EP2564666B1 - Hob device - Google Patents

Hob device Download PDF

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Publication number
EP2564666B1
EP2564666B1 EP11720183.0A EP11720183A EP2564666B1 EP 2564666 B1 EP2564666 B1 EP 2564666B1 EP 11720183 A EP11720183 A EP 11720183A EP 2564666 B1 EP2564666 B1 EP 2564666B1
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EP
European Patent Office
Prior art keywords
time interval
switching
during
switching unit
cooktop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP11720183.0A
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German (de)
French (fr)
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EP2564666A1 (en
Inventor
Daniel Anton Falcon
Carlos Bernal Ruiz
José Miguel Burdio Pinilla
Jose Maria De La Cuerda Ortin
Jose-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
Jose 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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Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Priority to PL11720183T priority Critical patent/PL2564666T3/en
Publication of EP2564666A1 publication Critical patent/EP2564666A1/en
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Publication of EP2564666B1 publication Critical patent/EP2564666B1/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
    • H05B6/04—Sources of current
    • 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

Definitions

  • a cooktop with an inverter known, by means of which a power supply line can be interrupted and produced, flows through the generated during operation of a current generated by a power line voltage and leads to a switching element.
  • the cooktop has a control device, which controls the inverter in the operating process such that the inverter interrupts the power supply line during a total time interval. Further, in the operation, the control device causes the power supply line to be established immediately before and immediately after the time interval. Furthermore, the control device causes switching of the switching element, which starts and ends during the time interval and which brings the switching element in a specific switching position. The switching element remains in the switching position during a cooking process, wherein current flows through the switching element during the cooking process and the current is used for inductive heating of a cookware.
  • a cooktop with an inverter and with two heating elements is known, which are alternately supplied with power in a single operation of a single inverter.
  • a switching position of an SPDT relay determines which of the two heating elements will be supplied with power.
  • At the inverter is a rectified AC voltage.
  • the rectified AC voltage has a minimum.
  • a “power supply voltage” is to be understood in particular a periodic voltage, with which in a power plant, in particular a nuclear power plant or a coal power plant, generated electricity, after it was conducted by power lines from the power plant to a consumer household, is delivered to the consumer household, said an effective value of the voltage is preferably 230 V, and wherein preferably a frequency of the periodic voltage is 50 Hz or 60 Hz.
  • a "current generated by means of a mains voltage” is to be understood in particular as meaning a current caused by the action of the mains voltage, wherein the current is preferably a rectified single-phase alternating current and particularly preferably has a frequency of 100 Hz or 120 Hz.
  • FIGS first conductive connection of the switching element during the time interval initially exists and a state of the switching element during the time interval changed such that the first conductive connection is completely interrupted at least one time of the time interval and that the second conductive connection of the switching element during the time interval initially completely interrupted is and a state of the switching element is changed during the time interval such that the second conductive connection completely at least one time of the time interval, wherein in particular in the case in which d em making the second conductive connection, two contacts of the switching element collide, the collision is completely completed before one end of the time interval.
  • a high efficiency can be achieved.
  • a cost-effective design can be achieved together with a high heating efficiency.
  • a low cost construction of the switching element and a high life of the switching element combined with a single operation power supply of two different heating elements each contributing to different cooking operations can be achieved by a single inverter.
  • a temporally uniform load of a storm network can be achieved.
  • the cooktop device has at least one voltage supply unit which, during the operating process, applies a time-dependent voltage, which has a minimum point essentially at a middle of the first time interval, to the switching unit.
  • a “middle” of the first time interval is to be understood in particular as meaning a time which has the same time interval from one end to the beginning of the time interval.
  • a “minimum point” of the voltage should in particular be understood as a point in time at which the voltage has a minimum.
  • a “minimum” of the time-dependent voltage is understood in particular to be a voltage value of the voltage at a specific time, which lies within a time interval in which the voltage only assumes values which are greater than or equal to the voltage value, the time being from a start point and an end point of the latter time interval.
  • the voltage "essentially” has a minimum point in the middle of the first time interval, it should be understood in particular that the minimum point is at most 25 percent, preferably at most 10 percent and more preferably at most 2 percent of a total duration of the time interval from the center , In this way, a comfortable usability of the cooktop device can be achieved. In particular, a uniform load on the power grid can be achieved during operation of the hob device.
  • the first time interval is at least two milliseconds.
  • a gentle switching during the first time interval can be reliably achieved.
  • the first time interval is at least four milliseconds in size.
  • a gentle switching can be achieved particularly reliable.
  • deviations a reaction time of the switching element from a control to a start of a switching operation of a target reaction time can be compensated.
  • control device causes the switching unit in the operating process to interrupt the power supply periodically for at least a total period of time, which is substantially the same as the first time interval.
  • a time span which is "substantially" the same as the first time interval should be understood to mean, in particular, a time period whose length deviates from a length of the first time interval by at most forty percent, preferably by at most ten percent and particularly preferably by at most two percent ,
  • a single inverter in an operating operation in which two different heating elements are operated to carry out two different cooking operations, passes electricity to both heating elements.
  • the cooktop device has the first and at least one second switching element, which is connected in series with the first switching element, and the control device switches the second switching element in a second time interval and the control device interrupts the power supply line by means of the switching unit during the entire second time interval and the control device, by means of the switching unit, causes current to flow through the power supply line immediately before and immediately after the second time interval.
  • control device switch the switching unit in a first time period, which immediately precedes the first time interval, with a first set of switching parameters, and the control device switches the switching unit in a second time interval, which immediately follows the first time interval, with a second set of switching parameters, which is different from the first set of switching parameters.
  • the switching unit has at least two inverters, which are provided to influence a current flow through the first switching element. This allows a high degree of flexibility can be achieved.
  • the first switching element is a relay which has at least one coil. This allows a cost-effective design can be achieved.
  • the switching unit has at least one insulated gate bipolar transistor. Thereby, an efficient power control can be achieved.
  • FIG. 1 shows a plan view of a cooking hob with a cooking hob device according to the invention, designed as an induction cooker device, which has a plurality of cooking zones 34.
  • a circuit 36 ( FIG. 2a ) of the cooktop device has four coils formed as heating elements L 1 , L 2 , L 3 , L 4 , which are all simultaneously operated at different power levels. Each of the heating elements L 1 , L 2 , L 3 , L 4 is associated with one of the cooking zones 34, so that when using the cooktop each heating element L 1 exactly one cookware element, ie z. As a pot or pan, heated.
  • the circuit 36 has a switching unit 10, which is formed by a first and a second inverter 28, 30.
  • the first inverter 28 includes a first insulated gate bipolar transistor (hereinafter, the abbreviation "IGBT" is used) 32 and a second IGBT 33.
  • the inverter 30 has a first IGBT 44 and a second IGBT 46.
  • the circuit 36 has a country-specific AC voltage source U, which supplies a mains voltage with an effective value of 230 V and a frequency of 50 Hz.
  • the cooking hob device described is intended in particular for operation in Europe.
  • a corresponding AC power source provides a 60 Hz power line voltage.
  • the voltage of AC power source U first passes through a filter 40 of circuit 36, which eliminates high frequency noise and is essentially a low pass filter.
  • a voltage filtered by the filter 40 is rectified by a rectifier 42 of the circuit 36, which may be designed as a bridge rectifier, so that at a output of the rectifier 42 is a rectified voltage U g ( FIG. FIG.
  • the circuit 36 has two capacitors C 1 , C 2 .
  • a first contact of the capacitors C 1 , C 2 is conductively connected to the collector of the IGBT 32 and conductively connected to a collector of the IGBT 44.
  • a second contact of the capacitors C 1 , C 2 is conductively connected to the emitter of the IGBT 33 and conductively connected to the emitter of the IGBT 46.
  • An emitter of the IGBT 32 is conductively connected to a collector of the IGBT 33.
  • an emitter of the IGBT 44 is conductively connected to a collector of the IGBT 46.
  • the circuit 36 as a relay S 1 'trained switching element S 1 and five other relays S 2 , S 3 , S 4 , S 5 , S 6 on.
  • the relays S 1 ', S 2 , S 3 , S 4 , S 5 , S 6 are SPDT relay and identical.
  • Each of the relays S 1 ', S 2 , S 3 , S 4 , S 5 , S 6 has a first, a second and a third contact and a coil, wherein the first contacts by a corresponding control of the coil optionally with the second or the third contact is conductively connected.
  • the first contact of the relay S 3 is conductively connected to the emitter of the IGBT 32. Further, the second contact of the relay S 3 is connected to the first contact of the relay S 1 '.
  • the third contact of the relay S 3 is conductively connected to the first contact of the relay S 2 .
  • the second contact of the relay S 1 ' is conductively connected to a first contact of the heating element L 1 .
  • the third contact of the relay S 1 ' is conductively connected to a first contact of the heating element L 2 .
  • the second contact of the relay S 2 is conducting with a first contact of the heating element L 3 connected.
  • the third contact of the relay S 2 is conductively connected to a first contact of the heating element L 4 .
  • the first contact of the relay S 6 is conductively connected to the emitter of the IGBT 44. Further, the second contact of the relay S 6 is connected to the first contact of the relay S 4 .
  • the third contact of the relay S 6 is conductively connected to the first contact of the relay S 5 .
  • the second contact of the relay S 4 is conductively connected to a first contact of the heating element L 1 .
  • the third contact of the relay S 4 is conductively connected to a first contact of the heating element L 2 .
  • the second contact of the relay S 5 is conductively connected to a first contact of the heating element L 3 .
  • the third contact of the relay S 5 is conductively connected to a first contact of the heating element L 4 .
  • a second contact of the heating element L 1 is conductively connected to a second contact of the heating element L 2 . Further, a second contact of the heating element L 3 is conductively connected to a second contact of the heating element L 4 .
  • the circuit 36 also has capacitors C 3 , C 4 , C 5 , C 6 .
  • the second contact of the heating element L 1 is conductively connected to a first contact of the capacitor C 3 and to a first contact of the capacitor C 4 .
  • the second contact of the heating element L 3 is conductive to a first contact of the capacitor C5 and connected to a first contact of the capacitor C. 6
  • Second contacts of the capacitors C 3 and C 5 are conductively connected to the collector of the IGBT 32. Further, second contacts of the capacitors C 4 and C 6 are conductively connected to the emitter of the IGBT 46.
  • Both by means of the IGBT 32 and by means of the IGBT 33 is in each case a power supply to the first switching element S 1 , through which in an operating process, a generated by means of the AC voltage source U current flows, producible and interruptible.
  • a control device 14 of the circuit 36 which has two control units 56, 58, controls the switching unit 10 during the operating process, such that during a total time interval t (FIG. FIG. 3 ) for each one of the IGBTs 32, 33, 44, 46 is that a conductive connection between its collector and its emitter is interrupted.
  • the control device 14 is connected to the switching unit 10 and in particular to the gate terminals of the IGBTs 32, 33, 44, 46 (not shown).
  • Immediately before and immediately after the time interval t is at least one of the IGBTs 32, 33 and at least one of the IGBTs 44, 46 in a state in which its collector is conductively connected to its emitter.
  • control device 14 causes, during the entire time interval t only for each of the IGBTs 32, 33, that a conductive connection between its collector and its emitter is interrupted, while the IGBTs 44, 46, for example, in the time interval t can perform switching operations.
  • each of the first contact with the second contact is conductive connected.
  • the relay S 6 the first is conductively connected to the third contact.
  • FIG. 3 schematically a Bewerk Trent a switching operation of the relay S 1 'is illustrated, wherein on an abscissa 52, the time is shown.
  • a switching position 54 of the relay S 1 ' that is, a position of the first contact of the relay S 1 ' is shown in dashed lines.
  • the first relay S 1 ' in a first switching state, in which the first contact of the relay S 1 ' with the second contact of the relay S 1 'forms a conductive connection.
  • the conductive connection is free of current flow.
  • the control device 14 causes, during a time period t 2 , which is completely within the time interval t and which is spaced from end points of the time interval t, starting from the first switching state (FIG. FIG. 2a ) solves the conductive connection, the first contact of the relay S 1 'is finally separated from the second contact of the relay S 1 ' and subsequently impinges on the third contact and after the impact of the first and the third contact of the relay S 1 'a form a conductive connection, this conductive connection existing before one end of the time interval t ( FIG. 2b ) and during the time interval t is free from a current flow.
  • the control device 14 applies a voltage U s to the coil of the relay S 1 'at a time which has a time interval t 1 from a middle of the time interval t 2 , which characterizes a reaction time of the relay S 1 ' Switching the relay S 1 'caused in the period t 2 .
  • a total duration of the time interval t is the sum of the time period t 2 and twice the amount of the deviation time. Because the conductive connections of the relay S 1 'during the time interval t are de-energized, the switching operation of the relay S 1 ', which takes place during the time interval t, particularly gentle for the relay S 1 'and allows a long life of the relay S 1 ' , In principle, it is conceivable that during the time interval t apart from the relay S 1 'another of the relay S 2, S 3, S 4, S 5, S 6 performs a switching operation, which begins during the time interval t and ends.
  • the mains voltage has a frequency of 50 Hz.
  • the time interval t is less than half the period of the mains voltage and has a length of eight milliseconds.
  • the AC voltage source U, the filter 40 and the rectifier 42 form a voltage supply unit 18, which applies the voltage U g to the switching unit 10 during the operating process.
  • the voltage U g has a minimum point in a middle of the time interval t. Furthermore, a voltage delivered by the AC voltage source U has a zero crossing in the middle of the time interval t.
  • the capacitors C 1 and C 2 and the inactivity of the inverters 28, 30 ensure that the voltage U g is constant.
  • the control device 14 causes the switching unit 10 during the operation to interrupt periodically for periods of time t 3 , which are as long as the time interval t, all power supply lines which can be produced and interrupted by the switching unit 10.
  • a period T Mux of the periodic interruption is less than one second ( FIG. 4 ).
  • the period T Mux begins with one of the time periods t 3 , which is followed immediately by a first time period T S1 .
  • a switching operation of the switching element S 1 starts and ends, which switches the switching element S 1 from a state in which the first and third contacts of the switching element S 1 are conductively connected to a state in which the first and the second contact of the switching element S 1 are conductively connected, transferred.
  • the controller 14 causes each of the IGBTs 32, 33 to switch at a first frequency during the time period T S1 .
  • the time period T S1 is followed by one of the time periods t 3 , which is identical to the time interval t, immediately on.
  • the time interval t is followed immediately by a time interval T S2 .
  • the controller 14 causes each of the IGBTs 32, 33 to switch at a second frequency different from the first frequency during the time period T S2 .
  • a power is delivered to the heating element L 1 by means of the first inverter 28 (FIG. FIG. 2a ), which corresponds approximately to the power which during the second time period T S2 by means of the inverter 30 to the heating element L 2 ( FIG.
  • the inverter 30 supplies the heating element L 3 with power during the periods T S1 , T S2 .
  • the voltage U g is in periods that are free of all time intervals t 3 , periodically with a period that is half as large as the period of the power grid voltage.
  • the relay S 3 is a switching element S 3 ', which is connected in series with the switching element S 1 .
  • the control device 14 switches the relay S 3 in a second time interval which differs from the operating procedure in a second time interval which is seven milliseconds long ( FIG. 5 ).
  • the switching of the relay S 3 starts and ends in the second time interval.
  • the control device 14 causes each of the IGBTs 32, 33, 44, 46 to be in a blocking state during the entire second time interval, that is to say free from a conductive connection between its collector and its emitter.
  • at least one of the IGBTs 32, 33 and at least one of the IGBTs 44, 46 switches.
  • all the IGBTs 32, 33, 44, 46 are periodically switched by the control device 14.
  • the circuit 36 has further relays and further heating elements, which are connected by means of the further relay to the inverters 28, 30.
  • the relays S 1 ', S 2 , S 3 , S 4 , S 5 , S 6 which are designed as SPDT relays, are each replaced by two SPST relays.
  • switching unit C 6 capacitor 14 control device S 1 switching element 18 Power supply unit S 1 ' relay 28 inverter S 2 relay 30 inverter S 3 relay 32 Bipolar transistor with insulated gate electrode S 3 ' switching element S 4 relay 33 IGBT S 5 relay 34 cooking zone S 6 relay 36 circuit L 1 heating element 40 filter L 2 heating element 42 rectifier L 3 heating element 44 IGBT L 4 heating element 46 IGBT t time interval 52 abscissa t 1 distance 54 switch position t 2 Period of time 56 control unit t 3 Period of time 58 control unit T S1 period U AC voltage source T S2 period T Mux period U g tension U S tension C 1 capacitor C 2 capacitor C 3 capacitor C 4 capacitor C 5 capacitor

