EP2055144B1 - Method and arrangement for supplying power to an induction heating device - Google Patents

Method and arrangement for supplying power to an induction heating device Download PDF

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Publication number
EP2055144B1
EP2055144B1 EP07801786A EP07801786A EP2055144B1 EP 2055144 B1 EP2055144 B1 EP 2055144B1 EP 07801786 A EP07801786 A EP 07801786A EP 07801786 A EP07801786 A EP 07801786A EP 2055144 B1 EP2055144 B1 EP 2055144B1
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Prior art keywords
switching means
wave
pulse widths
dead times
pulse width
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German (de)
French (fr)
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EP2055144A1 (en
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Jörg Bögel
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EGO Elektro Geratebau GmbH
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EGO Elektro Geratebau GmbH
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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 power to an induction heating device and to an arrangement for supplying power to an induction heating device.
  • Such induction heating devices are used for example as induction coils in induction hobs.
  • induction hobs 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 cause of the strong effects of the harmonics or, in particular, of the third harmonic lies essentially in the fact that the permeability of the magnetic components in the frequency converter changes with the amplitude of the inductor current flowing through the induction coil.
  • the permeability of ferrites or the like which are used in an induction coil for field guidance, and those of the pot material decreases.
  • the invention has for its object to provide an initially mentioned method and a suitable arrangement with which problems of the prior art can be avoided and in particular reduced without changing the operating frequency at higher power at induction heaters network interference or distortion of power consumption from the supply network can be.
  • a frequency converter is provided with switchable switching means.
  • An operating frequency of this switching means or of the frequency converter remains the same as seen in the course of a half-wave of the AC supply voltage across this half-wave.
  • a pulse width of the control of the switching means or of the frequency converter is changed in the course of a half-wave in a first basic embodiment of the invention. This is done by making a pulse width of a first switching means shorter and a pulse width of another second switching means longer by the half-time of a half-wave. In the second half of the half-wave, the pulse widths are again changed so that they are the same length again until the end of the half-wave.
  • the sum of the pulse widths (G1, G2) remains the same.
  • the change may be unbalanced at half time.
  • a change in the pulse widths is carried out symmetrically at half-time.
  • a frequency converter or the power supply for the induction heating device may have a series resonant circuit. This consists of an induction coil for power transmission, resonant circuit capacitors and a half-bridge with switchable switching means. Such series resonant circuits are basically known for induction heating devices.
  • the change in the pulse widths can be 10% to 40%.
  • Particularly advantageous pulse widths are changed a maximum of 25%, so shortened or extended.
  • both pulse widths are shortened in all or in two existing in a series resonant circuit switching means such that the dead times are extended in between. This also takes place in the course of a half-wave, whereby the dead times become longer until the half-time of the half-wave and then shorter again. In these dead times none of the switching means is driven.
  • a change in the dead times is advantageously at a maximum of 100%, ie a maximum of doubling the dead times between the shortest dead time and the longest dead time. Particularly advantageously, the maximum change is somewhat lower, for example at 50% to 80%.
  • the power at the induction coil can be reduced somewhat to reduce harmonics and thus reduce network perturbations.
  • a shortening of the switch-on times or pulse widths of the switching means takes place, as well as the extension of the dead times, advantageously symmetrically to the half-time of the half-wave. So a uniform control and power generation is possible.
  • a change of a pulse width or a dead time over a mains half-wave takes place as evenly as possible or distributed.
  • a distribution may be such that the change of the pulse width or the dead time substantially corresponds to a sinusoidal curve.
  • An aforementioned arrangement thus has a frequency converter with a resonant circuit which is constructed from the induction coil, resonant circuit capacitors and a half-bridge with switchable switching means. Furthermore, a drive device for the switching means is provided, wherein the operating frequency or the switch-on times of the switching means can be influenced. In particular, so that the pulse widths or the dead times can be changed as mentioned above, wherein the operating frequency is equal and a pulse width shortened or a dead time is extended.
  • FIG. 2 an arrangement or circuit arrangement 11 according to the invention is shown.
  • a controller 13 controls a frequency converter 15 on with two switching means T 1 and T 2 , for example transistors. These form together with a DC link capacitor C 2 and resonant circuit capacitors C s the drive for the induction coil L.
  • the operating frequency for the switching means T 1 and T 2 and thus the frequency converter 15 is mainly specified.
  • the pulse widths G and the dead times H are given.
  • 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 pulse width G and the dead times H of the frequency converter 15 and the switching means T 1 and T 2 is not particularly high. In particular, if their courses are given fixed or controlled by a control process, the effort is limited because you can work with predetermined progressions.
  • Fig. 3 are in a diagram, the pulse widths G1 and G2 and the dead times H1 and H2 of the transistors T1 and T2 after Fig. 2 at a time near or at the net zero crossing. It can be seen from this that both the pulse widths G1 and G2 take the same length. Likewise, the intermediate dead times H1 and H2 are also the same length at this time.
  • Fig. 4 are the pulse widths changed according to the aforementioned first basic embodiment of the invention. This means that with the same dead times H1 and H2, the pulse widths at transistor T1, ie G1, have become shorter, in this case shortened by about 25% near the peak of a network half-wave.
  • the pulse widths G2 on the transistor T2 have been extended by about 25%.
  • the change in pulse width G1 is as out Fig. 6 can be seen, in turn, itself a sinusoidal curve or has a sinusoidal course.
  • the minimum pulse width G1 is found at the middle or high point of a network half-wave.
  • the course G2, which is not shown, results from mirroring the profile for G1 on a line which runs horizontally through the maximum values for G1 in such a way that the sum (G1 + G2) is always constant.
  • Fig. 5 is shown according to the second basic embodiment of the invention, as deviating from Fig. 4 Although the pulse widths G1 and G2 remain the same, but the dead times H1 and H2 are changed in between.
  • the dead times H1 and H2, ie before the respective pulse width G1 and G2, are compared to Fig. 3 extended by about 60%.
  • the schematic for H1 from Fig. 6 and at the same time is the one for H2.
  • both basic embodiments of the invention can be used together.
  • the change in the pulse width or the dead time should be as analog or mirror-symmetrical as possible or in small steps over a mains half-wave.
  • the formation of harmonics can be reduced or avoided, and on the other hand, it is possible to avoid noise generation as a result of resulting jumps in performance.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Inverter Devices (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)

