  • the inverters 12a, 12b are supplied with direct current by a power supply unit.
  • the power supply unit includes a filter 14 and a rectifier 16.
  • the filter 14 smoothes the 50 Hz AC voltage obtained from a phase 18 of a household power network, which is converted by the rectifier 16 into a DC current.
  • a respective damping capacitor 20a, 20b is arranged, which acts as a low-pass filter and prevents feedback of the high-frequency heating currents generated by the inverters 12a, 12b in the household power grid.
  • the inverters 12a, 12b are arranged in a half-bridge circuit between the two poles of the rectified supply voltage.
  • the inverters 12a, 12b each consist of a pair of IGBTs or MOSFETs with an antiparallel freewheeling diode and are operated to generate a high-frequency heating current having a frequency of typically 20 to 100 kHz.
  • the control unit switches the two semiconductor switches of the inverters 12a, 12b alternately on and off.
  • the control unit 22 can determine both the period T of the switching on and off as well as the relative duration of the switching on and off phases and thus their pulse length Pa, Pb independently.
  • the outputs of the heating inductors 10a, 10b are brought together and connected to a common oscillating circuit capacitor arrangement 24, which comprises two resonant circuit capacitors 26a, 26b respectively connected to both heating inductors 10a, 10b.
  • the resonant circuit capacitors 26a, 26b are connected in series with both heating inductors 10a, 10b and, on the other hand, each connected to one pole of the power supply unit comprising the filter 14 and the rectifier 16.
  • the two resonant circuit capacitors 26a, 26b are equivalent to a common capacitor arranged in a connecting line 28, which would then have twice the capacitance and whose capacitance together with the inductance of one of the heating inductors 10a, 10b would determine the resonant frequency of the resonant circuit.
  • Fig. 1 is particularly simplified insofar as the cooktop can also comprise more than two inductors, which can either be connected in pairs to common resonant circuit capacitor arrangements 24 or can also be assigned in groups of three or more heating inductors to a common oscillator circuit capacitor arrangement 24.
  • Fig. 2 shows the switching signals, which transmits the control unit 22 via control lines, not shown here to the semiconductor switches of the inverters 12a, 12b.
  • Upper curve Q1 corresponds to the signal of the upper switch of the upper inverter 12a in FIG Fig. 1
  • the second curve Q2 shows the switching signal of the lower switch of the upper inverter 12a
  • the curves Q3 and Q4 show the switching signals of the two unipolar bidirectional semiconductor switches of the lower inverter 12b.
  • the control unit 22 turns on and off each of the switches with a period T in turn.
  • the period T and thus the frequency of the heating current generated by the inverters 12a, 12b is the same for both inverters 12a, 12b. This can not cause interference.
  • the control unit 22 can flexibly adjust the amplitudes of the heating currents flowing through the heating inductors 10a, 10b and thus determine the heating powers of the heating inductors 10a, 10b.
  • Fig. 3 schematically shows a two-dimensional map, which is stored in the memory unit 30 of the control unit 22 and is used by the control unit 22 for determining the ratio of the heating powers.
  • the map indicates the ratio of the heating power depending on the frequency of the heating current and the delay d, the latter being indicated as a fraction of the period T.
  • Illustrated lines are lines with constant heating power ratio.
  • FIG. 12 shows another two-dimensional map from the memory unit 30 indicating the total heating power of the heating inductors 10a, 10b as a function of the frequency and the proportion d / T of the delay d at the period T.
  • FIG. In Fig. 4 Also shown are lines with constant total heat output.
  • the dead times t1 to t4 correspond to the times in which the corresponding semiconductor switch is open, but the current flows in the freewheeling direction of the freewheeling diode arranged in antiparallel to this semiconductor switch.
  • the semiconductor switches of the inverters 12a, 12b are usually opened during this phase in order to avoid switch-on losses. However, this is only possible in a certain parameter range, which in the FIGS. 3 and 4 outside the hatched area B shown hatched. Within this prohibited area B hard switching operations occur in which the current is interrupted abruptly and lead to switching losses.
  • the control unit 22 first calculates the desired total heating power for a given desired heat output of the heating inductors 10a, 10b and assigns this to one of the in Fig. 4 shown Isolinien with constant total heat output too. Subsequently, the control unit 22 determines the ratio of the two desired heating powers of the heating inductors 10a, 10b and determines a corresponding isoline in the map in FIG Fig. 3 , The intersection of these two isolines is determined and its coordinates are determined so as to determine the frequency to be controlled by the control unit 22 and the delay d. Of course, this process can be carried out beforehand for all pairs of desired heat outputs, so that the frequency and the delay d can be determined directly from a respective map.
  • the pulse lengths Pa, Pb are varied so as to determine the appropriate delay d for a given pulse length Pa, Pb for suitable heating frequencies.
  • the memory unit 30 to maps for different ratios of pulse lengths Pa, Pb are stored.
  • Fig. 5 shows a further alternative embodiment of the invention with a switchable oscillator capacitor assembly 24, which comprises a total of four resonant circuit capacitors 26a, 26b, 26c, 26d.
  • the resonant circuit capacitors 26c, 26d can be switched on or off depending on the desired resonance frequency by means of a switch 32, whereby switching losses can be avoided and the forbidden region B can be shifted with high switching losses.
  • resonant circuit capacitor arrangements 24 with continuously variable capacitors or with more than two different possible values of the total capacitance are also conceivable.

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

Description

Die Erfindung betrifft ein Kochfeld mit wenigstens zwei Heizinduktoren nach dem Oberbegriff des Anspruchs 1 und ein Verfahren zum Betreiben eines solchen Kochfelds nach dem Oberbegriff des Anspruchs 9.The invention relates to a hob with at least two heating inductors according to the preamble of claim 1 and a method for operating such a hob according to the preamble of claim 9.

