EP1878309B1 - Method and arrangement for supplying power to several induction coils in an induction apparatus - Google Patents
Method and arrangement for supplying power to several induction coils in an induction apparatus Download PDFInfo
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- EP1878309B1 EP1878309B1 EP06742762A EP06742762A EP1878309B1 EP 1878309 B1 EP1878309 B1 EP 1878309B1 EP 06742762 A EP06742762 A EP 06742762A EP 06742762 A EP06742762 A EP 06742762A EP 1878309 B1 EP1878309 B1 EP 1878309B1
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- Prior art keywords
- induction
- frequency
- power
- induction coils
- coils
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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
- H05B6/36—Coil arrangements
- H05B6/44—Coil arrangements having more than one coil or coil segment
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
- H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
Definitions
- the invention relates to a method for supplying power to a plurality of induction coils in an induction device and to an arrangement for carrying out this method.
- ferrites for magnetic field guidance are provided under induction coils. These ferrites are subject to magnetostriction, ie a change in length, depending on the operating frequency of the induction coil. This is at least partially true for used cookware.
- the working frequency of induction coils is usually above the audible range, the noise can be heard through intermodulation with another powered induction coil.
- audible mixing products can arise from the frequency difference of the operating frequencies and their harmonic harmonics.
- Further intermodulation can occur when two frequency converters for the induction coils are connected to a common supply voltage are. In this case, one frequency converter modulates the supply voltage for the other frequency converter.
- the ES-A1-2201937 describes a method for powering a plurality of induction coils in an induction device, wherein in each case a frequency converter supplies power to each induction coil.
- cut-off frequencies 2 kHz and 14 kHz are used, which are set as a frequency difference if the outputs are to differ.
- the upper cutoff frequency an operation of the induction coil can be achieved, which is at the upper end or even outside the human hearing threshold.
- the US-A-4542273 describes a similar method for powering a plurality of induction coils in an induction device.
- each induction coil has its own power supply. If two or more resonant circuits of the induction coils are operated, they operate at the same frequency or a frequency difference is equal to zero. This avoids unwanted noise.
- the invention has for its object to provide an aforementioned method and an arrangement with which the problems of the prior art can be avoided and in particular an advantageous operation of multiple induction coils is possible with the lowest possible noise.
- the induction coils at the respective start of operation ie when several coils are to be operated, with the required values, which have been input by an operator for each induction coil via an operating device, first operated at high frequency or highest operating frequency of the system.
- the function as pot detection coils is particularly advantageous. This makes it possible to detect whether an appropriate cooking vessel is to be heated via an induction coil. Then the frequencies are lowered with the frequency converters. This takes place until the total power of the induction coils corresponds to the total power of the required values for the individual powers. Since this still takes place at the same frequency, as a rule, ie at different required values for the power P, the one induction coil operated with more power than required and the other with less power.
- the frequencies are very close in operation.
- the frequency difference is even 500 Hz and less.
- the frequency difference is in a very high range for the human ear or is no longer in the audible range.
- the method operates exactly two induction coils, as described in the present application.
- the possible variation of the operating frequencies and setting a certain frequency difference is particularly good and predictable possible.
- each induction cooker may have a single induction coil.
- an induction cooking station may have an induction coil which consists of several partial coils and / or which can be driven by a plurality of power generators or frequency converters. This then corresponds to so-called multi-circuit heaters, as they are known from radiant heaters.
- Induction coils in particular for household use, such as an induction oven or an induction hob, are advantageously operated in a frequency range of about 16 kHz to 100 kHz.
- a clocking or alternating operation of the induction coils can take place if the required values do not change.
- the sum of the powers at common frequency f g corresponds to the sum of the powers at different frequencies. she is at the same time the required total power for both induction coils.
- Another possibility may be to first try to satisfy the conditions with a first lower frequency difference, for example the said 18 kHz. If this is not the case, or if the intended algorithm does not work for the adjustment, then it can be attempted with a second somewhat higher frequency difference of about 24 kHz.
- a first lower frequency difference for example the said 18 kHz.
- FIG. 1 an induction hob 11 is shown in section.
- an operating device 15 is arranged with two rotary knobs 16 and 17 for the power setting.
- the representation of the operating device 15 is to be understood very schematically and of course all other controls can be provided, in particular also so-called touch switch.
- the operating device 15 is connected to a controller 18 and, among other things, passes on the control commands by adjusting the rotary knobs 16 and 17 to the controller 18.
