EP2380398A1 - Hob having at least one inductor, at least one inverter and a switching apparatus - Google Patents

Hob having at least one inductor, at least one inverter and a switching apparatus

Info

Publication number
EP2380398A1
EP2380398A1 EP09771545A EP09771545A EP2380398A1 EP 2380398 A1 EP2380398 A1 EP 2380398A1 EP 09771545 A EP09771545 A EP 09771545A EP 09771545 A EP09771545 A EP 09771545A EP 2380398 A1 EP2380398 A1 EP 2380398A1
Authority
EP
European Patent Office
Prior art keywords
inductor
inverter
switching device
detection circuit
switching
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.)
Granted
Application number
EP09771545A
Other languages
German (de)
French (fr)
Other versions
EP2380398B1 (en
Inventor
Pablo Jesus Hernandez Blasco
Fernando Monterde Aznar
Daniel Palacios Tomas
Ramon Peinado Adiego
Jose-Ramon Garcia Jimenez
Ignacio Garde Aranda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2380398A1 publication Critical patent/EP2380398A1/en
Application granted granted Critical
Publication of EP2380398B1 publication Critical patent/EP2380398B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the invention relates to a hob with at least one inductor, at least one inverter and a switching device according to the preamble of claim 1.
  • an induction cooktop with a plurality of inductors, one inverter per inductor, an electronic switching device and a detection circuit for detecting cookware is known.
  • the switching device opens and closes a circuit between the inductor and the inverter, so that the switching device in a first switching position establishes a connection between the inverter and the inductor and interrupts the connection between the inverter and the inductor in a second switching position.
  • a microcomputer initiates the closing of one of the switches of the switching device to connect one of the inductors during a half cycle of the heating voltage to that inverter associated with that inductor. From a voltage amplitude at a tapping point or from a decay of the voltage damping of the vibration system is determined. From a sufficient attenuation is concluded that the presence or presence of a cooking utensil element. After detection of a cookware element, the inductor is automatically put into operation.
  • the invention is therefore in particular the object of equipping a generic hob with an energy-saving pot detection device, without having to provide additional sensors.
  • the invention is particularly based on a hob with at least one inductor, at least one inverter, a switching device and a detection circuit for detecting cookware.
  • the switching device is arranged in a circuit between the inductor and the inverter, in such a way that the switching device in a first switching position establishes a connection between the inverter and the inductor and the connection between the inverter and the inductor in at least a second switching position interrupts.
  • the switching device is connected to the detection circuit in such a way that the switching device connects the inductor to the detection circuit in at least one second switching position.
  • the inductor can be linked to the detection circuit in a structurally simple manner, which can then use the inductor as an inductive sensor.
  • the detection circuit can also feed a low-voltage measuring current into the inductor, so that an energy-saving measurement in stand-by mode is possible. Thereby, an energy-saving detection mode can be made possible which, in terms of operating costs, can compete with cooktops having separate sensors.
  • the two mentioned switching positions can be supplemented by further switching positions of the switching device, which can each correspond to other functions of the hob.
  • the switching device may have switch positions in which an inductor is simultaneously connected to a plurality of inverters or an inverter simultaneously operates a plurality of inductors.
  • the switching device comprises at least one electromechanical relay with two outputs, wherein the first output is connected to the inverter and the second output is connected to the detection circuit.
  • the hob comprises a plurality of inductors, which may in particular be arranged in a grid, a grid or a matrix, the advantages of the invention are particularly significant. Again, the connections between the individual inductors with the respective inductors associated with the inverter can be opened or closed via the switching device.
  • the detection circuit with the inductor form a resonant circuit.
  • the presence or absence of the cookware can be determined depending on a resonant frequency of the resonant circuit.
  • a targeted control can be made possible if the hob comprises a control unit for reading the detection circuit and / or for switching the switching device.
  • a particularly flexible modular design can be achieved if a switch of the switching device assigned to the inductor is connected directly to the inductor.