Aus der EP 0 986 287 A2 ist ein Kochfeld mit zwei Heizinduktoren bekannt, die jeweils mit einem separaten Schwingkreiskondensator in Reihe geschaltet sind. In herkömmlichen Kochfeldern wird in der Regel für jeden zu betreibenden Induktionsheizkörper ein unabhängiger Schwingkreis gebildet. Dadurch können die Frequenzen und/oder Amplituden der Heizströme für die betreffenden Induktionsheizkörper in einer einfachen Weise unabhängig voneinander gewählt werden, um die Heizleistungen unabhängig voneinander einzustellen.From the EP 0 986 287 A2 is a cooktop with two Heizinduktoren known, which are each connected in series with a separate resonant circuit capacitor. In conventional hobs, an independent resonant circuit is usually formed for each induction heater to be operated. Thereby, the frequencies and / or amplitudes of the heating currents for the respective induction heaters can be selected independently of each other in a simple manner to adjust the heating powers independently.

Um die einschlägigen Flicker-Normen zu erfüllen und um ein Interferenzbrummen zu vermeiden, werden jedoch in vielen Fällen benachbarte Heizinduktoren mit Heizströmen der gleichen Frequenz betrieben. Um dennoch unterschiedliche Heizleistungen zu ermöglichen, werden die Heizelemente teilweise in einem Zeit-Multiplex-Verfahren betrieben. In diesem Zeit-Multiplex-Verfahren können dann in unterschiedlichen, sich periodisch wiederholenden Zeitfenstern unterschiedliche Frequenzen gewählt werden. Dieses Verfahren ist jedoch aufwendig und kann durch Spannungssprünge beim Umschalten zwischen den Zeitfenstern zu Problemen mit Flicker führen.In order to meet the relevant flicker standards and to avoid interference hum, however, in many cases adjacent heating inductors are operated with heating currents of the same frequency. In order to nevertheless allow different heating powers, the heating elements are partially operated in a time-multiplex method. In this time-multiplex method different frequencies can then be selected in different, periodically repeating time windows. However, this method is complicated and can lead to problems with flicker due to voltage jumps when switching between the time windows.

Das Dokument WO 2009/056452 A1 offenbart ein Kochfeld mit einer Heizzone mit mehreren, konzentrisch angeordneten Heizinduktoren, die mit Hilfe eines Relaisschalters wahlweise mit einem Halbbrücken-Wechslerichter verbunden werden können. Das Dokument US 4,390,769 offenbart ein Kochfeld mit zwei in Reihe geschalteten Heizinduktoren, von denen einer mit einem parallel geschalteten Abstimmkondensator ausgestattet ist. Das Dokument EP 1868417 A1 offenbart ein Kochfeld mit einem Heizinduktor, der drei Induktorspulen umfasst, von denen zwei jeweils in Reihe mit einer dritten geschaltet sind.The document WO 2009/056452 A1 discloses a cooktop with a heating zone having a plurality of concentrically arranged heating inductors which can be selectively connected to a half-bridge changer by means of a relay switch. The document US 4,390,769 discloses a cooktop with two series-connected heating inductors, one of which is equipped with a tuning capacitor in parallel. The document EP 1868417 A1 discloses a cooktop with a heating inductor comprising three inductor coils, two of which are each connected in series with a third one.

Der Erfindung liegt insbesondere die Aufgabe zugrunde, ein kostengünstiges Kochfeld und ein Verfahren zum Betreiben eines solchen Kochfelds bereitzustellen.The invention is in particular the object of providing a low-cost cooktop and a method for operating such a cooktop.

Die Aufgabe wird insbesondere durch ein Kochfeld mit den Merkmalen des unabhängigen Anspruchs 1 und durch ein Verfahren mit den Merkmalen des unabhängigen Anspruchs 9 gelöst. Weitere vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.The object is achieved in particular by a hob with the features of independent claim 1 and by a method having the features of independent claim 9. Further advantageous embodiments and modifications of the invention will become apparent from the dependent claims.

Die Erfindung geht aus von einem Kochfeld mit wenigstens zwei Heizinduktoren, die jeweils mit zumindest einem Schwingkreiskondensator zu einem Schwingkreis verbunden sind.The invention is based on a hob with at least two heating inductors, which are each connected to at least one resonant circuit capacitor to a resonant circuit.

Es wird insbesondere vorgeschlagen, dass wenigstens ein gemeinsamer Schwingkreiskondensator mit beiden Heizinduktoren verbunden ist. Dadurch kann die Anzahl der Schwingkreiskondensatoren reduziert werden und es kann eine neuartige Regelungsstrategie zum Steuern des Kochfelds implementiert werden, die Zeitmultiplexverfahren zum unabhängigen Einstellen der Heizleistungen der verschiedenen Heizinduktoren vermeidet. Schließlich können ein Brummen durch Interferenzen zwischen unabhängigen Schwingkreisen und Probleme mit Flicker vermieden werden.In particular, it is proposed that at least one common resonant circuit capacitor is connected to both heating inductors. Thereby, the number of resonant circuit capacitors can be reduced, and a novel control strategy for controlling the cooktop can be implemented, which avoids time-division multiplexing methods for independently setting the heating powers of the different heating inductors. Finally, hum through interference between independent oscillators and problems with flicker can be avoided.

