EP2341758B1 - Verfahren und Vorrichtung zur Bestimmung der sofort gelieferten Leistung von Induktionsmitteln, die mit einem Heizbehälter verbunden sind - Google Patents

Verfahren und Vorrichtung zur Bestimmung der sofort gelieferten Leistung von Induktionsmitteln, die mit einem Heizbehälter verbunden sind Download PDF

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Publication number
EP2341758B1
EP2341758B1 EP20100196434 EP10196434A EP2341758B1 EP 2341758 B1 EP2341758 B1 EP 2341758B1 EP 20100196434 EP20100196434 EP 20100196434 EP 10196434 A EP10196434 A EP 10196434A EP 2341758 B1 EP2341758 B1 EP 2341758B1
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Prior art keywords
switch
igbt
current
instantaneous power
determining
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English (en)
French (fr)
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EP2341758A1 (de
Inventor
Cédric GOUMY
Etienne Alirol
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FagorBrandt SAS
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FagorBrandt SAS
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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 present invention relates to a method for determining the instantaneous power delivered by induction means associated with a container to be heated.
  • induction hobs comprising one or more induction heaters suitable for heating a container placed on a fireplace.
  • each zone or cooking zone is controlled by a single power element integrated in an inverter supply device.
  • inverter supply device is described in particular in the document WO 2007/042315 in which the induction means integrated in a resonant circuit are fed from an inverter supply device comprising a switch, of the type of a voltage-controlled transistor, known under the name IGBT (acronym of the English term " Insulated Gate Bipolar Transistor" , connected in series with the resonant circuit.
  • IGBT Insulated Gate Bipolar Transistor
  • This switch is itself connected in parallel with a freewheeling diode.
  • Such an inverter supply device operates according to a switching frequency of the switch, corresponding to a control period T.
  • This switch is also associated with a duty cycle ⁇ , ⁇ less than 1, defined so that the switch is switched to the ON position for a duration ⁇ T of the control period T.
  • This duration ⁇ T thus corresponds to the period of conduction of the switch and the freewheeling diode for each control period T.
  • This regulation of the power supplied by the induction means to a container to be heated requires knowing the power delivered by the induction means.
  • the document WO 2007/042315 proposes an induction heating device in which the power delivered by the induction means is calculated from a mean in time of the current measured at the switch and the freewheeling diode, by multiplying the value average of this current with an actual value of the ac voltage of the mains supply.
  • the present invention aims to provide a method for determining an instantaneous power delivered by induction means associated with a container to be heated, to permanently know the instantaneous power delivered by the induction means.
  • the present invention relates to a method for determining the instantaneous power delivered by induction means associated with a container to be heated, the induction means being integrated into a resonant circuit powered from a mains supply. having a predetermined mains voltage, by an inverter supply device comprising a switch connected in series with the resonant circuit and a freewheeling diode connected in parallel with the switch, the switch having a given conduction duty cycle and being controlled at a switching frequency corresponding to a control period.
  • the Applicant has been able to demonstrate that in the case of the supply of induction means by a single power element integrated in the inverter supply device, it was possible to obtain the instantaneous power delivered by the induction means. by knowing two values of the current at precise moments.
  • This instantaneous power value can then be optimally used in a control loop in order to determine the average power delivered by these induction means to a container to be heated and to slave this average power to a reference power associated with these induction means for heating the container.
  • the first peak current is equal to the current flowing in the switch at the end of a conduction period of the switch
  • the second peak current is equal to the current flowing in the freewheeling diode at the beginning of a conduction period of the freewheeling diode.
  • the determination of the instantaneous power can be achieved by measuring the value of the current at the ON position of the switch and the value of the current at the OFF position of this switch.
  • This measurement can thus be implemented by the simple addition of peak value detectors in a current measurement system circulating in the switch and the freewheeling diode.
  • the present invention also relates to a device for determining the instantaneous power delivered by induction means associated with a container to be heated, the induction means being integrated into a resonant circuit powered, from a mains supply having a predefined mains voltage, by an inverter supply device comprising a switch connected in series with the resonant circuit and a freewheeling diode connected in parallel with the switch, the switch having a given conduction duty cycle and being controlled at a switching frequency corresponding to a control period.
  • This device has characteristics and advantages similar to those described above in relation to the method for determining the instantaneous power.
