EP2445308A1 - Verfahren zur Kontrolle von regelmäßigen Steuersignalen, insbesondere für ein Induktionskochfeld - Google Patents

Verfahren zur Kontrolle von regelmäßigen Steuersignalen, insbesondere für ein Induktionskochfeld Download PDF

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Publication number
EP2445308A1
EP2445308A1 EP11185828A EP11185828A EP2445308A1 EP 2445308 A1 EP2445308 A1 EP 2445308A1 EP 11185828 A EP11185828 A EP 11185828A EP 11185828 A EP11185828 A EP 11185828A EP 2445308 A1 EP2445308 A1 EP 2445308A1
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EP
European Patent Office
Prior art keywords
periodic
control signals
control
timing signal
signal
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Application number
EP11185828A
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English (en)
French (fr)
Inventor
Etienne Alirol
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FagorBrandt SAS
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FagorBrandt SAS
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Publication date
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Publication of EP2445308A1 publication Critical patent/EP2445308A1/de
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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
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils

Definitions

  • the present invention relates to a method for controlling periodic control signals implemented for the control in operation of inductors of an induction hob.
  • the present invention applies to the field of induction cooking, and more specifically to a hob comprising several heating elements formed by inductors.
  • induction hob comprising a large number of inductors distributed under a cooking plane in a two-dimensional grid.
  • Such a hob is particularly described in the document FR 2 863 039 and allows the heating of one or more containers placed on the hob without a predefined zone for the cooking hobs.
  • the inductors are fed respectively by control blocks, themselves controlled respectively by periodic control signals.
  • These periodic control signals are particularly adapted to control electronic power switches associated with each inductor. By varying the frequency of these periodic control signals and / or alternating the periods of activity and the rest periods of the electronic power switches, the power delivered by each inductor to a container can be set to a set value.
  • a control unit is used to control the periodic control signals addressed respectively to the control units of inductors of the hob, in particular to adjust the power delivered to the containers.
  • this control unit performs certain synchronized operations taking into account the periodic signal from the AC voltage signal of the electrical supply network of the hob.
  • the sinusoidal AC voltage signal of the supply network Ss and a periodic timing signal Sc are illustrated on the time axis.
  • this periodic timing signal Sc is a 0/1 "square" signal, each edge of which corresponds to a 0 volt change in the AC voltage signal Ss.
  • control unit of the periodic control signals is adapted to make modifications to these periodic control signals S1, S2.
  • the periodic control signals can in particular be stopped or started at a predetermined time of the periodic timing signal Sc.
  • control unit controls the periodic control signals S1, S2 independently, by looping on the various periodic control signals to be controlled.
  • the periodic control signals S1, S2 are started, stopped, modified or maintained without modification, without taking into account the operations performed on the other periodic control signals.
  • a first periodic control signal S1 is stopped at the beginning of a second period T2 and then started at the beginning of a third period T3 while a second periodic control signal S2 is kept permanently active on the different periods T1 , T2, T3 successive periodic timing signal Sc.
  • this type of control of the prior art has the disadvantage of introducing a variable phase difference between the periodic control, from one period to another of the periodic timing signal Sc.
  • This variable phase difference symbolized by the interval ⁇ separating the respective rising edges of two periodic control signals S1, S2, is visible for example in FIG. figure 1 between the first period T1 and the third period T3 of the periodic timing signal.
  • This variation of the relative phase shift d also corresponds to a modification of the phase between the periodic control signals S1, S2 over each period of the periodic timing signal Sc.
  • the power consumed by each inductor is different at each period of the periodic timing signal Sc.
  • This cooking device comprises a synchronization unit provided for synchronizing together at least two cooking hobs.
  • the object of the present invention is to propose a method for controlling periodic control signals making it possible to obtain a better stability in the power delivered by inductors of a hob.
  • the present invention relates, in a first aspect, to a method for controlling periodic control signals addressed respectively to control units of inductors of a hob.
  • this control method comprises a synchronization step periodically implemented at a predetermined time of a predefined periodic timing signal, the periodic control signals being stopped and / or started during the synchronization step, and the periodic control signals having a different frequency.