- the controller 18 in turn is connected to a first inverter 19 which is supplied with a frequency f 1, a first inductor L1, and with a second inverter 20 which is supplied with the frequency f 2, a second inductor L2.
- the induction coils L1 and L2 are arranged in a known manner below the hob plate 13. On its underside, ferrites 21 are arranged in a likewise known manner for influencing the magnetic field generated by the induction coils L. Above the induction coils L1 and L2 are on the hob plate 13 cookware 22 and 23 attached. The larger cookware 23 illustrates to what extent the coupling of a higher power should or should be done here. This can also be seen in the position of the rotary knob 17, which is further adjusted to the right and thus to a higher power level than the left rotary knob 16. Here, the rotary knob 16 is used to adjust the power for the induction cooker formed by the left induction coil L1 and the right rotary knob 17 for the induction cooker formed by the right induction coil L2.
- FIGS. 2 and 3 For example, as will be described below together, it is shown how the inductors L1 and L2 are supplied with power P at a certain frequency of the supply voltage. The curves for the frequency and the power are shown in dashed lines for the coil L2.
- both induction coils L1 and L2 are operated with common frequency, namely with f max in the sense of a pan detection function. This is sufficiently known to the person skilled in the art and need not be explained in more detail here.
- suitable cookware namely the cookware 22 and 23, are set up and thus an operation is possible. Accordingly, power is released by the controller 18 and the frequency converters 19 and 20.
- the frequency set by the frequency converters 19 and 20 is lowered by an equal value to the value f g .
- This value f g results from the specifications that both induction coils L1 and L2 should be operated at the same frequency, namely f g , and with the powers P 1 (f g ) and P 2 (f g ).
- the powers P 1 (f g ) and P 2 (f g ) result from the specification with f g and the set and predetermined value for the total power generated via the rotary knobs 16 and 17.
- the induction coil L1 is operated with the power P 1 (f g ), which is greater than the average intended power P 1 .
- the inductor L2 is operated at a power P 2 (fg) which is below the mean intended power P 2 lies.
- the operated at excessive power inductor L1 is increased in terms of their operating frequency f 1 by a frequency difference .DELTA.f, which is 18 kHz in the present case.
- both operating frequencies are lowered with the fixed frequency interval ⁇ f.
- the lowering takes place until the frequencies f v1 and f v2 are reached with the powers P 1 (f v ) and P 2 (f v ).
- the sum of P 1 (f v) and P 2 (f v) the sum of P 1 (f g) and P 2 (f G).
- the above-mentioned frequency difference of 18 kHz during the operating mode c) is present, which means a barely audible noise.
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- General Induction Heating (AREA)
- Induction Heating Cooking Devices (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Leistungsversorgung mehrerer Induktionsspulen bei einem Induktionsgerät sowie eine Anordnung zur Durchführung dieses Verfahrens.The invention relates to a method for supplying power to a plurality of induction coils in an induction device and to an arrangement for carrying out this method.
Bei Induktionskochmulden besteht häufig das Problem, dass es beim Betrieb mehrerer Kochstellen zu hörbaren Geräuschen kommen kann. Diese werden von einer Bedienperson teilweise als unangenehm empfunden, insbesondere nicht nur wegen der Geräusche an sich, sondern auch weil die Vermutung nahe liegt, dass eine Fehlfunktion der Induktionskochmulde vorliegt. Das Geräuschempfinden wiederum ist auch abhängig von der Intensität des Schallpegels sowie der Übereinstimmung mit einer menschlichen Hörkurve, also abhängig von der Frequenz der Geräusche.For induction hobs, there is often the problem that there may be audible noise when operating multiple burners. These are sometimes perceived by an operator as unpleasant, in particular not only because of the noise itself, but also because the assumption is obvious that there is a malfunction of the induction hob. The perception of noise, in turn, is also dependent on the intensity of the sound level as well as the agreement with a human hearing curve, thus depending on the frequency of the sounds.
