EP3863372B1 - Procédé de commande d'un dispositif chauffant d'une plaque de cuisson et plaque de cuisson - Google Patents

Procédé de commande d'un dispositif chauffant d'une plaque de cuisson et plaque de cuisson Download PDF

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Publication number
EP3863372B1
EP3863372B1 EP21153208.0A EP21153208A EP3863372B1 EP 3863372 B1 EP3863372 B1 EP 3863372B1 EP 21153208 A EP21153208 A EP 21153208A EP 3863372 B1 EP3863372 B1 EP 3863372B1
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EP
European Patent Office
Prior art keywords
heating device
radiation heating
hob
time
temperature limiter
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.)
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Application number
EP21153208.0A
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German (de)
English (en)
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EP3863372A1 (fr
Inventor
Christian Egenter
Marcus Frank
Matthias Mangler
Jochen Rickert
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.)
EGO Elektro Geratebau GmbH
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EGO Elektro Geratebau GmbH
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Publication of EP3863372A1 publication Critical patent/EP3863372A1/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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H05B1/0266—Cooktops
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • 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
    • H05B2213/04—Heating plates with overheat protection means

Definitions

  • the invention relates to a method for controlling a heating device of a hob or a cooking appliance and a corresponding hob or cooking appliance.
  • the hob has a radiant heating device as a heating device, a hob plate above it and a safety temperature limiter between the two.
  • a safety temperature limiter is designed as a thermomechanical functional device in order to deactivate the radiant heating device when the temperature is too high or a switch-off temperature is reached. This serves in particular to protect the hob plate from damage caused by excessive temperatures due to the heating output of the radiant heating device.
  • Such safety temperature limiters are known from the prior art, for example from EP 1 569 257 A1 .
  • a method for controlling a heating device of a hob is known, which should be able to detect abnormal temperature increases and then react appropriately to them.
  • a temperature-sensitive device is provided as a resistance temperature sensor made of platinum, with which the temperature above the heating device and under a hob plate can be recorded.
  • a second similar temperature-sensitive device is also provided. If an unusual, particularly rapid, increase in temperature is detected at the temperature-sensitive devices, heating output can be reduced.
  • the invention is based on the object of creating a method mentioned at the beginning and a hob or cooking device mentioned at the beginning, with which problems of the prior art can be solved and in particular it is possible to make such a hob or its radiant heating device advantageous, diverse and practical to use, in particular to ensure safe operation of the hob.
  • the safety temperature limiter is advantageously attached to the radiant heating device or the latter has the safety temperature limiter, so that they can both form a prefabricated structural unit.
  • the safety temperature limiter is particularly advantageously arranged in an upper region of the radiant heating device, so that it runs at least with an elongated temperature detection element or a temperature detection device between the radiant heating device or its heating conductors and the hob plate. This is the effective range of the radiant heating device or its heating conductors upwards through the hob plate into a cooking vessel placed on it.
  • the hob can also have other conventional switching devices, in particular as a power supply for the radiant heating device. These options are explained in more detail below.
  • the safety temperature limiter is designed to switch off or deactivate the radiant heating device when a predetermined switch-off temperature is reached.
  • the preceding step for the method is that a cooking vessel is placed on the hob plate above the radiant heating device, in particular where a so-called cooking area is formed by the radiant heating device.
  • This hob is to be heated using the radiant heating device, for which this is activated.
  • the power supply to the radiant heating device for example through relays or electromechanical switches, is advantageously used for this activation.
  • an initial switch-on time is recorded or this begins to run, advantageously in a type of timer of a hob control.
  • This initial switch-on time is the time or duration for which the radiant heating device is operated or activated for the first time after the hob is switched on, in particular at least when the hob plate is cool or has cooled down after previous operation.
  • the radiant heating device is then activated or supplied with power and heats the cooking vessel that has been set up.
  • the safety temperature limiter or at least its aforementioned temperature detection device is also heated up, so that the temperature recorded by it also increases.
  • the aforementioned switch-off temperature is reached at the safety temperature limiter, which results in the radiant heating device being deactivated by the safety temperature limiter. In particular, this deactivation can take place through a direct switching process.
  • the initial switch-on time is stopped or its end is determined and it is recorded. The initial switch-on time therefore indicates the duration between the first activation and deactivation of the radiant heating device.
  • the recorded initial switch-on time is compared with a predefined limit switch-on time.
