WO2017149055A1 - Circuit de commande de puissance de cuisinière à induction - Google Patents

Circuit de commande de puissance de cuisinière à induction Download PDF

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Publication number
WO2017149055A1
WO2017149055A1 PCT/EP2017/054845 EP2017054845W WO2017149055A1 WO 2017149055 A1 WO2017149055 A1 WO 2017149055A1 EP 2017054845 W EP2017054845 W EP 2017054845W WO 2017149055 A1 WO2017149055 A1 WO 2017149055A1
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WO
WIPO (PCT)
Prior art keywords
vessel
control circuit
power control
power
microcontroller
Prior art date
Application number
PCT/EP2017/054845
Other languages
English (en)
Inventor
Metin OZTURK
Atakan SARIOGLU
Ulas OKTAY
Sercan SINIRLIOGLU
Original Assignee
Arcelik Anonim Sirketi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2017149055A1 publication Critical patent/WO2017149055A1/fr

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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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the present invention relates to an induction heating cooker that detects the ferromagnetic properties of the vessel placed thereon.
  • the induction heating cooker functions according to the principle of heating a cast iron or steel ferromagnetic cooking vessel with the magnetic field generated by the induction coil.
  • a high-level electric current is passed through the power switch (such as IGBT (Insulated Gate Bipolar Transistor), diode, MOSFET, etc.) on the electronic circuit.
  • the power switch such as IGBT (Insulated Gate Bipolar Transistor), diode, MOSFET, etc.
  • HBSR half bridge series resonant
  • vessels suitable to be used on the induction heating cookers have different characteristics depending on the alloy they comprise. In other words, the ferromagnetic characteristics of the vessels are different. While aluminum alloy pots have low inductance values, cast iron vessels have high inductance values. Therefore, it is important to know the ferromagnetic characteristics of a vessel placed onto the induction heating cooker. When a vessel that has a low ferromagnetic quality, meaning that has a low capacity of converting magnetic energy into thermal energy is placed onto the induction heating cooker, the vessel cannot be heated in accordance with the selected power setting, causing increase in power consumption and damaging the electronic circuit.
  • the European Patent No. EP2034801 relates to an induction heating appliance that enables the user to be informed of the cooking capabilities of cookware suitable for induction heating.
  • the European Patent No. EP2282606 relates to an induction heating appliance control method. By comparing the resonant voltage with a constant reference voltage predetermined by the control unit, the presence or absence of a vessel present on the induction coil, and the resistivity and the amplitude thereof is determined.
  • an induction cooking system comprising a power inverter, a microprocessor, a protection circuit and a pan detection circuit is disclosed.
  • the aim of the present invention is the realization of a power control circuit that detects the ferromagnetic characteristics of the vessel placed onto the induction coil.
  • the induction heating cooker power control circuit realized in order to attain the aim of the present invention, explicated in the first claim and the respective thereof, comprises a microcontroller that calculates the vessel resistance and inductance according to the power drawn from the mains and to the current passing through the induction coil while the induction coil is energized at any power setting selected via the user interface and that decides whether or not the vessel is present by checking if the vessel inductance is between the predetermined lower and upper limit values, and the microcontroller deciding if the ferromagnetic characteristics of the vessel are suitable for induction cooking in the case that the vessel is present.
  • the microcontroller decides that the ferromagnetic characteristics of the vessel is not suitable if the inductance of the vessel is below the lower limit value.
  • the microcontroller decides that the vessel is not present on the induction heating cooker if the vessel inductance is above the upper limit value.
  • the microcontroller determines the resonant frequency that provides the maximum power to be transmitted to the vessel.
  • the power control circuit of the present invention furthermore comprises a mains current monitoring circuit, an input voltage monitoring circuit, a coil current monitoring circuit that monitors the current of the induction coil and a capacitance voltage monitoring circuit that together provide the data required for the microcontroller to calculate the said vessel inductance.
  • the induction heating cooker power control circuit of the present invention quickly and correctly detects if the vessel is present on the cooker when the induction coil is energized and if the vessel is present, detects if the ferromagnetic characteristics thereof are suitable.
  • the power control circuit determines the resonant frequency suitable for the vessel type, thus decreasing the power consumption and preventing the electronic circuit components from being damaged.
  • Figure 1 – is the schematic view of the induction heating cooker power control circuit