  • the inductor may in particular comprise an inductor coil, an inductor carrier and a shielding element. These elements can be combined to form a compact inductor module, which, according to the invention, can additionally comprise the switch designed, in particular, as an electromechanical relay switch. Cables for establishing a connection to the inverter and to the detection circuit can be plugged directly into two different outputs of the inductor module or connected in another way, for example by means of a suitable multi-pin connector. The two outputs are connected to the two outputs of the switch whose input is in turn connected to the inductor.
  • FIG. 1 is a schematic representation of an induction hob with a plurality of arranged in a grid inductors, a switching device and a plurality of inverters,
  • Fig. 2 is a schematic representation of an inductor with a switching device which connects the inductor with an inverter in a first switching position and the inductor with a detection circuit in a second switching position and
  • FIG 3 shows an inductor module with an integrated switch of the switching device.
  • FIG. 1 shows a matrix-type induction hob with a large number of inductors 10 arranged in a grid.
  • the inductors 10 form a rectangular grid and can be divided into a plurality of modules, each of which is supplied by different power supply units (not shown).
  • the inductors 10 can be selectively and individually activated and deactivated, for which purpose a switching device 14 can establish or interrupt a connection between the inductors 10 and an inverter 12 assigned to the respective inductor 10.
  • the inverter 12 In a first switching position of the switching device 14, the inverter 12 is connected to the inductor 10, so that an alternating current with a frequency of a few kilohertz to a maximum of about 75 or 100 kilohertz driven by a voltage amplitude of several hundred volts through the inductors 10 flows.
  • the inductors 10 generate a strong, high-frequency magnetic field, which partially penetrates into the bottom of a cookware 18 when a cookware 18 is placed with a ferromagnetic bottom on the induction hob. Due to the changing magnetic field 18 eddy currents are generated in a ferromagnetic ground of the cookware, which eventually heat the ground.
  • FIG. 1 is a schematic diagram that does not show the actual arrangement of the inductors 10 with respect to the switching device 14 and the inverter 12.
  • the Switching device 14 may be mounted with the inverters 12 on a common board or form a structurally separate unit.
  • FIG. 2 schematically shows an arbitrary inductor 10 of the induction hob of FIG. 1 with the inverter 12 and a detection circuit 16 associated with this inductor 10.
  • the detection circuit 16 may also be mounted with the switching device 14 and / or the inverters 12 on a common circuit board be present or alternatively as a separate module.
  • the electromechanical relay 20 comprises two outputs 24, 26.
  • the first output 24 is connected to the inverter 12 and the second output 26 to the detection circuit 16.
  • the electromechanical relay 20 is designed as a "Double Pole Double Throw” relay (DPDT relay) with two work contacts connected in parallel
  • a control unit 22 reads out the detection circuit 16 and is connected via a control line 28 to the coil of an electromagnet 29 of the relay 20
  • the control unit 22 may be a microcontroller or a freely programmable arithmetic unit which, in addition to the inductors 10, the switching device 14 and the detection circuit 16, also operates further electronic components of the hob, for example a user interface with a display or the like can then be shown on the display.
  • the inductor 10 forms with the detection circuit 16 a Colpitts oscillator, in which two capacitances and the inductor 10 determine the oscillation frequency.
  • the feedback necessary for the oscillation is generated by a voltage divider between the two capacitors (not shown).
  • the detection circuit 16 is supplied with a weak alternating voltage, which generates in the corresponding inductor 10 an alternating measuring voltage of about 10 or 12 volts and leads to measuring currents of a few milliamperes.
  • the inductor 10 is used in this operating state as a probe.
  • the inductor 10 forms a resonant circuit together with two capacitors.
  • By setting up the cookware 18 is reduces the inductance of the existing of the inductor 10 and the cookware 18 total system over the inductance of the free inductor 10, whereby the Resonanzfreqenz of the resonant circuit increases by about 10%.
  • the detection circuit 16 or the control unit 22 measures the resonant frequency of this overall system and concludes from the increased resonant frequency on the presence of the cookware 18th
  • FIG. 3 shows an inductor module with the inductor 10 and the switching element of the switching device 14 in the form of a relay 20 in a conceivable embodiment of the invention.
  • the relay 20 is directly attached to a bottom of an inductor carrier 30, so that it forms an easy to handle module with the inductor 10.
  • Corresponding connection lines to the inverters 12 and / or the detection circuit 16 can be plugged directly into the outputs 24, 26 of the relay when connecting the inductor module.