Für diese Geräusche gibt es mehrere Ursachen. Zum einen sind unter Induktionsspulen Ferrite zur Magnetfeldführung vorgesehen. Diese Ferrite unterliegen einer Magnetostriktion, also einer Längenveränderung, abhängig von der Arbeitsfrequenz der Induktionsspule. Dies gilt zumindest teilweise auch für verwendete Kochgeschirre. Zwar liegt die Arbeitsfrequenz von Induktionsspulen üblicherweise über dem hörbaren Bereich, allerdings können durch Intermodulation mit einer anderen betriebenen Induktionsspule die Geräusche hörbar werden. Dabei können hörbare Mischprodukte aus der Frequenzdifferenz der Arbeitsfrequenzen und deren harmonischen Oberwellen entstehen. Weitere Intermodulationen können entstehen, wenn zwei Frequenzumrichter für die Induktionsspulen an einer gemeinsamen Versorgungsspannung angeschlossen sind. In diesem Fall moduliert ein Frequenzumrichter die Versorgungsspannung für den anderen Frequenzumrichter.There are several causes for these noises. On the one hand, ferrites for magnetic field guidance are provided under induction coils. These ferrites are subject to magnetostriction, ie a change in length, depending on the operating frequency of the induction coil. This is at least partially true for used cookware. Although the working frequency of induction coils is usually above the audible range, the noise can be heard through intermodulation with another powered induction coil. In this case, audible mixing products can arise from the frequency difference of the operating frequencies and their harmonic harmonics. Further intermodulation can occur when two frequency converters for the induction coils are connected to a common supply voltage are. In this case, one frequency converter modulates the supply voltage for the other frequency converter.
Die
Die
Der Erfindung liegt die Aufgabe zugrunde, ein eingangs genanntes Verfahren sowie eine Anordnung zu schaffen, mit denen die Probleme des Standes der Technik vermieden werden können und insbesondere ein vorteilhafter Betrieb mehrerer Induktionsspulen möglich ist mit möglichst geringer Geräuschentwicklung.The invention has for its object to provide an aforementioned method and an arrangement with which the problems of the prior art can be avoided and in particular an advantageous operation of multiple induction coils is possible with the lowest possible noise.
Gelöst wird diese Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1 sowie eine Anordnung mit den Merkmalen des Anspruchs 7. Vorteilhafte sowie bevorzugte Ausgestaltungen der Erfindung sind Gegenstand der weiteren Ansprüche und werden im folgenden näher erläutert. Der Wortlaut der Ansprüche wird durch ausdrückliche Bezugnahme zum Inhalt der Beschreibung gemacht.This object is achieved by a method having the features of claim 1 and an arrangement having the features of claim 7. Advantageous and preferred embodiments of the invention are the subject of the other claims and will be described in more detail below explained. The wording of the claims is incorporated herein by express reference.
Jede Induktionsspule wird über einen eigenen Frequenzumrichter oder eine eigene Frequenzumrichtereinheit mit Leistung versorgt. Erfindungsgemäß werden beim gemeinsamen Betrieb mehrerer Induktionsspulen die Betriebsfrequenzen bzw. die Frequenzen der jeweiligen Frequenzumrichter für die einzelnen Induktionsspulen abhängig von einer vorgesehenen Leistung bzw. von durch eine Bedienperson mittels Eingabe für die Leistung geforderten Werten hinsichtlich einer Differenz zwischen den Frequenzen, also eine Frequenzdifferenz, nach einem der möglichen folgenden Betriebsmodi eingestellt:
- a) Die Frequenzdifferenz beträgt nahezu Null, vorteilhaft ist sie Null.
- b) Die Frequenzdifferenz beträgt weniger als 1 kHz, ist also vorteilhaft zwar vorhanden, aber relativ gering.
- c) Die Frequenzdifferenz beträgt zwischen 15 kHz und 25 kHz bzw.
liegt nicht mehr im hörbaren Bereich.
- a) The frequency difference is almost zero, advantageously it is zero.
- b) The frequency difference is less than 1 kHz, so it is advantageous, but relatively low.
- c) The frequency difference is between 15 kHz and 25 kHz or
is no longer in the audible range.
Erfindungsgemäß werden die Induktionsspulen bei jeweiligem Betriebsbeginn, also wenn mehrere Spulen betrieben werden sollen, mit den geforderten Werten, die von einer Bedienperson für jede Induktionsspule über eine Bedieneinrichtung eingegeben worden sind, zuerst mit hoher Frequenz bzw. höchster Betriebsfrequenz des Systems betrieben. Besonders vorteilhaft erfolgt dadurch die Funktion als Topferkennungs-Spulen. Dadurch kann erkannt werden, ob über eine Induktionsspule ein damit zu erwärmendes geeignetes Kochgefäß vorhanden ist. Anschließend werden die Frequenzen mit den Frequenzumrichtern abgesenkt. Dies erfolgt so weit, bis die Gesamtleistung der Induktionsspulen der Gesamtleistung der geforderten Werte für die Einzelleistungen entspricht. Da dies noch bei derselben Frequenz erfolgt, wird hier in der Regel, also bei unterschiedlichen geforderten Werten für die Leistung P, die eine Induktionsspule mit mehr Leistung betrieben als gefordert und die andere mit weniger Leistung.According to the invention, the induction coils at the respective start of operation, ie when several coils are to be operated, with the required values, which have been input by an operator for each induction coil via an operating device, first operated at high frequency or highest operating frequency of the system. The function as pot detection coils is particularly advantageous. This makes it possible to detect whether an appropriate cooking vessel is to be heated via an induction coil. Then the frequencies are lowered with the frequency converters. This takes place until the total power of the induction coils corresponds to the total power of the required values for the individual powers. Since this still takes place at the same frequency, as a rule, ie at different required values for the power P, the one induction coil operated with more power than required and the other with less power.