  • the power control circuit (1) (also referred to as the inverter circuit) that is suitable to be used in induction heating cookers and that provides the generation of magnetic energy for heating a vessel (16) placed onto the induction heating cooker surface, comprises an AC filter circuit (2) that filters the mains current; a bridge rectifier (3) that converts the alternative current received from the mains into direct current; a DC filter inductor (4) and a DC filter capacitor (5) that are disposed at the outlet of the bridge rectifier (3) on the DC line; an induction coil (6) that is energized for heating the vessel (16) placed onto the induction heating cooker; at least one resonant capacitor (7) that energizes the induction coil (6); at least one power switch (8), for example an IGBT (Insulated Gate Bipolar Transistor) that enables the resonant capacitor (7) to be charged/discharged and that provides the transmission of power from the induction coil (6) to the vessel (16); a drive voltage (9) that enables the power switch (8) to be driven with a drive voltage
  • the induction heating cooker is operated by means of an on-off button (not shown in the figures) and first electronic components such as the microcontroller (11) and the user interface (not shown in the figures) are activated. Afterwards, in order to heat the vessel at the desired power setting, the heating setting is selected via the user interface and the induction coil (6) is energized by the power control circuit (1).
  • the power control circuit (1) of the present invention comprises the microcontroller (11) that calculates the vessel resistance (R) depending on the power drawn from the mains and on the current passing through the induction coil (6) and calculates the vessel inductance (L) depending on the vessel resistance (R) while the induction coil (6) is energized during the power transmission from the induction heating cooker to the vessel (16) at any power setting selected via the user interface and that decides that the ferromagnetic characteristics of the vessel (16) are suitable for induction cooking and that continues induction heating if the vessel inductance (L) is between the predetermined vessel inductance lower limit (L-lower) and upper limit (L-upper) prerecorded in its memory (L-lower ⁇ L ⁇ L-upper).
  • the microcontroller (11) decides that the ferromagnetic characteristics of the vessel (16) are not suitable if the calculated vessel inductance (L) is below the vessel inductance lower limit (L-lower) and ends the heating process, enabling the user to be warned audibly and/or visually by means of the user interface.
  • the microcontroller (11) decides that the vessel (16) is not present on the induction heating cooker if the calculated vessel inductance (L) is above the vessel inductance upper limit (L-upper) and ends the heating process, enabling the user to be warned audibly and/or visually by means of the user interface.
  • the microcontroller (11) determines the resonant frequency, in other words the minimum operation frequency, that provides the maximum power to be transmitted to the vessel (16).
  • the resonant frequency determined by the microcontroller (11) by using the vessel inductance (L) is applied. Different resonant frequencies are determined for vessels (16) with different magnetic properties placed on the induction heating cooker. Thus, the vessels (16) of different types are enabled to be heated in accordance with the vessel inductance (L), decreasing the energy consumption.
  • the power control circuit (1) comprises a mains current monitoring circuit (12) connected to the DC line and an input voltage monitoring circuit (13) connected to the outlet of the bridge rectifier (3) that together provide the calculation of the power drawn from the mains in order to determine the vessel resistance (R).
  • the microcontroller (11) calculates the power drawn from the mains by calculating and using the root means square of the current values drawn from the mains according to the data received from the mains current monitoring circuit (12) and the root mean square of the input voltage values according to the data received from the input voltage monitoring circuit (13).
  • the power control circuit (1) furthermore comprises a coil current monitoring circuit (14) that provides the calculation of the vessel resistance (R) by the microcontroller (11), that is connected to the induction coil (6) and that monitors the current passing through the induction coil (6).
  • the microcontroller (11) calculates the maximum current value passing through the induction coil (6) according to the data received from the coil current monitoring circuit (14) and also calculates the vessel resistance (R) by using the ratio of the power drawn from the mains to the said maximum current value.
  • the power control circuit (1) comprises a capacitance voltage monitoring circuit (15) that provides the calculation of the vessel inductance (L) by the microcontroller (11) and that is connected to the collector node (10).
  • the microcontroller (11) determines the maximum capacitance voltage according to the data received from the capacitance voltage monitoring circuit (15) and calculates the vessel inductance (L) by using the previously calculated vessel resistance (R).
  • the power control circuit (1) is a half bridge series resonant (HBSR) circuit comprising a pair of resonant capacitors (7) and a pair of power switches (8).
  • HBSR half bridge series resonant
  • the power control circuit (1) is a single switch quasi resonant (SSQR) circuit comprising a single resonant capacitor (7) and a single power switch (8). In some embodiments, it is known as single-ended inverter circuit.
  • SSQR single switch quasi resonant
  • the microcontroller (11) decides whether or not the ferromagnetic characteristics of the vessel (16) are suitable by calculating the vessel inductance (L) when the induction coil (6) is energized. If the vessel inductance (L) is between the predetermined lower and upper limit values (L-lower and L-upper), the heating process is continued, providing an efficient transmission of power in accordance with the characteristics of the vessel (16). If the vessel (16) is not suitable, the energy transmission is terminated, thus preventing the electronic circuit components from being damaged with high current.

