EP1734789B1 - Method and device for controlling the power supply of an induction heating device - Google Patents
Method and device for controlling the power supply of an induction heating device Download PDFInfo
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- EP1734789B1 EP1734789B1 EP06011351A EP06011351A EP1734789B1 EP 1734789 B1 EP1734789 B1 EP 1734789B1 EP 06011351 A EP06011351 A EP 06011351A EP 06011351 A EP06011351 A EP 06011351A EP 1734789 B1 EP1734789 B1 EP 1734789B1
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- frequency
- supply voltage
- working frequency
- switching means
- course
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
Definitions
- the invention relates to a method for supplying an induction heater with power and an arrangement for supplying power to an induction heater.
- Such induction heating devices are widely used, for example, as induction coils in induction cooking fields. There is a desire for ever higher performance, in particular cooking operations of larger amounts of liquid, such as pasta water to be able to perform quickly.
- the frequency converters necessary for the power supply exceed by standards specified limits with regard to the harmonics and system perturbations.
- the cause of the strong effects of the harmonics or in particular the third harmonic is essentially that the permeability of the magnetic Components in the frequency converter with the amplitude of the inductor current flowing through the induction coil changes.
- the permeability of ferrites or the like which are used in an induction coil for field guidance, and those of the pot material decreases. This in turn changes the inductance of the induction coil in the course of a half-wave of the supply voltage and, consequently, also the resonant frequency of a series resonant circuit, as used in the power supply.
- the current consumption is ultimately distorted from the network or differs in its course from the predetermined course of the supply voltage.
- the invention has for its object to provide an aforementioned method and an arrangement can be avoided with the problems of the prior art and in particular higher power can be generated in induction heaters or network interferences or distortions of power consumption can be reduced from the supply network.
- an operating frequency of the switching means or of the entire frequency converter is slightly increased in the course of a half-wave of the supply voltage or operating voltage of the induction coil and then lowered again. This is done by basically establishing a frequency base value of the operating frequency. Based on this, the working frequency is first increased slightly in the course of the half-wave and then lowered again. This is done in such a way that at least at the zero crossings of the supply voltage the operating frequency is present with the basic frequency value and is increased therebetween.
- the frequency converter or the power supply can have a series resonant circuit.
- This consists of an induction coil, which represents the power transmission for the induction heater, resonant circuit capacitors and a half-bridge with the switchable switching means.
- a series resonant circuit for induction heating is known.
- the operating frequency then reaches a maximum when the supply voltage or operating voltage in turn reaches a maximum.
- the course of the operating frequency during a half-wave of the supply voltage to that of the supply voltage itself basically similar.
- the operating frequency can be changed as continuously and continuously as possible. This is possible by a corresponding control of the frequency converter or the switching means.
- the course of the working frequency in a rising section is equal to that in a descending section.
- the course of the working frequency during a half-wave is approximately mirror-symmetrical.
- the point of mirror symmetry lies at the maximum or half the duration of the half-wave.
- Such an aforementioned operating frequency is for example in the range of a few kHz, preferably 10kHz to 60kHz, more preferably about 20kHz.
- An application according to the invention with which, for example, an aforementioned method can be carried out has a frequency converter which contains a previously described series resonant circuit.
- a drive device is provided for the switching means. This is designed to change the operating frequency of the switching means or the frequency converter so that in the course of a half-wave of the supply voltage or operating voltage, the operating frequency of a frequency base value first increases up to a maximum and then drops back to the frequency base value , This has already been explained above.
- FIG. 2 shows an arrangement or circuit arrangement 11 according to the invention.
- a controller 13 controls a frequency converter 15 with two switching means T 1 and T 2 , for example, transistors. These form together with a DC link capacitor C Zw and resonant circuit capacitors C s, the control for the induction coil L. On the controller 13, especially the operating frequency for the switching means T 1 and T 2 and thus the frequency converter 15 is specified.