  • the present invention also relates to an induction cooking appliance, comprising at least one cooking chamber associated with induction means, comprising an instantaneous power determining device according to the invention.
  • This induction cooking appliance also has characteristics and advantages similar to those described above.
  • this cooking appliance may be an induction hob 10 comprising at least one cooking zone associated with induction means.
  • the hob has four cooking burners F1, F2, F3, F4, each cooking zone being associated with induction means comprising one or more induction coils.
  • This hob 10 conventionally comprises a power phase of a power supply 11, typically a mains power supply.
  • the hob 10 is supplied with 32 A, which can provide a maximum power of 7200 W at the hob 10, a power of 3600 W per phase.
  • the induction means associated with each cooking hearth F1, F2, F3, F4 can in practice be made from one or more coils in which the electric current flows, mounted on a power phase.
  • a control and power control card 12 makes it possible to support all the electronic and computer means necessary for controlling the hob 10, and in particular for determining the instantaneous power according to the method that will be described below.
  • the set of induction means and the control and control board 12 are placed under a flat cooking surface, for example made from a glass-ceramic plate.
  • the cooking hobs can also be identified by screen printing vis-à-vis the induction coils placed under the cooking surface.
  • hob in which four cooking zones constituting foci F1, F2, F3, F4 are predefined in the hob
  • the present invention also applies to a hob having a variable number or different forms of cooking hearth, or, having a hob without predefined zones or cooking zones, the latter being defined case by case by the position of the container vis-à-vis a subset of induction coils disposed under the cooking plane.
  • the hob 10 also comprises control and interface means 14 with the user, in particular enabling the user to control in power and in duration the operation of each focus F1, F2, F3, F4.
  • the user can through the control and interface means 14 assign a set power to each cooking hearth covered with a container.
  • an inductance L represents both the inductance of the induction means and that of the container to be heated placed vis-à-vis.
  • the system constituted by the container and the induction means of the hearth can thus be schematized by an inductance L mounted in series with a resistor R, mainly characterizing the resistance of the container.
  • the resonant circuit also comprises a capacitor C connected in parallel with the inductor L and the resistor R.
  • the resonant circuit thus constituted is powered by an inverter supply device comprising here a single switch or power element.
  • This switch is for example a switch of the type of a voltage-controlled transistor, called in the following description IGBT switch (acronym for " Insulated Gate Bipolar Transistors ").
  • This IGBT switch is connected in series with the resonant circuit L, R, C, and a freewheeling diode D is connected in parallel with the IGBT switch.
  • inverter supply device comprising the IGBT switch and the freewheeling diode D, and controlled according to a switching frequency (or control period) is commonly used in the field of cooking appliances. induction and does not need to be described in more detail here.
  • the freewheeling diode is on and a negative current flows in the inductance L, the resistor R and the freewheeling diode D.
  • the IGBT switch turns on and a positive current flows in the inductance L, the resistor R and the IGBT switch.
  • the freewheeling diode D and the IGBT switch are blocked so that the current flows. in the inductance L, the resistor R and the resonance capacitor C.
  • the IGBT switch and the freewheeling diode D conduct the current for a conduction period ⁇ T, which is a function of the duty cycle ⁇ , characteristic of the IGBT switch, and of the control period T. .
  • the induction cooking appliance comprises, in addition to the resonant circuit L, C, R and the inverter supply device, an instantaneous power determining device 40.
  • This device for determining the instantaneous power 40 is integrated in the control and power control card 12 described in FIG. figure 1 .
  • This device for determining the instantaneous power 40 comprises means 41 for measuring peak currents flowing in the freewheeling diode D and the IGBT switch.
  • the determination device 40 also comprises determination means 42 adapted to determine the instantaneous power delivered by the induction means to the container to be heated, from the value of the peak currents, of the control period T corresponding to the frequency of the switching of the IGBT switch, as well as its duty cycle ⁇ , determining the fraction of the control period T during which the IGBT switch and the freewheeling diode D are conductive.
  • the determination means 42 are conventionally made by software means of the microprocessor type.
  • the induction cooking appliance also comprises control means 43 adapted to control the operation of the IGBT switch from the control period T, corresponding to the switching frequency, and the duty cycle ⁇ .
