EP2747514B1 - Procédé et dispositif d'alimentation en puissance des moyens d'induction - Google Patents

Procédé et dispositif d'alimentation en puissance des moyens d'induction Download PDF

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Publication number
EP2747514B1
EP2747514B1 EP13198656.4A EP13198656A EP2747514B1 EP 2747514 B1 EP2747514 B1 EP 2747514B1 EP 13198656 A EP13198656 A EP 13198656A EP 2747514 B1 EP2747514 B1 EP 2747514B1
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EP
European Patent Office
Prior art keywords
power
frequency
induction
supply device
switching means
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EP13198656.4A
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German (de)
English (en)
French (fr)
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EP2747514A1 (fr
Inventor
Etienne Alirol
Cédric GOUMY
Didier Gouardo
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Groupe Brandt SAS
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Groupe Brandt 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 power supply method of the induction means.
  • It also relates to a power supply device adapted to implement the power supply method, and an induction cooking appliance adapted to integrate such a device.
  • the present invention relates more particularly to the power supply of the induction means of an induction cooking appliance.
  • each zone or cooking zone is associated with induction means.
  • the operation of each cooking zone is controlled by a power element integrated in an inverter supply device.
  • inverter power supply device is also described in the document WO 2007/042315 in which 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
  • Such an inverter supply device operates at a switching frequency of the switch. By changing the switching frequency or working frequency of the inverter supply device, it is possible to adjust the instantaneous power delivered by the induction means to a cooking vessel disposed on a cooking zone.
  • the supply device powers the induction means from the rectified mains voltage by means of a rectifying circuit.
  • the induction means form part with the receptacle disposed on the cooking zone of a resonant circuit and that when the resonant frequency of this resonant circuit is equal to the frequency of working of the supply device, the current flowing through the resonant circuit is maximum.
  • the switching frequency of the switch or operating frequency of the inverter supply device is within an optimum operating range which is related to the operation of the switch.
  • the optimum operating range is thus defined between a minimum frequency corresponding to a maximum instantaneous power and a maximum frequency corresponding to a minimum instantaneous power.
  • the optimum frequency range is predetermined according to the parameters of the assembly formed by the induction means and the supply device.
  • the supply device When a user of the cooking appliance requests an instantaneous power, or nominal power, which is between the minimum instantaneous power and the maximum instantaneous power, the supply device operates in a continuous mode over a predetermined period called a program period. .
  • the program period corresponds to a period during which the power demanded by the user or the target power is restored.
  • This program period is predetermined in a manner known to those skilled in the art, in particular to comply with the EN-61000-3-3 standard on the electrical network (Flicker standard) setting a maximum number of authorized power variations in a minute.
  • a program period includes several alternating power grid periods.
  • the inverter supply device When the induction means must deliver a nominal power lower than the minimum instantaneous power, the inverter supply device operates in cut mode, that is to say that the power supply is cut in time.
  • the inverter supply device operates at the maximum frequency of continuous operation (frequency corresponding substantially to the frequency maximum of the optimum frequency range) during an interval of the program period.
  • the inverter supply device operates at a working frequency corresponding to the minimum instantaneous power, and during the remaining time of the program period, the inverter supply device does not operate. .
  • the minimum instantaneous power has a value of 500 W and the instantaneous power to be delivered in the induction means is 100 W
  • this instantaneous power of 100 W is restored by controlling the operation of the device in a maximum operating frequency so that the induction means deliver the minimum instantaneous power for an interval of 200 ms every second (the program time being in this example of one second).
  • This noise has a variable intensity depending in particular on the size, the material and the contents of the container, the parameters of the inductor (for example the size) and the value of the reconstituted power, and can be inconvenient for a user. an apparatus comprising such an inverter supply device.
  • the object of the present invention is to propose a method for controlling the induction means, making it possible to reduce, or even eliminate, the noise generated in a receptacle disposed on a cooking zone.
  • the present invention relates to a power supply method of the induction means, the induction means being associated with a cooking zone and being supplied to power values respectively by a power supply device.
  • inverter having switching means operating at a working frequency, in continuous mode when the target power value is greater than or equal to a minimum instantaneous power, and in the cut-off mode when the target power value is less than said power instantaneous minimum, said minimum instantaneous power corresponding to a maximum continuous operating frequency.
  • the switching means are operated for a predefined duration at a starting frequency higher than the maximum continuous operating frequency, at the beginning of a program period.
  • the current flowing in the container is lower than the current delivered when the switching means operate at a working frequency lower than the maximum continuous operating frequency.
