EP2127478B2 - Plaque de cuisson à induction - Google Patents

Plaque de cuisson à induction Download PDF

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Publication number
EP2127478B2
EP2127478B2 EP07703206.8A EP07703206A EP2127478B2 EP 2127478 B2 EP2127478 B2 EP 2127478B2 EP 07703206 A EP07703206 A EP 07703206A EP 2127478 B2 EP2127478 B2 EP 2127478B2
Authority
EP
European Patent Office
Prior art keywords
alternating current
frequency alternating
oscillatory circuit
cookware
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07703206.8A
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German (de)
English (en)
Other versions
EP2127478B1 (fr
EP2127478A1 (fr
Inventor
Christian Breuninger
Albrecht Eiber
Martin Neumayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WMF Group GmbH
Original Assignee
WMF Group GmbH
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Filing date
Publication date
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Application filed by WMF Group GmbH filed Critical WMF Group GmbH
Publication of EP2127478A1 publication Critical patent/EP2127478A1/fr
Application granted granted Critical
Publication of EP2127478B1 publication Critical patent/EP2127478B1/fr
Publication of EP2127478B2 publication Critical patent/EP2127478B2/fr
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like

Definitions

  • the invention relates to an induction hob and a method for inductive heating of cookware according to the preambles of claims 1 and 7.
  • An induction hob has an induction coil, which is traversed by a high-frequency alternating current.
  • the usual way applied induction frequencies are in a range of about 25 - 50 kHz.
  • a converter usually converts the low-frequency mains current into a high-frequency alternating current.
  • the induction coil is usually located below an existing example of glass ceramic cooktop.
  • the current-carrying induction coil generates a magnetic alternating field.
  • the alternating magnetic field induces strong eddy currents in a ferromagnetic material (eg chromium steel) of cookware, which leads to rapid heating of the material.
  • the eddy currents flow only in a thin surface layer of the soil.
  • the bottom of an induction cookware consists of a ferromagnetic layer and outside the penetration depth of the eddy currents of a thermally conductive material for better heat (transverse) distribution.
  • induction hobs compared to conventional hobs are the very short reaction time with changes in setting, a relatively cool cooking plate, energy spas, especially with short cooking times and low prices.
  • induction hobs also have disadvantages.
  • a disadvantage is z. B. in that cookware can develop disturbing vibrations that are in the audible frequency range, which leads to a disturbing noise or hum. So far, it has been assumed that the natural frequencies of the cookware are crucial, as they can lead to large amplitudes and thus to high noise. When noise is to distinguish between cause and effect. The cause of the noise is the excitation of the cookware by the hob, the effect shows the cookware by the noise emission by mechanical vibrations. Measures on the cookware, such as shifting the resonance frequencies or vibration damping measures, such as attaching a rubber band o. ⁇ . Around the circumference of a cookware, have brought no significant improvements.
  • the present invention seeks to provide an induction hob and a method that reduce or eliminate the noise of cooking utensils on induction hobs.
  • the induction hob comprises a generator means, which in turn comprises means for smoothing or eliminating amplitude modulation of the high frequency alternating current flowing through the coil.
  • means for smoothing or eliminating amplitude modulation means that on the one hand a generated amplitude modulation is smoothed out or eliminated, or even not generated when the induction hob is operated with mains current.
  • the reaction of the cookware is not based solely on the high frequency resonant circuit frequency for generating the magnetic field, but is due to vibration overlays, which lead to the amplitude modulation, which forms the envelope of the induction frequency.
  • This envelope does not have to be symmetrical, but may also be skewed, and / or superimposed with other harmonic frequencies discontinuous, etc.
  • the high-frequency alternating current is not amplitude modulated, or the amplitude modulation of the high-frequency alternating current is smoothed or eliminated, the excitation of the cookware and thus its noise emission is reduced or prevented
  • the noise problem can be solved in a simple manner become.
  • the generator device may comprise an AC rectifier and a resonant circuit generator.
  • the AC rectifier generates DC power from the low frequency mains power.
  • the means for smoothing or eliminating are associated with the AC rectifier such that the unsmoothed DC current generated by the AC rectifier is smoothed. Consequently a cause for the amplitude modulation of the high-frequency alternating current is eliminated because the resonant circuit no low-frequency components are supplied from the power supply forth.
  • the resonant circuit generator has a resonant circuit control circuit, wherein the power control is performed such that low-frequency oscillations in the resonant circuit are avoided.