  • the power with which the radiant heating device is activated and operated or is operated during activation is reduced. A reduction can occur to varying degrees, as will be explained in more detail below.
  • heating is carried out at the full set power during the first heating cycle of the radiant heating device or during its first activation, but no longer afterwards.
  • the radiant heating device is connected directly to a supply voltage or to a mains voltage and either works at full power in the connected state or is deactivated, the radiant heating device is activated at its full or maximum power during this initial switch-on time.
  • Their output can then be reduced either in a very simple case by deactivating the radiant heating device for a certain time in the case mentioned that the initial switch-on time is below the limit switch-on time, i.e. the heating has taken place too quickly, which is longer than the time actually intended for the set operation or clocked operation when switched off.
  • the entire hob is advantageously not switched off, since it can be assumed that there is no fatal or serious malfunction, but only a case of a possibly too high temperature or dangerously high temperature on this cooking vessel to be heated above the radiant heating device.
  • Such deactivation of the radiant heating device or reduction of its power can be selected or predetermined, for example, for a period of 1 minute to 5 minutes.
  • a reduction in the power of the radiant heating device is visually and/or acoustically indicated to an operator in the case mentioned. In this way, an operator can be made aware of the possible danger involved and the cause of the reduction in performance.
  • an operator can reactivate the operation of the radiant heating device as intended by operating a control element.
  • this necessarily conscious action shows that the operator is present and can therefore quickly recognize a dangerous situation and react accordingly.
  • such very rapid heating may be desired, and if the operator is aware of this, a possible risk of an uncontrollable situation is also reduced or eliminated.
  • the safety temperature limiter is advantageously arranged on the radiant heating device. It particularly advantageously has a temperature detection device, which can be designed as a thermomechanical temperature detection device. It can consist of two materials with different coefficients of thermal expansion, which leads to relative movement when heated. This temperature detection device acts on a switch to deactivate the radiant heating device by switching the switch, preferably due to the said relative movement. In particular, this switch can be looped directly into a power supply for the radiant heating device.
  • the safety temperature limiter is advantageously arranged in the vicinity of electrical connections to the radiant heating device, so that connection is simplified.
  • An example of such a radiant heating device is from the DE 42 29 375 A1 known, to which explicit reference is hereby made.
  • a limit power can be an area output of more than 5 W/cm 2 , in particular more than 7 W/cm 2 , alternatively more than 70% of a maximum area output. In the case of a conventional hob, for example, these would be area outputs from a power level 7. The method can thus be limited to checking cases in which the danger mentioned at the beginning actually exists due to relatively high or very high power of the radiant heating device.
  • the initial switch-on time will probably be significantly longer than the predefined limit switch-on time.
  • the switch-on time would not be undercut. The procedure would therefore not intervene as a safety function because the case mentioned does not occur.
  • a necessary or maximum area performance also depends on an adjustment of the safety temperature limiter. This means that the higher the adjustment, the higher the area performance is, otherwise the safety temperature limiter cannot switch quickly enough to detect and prevent an error. This can preferably also apply the other way around, the higher the area performance should be, the higher the adjustment should be.
  • the predefined limit switch-on time it is possible for the predefined limit switch-on time to be adjustable. It can therefore not only be preset at the factory, but can also possibly be changed by an operator. For this purpose, it can be provided that it can only be set in a separate setting mode on the hob.
  • the safety function itself, it should be provided that it is always activated, at least from the aforementioned relatively high powers for the radiant heating device, and therefore cannot be deactivated. This ensures the desired safety function.
  • a certain cooling time which can advantageously be predefined, after reducing the power on the radiant heating device or deactivating it, the previously set power is at least partially restored, in particular completely restored.
  • a cooling time can be between 2 minutes and 5 minutes. This ensures that the cooking vessel is heated again to at least a certain temperature, which at the same time can be viewed as non-critical. So it doesn't cool down completely again.
  • the security function is activated again. So if the radiant heating device is activated again after the cooling time has elapsed the initial switch-on time should again start running again, and if it is again below the limit switch-on time, i.e. the safety temperature limiter should deactivate the radiant heating device again relatively quickly, the power with which the radiant heating device is activated should be reduced again or switched off . In this way, any further risk can be ruled out.
  • the switching behavior of the safety temperature limiter it is possible for the switching behavior of the safety temperature limiter to be monitored throughout the entire operation of the radiant heating device, in particular by a hob control.