- This course of the operating frequency f and the other variables according to FIG. 1 is shown by way of example in FIG. Starting from a basic frequency f G of approximately 20 kHz here, the operating frequency f increases in a manner similar to the profile of the operating voltage U across a half-wave and then returns to the basic frequency value f G. This results in the course shown for the inductor current I as well as a substantially constant impedance Z of the induction coil L. This course of the inductor current I in turn is now the sine wave of the operating voltage U b adapted again. Thus, as has been explained in detail before, disturbing network perturbations can be reliably avoided.
- the induction coil L is used in an induction heating device or a heating device for an induction hob, then even more than 3 kW or 3.2 kW are possible, for example 3.5 kW to 3.7 or even 4 kW. Thus, stronger induction hobs can be built for faster parboiling or higher power transmission.
- the effort for the control of the operating frequency f of the frequency converter 15 and the switching means T 1 and T 2 is not particularly serious. In particular, if the course of the operating frequency f is predetermined or controlled by a control process, the effort is kept within limits since it is possible to work with previously known progressions.
- the inductor current I can be detected and the operating frequency f are controlled so that the inductor current I exactly has an exact sinusoidal shape or another predetermined shape.
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Versorgung einer Induktionsheizeinrichtung mit Leistung sowie eine Anordnung zur Leistungsversorgung einer Induktionsheizeinrichtung.The invention relates to a method for supplying an induction heater with power and an arrangement for supplying power to an induction heater.
Derartige Induktionsheizeinrichtungen werden beispielsweise als Induktionsspulen vielfach in Induktionskochfeldern eingesetzt. Dabei besteht der Wunsch nach immer höheren Leistungen, um insbesondere Kochvorgänge größerer Mengen von Flüssigkeit, beispielsweise Nudelwasser, schnell durchführen zu können.Such induction heating devices are widely used, for example, as induction coils in induction cooking fields. There is a desire for ever higher performance, in particular cooking operations of larger amounts of liquid, such as pasta water to be able to perform quickly.
Derzeit liegt bei etwa 3,2kW eine Grenze, ab welcher die für die Leistungsversorgung notwendigen Frequenzumrichter durch Normen vorgegebene Grenzwerte hinsichtlich der Oberschwingungen und Netzrückwirkungen überschreiten. Die Ursache für die starken Auswirkungen der Oberschwingungen bzw. insbesondere der dritten Oberschwingung liegt im wesentlichen darin, dass sich die Permeabilität der magnetischen Komponenten im Frequenzumrichter mit der Amplitude des Induktorstromes, der durch die Induktionsspule fließt, ändert. Bei hohen Stromamplituden sinkt die Permeabilität von Ferriten odgl., die in einer Induktionsspule zur Feldführung eingesetzt werden, und auch die des Topfmaterials. Dadurch ändert sich wiederum die Induktivität der Induktionsspule im Verlauf einer Halbwelle der Versorgungsspannung und daraus folglich auch die Resonanzfrequenz eines Serienschwingkreises, wie er in der Leistungsversorgung verwendet wird. Dadurch wird letztendlich die Stromaufnahme aus dem Netz verzerrt bzw. weicht in ihrem Verlauf von dem vorgegebenen Verlauf der Versorgungsspannung ab.Currently, at about 3.2kW, there is a limit beyond which the frequency converters necessary for the power supply exceed by standards specified limits with regard to the harmonics and system perturbations. The cause of the strong effects of the harmonics or in particular the third harmonic is essentially that the permeability of the magnetic Components in the frequency converter with the amplitude of the inductor current flowing through the induction coil changes. At high current amplitudes, the permeability of ferrites or the like, which are used in an induction coil for field guidance, and those of the pot material decreases. This in turn changes the inductance of the induction coil in the course of a half-wave of the supply voltage and, consequently, also the resonant frequency of a series resonant circuit, as used in the power supply. As a result, the current consumption is ultimately distorted from the network or differs in its course from the predetermined course of the supply voltage.