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

Description

Die Erfindung geht aus von einer Kochmuldenvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a hob device according to the preamble of claim 1.

Es ist eine Kochmulde mit einem Wechselrichter bekannt, mittels dem eine Stromzuleitung unterbrechbar und herstellbar ist, durch die bei einem Betriebsvorgang ein mittels einer Stromnetzspannung generierter Strom fließt und die zu einem Schaltelement führt. Die Kochmulde weist eine Steuervorrichtung auf, welche bei dem Betriebsvorgang den Wechselrichter derart steuert, dass der Wechselrichter die Stromzuleitung während eines gesamten Zeitintervalls unterbricht. Ferner veranlasst die Steuervorrichtung bei dem Betriebsvorgang, dass unmittelbar vor und unmittelbar nach dem Zeitintervall die Stromzuleitung hergestellt ist. Des Weiteren veranlasst die Steuervorrichtung ein Schalten des Schaltelements, das während des Zeitintervalls beginnt und endet und das das Schaltelement in eine bestimmte Schaltstellung bringt. Das Schaltelement verharrt während eines Kochvorgangs in der Schaltstellung, wobei Strom während des Kochvorgangs durch das Schaltelement fließt und der Strom zu einem induktiven Erhitzen eines Kochgeschirrs dient.There is a cooktop with an inverter known, by means of which a power supply line can be interrupted and produced, flows through the generated during operation of a current generated by a power line voltage and leads to a switching element. The cooktop has a control device, which controls the inverter in the operating process such that the inverter interrupts the power supply line during a total time interval. Further, in the operation, the control device causes the power supply line to be established immediately before and immediately after the time interval. Furthermore, the control device causes switching of the switching element, which starts and ends during the time interval and which brings the switching element in a specific switching position. The switching element remains in the switching position during a cooking process, wherein current flows through the switching element during the cooking process and the current is used for inductive heating of a cookware.