  • a time of less than 90 seconds, in particular less than 60 seconds, elapses between the safety temperature limiter being triggered twice in succession it can be concluded that the cooking vessel heated by the radiant heating device is boiling empty.
  • a similar safety function is then also achieved during the continuous heating of the cooking vessel, i.e. not just at the beginning. If it is concluded that the cooking vessel is boiling empty or that the cooking vessel is being heated too quickly, the power for this radiant heating device is reduced again, as explained at the beginning, and in particular it is deactivated. Such deactivation or reduction of power should take place at least for the aforementioned cooling down time.
  • a ratio of an active time of the operation of the radiant heating device to the sum of this active time and a deactive time during which the radiant heating device is not operated in a control device or the hob control. This can also be done in connection with a power level set for the radiant heating device.
  • the control device or hob control can also monitor and store the power generated by the radiant heating device over time, so that this is known.
  • the aforementioned ratio of an active time to the sum of active time and deactivation time for an energy controller with which the radiant heating device is supplied with power is greater than the corresponding ratio for the safety temperature limiter.
  • the safety temperature limiter switches or switches off for the first time in front of the energy regulator. This can be important for detecting the switching process on the safety temperature limiter.
  • Such an energy regulator is, for example, from DE 36 39 186 A1 known, to which explicit reference is made in this regard.
  • a switching state of the safety temperature limiter which is connected to an aforementioned energy regulator for power supply, is detected for the radiant heating device is connected in series, only takes place on this energy controller. Since such an energy regulator is usually arranged away from the radiant heating device and close to other control devices or the other energy regulators, an electrical connection is easier here. Based on the current flow through the energy controller, the switching state on the safety temperature limiter can then be deduced, since when current flows, the safety temperature limiter must be switched on and the radiant heating device must therefore be activated.
  • the switching state of the energy regulator can be detected and the switching state of the safety temperature limiter can also be detected. Then the current flow does not have to be monitored directly. This is possible by detecting a voltage across the radiant heating device, since current only flows through the radiant heating device or a voltage lies above it when the safety temperature limiter is closed.
  • the safety temperature limiter activates and deactivates the radiant heating device. If, after a time of more than 5 minutes and/or after deactivating the radiant heating device more than ten times by the safety temperature limiter, it is determined that the period of time for activating the radiant heating device is shortened, in particular shortened by at least 10% to 50%, this means that The usual switching pattern or clock pattern of the safety temperature limiter has changed.
  • the power setting for the radiant heating device has not been changed, shortening the activation time can only mean that the cooking vessel now becomes significantly hotter compared to before or can no longer absorb as much heat. This is very often the case when the cooking vessel is boiled empty. If such empty boiling of the cooking vessel is detected or evaluated as detected, the power with which the radiant heating device is activated and operated is reduced or it is deactivated as described above in the event that heating up too quickly is detected at the beginning.
  • an electronic control device of the hob can have switching elements as a hob control, preferably relays or power semiconductors, with which the radiant heating device is activated or deactivated.
  • Such activation or deactivation of the radiant heating device is advantageously carried out by connecting it to a mains voltage, in particular directly to the mains voltage, or completely Disconnect from the mains voltage.
  • a mains voltage in particular directly to the mains voltage, or completely Disconnect from the mains voltage.
  • There is no intermediate conversion of a supply voltage for the radiant heating device as is known, for example, for induction heating devices. Relays here are understood to mean other switching devices such as those in the aforementioned energy regulator.
  • Such an energy controller is a thermally controlled electromechanical switching device, which does not require or contain any so-called intelligence.
  • a specific cycle ratio for the radiant heating device is set on the energy controller and thus its long-term generated power.
  • the hob then has an additional control to record the switching state of the safety temperature limiter, record the initial switch-on time and carry out the procedure.
  • a single additional control is provided for all hotplates or all radiant heating devices and electromechanical control devices of the hob. This additional control then has appropriate recording means for the time and, for example, a microcontroller.
  • a switching state of the safety temperature limiter it is possible for a switching state of the safety temperature limiter to be detected by at least one of the options mentioned below.
  • a voltage across the radiant heating device can be measured.
  • a corresponding voltage measurement can be contained, for example, in an aforementioned electronic control device or an additional control.
  • a current that flows through the radiant heating device can be measured.