Der Erfindung liegt die Aufgabe zugrunde, ein eingangs genanntes Verfahren sowie eine Anordnung zu schaffen, mit der Probleme des Standes der Technik vermieden werden können und insbesondere höhere Leistungen bei Induktionsheizeinrichtungen erzeugt werden können bzw. Netzrückwirkungen oder Verzerrungen der Stromaufnahme aus dem Versorgungsnetz reduziert werden können.The invention has for its object to provide an aforementioned method and an arrangement can be avoided with the problems of the prior art and in particular higher power can be generated in induction heaters or network interferences or distortions of power consumption can be reduced from the supply network.
Gelöst wird diese Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1, einer Anordnung mit den Merkmalen des Anspruchs 10 sowie die Anwendung des genannten Verfahrens für ein Induktionskochfeld bzw. eine Induktionsheizeinrichtung. 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. Manche der nachfolgend aufgezählten Merkmale und Eigenschaften treffen sowohl auf das Verfahren als auch auf die Anordnung zu. Sie werden teilweise nur einmal beschrieben, gelten jedoch unabhängig voneinander sowohl für das Verfahren als auch die Anordnung und Anwendung.This object is achieved by a method having the features of claim 1, an arrangement having the features of
Zur Leistungsversorgung der Induktionsheizeinrichtung dient eine Wechsel-Versorgungsspannung. Des weiteren ist ein Frequenzumrichter vorgesehen mit schaltbaren Schaltmittein. Erfindungsgemäß wird eine Arbeitsfrequenz der Schaltmittel bzw. des gesamten Frequenzumrichters im Verlauf einer Halbwelle der Versorgungsspannung oder Betriebsspannung der Induktionsspule leicht erhöht und dann wieder abgesenkt. Dies erfolgt dadurch, dass grundsätzlich ein Frequenz-Grundwert der Arbeitsfrequenz festgelegt ist. Davon ausgehend wird die Arbeitsfrequenz im Verlauf der Halbwelle zuerst leicht erhöht und dann wieder abgesenkt. Dies erfolgt derart, dass zumindest an den Nulldurchgängen der Versorgungsspannung die Arbeitsfrequenz mit dem Frequenz-Grundwert vorliegt und dazwischen erhöht ist.To supply power to the induction heater is an AC supply voltage. Furthermore, a frequency converter is provided with switchable Schaltmittein. According to the invention, an operating frequency of the switching means or of the entire frequency converter is slightly increased in the course of a half-wave of the supply voltage or operating voltage of the induction coil and then lowered again. This is done by basically establishing a frequency base value of the operating frequency. Based on this, the working frequency is first increased slightly in the course of the half-wave and then lowered again. This is done in such a way that at least at the zero crossings of the supply voltage the operating frequency is present with the basic frequency value and is increased therebetween.
So ist es möglich, durch ein zeitweises Erhöhen der Arbeitsfrequenz der Entstehung von Oberwellen direkt entgegenzuwirken. Vor allem kann dadurch ein in einem Schwingkreis der Leistungsversorgung fließender Strom proportional zur Versorgungsspannung gehalten werden. Dadurch werden die Netzrückwirkungen erheblich vermindert.It is thus possible to directly counteract the formation of harmonics by temporarily increasing the operating frequency. Above all, this allows a current flowing in a resonant circuit of the power supply to be kept proportional to the supply voltage. As a result, the network perturbations are significantly reduced.
In einer Weiterbildung der Erfindung kann der Frequenzumrichter bzw. die Leistungsversorgung einen Serienschwingkreis aufweisen. Dieser besteht aus einer Induktionsspule, welche die Leistungsübertragung für die Induktionsheizeinrichtung darstellt, Schwingkreiskondensatoren und einer Halbbrücke mit den schaltbaren Schaltmitteln. Grundsätzlich ist ein derartiger Serienschwingkreis für Induktionsheizeinrichtungen bekannt.In a development of the invention, the frequency converter or the power supply can have a series resonant circuit. This consists of an induction coil, which represents the power transmission for the induction heater, resonant circuit capacitors and a half-bridge with the switchable switching means. Basically, such a series resonant circuit for induction heating is known.