  • the power control is performed such that low-frequency oscillations in the resonant circuit are avoided.
  • low-frequency vibrations from the power control / regulation in the resonant circuit can be avoided, for example by means of suitable control algorithms.
  • the amplitude modulation of the high-frequency alternating current can also be smoothed or eliminated by a corresponding circuit technology in the resonant circuit generator.
  • the power control may be such as to compensate for the amplitude variations due to a non-smoothed direct current. This can be done for example by a pulse width control or regulation in the resonant circuit.
  • the means for smoothing or eliminating have a smoothing factor of 70-100%. If the smoothing factor is 100%, then the amplitude modulation is 0. The high-frequency alternating current then lies between two parallel lines. If there is no smoothing, the envelope has periodic zero crossings. If the smoothing factor is greater than 0%, there are no periodically occurring zero point crossings in the envelope, so that the humming can be significantly reduced here as well.
  • the cookware is caused by the alternating magnetic field in such a vibration that there is no or only little noise.
  • FIG. 1 shows an induction hob according to the present invention.
  • the induction hob 1 has a cooking surface 2, which is formed for example of glass ceramic. On this cooking surface is here a saucepan 10, at least in the lower, thin edge layer 11 of ferromagnetic material, for. B. chrome steel is formed. Outside the penetration depth of eddy currents, the cooking pot 10 may be formed of a more thermally conductive material for better heat distribution be.
  • an induction coil 3 is arranged below the cooking surface 2.
  • the induction coil 3 is supplied with high-frequency alternating current, so that a high-frequency alternating magnetic field 12 is generated.
  • the resulting alternating magnetic field 12 induced in the lower thin edge layer 11 of the bottom of the pot 10 eddy currents, which lead to the rapid heating of the material.
  • the induction field according to the invention comprises a generator device 4 for generating the high-frequency alternating current, which is supplied to the coil 3.
  • the generator device 4 comprises, for example, as in the FIGS. 11 and 12 is shown, an AC rectifier 20, which converts the AC power from the grid into a DC power.
  • the AC rectifier can, for. B. also have a bridge circuit.
  • the generator device 4 also includes a resonant circuit generator 8 with a corresponding resonant circuit control / control and means 5 for smoothing or eliminating an amplitude modulation, as will be explained in more detail below.
  • the resonant circuit generator 8 generates the high-frequency alternating current in a known manner, wherein the oscillator circuit / control 21 performs a power control (regulation), for example, can be used as a controlled variable or reference variable, the amplitude curve of the coil drive or the power consumption of the coil.
  • a power control regulation
  • FIG. 2 schematically shows the envelope of the amplitude-modulated alternating current of the induction coil according to the prior art.
  • Fig. 2 the amount of amplitude is shown as an envelope over time.
  • the frequency of the amplitude modulation can here z. B. 50 Hz and multiples thereof.
  • the induction frequency at which the coil oscillates corresponds to the frequency of the high-frequency alternating current flowing through the coil.
  • the induction frequency is high frequency z. B.> 20 kHz while the envelope of the current or line amplitudes low frequency eg significantly ⁇ 20 kHz and thus comes into the human hearing.
  • the reaction of the cookware is not based solely on the induced induction frequency, but on the superimposed frequency, d. H. the amplitude modulation, which forms the envelope of the periodically changing amplitudes.
  • This envelope need not be symmetrical, but may also be skewed, and / or superimposed with other harmonic frequencies, unsteady, etc.
  • FIG. 3 the pot reaction is shown as a function of induction excitation. How clear FIG. 3 As can be seen, the pot or cookware 10 is also periodically excited in response to the amplitude modulation to vibrate. This periodic excitation is the cause of the noise. In FIG. 3 the pot reaction is shown hatched, wherein the amplitude modulated AC, the in FIG. 2 shown alternating current corresponds. The vibration frequency of the cookware contains many frequency components up to the induction frequency. The emitted sound in the audible range also contains a broad frequency spectrum.
  • FIG. 4 shows the envelopes of the measured alternating field 12 and the measured movements with which the cookware 10 oscillates.
  • the dotted lines show the vibration behavior of the cookware, while the solid lines show the envelope of the amplitude-modulated induction excitation.
  • the oscillation response of a commercial pot was here measured by laser Doppler vibrometry in a range up to 70 kHz.
  • FIG. 5 shows the spectral content of the induction excitation and the vibrations of the cookware Fig. 4 , wherein the induction frequencies in solid lines, and the cookware frequencies are shown in dashed lines.
  • the resonant circuit frequency for generating the alternating current is not included.