  • a corresponding current measuring device can also be included in the aforementioned electronic control device or additional control.
  • a current can be measured that flows in parallel to a series connection of a safety temperature limiter and a radiant heating device, advantageously in front of an energy regulator or switching means towards the mains connection.
  • This option is also advantageously integrated directly into an electronic control device or additional control.
  • a mains power supply can advantageously be provided for the hob, which has a connection to a so-called neutral conductor of a power network.
  • a so-called neutral conductor of a power network For all radiant heating devices, either a single common isolating relay can be provided in this connection to the neutral conductor. Alternatively, each radiant heating device can have its own isolating relay on the neutral conductor. This means that, for example as a safety function, either an individual radiant heating device or the entire hob can be switched off using the cut-off relay.
  • a hob 11 according to the invention is shown in section with a hob plate 12.
  • a hob 14 is formed thereon, on which a cookware 13, here a pan, is placed.
  • the hotplate 14 is essentially defined by a radiant heating device 16 of the usual type arranged under the hob plate, for example according to the one mentioned above DE 42 29 375 A1 .
  • the radiant heating device 16 has a metal receiving shell 17, within which a type of thick thermal insulation 18 is arranged, which is electrically insulating.
  • a heating conductor 20 is laid on the top, which glows in the visible range when operated with mains voltage and thus generates radiant heat. This goes up through the hob plate into the bottom of the cookware 13.
  • a rod controller 23 is arranged on the radiant heating device 16 as a safety temperature limiter according to the invention.
  • the rod controller 23 is in Fig. 2 shown in enlargement and has a housing 25, from which an elongated sensor 27 extends, according to Fig. 1 over the entire surface of the heating conductor 20 or between this or the radiant heating device 16 and the hob plate 12.
  • the rod controller 23 with the elongated sensor 27 as the aforementioned temperature detection element detects the temperature near the underside of the hob plate 12, which usually consists of glass ceramic.
  • this rod regulator 23 thus protects the hob plate 12 from excessive heating or excessive temperatures, as this could otherwise be mechanically damaged. Due to the properties of the glass ceramic material often used for this purpose, an excessive increase in electrical conductivity could otherwise occur, which the safety regulations do not allow.
  • the elongated sensor 27 has a sensor tube 28 made of metal, in particular made of steel.
  • An elongated rod 29 made of ceramic material runs in the sensor tube 28 and strikes the inside of the end of the sensor tube 28 with its one free end.
  • the metallic sensor tube 28 expands and thus becomes longer, while the rod 29 is made of ceramic, which does not expand.
  • the rod 29, pushed away by a coil spring in the housing 25 moves slightly with its other end. This other end rests on a switch 31, which is designed here as a simple switching spring, but in practice is advantageously designed as a so-called snap spring, see also the aforementioned prior art.
  • the rod 29 no longer presses against the switch 31 so strongly that the two switching contacts still touch each other, but rather they open. Then there is no longer any current flow between the switch connection 33 on the left and the counter connection 34 on the right, with which it is switched into the current flow to the radiant heating device 16 is.
  • the rod controller 23 is therefore open and thus interrupts the current flow to the radiant heating device 16, whereby it is deactivated as described at the beginning.
  • the temperature at which the switch 31 is opened can be precisely adjusted with such a rod regulator 23 and can therefore, for example, be set according to the invention so that the hob plate 12 of the hob 11 does not become too hot due to the aforementioned aspects.
  • Fig. 3 is the time course for the average temperature T on the cookware 13, namely on its base, as well as the power of the radiant heating device 16 shown during a heating or a cooking process according to the prior art.
  • a power supply for the radiant heating device 16 is set here so that it should work at maximum power and thus the power supply itself does not switch off the radiant heating device 16 at all.
  • the radiant heating device is deactivated or the clocking is done solely with the rod controller 23.
  • the temperature T would be so high in the long term at around 460 ° C that, as explained at the beginning, either the cookware 13 would be damaged by warping or but small amounts of oil or fat could ignite.
  • a possible situation may be that an operator has placed the cookware 13 with some fat in it on the hotplate 14, set the radiant heater 16 to maximum power and started operation. Then the operator may have left the room. Based on Fig.
  • the radiant heating device 16 is reduced in its output, namely completely switched off here.
  • the temperature T rises slightly further to a value of slightly above 300 ° C, which is not critical, and then falls again.