Es kann vorgesehen sein, dass die Arbeitsfrequenz dann ein Maximum erreicht, wenn die Versorgungsspannung bzw. Betriebsspannung ihrerseits ein Maximum erreicht. Somit kann also vorgesehen sein, dass der Verlauf der Arbeitsfrequenz während einer Halbwelle der Versorgungsspannung demjenigen der Versorgungsspannung selber grundsätzlich ähnelt. Unter Umständen kann es für eine vereinfachte Steuerung bzw. Beeinflussung der Arbeitsfrequenz sogar möglich sein, ihr Zunehmen und Absenken proportional mit der Versorgungsspannung zu verknüpfen.It can be provided that the operating frequency then reaches a maximum when the supply voltage or operating voltage in turn reaches a maximum. Thus, it can thus be provided that the course of the operating frequency during a half-wave of the supply voltage to that of the supply voltage itself basically similar. Under certain circumstances, it may even be possible for a simplified control or influencing of the working frequency to combine its increase and decrease proportionally with the supply voltage.
Um Netzwirkungen vollständig oder weitgehend zu vermeiden, hat sich im Rahmen der Erfindung herausgestellt, dass eine Erhöhung um maximal 15%, insbesondere sogar maximal 10%, über den Verlauf einer Halbwelle ausreicht, um die Änderung der Induktivität der Induktionsspule auszugleichen.In order to completely or largely avoid network effects, it has been found in the context of the invention that an increase of at most 15%, in particular even a maximum of 10%, over the course of a half-wave is sufficient to compensate for the change in the inductance of the induction coil.
Um eine Geräuschentwicklung in der Leistungsversorgung zu vermeiden, kann die Arbeitsfrequenz möglichst kontinuierlich und stufenlos verändert werden. Dies ist durch eine entsprechende Ansteuerung des Frequenzumrichters bzw. der Schaltmittel möglich.To avoid noise in the power supply, the operating frequency can be changed as continuously and continuously as possible. This is possible by a corresponding control of the frequency converter or the switching means.
Vorteilhaft ist vorgesehen, dass der Verlauf der Arbeitsfrequenz in einem ansteigenden Abschnitt gleich demjenigen in einem absteigenden Abschnitt ist. Dies bedeutet, dass der Verlauf der Arbeitsfrequenz während einer Halbwelle in etwa spiegelsymmetrisch ist. Der Punkt der Spiegelsymmetrie liegt dabei am Maximum bzw. bei der halben Dauer der Halbwelle.It is advantageously provided that the course of the working frequency in a rising section is equal to that in a descending section. This means that the course of the working frequency during a half-wave is approximately mirror-symmetrical. The point of mirror symmetry lies at the maximum or half the duration of the half-wave.
Eine solche vorgenannte Arbeitsfrequenz liegt beispielsweise im Bereich von einigen kHz, vorzugsweise 10kHz bis 60kHz, besonders bevorzugt bei etwa 20kHz.Such an aforementioned operating frequency is for example in the range of a few kHz, preferably 10kHz to 60kHz, more preferably about 20kHz.
Als Versorgungsspannung wird vorteilhaft normale Netzspannung in einem Haushalt verwendet, insbesondere mit Frequenz 50Hz und einer Spannung von 230V. Dadurch sind Leistungen von über 3kW bzw. sogar über 3,2kW oder 3,7kW ohne Überschreiten der Grenzwerte für Netzrückwirkungen möglich.As a supply voltage is advantageously used normal mains voltage in a household, in particular with frequency 50Hz and a voltage of 230V. As a result, outputs of more than 3kW or even more than 3,2kW or 3,7kW are possible without exceeding the limits for grid perturbations.