  • the vibration response is shown here up to a range up to 1500 Hz.
  • the amplitude modulation is smoothed or completely eliminated. The higher the smoothing factor, the lower the excitation of the cookware. Therefore, according to the present invention, means 5 are provided for smoothing or eliminating amplitude modulation of the high frequency induction excitation of the well by the coil. This means that the amplitude modulation of the high-frequency alternating current flowing through the induction coil 3 is smoothed or eliminated or not even generated.
  • FIG. 6a shows a schematic representation of a partial smoothing of the envelope, for example, the voltage / power amplitude or current amplitude in the resonant circuit.
  • the smoothing factor is in a range of 70 to 100%. But even at lower smoothing factors a noise reduction is noticeable.
  • FIGS. 6b and 7b The magnetic field was measured as a function of time Fig. 6 shown measuring arrangement performed.
  • a conductor loop 30 between cooking surface 2 and bottom of the pot was inserted.
  • a commercial saucepan eg Topstar WMF
  • the conductor loop had a diameter of 7 cm.
  • the conductor loop is induced by the magnetic alternating field between the stove and pot a voltage which was measured.
  • the pot reaction is represented as a function of time by the movement, measured by means of laser Doppler vibrometry, with which the pot oscillates.
  • the mechanical vibration of the pot with the in Fig. 6 Laser Doppler Vibrometer (LDV) is measured, which detects a punctual speed of the pot edge in the upper region in the horizontal direction.
  • LDV Laser Doppler Vibrometer
  • the smoothing factor is around 70%.
  • the smoothing factor is 100%.
  • the pot reaction is even lower with a complete smoothing than with a smoothing factor of 70%. According to the invention, even a smoothing factor of 70% can reduce the pot reaction so much that the noise emission is significantly reduced.
  • means 5 for smoothing or eliminating amplitude modulation of the high-frequency alternating current must prevent low-frequency oscillation components from occurring in the resonant circuit, since the pot, as explained above, performs the mechanical oscillations analogously to the amplitude-modulated electrical excitation.
  • the means 5 for smoothing the 2-phase or 3-phase alternating current in the form of a capacitor 5 are already assigned to the AC rectifier.
  • the resonant circuit generator 8, which also includes the resonant circuit control / controller 21, can be assigned a further smoothing means 5, such as smoothing capacitors, filters, etc., which smooth out or eliminate the amplitude modulation.
  • the power control in the resonant circuit can also be carried out in such a way that low-frequency oscillations in the resonant circuit are avoided, which can be achieved, for example, by appropriate control algorithms with suitable software.
  • the amplitude modulation of the high-frequency alternating current can be prevented or the amplitude modulation of the high-frequency alternating current are at least smoothed, z. B. as in FIG. 9b shown.
  • FIG. 12 is another possible embodiment of the present invention.
  • FIG. 12 corresponds essentially to the embodiment in FIG. 11 with the exception that here the AC rectifier 20 is assigned no means 5 for smoothing or eliminating the amplitude modulation.
  • the rectified current generated by the AC rectifier 20 has periodically occurring fluctuations which can reach zero. These fluctuations are allowed. There is, for example, a subsequent compensation by including these fluctuations in the power control / regulation of the resonant circuit, z. B. by a pulse width control in the resonant circuit.
  • FIG. 13 Another embodiment is for example in FIG. 13 shown, in which a DC power source is used as the power source.
  • the means 5 are realized here by the DC power source. Any necessary means 5 are then assigned to the resonant circuit generator or the resonant circuit control / control, so that there is no amplitude modulation of the high-frequency alternating current here.
  • FIG. 10 shows an example of the amplitude variation of the alternating current, which is then supplied to the resonant circuit generator 8.
  • the compensation of the now signed fluctuations is realized by the resonant circuit generator and the power control in the resonant circuit, as described above, by appropriate circuit technology in the resonant circuit or by a corresponding control of the resonant circuit.
  • FIGS. 11 to 13 Possible embodiments shown are only examples of how a suitable high-frequency alternating current can be generated, which does not produce buzzing in the cookware. However, it is essential only that the generator device generates a high-frequency alternating current which flows through the coil 3, which has no amplitude modulation, or else a smoothed one Amplitude modulation, as in the FIGS. 6 and 7 is shown. Thus, the noise of cooking utensils depending on the smoothing factor can be reduced or completely avoided.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
  • General Induction Heating (AREA)
  • Dry Shavers And Clippers (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Surgical Instruments (AREA)
  • Induction Heating Cooking Devices (AREA)