Ferner ist eine Kochmulde mit einem Wechselrichter und mit zwei Heizelementen bekannt, welche bei einem einzigen Betriebsvorgang von einem einzigen Wechselrichter abwechselnd mit Leistung versorgt werden. Eine Schaltstellung eines SPDT-Relais bestimmt, welches der beiden Heizelemente mit Leistung versorgt wird. An dem Wechselrichter liegt eine gleichgerichtete Wechselspannung an. Während eines Schaltens des Relais weist die gleichgerichtete Wechselspannung ein Minimum auf.Further, a cooktop with an inverter and with two heating elements is known, which are alternately supplied with power in a single operation of a single inverter. A switching position of an SPDT relay determines which of the two heating elements will be supplied with power. At the inverter is a rectified AC voltage. During a switching of the relay, the rectified AC voltage has a minimum.

Die Aufgabe der Erfindung besteht insbesondere darin, eine gattungsgemäße Vorrichtung mit verbesserten Eigenschaften hinsichtlich einer hohen Effizienz bereitzustellen. Die Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst, während vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung den Unteransprüchen entnommen werden können. Das Dokument DE 3610196 A1 offenbart eine Kochmuldenvorrichtung gemäß dem Oberbegriff von Anspruch 1. Es wird vorgeschlagen, dass das erste Zeitintervall kleiner ist als eine halbe Periodendauer der Stromnetzspannung. Unter einer "Schalteinheit" soll insbesondere eine Baueinheit verstanden werden, welche dazu vorgesehen ist, eine elektrisch leitende Verbindung herzustellen und zu unterbrechen, wobei die Baueinheit hierzu vorzugsweise einen Transistor aufweist. Unter "vorgesehen" soll insbesondere speziell ausgestattet und/oder speziell ausgelegt und/oder speziell programmiert verstanden werden. Unter einer "Stromzuleitung" soll insbesondere eine elektrisch leitende Verbindung verstanden werden. Unter einer "Stromnetzspannung" soll insbesondere eine periodische Spannung verstanden werden, mit welcher in einem Kraftwerk, wie insbesondere einem Kernkraftwerk oder einem Kohlekraftwerk, erzeugter Strom, nachdem er mittels Stromleitungen von dem Kraftwerk zu einem Verbraucherhaushalt geleitet wurde, an den Verbraucherhaushalt abgegeben wird, wobei ein Effektivwert der Spannung vorzugsweise 230 V beträgt und wobei vorzugsweise eine Frequenz der periodischen Spannung 50 Hz oder 60 Hz beträgt. Unter einem "mittels einer Stromnetzspannung generierten Strom" soll insbesondere ein durch ein Wirken der Stromnetzspannung verursachter Strom verstanden werden, wobei der Strom vorzugsweise ein gleichgerichteter Einphasenwechselstrom ist und besonders bevorzugt eine Frequenz von 100 Hz oder 120 Hz aufweist. Darunter, dass die "Schalteinheit die Stromzuleitung während eines gesamten Zeitintervalls unterbricht", soll insbesondere verstanden werden, dass die Schalteinheit bewirkt, dass die Stromzuleitung während des gesamten Zeitintervalls undurchlässig für elektrischen Strom ist. Unter einem "Schalten" des Schaltelements soll insbesondere ein Lösen einer elektrisch leitenden Verbindung, welche das Schaltelement in wenigstens einem Betriebszustand aufweist, und/oder ein Herstellen der elektrisch leitenden Verbindung verstanden werden. Darunter, dass das Schalten "während des Zeitintervalls beginnt und endet", soll für denjenigen Fall, dass das Schalten aus einem Lösen der elektrisch leitenden Verbindung besteht, insbesondere verstanden werden, dass die leitende Verbindung des Schaltelements während des Zeitintervalls zunächst besteht und ein Zustand des Schaltelements sich während des Zeitintervalls derart verändert, dass die leitende Verbindung zu wenigstens einem Zeitpunkt des Zeitintervalls vollständig unterbrochen ist. Darunter, dass das Schalten "während des Zeitintervalls beginnt und endet", soll für denjenigen Fall, dass das Schalten aus einem Herstellen der elektrisch leitenden Verbindung besteht, insbesondere verstanden werden, dass die leitende Verbindung des Schaltelements während des Zeitintervalls zunächst vollständig unterbrochen ist und ein Zustand des Schaltelements sich während des Zeitintervalls derart verändert, dass die leitende Verbindung zu wenigstens einem Zeitpunkt des Zeitintervalls vollständig besteht, wobei insbesondere in demjenigen Fall, in welchem bei dem Herstellen der leitende Verbindung zwei Kontakte des Schaltelements aufeinanderprallen, das Aufeinanderprallen vor einem Ende des Zeitintervalls vollständig abgeschlossen ist. Darunter, dass das Schalten "während des Zeitintervalls beginnt und endet", soll für den Fall, dass das Schalten aus einem Lösen einer ersten elektrisch leitenden Verbindung des Schaltelements und einem Herstellen einer zweiten elektrisch leitenden Verbindung des Schaltelements besteht, insbesondere verstanden werden, dass die erste leitende Verbindung des Schaltelements während des Zeitintervalls zunächst besteht und ein Zustand des Schaltelements sich während des Zeitintervalls derart verändert, dass die erste leitende Verbindung zu wenigstens einem Zeitpunkt des Zeitintervalls vollständig unterbrochen ist und dass die zweite leitende Verbindung des Schaltelements während des Zeitintervalls zunächst vollständig unterbrochen ist und ein Zustand des Schaltelements sich während des Zeitintervalls derart verändert, dass die zweite leitende Verbindung zu wenigstens einem Zeitpunkt des Zeitintervalls vollständig besteht, wobei insbesondere in demjenigen Fall, in welchem bei dem Herstellen der zweiten leitende Verbindung zwei Kontakte des Schaltelements aufeinanderprallen, das Aufeinanderprallen vor einem Ende des Zeitintervalls vollständig abgeschlossen ist. Mit einer erfindungsgemäßen Ausgestaltung kann eine hohe Effizienz erreicht werden. Insbesondere kann eine kostengünstige Bauweise zusammen mit einer hohen Heiz-Effizienz erreicht werden. Im Besonderen können eine kostengünstige Bauweise des Schaltelements und eine hohe Lebensdauer des Schaltelements kombiniert mit einer bei einem einzigen Betriebsablauf stattfindenden Stromversorgung zweier verschiedener Heizelemente, welche jeweils zu verschiedenen Kochvorgängen beitragen, durch einen einzigen Wechselrichter erreicht werden. Insbesondere kann erreicht werden, dass das Schaltelement bei dem Betriebsablauf schonend geschaltet wird, indem bei einem Unterbrechen einer ersten elektrisch leitenden Verbindung und bei einem Herstellen einer zweiten elektrisch leitenden Verbindung durch das Schaltelement kein Strom durch die Verbindungen fließt. Außerdem kann insbesondere eine zeitlich gleichmäßige Belastung eines Stormnetzes erreicht werden.The object of the invention is in particular to provide a generic device with improved properties in terms of high efficiency. The object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims. The document DE 3610196 A1 discloses a cooker device according to the preamble of claim 1. It is proposed that the first time interval is less than half a period of the mains voltage. A "switching unit" is to be understood in particular as a structural unit which is intended to produce and interrupt an electrically conductive connection, the structural unit preferably having a transistor for this purpose. By "intended" is meant in particular specially equipped and / or specially designed and / or specially programmed. A "power supply line" is to be understood in particular as an electrically conductive connection. A "power supply voltage" is to be understood in particular a periodic voltage, with which in a power plant, in particular a nuclear power plant or a coal power plant, generated electricity, after it was conducted by power lines from the power plant to a consumer household, is delivered to the consumer household, said an effective value of the voltage is preferably 230 V, and wherein preferably a frequency of the periodic voltage is 50 Hz or 60 Hz. A "current generated by means of a mains voltage" is to be understood in particular as meaning a current caused by the action of the mains voltage, wherein the current is preferably a rectified single-phase alternating current and particularly preferably has a frequency of 100 Hz or 120 Hz. By the fact that the "switching unit interrupts the power supply line during an entire time interval", it should be understood, in particular, that the switching unit causes the power supply line to be impermeable to electric current during the entire time interval. A "switching" of the switching element is intended in particular to be understood as meaning a release of an electrically conductive connection, which has the switching element in at least one operating state, and / or a production of the electrically conductive connection. Under that, that Switching "during the time interval begins and ends" is to be understood in particular for the case that the switching consists of a release of the electrically conductive connection, that the conductive connection of the switching element during the time interval initially and a state of the switching element during the Time interval changed such that the conductive connection is completely interrupted at least one time of the time interval. By the fact that the switching "starts and ends during the time interval" is to be understood in particular for the case that the switching consists of making the electrically conductive connection, that the conductive connection of the switching element is initially completely interrupted during the time interval and a State of the switching element is changed during the time interval such that the conductive connection is complete at least one time of the time interval, in particular in the case in which two contacts of the switching element collide in the manufacture of the conductive connection, the collision before an end of the time interval is completely completed. Assuming that the switching "starts and ends during the time interval", in the case where the switching consists of releasing a first electrically conductive connection of the switching element and establishing a second electrically conductive connection of the switching element, it should be understood in particular that FIGS first conductive connection of the switching element during the time interval initially exists and a state of the switching element during the time interval changed such that the first conductive connection is completely interrupted at least one time of the time interval and that the second conductive connection of the switching element during the time interval initially completely interrupted is and a state of the switching element is changed during the time interval such that the second conductive connection completely at least one time of the time interval, wherein in particular in the case in which d em making the second conductive connection, two contacts of the switching element collide, the collision is completely completed before one end of the time interval. With an embodiment according to the invention, a high efficiency can be achieved. In particular, a cost-effective design can be achieved together with a high heating efficiency. In particular, a low cost construction of the switching element and a high life of the switching element combined with a single operation power supply of two different heating elements each contributing to different cooking operations can be achieved by a single inverter. In particular, it can be achieved that the switching element is switched gently in the operation by no current flows through the compounds at a breaking of a first electrically conductive connection and in establishing a second electrically conductive connection through the switching element. In addition, in particular a temporally uniform load of a storm network can be achieved.