Als Schwingkreiskondensator soll in diesem Zusammenhang ein mit einem Heizinduktor geschalteter Kondensator bezeichnet werden, der in einem Reihenschwingkreis angeordnet ist. Die Verbindung zwischen dem Schwingkreiskondensator und dem Heizinduktor kann insbesondere eine fest verdrahtete Verbindung sein. Der Reihenschwingkreis wird von einem Wechselrichter mit hochfrequentem Heizstrom versorgt. Die Frequenz des Heizstroms bestimmt die Heizleistung des Heizinduktors, der hochfrequente Wechselmagnetfelder erzeugt. Die Wechselmagnetfelder erzeugen Wirbelströme im Boden eines auf das Kochfeld aufgestellten Kochgeschirrelements, die diesen Boden aufheizen.In this context, a resonant circuit capacitor is a capacitor connected to a heating inductor, which capacitor is arranged in a series resonant circuit. In particular, the connection between the resonant circuit capacitor and the heating inductor may be a hard-wired connection. The series resonant circuit is supplied by an inverter with high-frequency heating current. The frequency of the heating current determines the heating power of the heating inductor, which generates high frequency alternating magnetic fields. The alternating magnetic fields generate eddy currents in the bottom of a cookware element placed on the hob, which heat up this bottom.

Durch die Verwendung des gemeinsamen Schwingkreiskondensators wird ein aus den Heizinduktoren und dem Schwingkreiskondensator gekoppeltes System gebildet, das eine neuartige Kontrollstrategie erforderlich macht, um unterschiedliche Heizleistungen einstellen zu können. Diese neuen Steuerungsstrategien können insbesondere dann einfach implementiert werden, wenn das Kochfeld zwei Wechselrichter zum Versorgen jeweils eines der Heizinduktoren mit einem Heizstrom umfasst. Insbesondere soll jeder der Heizinduktoren an den Ausgang eines separaten Wechselrichters angeschlossen sein.By using the common resonant circuit capacitor, a coupled from the heating inductors and the resonant circuit capacitor system is formed, which makes a novel control strategy required to adjust different heat outputs can. These new control strategies can be implemented in particular simply if the hob comprises two inverters for supplying one of the heating inductors with a heating current. In particular, each of the heating inductors should be connected to the output of a separate inverter.

Ferner wird vorgeschlagen, das Kochfeld mit einer Steuereinheit auszustatten, die das neuartige Steuerungsverfahren ausführen kann. Dazu kann die Steuereinheit dazu ausgelegt sein, in zumindest einem Betriebsmodus die Wechselrichter mit der gleichen Frequenz zu betreiben, so dass Interferenzen vermieden werden. Ferner kann die Steuereinheit dazu ausgelegt sein, das Verhältnis der Heizleistung der beiden Heizinduktoren durch eine Einstellung einer Phasenverschiebung zwischen den Schaltsignalen der beiden Wechselrichter zu steuern.It is also proposed to equip the hob with a control unit that can perform the novel control method. For this purpose, the control unit may be designed to operate the inverters with the same frequency in at least one operating mode, so that interference is avoided. Furthermore, the control unit can be designed to increase the ratio of the heating power of the two heating inductors to control an adjustment of a phase shift between the switching signals of the two inverters.

Die beiden Heizinduktoren werden demnach mit Heizströmen gleicher Frequenz versorgt, die jedoch eine unterschiedliche Phasenlage haben können. Die Symmetrie zwischen den beiden jeweils einen Heizinduktor umfassenden Teilsystemen, die über den gemeinsamen Schwingkreiskondensator gekoppelt sind, wird dadurch gebrochen, und es stellen sich Heizströme mit unterschiedlichen Amplituden ein. Das Verhältnis dieser Amplituden und damit das Verhältnis der Heizleistungen ist daher abhängig von der gewählten Phasenverschiebung, die von der Steuereinheit nach dem Wunsch des Bedieners eingestellt werden kann. Die Gesamtheizleistung kann damit über die Wahl der Frequenz des Heizstroms und das Verhältnis der Heizleistungen über die Wahl der Phasenverschiebung eingestellt werden, so dass insgesamt die Heizleistung der wenigstens zwei Heizinduktoren zumindest in einem großen Wertebereich unabhängig voneinander eingestellt werden kann.The two Heizinduktoren are therefore supplied with heating currents of the same frequency, but which may have a different phase position. The symmetry between the two each comprising a Heizinduktor subsystems, which are coupled via the common resonant circuit capacitor is thereby broken, and there are heating currents with different amplitudes. The ratio of these amplitudes and thus the ratio of the heating powers is therefore dependent on the selected phase shift, which can be set by the control unit according to the request of the operator. The total heating power can thus be adjusted via the choice of the frequency of the heating current and the ratio of the heating power through the choice of the phase shift, so that overall the heating power of at least two Heizinduktoren can be set independently of each other at least in a large range of values.

Ein zusätzlicher Freiheitsgrad kann eröffnet werden, wenn die Steuereinheit zumindest in einem Bereich von Parametern das Verhältnis der Heizleistungen durch eine Einstellung von Pulslängen der von den Wechselrichtern erzeugten Heizstrompulse steuern kann.An additional degree of freedom can be opened if, at least in a range of parameters, the control unit can control the ratio of the heating powers by setting pulse lengths of the heating current pulses generated by the inverters.

Ein Gleichstromanteil im Heizstrom kann in diesem Fall vermieden werden, wenn die Pulslängen der beiden Wechselrichter auf den gleichen Wert eingestellt werden und dieser Wert bei vorgegebener Frequenz abhängig von dem gewünschten Verhältnis der Heizleistungen gewählt wird.A DC component in the heating current can be avoided in this case, if the pulse lengths of the two inverters are set to the same value and this value is selected at a given frequency depending on the desired ratio of the heating powers.