Claims (11)

  1. Plaque de cuisson à induction (1) pour chauffer par induction une casserole (10)
    - avec une bobine d'induction (3) alimentée par un courant alternatif à haute fréquence pour produire l'énergie électromagnétique de chauffage
    - et avec un dispositif générateur (4) pour produire le courant alternatif à haute fréquence,
    caractérisée en ce que le dispositif générateur (4) comprend, pour réduire le ronflement de la casserole, un moyen (5) de lissage ou d'élimination d'une modulation d'amplitude du courant alternatif à haute fréquence, et
    le moyen (5) lisse la modulation d'amplitude du courant alternatif à haute fréquence avec un facteur de lissage d'environ 70 à 100 %.
  2. Plaque de cuisson à induction (1) selon la revendication 1, caractérisée en ce que le dispositif générateur (4) comprend un redresseur de courant alternatif (20) et un générateur à circuit oscillant (8).
  3. Plaque de cuisson à induction (1) selon la revendication 2, caractérisée en ce que le moyen (5) de lissage ou d'élimination est associé au redresseur de courant alternatif (20) et lisse le courant continu non lissé produit par le redresseur de courant alternatif (20).
  4. Plaque de cuisson à induction (1) selon la revendication 2 ou 3, caractérisée en ce que le moyen (5) de lissage ou d'élimination est associé au générateur à circuit oscillant (8).
  5. Plaque de cuisson à induction (1) selon la revendication 1, caractérisée en ce que le dispositif générateur (4) comprend un générateur à circuit oscillant (8) qui fonctionne sur la tension de réseau.
  6. Plaque de cuisson à induction (1) selon la revendication 4 ou 5, caractérisée en ce que le générateur à circuit oscillant (8) comprend une régulation/commande de circuit oscillant (21), une modulation d'amplitude du courant alternatif à haute fréquence étant lissée ou éliminée par une régulation de puissance dans le circuit oscillant.
  7. Procédé pour chauffer par induction une casserole (10) à l'aide d'une plaque de cuisson à induction (1) avec une bobine d'induction (3) alimentée par un courant alternatif à haute fréquence et avec un dispositif générateur (4) pour produire le courant alternatif à haute fréquence, comportant les étapes suivantes :
    - alimentation du dispositif générateur (4) par un courant pour produire un courant alternatif à haute fréquence,
    - alimentation de la bobine d'induction (3) par un courant alternatif à haute fréquence et production d'un champ magnétique alternatif qui produit des courants de Foucault dans la casserole (10),
    caractérisé en ce que
    - pour réduire le ronflement de la casserole, le courant alternatif est produit à haute fréquence de telle sorte qu'il ne présente pas de modulation d'amplitude
    - ou on lisse la modulation d'amplitude du courant alternatif à haute fréquence, et
    - le facteur de lissage est de 70 à 100 %.
  8. Procédé selon la revendication 7, caractérisé en ce que la casserole (10) est mise en oscillation par le champ magnétique alternatif de telle sorte qu'il ne se produit pas d'émission de bruit ou qu'une émission de bruit réduite.
  9. Procédé selon au moins l'une des revendications 7 à 8, caractérisé en ce qu'un courant continu lissé est envoyé à un générateur à circuit oscillant (8) du dispositif générateur (4).
  10. Procédé selon la revendication 7, caractérisé en ce que la régulation de puissance du circuit oscillant d'un générateur à circuit oscillant (8) s'effectue de telle sorte qu'aucune oscillation à basse fréquence n'est introduite dans le circuit oscillant.
  11. Procédé selon la revendication 10, caractérisé en ce que la régulation de puissance s'effectue de telle sorte que les variations d'amplitude dues à un courant continu non lissé qui est envoyé au circuit oscillant sont compensées.
EP07703206.8A 2007-02-01 2007-02-01 Plaque de cuisson à induction Not-in-force EP2127478B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/000877 WO2008092476A1 (fr) 2007-02-01 2007-02-01 Plaque de cuisson à induction