  • the operation of the inverter supply device does not generate noise or at least generates a noise of low intensity and is not a nuisance for a user of the cooking appliance.
  • the switching means are operated for a predefined period of time at a starting frequency higher than the maximum continuous operating frequency when operating in cut mode.
  • the inverter supply device is capable of applying a mains voltage to the induction means, the predefined duration representing the time elapsed between a first instant from which the switching means are put into operation at a time. starting frequency and a second time from which switching means are operated at the working frequency substantially equal to the maximum continuous operating frequency.
  • the mains voltage is substantially zero.
  • the mains voltage is substantially zero.
  • the switching means are operated at the start frequency when the mains voltage has its peak value.
  • the mains voltage has its peak value.
  • the mains voltage changes between its peak value and a substantially zero value for the predetermined duration defined by the first instant (from which the switching means are operated at the start frequency) and the second instant (at from which the switching means are operated at the working frequency).
  • the switching means are operated at a starting frequency higher than the maximum continuous operating frequency at the beginning of each program period of the supply device in which the instantaneous power delivered by the induction means is restored.
  • the present invention relates to a power supply device supplying power to setpoint power values for the induction means and comprising switching means operating at a working frequency in continuous mode when the value of setpoint power is greater than or equal to a minimum instantaneous power, and in cut mode when the target power value is lower than said minimum instantaneous power, said minimum instantaneous power corresponding to a maximum continuous operating frequency.
  • the power supply device comprises control means configured to implement a power supply method according to the invention.
  • the present invention relates to an induction cooking appliance comprising a power supply device supplying power to induction means and being in accordance with the invention and implementing a power supply method in accordance with the invention. to the invention.
  • the power supply device and the induction cooking appliance have features and advantages similar to those previously described in connection with the power supply method.
  • the present invention finds particular application in an induction hob.
  • this cooking appliance may be an induction hob 10 comprising at least one cooking zone associated with induction means.
  • the hob 10 has four cooking bursts 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 supply 11, typically an AC power supply or mains 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, for the case of a hob 10 comprising two power phases.
  • each cooking zone F1, F2, F3, F4 can in practice be made from one or several 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.
  • 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.
  • cooktop in which four cooking zones constituting cooking heaters F1, F2, F3, F4 are predefined in the hob, the present invention also applies to a cooktop having a variable number or different forms of cooking hearth, or having a cooking surface without predefined zones or cooking zones, the latter being defined on a case-by-case basis by the position of the container under with respect to a subset of induction coils arranged 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.
  • the induction means are powered by an inverter supply device comprising switching means operating at a working frequency.
  • the inverter supply device 20 is able to apply the voltage of the AC mains or mains voltage 30 to the induction means I1, I2, I3 respectively corresponding to the firing heaters F1, F2, F3.
  • the mains voltage or voltage of the electrical network has for example a value of 230 VRMS (peak value of 325V) for the French power grid.
  • mains voltage may have different values, depending on the power grid of the country in which we are located.
  • the power supply device comprises, in particular, rectifying means 21 capable of rectifying the mains voltage 30 and synchronization means 22 making it possible to generate a periodic digital signal whose at least one of the rising edge and the falling edge is synchronous with a zero volt crossing of the mains voltage 30.
  • a capacitor C bus is connected to the output of the rectifying means 21.
  • the capacitor C bus is charged by the rectified mains voltage.
  • the voltage V bus taken at the terminals of this capacitor C bus is substantially equal to the peak value of the rectified mains voltage as long as no power is delivered by an inductor, the capacitor C bus remaining charged at this peak value of the rectified mains voltage.
  • This value is for example 325V for an electrical network with a voltage value of 230V.
  • power bridges 23a, 23b, 23c are connected to inductors I1, I2, I3 respectively.
  • the power bridges 23a, 23b, 23c may be constructed in a half bridge or full bridge architecture.
  • the supply device 20 further comprises a processing unit 24 adapted to control, in particular, the operation of the supply device 20.
  • the processing unit is for example a microcontroller, a microprocessor or a programmable logic circuit.
  • the figure 3 represents a diagram of a supply device 20 with a half-bridge architecture.
  • a power bridge 23a feeds a cooking furnace (not shown in FIG. figure 3 ).
  • the power bridge 23a has switching means.
  • the switching means are two power components A, B connected in series and functioning as two switches.
  • the power components are IGBT transistors (acronym for the term “ Insulated Gate Bipolar Transistors ").
  • IGBT transistors A, B operate alternately, that is to say when one is passing, the other is blocked.
  • an inductance L represents both the inductance of the induction means and that of the container to be heated placed vis-à-vis.
  • Two switching capacitors Ca, Cb are connected in parallel between the inductor L and the IGBT transistors A, B.