Die Heizleistungen können abhängig von den Vorgaben des Benutzers ohne aufwendige Berechnungen eingestellt werden, wenn das Kochfeld eine Speichereinheit zum Speichern eines wenigstens zweidimensionalen Kennfelds umfasst. Das Kennfeld speichert die einzustellende Phasenverschiebung und/oder die Pulslängen abhängig von dem anzusteuernden Verhältnis der Heizleistungen und der Gesamtheizleistung der beiden Heizinduktoren.The heating powers can be set depending on the specifications of the user without complex calculations when the hob comprises a memory unit for storing an at least two-dimensional map. The characteristic map stores the phase shift to be set and / or the pulse lengths as a function of the ratio of the heating powers to be controlled and the total heat output of the two heating inductors.

Durch die Verwendung von zwei gemeinsamen Schwingkreiskondensator, die mit beiden Heizinduktoren in Reihe geschaltet sind, wobei jeder der beiden Schwingkreiskondensator mit einem Pol der Stromversorgungseinheit verbunden ist und die Wechselrichter jeweils eine Halbbrückenschaltung zwischen den beiden Polen bilden, können die elektromagnetischen Emissionseigenschaften des Kochfelds verbessert werden.By using two common resonant circuit capacitor, which are connected in series with both heating inductors, each of the two resonant circuit capacitor is connected to a pole of the power supply unit and the inverters each form a half-bridge circuit between the two poles, the electromagnetic emission properties of the hob can be improved.

Die Resonanzfrequenz des Schwingkreises bzw. des Gesamtsystems kann verändert werden, wenn der gemeinsame Schwingkreiskondensator Teil einer gemeinsamen Schwingkreiskondensatoranordnung mit veränderbarer Gesamtkapazität ist. Dazu kann beispielsweise ein gemeinsamer Schwingkreiskondensator zugeschaltet oder von dem System getrennt werden.The resonant frequency of the resonant circuit or of the overall system can be changed if the common oscillator capacitor is part of a common oscillator circuit capacitor arrangement with a variable total capacitance. For this purpose, for example, a common resonant circuit capacitor can be switched on or disconnected from the system.

Der Erfindungsgedanke ist ohne weiteres auf Kochfelder mit drei oder mehr Heizinduktoren verallgemeinerbar, die mit einem oder mehreren gemeinsamen Kondensatoren in Reihe zu einem Schwingkreis verbunden sind.The inventive concept is readily generalizable to hobs with three or more heating inductors connected in series with one or more common capacitors to a resonant circuit.

Ein weiterer Aspekt der Erfindung betrifft ein Verfahren zum Betreiben eines Kochfelds mit wenigstens zwei Heizinduktoren, die mit zumindest einem Kondensator in Reihe zu einem Schwingkreis verbunden sind. Das Kochfeld umfasst ferner zwei Wechselrichter zum Erzeugen von Heizströmen für die Heizinduktoren.Another aspect of the invention relates to a method for operating a hob with at least two heating inductors, which are connected to at least one capacitor in series with a resonant circuit. The hob further includes two inverters for generating heating currents for the heating inductors.

Es wird vorgeschlagen, dass der gemeinsame Kondensator mit beiden Heizinduktoren geschaltet ist und dass ein Verhältnis der Heizleistungen der beiden Heizinduktoren durch eine Einstellung einer Phasenverschiebung zwischen den Schaltsignalen der beiden Wechselrichter und/oder durch eine Einstellung der Pulslänge der Heizströme bei vorgegebener Periodendauer gesteuert wird.It is proposed that the common capacitor is connected to both Heizinduktoren and that a ratio of the heating power of the two Heizinduktoren is controlled by adjusting a phase shift between the switching signals of the two inverters and / or by adjusting the pulse length of the heating currents for a given period.

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Es zeigen:

Fig. 1
den schematischen Aufbau eines Kochfelds mit zwei Heizinduktoren und einem Paar von gemeinsam verwendeten Schwingkreiskondensatoren,
Fig. 2
die Pulsformen der von zwei Wechselrichtern des Kochfelds aus Fig. 1 erzeugten Heizströme gemäß einem erfindungsgemäßen Steuerverfahren,
Fig. 3
ein zweidimensionales Kennfeld des Verhältnisses der Heizleistungen von zwei Heizinduktoren eines Kochfelds gemäß den Figuren 1 und 2,
Fig. 4
ein zweidimensionales Kennfeld zur Bestimmung einer Gesamtheizleistung der beiden Heizinduktoren eines erfindungsgemäßen Kochfelds und
Fig. 5
den schematischen Aufbau eines erfindungsgemäßen Kochfelds nach einer alternativen Ausgestaltung der Erfindung mit einer Schwingkreiskondensatoranordnung mit veränderbarer Gesamtkapazität.
Show it:
Fig. 1
the schematic structure of a hob with two Heizinduktoren and a pair of commonly used resonant circuit capacitors,
Fig. 2
the pulse shapes of the two inverters of the hob Fig. 1 generated heating currents according to a control method according to the invention,
Fig. 3
a two-dimensional map of the ratio of the heating power of two Heizinduktoren a hob according to the Figures 1 and 2 .
Fig. 4
a two-dimensional map for determining a total heat output of the two Heizinduktoren a hob according to the invention and
Fig. 5
the schematic structure of a hob according to the invention according to an alternative embodiment of the invention with a resonant circuit capacitor assembly with a variable total capacity.