Abstract

La présente invention concerne un circuit de commande de puissance (1) approprié pour être utilisé dans des cuisinières à induction, comprenant un circuit filtrant côté courant alternatif (2) qui filtre le courant de secteur; un redresseur en pont (3) qui convertit le courant alternatif reçu du secteur en courant continu; une bobine d'induction de filtrage côté courant continu (4) et un condensateur de filtrage côté courant continu (5) qui sont disposés à la sortie du redresseur en pont (3) sur la ligne CC; une bobine d'induction (6) qui est excitée pour chauffer le récipient (16) placé sur la cuisinière à induction; au moins un condensateur de résonance (7) qui alimente la bobine d'induction (6); au moins un interrupteur (8), par exemple un transistor bipolaire à grille isolée qui permet au condensateur de résonance (7) d(être chargé/déchargé et qui assure la transmission d'énergie de la bobine d'induction (6) au récipient (16); une tension d'attaque (9) qui permet à l'interrupteur (8) d'être commandé avec une tension d'attaque au niveau souhaité; un nœud collecteur (10) sur lequel est générée la tension résonante, et un microcontrôleur (11) qui régule le fonctionnement de l'interrupteur (8) au moyen du circuit d'attaque (9), le circuit de commande de puissance (1) déterminant si les propriétés ferromagnétiques du récipient (16) placé sur la bobine d'induction (6) sont appropriées pour un chauffage par induction.
PCT/EP2017/054845 2016-03-04 2017-03-02 Circuit de commande de puissance de cuisinière à induction WO2017149055A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201602875 2016-03-04
TRA2016/02875 2016-03-04

Publications (1)

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WO2017149055A1 true WO2017149055A1 (fr) 2017-09-08

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1629698A1 (fr) 2003-05-28 2006-03-01 Tubitak-Bilten ( Turkiye Bilimsel Ve Teknik Arastirma Kurumu-Bilgi Teknolojileri Ve Elektronik Arastirma Enstitusu) Plan de cuisson par induction
EP2034801A1 (fr) 2007-09-05 2009-03-11 Whirlpool Corporation Appareil de cuisson par induction amélioré et procédé pour vérifier les capacités de cuisson d'un appareil de cuisson
EP2282606A1 (fr) 2009-08-05 2011-02-09 Coprecitec, S.L. Procédé de commande pour un appareil à induction et appareil à induction
EP2437573A1 (fr) * 2009-05-26 2012-04-04 Mitsubishi Electric Corporation Dispositif de cuisson par induction et procédé de chauffage par induction
US20150060439A1 (en) * 2012-05-10 2015-03-05 Behr-Hella Thermocontrol Gmbh Device for inductively heating a heating element

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1629698A1 (fr) 2003-05-28 2006-03-01 Tubitak-Bilten ( Turkiye Bilimsel Ve Teknik Arastirma Kurumu-Bilgi Teknolojileri Ve Elektronik Arastirma Enstitusu) Plan de cuisson par induction
EP2034801A1 (fr) 2007-09-05 2009-03-11 Whirlpool Corporation Appareil de cuisson par induction amélioré et procédé pour vérifier les capacités de cuisson d'un appareil de cuisson
EP2437573A1 (fr) * 2009-05-26 2012-04-04 Mitsubishi Electric Corporation Dispositif de cuisson par induction et procédé de chauffage par induction
EP2282606A1 (fr) 2009-08-05 2011-02-09 Coprecitec, S.L. Procédé de commande pour un appareil à induction et appareil à induction
US20150060439A1 (en) * 2012-05-10 2015-03-05 Behr-Hella Thermocontrol Gmbh Device for inductively heating a heating element

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