  • the aforementioned signaling should be given to an operator, which can be visual and/or acoustic, drawing attention to this shutdown.
  • the power of the radiant heating device could also be reduced, for example halved, whereby the aforementioned critical temperatures are also no longer reached. In any case, it is safer to deactivate the radiant heating device, which can be reversed by an operator through appropriate operation or actuation of a control element. Then the operator must be present and can recognize and eliminate a dangerous situation.
  • a simplified circuit for a hob 11 is shown in order to operate four radiant heating devices or their heating conductors 20 shown.
  • the circuit is connected to two phases L1 and L2 as well as a neutral conductor of a power network.
  • Two current paths to the heating conductors 20 are provided for the conductors L1 and L2, with an aforementioned energy regulator 42 being connected in each current path, which determines the level of continuous power of the heating conductors 20.
  • rod controllers 23 are provided for each heating conductor 20.
  • An additional control 36 is provided, since in such a hob, apart from the energy regulators 42, no switches are or need to be provided, and normally no control or control intelligence whatsoever.
  • the additional control 36 has a microcontroller 38 and an isolating relay 40 of the heating conductor 20 to the neutral conductor N.
  • the energy regulators 42 and the rod regulators 23 work, so to speak, autonomously, the energy regulators 42 as they are set by an operator. This will be explained below. As explained above, the rod controllers 23 work with the switch-off temperatures adjusted for them at the factory, and also independently.
  • the microcontroller 38 is connected to the current paths in front of and behind the rod controllers 23; a connection can also be designed differently. As a result, as will be explained below, the switching state or the current flow is recorded.
  • the microcontroller 38 thus knows when the rod controller 23 switches off or deactivates the radiant heating device 16 or the heating conductor 20, so it can detect the initial switch-on time in the manner described above. It thus records the duration from the first switching on or activation of the radiant heating device 16 with the heating conductors 20 until they are first switched off or deactivated. This recorded initial switch-on time is then stored in the microcontroller 38 Limit switch-on time compared, as explained previously. If it is below this, the output of the radiant heating device, which has heated up too quickly, so to speak, must be reduced.
  • the additional control 36 or the microcontroller 38 cannot directly control the energy controller 42 for the corresponding radiant heating device, nor can they control the rod controller 23, and otherwise only a single isolating relay 41 is provided in the current path to each radiant heating device 16 the additional control 36 only opens the isolating relay 40. This means that not only the relevant radiant heating device 16 is switched off, but all radiant heating devices 16 are switched off. However, there is no other way to do this here, and the safety function is guaranteed in any case. Alternatively, an isolation relay for the neutral conductor could also be provided separately for each of the radiant heating devices 16 or their heating conductors 20. However, the effort would then be considerably higher.
  • the isolating relay 40 does not necessarily have to be installed in the additional control 36; it can be an isolating relay that may already be present with an additional connection to the additional control 36.
  • the energy regulator 42 has a device switch 43, which is designed as a so-called snap switch.
  • a non-round cam disk 45 sits on a rotary shaft 44, which can be rotated by an operator using a control knob.
  • a projection 48 of a support lever 47 rests on its outer edge in a spring-loaded manner, whereby an adjusting device 49 for the device switch 43 is formed.
  • the device switch 43 is attached to the support lever 47. It has a snap spring 51 with a switching contact 52 at the left end. The switching contact 52 is connected to a mating contact 53, so the energy regulator 42 conducts current because the device switch 43 is closed.
  • a switching element 55 made of a bimetal is provided, which presses on the right free end of the snap spring 51.
  • a heating element 56 is provided above this, which is heated when the device switch 43 is closed.
  • the switching element 55 bends clockwise, i.e. with the right free end downwards, and thus presses on the right free end of the switching spring 51.
  • the snap spring 51 snaps and opens the device switch 43, so the current flow is interrupted .
  • the heating element 56 is then no longer heated and cools down again, as does the switching element 55, which bends back again and thus enables the device switch 43 to be closed again. This is how timing is achieved.
  • the respective durations can be adjusted by turning the cam 45 using the rotating shaft 44.
  • This is an electromechanical or electro-thermomechanical power setting for a radiant heating device 16.
  • a microcontroller 38 is provided alone without an energy regulator or the like, so the corresponding hob has its own intelligence.
  • the microcontroller 38 is supplied with information by operating elements, for example conventional touch switches, for example a power setting by an operator, which in the aforementioned example was done via the energy regulator 42.