Wird ein solches Verfahren in einer Induktionsheizeinrichtung eines Haushaltsgerätes eingesetzt, insbesondere eines Induktionskochfeldes, so sind damit genannte Leistungswerte von weitaus mehr als 3kW möglich, ohne vorgeschriebene Grenzwerte für Netzrückwirkungen zu überschreiten.If such a method is used in an induction heating device of a domestic appliance, in particular an induction hob, so-called power values of much more than 3 kW are possible without exceeding prescribed limits for network perturbations.
Eine erfindungsgemäße Anwendung, mit der beispielsweise ein vorgenanntes Verfahren durchgeführt werden kann, weist einen Frequenzumrichter auf, der einen vorbeschriebenen Serienschwingkreis enthält. Für die Schaltmittel ist eine Ansteuereinrichtung vorgesehen. Diese ist dazu ausgebildet, die Arbeitsfrequenz der Schaltmittel bzw. des Frequenzumrichters so zu ändern, dass im Verlauf einer Halbwelle der Versorgungsspannung bzw. Betriebsspannung die Arbeitsfrequenz von einem Frequenz-Grundwert ausgehend erst ansteigt bis zu einem Maximum und dann wieder auf den Frequenz-Grundwert abfällt. Dies wurde vorstehend bereits erläutert.An application according to the invention with which, for example, an aforementioned method can be carried out has a frequency converter which contains a previously described series resonant circuit. For the switching means, a drive device is provided. This is designed to change the operating frequency of the switching means or the frequency converter so that in the course of a half-wave of the supply voltage or operating voltage, the operating frequency of a frequency base value first increases up to a maximum and then drops back to the frequency base value , This has already been explained above.
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 but also from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in an 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 im wesentlichen schematisch dargestellt und wird im folgenden näher erläutert. In den Zeichnungen zeigt:
- Fig. 1
- die Verläufe der Impedanz Z = w·L der Induktionsspule, der Betriebsspannung und der Amplitude des Induktorstromes über der Zeit gemäß dem Stand der Technik,
- Fig. 2
- ein Schaltbild einer Anordnung zur Leistungsversorgung einer Induktionsspule gemäß der Erfindung und
- Fig. 3
- die Kurven ähnlich Fig. 1 bei Anwendung des erfindungsgemäßen Verfahrens mit sich ändernder Arbeitsfrequenz des Frequenzumrichters.
- Fig. 1
- the characteristics of the impedance Z = w · L of the induction coil, the operating voltage and the amplitude of the inductor current over time according to the prior art,
- Fig. 2
- a circuit diagram of an arrangement for power supply to an induction coil according to the invention and
- Fig. 3
- the curves similar to FIG. 1 when using the method according to the invention with changing operating frequency of the frequency converter.
In Fig. 1 ist für bekannte Verfahren der Verlauf der Betriebsspannung U, der Impedanz Z = w·L der Induktionsspule L, des Induktorstromes I und der Arbeitsfrequenz f über der Zeit dargestellt. Es ist zu erkennen, wie bei konstanter Arbeitsfrequenz f die Impedanz Z der Induktionsspule L zum Hochpunkt einer Halbwelle der Betriebsspannung U hin absinkt. Des weiteren weicht vor allem der Verlauf des Induktorstromes I von dem der Betriebsspannung U ab, insbesondere weicht er von der Sinusform ab. Dies führt zu den erwähnten negativen Netzrückwirkungen.FIG. 1 shows the course of the operating voltage U, the impedance Z = w * L of the induction coil L, the inductor current I and the operating frequency f over time for known methods. It can be seen how, at a constant operating frequency f, the impedance Z of the induction coil L drops toward the peak of a half-wave of the operating voltage U. Furthermore, especially the course of the inductor current I deviates from that of the operating voltage U, in particular it deviates from the sinusoidal shape. This leads to the negative network effects mentioned.