Diese zutreffende Summenleistung liegt bei einer gemeinsamen Frequenz fg vor. Anschließend wird die Induktionsspule, welche mit überhöhter Leistung betrieben wird, um die Frequenzdifferenz gemäß Betriebsmodus c) nach oben gesetzt. Die anderen Induktionsspulen verbleiben bei der bis dahin bestehenden Frequenz. Ist die Frequenzdifferenz wie gefordert eingestellt, so werden anschließend sämtliche Induktionsspulen in ihrer Betriebsfrequenz mit fest eingehaltener Frequenzdifferenz Δf nach unten gefahren, und zwar so lange, bis die Summenleistung wieder dem geforderten Wert entspricht.This true total power is at a common frequency f g . Subsequently, the induction coil, which is operated at excessive power, set by the frequency difference according to operation mode c) upwards. The other induction coils remain at the existing frequency. If the frequency difference is set as required, then all inductors are then driven down in their operating frequency with fixed frequency difference .DELTA.f down, and that until the total power again corresponds to the required value.
Beim ersten Betriebsmodus a) kann es zu keinen Frequenzdifferenzen kommen. Somit können auch keine störenden Intermodulationen bzw. keine hörbaren Auswirkungen entstehen.In the first operating mode a) there can be no frequency differences. Thus, no disturbing intermodulation or no audible effects can arise.
Beim zweiten Betriebsmodus b) liegen die Frequenzen im Betrieb sehr nahe beieinander. Vorteilhaft beträgt die Frequenzdifferenz hierbei sogar 500 Hz und weniger. Zwar entsteht hierbei eine gewisse Intermodulation aus den eingestellten Frequenzen bzw. Betriebsfrequenzen der Induktionsspulen, aber aufgrund der sehr niedrigen Frequenzdifferenzen sind sie kaum wahrnehmbar, da sie in einem Bereich der menschlichen Hörkurve liegen, in dem das durchschnittliche menschliche Ohr relativ unempfindlich ist.In the second operating mode b) the frequencies are very close in operation. Advantageously, the frequency difference is even 500 Hz and less. Although this results in a certain intermodulation of the set frequencies or operating frequencies of the induction coils, but because of the very low frequency differences, they are barely perceptible, since they are in an area of the human hearing curve in which the average human ear is relatively insensitive.
Im dritten Betriebsmodus c) ist die Frequenzdifferenz in einem für das menschliche Ohr sehr hohen Bereich bzw. liegt nicht mehr im hörbaren Bereich. Hier hat sich im Rahmen der Erfindung zusätzlich herausgestellt, dass bei einer Frequenzdifferenz von etwa 18 kHz sowie auch 24 kHz eine besonders gute Unterdrückung von hörbaren Geräuschen möglich ist.In the third operating mode c) the frequency difference is in a very high range for the human ear or is no longer in the audible range. Here, it has additionally been found in the context of the invention that, with a frequency difference of about 18 kHz as well as 24 kHz, a particularly good suppression of audible noise is possible.
Somit stehen also drei Möglichkeiten zur Verfügung, mehrere Induktionsspulen gemeinsam zu betreiben, ohne dass dieses störend zu hören ist. Diese drei Betriebsmodi sind vorteilhaft dafür zu nutzen, dass sowohl die mittlere Leistung für jede einzelne Induktionsspule als auch die gesamte mittlere Leistung einer von einer Bedienperson gewählten Leistungsstufe entspricht. Ist dies durch einen konstanten Betrieb mit einem der Betriebsmodi a) oder b) möglich, also mit jeweils fester und unveränderter Frequenz, so ist dies eine vorteilhaft zu wählende Betriebsweise mehrerer Induktionsspulen.Thus, there are three options available to operate several induction coils together without this being annoying to hear. These three modes of operation are advantageous in that both the average power for each individual inductor and the total average power corresponds to a power level selected by an operator. If this is possible by means of a constant operation with one of the operating modes a) or b), ie with a respectively fixed and unchanged frequency, this is an advantageous mode of operation of a plurality of induction coils.