Abstract

In order to increase the power of an induction heating device or in order to avoid system reactions when driving the latter, either the pulse widths of the two switching means can be made unsymmetrical in the case of half-bridge driving up to the half-point of a half-cycle. Alternatively, a dead time between the pulse width can be extended. This advantageously takes place without interruption and continuously. In the course of a half-cycle, the power is thus reduced given an unaltered operating frequency and an inductor current has virtually an ideal sine-wave form.

Description

Die Erfindung betrifft ein Verfahren zur Leistungsversorgung einer Induktionsheizeinrichtung sowie eine Anordnung zur Leistungsversorgung einer Induktionsheizeinrichtung.The invention relates to a method for supplying power to an induction heating device and to an arrangement for supplying power to an induction heating device.

Derartige Induktionsheizeinrichtungen werden beispielsweise als Induktionsspulen 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 used for example as induction coils in induction hobs. 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, of the third harmonic lies essentially in the fact that the permeability of the magnetic components in the frequency converter changes with the amplitude of the inductor current flowing through the induction coil. 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.

Lösungen für solche Induktionsheizeinrichtungen bzw. Verfahren zu ihrer Versorgung sind beispielsweise in der nicht offengelegten DE 10 2005 028 829.4 derselben Anmelderin beschrieben. Dort wird zur Vermeidung von Netzrückwirkungen eine Arbeitsfrequenz der Schaltmittel bzw. des gesamten Frequenzumrichters im Verlauf einer Halbwelle erhöht und dann wieder abgesenkt. Diese Änderung der Arbeitsfrequenz ist jedoch steuerungstechnisch aufwendig.Solutions for such Induktionsheizeinrichtungen or methods for their supply, for example, in the unpublished DE 10 2005 028 829.4 the same applicant described. There is an operating frequency of the switching means or the entire frequency in the course of a half-wave increases and then lowered again to avoid network perturbations. However, this change in the operating frequency is expensive control technology.