  • control means 43 are also integrated in the control and power control board 12.
  • the determination means 42 are adapted to communicate with the control means 43 in order to obtain the value of the control period T and the duty cycle ⁇ .
  • I the effective current flowing in the inductor.
  • the Applicant has found that it is possible to calculate the value of the resistance R for a given heating vessel, so that it is possible to determine then the instantaneous power delivered by the system according to the preceding formula.
  • This calculation uses peak values taken by the current flowing in the freewheeling diode D and the IGBT switch.
  • the first peak current It corresponds to the value of the current flowing in the IGBT switch at the end of the conduction period ⁇ T of the IGBT switch, that is to say to the OFF setting of the IGBT switch.
  • the second peak current Id is equal to the current flowing in the freewheeling diode D at the beginning of the conduction period ⁇ T of this freewheeling diode D, that is to say to the ON setting of the IGBT switch.
  • the voltage U seen by the system corresponding to the mains voltage supplied by the mains supply, is constant at each instant t and is written for a system consisting of an inductor L and a resistor R:
  • the IGBT switch and the freewheeling diode D are off and the current i flows freely in the inductance L, resistance R and capacitor C.
  • the control period T is defined, as well as the duty cycle ⁇ of the IGBT switch, and that values of the first peak current It and the second peak current Id are measured.
  • the step of determining the instantaneous power can thus be carried out at any time by the resolution of the system with two equations and two unknowns above and the formula connecting the instantaneous power to the effective current.
  • the determination method consists in finding in the four-dimensional array the value of the power associated with the coordinates of the quadruplet.
  • the measuring means 41 of the first and second peak current Ids comprise means for measuring a current i L flowing in the induction means L, the measuring means 41 being associated with means for integrated synchronization in the microprocessor 42.
  • These synchronization means are adapted to synchronize the measurement means 41 of the current with the control means of the IGBT switch.
  • the measurement of the current i L flowing in the inductor can be done by a current transformer 50.
  • the value of the voltage across a load resistor R1, placed at the output of the intensity transformer 50 corresponds to the image of the current flowing in inductance L.
  • the value of the current i L measured corresponds to the value of the second peak current Id flowing in the freewheeling diode.
  • the measured current value i L corresponds to the value of the first peak current It , flowing in the IGBT switch.
  • This embodiment has the advantage of only using a load resistor R1 at the secondary of the intensity transformer 50.
  • the measuring means comprise means for measuring the current i IGBT , i D flowing in the IGBT switch and the freewheeling diode D and means for detecting the peak value of this current i IGBT , i D .
  • two detection systems 61, 62 of peak values are added to the current measurement system, here at the output of the intensity transformer 60 and the load resistor R1.
  • the voltage in the load resistor R1 corresponds to the image of the current i IGBT , i D flowing in the IGBT switch and the freewheeling diode D.
  • Each detection system 61, 62 respectively comprises a diode D1 associated with a capacitor C1 and a diode D2 associated with a capacitor C2, and makes it possible to measure the image of the values of the peak currents It and Id.
  • Diode D1 is blocked while diode D2 is on and capacitor C2 is charged.
  • the value of the charge of the capacitor C2 thus corresponds to the image of the value of the peak current Id.
  • the diode D2 is blocked while the diode D1 is on and the capacitor C1 is loaded.
  • the value of the charge of the capacitor C1 thus corresponds to the image of the value of the peak current It.
  • each detection system 61, 62 of peak values is connected to the microprocessor 42.
  • the measurement of the current at two precise times makes it possible to determine the parameters L, R of the system and the instantaneous power delivered by this system to the container to be heated.
  • control means of the inverter supply device are adapted to control the operation of the inverter supply device from the value of the instantaneous power delivered by the induction means.