Ferner wird vorgeschlagen, dass die Kochmuldenvorrichtung wenigstens eine Spannungsversorgungseinheit aufweist, welche bei dem Betriebsvorgang eine zeitabhängige Spannung, welche im Wesentlichen in einer Mitte des ersten Zeitintervalls eine Minimumsstelle aufweist, an die Schalteinheit anlegt. Unter einer "Mitte" des ersten Zeitintervalls soll insbesondere ein Zeitpunkt verstanden werden, der von einem Ende und einem Anfang des Zeitintervalls einen gleichen zeitlichen Abstand besitzt. Unter einer "Minimumsstelle" der Spannung soll insbesondere ein Zeitpunkt verstanden werden, an welchem die Spannung ein Minimum aufweist. Unter einem "Minimum" der zeitabhängigen Spannung soll insbesondere ein Spannungswert der Spannung zu einem bestimmten Zeitpunkt verstanden werden, welcher innerhalb eines Zeitintervalls liegt, in welchem die Spannung nur Werte annimmt, welche größer oder gleich groß sind wie der Spannungswert, wobei sich der Zeitpunkt von einem Anfangspunkt und einem Endpunkt des letztgenannten Zeitintervalls unterscheidet. Darunter, dass die Spannung "im Wesentlichen" in der Mitte des ersten Zeitintervalls eine Minimumsstelle aufweist, soll insbesondere verstanden werden, dass die Minimumsstelle höchstens 25 Prozent, vorzugsweise höchstens 10 Prozent und besonders bevorzugt höchstens 2 Prozent einer Gesamtdauer des Zeitintervalls von der Mitte beabstandet ist. Hierdurch kann eine komfortable Benutzbarkeit der Kochmuldenvorrichtung erreicht werden. Insbesondere kann eine gleichmäßige Belastung des Stromnetzes bei einem Betrieb der Kochmuldenvorrichtung erreicht werden.It is also proposed that the cooktop device has at least one voltage supply unit which, during the operating process, applies a time-dependent voltage, which has a minimum point essentially at a middle of the first time interval, to the switching unit. A "middle" of the first time interval is to be understood in particular as meaning a time which has the same time interval from one end to the beginning of the time interval. A "minimum point" of the voltage should in particular be understood as a point in time at which the voltage has a minimum. A "minimum" of the time-dependent voltage is understood in particular to be a voltage value of the voltage at a specific time, which lies within a time interval in which the voltage only assumes values which are greater than or equal to the voltage value, the time being from a start point and an end point of the latter time interval. By the fact that the voltage "essentially" has a minimum point in the middle of the first time interval, it should be understood in particular that the minimum point is at most 25 percent, preferably at most 10 percent and more preferably at most 2 percent of a total duration of the time interval from the center , In this way, a comfortable usability of the cooktop device can be achieved. In particular, a uniform load on the power grid can be achieved during operation of the hob device.

Vorzugsweise ist das erste Zeitintervall wenigstens zwei Millisekunden groß. Dadurch kann zuverlässig ein schonendes Schalten während des ersten Zeitintervalls erreicht werden. Insbesondere kann erreicht werden, dass ein Schaltvorgang des Schaltelements zuverlässig innerhalb des ersten Zeitintervalls anfängt und endet.Preferably, the first time interval is at least two milliseconds. As a result, a gentle switching during the first time interval can be reliably achieved. In particular, it can be achieved that a switching operation of the switching element reliably begins and ends within the first time interval.

Mit Vorteil ist das erste Zeitintervall wenigstens vier Millisekunden groß. Damit kann besonders zuverlässig ein schonendes Schalten erreicht werden. Insbesondere können Abweichungen einer Reaktionszeit des Schaltelements von einer Ansteuerung bis zu einem Beginn eines Schaltvorgangs von einer Soll-Reaktionszeit kompensiert werden.Advantageously, the first time interval is at least four milliseconds in size. Thus, a gentle switching can be achieved particularly reliable. In particular, deviations a reaction time of the switching element from a control to a start of a switching operation of a target reaction time can be compensated.

Außerdem wird vorgeschlagen, dass die Steuervorrichtung bei dem Betriebsvorgang die Schalteinheit dazu veranlasst, die Stromzuleitung periodisch jeweils für wenigstens eine gesamte Zeitspanne, welche im Wesentlichen gleich lang ist wie das erste Zeitintervall, zu unterbrechen. Unter einer Zeitpanne, welche "im Wesentlichen" gleich lang ist wie das erste Zeitintervall, soll insbesondere eine Zeitspanne verstanden werden, deren Länge um höchstens vierzig Prozent, vorzugsweise um höchsten zehn Prozent und besonders bevorzugt um höchstens zwei Prozent von einer Länge des ersten Zeitintervalls abweicht. Hierdurch kann eine effiziente Bauweise erreicht werden. Insbesondere kann erreicht werden, dass ein einziger Wechselrichter bei einem Betriebsvorgang, bei welchem zwei verschiedene Heizelemente zur Durchführung zweier verschiedener Kochvorgänge betrieben werden, Strom zu beiden Heizelementen weiterleitet.In addition, it is proposed that the control device causes the switching unit in the operating process to interrupt the power supply periodically for at least a total period of time, which is substantially the same as the first time interval. A time span which is "substantially" the same as the first time interval should be understood to mean, in particular, a time period whose length deviates from a length of the first time interval by at most forty percent, preferably by at most ten percent and particularly preferably by at most two percent , As a result, an efficient construction can be achieved. In particular, it can be achieved that a single inverter in an operating operation in which two different heating elements are operated to carry out two different cooking operations, passes electricity to both heating elements.

Ferner wird vorgeschlagen, dass die Kochmuldenvorrichtung das erste und wenigstens ein zweites Schaltelement aufweist, welches seriell zu dem ersten Schaltelement geschaltet ist, und die Steuervorrichtung das zweite Schaltelement in einem zweiten Zeitintervall schaltet und die Steuervorrichtung während des gesamten zweiten Zeitintervalls die Stromzuleitung mittels der Schalteinheit unterbricht und die Steuervorrichtung mittels der Schalteinheit veranlasst, dass unmittelbar vor und unmittelbar nach dem zweiten Zeitintervall Strom durch die Stromzuleitung fließt. Darunter, dass die Steuervorrichtung das zweite Schaltelement "in einem zweiten Zeitintervall schaltet", soll insbesondere verstanden werden, dass die Steuervorrichtung ein Schalten des zweiten Schaltelements veranlasst, welches während des zweiten Zeitintervalls beginnt und endet. Hierdurch kann eine hohe Lebensdauer des zweiten Schaltelements erreicht werden.It is also proposed that the cooktop device has the first and at least one second switching element, which is connected in series with the first switching element, and the control device switches the second switching element in a second time interval and the control device interrupts the power supply line by means of the switching unit during the entire second time interval and the control device, by means of the switching unit, causes current to flow through the power supply line immediately before and immediately after the second time interval. By the fact that the control device switches the second switching element "in a second time interval" should be understood in particular that the control device causes a switching of the second switching element, which begins and ends during the second time interval. As a result, a long service life of the second switching element can be achieved.