Aufgabe und LösungTask and solution

Der Erfindung liegt die Aufgabe zugrunde, ein eingangs genanntes Verfahren sowie eine dazu geeignete Anordnung zu schaffen, mit denen Probleme des Standes der Technik vermieden werden können und insbesondere ohne Änderung der Arbeitsfrequenz bei höheren Leistungen bei Induktionsheizeinrichtungen Netzrückwirkungen bzw. Verzerrungen der Stromaufnahme aus dem Versorgungsnetz reduziert werden können.The invention has for its object to provide an initially mentioned method and a suitable arrangement with which problems of the prior art can be avoided and in particular reduced without changing the operating frequency at higher power at induction heaters network interference or distortion of power consumption from the supply network can be.

Gelöst wird diese Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1, eine Anordnung mit den Merkmalen des Anspruchs 9 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. Manche der nachfolgend aufgezählten Merkmale und Eigenschaften treffen sowohl auf das Verfahren als auch auf die Anordnung oder die Anwendung zu. Sie werden teilweise nur einmal beschrieben, gelten jedoch unabhängig voneinander sowohl für das Verfahren als auch die Anordnung sowie die Anwendung. 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, an arrangement having the features of claim 9 and the application of said method for an induction hob or an induction heater. Advantageous and preferred embodiments of the invention are the subject of the other claims and are explained in more detail below. Some of the features and properties listed below apply to both the method and the arrangement or application. They are described in part only once, but apply independently for both the method and the arrangement and the application. The wording of the claims is incorporated herein by express reference.

Zur Leistungsversorgung der Induktionsheizeinrichtung dient eine Wechsel-Versorgungsspannung. Des Weiteren ist ein Frequenzumrichter vorgesehen mit schaltbaren Schaltmitteln. Eine Arbeitsfrequenz dieser Schaltmittel bzw. des Frequenzumrichters bleibt dabei im Verlauf einer Halbwelle der Wechsel-Versorgungsspannung über diese Halbwelle gesehen gleich. Erfindungsgemäß wird bei einer ersten grundsätzlichen Ausgestaltung der Erfindung eine Pulsweite der Ansteuerung der Schaltmittel bzw. des Frequenzumrichters im Verlauf einer Halbwelle geändert. Dies erfolgt dadurch, dass bis zur Halbzeit einer Halbwelle eine Pulsweite eines ersten Schaltmittels kürzer und eine Pulsweite eines anderen zweiten Schaltmittels länger gemacht wird. In der zweiten Halbzeit der Halbwelle werden die Pulsweiten wiederum so verändert, dass sie bis zum Ende der Halbwelle wieder gleich lang sind. Bevorzugt bleibt die Summe der Pulsweiten (G1, G2) gleich. Die Veränderung kann zwar unsymmetrisch zu der Halbzeit erfolgen. Vorteilhaft wird jedoch eine Veränderung der Pulsweiten symmetrisch zur Halbzeit durchgeführt.To supply power to the induction heater is an AC supply voltage. Furthermore, a frequency converter is provided with switchable switching means. An operating frequency of this switching means or of the frequency converter remains the same as seen in the course of a half-wave of the AC supply voltage across this half-wave. According to the invention, a pulse width of the control of the switching means or of the frequency converter is changed in the course of a half-wave in a first basic embodiment of the invention. This is done by making a pulse width of a first switching means shorter and a pulse width of another second switching means longer by the half-time of a half-wave. In the second half of the half-wave, the pulse widths are again changed so that they are the same length again until the end of the half-wave. Preferably, the sum of the pulse widths (G1, G2) remains the same. The change may be unbalanced at half time. Advantageously, however, a change in the pulse widths is carried out symmetrically at half-time.

Ein Frequenzumrichter bzw. die Leistungsversorgung für die Induktionsheizeinrichtung kann einen Serienschwingkreis aufweisen. Dieser besteht aus einer Induktionsspule für die Leistungsübertragung, Schwingkreiskondensatoren und einer Halbbrücke mit schaltbaren Schaltmitteln. Derartige Serienschwingkreise sind für Induktionsheizeinrichtungen grundsätzlich bekannt.A frequency converter or the power supply for the induction heating device may have a series resonant circuit. This consists of an induction coil for power transmission, resonant circuit capacitors and a half-bridge with switchable switching means. Such series resonant circuits are basically known for induction heating devices.