Landscapes

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

Abstract

The invention relates to a hob having at least one inductor (10), at least one inverter (12), a switching apparatus (14) and a detection circuit (16) for detection of cooking utensils (18), wherein the switching apparatus (14) is arranged in a circuit between the inductor (10) and the inverter (12), such that, when the switching apparatus (14) is in a first switch position, it makes a connection between the inverter (12) and the inductor (10) and, when it is in at least one second switch position, it interrupts the connection between the inverter (12) and the inductor (10). In order to allow an energy-saving detection mode, it is proposed that the switching apparatus (14) be connected to the detection circuit (16) such that the switching apparatus (14) connects the inductor (10) to the detection circuit (16) when it is in the at least one second switch position.

Description

Kochfeld mit zumindest einem Induktor, wenigstens einem Wechselrichter und einer Schaltvorrichtung Hob with at least one inductor, at least one inverter and a switching device
Die Erfindung geht aus von einem Kochfeld mit mindestens einem Induktor, wenigstens einem Wechselrichter und einer Schaltvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a hob with at least one inductor, at least one inverter and a switching device according to the preamble of claim 1.
Aus der DE 42 08 254 A1 ist ein Induktionskochfeld mit mehreren Induktoren, jeweils einem Wechselrichter pro Induktor, einer elektronischen Schaltvorrichtung und einem De- tektionsschaltkreis zum Detektieren von Kochgeschirr bekannt. Die Schaltvorrichtung öffnet und schließt einen Stromkreis zwischen dem Induktor und dem Wechselrichter, so dass die Schaltvorrichtung in einer ersten Schaltstellung eine Verbindung zwischen dem Wechselrichter und dem Induktor herstellt und die Verbindung zwischen dem Wechselrichter und dem Induktor in einer zweiten Schaltstellung unterbricht.From DE 42 08 254 A1 an induction cooktop with a plurality of inductors, one inverter per inductor, an electronic switching device and a detection circuit for detecting cookware is known. The switching device opens and closes a circuit between the inductor and the inverter, so that the switching device in a first switching position establishes a connection between the inverter and the inductor and interrupts the connection between the inverter and the inductor in a second switching position.
Um das Kochgeschirr zu detektieren, initiiert ein Mikrocomputer das Schließen eines der Schalter der Schaltvorrichtung, um einen der Induktoren während einer Halbschwingung der Heizspannung mit demjenigen Wechselrichter zu verbinden, der diesem Induktor zugeordnet ist. Aus einer Spannungsamplitude an einem Abgreifpunkt bzw. aus einem Ab- klingen der Spannung wird eine Dämpfung des Schwingungssystems ermittelt. Aus einer ausreichenden Dämpfung wird auf die Anwesenheit bzw. auf das Vorhandensein eines Kochgeschirrelements geschlossen. Nach der Detektion eines Kochgeschirrelements wird der Induktor automatisch in Betrieb genommen.To detect the cookware, a microcomputer initiates the closing of one of the switches of the switching device to connect one of the inductors during a half cycle of the heating voltage to that inverter associated with that inductor. From a voltage amplitude at a tapping point or from a decay of the voltage damping of the vibration system is determined. From a sufficient attenuation is concluded that the presence or presence of a cooking utensil element. After detection of a cookware element, the inductor is automatically put into operation.
Das dauernde Beaufschlagen des Induktors mit einem Strom mit voller Amplitude während des Stand-by-Betriebs verbraucht im Vergleich zu Topfdetektionsvorrichtungen, die separate, mit einer schwachen Messspannung betriebene Messsensoren verwenden, viel Energie. Das Vorsehen von separaten Messsensoren ist aber gegenüber der Verwendung der Induktoren sowohl als Heizelement als auch als Sensor teuer und aufwändig.Continuously energizing the inductor with a full amplitude current during stand-by operation consumes a great deal of power as compared to pot detection devices that use separate measurement sensors operating at a low measurement voltage. The provision of separate measuring sensors but compared to the use of the inductors both as a heating element and as a sensor expensive and expensive.