Vorteilhaft werden mit dem Verfahren genau zwei Induktionsspulen betrieben, wie in der vorliegenden Anmeldung beschrieben ist. Hierbei ist die mögliche Variation der Betriebsfrequenzen und Einstellung einer bestimmten Frequenzdifferenz besonders gut und vorhersehbar möglich.Advantageously, the method operates exactly two induction coils, as described in the present application. Here, the possible variation of the operating frequencies and setting a certain frequency difference is particularly good and predictable possible.
Es ist einerseits möglich, dass jede Induktionskochstelle eine einzige Induktionsspule aufweist. Alternativ kann eine Induktionskochstelle eine Induktionsspule aufweisen, die aus mehreren Teilspulen besteht und/oder die durch mehrere Leistungsgeneratoren bzw. Frequenzumrichter ansteuerbar ist. Dies entspricht dann sogenannten Mehrkreis-Heizungen, wie sie von Strahlungsheizeinrichtungen bekannt sind.It is possible, on the one hand, for each induction cooker to have a single induction coil. Alternatively, an induction cooking station may have an induction coil which consists of several partial coils and / or which can be driven by a plurality of power generators or frequency converters. This then corresponds to so-called multi-circuit heaters, as they are known from radiant heaters.
Induktionsspulen, insbesondere für eine Anwendung im Haushaltsbereich, wie bei einem Induktionsbackofen oder einem Induktionskochfeld, werden vorteilhaft in einem Frequenzbereich von etwa 16 kHz bis 100 kHz betrieben.Induction coils, in particular for household use, such as an induction oven or an induction hob, are advantageously operated in a frequency range of about 16 kHz to 100 kHz.
Anschließend kann ein taktender bzw. wechselnder Betrieb der Induktionsspulen erfolgen, falls sich die geforderten Werte nicht verändern. Dieser Betrieb sieht so aus, dass entweder mit der gemeinsamen Frequenz fg für eine bestimmte Zeit tg ein Betrieb erfolgt, wobei sich die Zeit tg folgendermaßen berechnet:
Oder es erfolgt daran anschließend ein Betrieb mit den beiden unterschiedlichen Frequenzen und der Frequenzdifferenz Δf, und zwar für die Zeit tv, wobei tg + tv = T. Danach wechselt der Betrieb zwischen diesen beiden Betriebsarten.Or it is then followed by an operation with the two different frequencies and the frequency difference .DELTA.f, namely for the time t v , where t g + t v = T. Thereafter, the operation switches between these two modes.
Sollte sich einer der geforderten Werte für die Leistung für eine der Induktionsspulen ändern, so wird dieses Verfahren der Ermittlung der Werte für die Frequenzen und die Zeiten erneut durchgeführt.Should one of the required values for the power for one of the induction coils change, this method of determining the values for the frequencies and the times is carried out again.
Die Summe der Leistungen bei gemeinsamer Frequenz fg entspricht dabei der Summe der Leistungen bei verschiedenen Frequenzen. Sie ist gleichzeitig gleich der geforderten Summenleistung für beide Induktionsspulen.The sum of the powers at common frequency f g corresponds to the sum of the powers at different frequencies. she is at the same time the required total power for both induction coils.
Bei einem solchen Betrieb ist auch ein flickerfreier Anschluss an ein Versorgungsnetz möglich. Sollte jedoch mit keinem der vorgenannten Betriebsmodi eine zu den geforderten Werten passende Einstellung gefunden werden können, bei der sich auch die Frequenzdifferenz im genannten Rahmen bewegt, so ist unter Umständen für eine bestimmte Zeit ein Betrieb mit geringem Flicker notwendig bzw. unumgänglich. Einschränkende Randbedingungen hier können z.B. sein: eine minimale Arbeitsfrequenz eines Frequenzumrichters, eine maximal zulässige Amplitude des Stroms im Frequenzumrichter, eine kleinste zulässige Phase in einem Schwingkreis in dem Frequenzumrichter sowie auch Sättigungseffekte in Ferriten, die an den Induktionsspulen vorgesehen sind zur Beeinflussung des erzeugten Magnetfeldes.In such an operation, a flicker-free connection to a supply network is possible. However, if none of the aforesaid operating modes can be used to find a setting which matches the required values, and at which the frequency difference also moves within said range, it may be necessary or necessary to operate with a low level of flicker for a certain period of time. Restrictive constraints here may be e.g. a minimum operating frequency of a frequency converter, a maximum permissible amplitude of the current in the frequency converter, a smallest permissible phase in a resonant circuit in the frequency converter as well as saturation effects in ferrites, which are provided on the induction coils for influencing the generated magnetic field.