Publications (3)

Publication Number Publication Date
EP2127478A1 EP2127478A1 (fr) 2009-12-02
EP2127478B1 EP2127478B1 (fr) 2010-09-29
EP2127478B2 true EP2127478B2 (fr) 2013-12-25

Family

ID=38472910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07703206.8A Not-in-force EP2127478B2 (fr) 2007-02-01 2007-02-01 Plaque de cuisson à induction

Country Status (6)

Country Link
US (1) US20100170893A1 (fr)
EP (1) EP2127478B2 (fr)
JP (1) JP2010518550A (fr)
AT (1) ATE483347T1 (fr)
DE (1) DE502007005236D1 (fr)
WO (1) WO2008092476A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017220823A1 (de) * 2017-11-22 2019-05-23 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Beheizen eines Kochgefäßes auf einem Induktionskochfeld und dafür ausgebildetes Induktionskochfeld
KR102040221B1 (ko) 2017-12-20 2019-11-04 엘지전자 주식회사 간섭 소음 제거 및 출력 제어 기능이 개선된 유도 가열 장치
KR102040219B1 (ko) 2018-01-03 2019-11-04 엘지전자 주식회사 간섭 소음 제거 및 출력 제어 기능이 개선된 유도 가열 장치
KR20200129002A (ko) 2019-05-07 2020-11-17 엘지전자 주식회사 간섭 소음 제거 기능 및 출력 제어 기능이 개선된 유도 가열 장치

Citations (2)

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Publication number Priority date Publication date Assignee Title
JPH0536472A (ja) † 1991-07-29 1993-02-12 Sharp Corp 電磁誘導加熱調理器
JP2003257610A (ja) † 2002-09-18 2003-09-12 Matsushita Electric Ind Co Ltd 誘導加熱装置

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Publication number Priority date Publication date Assignee Title
JPS5820226B2 (ja) * 1976-01-14 1983-04-22 松下電器産業株式会社 静止電力変換装置
US4112287A (en) * 1976-11-04 1978-09-05 White-Westinghouse Corporation Central oscillator for induction range using triac burner controls
US4438311A (en) * 1979-07-05 1984-03-20 Sanyo Electric Co., Ltd. Induction heating cooking apparatus
US4473732A (en) * 1981-01-07 1984-09-25 General Electric Company Power circuit for induction cooking
FR2608348B1 (fr) * 1986-12-10 1993-11-12 Electricite De France Appareil electrique de cuisson par induction a emission d'harmoniques reduite
DE3712242A1 (de) * 1987-04-10 1988-10-27 Thomson Brandt Gmbh Schaltung zur stromversorgung einer induktiven kochstelle
JP2685212B2 (ja) * 1988-03-29 1997-12-03 株式会社東芝 電磁調理器
JPH02119086A (ja) * 1988-10-27 1990-05-07 Matsushita Electric Ind Co Ltd 誘導加熱調理器
JP2002237377A (ja) * 2001-02-09 2002-08-23 Ricoh Co Ltd 誘導加熱方法，装置，定着装置および画像形成装置
ATE316320T1 (de) * 2001-11-21 2006-02-15 Matsushita Electric Ind Co Ltd Induktionserwärmungseinrichtung
JP4407639B2 (ja) * 2006-01-10 2010-02-03 パナソニック株式会社 誘導加熱調理器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0536472A (ja) † 1991-07-29 1993-02-12 Sharp Corp 電磁誘導加熱調理器
JP2003257610A (ja) † 2002-09-18 2003-09-12 Matsushita Electric Ind Co Ltd 誘導加熱装置

Also Published As

Publication number Publication date
US20100170893A1 (en) 2010-07-08
ATE483347T1 (de) 2010-10-15
WO2008092476A1 (fr) 2008-08-07
JP2010518550A (ja) 2010-05-27
DE502007005236D1 (de) 2010-11-11
EP2127478B1 (fr) 2010-09-29
EP2127478A1 (fr) 2009-12-02

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