Der Erfindung liegt daher insbesondere die Aufgabe zugrunde, ein gattungsgemäßes Kochfeld mit einer energiesparend arbeitenden Topfdetektionsvorrichtung auszustatten, ohne zusätzliche Sensoren vorsehen zu müssen. Die Erfindung geht insbesondere aus von einem Kochfeld mit zumindest einem Induktor, wenigstens einem Wechselrichter, einer Schaltvorrichtung und einem Detektions- schaltkreis zum Detektieren von Kochgeschirr. Die Schaltvorrichtung ist in einem Strom- kreis zwischen dem Induktor und dem Wechselrichter angeordnet, und zwar derart, dass die Schaltvorrichtung in einer ersten Schaltstellung eine Verbindung zwischen dem Wechselrichter und dem Induktor herstellt und die Verbindung zwischen dem Wechselrichter und dem Induktor in wenigstens einer zweiten Schaltstellung unterbricht.The invention is therefore in particular the object of equipping a generic hob with an energy-saving pot detection device, without having to provide additional sensors. The invention is particularly based on a hob with at least one inductor, at least one inverter, a switching device and a detection circuit for detecting cookware. The switching device is arranged in a circuit between the inductor and the inverter, in such a way that the switching device in a first switching position establishes a connection between the inverter and the inductor and the connection between the inverter and the inductor in at least a second switching position interrupts.
Es wird vorgeschlagen, dass die Schaltvorrichtung derart mit dem Detektionsschaltkreis verbunden ist, dass die Schaltvorrichtung in wenigstens einer zweiten Schaltstellung den Induktor mit dem Detektionsschaltkreis verbindet. Dadurch kann in einer konstruktiv einfachen Weise der Induktor mit dem Detektionsschaltkreis verknüpft werden, die den Induktor dann als induktiven Sensor nutzen kann. Der Detektionsschaltkreis kann insbesondere auch einen niedervoltigen Messstrom in den Induktor einspeisen, so dass eine energiesparende Messung im Stand-by-Betrieb möglich ist. Dadurch kann ein energiesparender Detektionsbetrieb ermöglicht werden, der im Hinblick auf die Betriebskosten mit Kochfeldern konkurrieren kann, die eine separate Sensorik haben.It is proposed that the switching device is connected to the detection circuit in such a way that the switching device connects the inductor to the detection circuit in at least one second switching position. As a result, the inductor can be linked to the detection circuit in a structurally simple manner, which can then use the inductor as an inductive sensor. In particular, the detection circuit can also feed a low-voltage measuring current into the inductor, so that an energy-saving measurement in stand-by mode is possible. Thereby, an energy-saving detection mode can be made possible which, in terms of operating costs, can compete with cooktops having separate sensors.
Die beiden genannten Schaltstellungen können durch weitere Schaltstellungen der Schaltvorrichtung ergänzt werden, die jeweils weiteren Funktionen des Kochfelds entsprechen können. Beispielsweise kann die Schaltvorrichtung über Schaltstellungen verfügen, in denen ein Induktor gleichzeitig mit mehreren Wechselrichtern verbunden wird oder ein Wechselrichter gleichzeitig mehrere Induktoren betreibt.The two mentioned switching positions can be supplemented by further switching positions of the switching device, which can each correspond to other functions of the hob. For example, the switching device may have switch positions in which an inductor is simultaneously connected to a plurality of inverters or an inverter simultaneously operates a plurality of inductors.
In einer Weiterbildung der Erfindung wird vorgeschlagen, dass die Schaltvorrichtung zumindest ein elektromechanisches Relais mit zwei Ausgängen umfasst, wobei der erste Ausgang mit dem Wechselrichter verbunden ist und der zweite Ausgang mit dem Detektionsschaltkreis verbunden ist. Dadurch kann eine besonders robuste Ausgestaltung der Erfindung erreicht werden. Im Vergleich zu einer Realisation der Schaltvorrichtung als Anordnung von Halbleiter-Relais, in der pro Schalteinheit zwei Halbleiterschalter verwendet werden müssten, können Kosten eingespart werden und ein sicheres Schalten auch bei sehr starken Heizströmen kann gewährleistet werden. Die Eigenschaften eines elekt- romechanischen Double-Pole-Double-Throw-Relais sind insbesondere dann vorteilhaft, wenn sich die Stromstärken von Messstrom und Heizstrom um eine oder mehrere Größenordnungen unterscheiden.In a development of the invention, it is proposed that the switching device comprises at least one electromechanical relay with two outputs, wherein the first output is connected to the inverter and the second output is connected to the detection circuit. As a result, a particularly robust embodiment of the invention can be achieved. In comparison to a realization of the switching device as an arrangement of semiconductor relay, in the per switching unit two semiconductor switches would have to be used, costs can be saved and a reliable switching can be ensured even with very high heating currents. The properties of a double-pole electro-mechanical double-throw relay are particularly advantageous if the currents of measuring current and heating current differ by one or more orders of magnitude.