Eine weitere Möglichkeit kann vorsehen, dass zuerst mit einer ersten niedrigeren Frequenzdifferenz, beispielsweise den genannten 18 kHz, versucht wird, die Bedingungen zu erfüllen. Geht dies nicht bzw. greift der beabsichtigte Algorithmus zur Einstellung nicht, so kann es mit einer zweiten etwas höheren Frequenzdifferenz von etwa 24 kHz versucht werden.Another possibility may be to first try to satisfy the conditions with a first lower frequency difference, for example the said 18 kHz. If this is not the case, or if the intended algorithm does not work for the adjustment, then it can be attempted with a second somewhat higher frequency difference of about 24 kHz.
Diese und weitere Merkmale gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei einer Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutzfähige Ausführungen darstellen können, für die hier Schutz beansprucht wird. Die Unterteilung der Anmeldung in einzelne Abschnitte sowie Zwischen-Überschriften beschränken die unter diesen gemachten Aussagen nicht in ihrer Allgemeingültigkeit.These and other features will become apparent from the claims and from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in one embodiment of the invention and in other fields be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into individual sections as well as intermediate headings does not restrict the general validity of the statements made thereunder.
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen schematisch dargestellt und wird im folgenden näher erläutert. In den Zeichnungen zeigt:
- Fig. 1
- ein Schaltbild einer Anordnung von zwei Induktionsspulen in einem Induktionskochfeld mit jeweils einem Frequenzumrichter,
- Fig. 2
- ein Schaubild der Betriebsfrequenz f über der Zeit t und
- Fig. 3
- ein Schaubild der Leistung P über der Zeit t.
- Fig. 1
- a circuit diagram of an arrangement of two induction coils in an induction hob, each with a frequency converter,
- Fig. 2
- a graph of the operating frequency f over the time t and
- Fig. 3
- a graph of power P over time t.
In
Die Bedieneinrichtung 15 ist mit einer Steuerung 18 verbunden und gibt unter anderem die Steuerbefehle durch Einstellung der Drehknebel 16 und 17 an die Steuerung 18 weiter. Die Steuerung 18 wiederum ist mit einem ersten Frequenzumrichter 19 verbunden, der mit einer Frequenz f1 eine erste Induktionsspule L1 versorgt, sowie mit einem zweiten Frequenzumrichter 20, der mit der Frequenz f2 eine zweite Induktionsspule L2 versorgt.The operating
Die Induktionsspulen L1 und L2 sind auf bekannte Art und Weise unterhalb der Kochfeldplatte 13 angeordnet. An ihrer Unterseite sind Ferrite 21 auf ebenfalls bekannte Art und Weise angeordnet zur Beeinflussung des durch die Induktionsspulen L erzeugten Magnetfeldes. Oberhalb der Induktionsspulen L1 und L2 sind auf die Kochfeldplatte 13 Kochgeschirre 22 und 23 aufgesetzt. Durch das größere Kochgeschirr 23 wird veranschaulicht, inwiefern hier die Einkopplung einer höheren Leistung erfolgen sollte bzw. gewünscht ist. Dies ist auch an der Stellung des Drehknebels 17 zu erkennen, der weiter nach rechts und somit auf eine höhere Leistungsstufe eingestellt ist als der linke Drehknebel 16. Dabei dient der Drehknebel 16 zur Einstellung der Leistung für die durch die linke Induktionsspule L1 gebildete Induktionskochstelle und der rechte Drehknebel 17 für die durch die rechte Induktionsspule L2 gebildete Induktionskochstelle.The induction coils L1 and L2 are arranged in a known manner below the
In
Der Betrieb beginnt damit, dass beide Induktionsspulen L1 und L2 mit gemeinsamer Frequenz betrieben werden, und zwar mit fmax im Sinne einer Topferkennungs-Funktion. Dieses ist dem Fachmann ausreichend bekannt und braucht hier nicht näher erläutert zu werden. Bei beiden Induktionsspulen L1 und L2 wird festgestellt, dass geeignete Kochgeschirre, nämlich die Kochgeschirre 22 und 23, aufgestellt sind und somit ein Betrieb möglich ist. Dementsprechend erfolgt eine Leistungsfreigabe durch die Steuerung 18 sowie die Frequenzumrichter 19 und 20.The operation starts with the fact that both induction coils L1 and L2 are operated with common frequency, namely with f max in the sense of a pan detection function. This is sufficiently known to the person skilled in the art and need not be explained in more detail here. In both inductors L1 and L2 it is found that suitable cookware, namely the