In Fig. 2 ist eine erfindungsgemäße Anordnung bzw. Schaltungsanordnung 11 dargestellt. Eine Steuerung 13 steuert einen Frequenzumrichter 15 an mit zwei Schaltmitteln T1 und T2, beispielsweise Transistoren. Diese bilden zusammen mit einem Zwischenkreis-Kondensator CZw und Schwingkreiskondensatoren Cs die Ansteuerung für die Induktionsspule L. Über die Steuerung 13 wird vor allem die Arbeitsfrequenz für die Schaltmittel T1 und T2 und somit den Frequenzumrichter 15 vorgegeben.FIG. 2 shows an arrangement or
Dieser Verlauf der Arbeitsfrequenz f und der sonstigen Größen gemäß Fig. 1 ist in Fig. 3 beispielhaft dargestellt. Ausgehend von einem Frequenz-Grundwert fG von hier etwa 20kHz steigt die Arbeitsfrequenz f ähnlich dem Verlauf der Betriebsspannung U über einer Halbwelle an und geht dann wieder auf den Frequenz-Grundwert fG zurück. Dadurch ergibt sich der dargestellte Verlauf für den Induktorstrom I ebenso wie eine im wesentlichen konstante Impedanz Z der Induktionsspule L. Dieser Verlauf des Induktorstromes I wiederum ist nun der Sinusform der Betriebsspannung Ub wieder angepasst. Damit lassen sich, wie zuvor ausführlich erläutert worden ist, störende Netzrückwirkungen zuverlässig vermeiden.This course of the operating frequency f and the other variables according to FIG. 1 is shown by way of example in FIG. Starting from a basic frequency f G of approximately 20 kHz here, the operating frequency f increases in a manner similar to the profile of the operating voltage U across a half-wave and then returns to the basic frequency value f G. This results in the course shown for the inductor current I as well as a substantially constant impedance Z of the induction coil L. This course of the inductor current I in turn is now the sine wave of the operating voltage U b adapted again. Thus, as has been explained in detail before, disturbing network perturbations can be reliably avoided.
Wird die Induktionsspule L in einer Induktionsheizeinrichtung bzw. einer Heizeinrichtung für ein Induktionskochfeld eingesetzt, so sind damit Leistungen von sogar noch mehr als 3kW bzw. 3,2kW möglich, beispielsweise 3,5kW bis 3,7 oder sogar 4kW. Somit können stärkere Induktionskochfelder gebaut werden für schnellere Ankochvorgänge bzw. die Übertragung höherer Leistungen. Der Aufwand für die Steuerung der Arbeitsfrequenz f des Frequenzumrichters 15 bzw. der Schaltmittel T1 und T2 ist dabei nicht besonders gravierend. Insbesondere dann, wenn der Verlauf der Arbeitsfrequenz f fest vorgegeben bzw. mit einem Steuervorgang gesteuert vorgegeben wird, hält sich der Aufwand in Grenzen, da mit vorbekannten Verläufen gearbeitet werden kann.If the induction coil L is used in an induction heating device or a heating device for an induction hob, then even more than 3 kW or 3.2 kW are possible, for example 3.5 kW to 3.7 or even 4 kW. Thus, stronger induction hobs can be built for faster parboiling or higher power transmission. The effort for the control of the operating frequency f of the
In einer etwas aufwendigeren Weiterbildung der Erfindung ist es auch möglich, den Verlauf der Impedanz Z der Induktionsspule L zu erfassen und die Arbeitsfrequenz f so zu regeln, dass die Impedanz Z im wesentlichen konstant bleibt. Ebenso kann der Induktorstrom I erfasst werden und die Arbeitsfrequenz f so geregelt werden, dass der Induktorstrom I exakte Sinusform oder eine andere vorgegebene Form exakt aufweist.In a somewhat more elaborate embodiment of the invention, it is also possible to detect the course of the impedance Z of the induction coil L and to regulate the operating frequency f so that the impedance Z remains substantially constant. Likewise, the inductor current I can be detected and the operating frequency f are controlled so that the inductor current I exactly has an exact sinusoidal shape or another predetermined shape.