Wenn das Kochfeld eine Mehrzahl von Induktoren umfasst, die insbesondere in einem Raster, einem Gitter oder einer Matrix angeordnet sein können, kommen die Vorteile der Erfindung besonders zum Tragen. Auch hier können die Verbindungen zwischen den einzelnen Induktoren mit dem jeweils den Induktoren zugeordneten Wechselrichtern über die Schaltvorrichtung geöffnet oder geschlossen werden.If the hob comprises a plurality of inductors, which may in particular be arranged in a grid, a grid or a matrix, the advantages of the invention are particularly significant. Again, the connections between the individual inductors with the respective inductors associated with the inverter can be opened or closed via the switching device.
In einer besonders vorteilhaften Ausgestaltung der Erfindung kann der Detektions- schaltkreis mit dem Induktor einen Schwingkreis bilden. Das Vorhandensein oder Nicht- vorhandensein des Kochgeschirrs kann abhängig von einer Resonanzfrequenz des Schwingkreises ermittelt werden. Eine gezielte Steuerung kann ermöglicht werden, wenn das Kochfeld eine Steuereinheit zum Auslesen des Detektionsschaltkreises und/oder zum Schalten der Schaltvorrichtung umfasst.In a particularly advantageous embodiment of the invention, the detection circuit with the inductor form a resonant circuit. The presence or absence of the cookware can be determined depending on a resonant frequency of the resonant circuit. A targeted control can be made possible if the hob comprises a control unit for reading the detection circuit and / or for switching the switching device.
Eine besonders flexible modulare Bauweise kann erreicht werden, wenn ein dem Induktor zugeordneter Schalter der Schaltvorrichtung unmittelbar mit dem Induktor verbunden ist. Der Induktor kann insbesondere eine Induktorspule, einen Induktorträger und ein Ab- schirmelement umfassen. Diese Elemente können zu einem kompakten Induktormodul zusammengefasst sein, das erfindungsgemäß zudem den insbesondere als elektrome- chanischen Relais-Schalter ausgebildeten Schalter umfassen kann. Kabel zum Herstellen einer Verbindung mit dem Wechselrichter und mit dem Detektionsschaltkreis können unmittelbar in zwei verschiedene Ausgänge des Induktormoduls eingesteckt bzw. in einer anderen Weise, beispielsweise mittels eines geeigneten mehrpoligen Steckers, mit diesen verbunden werden. Die beiden Ausgänge sind mit den beiden Ausgängen des Schalters verbunden, dessen Eingang seinerseits mit dem Induktor verbunden ist.A particularly flexible modular design can be achieved if a switch of the switching device assigned to the inductor is connected directly to the inductor. The inductor may in particular comprise an inductor coil, an inductor carrier and a shielding element. These elements can be combined to form a compact inductor module, which, according to the invention, can additionally comprise the switch designed, in particular, as an electromechanical relay switch. Cables for establishing a connection to the inverter and to the detection circuit can be plugged directly into two different outputs of the inductor module or connected in another way, for example by means of a suitable multi-pin connector. The two outputs are connected to the two outputs of the switch whose input is in turn connected to the inductor.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeich- nung 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. Es zeigen:Further advantages emerge from the following description of the drawing. In the drawing, 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. Show it:
Fig. 1 eine schematische Darstellung eines Induktionskochfelds mit mehreren in einem Raster angeordneten Induktoren, einer Schaltvorrich- tung und einer Mehrzahl von Wechselrichtern,1 is a schematic representation of an induction hob with a plurality of arranged in a grid inductors, a switching device and a plurality of inverters,
Fig. 2 eine schematische Darstellung eines Induktors mit einer Schaltvorrichtung, die in einer ersten Schaltstellung den Induktor mit einem Wechselrichter und in einer zweiten Schaltstellung den Induktor mit einem Detektionsschaltkreis verbindet undFig. 2 is a schematic representation of an inductor with a switching device which connects the inductor with an inverter in a first switching position and the inductor with a detection circuit in a second switching position and
Fig. 3 ein Induktormodul mit einem integrierten Schalter der Schaltvorrichtung.3 shows an inductor module with an integrated switch of the switching device.