So ist es möglich, durch Änderung des Pulsweitenverhältnisses in Abhängigkeit des Verlaufs der Halbwelle der Entstehung von Oberwellen entgegenzuwirken. Insofern kann dadurch bei unveränderter Arbeitsfrequenz die Leistung reduziert werden, wodurch ein in einem Schwingkreis der Leistungsversorgung fließender Strom proportional zur Wechsel-Versorgungsspannung gehalten werden kann. So werden die Netzrückwirkungen vermindert und es sind insgesamt höhere Leistungen für die Induktionsheizeinrichtung möglich.Thus, it is possible to counteract the formation of harmonics by changing the pulse width ratio as a function of the course of the half-wave. In this way, the power can be reduced while maintaining the operating frequency, whereby a current flowing in a resonant circuit of the power supply current can be kept proportional to the AC supply voltage. Thus, the network perturbations are reduced and it is possible higher overall performance for the induction heating.

In vorteilhafter Ausgestaltung der Erfindung kann die Änderung der Pulsweiten 10% bis 40% betragen. Besonders vorteilhaft werden die Pulsweiten maximal 25% geändert, also verkürzt oder verlängert.In an advantageous embodiment of the invention, the change in the pulse widths can be 10% to 40%. Particularly advantageous pulse widths are changed a maximum of 25%, so shortened or extended.

Bei einer zweiten grundsätzlich Ausgestaltung der Erfindung werden bei allen bzw. bei zwei in einem Serienschwingkreis vorhandenen Schaltmitteln beide Pulsweiten derart verkürzt, dass die Totzeiten dazwischen verlängert werden. Auch dies erfolgt im Verlauf einer Halbwelle, wobei bis zur Halbzeit der Halbwelle die Totzeiten länger werden und danach wieder kürzer. In diesen Totzeiten ist keines der Schaltmittel angesteuert. Eine Änderung der Totzeiten liegt vorteilhaft bei maximal 100%, also maximal eine Verdoppelung der Totzeiten zwischen kürzester Totzeit und längster Totzeit. Besonders vorteilhaft liegt die maximale Änderung etwas darunter, beispielsweise bei 50% bis 80%.In a second basic embodiment of the invention, both pulse widths are shortened in all or in two existing in a series resonant circuit switching means such that the dead times are extended in between. This also takes place in the course of a half-wave, whereby the dead times become longer until the half-time of the half-wave and then shorter again. In these dead times none of the switching means is driven. A change in the dead times is advantageously at a maximum of 100%, ie a maximum of doubling the dead times between the shortest dead time and the longest dead time. Particularly advantageously, the maximum change is somewhat lower, for example at 50% to 80%.

Auch durch die Verlängerung der Totzeiten zwischen den Pulsen für die Schaltmittel kann die Leistung an der Induktionsspule etwas verringert werden zur Reduzierung von Oberwellen und somit zur Reduzierung von Netzrückwirkungen.Also, by extending the dead times between the pulses for the switching means, the power at the induction coil can be reduced somewhat to reduce harmonics and thus reduce network perturbations.

Eine Verkürzung der Einschaltzeiten bzw. Pulsweiten der Schaltmittel erfolgt ebenso wie die Verlängerung der Totzeiten vorteilhaft symmetrisch zur Halbzeit der Halbwelle. So ist eine gleichmäßige Ansteuerung und Leistungserzeugung möglich.A shortening of the switch-on times or pulse widths of the switching means takes place, as well as the extension of the dead times, advantageously symmetrically to the half-time of the half-wave. So a uniform control and power generation is possible.

In weiterer besonders bevorzugter Ausgestaltung der Erfindung ist vorgesehen, dass eine Änderung einer Pulsweite oder einer Totzeit über eine Netzspannungshalbwelle möglichst gleichmäßig bzw. verteilt erfolgt. Insbesondere kann eine derartige Verteilung so sein, dass die Änderung der Pulsweite oder der Totzeit im Wesentlichen einem sinusartigen Kurvenverlauf entspricht.In a further particularly preferred embodiment of the invention, it is provided that a change of a pulse width or a dead time over a mains half-wave takes place as evenly as possible or distributed. In particular, such a distribution may be such that the change of the pulse width or the dead time substantially corresponds to a sinusoidal curve.