  • the IGBT switches A, B are operated in operation at a working frequency to adjust the instantaneous power delivered by the induction means to a container disposed on a cooking zone at the desired power demanded by a user.
  • the Figure 4 shows the instantaneous power that can be delivered by the induction means to a container disposed on a cooking zone, depending on the switching frequency of the IGBT transistors.
  • the switching frequency of the IGBT transistor is within an optimum operating range defined by a minimum frequency F 1 and a maximum frequency F 2 .
  • the minimum frequency F 1 corresponds to the maximum instantaneous power and the maximum frequency F 2 corresponds to the minimum instantaneous power.
  • the definition of this frequency range is known to those skilled in the art.
  • the minimum frequency F 1 (corresponding to the maximum instantaneous power) corresponds to the resonance frequency of the resonant circuit LC.
  • the maximum frequency F 2 is in particular defined taking into account the operating constraints of the IGBT transistor, for example to maintain a satisfactory thermal behavior.
  • the optimum operating range is between 18 KHz and 50 KHz. Of course, this range can be between different values.
  • the feeder can operate in continuous mode or in chopping mode. These modes of operation will be described with reference to the figure 5 .
  • This figure 5 represents the continuous instantaneous power delivered by the induction means on a container located on a cooking zone, as a function of time.
  • the IGBT transistors A, B operate (each in turn) in continuous mode according to a working frequency.
  • This working frequency is such that in a program period T prog (illustrated on the figure 5 ) the output power is substantially equal to the desired power demanded by the user.
  • the IGBT transistors A, B When the desired power demanded by the user is less than the minimum power (corresponding to a maximum continuous operating frequency), the IGBT transistors A, B operate in cut mode. In the split mode, the IGBT transistors A, B operate at the maximum frequency during an interval T dec of the program period T prog .
  • This interval T dec is determined so that the requested reference power is restored over the program period T prog . This determination being known to those skilled in the art will not be described in detail here.
  • the figure 6 shows curves illustrating schematically the evolution over time of different signals during the implementation of the feeding method according to the invention.
  • the voltage V bus represents the voltage across the capacitor C bus .
  • This voltage corresponds to the mains voltage V mains when at least one power bridge 23a, 23b, 23c of the inverter supply device is operated.
  • the voltage V bus is continuous and equal to the peak value of the mains voltage V mains .
  • the frequency of the mains voltage in France is 50 Hz (its period being thus 20 ms). Of course, the frequency has different values depending on the country in which you are.
  • the signal V com represents the control of the IGBT switches A, B. It will be noted that the voltage V bus is also represented superimposed on the signal V com .
  • This program period T prog includes several sector periods, all of which are not represented here.
  • the program period T prog has a value belonging to a range of values between 1 and 15 seconds.
  • the power supply device operates in cut mode.
  • the desired power demanded by the user is less than the minimum instantaneous power.
  • the IGBT transistors A, B are operated at a start frequency F d greater than the maximum continuous operating frequency F 2 for a predefined duration T X.
  • this working frequency has a value of 100 KHz.
  • this start frequency F d could have other values.
  • each time the IGBT transistors A, B are put into operation that is to say at the beginning of a program period T prog , they are operated at a starting frequency F d greater than maximum continuous operating frequency F 2 .
  • the circulating current I ind in the inductor is not very high and the noise generated in the container is reduced or even zero.
  • the current I ind circulating in the inductor does not exceed 16.5 A for a frequency of 100 KHz, whereas for a frequency of 50 KHz (maximum continuous operating frequency F2), the current I ind reaches 26A.
  • the predefined duration T x represents the time elapsed between a first instant t1 from which the switching means are put into operation and a second instant t2 from which the switching means are put into operation at the working frequency F T equal to the maximum continuous operating frequency F 2 .
  • the second instant t2 corresponds to a time when the mains voltage is substantially zero.
  • the IGBT transistors A, B are operated when the mains voltage V bus has its maximum value or peak value.
  • the predefined duration Tx has a value of between 2 and 5 ms.
  • the transistors IGBT A, B operate at this start frequency F d until the end of the interval Tx.
  • the IGBT transistors A, B each in turn operate at a working frequency F T substantially equal to the maximum continuous operating frequency F 2 until the end of the interval T dec .
  • the IGBT transistors A, B do not work until the end of the program period T prog .
  • the operation of the switching means A, B according to a starting frequency F d greater than the maximum continuous operating frequency F 2 is implemented for a predetermined period Tx located at the beginning of each program period. T prog .
  • the operation of the switching means A, B according to a starting frequency F d greater than the maximum continuous operating frequency F 2 is implemented for a predetermined period Tx located at the beginning of a program period T prog over several program periods, for example located in one program period T prog out of two.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Inverter Devices (AREA)
  • Induction Heating Cooking Devices (AREA)
EP13198656.4A 2012-12-20 2013-12-19 Procédé et dispositif d'alimentation en puissance des moyens d'induction Active EP2747514B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1262422A FR3000361B1 (fr) 2012-12-20 2012-12-20 Procede et disposiif d'alimentation en puissance des moyens d'induction