  • phase of the periodic control signals is controlled so that the phase difference between the periodic control signals is identical from one period to another of the predefined periodic timing signal.
  • the periodic control signals can thus be controlled independently and have a different frequency, the synchronization step for controlling the phase difference between the different periodic control signals.
  • This mastering of the phase of all the periodic control signals makes it possible to ensure a stability of the power consumed by each inductor whose operation is controlled from these periodic control signals.
  • the periodic control signals are reset during each synchronization step.
  • the periodic control signal when one of the periodic control signals is activated during a given period of the predefined periodic timing signal, the periodic control signal is stopped and restarted during the synchronization step implemented at said predetermined instant of a next period succeeding the given period of the predefined periodic timing signal.
  • the periodic control signals execute a complete cycle on each period of the predefined periodic timing signal.
  • the predefined periodic timing signal corresponds to the AC voltage signal of the electrical supply network of the hob.
  • the present invention also relates, according to a second aspect, to an induction hob comprising a plurality of inductors distributed under a cooking plane in a two-dimensional grid, the inductors being fed respectively by control blocks controlled respectively by periodic control signals.
  • This induction hob includes a control unit adapted to implement the control method described above.
  • the periodic control signals are adapted to control power switches integrated in the control units of the inductors.
  • This hob has characteristics and advantages similar to those described above in relation to the control method according to the invention.
  • This hob includes several inductors I1, I2, ... In placed under a hob, to allow induction heating in a conventional manner of a container placed on the hob.
  • inductors 11, I2, ... In are arranged under the cooking plane, and distributed in a two-dimensional grid to cover a large area of the hob.
  • a typical number of inductors can thus be between 30 and 40.
  • the inductors 11, 12, ... ln are generally of low power and distributed for example in a matrix arrangement or in lines arranged staggered with respect to each other.
  • hob also called matrix induction hob
  • the invention is not limited to this type of hob, also called matrix induction hob, and can be applied to hobs having predetermined foci, each hearth being itself constituted one or more adjacent inductors.
  • Each inductor 11, 12, ... In is fed respectively by control blocks B1, B2, ... Bn.
  • control blocks B1, B2,... Bn do not need to be described in detail here and are conventionally constituted by electronic power switches, for example switches of the IGBT type (acronym for the English term). Saxon Insulated Gate Bipolar Transistor).
  • control blocks associated with the inductors may be a half-bridge structure or a quasi-resonant architecture.
  • control blocks B1, B2,... Bn are respectively controlled by periodic control signals S1, S2,... Sn.
  • Each inductor 11, 12, ... In can thus be controlled independently of the others thanks to the control blocks B1, B2 ... Bn.
  • the periodic control signals S1, S2,... Sn are signals which can be adjusted in frequency or in pulse width (PWM signals, acronym for the English term Pulse With Modulation or PWM signals, acronym in French of term Pulse Width Modulation), in order to modify the current flowing in the inductors 11, 12, ... In and thus vary the power delivered by these inductors 11, 12, ... In to the containers covering them.
  • PWM signals acronym for the English term Pulse With Modulation
  • PWM signals acronym in French of term Pulse Width Modulation
  • the hob 10 also comprises a control unit C making it possible to manage, in particular, the start, stop, and frequency of the periodic control signals S1, S2, ... Sn.
  • a predefined periodic timing signal Sc is inputted to this control unit C.
  • the periodic timing signal Sc corresponds, in terms of periodicity, to the AC voltage signal Ss of the electrical supply network 12 of the hob 10.
  • the hob 10 comprises a synchronization circuit H adapted to generate a periodic square signal 0/1 from the sinusoidal AC voltage signal Ss of the power supply network 12.
  • control unit C can operate using this predefined periodic timing signal Sc, which consists of a periodic square signal that can take two binary values 1 or 0.
  • This method of controlling the periodic control signals S1, S2,... Sn is adapted to control in particular the starting, stopping, or modification of the periodic control signals S1, S2,... Sn.
  • the frequency of the periodic control signals S1, S2,... Sn is between 10 kHz and 100 kHz and is adapted to control the operation of electronic power switches of the IGBT type.
  • the predefined periodic timing signal Sc may have a frequency of between 20 and 100 Hz.
  • It can typically be equal to 50 Hz or 60 Hz, corresponding to the frequency of the sinusoidal signal Ss of AC voltage of a current power supply network.