In weiterer bevorzugter Ausgestaltung der Erfindung wird für eine Änderung der Einschaltzeiten, der Pulsweiten oder der Totzeiten der Schaltmittel lediglich eine Steuerung vorgesehen und keine Regelung. Dadurch kann die Rückkopplung für eine Regelungsschleife entfallen und der Aufwand, insbesondere der Beschattungsaufwand, ist erheblich geringer.In a further preferred embodiment of the invention, only one control is provided for a change in the switch-on, the pulse widths or the dead times of the switching means and no control. This eliminates the feedback for a control loop and the effort, in particular the shading effort is considerably lower.

Eine vorgenannte Anordnung weist also einen Frequenzumrichter auf mit einem Schwingkreis, der aus der Induktionsspule, Schwingkreiskondensatoren und einer Halbbrücke mit schaltbaren Schaltmitteln aufgebaut ist. Des Weiteren ist eine Ansteuereinrichtung für die Schaltmittel vorgesehen, wobei die Arbeitsfrequenz bzw. die Einschaltzeiten der Schaltmittel beeinflusst werden können. Insbesondere können damit die Pulsweiten oder die Totzeiten wie vorgenannt verändert werden, wobei die Arbeitsfrequenz gleichgelassen wird und eine Pulsweite verkürzt oder eine Totzeit verlängert wird.An aforementioned arrangement thus has a frequency converter with a resonant circuit which is constructed from the induction coil, resonant circuit capacitors and a half-bridge with switchable switching means. Furthermore, a drive device for the switching means is provided, wherein the operating frequency or the switch-on times of the switching means can be influenced. In particular, so that the pulse widths or the dead times can be changed as mentioned above, wherein the operating frequency is equal and a pulse width shortened or a dead time is extended.

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.

Kurzbeschreibung der ZeichnungenBrief description of the drawings

Ausführungsbeispiele der Erfindung sind in den Zeichnungen im Wesentlichen schematisch dargestellt und werden im Folgenden näher erläutert. In den Zeichnungen zeigt:

Fig. 1
die Verläufe der Impedanz der Induktionsspule, der Betriebsspannung, der Amplitude des Induktorstromes, der Pulsweiten und der Totzeiten über der Zeit gemäß dem Stand der Technik,
Fig. 2
ein Schaltbild einer Anordnung zur Leistungsversorgung einer Induktionsspule gemäß der Erfindung,
Fig. 3
die Verläufe der Pulsweiten und der Totzeiten nahe dem Nulldurchgang ohne Veränderung,
Fig. 4
die Verläufe ähnlich Fig. 3 nahe dem Hochpunkt einer Halbwelle mit geänderten Pulsweiten,
Fig. 5
die Verläufe ähnlich Fig. 3 nahe dem Hochpunkt einer Halbwelle mit geänderten Totzeiten und
Fig. 6
die zeitlichen Verläufe der Impedanz der Induktionsspule, der Betriebsspannung, der Amplitude des Induktorstromes, der Pulsweiten und der Totzeiten gemäß der Erfindung.
Embodiments of the invention are shown in the drawings substantially schematically and will be explained in more detail below. In the drawings shows:
Fig. 1
the characteristics of the impedance of the induction coil, the operating voltage, the amplitude of the inductor current, the pulse widths and the dead times 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,
Fig. 3
the waveforms of the pulse widths and the dead times near the zero crossing without change,
Fig. 4
the courses are similar Fig. 3 near the peak of a half wave with changed pulse widths,
Fig. 5
the courses are similar Fig. 3 near the high point of a half wave with changed dead times and
Fig. 6
the time courses of the impedance of the induction coil, the operating voltage, the amplitude of the inductor current, the pulse widths and the dead times according to the invention.

Detaillierte Beschreibung der AusführungsbeispieleDetailed description of the embodiments