  • the hob control 35 with the microcontroller 38 has a relay 57 in order to also operate the heating conductor 20 of the radiant heating device 16 in a clocking manner, similar to that shown in FIG Fig. 3 and 4 is shown and how the energy regulator 42 does.
  • the relay 57 is connected to the microcontroller 38 and thus replaces an energy regulator.
  • an isolating relay 40 is provided towards the neutral conductor N, for example a single isolating relay for all radiant heating devices 16.
  • a voltage measurement using a voltmeter 58 is provided here. This is connected in parallel to the heating conductor 20. If the relay 57 is closed and a voltage is detected on the voltmeter 58, the rod regulator 23 must also be closed. If the relay 57 is closed, but the voltage measuring device 58 does not detect any voltage on the heating conductor 20, the rod controller 23 has opened or the heating conductor 20 has been deactivated. In this way, the initial switch-on time can be recorded and then, as before Fig. 5 explained, the microcontroller 38 can carry out the comparison with a stored predetermined limit switch-on time. The further measures correspond to those explained above.
  • FIG. 8 An alternative embodiment of the hob control 35 is shown with an ammeter 60, which is looped into the current path to the heating conductor 20 behind the relay 57 and thus still within the hob control 35.
  • the current measuring device 60 can only detect a current flow if both the relay 57 of the microcontroller 38 is closed and the rod controller 23 is closed. When the relay 57 is closed, interrupting the current flow necessarily means that if the isolating relay 40 is also closed, the rod regulator 23 has opened.
  • the first deactivation of the heating conductor 20 or the radiant heating device 16 after the initial switch-on time can also be detected by the rod controller 23.
  • an ammeter 60 is provided from the connection of the relay 57 to the phase L to the connection of the heating conductor 20 to the isolating relay 40. If relay 57 and isolating relay 40 are closed, it can also be determined by monitoring the current flow whether the rod controller 23 is closed or open. The microcontroller 38 can also record the initial switch-on time or its duration.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Food Science & Technology (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)

Claims (15)

  1. Procédé de commande d'un dispositif de chauffage (16) d'une table de cuisson (11), la table de cuisson (11) présentant:
    - au moins un dispositif de chauffage par rayonnement (16) comme dispositif de chauffage,
    - une plaque de cuisson (12) sous laquelle est disposé le dispositif de chauffage par rayonnement (16),
    - un limiteur de température de sécurité (23), qui est conçu comme un dispositif fonctionnel thermomécanique et qui est disposé entre le dispositif de chauffage par rayonnement (16) et la plaque de cuisson (12), le limiteur de température de sécurité (23) étant conçu pour désactiver le dispositif de chauffage par rayonnement (16) lorsqu'une température de coupure est atteinte,
    comprenant les étapes suivantes:
    - mise en place d'un récipient de cuisson (13) sur la plaque de cuisson (12) au-dessus du dispositif de chauffage par rayonnement (16),
    - activation du dispositif de chauffage par rayonnement (16) et début simultané de la détection d'un temps d'activation initial,
    - détection d'une désactivation du dispositif de chauffage par rayonnement (16) par le limiteur de température de sécurité (23) lorsqu'une température de coupure est atteinte au niveau du limiteur de température de sécurité (23) et détection du temps de première mise en marche qui s'est écoulé jusqu'alors entre l'activation et la désactivation du dispositif de chauffage par rayonnement (16),
    - comparaison du premier temps d'activation détecté avec un temps d'activation limite prédéfini, dans le cas où le premier temps d'activation est inférieur au temps d'activation limite, la puissance avec laquelle le dispositif de chauffage par rayonnement (16) est activé et fonctionne est réduite.