Fig. 1 zeigt schematisch den Aufbau eines Induktionskochfelds mit zwei Heizinduktoren 10a, 10b, die jeweils an den Ausgang eines Wechselrichters 12a, 12b angeschlossen sind. Die Wechselrichter 12a, 12b werden von einer Stromversorgungseinheit mit Gleichstrom versorgt. Die Stromversorgungseinheit einhält ein Filter 14 und einen Gleichrichter 16. Das Filter 14 glättet die aus einer Phase 18 eines Haushaltsstromnetzes bezogene 50 Hz-Wechselspannung, die von dem Gleichrichter 16 in einen Gleichstrom umgewandelt wird. Fig. 1 shows schematically the structure of an induction cooktop with two heating inductors 10a, 10b, which are each connected to the output of an inverter 12a, 12b. The inverters 12a, 12b are supplied with direct current by a power supply unit. The power supply unit includes a filter 14 and a rectifier 16. The filter 14 smoothes the 50 Hz AC voltage obtained from a phase 18 of a household power network, which is converted by the rectifier 16 into a DC current.

Zwischen dem Gleichrichter 16 und jedem der Wechselrichter 12a, 12b ist jeweils ein Dämpfungskondensator 20a, 20b angeordnet, der als Tiefpassfilter wirkt und eine Rückkopplung der von den Wechselrichtern 12a, 12b erzeugten hochfrequenten Heizströme in das Haushaltsstromnetz verhindert.Between the rectifier 16 and each of the inverters 12a, 12b, a respective damping capacitor 20a, 20b is arranged, which acts as a low-pass filter and prevents feedback of the high-frequency heating currents generated by the inverters 12a, 12b in the household power grid.

Die Wechselrichter 12a, 12b sind in einer Halbbrücken-Schaltung zwischen den beiden Polen der gleichgerichteten Versorgungsspannung angeordnet. Die Wechselrichter 12a, 12b bestehen jeweils aus einem Paar von IGBTs oder MOSFETs mit einer antiparallel angeordneten Freilaufdiode und werden zur Erzeugung eines hochfrequenten Heizstroms mit einer Frequenz von typischerweise 20 bis 100 kHz betrieben. Dazu schaltet die Steuereinheit die beiden Halbleiterschalter der Wechselrichter 12a, 12b abwechselnd ein und aus. Dabei kann die Steuereinheit 22 sowohl die Periode T der Ein- und Ausschaltvorgänge als auch die relative Dauer der Ein- und Ausschaltphasen und damit deren Pulslänge Pa, Pb unabhängig voneinander bestimmen.The inverters 12a, 12b are arranged in a half-bridge circuit between the two poles of the rectified supply voltage. The inverters 12a, 12b each consist of a pair of IGBTs or MOSFETs with an antiparallel freewheeling diode and are operated to generate a high-frequency heating current having a frequency of typically 20 to 100 kHz. For this purpose, the control unit switches the two semiconductor switches of the inverters 12a, 12b alternately on and off. In this case, the control unit 22 can determine both the period T of the switching on and off as well as the relative duration of the switching on and off phases and thus their pulse length Pa, Pb independently.

Erfindungsgemäß werden die Ausgänge der Heizinduktoren 10a, 10b zusammengeführt und mit einer gemeinsamen Schwingkreiskondensatoranordnung 24 verbunden, die zwei jeweils mit beiden Heizinduktoren 10a, 10b verbundene Schwingkreiskondensatoren 26a, 26b umfasst. Die Schwingkreiskondensatoren 26a, 26b sind mit beiden Heizinduktoren 10a, 10b in Reihe geschaltet und andererseits jeweils mit einem Pol der das Filter 14 und den Gleichrichter 16 umfassenden Stromversorgungseinheit verbunden. Die beiden Schwingkreiskondensatoren 26a, 26b sind äquivalent zu einem in einer Verbindungsleitung 28 angeordneten gemeinsamen Kondensator, der dann die doppelte Kapazität haben müsste und dessen Kapazität zusammen mit der Induktivität eines der Heizinduktoren 10a, 10b die Resonanzfrequenz des Schwingkreises bestimmen würde.According to the invention, the outputs of the heating inductors 10a, 10b are brought together and connected to a common oscillating circuit capacitor arrangement 24, which comprises two resonant circuit capacitors 26a, 26b respectively connected to both heating inductors 10a, 10b. The resonant circuit capacitors 26a, 26b are connected in series with both heating inductors 10a, 10b and, on the other hand, each connected to one pole of the power supply unit comprising the filter 14 and the rectifier 16. The two resonant circuit capacitors 26a, 26b are equivalent to a common capacitor arranged in a connecting line 28, which would then have twice the capacitance and whose capacitance together with the inductance of one of the heating inductors 10a, 10b would determine the resonant frequency of the resonant circuit.

Die Darstellung in Fig. 1 ist insbesondere insoweit vereinfacht, als das Kochfeld auch mehr als zwei Induktoren umfassen kann, die entweder paarweise mit gemeinsamen Schwingkreiskondensatoranordnungen 24 verbunden sein können oder auch in Gruppen von drei oder mehr Heizinduktoren einer gemeinsamen Schwingkreiskondensatoranordnung 24 zugeordnet sein können.The representation in Fig. 1 is particularly simplified insofar as the cooktop can also comprise more than two inductors, which can either be connected in pairs to common resonant circuit capacitor arrangements 24 or can also be assigned in groups of three or more heating inductors to a common oscillator circuit capacitor arrangement 24.