Figur 1 zeigt ein Induktionskochfeld vom Matrix-Typ mit einer Vielzahl von in einem Raster angeordneten Induktoren 10. Die Induktoren 10 bilden ein rechteckiges Raster und kön- nen auf mehrere Module aufgeteilt sein, die jeweils von unterschiedlichen Stromversorgungseinheiten gespeist werden (nicht dargestellt). Die Induktoren 10 können selektiv und einzeln aktiviert und deaktiviert werden, wozu eine Schaltvorrichtung 14 eine Verbindung zwischen den Induktoren 10 und einem dem jeweiligen Induktor 10 zugeordneten Wechselrichter 12 herstellen oder unterbrechen kann.FIG. 1 shows a matrix-type induction hob with a large number of inductors 10 arranged in a grid. The inductors 10 form a rectangular grid and can be divided into a plurality of modules, each of which is supplied by different power supply units (not shown). The inductors 10 can be selectively and individually activated and deactivated, for which purpose a switching device 14 can establish or interrupt a connection between the inductors 10 and an inverter 12 assigned to the respective inductor 10.
In einer ersten Schaltstellung der Schaltvorrichtung 14 ist der Wechselrichter 12 mit dem Induktor 10 verbunden, so dass ein Wechselstrom mit einer Frequenz von einigen Kilohertz bis maximal ca. 75 oder 100 Kilohertz getrieben durch eine Spannungsamplitude von einigen hundert Volt durch die Induktoren 10 fließt. Die Induktoren 10 erzeugen ein starkes, hochfrequentes Magnetfeld, das teilweise in den Boden eines Kochgeschirrs 18 eindringt, wenn ein Kochgeschirr 18 mit einem ferromagnetischen Boden auf das Induktionskochfeld aufgestellt ist. Durch das wechselnde Magnetfeld werden in einem ferromagnetischen Boden des Kochgeschirrs 18 Wirbelströme erzeugt, die den Boden schließlich erhitzen.In a first switching position of the switching device 14, the inverter 12 is connected to the inductor 10, so that an alternating current with a frequency of a few kilohertz to a maximum of about 75 or 100 kilohertz driven by a voltage amplitude of several hundred volts through the inductors 10 flows. The inductors 10 generate a strong, high-frequency magnetic field, which partially penetrates into the bottom of a cookware 18 when a cookware 18 is placed with a ferromagnetic bottom on the induction hob. Due to the changing magnetic field 18 eddy currents are generated in a ferromagnetic ground of the cookware, which eventually heat the ground.
Fig. 1 ist eine schematische Darstellung, die nicht die tatsächliche Anordnung der Induktoren 10 bezüglich der Schaltvorrichtung 14 und des Wechselrichters 12 wiedergibt. Die Schaltvorrichtung 14 kann mit den Wechselrichtern 12 auf einer gemeinsamen Platine montiert sein oder eine baulich getrennte Einheit bilden.FIG. 1 is a schematic diagram that does not show the actual arrangement of the inductors 10 with respect to the switching device 14 and the inverter 12. The Switching device 14 may be mounted with the inverters 12 on a common board or form a structurally separate unit.
Fig. 2 zeigt schematisch einen beliebigen Induktor 10 des Induktionskochfelds aus Fig. 1 mit dem diesem Induktor 10 zugeordneten Wechselrichter 12 und einem Detektions- schaltkreis 16. Der Detektionsschaltkreis 16 kann ebenfalls mit der Schaltvorrichtung 14 und/oder den Wechselrichtern 12 auf einer gemeinsamen Platine montiert sein oder alternativ als separate Baugruppe vorliegen.FIG. 2 schematically shows an arbitrary inductor 10 of the induction hob of FIG. 1 with the inverter 12 and a detection circuit 16 associated with this inductor 10. The detection circuit 16 may also be mounted with the switching device 14 and / or the inverters 12 on a common circuit board be present or alternatively as a separate module.
Zwischen dem Induktor 10 und dem Wechselrichter 12 ist ein als elektromechanisches Relais 20 ausgebildetes Schaltelement der Schaltvorrichtung 14 angeordnet. Das elekt- romechanische Relais 20 umfasst zwei Ausgänge 24, 26. Der erste Ausgang 24 ist mit dem Wechselrichter 12 und der zweite Ausgang 26 mit dem Detektionsschaltkreis 16 verbunden. Das elektromechanische Relais 20 ist als „Double Pole Double Throw"-Relais (DPDT-Relais) mit zwei parallel geschalteten Arbeitskontakten ausgebildet. Eine Steuereinheit 22 liest den Detektionsschaltkreis 16 aus und ist über eine Steuerleitung 28 mit der Spule eines Elektromagneten 29 des Relais 20 verbunden. Die Steuereinheit 22 kann ein Microcontroller oder eine frei programmierbare Recheneinheit sein, die neben den Induktoren 10, der Schaltvorrichtung 14 und dem Detektionsschaltkreis 16 noch weitere elekt- ronische Baugruppen des Kochfelds betreibt, beispielsweise eine Benutzerschnittstelle mit einem Display oder dergleichen. Das Ergebnis der Kochgeschirrdetektion kann dann auf dem Display dargestellt werden.Between the inductor 10 and the inverter 12 is designed