Claims (10)
- Method for supplying power to an induction heating device, an alternating supply voltage (Ub) and a frequency converter (15) with an adjustable switching means (T1, T2) being provided for supplying power, characterised in that a working frequency (f) of the switching means and of the frequency converter is first increased slightly during the course of a half wave of the supply voltage from a frequency base (fG) and then decreased again to the frequency base (fG) so that the working frequency (f) amounts to the frequency base (fG) at each zero crossing of the supply voltage (Ub).
- Method according to claim 1, characterised in that the frequency converter (15) comprises a series-tuned circuit which consists of an inductor coil (L), series-tuned capacitors (Cs) and a half bridge with the adjustable switching means (T1, T2).
- Method according to either claim 1 or claim 2, characterised in that the working frequency (f) reaches a peak when the supply voltage (Ub) reaches a peak.
- Method according to any one of the preceding claims, characterised in that the course of the respective working frequency (f) in an upward and downward portion is the same and the working frequency (f) is mirror-symmetrical to a point at half the length of a half wave of the supply voltage (Ub).
- Method according to any one of the preceding claims, characterised in that the increase in the working frequency (f) amounts to at most 15 %, in particular at most 10 %.
- Method according to any one of the preceding claims, characterised in that the working frequency changes smoothly and continuously.
- Method according to any one of the preceding claims, characterised by a power supply with values over 3 kW, preferably over 3.2 kW.
- Method according to any one of the preceding claims, characterised in that the supply voltage (Ub) has a network frequency of 50 Hz or 60 Hz, preferably at a voltage of from 230 V or 240 V.
- Method according to any one of the preceding claims, characterised by an application in an induction heating device (L) of a household appliance, in particular an induction cooker.
- Arrangement for supplying power to an induction heating device with a frequency converter (15) which comprises a series-tuned circuit with an inductor coil (L), series-tuned capacitors (Cs) and a half bridge with adjustable switching means (T1, T2), wherein an activating device (13) for activating the switching means (T1, T2) with a working frequency (f) is provided which is configured for changing the working frequency (f) such that said working frequency (f) first increases from a frequency base (fG) to a peak and then returns again to the frequency base (fG) over the course of a half wave of the supply voltage (Ub).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005028829A DE102005028829A1 (en) | 2005-06-14 | 2005-06-14 | Method and arrangement for supplying power to an induction heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1734789A1 EP1734789A1 (en) | 2006-12-20 |
| EP1734789B1 true EP1734789B1 (en) | 2008-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06011351A Not-in-force EP1734789B1 (en) | 2005-06-14 | 2006-06-01 | Method and device for controlling the power supply of an induction heating device |
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| Country | Link |
|---|---|
| EP (1) | EP1734789B1 (en) |
| JP (1) | JP2006353085A (en) |
| CN (1) | CN1882201B (en) |
| AT (1) | ATE384414T1 (en) |
| DE (2) | DE102005028829A1 (en) |
| ES (1) | ES2300080T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2112862A1 (en) | 2008-04-25 | 2009-10-28 | Electrolux Home Products Corporation N.V. | Method and arrangement for dynamic wave form correction |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006041964A1 (en) | 2006-08-25 | 2008-04-03 | E.G.O. Elektro-Gerätebau GmbH | Method and arrangement for supplying power to an induction heater |