Weiterhin wird vorgeschlagen, dass die Steuervorrichtung die Schalteinheit in einem ersten Zeitabschnitt, welcher dem ersten Zeitintervall unmittelbar vorangeht, mit einem ersten Satz von Schaltparametern schaltet und die Steuervorrichtung die Schalteinheit in einem zweiten Zeitabschnitt, welcher unmittelbar auf das erste Zeitintervall folgt, mit einem zweiten Satz von Schaltparametern schaltet, welcher sich von dem ersten Satz von Schaltparametern unterscheidet. Darunter, dass die Steuervorrichtung die Schalteinheit in einem zweiten Zeitabschnitt mit einem zweiten Satz von Schaltparametern schaltet, welcher sich von dem ersten Satz von Schaltparametern "unterscheidet", mit welchem die Steuervorrichtung die Schalteinheit in dem ersten Zeitabschnitt schaltet, soll insbesondere verstanden werden, dass eine Schaltfrequenz der Schalteinheit in den beiden Zeitabschnitten verschieden ist oder, falls die Schaltfrequenzen gleich sind, dass die Schalteinheit in einer Periodendauer in dem ersten Zeitabschnitt bei einem bestimmten Bruchteil der Periodendauer schaltet und die Schalteinheit in einer Periodendauer in dem zweiten Zeitabschnitt zum Zeitpunkt des Bruchteils der Periodendauer inaktiv ist. Hierdurch kann eine hohe Flexibilität erreicht werden. Insbesondere kann erreicht werden, dass eine an verschiedene Heizelemente nacheinander abgegebene Leistung im Wesentlichen gleich ist, wodurch insbesondere das Stromnetz gleichmäßig belastet wird.Furthermore, it is proposed that the control device switch the switching unit in a first time period, which immediately precedes the first time interval, with a first set of switching parameters, and the control device switches the switching unit in a second time interval, which immediately follows the first time interval, with a second set of switching parameters, which is different from the first set of switching parameters. By that the control device switches the switching unit in a second time period with a second set of switching parameters, which is from the first set of switching parameters with which the control device switches the switching unit in the first period, it should be understood in particular that a switching frequency of the switching unit is different in the two time periods or, if the switching frequencies are the same, that the switching unit in a period in the first period at a certain fraction of the period switches and the switching unit is inactive in a period in the second period at the time of the fraction of the period. This allows a high degree of flexibility can be achieved. In particular, it can be achieved that a power delivered to different heating elements in succession is substantially the same, as a result of which, in particular, the power supply is uniformly loaded.

Vorzugsweise weist die Schalteinheit wenigstens zwei Wechselrichter auf, welche dazu vorgesehen sind, einen Stromfluss durch das erste Schaltelement zu beeinflussen. Dadurch kann eine hohe Flexibilität erreicht werden.Preferably, the switching unit has at least two inverters, which are provided to influence a current flow through the first switching element. This allows a high degree of flexibility can be achieved.

Mit Vorteil ist das erste Schaltelement ein Relais, welches wenigstens eine Spule aufweist. Hierdurch kann eine kostengünstige Bauweise erreicht werden.Advantageously, the first switching element is a relay which has at least one coil. This allows a cost-effective design can be achieved.

Ferner wird vorgeschlagen, dass die Schalteinheit wenigstens einen Bipolartransistor mit isolierter Gate-Elektrode aufweist. Dadurch kann eine effiziente Leistungssteuerung erreicht werden.It is also proposed that the switching unit has at least one insulated gate bipolar transistor. Thereby, an efficient power control can be achieved.

Außerdem wird eine Kochmulde mit einer Kochmuldenvorrichtung vorgeschlagen, wodurch eine hohe Effizienz erreicht werden kann.In addition, a cooktop is proposed with a Kochmuldenvorrichtung, whereby a high efficiency can be achieved.

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbereibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination.Further advantages result from the following subscription. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination.

Es zeigen:

Fig. 1
eine Draufsicht auf eine Kochmulde mit einer erfindungsgemäßen Kochmuldenvorrichtung,
Fig. 2a
eine Schaltung der Kochmuldenvorrichtung in einem ersten Zustand,
Fig. 2b
die Schaltung der Kochmuldenvorrichtung in einem zweiten Zustand,
Fig. 3
eine schematische Darstellung eines Schaltvorgangs, wobei auf einer Abszisse die Zeit aufgetragen ist,
Fig. 4
eine Darstellung einer Periodendauer und
Fig. 5
die Schaltung in einem dritten Zustand.
Show it:
Fig. 1
a top view of a cooking hob with a hob according to the invention,
Fig. 2a
a circuit of the cooktop device in a first state,
Fig. 2b
the circuit of the hob device in a second state,
Fig. 3
1 is a schematic representation of a switching process, the time being plotted on an abscissa,
Fig. 4
a representation of a period and
Fig. 5
the circuit in a third state.

Figur 1 zeigt eine Draufsicht auf eine Kochmulde mit einer erfindungsgemäßen, als Induktionskochmuldenvorrichtung ausgebildeten Kochmuldenvorrichtung, welche mehrere Kochzonen 34 aufweist. Eine Schaltung 36 (Figur 2a) der Kochmuldenvorrichtung weist vier als Spulen ausgebildete Heizelemente L1, L2, L3, L4 auf, welche alle gleichzeitig auf unterschiedlichen Leistungsstufen betreibbar sind. Jedem der Heizelemente L1, L2, L3, L4 ist eine der Kochzonen 34 zugeordnet, so dass bei einer Benutzung der Kochmulde jedes Heizelement L1 genau ein Kochgeschirrelement, also z. B. einen Topf oder eine Pfanne, erhitzt. Die Schaltung 36 weist eine Schalteinheit 10 auf, welche durch einen ersten und einen zweiten Wechselrichter 28, 30 gebildet ist. Der erste Wechselrichter 28 weist einen ersten Bipolartransistor mit isolierter Gate-Elektrode (hierfür wird im Folgenden die Abkürzung "IGBT" verwendet) 32 und einen zweiten IGBT 33 auf. Ferner weist der Wechselrichter 30 einen ersten IGBT 44 und einen zweiten IGBT 46 auf. FIG. 1 shows a plan view of a cooking hob with a cooking hob device according to the invention, designed as an induction cooker device, which has a plurality of cooking zones 34. A circuit 36 ( FIG. 2a ) of the cooktop device has four coils formed as heating elements L 1 , L 2 , L 3 , L 4 , which are all simultaneously operated at different power levels. Each of the heating elements L 1 , L 2 , L 3 , L 4 is associated with one of the cooking zones 34, so that when using the cooktop each heating element L 1 exactly one cookware element, ie z. As a pot or pan, heated. The circuit 36 has a switching unit 10, which is formed by a first and a second inverter 28, 30. The first inverter 28 includes a first insulated gate bipolar transistor (hereinafter, the abbreviation "IGBT" is used) 32 and a second IGBT 33. In addition, the inverter 30 has a first IGBT 44 and a second IGBT 46.

Des Weiteren weist die Schaltung 36 eine länderspezifische Wechselstromspannungsquelle U auf, welche eine Stromnetzspannung mit einem Effektivwert von 230 V und einer Frequenz von 50 Hz liefert. Die beschriebene Kochmuldenvorrichtung ist insbesondere zu einem Betrieb in Europe vorgesehen. Für Kochmuldenvorrichtungen, welche zu einem Betrieb in den USA vorgesehen sind, liefert eine entsprechende Wechselstromspannungsquelle eine Stromnetzspannung mit 60 Hz. Die Spannung der Wechselstromspannungsquelle U durchläuft zunächst einen Filter 40 der Schaltung 36, der hochfrequentes Rauschen eliminiert und im Wesentlichen ein Tiefpass-Filter ist. Eine von dem Filter 40 gefilterte Spannung wird von einem Gleichrichter 42 der Schaltung 36, welcher als Brückengleichrichter ausgebildet sein kann, gleichgerichtet, so dass an einem Ausgang des Gleichrichters 42 eine gleichgerichtete Spannung Ug (Figur 3) abgegeben wird, die zwischen einem Kollektor des IGBTs 32 und einem Emitter des IGBTs 33 anliegt. Die gleichgerichtete Spannung Ug liegt ferner zwischen einem Kollektor des IGBTs 44 und an einem Emitter des IGBTs 46 an. Des Weiteren weist die Schaltung 36 zwei Kondensatoren C1, C2 auf. Jeweils ein erster Kontakt der Kondensatoren C1, C2 ist leitend mit dem Kollektor des IGBTs 32 und leitend mit einem Kollektor des IGBTs 44 verbunden. Ferner ist jeweils ein zweiter Kontakt der Kondensatoren C1, C2 leitend mit dem Emitter des IGBTs 33 und leitend mit dem Emitter des IGBTs 46 verbunden. Ein Emitter des IGBTs 32 ist leitend mit einem Kollektor des IGBTs 33 verbunden. Außerdem ist ein Emitter des IGBTs 44 leitend mit einem Kollektor des IGBTs 46 verbunden.Furthermore, the circuit 36 has a country-specific AC voltage source U, which supplies a mains voltage with an effective value of 230 V and a frequency of 50 Hz. The cooking hob device described is intended in particular for operation in Europe. For cooktop appliances intended for US operation, a corresponding AC power source provides a 60 Hz power line voltage. The voltage of AC power source U first passes through a filter 40 of circuit 36, which eliminates high frequency noise and is essentially a low pass filter. A voltage filtered by the filter 40 is rectified by a rectifier 42 of the circuit 36, which may be designed as a bridge rectifier, so that at a output of the rectifier 42 is a rectified voltage U g ( FIG. FIG. 3 ) which is applied between a collector of the IGBT 32 and an emitter of the IGBT 33. The rectified voltage U g is further to between a collector of the IGBT 44, and at an emitter of the IGBT 46th Furthermore, the circuit 36 has two capacitors C 1 , C 2 . In each case, a first contact of the capacitors C 1 , C 2 is conductively connected to the collector of the IGBT 32 and conductively connected to a collector of the IGBT 44. Furthermore, in each case a second contact of the capacitors C 1 , C 2 is conductively connected to the emitter of the IGBT 33 and conductively connected to the emitter of the IGBT 46. An emitter of the IGBT 32 is conductively connected to a collector of the IGBT 33. In addition, an emitter of the IGBT 44 is conductively connected to a collector of the IGBT 46.