as an electromechanical relay 20 switching element of the switching device 14 is arranged. The electromechanical relay 20 comprises two outputs 24, 26. The first output 24 is connected to the inverter 12 and the second output 26 to the detection circuit 16. The electromechanical relay 20 is designed as a "Double Pole Double Throw" relay (DPDT relay) with two work contacts connected in parallel A control unit 22 reads out the detection circuit 16 and is connected via a control line 28 to the coil of an electromagnet 29 of the relay 20 The control unit 22 may be a microcontroller or a freely programmable arithmetic unit which, in addition to the inductors 10, the switching device 14 and the detection circuit 16, also operates further electronic components of the hob, for example a user interface with a display or the like can then be shown on the display.
In der zweiten Schaltstellung, in welcher die Schaltkontakte des Relais 20 den zweiten Ausgang 26 des Relais 20 mit dem Induktor 10 verbinden, bildet der Induktor 10 mit dem Detektionsschaltkreis 16 einen Colpitts-Oszillator, in welchem zwei Kapazitäten und der Induktor 10 die Oszillationsfrequenz bestimmen. Das für die Oszillation notwendige Feedback wird über einen Spannungsteiler zwischen den beiden Kapazitäten erzeugt (nicht dargestellt).In the second switching position, in which the switching contacts of the relay 20 connect the second output 26 of the relay 20 to the inductor 10, the inductor 10 forms with the detection circuit 16 a Colpitts oscillator, in which two capacitances and the inductor 10 determine the oscillation frequency. The feedback necessary for the oscillation is generated by a voltage divider between the two capacitors (not shown).
Der Detektionsschaltkreis 16 wird mit einer schwachen Wechselspannung beaufschlagt, die in dem entsprechenden Induktor 10 eine wechselnde Messspannung von ca. 10 oder 12 Volt erzeugt und zu Mesströmen von einigen Milliampere führt. Der Induktor 10 wird in diesem Betriebszustand als Messsonde verwendet. Der Induktor 10 bildet zusammen mit zwei Kondensatoren einen Schwingkreis. Durch das Aufstellen des Kochgeschirrs 18 wird die Induktivität des aus dem Induktor 10 und dem Kochgeschirr 18 bestehenden Gesamtsystems gegenüber der Induktivität des freien Induktors 10 reduziert, wodurch sich die Resonanzfreqenz des Schwingkreises um etwa 10% erhöht. Der Detektionsschaltkreis 16 bzw. die Steuereinheit 22 misst die Resonanzfrequenz dieses Gesamtsystems und schließt aus der erhöhten Resonanzfrequenz auf das Vorhandensein des Kochgeschirrs 18.The detection circuit 16 is supplied with a weak alternating voltage, which generates in the corresponding inductor 10 an alternating measuring voltage of about 10 or 12 volts and leads to measuring currents of a few milliamperes. The inductor 10 is used in this operating state as a probe. The inductor 10 forms a resonant circuit together with two capacitors. By setting up the cookware 18 is reduces the inductance of the existing of the inductor 10 and the cookware 18 total system over the inductance of the free inductor 10, whereby the Resonanzfreqenz of the resonant circuit increases by about 10%. The detection circuit 16 or the control unit 22 measures the resonant frequency of this overall system and concludes from the increased resonant frequency on the presence of the cookware 18th
Figur 3 zeigt ein Induktormodul mit dem Induktor 10 und dem als Relais 20 ausgebildeten Schaltelement der Schaltvorrichtung 14 in einer denkbaren Ausgestaltung der Erfindung. Das Relais 20 ist unmittelbar an eine Unterseite eines Induktorträgers 30 angebracht, so dass es mit dem Induktor 10 ein gut handhabbares Modul bildet. Entsprechende Verbindungsleitungen zu den Wechselrichtern 12 und/oder dem Detektionsschaltkreis 16 können beim Anschließen des Induktormoduls unmittelbar in die Ausgänge 24, 26 des Relais eingesteckt werden. FIG. 3 shows an inductor module with the inductor 10 and the switching element of the switching device 14 in the form of a relay 20 in a conceivable embodiment of the invention. The relay 20 is directly attached to a bottom of an inductor carrier 30, so that it forms an easy to handle module with the inductor 10. Corresponding connection lines to the inverters 12 and / or the detection circuit 16 can be plugged directly into the outputs 24, 26 of the relay when connecting the inductor module.
Bezugszeichenreference numeral
10 Induktor10 inductor
12 Wechselrichter12 inverters
14 Schaltvorrichtung14 switching device
16 Detektionsschaltkreis16 detection circuit
18 Kochgeschirr18 cookware
20 Relais20 relays
22 Steuereinheit22 control unit
24 Ausgang24 output
26 Ausgang26 output
28 Steuerleitung28 control line
29 Elektromagnet29 electromagnet
30 Induktorträger 30 inductor carrier