| EP2224787B1 (en) * | 2009-02-26 | 2019-01-23 | Electrolux Home Products Corporation N.V. | A method and device for controlling an induction heating cooking apparatus |
| EP2525485B1 (en) * | 2011-05-19 | 2016-07-13 | Whirlpool Corporation | Method to increase the regulation range of AC-AC Quasi Resonant (QR) converters |
| US10182472B2 (en) | 2011-12-29 | 2019-01-15 | Arcelik Anonim Sirketi | Wireless kitchen appliance operated on induction heating cooker |
| US10129935B2 (en) | 2011-12-29 | 2018-11-13 | Arcelik Anonim Sirketi | Wireless kitchen appliance operated on an induction heating cooker |
| CN105338674B (en) * | 2014-07-02 | 2019-04-30 | 浙江苏泊尔家电制造有限公司 | A kind of electric cooker of electromagnetic heating method and the electromagnetic heating using this method |
| EP3151631B1 (en) | 2015-10-02 | 2018-06-13 | Electrolux Appliances Aktiebolag | Induction heating method and system |
| EP3151632B1 (en) | 2015-10-02 | 2018-06-13 | Electrolux Appliances Aktiebolag | Induction heating method and system |
| CN106686785A (en) * | 2015-11-11 | 2017-05-17 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating apparatus and control method therefor |
| EP3177107B1 (en) * | 2015-12-02 | 2024-01-24 | E.G.O. Elektro-Gerätebau GmbH | Method for operating an induction cooking hob |
| ES2673132B1 (en) * | 2016-12-19 | 2019-03-28 | Bsh Electrodomesticos Espana Sa | Induction cooking appliance device. |
| EP3386270B1 (en) | 2017-04-04 | 2019-11-27 | Electrolux Appliances Aktiebolag | Induction heating method and system |
| EP3967108A1 (en) * | 2019-05-10 | 2022-03-16 | BSH Hausgeräte GmbH | Cooking appliance |
| DE102022202805A1 (en) | 2022-03-22 | 2023-09-28 | E.G.O. Elektro-Gerätebau GmbH | Method for operating an induction hob and induction hob |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1053761A (en) * | 1974-12-13 | 1979-05-01 | White-Westinghouse Corporation | Induction cooking apparatus |
| CN2471015Y (en) * | 2000-12-14 | 2002-01-09 | 上海思源电气有限公司 | Frequency-variable resonant power supply |
| US6727482B2 (en) * | 2001-01-12 | 2004-04-27 | Nicholas Bassill | Apparatus and method for inductive heating |
| JP4752159B2 (en) * | 2001-09-05 | 2011-08-17 | パナソニック株式会社 | High frequency power supply |
| JP3831298B2 (en) * | 2002-06-05 | 2006-10-11 | 株式会社日立製作所 | Electromagnetic induction heating device |
| JP4045138B2 (en) * | 2002-07-19 | 2008-02-13 | 日立アプライアンス株式会社 | Induction heating cooker |
| US6870144B2 (en) * | 2002-12-24 | 2005-03-22 | Lg Electronics Inc. | Inverter circuit of induction heating rice cooker |
| JP4163662B2 (en) * | 2004-06-30 | 2008-10-08 | 日立アプライアンス株式会社 | Electromagnetic induction heating device |
-
2005
- 2005-06-14 DE DE102005028829A patent/DE102005028829A1/en not_active Withdrawn
-
2006
- 2006-06-01 DE DE502006000298T patent/DE502006000298D1/en active Active
- 2006-06-01 AT AT06011351T patent/ATE384414T1/en not_active IP Right Cessation
- 2006-06-01 ES ES06011351T patent/ES2300080T3/en active Active
- 2006-06-01 EP EP06011351A patent/EP1734789B1/en not_active Not-in-force
- 2006-06-08 JP JP2006159919A patent/JP2006353085A/en active Pending
- 2006-06-14 CN CN2006100936708A patent/CN1882201B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2112862A1 (en) | 2008-04-25 | 2009-10-28 | Electrolux Home Products Corporation N.V. | Method and arrangement for dynamic wave form correction |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE384414T1 (en) | 2008-02-15 |
| ES2300080T3 (en) | 2008-06-01 |
| CN1882201A (en) | 2006-12-20 |
| CN1882201B (en) | 2011-07-27 |
| DE102005028829A1 (en) | 2007-01-11 |
| JP2006353085A (en) | 2006-12-28 |
| EP1734789A1 (en) | 2006-12-20 |
| DE502006000298D1 (en) | 2008-03-06 |
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