Fig. 2 zeigt die Schaltsignale, die die Steuereinheit 22 über hier nicht dargestellte Steuerleitungen an die Halbleiterschalter der Wechselrichter 12a, 12b überträgt. Die in Fig. 2 obere Kurve Q1 entspricht dem Signal des oberen Schalters des oberen Wechselrichters 12a in Fig. 1, die zweite Kurve Q2 zeigt das Schaltsignal des unteren Schalters des oberen Wechselrichters 12a und die Kurven Q3 und Q4 zeigen die Schaltsignale der beiden unipolaren, bidirektionalen Halbleiterschalter des unteren Wechselrichters 12b. Fig. 2 shows the switching signals, which transmits the control unit 22 via control lines, not shown here to the semiconductor switches of the inverters 12a, 12b. In the Fig. 2 Upper curve Q1 corresponds to the signal of the upper switch of the upper inverter 12a in FIG Fig. 1 the second curve Q2 shows the switching signal of the lower switch of the upper inverter 12a, and the curves Q3 and Q4 show the switching signals of the two unipolar bidirectional semiconductor switches of the lower inverter 12b.

Die Steuereinheit 22 schaltet jeden der Schalter mit einer Periode T im Wechsel ein und aus. Die Periode T und damit die Frequenz des von den Wechselrichtern 12a, 12b erzeugten Heizstroms ist für beide Wechselrichter 12a, 12b gleich. Dadurch kann es nicht zu Interferenzen kommen. Die Schaltpulse sind jedoch um eine Verzögerung d gegeneinander phasenverschoben, die Pulslängen Pa, Pb der beiden Wechselrichter sind unterschiedlich und können insbesondere auch von der üblichen Wahl Pa = T/2 bzw. Pb = T/2 abweichen. Durch die Wahl der Verzögerung d und der Pulslängen Pa, Pb kann die Steuereinheit 22 flexibel die Amplituden der die Heizinduktoren 10a, 10b durchfließenden Heizströme einstellen und damit die Heizleistungen der Heizinduktoren 10a, 10b bestimmen.The control unit 22 turns on and off each of the switches with a period T in turn. The period T and thus the frequency of the heating current generated by the inverters 12a, 12b is the same for both inverters 12a, 12b. This can not cause interference. However, the switching pulses are phase-shifted by a delay d from each other, the pulse lengths Pa, Pb of the two inverters are different and may in particular also deviate from the usual choice Pa = T / 2 or Pb = T / 2. By selecting the delay d and the pulse lengths Pa, Pb, the control unit 22 can flexibly adjust the amplitudes of the heating currents flowing through the heating inductors 10a, 10b and thus determine the heating powers of the heating inductors 10a, 10b.

Fig. 3 zeigt schematisch ein zweidimensionales Kennfeld, welches in der Speichereinheit 30 der Steuereinheit 22 abgelegt ist und von der Steuereinheit 22 zum Bestimmen des Verhältnisses der Heizleistungen genutzt wird. Das Kennfeld gibt das Verhältnis der Heizleistung abhängig von der Frequenz des Heizstroms und der Verzögerung d an, wobei letztere als Bruchteil der Periode T angegeben wird. Die in Fig. 3 illustrierten Linien sind Linien mit konstantem Verhältnis der Heizleistungen. Fig. 3 schematically shows a two-dimensional map, which is stored in the memory unit 30 of the control unit 22 and is used by the control unit 22 for determining the ratio of the heating powers. The map indicates the ratio of the heating power depending on the frequency of the heating current and the delay d, the latter being indicated as a fraction of the period T. In the Fig. 3 Illustrated lines are lines with constant heating power ratio.

Fig. 4 zeigt ein weiteres zweidimensionales Kennfeld aus der Speichereinheit 30, das die Gesamtheizleistung der Heizinduktoren 10a, 10b in Abhängigkeit von der Frequenz und dem Anteil d/T der Verzögerung d an der Periode T angibt. In Fig. 4 sind ebenfalls Linien mit konstanter Gesamtheizleistung dargestellt. Fig. 4 FIG. 12 shows another two-dimensional map from the memory unit 30 indicating the total heating power of the heating inductors 10a, 10b as a function of the frequency and the proportion d / T of the delay d at the period T. FIG. In Fig. 4 Also shown are lines with constant total heat output.

Die Figuren 3 und 4 betreffen den vereinfachten Fall Pa = Pb = T/2, wobei die Totzeiten t1 bis t4 (Fig. 2) in geeigneter Weise berücksichtigt sind. Die Totzeiten t1 bis t4 entsprechen den Zeiten, in denen der entsprechende Halbleiterschalter zwar offen ist, der Strom aber in die Freilaufrichtung der antiparallel zu diesem Halbleiterschalter angeordneten Freilaufdiode fließt. Die Halbleiterschalter der Wechselrichter 12a, 12b werden in der Regel während dieser Phase geöffnet, um Einschaltverluste zu vermeiden. Dies ist jedoch nur in einem bestimmten Parameterbereich möglich, der in den Figuren 3 und 4 außerhalb des schraffiert dargestellten verbotenen Bereichs B liegt. Innerhalb dieses verbotenen Bereiches B treten harte Schaltvorgänge auf, in denen der Strom abrupt unterbrochen wird und die zu Schaltverlusten führen.The FIGS. 3 and 4 relate to the simplified case Pa = Pb = T / 2, where the dead times t1 to t4 ( Fig. 2 ) are taken into account in a suitable manner. The dead times t1 to t4 correspond to the times in which the corresponding semiconductor switch is open, but the current flows in the freewheeling direction of the freewheeling diode arranged in antiparallel to this semiconductor switch. The semiconductor switches of the inverters 12a, 12b are usually opened during this phase in order to avoid switch-on losses. However, this is only possible in a certain parameter range, which in the FIGS. 3 and 4 outside the hatched area B shown hatched. Within this prohibited area B hard switching operations occur in which the current is interrupted abruptly and lead to switching losses.