Des Weiteren weist die Schaltung 36 ein als Relais S1' ausgebildetes Schaltelement S1 und fünf weitere Relais S2, S3, S4, S5, S6 auf. Die Relais S1', S2, S3, S4, S5, S6 sind SPDT-Relais und baugleich. Jedes der Relais S1', S2, S3, S4, S5, S6 weist einen ersten, einen zweiten und einen dritten Kontakt und eine Spule auf, wobei der erste Kontakte durch eine entsprechende Ansteuerung der Spule wahlweise mit dem zweiten oder dem dritten Kontakt leitend verbindbar ist.Furthermore, the circuit 36 as a relay S 1 'trained switching element S 1 and five other relays S 2 , S 3 , S 4 , S 5 , S 6 on. The relays S 1 ', S 2 , S 3 , S 4 , S 5 , S 6 are SPDT relay and identical. Each of the relays S 1 ', S 2 , S 3 , S 4 , S 5 , S 6 has a first, a second and a third contact and a coil, wherein the first contacts by a corresponding control of the coil optionally with the second or the third contact is conductively connected.

Der erste Kontakt des Relais S3 ist leitend mit dem Emitter des IGBTs 32 verbunden. Ferner ist der zweite Kontakt des Relais S3 mit dem ersten Kontakt des Relais S1' verbunden. Der dritte Kontakt des Relais S3 ist leitend mit dem ersten Kontakt des Relais S2 verbunden. Der zweite Kontakt des Relais S1' ist leitend mit einem ersten Kontakt des Heizelements L1 verbunden. Der dritte Kontakt des Relais S1' ist leitend mit einem ersten Kontakt des Heizelements L2 verbunden. Der zweite Kontakt des Relais S2 ist leitend mit einem ersten Kontakt des Heizelements L3 verbunden. Der dritte Kontakt des Relais S2 ist leitend mit einem ersten Kontakt des Heizelements L4 verbunden.The first contact of the relay S 3 is conductively connected to the emitter of the IGBT 32. Further, the second contact of the relay S 3 is connected to the first contact of the relay S 1 '. The third contact of the relay S 3 is conductively connected to the first contact of the relay S 2 . The second contact of the relay S 1 'is conductively connected to a first contact of the heating element L 1 . The third contact of the relay S 1 'is conductively connected to a first contact of the heating element L 2 . The second contact of the relay S 2 is conducting with a first contact of the heating element L 3 connected. The third contact of the relay S 2 is conductively connected to a first contact of the heating element L 4 .

Außerdem ist der erste Kontakt des Relais S6 leitend mit dem Emitter des IGBTs 44 verbunden. Ferner ist der zweite Kontakt des Relais S6 mit dem ersten Kontakt des Relais S4 verbunden. Der dritte Kontakt des Relais S6 ist leitend mit dem ersten Kontakt des Relais S5 verbunden. Der zweite Kontakt des Relais S4 ist leitend mit einem ersten Kontakt des Heizelements L1 verbunden. Der dritte Kontakt des Relais S4 ist leitend mit einem ersten Kontakt des Heizelements L2 verbunden. Der zweite Kontakt des Relais S5 ist leitend mit einem ersten Kontakt des Heizelements L3 verbunden. Der dritte Kontakt des Relais S5 ist leitend mit einem ersten Kontakt des Heizelements L4 verbunden.In addition, the first contact of the relay S 6 is conductively connected to the emitter of the IGBT 44. Further, the second contact of the relay S 6 is connected to the first contact of the relay S 4 . The third contact of the relay S 6 is conductively connected to the first contact of the relay S 5 . The second contact of the relay S 4 is conductively connected to a first contact of the heating element L 1 . The third contact of the relay S 4 is conductively connected to a first contact of the heating element L 2 . The second contact of the relay S 5 is conductively connected to a first contact of the heating element L 3 . The third contact of the relay S 5 is conductively connected to a first contact of the heating element L 4 .

Ein zweiter Kontakt des Heizelements L1 ist leitend mit einem zweiten Kontakt des Heizelements L2 verbunden. Ferner ist ein zweiter Kontakt des Heizelements L3 leitend mit einem zweiten Kontakt des Heizelements L4 verbunden. Die Schaltung 36 weist ferner Kondensatoren C3, C4, C5, C6 auf. Der zweite Kontakt des Heizelements L1 ist leitend mit einem ersten Kontakt des Kondensators C3 und mit einem ersten Kontakt des Kondensators C4 verbunden. Der zweite Kontakt des Heizelements L3 ist leitend mit einem ersten Kontakt des Kondensators C5 und mit einem ersten Kontakt des Kondensators C6 verbunden. Zweite Kontakte der Kondensatoren C3 und C5 sind leitend mit dem Kollektor des IGBTs 32 verbunden. Ferner sind zweite Kontakte der Kondensatoren C4 und C6 leitend mit dem Emitter des IGBTs 46 verbunden.A second contact of the heating element L 1 is conductively connected to a second contact of the heating element L 2 . Further, a second contact of the heating element L 3 is conductively connected to a second contact of the heating element L 4 . The circuit 36 also has capacitors C 3 , C 4 , C 5 , C 6 . The second contact of the heating element L 1 is conductively connected to a first contact of the capacitor C 3 and to a first contact of the capacitor C 4 . The second contact of the heating element L 3 is conductive to a first contact of the capacitor C5 and connected to a first contact of the capacitor C. 6 Second contacts of the capacitors C 3 and C 5 are conductively connected to the collector of the IGBT 32. Further, second contacts of the capacitors C 4 and C 6 are conductively connected to the emitter of the IGBT 46.

Sowohl mittels des IGBTs 32 als auch mittels des IGBTs 33 ist jeweils eine Stromzuleitung zu dem ersten Schaltelement S1, durch welche bei einem Betriebsvorgang ein mittels der Wechselstromspannungsquelle U generierter Strom fließt, herstellbar und unterbrechbar.Both by means of the IGBT 32 and by means of the IGBT 33 is in each case a power supply to the first switching element S 1 , through which in an operating process, a generated by means of the AC voltage source U current flows, producible and interruptible.

Eine Steuervorrichtung 14 der Schaltung 36, welche zwei Steuereinheiten 56, 58 aufweist, steuert während des Betriebsvorgangs die Schalteinheit 10, und zwar derart, dass während eines gesamten Zeitintervalls t (Figur 3) für jeden einzelnen der IGBTs 32, 33, 44, 46 gilt, dass eine leitende Verbindung zwischen seinem Kollektor und seinem Emitter unterbrochen ist. Hierzu ist die Steuervorrichtung 14 mit der Schalteinheit 10 und insbesondere mit den Gate-Anschlüssen der IGBTs 32, 33, 44, 46 verbunden (nicht dargestellt). Unmittelbar vor und unmittelbar nach dem Zeitintervall t ist wenigstens einer der IGBTs 32, 33 und wenigstens einer der IGBTs 44, 46 in einem Zustand, in welchem sein Kollektor mit seinem Emitter leitend verbunden ist. Prinzipiell ist auch denkbar, dass die Steuervorrichtung 14 veranlasst, dass während des gesamten Zeitintervalls t nur für jeden der IGBTs 32, 33 gilt, dass eine leitende Verbindung zwischen seinem Kollektor und seinem Emitter unterbrochen ist, während die IGBTs 44, 46 beispielsweise in dem Zeitintervall t Schaltvorgänge durchführen können.A control device 14 of the circuit 36, which has two control units 56, 58, controls the switching unit 10 during the operating process, such that during a total time interval t (FIG. FIG. 3 ) for each one of the IGBTs 32, 33, 44, 46 is that a conductive connection between its collector and its emitter is interrupted. For this purpose, the control device 14 is connected to the switching unit 10 and in particular to the gate terminals of the IGBTs 32, 33, 44, 46 (not shown). Immediately before and immediately after the time interval t is at least one of the IGBTs 32, 33 and at least one of the IGBTs 44, 46 in a state in which its collector is conductively connected to its emitter. In principle, it is also conceivable that the control device 14 causes, during the entire time interval t only for each of the IGBTs 32, 33, that a conductive connection between its collector and its emitter is interrupted, while the IGBTs 44, 46, for example, in the time interval t can perform switching operations.

Zunächst sind die Relais S2, S3, S4, S5 und S6 bei dem Betriebsvorgang in den folgenden Schaltzuständen: Bei den Relais S2, S3, S4, S5 ist jeweils der erste Kontakt mit dem zweiten Kontakt leitende verbunden. Bei dem Relais S6 ist der erste mit dem dritten Kontakt leitend verbunden.First, the relays S 2 , S 3 , S 4 , S 5 and S 6 in the operating process in the following switching states: In the relay S 2 , S 3 , S 4 , S 5 each of the first contact with the second contact is conductive connected. In the relay S 6 , the first is conductively connected to the third contact.