  • a cooking stove associated with the container to be heated, and a set power associated with the cooking stove.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Inverter Devices (AREA)

Claims (11)

  1. Verfahren zur Bestimmung der Momentanleistung, die von Induktionsmitteln abgeben wird, die einem zu erwärmenden Behälter zugeordnet sind, wobei die Induktionsmittel in eine Resonanzschaltung (L, C, R) integriert sind, die ausgehend von einer Netzstromversorgung mit einer vorbestimmten Netzspannung von einer Wechselrichterversorgungsvorrichtung gespeist wird, welche einen mit der Resonanzschaltung (L, C, R) in Reihe geschalteten Schalter (IGBT) und eine mit dem Schalter (IGBT) parallel geschaltete Freilaufdiode (D) aufweist, wobei der Schalter (IGBT) ein vorgegebenes zyklisches Stromflussverhältnis (Δ) hat und mit einer Schaltfrequenz gesteuert wird, die einer Steuerungsperiode (T) entspricht, dadurch gekennzeichnet, dass es folgende Schritte umfasst:
    - Messen eines ersten Spitzenstroms (It), der im Schalter (IGBT) fließt;
    - Messen eines zweiten Spitzenstroms (Id), der in der Freilaufdiode (D) fließt; und
    - Bestimmen der Momentanleistung, die von den dem zu erwärmenden Behälter zugeordneten Induktionsmitteln abgegeben wird, mittels einer bijektiven Funktion, die die Momentanleistung einer Vierermenge aus Werten des ersten Spitzenstroms (It), des zweiten Spitzenstroms (Id), des zyklischen Verhältnisses (Δ) des Schalters (IGBT) und der Steuerungsperiode (T) zuordnet.
  2. Verfahren zur Bestimmung der Momentanleistung nach Anspruch 1, dadurch gekennzeichnet, dass der erste Spitzenstrom (It) dem Strom entspricht, der am Ende einer Stromflussperiode (ΔT) des Schalters (IGBT) im Schalter (IGBT) fließt.
  3. Verfahren zur Bestimmung der Momentanleistung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der zweite Spitzenstrom (Id) dem Strom entspricht, der am Anfang einer Stromflussperiode (ΔT) der Freilaufdiode (D) in der Freilaufdiode (D) fließt.
  4. Verfahren zur Bestimmung der Momentanleistung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Schritte zur Messung eines ersten und eines zweiten Spitzenstroms folgende Unterschritte umfassen:
    - Messen eines im Schalter (IGBT) und in der Freilaufdiode (D) fließenden Stroms (iIGBT, iD); und
    - Erfassen des Spitzenwerts (It, Id) des ersten, im Schalter (IGBT) fließenden Stroms und des zweiten, in der Freilaufdiode (D) fließenden Stroms.
  5. Verfahren zur Bestimmung der Momentanleistung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Schritte zur Messung eines ersten und eines zweiten Spitzenstroms folgende Unterschritte umfassen:
    - Messen eines in den Induktionsmitteln fließenden Stroms (iL);
    - Bestimmen des Werts des Stroms (iL), der am Ende der Stromflussperiode (ΔT) des Schalters (IGBT) in den Induktionsmitteln fließt, um den Wert des ersten Spitzenstroms (It) zu bestimmen; und
    - Bestimmen des Werts des Stroms (iL), der am Anfang der Stromflussperiode (ΔT) der Freilaufdiode (D) in den Induktionsmitteln fließt, um den Wert des zweiten Spitzenstroms (Id) zu bestimmen.
  6. Verfahren zur Bestimmung der Momentanleistung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Schritt zur Bestimmung der Momentanleistung ausgeführt wird, indem ein Momentanleistungswert aus einer Tabelle mit vier Dimensionen ausgewählt wird, die jede Vierermenge aus Werten des ersten Spitzenstroms (It), des zweiten Spitzenstroms (Id), des zyklischen Verhältnisses (Δ) des Schalters (IGBT) und der Steuerungsperiode (T) einem einzelnen Momentanleistungswert zuordnet.