  2. Procédé selon la revendication 1, caractérisé en ce que, dans le cas où le temps de mise en marche initial est inférieur au temps de mise en marche limite, le dispositif de chauffage par rayonnement (16) est désactivé, de préférence sans que toute la table de cuisson (11) ne soit éteinte.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que le dispositif de chauffage par rayonnement (16) est désactivé ou sa puissance est réduite uniquement lorsqu'une puissance avec laquelle le dispositif de chauffage par rayonnement (16) doit être activé est supérieure à une puissance limite prédéfinie, de préférence avec une puissance surfacique supérieure à 5 W/cm2, notamment supérieure à 7 W/cm2.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'après un temps de refroidissement déterminé, qui est de préférence prédéfini, après réduction de la puissance sur le dispositif de chauffage par rayonnement (16) ou désactivation de celui-ci, la puissance précédemment réglée est au moins partiellement rétablie, ce temps de refroidissement étant de préférence compris entre 2 min et 5 min.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que, pendant tout le fonctionnement du dispositif de chauffage par rayonnement (16), le comportement de commutation du limiteur de température de sécurité (23) est surveillé, dans le cas où, entre deux réponses successives du limiteur de température de sécurité (23), s'écoule un temps inférieur à 90 sec, en particulier moins de 60 sec, on conclut à une cuisson à vide du récipient de cuisson (13) chauffé par le dispositif de chauffage par rayonnement (16) et on réduit ensuite la puissance pour ce dispositif de chauffage par rayonnement (16), en particulier on désactive ce dispositif de chauffage par rayonnement (16).
  6. Procédé selon la revendication 4 ou 5, caractérisé en ce qu'un rapport entre un temps actif et la somme d'un temps actif et d'un temps désactivé pour le dispositif de chauffage par rayonnement (16) est mémorisé dans un dispositif de commande (38), en particulier en relation avec un niveau de puissance réglé, le dispositif de commande (38) surveillant et enregistrant de préférence également la puissance générée par le dispositif de chauffage par rayonnement (16) pendant le temps.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'une détection d'un état de commutation et d'un flux de courant n'est effectuée que sur un régulateur d'énergie (42) pour l'alimentation en puissance du dispositif de chauffage par rayonnement (16).
  8. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'une détection d'un état de commutation est effectuée sur un régulateur d'énergie (42) pour l'alimentation en puissance du dispositif de chauffage par rayonnement (16) et est effectuée en outre sur le limiteur de température de sécurité (23).
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un état de commutation du limiteur de température de sécurité (23) est détecté par au moins une des possibilités suivantes:
    - mesure d'une tension aux bornes du dispositif de chauffage par rayonnement (16),
    - mesure d'un courant qui circule à travers le dispositif de chauffage par rayonnement (16),
    - mesure d'un courant circulant en parallèle avec une connexion en série du limiteur de température de sécurité (23) et du dispositif de chauffage par rayonnement (16).
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que, pendant toute une opération de cuisson avec le récipient de cuisson (13) sur la plaque de cuisson (12), on détecte, par l'intermédiaire du dispositif de chauffage par rayonnement (16), quand le limiteur de température de sécurité (23) active et désactive le dispositif de chauffage par rayonnement (16), pour obtenir, après un temps de plus de 5 minutes et/ou après plus de dix désactivations du dispositif de chauffage par rayonnement (16) par le limiteur de température de sécurité (23), une réduction de la durée d'activation du dispositif de chauffage par rayonnement (16), en particulier une réduction d'au moins 10 % à 50 % de la durée, est considérée comme une cuisson à vide du récipient de cuisson (13) et, par la suite, la puissance avec laquelle le dispositif de chauffage par rayonnement (16) est activé et fonctionne est réduite ou le dispositif de chauffage par rayonnement (16) est désactivé.
  11. Table de cuisson (11) configurée pour mettre en oeuvre le procédé selon l'une des revendications précédentes, la table de cuisson (11) comprenant:
    - un dispositif de chauffage par rayonnement (16),
    - une plaque de cuisson (12) sous laquelle est placé le dispositif de chauffage par rayonnement (16),
    - un limiteur de température de sécurité (23), qui est conçu comme un dispositif fonctionnel thermomécanique et qui est disposé entre le dispositif de chauffage par rayonnement (16) et la plaque de cuisson (12), le limiteur de température de sécurité (23) étant conçu pour désactiver le dispositif de chauffage par rayonnement (16),
    caractérisé en ce que le dispositif de chauffage par rayonnement (16) comprend le limiteur de température de sécurité (23), de préférence dans sa partie supérieure ou entre un conducteur chauffant (20) du dispositif de chauffage par rayonnement (16) et la plaque de cuisson (12).
  12. Table de cuisson selon la revendication 11, caractérisée en ce qu'elle comporte un dispositif de commande électronique (38), en particulier avec des interrupteurs tactiles en tant qu'éléments de commande, le dispositif de commande (38) activant ou désactivant le dispositif de chauffage par rayonnement (16) par l'intermédiaire d'éléments de commutation, en particulier par l'intermédiaire de relais (40, 41, 57) ou de demi-conducteurs de puissance, en particulier en le raccordant à une tension de réseau ou en le déconnectant complètement de la tension de réseau.