Daraufhin wird die von den Frequenzumrichtern 19 und 20 eingestellte Frequenz mit einem gleichen Wert abgesenkt bis auf den Wert fg. Dieser Wert fg ergibt sich aus den Vorgaben, dass beide Induktionsspulen L1 und L2 mit derselben Frequenz, nämlich fg, betrieben werden sollen und mit den Leistungen P1(fg) und P2(fg). Die Leistungen P1(fg) und P2(fg) ergeben sich aus der Vorgabe mit fg und dem über die Drehknebel 16 und 17 eingestellten und vorgegebenen Wert für die insgesamt erzeugte Leistung.Subsequently, the frequency set by the
Es ist zu erkennen, inwiefern bei dem ersten Betrieb mit der gemeinsamen Frequenz fg die Induktionsspule L1 mit der Leistung P1(fg) betrieben wird, welche größer ist als die mittlere vorgesehene Leistung
Anschließend daran erfolgt für eine bestimmte Zeit tv mit genau diesen Werten für fv1 und fv2 bzw. der daraus resultierenden Frequenzdifferenz Δf ein Betrieb. Daran schließt sich der Betrieb mit der gemeinsamen Frequenz fg an, wobei hier die Leistungen P1(fg) und P2(fg) betragen, also wiederum die Induktionsspule L1 mit überhöhter und die Induktionsspule L2 mit abgesenkter Leistung betrieben werden. Dieser Zeitraum tg berechnet sich nach der folgenden Formel:
Anschließend an diese Zeit tg erfolgt wieder für eine Zeit tv der zuvor erläuterte Betrieb mit den Frequenzen fv1 und fv2. Dabei gilt tg + tv = T.Subsequent to this time t g , the previously explained operation with the frequencies f v1 and f v2 takes place again for a time t v . In this case, t g + t v = T.
Insgesamt wechselt ab hier, solange die vorgegebenen Leistungswerte
Somit liegt hier ein Betrieb vor mit dem eingangs genannten Betriebsmodus a), nämlich für die Zeit tg, und Betriebsmodus c), nämlich für die Zeit tv. Während der Zeit tg entsteht überhaupt keine Geräuschentwicklung, da ja mit derselben Frequenz gearbeitet wird und somit überhaupt keine Intermodulationen entstehen können.Thus, here is an operation with the aforementioned operating mode a), namely for the time t g , and operating mode c), namely for the time t v . During the time t g , no noise is generated at all, since the same frequency is used and thus no intermodulation can occur at all.
Während der Zeit tv liegt die eingangs genannte Frequenzdifferenz von 18 kHz während des Betriebsmodus c) vor, welche eine kaum hörbare Geräuschentwicklung bedeutet.During the time t v , the above-mentioned frequency difference of 18 kHz during the operating mode c) is present, which means a barely audible noise.
Somit ist es insgesamt durch das beschriebene und erfindungsgemäße Verfahren möglich, die Geräuschentwicklung zu vermeiden oder stark zu reduzieren und dabei immer noch eine geforderte Leistung, zumindest im Mittelwert, durch die Induktionsheizungen zu erzeugen.Thus, it is altogether possible by the described and inventive method to avoid or greatly reduce the noise while still producing a required performance, at least in the mean, by the induction heaters.
Treten während des in den
Claims (9)
- Method for supplying power to several induction coils (L1, L2) in an induction apparatus (11), each induction coil (L1, L2) being supplied with power by means of its own frequency converter (19, 20), characterized in that during the common operation of several induction coils the frequencies of the given frequency converter (19, 20) are set as a function of the power provided with respect to a frequency difference (Δf) according to one of the following operating modes:- a) the frequency difference is equal to zero,- b) the frequency difference is less than 1 kHz,- c) the frequency difference is between 15 and 25 kHz,at the start of operation the induction coils (L1, L2) being operated with the requisite values for the individual power levels and the total power of the induction apparatus (11) initially with a high frequency and subsequently accompanied by the reduction of the frequency and the rise of the power the total power for the induction coils is set at the requisite value, one induction coil (L1) having more power than required (P1(fg)) and another induction coil (L2) less power than required (P2(fg)), the induction coils having up to then the same common frequency (fg), and subsequently the induction coil with the increased power is moved upwards in frequency by a frequency difference according to operating mode c), and then the frequencies of the induction coils with the fixed mutual frequency difference (Δf) are lowered to the extent that the total power of the induction coils corresponds to the requisite value (
P 1 +P 2) for the total power. - Method according to claim 1, characterized in that precisely two induction coils (L1, L2) are operated according to one of the aforementioned operating modes (a) to c).