Publications (2)

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EP2747514A1 EP2747514A1 (fr) 2014-06-25
EP2747514B1 true EP2747514B1 (fr) 2019-03-27

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EP (1) EP2747514B1 (es)
ES (1) ES2728849T3 (es)
FR (1) FR3000361B1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024056532A1 (de) * 2022-09-16 2024-03-21 BSH Hausgeräte GmbH Induktionskochfeldvorrichtung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2999304A1 (en) 2014-09-18 2016-03-23 Electrolux Appliances Aktiebolag Induction hob and method for operating an induction hob
CN113315499A (zh) * 2021-06-25 2021-08-27 阳光电源股份有限公司 一种功率器件的驱动方法、驱动电路及控制器

Family Cites Families (7)

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DE102005021888A1 (de) * 2005-05-04 2007-02-15 E.G.O. Elektro-Gerätebau GmbH Verfahren und Anordnung zur Leistungsversorgung mehrerer Induktionsspulen bei einem Induktionsgerät
DE102005050037A1 (de) 2005-10-14 2007-05-24 E.G.O. Elektro-Gerätebau GmbH Induktionsheizeinrichtung sowie Verfahren zum Betrieb einer solchen
EP2112862B1 (en) * 2008-04-25 2013-04-10 Electrolux Home Products Corporation N.V. Method and arrangement for dynamic wave form correction
TWI394547B (zh) * 2009-03-18 2013-05-01 Delta Electronics Inc 加熱裝置
FR2954886B1 (fr) * 2009-12-31 2012-01-20 Fagorbrandt Sas Procede et dispositif de determination d'une puissance minimale continue induite, notamment dans un appareil de cuisson a induction
FR2966688B1 (fr) * 2010-10-21 2015-11-20 Fagorbrandt Sas Procede de commande en fonctionnement d'une table de cuisson a induction et table de cuisson a induction utilisant ce procede.
ES2562616T3 (es) * 2011-03-31 2016-03-07 BSH Hausgeräte GmbH Placa de cocción por inducción

Non-Patent Citations (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024056532A1 (de) * 2022-09-16 2024-03-21 BSH Hausgeräte GmbH Induktionskochfeldvorrichtung

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Publication number Publication date
ES2728849T3 (es) 2019-10-29
FR3000361A1 (fr) 2014-06-27
FR3000361B1 (fr) 2014-12-26
EP2747514A1 (fr) 2014-06-25

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