  13. Table de cuisson selon la revendication 12, caractérisée en ce qu'un réglage de la puissance pour le dispositif de chauffage par rayonnement (16) est effectué au moyen d'un dispositif de commande électromécanique (38), la table de cuisson (11) présentant une commande supplémentaire (36) pour détecter l'état de commutation du limiteur de température de sécurité (23), une seule commande supplémentaire (36) étant de préférence prévue pour tous les foyers (14) ou dispositifs de chauffage par rayonnement (16) de la table de cuisson (11).
  14. Table de cuisson selon l'une des revendications 11 à 13, caractérisée en ce qu'elle comporte une alimentation électrique sur secteur avec un raccordement à un neutre (N), un seul relais de coupure (40) commun étant prévu dans le raccordement au neutre pour tous les dispositifs de chauffage radiants (16), ou un relais de coupure propre à chaque dispositif de chauffage radiant (16) étant prévu dans le raccordement au neutre (N).
  15. Table de cuisson selon l'une des revendications 11 à 14, caractérisée en ce que le limiteur de température de sécurité (23) est disposé sur le dispositif de chauffage par rayonnement (16), le limiteur de température de sécurité (23) présentant un dispositif de détection de température (27), en particulier un dispositif de détection de température (27) de conception thermomécanique, qui agit sur un interrupteur (31) pour désactiver le dispositif de chauffage par rayonnement (16) afin de le commuter, le limiteur de température de sécurité étant en particulier conçu comme un régulateur à tige (23).
EP21153208.0A 2020-02-10 2021-01-25 Procédé de commande d'un dispositif chauffant d'une plaque de cuisson et plaque de cuisson Active EP3863372B1 (fr)

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Citations (1)

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EP2472999B1 (fr) * 2010-12-29 2016-03-16 BSH Hausgeräte GmbH Champ de cuisson et procédé de commande de l'apport énergétique sur un élément de chauffe d'un champ de cuisson

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Publication number Priority date Publication date Assignee Title
DE3639186A1 (de) * 1986-11-15 1988-05-26 Ego Elektro Blanc & Fischer Elektro-schaltgeraet, insbesondere zur leistungssteuerung
FR2652172B1 (fr) * 1989-09-15 1996-06-28 Europ Equip Menager Dispositif et procede de regulation d'appareil de cuisson.
DE4229375C2 (de) * 1992-09-03 2000-05-04 Ego Elektro Blanc & Fischer Strahlungs-Heizkörper
GB2325533B (en) * 1997-05-22 2001-08-08 Ceramaspeed Ltd Method and apparatus for controlling an electric heater
DE10129170A1 (de) * 2001-06-12 2002-12-19 Ego Elektro Geraetebau Gmbh Verfahren zur Steuerung der Leistung einer elektrischen Heizeinrichtung
GB0313831D0 (en) * 2003-06-16 2003-07-23 Ceramaspeed Ltd Apparatus and method for detecting abnormal temperature rise associated with a cooking arrangement
EP1569257B1 (fr) * 2004-02-24 2006-07-12 Electrovac, Fabrikation elektrotechnischer Spezialartikel Gesellschaft m.b.H. Capteur de température
EP1922961B1 (fr) * 2005-09-10 2009-12-02 Crastal Technology (Shenzhen) Co., Ltd. Procede de commande pour empecher une bouilloire de bouillir a vide
DE102008014268A1 (de) * 2008-03-04 2009-09-17 E.G.O. Elektro-Gerätebau GmbH Verfahren und Vorrichtung zur Steuerung eines Kochfeldes
DE102009060125A1 (de) * 2009-12-17 2011-06-22 E.G.O. Elektro-Gerätebau GmbH, 75038 Elektronische Steuerung für ein Kochgerät und Steuerverfahren

Patent Citations (1)

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EP2472999B1 (fr) * 2010-12-29 2016-03-16 BSH Hausgeräte GmbH Champ de cuisson et procédé de commande de l'apport énergétique sur un élément de chauffe d'un champ de cuisson

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PL3863372T3 (pl) 2024-03-25
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ES2966343T3 (es) 2024-04-22

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