  7. Vorrichtung zur Bestimmung der Momentanleistung, die von Induktionsmitteln abgeben wird, die einem zu erwärmenden Behälter zugeordnet sind, wobei die Induktionsmittel in eine Resonanzschaltung (L, C, R) integriert sind, die ausgehend von einer Netzstromversorgung mit einer vorbestimmten Netzspannung von einer Wechselrichterversorgungsvorrichtung gespeist wird, welche einen mit der Resonanzschaltung (L, C, R) in Reihe geschalteten Schalter (IGBT) und eine mit dem Schalter (IGBT) parallel geschaltete Freilaufdiode (D) aufweist, wobei der Schalter (IGBT) ein vorgegebenes zyklisches Stromflussverhältnis (Δ) hat und mit einer Schaltfrequenz gesteuert wird, die einer Steuerungsperiode (T) entspricht, dadurch gekennzeichnet, dass sie Folgendes aufweist:
    - Mittel (41) zur Messung eines ersten Spitzenstroms (It), der im Schalter (IGBT) fließt;
    - Mittel (41) zur Messung eines zweiten Spitzenstroms (Id), der in der Freilaufdiode (D) fließt; und
    - Mittel (42) zur Bestimmung der Momentanleistung, die von den dem zu erwärmenden Behälter zugeordneten Induktionsmitteln abgegeben wird, mittels einer bijektiven Funktion, die die Momentanleistung einer Vierermenge aus Werten des ersten Spitzenstroms (It), des zweiten Spitzenstroms (Id), des zyklischen Verhältnisses (Δ) des Schalters (IGBT) und der Steuerungsperiode (T) zuordnet.
  8. Vorrichtung zur Bestimmung der Momentanleistung nach Anspruch 7, dadurch gekennzeichnet, dass die Mittel (41) zur Messung eines ersten und eines zweiten Spitzenstroms (It, Id) Mittel (60) zur Messung eines im Schalter (IGBT) und in der Freilaufdiode (D) fließenden Stroms (iIGBT, iD) und Mittel (61, 62) zur Erfassung eines Spitzenwerts des Stroms (iIGBT, iD) aufweisen.
  9. Vorrichtung zur Bestimmung der Momentanleistung nach Anspruch 7, dadurch gekennzeichnet, dass die Mittel (41) zur Messung eines ersten und eines zweiten Spitzenstroms (It, Id) Mittel (50) zur Messung eines in den Induktionsmitteln fließenden Stroms (iL) aufweisen, wobei die Messmittel (50) Mitteln zur Synchronisierung mit Mitteln (43) zur Steuerung des Schalters (IGBT) zugeordnet und dazu geeignet sind, den Wert des Stroms (iL) am Anfang und am Ende der Stromflussperiode (ΔT) des Schalters (IGBT) und der Freilaufdiode (D) zu speichern.
  10. Induktionskochgerät, mit mindestens einem Induktionsmitteln zugeordneten Kochfeld (F1, F2, F3, F4), dadurch gekennzeichnet, dass es eine Vorrichtung (40) zur Bestimmung der Momentanleistung nach einem der Ansprüche 7 bis 9 aufweist.
  11. Induktionskochgerät nach Anspruch 10, dadurch gekennzeichnet, dass es Mittel (43) zur Steuerung der Wechselrichterversorgungsvorrichtung aufweist, die dazu geeignet sind, den Betrieb der Wechselrichterversorgungsvorrichtung in Abhängigkeit von der Momentanleistung, welche von den Induktionsmitteln abgegeben wird, die einem zu erwärmenden Behälter zugeordnet sind, und von einer dem Kochfeld (F1, F2, F3, F4) zugeordneten Sollleistung zu kontrollieren.
EP20100196434 2009-12-31 2010-12-22 Verfahren und Vorrichtung zur Bestimmung der sofort gelieferten Leistung von Induktionsmitteln, die mit einem Heizbehälter verbunden sind Active EP2341758B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0959688A FR2954887B1 (fr) 2009-12-31 2009-12-31 Procede et dispositif de determination de la puissance instantanee delivree par des moyens d'induction associes a un recipient a chauffer

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EP2341758B1 true EP2341758B1 (de) 2012-09-05

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2701612B1 (fr) * 1993-02-16 1995-03-31 Thomson Electromenager Sa Procédé de commande de la puissance appliquée à un onduleur à résonance.
FR2783370B1 (fr) * 1998-09-11 2000-12-08 Cepem Dispositif d'alimentation a onduleur dont la puissance delivree est controlee
JP4432498B2 (ja) * 2004-01-14 2010-03-17 富士電機システムズ株式会社 誘導加熱インバータの制御装置
DE102005050037A1 (de) * 2005-10-14 2007-05-24 E.G.O. Elektro-Gerätebau GmbH Induktionsheizeinrichtung sowie Verfahren zum Betrieb einer solchen

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FR2954887B1 (fr) 2012-01-20
FR2954887A1 (fr) 2011-07-01
ES2391543T3 (es) 2012-11-27

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