In Figur 3 ist schematisch eine Bewerkstelligung eines Schaltvorgangs des Relais S1' veranschaulicht, wobei auf einer Abszisse 52 die Zeit dargestellt ist. Eine Schaltstellung 54 des Relais S1', also eine Stellung des ersten Kontakts des Relais S1', ist gestrichelt dargestellt. Zeitlich vor dem Zeitintervall t ist das erste Relais S1' in einem ersten Schaltzustand, in welchem der erste Kontakt des Relais S1' mit dem zweiten Kontakt des Relais S1' eine leitende Verbindung bildet. Während des Zeitintervalls t ist die leitende Verbindung frei von einem Stromdurchfluss.In FIG. 3 schematically a Bewerkigung a switching operation of the relay S 1 'is illustrated, wherein on an abscissa 52, the time is shown. A switching position 54 of the relay S 1 ', that is, a position of the first contact of the relay S 1 ' is shown in dashed lines. Temporally before the time interval t, the first relay S 1 'in a first switching state, in which the first contact of the relay S 1 ' with the second contact of the relay S 1 'forms a conductive connection. During the time interval t, the conductive connection is free of current flow.

Die Steuervorrichtung 14 veranlasst, dass während einer Zeitspanne t2, welche vollständig innerhalb des Zeitintervalls t liegt und welche von Endpunkten des Zeitintervalls t beabstandet ist, ausgehend von dem ersten Schaltzustand (Figur 2a) sich die leitende Verbindung löst, der erste Kontakt des Relais S1' schließlich getrennt von dem zweiten Kontakt des Relais S1' ist und nachfolgend auf den dritten Kontakt aufprallt und nach dem Aufprallen der erste und der dritte Kontakt des Relais S1' eine leitende Verbindung bilden, wobei diese leitende Verbindung vor einem Ende des Zeitintervalls t besteht (Figur 2b) und während des Zeitintervalls t frei von einem Stromdurchfluss ist. Dazu legt die Steuervorrichtung 14 zu einem Zeitpunkt, welcher von einer Mitte der Zeitspanne t2 einen zeitlichen Abstand t1 besitzt, der eine Reaktionszeit des Relais S1' charakterisiert, eine Spannung Us an die Spule des Relais S1' an, welche ein Schalten des Relais S1' in der Zeitspanne t2 verursacht. Das Lösen der leitenden Verbindung zwischen dem ersten und dem zweiten Kontakt des Relais S1' beginnt mit einem Anfangszeitpunkt der Zeitspanne t2. Eine Herstellung der leitenden Verbindung zwischen dem ersten und dem dritten Kontakt des Relais S1' endet an einem Endzeitpunkt der Zeitspanne t2. Aufgrund einer Abweichung einer konkreten Ausbildung des Relais von einer Soll-Ausbildung kann der Abstand t1 um eine maximale Abweichzeit abweichen. Eine Gesamtdauer des Zeitintervalls t ist die Summe der Zeitspanne t2 und dem zweifachen des Betrags der Abweichzeit. Weil die leitenden Verbindungen des Relais S1' während des Zeitintervalls t stromlos sind, ist der Schaltvorgang des Relais S1', der während des Zeitintervalls t stattfindet, besonders schonend für das Relais S1' und erlaubt eine hohe Lebensdauer des Relais S1'. Prinzipiell ist denkbar, dass während des Zeitintervalls t außer dem Relais S1' ein weiteres der Relais S2, S3, S4, S5, S6 einen Schaltvorgang durchführt, der während des Zeitintervalls t beginnt und endet.The control device 14 causes, during a time period t 2 , which is completely within the time interval t and which is spaced from end points of the time interval t, starting from the first switching state (FIG. FIG. 2a ) solves the conductive connection, the first contact of the relay S 1 'is finally separated from the second contact of the relay S 1 ' and subsequently impinges on the third contact and after the impact of the first and the third contact of the relay S 1 'a form a conductive connection, this conductive connection existing before one end of the time interval t ( FIG. 2b ) and during the time interval t is free from a current flow. For this purpose, the control device 14 applies a voltage U s to the coil of the relay S 1 'at a time which has a time interval t 1 from a middle of the time interval t 2 , which characterizes a reaction time of the relay S 1 ' Switching the relay S 1 'caused in the period t 2 . The release of the conductive connection between the first and the second contact of the relay S 1 'begins with an initial time of the time t 2 . A production of the conductive connection between the first and the third contact of the relay S 1 'ends at an end time of the time period t 2 . Due to a deviation a specific design of the relay of a desired training, the distance t 1 may differ by a maximum deviation time. A total duration of the time interval t is the sum of the time period t 2 and twice the amount of the deviation time. Because the conductive connections of the relay S 1 'during the time interval t are de-energized, the switching operation of the relay S 1 ', which takes place during the time interval t, particularly gentle for the relay S 1 'and allows a long life of the relay S 1 ' , In principle, it is conceivable that during the time interval t apart from the relay S 1 'another of the relay S 2, S 3, S 4, S 5, S 6 performs a switching operation, which begins during the time interval t and ends.

Die Stromnetzspannung weist eine Frequenz von 50 Hz auf. Das Zeitintervall t ist kleiner als eine halbe Periodendauer der Stromnetzspannung und weist eine Länge von acht Millisekunden auf.The mains voltage has a frequency of 50 Hz. The time interval t is less than half the period of the mains voltage and has a length of eight milliseconds.

Die Wechselstromspannungsquelle U, der Filter 40 und der Gleichrichter 42 bilden eine Spannungsversorgungseinheit 18, die bei dem Betriebsvorgang die Spannung Ug an die Schalteinheit 10 anlegt. Die Spannung Ug weist in einer Mitte des Zeitintervalls t eine Minimumsstelle auf. Ferner weist eine von der Wechselstromspannungsquelle U abgegebene Spannung in der Mitte des Zeitintervalls t einen Nulldurchgang auf.The AC voltage source U, the filter 40 and the rectifier 42 form a voltage supply unit 18, which applies the voltage U g to the switching unit 10 during the operating process. The voltage U g has a minimum point in a middle of the time interval t. Furthermore, a voltage delivered by the AC voltage source U has a zero crossing in the middle of the time interval t.

Während des Zeitintervalls t sorgen die Kondensatoren C1 und C2 und die Inaktivität der Wechselrichter 28, 30 dafür, dass die Spannung Ug konstant ist.During the time interval t, the capacitors C 1 and C 2 and the inactivity of the inverters 28, 30 ensure that the voltage U g is constant.

Die Steuervorrichtung 14 veranlasst die Schalteinheit 10 bei dem Betriebsvorgang dazu, periodisch für Zeitspannen t3, die so lang sind wie das Zeitintervall t, sämtliche Stromzuleitungen, welche mittels der Schalteinheit 10 herstellbar und unterbrechbar sind, zu unterbrechen. Eine Periodendauer TMux des periodischen Unterbrechens ist kleiner als eine Sekunde (Figur 4). Die Periodendauer TMux beginnt mit einer der Zeitspannen t3, an welche sich unmittelbar ein erster Zeitabschnitt TS1 anschließt. Während der Zeitspanne t3 beginnt und endet ein Schaltvorgang des Schaltelements S1, welcher das Schaltelement S1 von einem Zustand, in dem der erste und der dritte Kontakt des Schaltelements S1 leitend verbunden sind, in einen Zustand, in dem der erste und der zweite Kontakt des Schaltelements S1 leitend verbunden sind, überführt. Die Steuervorrichtung 14 veranlasst, dass während des Zeitabschnitts TS1 jeder einzelne der IGBTs 32, 33 mit einer ersten Frequenz schaltet. An den Zeitabschnitt TS1 schließt sich eine der Zeitspannen t3, welche mit dem Zeitintervall t identisch ist, unmittelbar an. An das Zeitintervall t schließt sich unmittelbar ein Zeitabschnitt TS2 an. Die Steuervorrichtung 14 veranlasst, dass während des Zeitabschnitts TS2 jeder einzelne der IGBTs 32, 33 mit einer zweiten Frequenz, die sich von der ersten Frequenz unterscheidet, schaltet. Während des Zeitabschnitts TS1 wird mittels des ersten Wechselrichters 28 eine Leistung an das Heizelement L1 abgegeben (Figur 2a), welche etwa derjenigen Leistung entspricht, die während des zweiten Zeitabschnitts TS2 mittels des Wechselrichters 30 an das Heizelement L2 (Figur 2b) abgegeben wird. Dadurch kann eine gleichmäßige Belastung des Stromnetzes erreicht werden. Längen der Zeitabschnitte TS1, TS2 werden entsprechend den Leistungsstufen, auf denen jedes einzelne Heizelement L1, L2 betrieben werden soll, von der Steuervorrichtung 14 eingestellt, wobei die Leistungsstufen der Heizelemente L1, L2 sich unterscheiden können und die Heizelemente L1, L2 unterschiedliche Kochgeschirrelemente erhitzen. Der Wechselrichter 30 versorgt während der Zeitabschnitte TS1, TS2 das Heizelement L3 mit Leistung. Die Spannung Ug ist in Bereichen, die frei von allen Zeitintervallen t3 sind, periodisch mit einer Periodendauer, die halb so groß ist wie die Periodendauer der Stromnetzspannung.The control device 14 causes the switching unit 10 during the operation to interrupt periodically for periods of time t 3 , which are as long as the time interval t, all power supply lines which can be produced and interrupted by the switching unit 10. A period T Mux of the periodic interruption is less than one second ( FIG. 4 ). The period T Mux begins with one of the time periods t 3 , which is followed immediately by a first time period T S1 . During the period t 3 , a switching operation of the switching element S 1 starts and ends, which switches the switching element S 1 from a state in which the first and third contacts of the switching element S 1 are conductively connected to a state in which the first and the second contact of the switching element S 1 are conductively connected, transferred. The controller 14 causes each of the IGBTs 32, 33 to switch at a first frequency during the time period T S1 . The time period T S1 is followed by one of the time periods t 3 , which is identical to the time interval t, immediately on. The time interval t is followed immediately by a time interval T S2 . The controller 14 causes each of the IGBTs 32, 33 to switch at a second frequency different from the first frequency during the time period T S2 . During the period T S1 , a power is delivered to the heating element L 1 by means of the first inverter 28 (FIG. FIG. 2a ), which corresponds approximately to the power which during the second time period T S2 by means of the inverter 30 to the heating element L 2 ( FIG. 2b ) is delivered. As a result, a uniform load of the power grid can be achieved. Lengths of the time segments T S1 , T S2 are set by the control device 14 according to the power levels at which each individual heating element L 1 , L 2 is to be operated, wherein the power levels of the heating elements L 1 , L 2 may differ and the heating elements L 1 , L 2 heat different cookware elements. The inverter 30 supplies the heating element L 3 with power during the periods T S1 , T S2 . The voltage U g is in periods that are free of all time intervals t 3 , periodically with a period that is half as large as the period of the power grid voltage.