  • the periodic control signals S1, S2, S3, S4, S5 have a period about 400 to 1600 times shorter than the period of the periodic timing signal Sc.
  • This control method further comprises a synchronization step periodically implemented at a predetermined time of the periodic timing signal Sc.
  • this predetermined instant t1, t2, t3, t4 occurs periodically, at each period T1, T2, T3, T4 of the periodic timing signal Sc.
  • this predetermined instant t1, t2, t3, t4 corresponds to the passage through 0 in the increasing direction of this sinusoidal signal Ss, which also corresponds to a rising edge, that is to say from the value 0 to the value 1, of the periodic clock signal Sc of square form.
  • the predetermined instant t1, t2, t3, t4 could correspond to the passage by 0 in the decreasing direction of the sinusoidal signal Ss of alternating voltage, corresponding then to a falling edge, that is, that is, from the value 1 to the value 0, of the periodic clocking signal Sc of square form.
  • the second periodic control signal S2 is not active during the first two periods T1, T2 of the periodic timing signal Sc.
  • this second periodic control signal S2 is carried out during the synchronization step, at the predetermined time t3, corresponding to the beginning of the third period T3 of the periodic timing signal Sc .
  • this start ensures the execution of a complete cycle of this second periodic control signal S2 on this third period T3.
  • the activation of an additional inductor may be due either to the operation of an additional cooking zone, or during the power control of a cooking hearth already in operation, which causes periodic stops of operation of one or more inductors associated with this cooking hearth.
  • the activation of an additional inductor may also be due to the displacement of a container on the cooktop, thus displacing the cooking chamber during operation and thus modifying the activated inductors.
  • a periodic control signal such as, for example, the first periodic control signal S1
  • this first periodic control signal S1 is stopped and restarted during the synchronization step implemented at the predetermined time t3 of the next period T3, succeeding the second period T2 of the periodic timing signal Sc.
  • each synchronization step implemented at each predetermined time t2, t3, t4 when a signal is maintained in operation on the different periods T1, T2, T3, T4 of the periodic timing signal Sc.
  • the periodic control signals S1, S2, S3 are thus reset at each predetermined instant t2, t3, t4 of each period T2, T3, T4 of the periodic timing signal Sc.
  • this brief delay can have a duration of approximately 100 ⁇ s.
  • the duration of this brief delay depends in particular on the speed of the control unit C as well as the number of inductors 11, 12 ... In which are controlled.
  • each periodic control signal S1, S2, S3 is repeated identically on each period T1, T2, T3, T4 of the periodic timing signal Sc.
  • the periodic control signals S2, S3 as illustrated in the example of the figure 4 are stopped at the predetermined time t4, corresponding to the beginning of the fourth period T4 of the periodic timing signal Sc, during the synchronization step implemented at this time t4.
  • the periodic control signals S1, S2, S3 also have the particularity of having an identical frequency.
  • the periodic control signals S1, S2, S3 are synchronous at all times during the control of the corresponding inductors 11, 12, 13 of the hob 10.
  • the periodic control signals S4, S5 are reset, that is to say are stopped and restarted at each predetermined time t2, t3, t4 of each period T2, T3, T4 of the periodic timing signal Sc.
  • the value of the phase shift d changes during the same period T1, T2, T3, T4 of the periodic timing signal Sc.
  • phase shift d between the periodic control signals S4, S5, taken at the same predetermined time of each period T1, T2, T3, T4 of the periodic timing signal Sc, remains constant from one period to the other of the signal periodic timing Sc.
  • phase of the periodic control signals S4, S5 is controlled throughout the control of the corresponding inductors 14, 15.
  • each periodic control signal S4, S5 is thus repeated identically from one period to another of the periodic timing signal Sc.
  • phase maintenance of the synchronous signals or of an identical phase shift at a given instant of each period of the periodic timing signal Sc) makes it possible to ensure the stability of the power consumed by the inductors 11, 12, ... In, by limiting the impact of the coupling between inductors on the fluctuations of the power consumed by each inductor.
  • This control method thus makes it possible to have a better management of the power delivered to each container and thus a better overall control of the delivered power which must be enslaved to a desired power demanded by the user.
  • the predefined periodic timing signal Sc may be arbitrary and not deduced from the sinusoidal signal Ss of alternating voltage of the power supply network 12.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • General Induction Heating (AREA)
EP11185828A 2010-10-21 2011-10-19 Verfahren zur Kontrolle von regelmäßigen Steuersignalen, insbesondere für ein Induktionskochfeld Withdrawn EP2445308A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1004137A FR2966691B1 (fr) 2010-10-21 2010-10-21 Procede de controle de signaux de commande periodiques, notamment pour une table de cuisson a induction.