- Method according to claim 1 or 2, characterized in that the induction coils (L1, L2) are operated in a frequency range of 16 kHz to 100 kHz.
- Method according to claim 1, characterized in that subsequently alternating operation of the induction coils (L1, L2) takes place with either the aforementioned first common frequency (fg) for a first specific time (tg) or with the aforementioned frequency difference (Δf) for a second specific time (tv), the first specific time (tg) being equal to:
- Method according to any of the preceding claims, characterized in that the frequency difference (Δf) for operating mode b) is max 500 Hz.
- Method according to any of the preceding claims, characterized in that the frequency difference (Δf) for operating mode c) is 18 kHz.
- Arrangement for performing the method according to any of the preceding claims, characterized in that it is an induction cooker, particularly an induction hob (11), with at least two induction hotplates.
- Arrangement according to claim 7, characterized in that each induction hotplate has a single induction coil (L1, L2).
- Arrangement according to claim 7, characterized in that one induction hotplate has an induction coil comprising several partial coils and/or which is controllable by several power generators or frequency converters.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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PL06742762T PL1878309T3 (en) | 2005-05-04 | 2006-05-02 | Method and arrangement for supplying power to several induction coils in an induction apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005021888A DE102005021888A1 (en) | 2005-05-04 | 2005-05-04 | Method and arrangement for power supply of a plurality of induction coils in an induction device |
PCT/EP2006/004081 WO2006117182A1 (en) | 2005-05-04 | 2006-05-02 | Method and arrangement for supplying power to several induction coils in an induction apparatus |
Publications (2)
Publication Number | Publication Date |
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EP1878309A1 EP1878309A1 (en) | 2008-01-16 |
EP1878309B1 true EP1878309B1 (en) | 2012-07-25 |
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EP06742762A Revoked EP1878309B1 (en) | 2005-05-04 | 2006-05-02 | Method and arrangement for supplying power to several induction coils in an induction apparatus |
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US (1) | US7910865B2 (en) |
EP (1) | EP1878309B1 (en) |
JP (1) | JP5027115B2 (en) |
KR (1) | KR101260086B1 (en) |
CN (1) | CN101208994B (en) |
DE (1) | DE102005021888A1 (en) |
ES (1) | ES2389935T3 (en) |
PL (1) | PL1878309T3 (en) |
WO (1) | WO2006117182A1 (en) |
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-
2005
- 2005-05-04 DE DE102005021888A patent/DE102005021888A1/en not_active Withdrawn
-
2006
- 2006-05-02 PL PL06742762T patent/PL1878309T3/en unknown
- 2006-05-02 ES ES06742762T patent/ES2389935T3/en active Active
- 2006-05-02 KR KR1020077025580A patent/KR101260086B1/en not_active IP Right Cessation
- 2006-05-02 CN CN2006800230030A patent/CN101208994B/en not_active Expired - Fee Related
- 2006-05-02 EP EP06742762A patent/EP1878309B1/en not_active Revoked
- 2006-05-02 WO PCT/EP2006/004081 patent/WO2006117182A1/en active Application Filing
- 2006-05-02 JP JP2008509361A patent/JP5027115B2/en not_active Expired - Fee Related
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2007
- 2007-11-02 US US11/934,480 patent/US7910865B2/en not_active Expired - Fee Related
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EP4383943A1 (en) | 2022-12-09 | 2024-06-12 | SABAF S.p.A. | Induction cooktop and method for controlling an induction cooktop |
Also Published As
Publication number | Publication date |
---|---|
KR20080020987A (en) | 2008-03-06 |
PL1878309T3 (en) | 2012-12-31 |
US7910865B2 (en) | 2011-03-22 |
DE102005021888A1 (en) | 2007-02-15 |
JP5027115B2 (en) | 2012-09-19 |
ES2389935T3 (en) | 2012-11-05 |
US20080087661A1 (en) | 2008-04-17 |
KR101260086B1 (en) | 2013-05-02 |
EP1878309A1 (en) | 2008-01-16 |
CN101208994A (en) | 2008-06-25 |
WO2006117182A1 (en) | 2006-11-09 |
CN101208994B (en) | 2011-11-02 |
JP2008541343A (en) | 2008-11-20 |
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