In Fig. 1 ist für bekannte Verfahren der Verlauf der Betriebsspannung Ub, der Impedanz Z = w·L der Induktionsspule L, des Induktorstromes IL, der Arbeitsfrequenz f von beispielsweise etwa 20kHz, der Pulsweite G und der Totzeiten H über der Zeit dargestellt. Es ist zu erkennen, wie bei konstanter Arbeitsfrequenz f der Verlauf des Induktorstromes IL von dem der Betriebsspannung Ub abweicht, insbesondere weicht er von der Sinusform ab. Dies führt zu den erwähnten negativen Netzrückwirkungen.In Fig. 1 For known methods, the profile of the operating voltage U b , the impedance Z = w · L of the induction coil L, the inductor current I L , the operating frequency f of, for example, about 20 kHz, the pulse width G and the dead times H over time are shown. It can be seen how at constant operating frequency f the course of the inductor current I L deviates from that of the operating voltage U b , 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. So werden auch die Pulsweiten G und die Totzeiten H vorgegeben.In Fig. 2 an arrangement or circuit arrangement 11 according to the invention is shown. A controller 13 controls a frequency converter 15 on with two switching means T 1 and T 2 , for example transistors. These form together with a DC link capacitor C 2 and resonant circuit capacitors C s the drive for the induction coil L. Above the control 13, the operating frequency for the switching means T 1 and T 2 and thus the frequency converter 15 is mainly specified. Thus, the pulse widths G and the dead times H are given.

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 Pulsweiten G und der Totzeiten H des Frequenzumrichters 15 bzw. der Schaltmittel T1 und T2 ist dabei nicht besonders hoch. Insbesondere dann, wenn deren Verläufe fest vorgegeben bzw. mit einem Steuervorgang gesteuert vorgegeben werden, hält sich der Aufwand in Grenzen, da mit vorgegebenen 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 pulse width G and the dead times H of the frequency converter 15 and the switching means T 1 and T 2 is not particularly high. In particular, if their courses are given fixed or controlled by a control process, the effort is limited because you can work with predetermined progressions.

In Fig. 3 sind in einem Diagramm die Pulsweiten G1 und G2 sowie die Totzeiten H1 und H2 der Transistoren T1 und T2 nach Fig. 2 zu einem Zeitpunkt in der Nähe bzw. am Netznulldurchgang dargestellt. Daraus ist zu erkennen, dass sowohl die Pulsweiten G1 als auch G2 gleich lang dauern. Ebenso sind die dazwischenliegenden Totzeiten H1 und H2 ebenfalls gleich lang zu diesem Zeitpunkt.In Fig. 3 are in a diagram, the pulse widths G1 and G2 and the dead times H1 and H2 of the transistors T1 and T2 after Fig. 2 at a time near or at the net zero crossing. It can be seen from this that both the pulse widths G1 and G2 take the same length. Likewise, the intermediate dead times H1 and H2 are also the same length at this time.

In Fig. 4 sind gemäß der vorgenannten ersten grundsätzlichen Ausgestaltung der Erfindung die Pulsweiten verändert. Dies bedeutet, dass bei gleichen Totzeiten H1 und H2 die Pulsweiten am Transistor T1, also G1, kürzer geworden sind, und zwar hier nahe dem Hochpunkt einer Netzhalbwelle um etwa 25% verkürzt. Die Pulsweiten G2 am Transistor T2 sind um etwa 25% verlängert worden. Durch diese unterschiedlichen Pulsweiten wird ebenfalls die Leistung an der Induktionsspule bei unveränderter Arbeitsfrequenz f etwas reduziert. Die Änderung der Pulsweiten G1 ist, wie aus Fig. 6 zu entnehmen ist, selber wiederum eine sinusartige Kurve bzw. hat einen sinusartigen Verlauf. Die minimale Pulsweite G1 findet sich jeweils am Mittel- bzw. Hochpunkt einer Netzhalbwelle. Der nicht dargestellte Verlauf G2 ergibt sich durch Spiegeln des Verlaufs für G1 an einer Linie, welche durch die maximalen Werte für G1 horizontal verläuft derart, dass die Summe (G1+G2) stets konstant ist.In Fig. 4 are the pulse widths changed according to the aforementioned first basic embodiment of the invention. This means that with the same dead times H1 and H2, the pulse widths at transistor T1, ie G1, have become shorter, in this case shortened by about 25% near the peak of a network half-wave. The pulse widths G2 on the transistor T2 have been extended by about 25%. Through these different Pulse widths also the power at the induction coil at unchanged operating frequency f is slightly reduced. The change in pulse width G1 is as out Fig. 6 can be seen, in turn, itself a sinusoidal curve or has a sinusoidal course. The minimum pulse width G1 is found at the middle or high point of a network half-wave. The course G2, which is not shown, results from mirroring the profile for G1 on a line which runs horizontally through the maximum values for G1 in such a way that the sum (G1 + G2) is always constant.