Die Steuereinheit 22 berechnet bei vorgegebener Soll-Heizleistung der Heizinduktoren 10a, 10b zunächst die gewünschte Gesamt-Heizleistung und ordnet diese einer der in Fig. 4 dargestellten Isolinien mit konstanter Gesamtheizleistung zu. Anschließend bestimmt die Steuereinheit 22 das Verhältnis der beiden Soll-Heizleistungen der Heizinduktoren 10a, 10b und ermittelt eine entsprechende Isolinie in dem Kennfeld in Fig. 3. Der Schnittpunkt dieser beiden Isolinien wird bestimmt und dessen Koordinaten ermittelt, um so die von der Steuereinheit 22 anzusteuernde Frequenz und die Verzögerung d zu bestimmen. Dieser Vorgang kann natürlich vorab für alle Paare von gewünschten Heizleistungen durchgeführt werden, so dass die Frequenz und die Verzögerung d direkt aus jeweils einem Kennfeld ermittelt werden können.The control unit 22 first calculates the desired total heating power for a given desired heat output of the heating inductors 10a, 10b and assigns this to one of the in Fig. 4 shown Isolinien with constant total heat output too. Subsequently, the control unit 22 determines the ratio of the two desired heating powers of the heating inductors 10a, 10b and determines a corresponding isoline in the map in FIG Fig. 3 , The intersection of these two isolines is determined and its coordinates are determined so as to determine the frequency to be controlled by the control unit 22 and the delay d. Of course, this process can be carried out beforehand for all pairs of desired heat outputs, so that the frequency and the delay d can be determined directly from a respective map.

Falls der Schnittpunkt innerhalb des verbotenen Bereich B liegt, werden die Pulslängen Pa, Pb variiert, um so bei vorgegebener Pulslänge Pa, Pb für geeignete Heizfrequenzen die geeignete Verzögerung d zu bestimmen. In der Speichereinheit 30 sind dazu Kennfelder für unterschiedliche Verhältnisse von Pulslängen Pa, Pb abgelegt.If the point of intersection is within the forbidden area B, the pulse lengths Pa, Pb are varied so as to determine the appropriate delay d for a given pulse length Pa, Pb for suitable heating frequencies. In the memory unit 30 to maps for different ratios of pulse lengths Pa, Pb are stored.

Fig. 5 zeigt ein weiteres alternatives Ausführungsbeispiel der Erfindung mit einer schaltbaren Schwingkreiskondensatoranordnung 24, die insgesamt vier Schwingkreiskondensatoren 26a, 26b, 26c, 26d umfasst. Die Schwingkreiskondensatoren 26c, 26d können abhängig von der gewünschten Resonanzfrequenz mittels eines Schalters 32 zu- oder abgeschaltet werden, wodurch Schaltverluste vermieden werden können und der verbotene Bereich B mit hohen Schaltverlusten verschoben werden kann. Selbstverständlich sind auch Schwingkreiskondensatoranordnungen 24 mit kontinuierlich verstellbaren Kondensatoren oder mit mehr als zwei verschiedenen möglichen Werten der Gesamtkapazität denkbar. Fig. 5 shows a further alternative embodiment of the invention with a switchable oscillator capacitor assembly 24, which comprises a total of four resonant circuit capacitors 26a, 26b, 26c, 26d. The resonant circuit capacitors 26c, 26d can be switched on or off depending on the desired resonance frequency by means of a switch 32, whereby switching losses can be avoided and the forbidden region B can be shifted with high switching losses. Of course, resonant circuit capacitor arrangements 24 with continuously variable capacitors or with more than two different possible values of the total capacitance are also conceivable.

Bezugszeichenreference numeral

1010
Heizinduktorheating inductor
1212
Wechselrichterinverter
1414
Filterfilter
1616
Gleichrichterrectifier
1818
Phasephase
2020
Dämpfungskondensatorsnubber capacitor
2222
Steuereinheitcontrol unit
2424
SchwingkreiskondensatoranordnungResonant circuit capacitor array
2626
SchwingkreiskondensatorResonant circuit capacitor
2828
Verbindungsleitungconnecting line
3030
Speichereinheitstorage unit
3232
Schalterswitch
BB
BereichArea
dd
Verzögerungdelay
Q1Q1
KurveCurve
Q2Q2
KurveCurve
Q3Q3
KurveCurve
Q4Q4
KurveCurve
PaPa
Pulslängepulse length
Pbpb
Pulslängepulse length
TT
Periodeperiod

Claims (9)