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EP2445308A1 true EP2445308A1 (de) 2012-04-25

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EP11185823.9A Active EP2445307B1 (de) 2010-10-21 2011-10-19 Verfahren zur Kontrolle von periodischen Steuersignalen, insbesondere für ein Induktionskochfeld
EP11185828A Withdrawn EP2445308A1 (de) 2010-10-21 2011-10-19 Verfahren zur Kontrolle von regelmäßigen Steuersignalen, insbesondere für ein Induktionskochfeld

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EP (2) EP2445307B1 (de)
ES (1) ES2616206T3 (de)
FR (1) FR2966691B1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2716422A1 (es) * 2017-11-08 2019-06-12 Bsh Electrodomesticos Espana Sa Dispositivo de aparato de cocción por inducción.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2863039A1 (fr) 2003-11-27 2005-06-03 Brandt Ind Procede de chauffage d'un recipient pose sur une table de cuisson a moyens de chauffage associe a des inducteurs
EP2034800A1 (de) 2007-08-07 2009-03-11 BSH Bosch und Siemens Hausgeräte GmbH Kochvorrichtungsschaltung
WO2010069616A1 (de) * 2008-12-19 2010-06-24 BSH Bosch und Siemens Hausgeräte GmbH Kochfeld mit wenigstens drei heizzonen
EP2214454A1 (de) * 2009-01-28 2010-08-04 BSH Bosch und Siemens Hausgeräte GmbH Induktionskochfeld mit mehreren Induktoren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2863039A1 (fr) 2003-11-27 2005-06-03 Brandt Ind Procede de chauffage d'un recipient pose sur une table de cuisson a moyens de chauffage associe a des inducteurs
EP2034800A1 (de) 2007-08-07 2009-03-11 BSH Bosch und Siemens Hausgeräte GmbH Kochvorrichtungsschaltung
WO2010069616A1 (de) * 2008-12-19 2010-06-24 BSH Bosch und Siemens Hausgeräte GmbH Kochfeld mit wenigstens drei heizzonen
EP2214454A1 (de) * 2009-01-28 2010-08-04 BSH Bosch und Siemens Hausgeräte GmbH Induktionskochfeld mit mehreren Induktoren

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ES2616206T3 (es) 2017-06-09
EP2445307B1 (de) 2016-12-07
FR2966691B1 (fr) 2016-12-30
FR2966691A1 (fr) 2012-04-27
EP2445307A1 (de) 2012-04-25

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