In Fig. 5 ist gemäß der zweiten grundsätzlichen Ausgestaltung der Erfindung dargestellt, wie abweichend von Fig. 4 zwar die Pulsweiten G1 und G2 gleich bleiben, jedoch die Totzeiten H1 und H2 dazwischen verändert sind. Die Totzeiten H1 und H2, also vor der jeweiligen Pulsweite G1 und G2, sind im Vergleich zu Fig. 3 um etwa 60% verlängert. Auch hier kann der schematische Verlauf für H1 aus Fig. 6 entnommen werden und ist gleichzeitig derjenige für H2.In Fig. 5 is shown according to the second basic embodiment of the invention, as deviating from Fig. 4 Although the pulse widths G1 and G2 remain the same, but the dead times H1 and H2 are changed in between. The dead times H1 and H2, ie before the respective pulse width G1 and G2, are compared to Fig. 3 extended by about 60%. Again, the schematic for H1 from Fig. 6 and at the same time is the one for H2.

Auch mit diesem Verfahren der Änderung der Totzeiten H kann bei konstanter Arbeitsfrequenz eine sinusförmigere oder genau sinusförmige Stromaufnahme IL erreicht werden. Auch dies kann als Wirkung aus Fig. 6 entnommen werden.Even with this method of changing the dead times H, a sinusoidal or exactly sinusoidal current consumption I L can be achieved at a constant operating frequency. This too can be considered as an effect Fig. 6 be removed.

Es ist selbstverständlich, dass auch beide grundsätzlichen Ausgestaltungen der Erfindung gemeinsam angewendet werden können. In beiden Fällen gilt, dass die Veränderung der Pulsweite oder der Totzeit über einer Netzspannungshalbwelle möglichst analog bzw. spiegelsymmetrisch oder in kleinen Schritten erfolgen sollte. Dadurch kann einerseits die Bildung von Oberwellen reduziert oder vermieden werden und andererseits ist eine Geräuscherzeugung durch entstehende Leistungssprünge vermeidbar.It goes without saying that both basic embodiments of the invention can be used together. In both cases, the change in the pulse width or the dead time should be as analog or mirror-symmetrical as possible or in small steps over a mains half-wave. As a result, on the one hand, the formation of harmonics can be reduced or avoided, and on the other hand, it is possible to avoid noise generation as a result of resulting jumps in performance.

Es kann, wie eingangs genannt worden ist, auf eine Regelung von Pulsweite G und Totzeit H verzichtet werden und dies lediglich mit einer Steuerung durchgeführt werden. So kann der Aufwand gering gehalten werden.It can, as has been mentioned, to dispense with a regulation of pulse width G and dead time H and this can only be done with a controller. So the effort can be kept low.

Claims (10)

  1. Method for supplying power to an induction heating device (L), where an AC supply voltage and a frequency converter (15) with switchable switching means (T1, T2) are provided for supplying power, where a working frequency (f) of the switching means (T1, T2) or of the frequency converter (15) remains the same during the course of a half-wave of the supply voltage (Ub) when seen over the half-wave, characterized in that a pulse width (G) of the actuation of the switching means (T1, T2) or of the frequency converter (15) is altered in the course of a half-wave such that by the half time of the half-wave a pulse width (G1) of a first switching means (T1) is made shorter and a pulse width (G2) of another switching means (T2) is made longer, where the pulse widths (G1, G2) are again of equal length by the end of the halfwaves.
  2. Method according to Claim 1, characterized in that the change in the pulse widths (G) is at most 10% to 40%, preferably at most 25%.
  3. Method according to Claim 1 or 2, characterized in that the dead times (H) between the pulse widths (G) remain the same, where the sum of the pulse widths (G1, G2) preferably remains the same.
  4. Method according to the preamble of Claim 1, characterized in that all, or in the case of two switching means (T1, T2) both, pulse widths (G1, G2) are shortened with longer dead times (H1, H2) between them, where none of the switching means is actuated in the dead times.
  5. Method according to Claim 4, characterized in that the duty cycles or pulse widths (G1, G2) of the switching means (T1, T2) are shortened up to the half time of the half-wave and then become longer again, symmetrically to the half time of the half-wave, until the end of the half-wave.
  6. Method according to Claim 4 or 5, characterized in that the change of the dead times (H1, H2) is at most 10% to 100%, preferably at most 80%.
  7. Method according to one of the preceding claims, characterized in that the change of the duty cycles, dead times (H1, H2) or pulse widths (G1, G2) of the switching means (T1, T2) is achieved without closed-loop control and only by open-loop control.
  8. Method according to one of the preceding claims, characterized in that the change of a pulse width (G1, G2) or of a dead time (H1, H2) takes place over a mains voltage half-wave as evenly or spread out as possible.
  9. Arrangement for supplying power to an induction heating device with a frequency converter (15) having an oscillating circuit with an induction coil (L), oscillating circuit capacitors (Cs) and a half-bridge with switchable switching means (T1, T2), where an actuation device (13) for actuating the switching means (T1, T2) is provided with a working frequency (f) for each, where the actuation device (13) is designed for changing the pulse widths (G1, G2) or dead times (H1, H2) such that with a constant working frequency (f) a pulse width is shortened or a dead time is prolonged at least temporarily.
  10. Application of the method according to one of Claims 1 to 8 for an induction hotplate with at least one induction heating device or for an induction heating device (L).
EP07801786A 2006-08-25 2007-08-21 Method and arrangement for supplying power to an induction heating device Active EP2055144B1 (en)