  1. Cooktop with a power supply unit with two poles, at least two heating inductors (10a, 10b), each of which is connected to at least one resonant circuit capacitor (26a, 26b) in order to form a resonant circuit, and with at least two inverters (12a, 12b) for supplying one of the heating inductors (10a, 10b) with a heating current in each case, wherein the inverters (12a, 12b) in each case form a half-bridge circuit between the two poles of the power supply unit and the respective heating inductor (10a, 10b) is connected at a centre point of the half-bridge circuit to the two inverters (12a, 12b), characterised in that at least one common resonant circuit capacitor (26a, 26b) is connected to both heating inductors (10a, 10b) and to at least one pole of the power supply unit.
  2. Cooktop according to claim 1, characterised by a control unit (22) which is configured to operate the inverters (12a, 12b) at the same frequency in at least one operating mode and to control the ratio of the heating capacities of the two heating inductors (10a, 10b) by means of an adjustment of a phase shift (d) between the switching signals (Q1-Q4) of the two inverters (12a, 12b).
  3. Cooktop according to claim 2, characterised in that the control unit (22) is configured to control a ratio of the heating capacities of the heating inductors (10a, 10b) within at least one range of parameters by means of an adjustment of pulse lengths (Pa, Pb) of the heating current pulses generated by the inverters (12a, 12b).
  4. Cooktop according to claim 3, characterised in that the control unit (22) is configured to set the pulse lengths (Pa, Pb) of the two inverters (12a, 12b) to the same value and to choose said value for a predefined frequency as a function of the ratio of the setpoint heating capacities of the heating inductors (10a, 10b).
  5. Cooktop according to one of claims 2 to 4, characterised by a memory unit (30) for storing at least one at least two-dimensional characteristics map which contains the phase shift (d) that is to be set as a function of the ratio of the heating capacities that is to be activated and of the total heating capacity of the two heating inductors (10a, 10b).
  6. Cooktop according to one of claims 1 to 5, characterised by at least two common resonant circuit capacitors (26a-26e) which are connected in series with both heating inductors (10a, 10b), wherein each of the two resonant circuit capacitors (26a, 26b) is connected to a pole of the power supply unit.
  7. Cooktop according to one of the preceding claims, characterised in that the common resonant circuit capacitor (26a, 26b) is part of a common resonant circuit capacitor arrangement (24) with variable total capacitance.
  8. Cooktop according to one of the preceding claims, characterised by three or more heating inductors (10a, 10b) which are connected in series with a common resonant circuit capacitor (26a, 26b).
  9. Method for operating a cooktop with a power supply unit with two poles, at least two heating inductors (10a, 10b) which are connected to at least one resonant circuit capacitor (26a, 26b) in order to form a resonant circuit, and with at least two inverters (12a, 12b) for generating heating currents for the heating inductors (10a, 10b), wherein the inverters (12a, 12b) in each case form a half-bridge circuit between the two poles of the power supply unit and the respective heating inductor (10a, 10b) is connected at a centre point of the half-bridge circuit to the two inverters (12a, 12b),
    characterised in that at least one common resonant circuit capacitor (26a, 26b) is connected to both heating inductors (10a, 10b) and to at least one pole of the power supply unit and in that a ratio of the heating capacities of the two heating inductors (10a, 10b) is controlled by means of an adjustment of a phase shift between the switching signals of the two inverters (12a, 12b).
EP10778726.9A 2009-11-05 2010-10-29 Cook top comprising at least two heating inductors Active EP2497332B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200930959A ES2378607B1 (en) 2009-11-05 2009-11-05 COOKING FIELD WITH AT LEAST TWO HEATING INDUCTORS.
PCT/IB2010/054907 WO2011055283A1 (en) 2009-11-05 2010-10-29 Cook top comprising at least two heating inductors

Publications (2)

Publication Number Publication Date
EP2497332A1 EP2497332A1 (en) 2012-09-12
EP2497332B1 true EP2497332B1 (en) 2016-08-17

Family

ID=43432130

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Application Number Title Priority Date Filing Date
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EP (1) EP2497332B1 (en)
CN (1) CN102598849B (en)
ES (2) ES2378607B1 (en)
PL (1) PL2497332T3 (en)
WO (1) WO2011055283A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2453714A1 (en) * 2010-11-10 2012-05-16 BSH Bosch und Siemens Hausgeräte GmbH Induction heating device
CN103836682B (en) * 2012-11-26 2016-12-21 美的集团股份有限公司 A kind of electromagnetic oven with multiple kitchen range
CN103307646B (en) * 2013-05-14 2015-10-21 广东鼎燊科技有限公司 A kind of commercial induction cooker unloading pick-up unit and method
US10993292B2 (en) * 2017-10-23 2021-04-27 Whirlpool Corporation System and method for tuning an induction circuit
EP4074142A1 (en) * 2019-12-13 2022-10-19 BSH Hausgeräte GmbH Induction device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390769A (en) * 1980-05-29 1983-06-28 General Electric Company Induction heating apparatus providing smooth power control
IT1281843B1 (en) * 1995-01-25 1998-03-03 Meneghetti Ampelio & C S N C CONTROL DEVICE ESPECIALLY FOR MULTI-PLATE INDUCTION COOKERS
ES2143430B1 (en) 1998-09-08 2000-12-16 Balay Sa TWO OUTPUTS INVERTER CIRCUIT, AND CIRCUIT AND PROCEDURE FOR CONTROLLING THE POWER DELIVERED IN THE INVERTER OUTPUTS.
ES2265758B1 (en) * 2005-03-01 2007-11-16 Bsh Electrodomesticos España, S.A. HEATING DEVICE FOR AN INDUCTION KITCHEN.
FR2902600B1 (en) * 2006-06-14 2008-09-05 Brandt Ind Sas INDUCTION SYSTEM, METHOD FOR SUPPLYING AN INDUCTOR AND COOKTOP HAVING SUCH A SYSTEM
ES2330496B1 (en) * 2007-10-31 2010-09-08 Bsh Electrodomesticos España, S.A. COOKING DEVICE.
CN201178498Y (en) * 2008-04-03 2009-01-07 深圳和而泰智能控制股份有限公司 Surge protection circuit for electromagentic furnace

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Publication number Publication date
ES2378607B1 (en) 2013-03-14
CN102598849A (en) 2012-07-18
PL2497332T3 (en) 2017-01-31
WO2011055283A1 (en) 2011-05-12
EP2497332A1 (en) 2012-09-12
CN102598849B (en) 2014-12-31
ES2589044T3 (en) 2016-11-08
ES2378607A1 (en) 2012-04-16

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Inventor name: GARCIA JIMENEZ, JOSE-RAMON

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