Claims

Patentansprüche claims
1. Kochfeld mit zumindest einem Induktor (10), wenigstens einem Wechselrich- ter (12), einer Schaltvorrichtung (14) und einem Detektionsschaltkreis (16) zum1. hob with at least one inductor (10), at least one inverter (12), a switching device (14) and a detection circuit (16) for
Detektieren von Kochgeschirr (18), wobei die Schaltvorrichtung (14) in einem Stromkreis zwischen dem Induktor (10) und dem Wechselrichter (12) angeordnet ist, so dass die Schaltvorrichtung (14) in einer ersten Schaltstellung eine Verbindung zwischen dem Wechselrichter (12) und dem Induktor (10) herstellt und die- se Verbindung zwischen dem Wechselrichter (12) und dem Induktor (10) in wenigstens einer zweiten Schaltstellung unterbricht, dadurch gekennzeichnet, dass die Schaltvorrichtung (14) derart mit dem Detektionsschaltkreis (16) verbunden ist, dass die Schaltvorrichtung (14) in der wenigstens einen zweiten Schaltstellung den Induktor (10) mit dem Detektions- Schaltkreis (16) verbindet.Detecting cookware (18), wherein the switching device (14) in a circuit between the inductor (10) and the inverter (12) is arranged, so that the switching device (14) in a first switching position, a connection between the inverter (12) and the inductor (10) and interrupts this connection between the inverter (12) and the inductor (10) in at least one second switching position, characterized in that the switching device (14) is connected to the detection circuit (16) in such a way, in that the switching device (14) in the at least one second switching position connects the inductor (10) to the detection circuit (16).
2. Kochfeld nach Anspruch 1 , dadurch gekennzeichnet, dass die Schaltvorrichtung (14) zumindest ein elektromechanisches Relais (20) mit wenigstens zwei Ausgängen umfasst, wobei der erste Ausgang mit dem Wechselrichter (12) ver- bunden ist und der zweite Ausgang mit dem Detektionsschaltkreis (16) verbunden ist.2. Hob according to claim 1, characterized in that the switching device (14) comprises at least one electromechanical relay (20) having at least two outputs, wherein the first output to the inverter (12) is connected and the second output to the detection circuit (16) is connected.
3. Kochfeld nach einem der vorhergehenden Ansprüche, gekennzeichnet durch eine Mehrzahl von Induktoren (10), die in einem Raster angeordnet sind, wobei Verbindungen zwischen den einzelnen Induktoren (10) und dem wenigstens einen Wechselrichter (12) über die Schaltvorrichtung (14) geöffnet oder geschlossen werden können.3. Hob according to one of the preceding claims, characterized by a plurality of inductors (10) which are arranged in a grid, wherein connections between the individual inductors (10) and the at least one inverter (12) via the switching device (14) open or can be closed.
4. Kochfeld nach einem der vorhergehenden Ansprüche, dadurch gekennzeich- net, dass der Detektionsschaltkreis (16) mit dem Induktor (10) einen Schwingkreis bildet, dessen Resonanzfrequenz höher als die Frequenz eines Heizstroms der Induktoren (10) ist. 4. Hob according to one of the preceding claims, characterized marked, that the detection circuit (16) with the inductor (10) forms a resonant circuit whose resonant frequency is higher than the frequency of a heating current of the inductors (10).
5. Kochfeld nach einem der vorhergehenden Ansprüche, gekennzeichnet durch eine Steuereinheit (22) zum Auslesen des Detektionsschaltkreises (16).5. Hob according to one of the preceding claims, characterized by a control unit (22) for reading the detection circuit (16).
6. Kochfeld nach einem der vorhergehenden Ansprüche, dadurch gekennzeich- net, dass ein dem Induktor (10) zugeordneter Schalter (20) der Schaltvorrichtung6. Hob according to one of the preceding claims, characterized marked, that a the inductor (10) associated switch (20) of the switching device
(14) unmittelbar mit dem Induktor (10) verbunden ist.(14) is directly connected to the inductor (10).
7. Kochfeld nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein in der ersten Schaltstellung auf den Induktor (10) übertragener Heizstrom wenigstens 1000 mal größer ist als ein in der zweiten Schaltstellung auf den Induktor (10) übertragener Messstrom. 7. Hob according to one of the preceding claims, characterized in that in the first switching position on the inductor (10) transmitted heating current is at least 1000 times greater than a in the second switching position on the inductor (10) transmitted measuring current.
EP09771545A 2008-12-19 2009-12-07 Hob having at least one inductor, at least one inverter and a switching apparatus Not-in-force EP2380398B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200803711A ES2356441B1 (en) 2008-12-19 2008-12-19 COOKING FIELD WITH AN INDUCTOR, AN INVESTOR AND A CONNECTION DEVICE.
PCT/EP2009/066468 WO2010069788A1 (en) 2008-12-19 2009-12-07 Hob having at least one inductor, at least one inverter and a switching apparatus

Publications (2)

Publication Number Publication Date
EP2380398A1 true EP2380398A1 (en) 2011-10-26
EP2380398B1 EP2380398B1 (en) 2012-10-31

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EP09771545A Not-in-force EP2380398B1 (en) 2008-12-19 2009-12-07 Hob having at least one inductor, at least one inverter and a switching apparatus

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US (1) US9668305B2 (en)
EP (1) EP2380398B1 (en)
KR (1) KR101603366B1 (en)
CN (1) CN102257878B (en)
ES (2) ES2356441B1 (en)
WO (1) WO2010069788A1 (en)

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CN102257878A (en) 2011-11-23
ES2356441A1 (en) 2011-04-08
US20110233199A1 (en) 2011-09-29
CN102257878B (en) 2013-09-11
KR20110110193A (en) 2011-10-06
EP2380398B1 (en) 2012-10-31
KR101603366B1 (en) 2016-03-14
ES2356441B1 (en) 2012-03-13
WO2010069788A1 (en) 2010-06-24
US9668305B2 (en) 2017-05-30
ES2394151T3 (en) 2013-01-22

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