Priority Applications (2)

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SI200730166T SI2055144T1 (en) 2006-08-25 2007-08-21 Method and arrangement for supplying power to an induction heating device
PL07801786T PL2055144T3 (en) 2006-08-25 2007-08-21 Method and arrangement for supplying power to an induction heating device

Applications Claiming Priority (2)

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DE102006041964A DE102006041964A1 (en) 2006-08-25 2006-08-25 Method and arrangement for supplying power to an induction heater
PCT/EP2007/007350 WO2008022765A1 (en) 2006-08-25 2007-08-21 Method and arrangement for supplying power to an induction heating device

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EP (1) EP2055144B1 (en)
JP (1) JP5021743B2 (en)
CN (1) CN101507351B (en)
AT (1) ATE456285T1 (en)
CA (1) CA2659168A1 (en)
DE (2) DE102006041964A1 (en)
ES (1) ES2339721T3 (en)
PL (1) PL2055144T3 (en)
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US20100172167A1 (en) * 2009-01-08 2010-07-08 Yang Ye Method and apparatus of an improvement in pwm switching patterns
EP2328384B1 (en) * 2009-11-27 2017-03-15 Electrolux Home Products Corporation N.V. An induction hob and a method for controlling an induction hob
CN104902600B (en) * 2014-03-06 2018-03-16 美的集团股份有限公司 Electromagnetic heater and its control method
ES2673132B1 (en) * 2016-12-19 2019-03-28 Bsh Electrodomesticos Espana Sa Induction cooking appliance device.
CN108738179B (en) * 2017-04-14 2021-06-18 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating device and control method thereof
WO2019024970A1 (en) * 2017-08-02 2019-02-07 Diehl Ako Stiftung & Co. Kg Induction heating device
CN109688649B (en) * 2017-10-19 2021-02-26 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating equipment, electromagnetic heating system and control method and device thereof
WO2024046629A1 (en) * 2022-08-30 2024-03-07 BSH Hausgeräte GmbH Cooking appliance

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US6528770B1 (en) * 1999-04-09 2003-03-04 Jaeger Regulation Induction cooking hob with induction heaters having power supplied by generators
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DE102005028829A1 (en) 2005-06-14 2007-01-11 E.G.O. Elektro-Gerätebau GmbH Method and arrangement for supplying power to an induction heater

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CA2659168A1 (en) 2008-02-28
PL2055144T3 (en) 2010-06-30
ATE456285T1 (en) 2010-02-15
CN101507351B (en) 2012-02-15
DE102006041964A1 (en) 2008-04-03
US20090160413A1 (en) 2009-06-25
DE502007002692D1 (en) 2010-03-11
US7688601B2 (en) 2010-03-30
ES2339721T3 (en) 2010-05-24
CN101507351A (en) 2009-08-12
JP5021743B2 (en) 2012-09-12
JP2010501973A (en) 2010-01-21
WO2008022765A1 (en) 2008-02-28
SI2055144T1 (en) 2010-03-31
EP2055144A1 (en) 2009-05-06

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