Das Relais S3 ist ein Schaltelement S3', welches seriell zu dem Schaltelement S1 geschaltet ist. Die Steuervorrichtung 14 schaltet das Relais S3 bei einem sich von dem Betriebsvorgang unterscheidenden weiteren Betriebsvorgang in einem zweiten Zeitintervall, welches sieben Millisekunden lang ist (Figur 5). Das Schalten des Relais S3 beginnt und endet in dem zweiten Zeitintervall. Die Steuervorrichtung 14 veranlasst, dass jeder der IGBTs 32, 33, 44, 46 während des gesamten zweiten Zeitintervalls in einem Sperrzustand, also frei von einer leitenden Verbindung zwischen seinem Kollektor und seinem Emitter ist. Unmittelbar vor und unmittelbar nach dem zweiten Zeitintervall schaltet wenigsten einer der IGBTs 32, 33 und wenigstens einer der IGBTs 44, 46. Unmittelbar vor und unmittelbar nach dem zweiten Zeitintervall werden alle IGBTs 32, 33, 44, 46 periodisch von der Steuervorrichtung 14 geschaltet.The relay S 3 is a switching element S 3 ', which is connected in series with the switching element S 1 . The control device 14 switches the relay S 3 in a second time interval which differs from the operating procedure in a second time interval which is seven milliseconds long ( FIG. 5 ). The switching of the relay S 3 starts and ends in the second time interval. The control device 14 causes each of the IGBTs 32, 33, 44, 46 to be in a blocking state during the entire second time interval, that is to say free from a conductive connection between its collector and its emitter. Immediately before and immediately after the second time interval, at least one of the IGBTs 32, 33 and at least one of the IGBTs 44, 46 switches. Immediately before and immediately after the second time interval, all the IGBTs 32, 33, 44, 46 are periodically switched by the control device 14.

Prinzipiell ist denkbar, dass die Schaltung 36 weitere Relais und weitere Heizelemente aufweist, welche mittels der weiteren Relais an die Wechselrichter 28, 30 angeschlossen sind. Prinzipiell ist denkbar, dass die Relais S1', S2, S3, S4, S5, S6, welche als SPDT Relais ausgebildet sind, jeweils durch zwei SPST Relais ersetzt werden. Bezugszeichen 10 Schalteinheit C6 Kondensator 14 Steuervorrichtung S1 Schaltelement 18 Spannungsversorgungseinheit S1' Relais 28 Wechselrichter S2 Relais 30 Wechselrichter S3 Relais 32 Bipolartransistor mit isolierter Gate-Elektrode S3' Schaltelement S4 Relais 33 IGBT S5 Relais 34 Kochzone S6 Relais 36 Schaltung L1 Heizelement 40 Filter L2 Heizelement 42 Gleichrichter L3 Heizelement 44 IGBT L4 Heizelement 46 IGBT t Zeitintervall 52 Abszisse t1 Abstand 54 Schaltstellung t2 Zeitspanne 56 Steuereinheit t3 Zeitspanne 58 Steuereinheit TS1 Zeitabschnitt U Wechselstromspannungsquelle TS2 Zeitabschnitt TMux Periodendauer Ug Spannung US Spannung C1 Kondensator C2 Kondensator C3 Kondensator C4 Kondensator C5 Kondensator In principle, it is conceivable that the circuit 36 has further relays and further heating elements, which are connected by means of the further relay to the inverters 28, 30. In principle, it is conceivable that the relays S 1 ', S 2 , S 3 , S 4 , S 5 , S 6 , which are designed as SPDT relays, are each replaced by two SPST relays. reference numeral 10 switching unit C 6 capacitor 14 control device S 1 switching element 18 Power supply unit S 1 ' relay 28 inverter S 2 relay 30 inverter S 3 relay 32 Bipolar transistor with insulated gate electrode S 3 ' switching element S 4 relay 33 IGBT S 5 relay 34 cooking zone S 6 relay 36 circuit L 1 heating element 40 filter L 2 heating element 42 rectifier L 3 heating element 44 IGBT L 4 heating element 46 IGBT t time interval 52 abscissa t 1 distance 54 switch position t 2 Period of time 56 control unit t 3 Period of time 58 control unit T S1 period U AC voltage source T S2 period T Mux period U g tension U S tension C 1 capacitor C 2 capacitor C 3 capacitor C 4 capacitor C 5 capacitor

Claims (11)

  1. Cooktop apparatus, in particular an induction cooktop apparatus, having at least one switching unit (10), by means of which at least one power supply line can be interrupted and established, through which a current generated by means of a power supply voltage flows during at least one operating process and which leads to a first switching element (S1), and having at least one control apparatus (14), which controls the switching unit (10) during the operating process in such a manner that the switching unit (10) interrupts the power supply line during at least one first entire time interval (t) and which initiates the establishment of the power supply line immediately before and immediately after the first time interval (t) during the operating process and which initiates a switching of the first switching element (S1), which starts and ends during the first time interval (t), wherein the first time interval (t) is shorter than the duration of half a period of the power supply voltage,
    characterised by
    at least one voltage supply unit (18), which applies a time-dependent voltage, which is at a minimum point essentially in a centre of the first time interval (t), to the switching unit (10) during the operating process.
  2. Cooktop apparatus according to claim 1,
    characterised in that
    the first time interval (t) is at least two milliseconds long.
  3. Cooktop apparatus according to claim 2,
    characterised in that
    the first time interval (t) is at least four milliseconds long.
  4. Cooktop apparatus according to one of the preceding claims,
    characterised in that
    during the operating process the control apparatus (14) prompts the switching unit (10) to interrupt the power supply line periodically in each instance for at least one entire time span (t3), which is essentially as long as the first time interval (t).
  5. Cooktop apparatus according to claim 4,
    characterised in that
    a period (TMux) of periodic prompting is shorter than one second.
  6. Cooktop apparatus according to one of the preceding claims,
    characterised by
    the first and at least one second switching element (S1, S3'), which is connected in series with the first switching element (S1), and the control apparatus (14) switches the second switching element (S3') in a second time interval and the control apparatus (14) interrupts the power supply line by means of the switching unit (10) during the entire second time interval and the control apparatus (14) uses the switching unit (10) to initiate a flow of current through the power supply line immediately before and immediately after the second time interval.
  7. Cooktop apparatus according to one of the preceding claims,
    characterised in that
    in a first time segment (TS1), which immediately precedes the first time interval (t), the control apparatus (14) switches the switching unit (10) with a first set of switching parameters and in a second time segment (TS2), which immediately follows the first time interval (t), the control apparatus (14) switches the switching unit (10) with a second set of switching parameters, which is different from the first set of switching parameters.
  8. Cooktop apparatus according to one of the preceding claims,
    characterised in that
    the switching unit (10) has at least two inverters (28, 30), which are provided to influence a current flow through the first switching element (S1).
  9. Cooktop apparatus according to one of the preceding claims,
    characterised in that
    the first switching element (S1) is a relay (S1'), which has at least one coil.
  10. Cooktop apparatus according to one of the preceding claims,
    characterised in that
    the switching unit (10) has at least one bipolar transistor with an isolated gate electrode (32).
  11. Cooktop having a cooktop apparatus according to one of the preceding claims.
EP11720183.0A 2010-04-27 2011-04-01 Hob device Active EP2564666B1 (en)

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ES2385091B1 (en) 2013-05-28
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US10136478B2 (en) 2018-11-20
US20130043239A1 (en) 2013-02-21
ES2385091A1 (en) 2012-07-18
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PL2564666T3 (en) 2017-10-31
WO2011135470A1 (en) 2011-11-03

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